JP6572444B2 - vending machine - Google Patents

Description

  The present invention relates to a vending machine that sells products such as canned beverages heated or cooled using a refrigerant circuit (heat pump).

  In recent years, there has been an increasing demand for power consumption reduction for vending machines, and as a means for reducing power consumption, there is one that uses a waste heat generated by cooling or heat of the outside air to heat a storage room in which products are stored. It has been proposed (see, for example, Patent Document 1 and Patent Document 2).

  Hereinafter, conventional vending machines disclosed in Patent Document 1 and Patent Document 2 will be described with reference to the drawings.

  FIG. 19 is a refrigerant circuit diagram of a conventional vending machine, FIG. 20 is a refrigerant circuit diagram showing a refrigerant flow path during cooling operation for cooling all the rooms in the conventional vending machine, and FIG. Refrigerant circuit showing a refrigerant flow path in the case of flowing a refrigerant through the external evaporator during a cooling and heating operation in which the cooling chamber of 1 is heated by the condenser in the cabinet and the second cooling greenhouse and the cooling exclusive chamber are cooled. 22 and 22 show that the first cooling greenhouse in the conventional vending machine is heated by the condenser inside the cabinet and the second cooling greenhouse and the cooling exclusive chamber are cooled to the outside evaporator during the cooling and heating operation. FIG. 23 is a refrigerant circuit diagram showing a refrigerant flow path when no refrigerant is flown, and FIG. 23 shows a refrigerant flow path during a heating operation in which the first cooling greenhouse in the conventional vending machine is heated by the internal condenser. A circuit diagram is shown.

  A conventional vending machine has a product storage 1 for storing products and a machine room (not shown) arranged in the lower part of the product storage 1.

  The product storage 1 has a first cooling greenhouse 2 that cools or warms the stored product, a second cooling greenhouse 3 that cools or warms the stored product, and cools the stored product. It is partitioned into a cooling chamber 4. In addition, in each product storage room, a product storage shelf (not shown) is suspended at the top, and the products are stored inside.

  In the machine room, the compressor 5, the outside condenser 40 that condenses the refrigerant discharged from the compressor 5, the outside evaporator 41, and the outside condenser 40 are located on the windward side and the outside evaporator. An outside fan that is located in the vicinity of the outside condenser 40 and the outside evaporator 41 so that 41 is on the leeward side and blows air so that heat exchange between the outside condenser 40 or the outside evaporator 41 is promoted. 26 is arranged.

  In the first cooling greenhouse 2, the refrigerant condensed in the outside condenser 40 is evaporated to cool the products in the first cooling greenhouse 2 and discharged from the compressor 5. The inside condenser 46 for condensing the refrigerant to heat the product in the first cooling greenhouse 2, and the inside evaporator 47 and the inside condenser 46 are arranged in the vicinity of the inside evaporator 47 or Separately from the internal fan 27 for circulating the air heat-exchanged with the internal condenser 46 in the first cooling chamber 2 and the products in the first cooling chamber 2 as required separately from the internal condenser 46 A warming heater 30 that is energized to generate heat when warming and a temperature sensor (not shown) that detects the indoor temperature of the first cooling greenhouse 2 are arranged.

In the second cooling greenhouse 3, the refrigerant condensed by the external condenser 40 (condensed by the internal condenser 46 and the external condenser 40 when the refrigerant is flowing in the internal condenser 46) is stored. The internal evaporator 9 that cools the product in the second cooling greenhouse 3 by evaporating, and the air that is disposed in the vicinity of the internal evaporator 9 and exchanges heat with the internal evaporator 9 is subjected to the second cooling and heating. The internal fan 28 that circulates in the greenhouse 3, the heating heater 31 that is energized to heat the product in the second cooling greenhouse 3, and the indoor temperature of the second cooling greenhouse 3 A temperature sensor (not shown) for detection is arranged.

  In the cooling exclusive chamber 4, the refrigerant condensed by the external condenser 40 (condensed by the internal condenser 46 and the external condenser 40 when the refrigerant is flowing in the internal condenser 46) is evaporated. The internal evaporator 10 that cools the product in the cooling exclusive chamber 4 and the internal fan that is disposed in the vicinity of the internal evaporator 10 and circulates the air exchanged with the internal evaporator 10 in the exclusive cooling chamber 4. 29 and a temperature sensor (not shown) for detecting the room temperature of the cooling-only chamber 4 are arranged.

  The first cooling chamber 2 is cooled at a branch point where the refrigerant flow path branches to the internal evaporator 47 side and the internal evaporators 9 and 10 side and the internal evaporator 47. Therefore, when the refrigerant flows through the internal evaporator 47, it is open, and since the cooling of the first cooling greenhouse 2 is not required, it is closed when the refrigerant does not flow through the internal evaporator 47. An electromagnetic valve 51 is provided as a branch flow path opening / closing means.

  In addition, at the branching point where the refrigerant flow path branches into the internal evaporator 9 side and the internal evaporator 10 side, the refrigerant flow path toward the internal evaporator 9 and the refrigerant flow toward the internal evaporator 10 are provided. A three-way valve 42 is provided as a branch channel opening / closing means capable of switching the channel or closing both channels simultaneously.

  The refrigerant flow path between the electromagnetic valve 51 and the internal evaporator 47 is provided with an expansion mechanism 43 that depressurizes the refrigerant flowing through the internal evaporator 47, and is provided between the three-way valve 42 and the internal evaporator 9. The refrigerant flow path is provided with an expansion mechanism 44 for reducing the pressure of the refrigerant flowing into the internal evaporator 9. The refrigerant flow path between the three-way valve 42 and the internal evaporator 10 is connected to the internal passage from the three-way valve 42. An expansion mechanism 45 for reducing the pressure of the refrigerant flowing in the direction of the evaporator 10 is provided.

  The refrigerant outlet side of the internal evaporator 9 is connected to a refrigerant pipe connecting the expansion mechanism 45 and the internal evaporator 10, and the refrigerant that has flowed out of the internal evaporator 9 enters the internal evaporator 10. It is configured to flow in.

  The refrigerant pipe on the discharge side of the compressor 5 causes the refrigerant discharged from the compressor 5 to pass through the internal condenser 46 when the product in the first cooling greenhouse 2 is heated by the internal condenser 46. Then, the refrigerant discharged from the compressor 5 when flowing into the external condenser 40 and not warming the product in the first cooling greenhouse 2 is not passed through the internal condenser 46 to the external condenser 40. A four-way switching valve 49 is provided as a flow path switching means for the internal condenser to flow.

  An expansion mechanism 48 for reducing the pressure of the refrigerant condensed in the internal condenser 46 is provided in the refrigerant pipe between the refrigerant outlet side of the internal condenser 46 of the first cooling greenhouse 2 and the four-way switching valve 49. .

  In the machine room, the outside evaporator 41 includes a refrigerant outlet of the outside condenser 40, and a branch point that branches the refrigerant flow path to the inside evaporator 47 side and the inside evaporators 9 and 10 side. It is provided in the bypass flow path which bypasses the refrigerant | coolant piping (refrigerant piping of the exit side of the refrigerant | coolant of the condenser 40 outside a warehouse) and the suction side piping of the compressor 5 between.

  An electromagnetic valve 52 as a bypass channel opening / closing means for opening and closing the bypass channel is provided on the refrigerant inlet side of the external evaporator 41 (the refrigerant inlet side of the bypass channel).

  In addition, in the bypass flow path between the electromagnetic valve 52 and the external evaporator 41, a bypass flow path expansion that decompresses the refrigerant condensed in the internal condenser 46 and the external condenser 40 and flowing into the bypass flow path. An expansion mechanism 53 is provided as a means.

The electromagnetic valve 52 as the bypass flow path opening / closing means is opened only when the refrigerant discharged from the compressor 5 flows to the outside condenser 40 via the inside condenser 46.

  A refrigerant pipe between a confluence point where a branch flow path on the refrigerant outlet side of the internal evaporator 47 and a branch flow path on the refrigerant outlet side of the internal evaporator 10 merge and the suction side of the compressor 5; A refrigerant pipe between the expansion mechanism 48 for reducing the pressure of the refrigerant condensed by the internal condenser 46 and the four-way switching valve 49 is connected via an electromagnetic valve 50.

  Each of the outside condenser 40 and the outside evaporator 41 is a heat exchanger in which piping passes through a plurality of fins arranged in parallel and spaced apart from each other and end plates arranged on both sides of the fins. Yes, the end plate for the external condenser 40 and the end plate for the external evaporator 41 are connected, but the fin through which the pipe for the external condenser 40 passes and the pipe for the external evaporator 41 are connected. It is not connected to the penetrating fin.

  That is, the external condenser 40 and the external evaporator 41 are two-pass heat exchangers that are integrated so that the fins are separate and share the end plate, and when the external fan 26 is operated, It arrange | positions so that piping for the outer condenser 40 may be on the leeward side, and piping for the outside evaporator 41 may be on the leeward side.

  The piping for the outside condenser 40 and the piping for the outside evaporator 41 are each configured such that the refrigerant flows in the piping from the top to the bottom.

  Here, in a general vending machine, the second cooling greenhouse 3 is often the narrowest room, and the internal evaporator 9 installed in the second cooling greenhouse 3 It is smaller than the internal evaporator 47 installed in the first cooling greenhouse 2 and the internal evaporator 9 installed in the cooling chamber 4.

  Therefore, in order to ensure the evaporation capability of the internal evaporator 9 alone, it is necessary to enlarge the expansion mechanism 44 to greatly lower the evaporation temperature, which reduces the efficiency of the compressor 5 and reduces the power consumption. Will increase.

  Therefore, by connecting the refrigerant outlet of the internal evaporator 9 and the refrigerant inlet of the internal evaporator 10 so that the internal evaporator 9 and the internal evaporator 10 can be handled as one large evaporator. The evaporating temperature is raised to increase the efficiency and reduce the power consumption.

  The operation of the conventional vending machine configured as described above will be described below.

  First, in the case of a cooling operation for cooling all of the first cooling greenhouse 2, the second cooling greenhouse 3, and the cooling exclusive chamber 4, the refrigerant flows in the direction of the arrow in the thick refrigerant path of FIG. It becomes driving.

  In the all-chamber cooling operation, the four-way switching valve 49 is connected to the discharge pipe of the compressor 5 and the external condenser 40, and the refrigerant inlet of the internal condenser 46 and the refrigerant of the internal condenser 46 are connected. The outlet communicates with the closed loop, and the three-way valve 42 opens the flow path to the expansion mechanism 44 for the internal evaporator 9 and closes the flow path to the expansion mechanism 45 for the internal evaporator 10. The solenoid valve 51 is opened, the solenoid valve 52 is closed, and the compressor 5 is started.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the four-way switching valve 49 and is cooled and condensed by the external condenser 40, and then is divided into the three-way valve 42 side and the electromagnetic valve 51 side. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

  The liquid refrigerant flowing from the three-way valve 42 toward the expansion mechanism 44 is reduced in pressure by the expansion mechanism 44 and then evaporated and evaporated in the internal evaporator 9 to cool the second cooling greenhouse 3. When the refrigerant is flowing through the internal evaporator 9, the internal fan 28 blows air to the internal evaporator 9.

  The excess liquid refrigerant that could not be evaporated by the internal evaporator 9 is evaporated by the internal evaporator 10 connected in series with the internal evaporator 9 to cool the cooling exclusive chamber 4 (series cooling operation). . When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  Thereafter, when the temperature of the second cooling greenhouse 3 reaches the target temperature (the lower limit value of the cooling temperature range), the three-way valve 42 is switched so that the refrigerant flows from the three-way valve 42 to the expansion mechanism 45, Of the internal evaporator 9 and the internal evaporator 10, only the internal evaporator 10 is cooled alone (downstream independent cooling operation).

  By performing the serial cooling operation preferentially in this way, the cooling exclusive chamber 4 is also cooled by the surplus liquid refrigerant, so that the operating rate of the downstream side single cooling operation can be reduced and the power consumption can be reduced. Can do.

  On the other hand, the liquid refrigerant that has flowed from the solenoid valve 51 to the expansion mechanism 43 side is decompressed by the expansion mechanism 43 and then evaporated and evaporated by the internal evaporator 47 to cool the first cooling greenhouse 2. When the refrigerant is flowing through the internal evaporator 47, the internal fan 27 blows air to the internal evaporator 47.

  The gaseous refrigerant that has flowed out of the internal evaporator 10 and the gaseous refrigerant that has flowed out of the internal evaporator 47 join together and return to the compressor 5.

  And a control means (not shown) maintains the temperature in each room | chamber interior of the 1st cooling greenhouse 2, the 2nd cooling greenhouse 3, and the cooling exclusive room 4 within the preset cooling temperature range. The switching of the three-way valve 42, the opening and closing of the electromagnetic valve 51, and the operation of the compressor 5, the external fan 26, and the internal fans 27, 28, 29 are controlled.

  For example, when the first cooling greenhouse 2 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the electromagnetic valve 51 is closed and the internal fan 27 is stopped. And when the temperature in the 1st cooling greenhouse 2 rises to the predetermined temperature used as the upper limit of a cooling temperature range in the state which the solenoid valve 51 has obstruct | occluded, while opening the solenoid valve 51, the internal fan 27 is made to open. drive.

  If the outlet of both refrigerants of the three-way valve 42 is closed when the first cooling chamber 2 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the electromagnetic valve 51 is closed. If the compressor 5 and the internal fan 27 are stopped, and the temperature in the first cooling greenhouse 2 rises to a predetermined temperature that is the upper limit value of the cooling temperature range while the compressor 5 is stopped, the solenoid valve 51 is opened. At the same time, the compressor 5 is started and the internal fan 27 is operated.

  Further, when the second cooling chamber 3 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the three-way valve is brought into a state in which the flow path to the expansion mechanism 44 is closed and the flow path to the expansion mechanism 45 is opened. 42 is switched and the internal fan 28 is stopped. If the temperature in the second cooling greenhouse 3 rises to a predetermined temperature that is the upper limit value of the cooling temperature range while the compressor 5 is stopped, the flow path to the expansion mechanism 44 is opened and the expansion mechanism 45 is connected. The three-way valve 42 is switched to a state in which the flow path is closed, the compressor 5 is started, and the internal fan 28 is operated.

Further, the three-way valve 42 closes the flow path to the expansion mechanism 44 and opens the flow path to the expansion mechanism 45 so that only the internal evaporator 10 out of the internal evaporator 9 and the internal evaporator 10 is cooled alone. When the temperature in the second cooling greenhouse 3 rises to a predetermined temperature that is the upper limit value of the cooling temperature range in the state where the downstream single cooling operation is performed, the flow path to the expansion mechanism 44 is opened. The internal fan 28 is operated by switching the three-way valve 42 to a state in which the flow path to the expansion mechanism 45 is closed.

  In addition, after the transition from the series cooling operation of the internal evaporator 9 and the internal evaporator 10 to the downstream single cooling operation of only the internal evaporator 10, the predetermined temperature at which the cooling exclusive chamber 4 becomes the lower limit value of the cooling temperature range If the solenoid valve 51 is in an open state when it is cooled down, the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 is closed to stop the internal fan 29, and if the solenoid valve 51 is in a closed state, In addition to closing the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 and stopping the internal fan 29, the compressor 5 also stops.

  If the temperature in the cooling chamber 4 rises to a predetermined temperature that is the upper limit value of the cooling temperature range while the compressor 5 is stopped, the flow path to the expansion mechanism 44 is opened and the flow path to the expansion mechanism 45 is opened. The three-way valve 42 is switched to the closed state, the compressor 5 is started, and the internal fan 29 is operated.

  Further, when both the refrigerant outlets of the three-way valve 42 are closed, the electromagnetic valve 51 is open, and the compressor 5 is in operation, the temperature in the cooling chamber 4 reaches a predetermined temperature at which the upper limit of the cooling temperature range is reached. If it rises, the three-way valve 42 is switched to a state where the flow path to the expansion mechanism 44 is opened, and the internal fan 29 is operated.

  When the compressor 5 is started, the three-way valve 42 opens the flow path to the expansion mechanism 44 and closes the flow path to the expansion mechanism 45 in advance, opens the electromagnetic valve 51, and closes the electromagnetic valve 52. To do.

  And when the compressor 5 is stopped, in order to balance the high and low pressure of the refrigerant circuit, when opening the refrigerant outlet on the expansion mechanism 44 side or the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42, The refrigerant outlet of the internal condenser 46 and the suction side (suction side) piping of the compressor 5 are communicated with each other.

  Then, after the high and low pressures of the refrigerant circuit are balanced, the refrigerant outlet of the three-way valve 42 is closed.

  As a result, excess refrigerant can be stored in the internal condenser 46 that is not used in the cooling operation while the compressor 5 is stopped, so that it is possible to prevent an excessive amount of refrigerant during the cooling operation. Further, by always opening the electromagnetic valve 50, it is possible to prevent the refrigerant from being continuously stored in the internal condenser 46 due to the leakage of the refrigerant through the four-way switching valve 49 and falling into a refrigerant shortage state.

  When the first cooling greenhouse 2 is switched from the heating operation to the cooling operation or at the initial pull-down at a high outside air temperature, when the inside temperature is high and a large refrigerating capacity is required, the compression is performed. Regardless of whether the machine 5 is operated or stopped, the solenoid valve 50 is always opened so that the refrigerant outlet of the internal condenser 46 and the suction side (suction side) pipe of the compressor 5 communicate with each other. Therefore, a large refrigeration capacity can be obtained and the pull-down time can be shortened.

  Next, in the case of the cooling and heating operation in which the first cooling greenhouse 2 is heated and the second cooling greenhouse 3 and the cooling exclusive chamber 4 are cooled, the first cooling greenhouse 2 will be roughly described. Until the internal chamber temperature reaches a predetermined internal upper limit temperature (heating end temperature) or until the discharge pressure of the compressor 5 reaches the predetermined compressor overload pressure, the solenoid valve 52 of the bypass flow path is opened. The refrigerant flows in the direction of the arrow through the thick refrigerant passage in FIG.

  Thereafter, if the discharge pressure of the compressor 5 reaches a predetermined compressor overload pressure, the solenoid valve 52 of the bypass flow path is closed, and the refrigerant passes through the thick refrigerant path of the arrow in FIG. Make it flow in the direction.

  After the discharge pressure of the compressor 5 has reached a predetermined compressor overload pressure, the electromagnetic valve 52 in the bypass flow path is closed, and then the predetermined compressor whose discharge pressure of the compressor 5 is lower than the compressor overload pressure. When the pressure is reduced to the normal pressure (reopen pressure), the solenoid valve 52 of the bypass flow path is opened so that the refrigerant flows again in the direction of the arrow in the thick refrigerant path of FIG.

  More specifically, when starting the cooling and heating operation for heating the first cooling greenhouse 2 and cooling the second cooling greenhouse 3 and the cooling exclusive chamber 4, as shown in FIG. The switching valve 49 is in a state where the discharge pipe of the compressor 5 communicates with the refrigerant inlet of the internal condenser 46, and the refrigerant outlet of the internal condenser 46 communicates with the external condenser 40. The three-way valve 42 opens the flow path to the expansion mechanism 44 and closes the flow path to the expansion mechanism 45, closes the electromagnetic valve 51, opens the electromagnetic valve 52, and starts the compressor 5.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the four-way switching valve 49 and then travels to the internal condenser 46 and is partially condensed by the internal condenser 46. The inside of the first cooling greenhouse 2 is heated by releasing heat to the air around the condenser 46. When the refrigerant is flowing through the internal condenser 46, the internal fan 27 blows air to the internal condenser 46.

  The refrigerant exiting the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the four-way switching valve 49, and is further condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

  The refrigerant that has flowed out of the external condenser 40 flows from the three-way valve 42 to the expansion mechanism 44 side for the internal evaporator 9, and the refrigerant that branches to the bypass flow path and flows from the electromagnetic valve 52 to the expansion mechanism 53 side. Divided into

  The refrigerant that has flowed from the three-way valve 42 toward the expansion mechanism 44 for the internal evaporator 9 is decompressed by the expansion mechanism 44 and then evaporated and evaporated in the internal evaporator 9 to cool the second cooling greenhouse 3. . When the refrigerant is flowing through the internal evaporator 9, the internal fan 28 blows air to the internal evaporator 9.

  The excess liquid refrigerant that could not be evaporated by the internal evaporator 9 is evaporated by the internal evaporator 10 connected in series with the internal evaporator 9 to cool the cooling exclusive chamber 4 (series cooling operation). When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  Thereafter, when the temperature of the second cooling greenhouse 3 reaches the target temperature (the lower limit value of the cooling temperature range), the three-way valve 42 is switched so that the refrigerant flows into the expansion mechanism 45 for the internal evaporator 10. Thus, only the internal evaporator 10 out of the internal evaporator 9 and the internal evaporator 10 is cooled alone (downstream single cooling operation).

  By performing the serial cooling operation preferentially in this way, the cooling exclusive chamber 4 is also cooled by the surplus liquid refrigerant, so that the operating rate of the downstream side single cooling operation can be reduced and the power consumption can be reduced. Can do.

  On the other hand, the refrigerant branched into the bypass flow path and flowing from the electromagnetic valve 52 to the expansion mechanism 53 side is evaporated by the external evaporator 41 after being decompressed by the expansion mechanism 53.

  Then, the gaseous refrigerant that has flowed out of the internal evaporator 10 and the gaseous refrigerant that has flowed out of the external evaporator 41 merge and return to the compressor 5.

  Thereafter, if the discharge pressure of the compressor 5 reaches a predetermined compressor overload pressure, the control means (not shown) closes the electromagnetic valve 52 in the bypass flow path.

  Here, examples of the discharge pressure detection means of the compressor 5 include a pressure sensor that is provided on the discharge pipe and directly measures the pressure of the refrigerant, a thermistor provided on the discharge pipe, and the like.

  However, the discharge pressure of the compressor 5 can be approximated by the piping temperature in the vicinity of the heat exchanger in the form of the condensation temperature, and in a state where the temperature is high such as the condensation temperature, the temperature change due to the pressure loss does not occur. Since it is very small (about 1 to 2 ° C.), it can be realized at low cost by detecting the temperature on the pipe in the vicinity of the internal condenser 46 with a thermistor or the like.

  When the solenoid valve 52 in the bypass channel is closed, the coolant flows in the direction of the arrow through the thick coolant channel in FIG.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the four-way switching valve 49 and then travels to the internal condenser 46 and is partially condensed by the internal condenser 46. The inside of the first cooling greenhouse 2 is heated by releasing heat to the air around the condenser 46. When the refrigerant is flowing through the internal condenser 46, the internal fan 27 blows air to the internal condenser 46.

  The refrigerant exiting the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the four-way switching valve 49, and is further condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

  The refrigerant flowing out of the external condenser 40 flows from the three-way valve 42 to the expansion mechanism 44 side for the internal evaporator 9 because the solenoid valve 52 in the bypass flow path is closed. After being depressurized, the second cooling greenhouse 3 is cooled by evaporating with the internal evaporator 9. When the refrigerant is flowing through the internal evaporator 9, the internal fan 28 blows air to the internal evaporator 9.

  The excess liquid refrigerant that could not be evaporated by the internal evaporator 9 is evaporated by the internal evaporator 10 connected in series with the internal evaporator 9 to cool the cooling exclusive chamber 4 (series cooling operation). When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  Thereafter, when the temperature of the second cooling greenhouse 3 reaches the target temperature (the lower limit value of the cooling temperature range), the three-way valve 42 is switched so that the refrigerant flows into the expansion mechanism 45 for the internal evaporator 10. Thus, only the internal evaporator 10 out of the internal evaporator 9 and the internal evaporator 10 is cooled alone (downstream single cooling operation).

  By performing the serial cooling operation preferentially in this way, the cooling exclusive chamber 4 is also cooled by the surplus liquid refrigerant, so that the operating rate of the downstream side single cooling operation can be reduced and the power consumption can be reduced. Can do.

  The gaseous refrigerant that has flowed out of the internal evaporator 10 returns to the compressor 5.

  If the discharge pressure of the compressor 5 drops to a predetermined compressor normal pressure (reopen pressure) lower than the compressor overload pressure after the solenoid valve 52 of the bypass passage is closed, the bypass passage The electromagnetic valve 52 is opened so that the refrigerant flows in the direction of the arrow in the refrigerant flow path indicated by the thick line in FIG.

  When the electromagnetic valve 52 of the bypass channel is opened, the heating capacity of the internal condenser 46 can be increased as compared with the case where the electromagnetic valve 52 is closed.

When the solenoid valve 52 of the bypass flow path is opened, the refrigerant flows through the bypass flow path, so that the flow resistance of the refrigerant decreases, the circulation amount of the refrigerant increases, the evaporation temperature of the internal evaporators 9 and 10 increases, The condensation temperature of the condenser 46 increases. Therefore, the heating capability by the internal condenser 46 of the 1st cooling heating greenhouse 2 increases, and it can heat by the heat pump heating (heating by a cooling heating system) more efficient than the heating heater 30. .

  And a control means (not shown) maintains the room temperature of the 1st cooling heating chamber 2 in the preset heating temperature range, and each room | chamber interior of the 2nd cooling heating chamber 3 and the cooling exclusive room 4 is carried out. The switching of the four-way switching valve 49 and the three-way valve 42 and the operation of the compressor 5, the external fan 26, and the internal fans 27, 28, and 29 are controlled so that the temperature of the compressor is maintained within a preset cooling temperature range. doing.

  For example, when the first cooling greenhouse 2 is heated to a predetermined temperature (heating end temperature) that is the upper limit value of the heating temperature range, the flow of the three-way valve 42 to the expansion mechanism 44 for the internal evaporator 9 is performed. Either the passage (exit) or the flow path (exit) to the expansion mechanism 45 for the internal evaporator 10 is in an open state (the internal cooling 9 and the internal evaporator 10 cool the second cooling chamber 3 and Downstream side for cooling the cooling exclusive chamber 4 during the serial cooling operation for cooling both the product storage chambers of the exclusive chamber 4 or by the independent cooling of the internal evaporator 9 and the internal evaporator 10 alone. If the single cooling operation is in progress), the electromagnetic valve 52 in the bypass passage is closed and the internal fan 27 is stopped.

  Alternatively, in addition to closing the electromagnetic valve 52 and stopping the internal fan 27, the four-way switching valve 49 is connected to the discharge pipe of the compressor 5 and the external condenser 40, and the refrigerant of the internal condenser 46 is communicated. The inlet and the refrigerant outlet of the internal condenser 46 communicate with each other to form a closed loop.

  Here, the electromagnetic valve 52 in the bypass flow path is closed and the internal fan 27 is stopped. However, the four-way switching valve 49 is connected to the discharge pipe of the compressor 5 and the external condenser 40, and the internal condensation is performed. In the case where the refrigerant inlet of the condenser 46 and the refrigerant outlet of the internal condenser 46 are not communicated to form a closed loop, the inside of the first cooling greenhouse 2 is closed by the closure of the electromagnetic valve 52 of the bypass flow path. By reducing the heating capacity of the condenser 46 and stopping the internal fan 27, the amount of heat exchange between the air in the first cooling greenhouse 2 and the internal condenser 46 decreases.

  In this case, most of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 cannot be condensed by the internal condenser 46 but is condensed by the external condenser 40. When it is necessary to sufficiently condense in the outside condenser 40, the amount of heat exchange between the outside condenser 40 and the outside air is increased by increasing the amount of air blown by the outside fan 26.

  Then, after closing the electromagnetic valve 52 of the bypass channel and stopping the internal fan 27, if the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range, the electromagnetic wave is again generated. The valve 52 is opened and the internal fan 27 is operated.

  If the four-way switching valve 49 is switched so that the refrigerant from the compressor 5 does not flow into the internal condenser 46, the temperature of the first cooling greenhouse 2 reaches a predetermined temperature at which the lower limit of the heating temperature range is reached. If it falls, in addition to opening of the solenoid valve 52 and the operation of the internal fan 27, the four-way switching valve 49 is again connected to the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46, and The refrigerant outlet of the inner condenser 46 and the outside condenser 40 are returned to the communication state.

  Further, when the second cooling greenhouse 3 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the flow path (exit) to the expansion mechanism 44 for the internal evaporator 9 is closed to close the internal evaporator. The three-way valve 42 is switched to a state where the flow path (exit) to the expansion mechanism 45 for 10 is opened, and the internal fan 28 is stopped. Further, if the temperature in the second cooling greenhouse 3 rises to a predetermined temperature that is the upper limit value of the cooling temperature range while the compressor 5 is stopped, the flow path to the expansion mechanism 44 for the internal evaporator 9 ( The three-way valve 42 is switched to a state in which the outlet) is opened and the flow path (exit) to the expansion mechanism 45 is closed, the electromagnetic valve 52 in the bypass flow path is closed, the compressor 5 is started, and the internal fan 28 To drive.

  Further, the three-way valve 42 closes the flow path (exit) to the expansion mechanism 44 for the internal evaporator 9 and opens the flow path (exit) to the expansion mechanism 45 for the internal evaporator 10, The temperature in the second cooling greenhouse 3 is the upper limit of the cooling temperature range in a state where only the internal evaporator 10 of the evaporator 9 and the internal evaporator 10 is performing single cooling (downstream single cooling operation). When the temperature rises to a predetermined temperature, the flow path (exit) to the expansion mechanism 44 for the internal evaporator 9 is opened and the flow path (exit) to the expansion mechanism 45 for the internal evaporator 10 is closed. The three-way valve 42 is switched to the state and the internal fan 28 is operated.

  In addition, after the transition from the series cooling operation of the internal evaporator 9 and the internal evaporator 10 to the downstream single cooling operation of only the internal evaporator 10, the predetermined temperature at which the cooling exclusive chamber 4 becomes the lower limit value of the cooling temperature range The four-way switching valve 49 communicates with the discharge pipe of the compressor 5 and the external condenser 40, and the refrigerant inlet of the internal condenser 46 and the refrigerant outlet of the internal condenser 46 are If it is in a closed loop state (the heating of the first cooling greenhouse 2 is unnecessary and the refrigerant discharged from the compressor 5 does not flow into the internal condenser 46), the three-way valve 42 In addition to closing the refrigerant outlet on the expansion mechanism 45 side for the internal evaporator 10 and stopping the internal fan 29, the compressor 5 is stopped.

  In addition, after the transition from the series cooling operation of the internal evaporator 9 and the internal evaporator 10 to the downstream single cooling operation of only the internal evaporator 10, the predetermined temperature at which the cooling exclusive chamber 4 becomes the lower limit value of the cooling temperature range The four-way switching valve 49 communicates with the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46, and the refrigerant outlet of the internal condenser 46 and the external condenser 40 Is in a state where the first cooling chamber 2 is heated and the refrigerant discharged from the compressor 5 is flowing into the internal condenser 46, the internal evaporation of the three-way valve 42 In addition to closing the outlet of the refrigerant on the expansion mechanism 45 side of the container 10 and stopping the internal fan 29, the electromagnetic valve 52 of the bypass flow path is opened to the state shown in FIG. The heating of the first cooling greenhouse 2 by 46 is continued.

  The heating heater 30 is an auxiliary device for heating at a very low temperature at which heat pump operation cannot be performed, or when a heating load such as an initial pull-up is large. Designed and controlled for good heat pump heating.

  Next, in the case of the heating operation in which only the first cooling greenhouse 2 is heated, the operation is such that the refrigerant flows in the direction indicated by the arrow through the thick refrigerant passage in FIG.

  In the case of the heating operation in which only the first cooling greenhouse 2 is heated, the four-way switching valve 49 communicates with the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46, and the inside The refrigerant outlet of the condenser 46 and the external condenser 40 are in communication with each other, the electromagnetic valve 51 is closed so that the refrigerant does not flow into the expansion mechanism 43 for the internal evaporator 47, and the three-way valve 42 All the flow paths (outlets) of the flow path (exit) to the expansion mechanism 44 for the internal evaporator 9 and the flow path (exit) to the expansion mechanism 45 for the internal evaporator 10 are closed, and the bypass flow path The solenoid valve 52 is opened, the compressor 5 is started, and the external fan 26 and the internal fan 27 are operated.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the four-way switching valve 49 and then travels to the internal condenser 46 and is partially condensed by the internal condenser 46. The inside of the first cooling greenhouse 2 is heated by releasing heat to the air around the condenser 46. The refrigerant exiting the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the four-way switching valve 49, and is further condensed by the external condenser 40.

  The refrigerant flowing out of the external condenser 40 does not flow to the internal evaporators 9, 10, 47 because the two outlets of the three-way valve 42 and the electromagnetic valve 51 are closed and the electromagnetic valve 52 is opened. , Flows to the bypass channel side.

  Then, it passes through the electromagnetic valve 52 in the bypass flow path, is decompressed by the expansion mechanism 53, evaporates in the external evaporator 41, and returns to the compressor 5.

  And if the 1st cooling greenhouse 2 is heated to the predetermined temperature used as the upper limit of a heating temperature range, a control means (not shown) will be the compressor 5, the external fan 26, and an internal fan. When the compressor 5, the outside fan 26, and the inside fan 27 are stopped, the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range. (Not shown) operates the compressor 5, the external fan 26, and the internal fan 27.

  As described above, when the first cooling greenhouse 2 is heated, the electromagnetic valve 52 is opened and closed, and the flow path (exit) to the expansion mechanism 44 for the internal evaporator 9 of the three-way valve 42 and the interior The first cooling is performed by controlling the opening and closing of the flow path (exit) to the expansion mechanism 45 for the evaporator 10 and evaporating the refrigerant in either the internal evaporators 9 and 10 or the external evaporator 41. Since a heat source necessary for heating the heating chamber 2 can be selected from the internal evaporators 9 and 10 or the external evaporator 41, the load state of the second cooling greenhouse 3 and the cooling exclusive chamber 4 can be changed. Regardless, it is possible to continue the operation of the compressor 5 to heat the first cooling greenhouse 2 and to consume the heat pump heating operation even at a low outside temperature where the load on the cooling chamber decreases. Electric power consumption can be reduced.

  Further, an expansion mechanism 48 is provided on a pipe between the refrigerant outlet side of the internal condenser 46 and the external condenser 40 (between the refrigerant outlet side of the internal condenser 46 and the four-way switching valve 49). This makes it possible to make a difference between the internal condensation temperature and the external condensation temperature. Even when the condensation temperature or the condensation pressure of the external condenser 40 decreases in the low outside air, the internal condenser 46 has a high condensation temperature. Since the first cooling greenhouse 2 can be efficiently heated, a highly efficient heating operation can be performed even in an area where the outdoor temperature is low in winter.

  Further, an expansion mechanism 48 is provided on a pipe between the refrigerant outlet side of the internal condenser 46 and the external condenser 40 (between the refrigerant outlet side of the internal condenser 46 and the four-way switching valve 49). Since the refrigerant density is reduced, the amount of refrigerant can be reduced. By reducing the amount of refrigerant, it is possible to reduce the optimum refrigerant amount difference between the cooling and heating operation using two condensers and the cooling operation using one condenser, and when using a flammable refrigerant Can be used to reduce the risk of leakage.

  When a capillary tube is used for the expansion mechanism 48, the expansion mechanism and the internal condenser 46 and the four-way switching valve 49 can be combined, so that an expansion valve or the like is used. As a result, the amount of refrigerant can be further reduced. In addition, capillary tubes can be used for the expansion mechanisms 43, 44, 45, and 53.

  In addition, a condenser and an evaporator are separately arranged inside the chamber (first cooling greenhouse 2 that performs heat pump heating operation) and outside the chamber (machine room), so that each one heat exchanger is a condenser. Compared to the proper use as an evaporator, the solenoid valve provided on the pipe connecting the evaporator outlet and the compressor suction pipe can be eliminated, and the efficiency reduction due to pressure loss can be prevented. In addition, since it is possible to obtain optimum specifications for each of the condenser and the evaporator, it is possible to operate more efficiently.

  Furthermore, by switching the operation mode in the form of selecting the internal evaporators 9 and 10 or the external evaporator 41 on the downstream side of the external condenser 40, the inside of the internal storage can be performed in both the cooling and heating operation. The refrigerant condensed in the condenser 46 is condensed again in the external condenser 40, and the condenser piping volume is the same in the cooling and heating operation and the heating operation, so that the optimum refrigerant amount can be made the same. It becomes.

In the case of the heating operation, the refrigerant evaporates and cools the ambient air in the external evaporator 41 installed in the machine room at the lower part of the product storage, so that the ambient air is in a high humidity state. There is a risk of condensation or frost forming on the piping inside the outside evaporator 41, and the condensed water may drip from the machine room to the outside of the vending machine. Even in this case, the outside condenser 40 and the outside evaporator 41 Heat is exchanged between the external condenser 40 and the external evaporator 41 by adopting a pipe configuration in which the fin is used as an integrated heat exchanger and the heat is always radiated and condensed by the external condenser 40. As a result, the amount of heat that cools the ambient air can be reduced by the outside evaporator 41, and the condensed water is evaporated by warming the fins of the integrated heat exchanger by heat radiation from the outside condenser 40. Self-sales of condensed water It is possible to prevent the dropping of the refrigerator outside.

  At this time, the heat exchange between the external condenser 40 and the external evaporator 41 is further enhanced by arranging the piping of the external condenser 40 so that it is located on the windward side when the external fan 26 is operated. It is possible to suppress condensation.

  Furthermore, since the distance at which the condensed water drops through the fins by placing the inlet where the temperature decreases most in the external evaporator 41 at the upper part of the integrated heat exchanger, it is easy to evaporate during the dropping, It becomes more difficult to dripping. Furthermore, it is possible to further prevent dripping outside the vending machine by arranging a tray that receives the condensed water dripped at the bottom of the integrated heat exchanger.

  In the cooling operation in which the refrigerant does not pass through the internal condenser 46, the refrigerant leaks from the discharge pipe side of the compressor 5, which has a high pressure within the four-way switching valve 49, to the internal condenser 46 side, which is the low pressure side. This causes refrigerant and refrigeration oil to stay in the internal condenser 46, resulting in insufficient cooling capacity and failure of the compressor, but on the pipe connecting the internal condenser 46 and the low-pressure side pipe. An electromagnetic valve 50 is provided, and by opening the electromagnetic valve 50, the refrigerant and oil accumulated in the internal condenser 46 can be recovered to the suction pipe of the compressor 5 at a low pressure, and the cooling capacity is insufficient. A failure of the compressor 5 can be prevented.

  Further, by opening the electromagnetic valve 50, the pressure in the piping of the internal condenser 46 becomes the same as the suction pressure of the compressor 5. As a result, a high / low pressure difference in the four-way switching valve 49 can be ensured, and leakage of refrigerant in the four-way switching valve 49 can be prevented.

  Note that the amount of refrigerant leakage in the four-way switching valve 49 is very small in normal times, so that the same effect can be obtained even if the solenoid valve 50 is not always opened, but is regularly opened for a predetermined time during the start-up of the compressor 5. Can be obtained. As a result, the electric energy of the electromagnetic valve 50 can be suppressed to the minimum.

  Further, when there is an abnormality in the four-way switching valve 49 and the amount of leakage of the four-way switching valve 49 is larger than usual, and there is a control to change the opening time of the solenoid valve 50, the leakage amount increases. Can also be supported.

  The accumulated refrigerant was recovered by connecting the internal condenser 46 and the suction pipe of the compressor 5. However, the pipe to be connected may be anywhere as long as it is the same as the suction pressure of the compressor 5. However, it may be downstream of the expansion mechanisms 43, 44, 45, 53.

  However, if the connection is made in the product storage, the solenoid valve 50 is provided in the product storage, and space is required, so the product storage space may be reduced, and the product storage is cooled. In this case, since the solenoid valve 50 is energized to generate a heat load, the refrigerant can be most efficiently recovered by connecting it to the vicinity of the suction pipe of the compressor 5.

When the piping of the external condenser 40 is arranged in the lower part of the integrated heat exchanger and the piping of the external evaporator 41 is arranged in the upper part of the integrated heat exchanger, it is generated in the upper external evaporator 41. By evaporating the condensed water dripping along the fin in the vicinity of the lower external condenser 40, it is possible to prevent the condensed water from dripping.

  As for the compressor 5, the cooling load of the first cooling greenhouse 2, the second cooling greenhouse 3, the cooling exclusive chamber 4 or the heating load of the first cooling greenhouse 2 is large and is cooled to a predetermined temperature range. A variable capacity compressor can be used to increase the capacity when it takes time to heat.

  Similarly, as the outside fan 26 and the inside fans 27, 28, and 29, fans that can increase or decrease the amount of air flow as needed can be used.

  The operation and stop timings of the external fan 26 and the internal fans 27, 28, and 29 are the timing of the operation of the compressor 5 and the change in the state of the refrigerant flow in the corresponding heat exchanger, if necessary. When the combustible refrigerant is used, the outside fan 26 may be operated with a predetermined capacity when the compressor 5 is stopped.

JP2013-84073A JP 2006-89209 A

  In the conventional vending machine, when the first cooling greenhouse 2 is heated, the first cooling is performed by evaporating the refrigerant in any of the internal evaporators 9 and 10 and the external evaporator 41. The heat source necessary for heating the heating chamber 2 is selected from the internal evaporators 9 and 10 or the external evaporator 41, regardless of the load state of the second cooling greenhouse 3 or the cooling exclusive chamber 4, It is possible to continue the operation of the compressor 5 to heat the first cooling greenhouse 2 and reduce the power consumption by performing the heat pump heating operation even at a low outside temperature where the load on the cooling chamber decreases. However, when the first cooling greenhouse 2 is heated at a low outside air temperature at which the load on the cooling chamber decreases, it may not be possible to cope with the heat pump heating operation. Further reduction of power consumption has been desired.

  An object of the present invention is to further increase the heat pump heating capability at a low outside air temperature at which the load on the cooling chamber decreases and further reduce the amount of power consumption by the heat pump heating operation.

In order to achieve the above object, a vending machine according to the present invention includes a compressor, an external condenser for condensing the refrigerant discharged from the compressor, and the external condenser installed in a plurality of product storage rooms. Between the internal evaporator that evaporates the refrigerant condensed in the product and cools the product in the product storage chamber, the branch point that branches the refrigerant flow path to the multiple internal evaporators, and the multiple internal evaporators A branch flow path opening / closing means for opening and closing the branch flow path, and an in-compartment condenser installed in the product storage chamber for heating the product in the product storage chamber using the heat of condensation of the refrigerant among the plurality of product storage chambers; When the product in the product storage chamber is heated by the internal condenser, the refrigerant discharged from the compressor passes through the internal condenser and then flows to the external condenser, and the internal condenser When the product in the product storage chamber is not heated, the refrigerant discharged from the compressor is In-condenser flow path switching means that flows to the external condenser without passing through the condenser, refrigerant piping between the external condenser and the branch flow path opening / closing means, and suction side piping of the compressor A bypass flow path opening and closing means for opening and closing the bypass flow path on the inflow side of the external storage evaporator, the bypass flow path opening and closing means and the external storage A bypass passage expansion means provided in the bypass passage between the evaporator and the decompression means for decompressing the refrigerant that has been condensed by the internal condenser and the external condenser and has flowed into the bypass passage;
Among the plurality of product storage chambers, the refrigerant installed in at least one product storage chamber in which the internal condenser is not installed is evaporated to evaporate the refrigerant condensed in the external condenser to evaporate the products in the product storage chamber. A cold evaporator in the refrigerator that cools at a temperature higher than the temperature of the refrigerator, and a branch passage that opens and closes the branch passage that branches the refrigerant flow passage to the cold evaporator in the refrigerator and the cold evaporator in the refrigerator. Weak cold evaporating by means of a refrigerant flowing into the internal cold evaporator in the cold cold flow path opening / closing means and a flow path between the weak cold branch flow opening / closing means and the internal cold evaporator Weakly branched flow path expansion means for reducing the pressure of the refrigerant so that the temperature of the vessel does not fall below the freezing temperature of the cooled product.

  As a result, at a low outside temperature when the load on the cooling chamber is reduced, the product storage room having the internal condenser is heated by the internal condenser, but the refrigerant can flow to the internal evaporator in the other product storage room. Even if it is not, the operation of the compressor can be continued by using the refrigerant flow path that allows the refrigerant to flow to one or both of the internal cold evaporator and external evaporator, and the heat pump heating capacity of the internal condenser The amount of power consumption can be further reduced by an efficient heat pump heating operation.

  The vending machine according to the present invention heats by the internal condenser in the product storage room having the internal condenser at the time of low outside air temperature where the load on the cooling room is reduced, but evaporates in the other product storage rooms. Even if the refrigerant cannot flow through the compressor, the operation of the compressor can be continued by using the refrigerant flow path that allows the refrigerant to flow through one or both of the internal cold evaporator and the external evaporator. The heat pump heating capacity can be increased, and the power consumption can be further reduced by the efficient heat pump heating operation.

FIG. 3 is a refrigerant circuit diagram of the vending machine according to the first embodiment of the present invention. The refrigerant circuit figure at the time of the cooling operation which cools only the 1st cooling greenhouse in the vending machine of Embodiment 1 of this invention Refrigerant circuit diagram during cooling operation for cooling the second cooling greenhouse and the cooling exclusive room in the vending machine according to the first embodiment of the present invention. Refrigerant circuit diagram during cooling operation for cooling only the cooling-only room in the vending machine according to Embodiment 1 of the present invention In the vending machine according to the first embodiment of the present invention, the first cooling greenhouse is heated by the internal condenser, and the second cooling greenhouse and the cooling exclusive chamber are cooled. Refrigerant circuit diagram showing the refrigerant flow path when the refrigerant does not flow through the evaporator and the outside evaporator In the vending machine according to Embodiment 1 of the present invention, the first cold-heating greenhouse is heated by the internal condenser to cool the cooling-dedicated room, and the low-temperature evaporator and the external evaporator are used in the cooling / heating operation. Refrigerant circuit diagram showing the refrigerant flow path when no refrigerant flows through In the vending machine according to Embodiment 1 of the present invention, the first cooling greenhouse is heated by the internal condenser to cool the second cooling greenhouse and the cooling exclusive chamber, and the outside evaporator is used during the cooling and heating operation. Refrigerant circuit diagram showing the refrigerant flow path when the refrigerant is allowed to flow and the refrigerant is not allowed to flow into the cold evaporator In the vending machine according to Embodiment 1 of the present invention, the first cooling greenhouse is heated by the internal condenser to cool the cooling exclusive chamber, and the refrigerant is poured into the external evaporator during the cooling and heating operation. Refrigerant circuit diagram showing the refrigerant flow path when no refrigerant flows through the cold evaporator In the vending machine according to Embodiment 1 of the present invention, during the heating operation in which the first cooling greenhouse is heated by the internal condenser, the refrigerant is allowed to flow through the external evaporator and the internal cold cooling evaporator is allowed to flow. Refrigerant circuit diagram showing refrigerant flow path when no Refrigerant in the case where the first cold-heated greenhouse in the vending machine according to the first embodiment of the present invention is heated by the internal condenser during the heating operation, and the refrigerant is allowed to flow through the internal cold evaporator and the external evaporator. Refrigerant circuit diagram showing the flow path In the vending machine according to Embodiment 1 of the present invention, during the heating operation in which the first cooling greenhouse is heated by the internal condenser, the refrigerant is allowed to flow in the internal cold evaporator and the refrigerant is allowed to flow in the external evaporator. Refrigerant circuit diagram showing refrigerant flow path when no Cooling and heating in which the first cooling greenhouse in the vending machine according to the first embodiment of the present invention is heated by the internal condenser, the second cooling greenhouse is heated by the heating heater, and the cooling exclusive chamber is cooled. Refrigerant circuit diagram showing the refrigerant flow path when the refrigerant does not flow to the cold storage evaporator and the external evaporator during operation Cooling and heating in which the first cooling greenhouse in the vending machine according to the first embodiment of the present invention is heated by the internal condenser, the second cooling greenhouse is heated by the heating heater, and the cooling exclusive chamber is cooled. Refrigerant circuit diagram showing the refrigerant flow path when the refrigerant flows through the external evaporator during operation and the refrigerant does not flow through the internal cold evaporator In the vending machine according to Embodiment 1 of the present invention, the first cooling greenhouse is heated by the internal condenser and the second cooling greenhouse is heated by the heating heater. Refrigerant circuit diagram showing the refrigerant flow path when the refrigerant is allowed to flow and the refrigerant is not allowed to flow into the cold evaporator In the vending machine according to Embodiment 1 of the present invention, the first cooling greenhouse is heated by the internal condenser and the second cooling greenhouse is heated by the heating heater, and the interior is slightly cooled. Refrigerant circuit diagram showing the refrigerant flow path when the refrigerant flows through the evaporator and the external evaporator In the vending machine according to Embodiment 1 of the present invention, the first cooling greenhouse is heated by the internal condenser and the second cooling greenhouse is heated by the heating heater, and the interior is slightly cooled. Refrigerant circuit diagram showing the refrigerant flow path when the refrigerant flows through the evaporator and the refrigerant does not flow through the outside evaporator In the vending machine according to Embodiment 1 of the present invention, the first cooling greenhouse is heated by a heating heater, and the second cooling greenhouse and the cooling exclusive chamber are cooled. Refrigerant circuit diagram showing the refrigerant flow path when the refrigerant does not flow to the evaporator and the outside evaporator In the cooling / heating operation in which the first cooling greenhouse in the vending machine according to the first embodiment of the present invention is heated by the heating heater to cool the cooling exclusive chamber, Refrigerant circuit diagram showing the refrigerant flow path when no refrigerant flows Refrigerant circuit diagram of a conventional vending machine Refrigerant circuit diagram showing refrigerant flow path during cooling operation for cooling all rooms in a conventional vending machine In the case of flowing the refrigerant through the external evaporator during the cooling and heating operation in which the first cooling greenhouse in the conventional vending machine is heated by the internal condenser and the second cooling greenhouse and the cooling exclusive chamber are cooled. Refrigerant circuit diagram showing the refrigerant flow path When the first cooling greenhouse in a conventional vending machine is heated by a condenser in the cabinet and the second cooling greenhouse and the cooling exclusive chamber are cooled and the refrigerant is not supplied to the outside evaporator during the cooling and heating operation. Refrigerant circuit diagram showing the refrigerant flow path Refrigerant circuit diagram showing the refrigerant flow path during the heating operation in which the first cooling greenhouse in the conventional vending machine is heated by the internal condenser.

According to a first aspect of the present invention, a compressor, an outside-condenser that condenses the refrigerant discharged from the compressor, and a product stored by evaporating the refrigerant that is installed in a plurality of product storage chambers and condensed by the outside-condenser An internal evaporator that cools indoor products, and a branch flow path opening and closing that opens and closes the branch flow path between the plurality of internal evaporators and a branch point that branches the refrigerant flow path to the multiple internal evaporators Means, a condensing unit installed in the product storing room for heating the product in the product storing room using the heat of condensation of the refrigerant among the plurality of product storing rooms, When the product is heated, the refrigerant discharged from the compressor passes through the internal condenser and then flows to the external condenser, and the internal condenser does not heat the product in the commodity storage chamber. Sometimes the refrigerant discharged from the compressor does not pass through the internal condenser and the external condenser The external condenser provided in the bypass flow path for bypassing the internal condenser flow path switching means, the refrigerant pipe between the external condenser and the branch flow path opening / closing means, and the suction side pipe of the compressor Provided in the bypass channel between the evaporator, the bypass channel opening and closing means for opening and closing the bypass channel on the inflow side of the outside evaporator, and between the bypass channel opening and closing unit and the outside evaporator Bypass passage expansion means for reducing the pressure of the refrigerant condensed by the internal condenser and the external condenser and flowing into the bypass passage, and the internal condenser is not installed among a plurality of product storage chambers An internal cold storage evaporator that evaporates a refrigerant that is installed in at least one product storage room and condenses in the external condenser to cool the product in the product storage room at a temperature higher than that of the internal evaporator; Dividing the refrigerant flow path into the inner cold evaporator A weakly branched flow path opening / closing means for opening and closing a branch flow path between the point and the internal cold evaporator, and a flow path between the weak cold branch flow path opening / closing means and the internal cold evaporator And a weakly branched branch passage expansion means for decompressing the refrigerant so that the temperature of the cold evaporator in the refrigerator does not become below the freezing temperature of the cooled product due to the refrigerant flowing into the cold evaporator in the refrigerator. It is a vending machine.

  With the above configuration, at the time of low outside air temperature when the load on the cooling chamber is reduced, the product storage room having the internal condenser is heated by the internal condenser, but the refrigerant is supplied to the internal evaporators of the other product storage rooms. Even if it is not possible to flow, the compressor operation can be continued by setting the refrigerant flow path to flow the refrigerant to one or both of the internal cold evaporator and the external evaporator, and the heat pump heating of the internal condenser The power consumption can be further reduced by increasing the capacity and efficient heat pump heating operation.

  Further, the temperature of the internal cold evaporator is cooled by the refrigerant flowing into the internal cold evaporator in the flow path between the weak cold branch opening / closing means and the internal cold evaporator. It has weak branching channel expansion means for decompressing the refrigerant so that the temperature does not fall below the freezing temperature, and the temperature of the cold evaporator in the refrigerator is frozen by the refrigerant flowing into the cold evaporator in the refrigerator. When the cooling product in the product storage room where the internal cold evaporator is installed is not cooled by the internal evaporator, the refrigerant is passed through the internal cold evaporator to cool the internal condenser. Can be heated.

  In the second invention, a capillary tube is used as the weak cooling branch passage expansion means in the first invention, and the configuration is more than that when an electronic expansion valve is used as the weak cooling branch passage expansion means. Easy and cost saving.

  Hereinafter, embodiments of a vending machine according to the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a refrigerant circuit diagram of a vending machine according to Embodiment 1 of the present invention. FIG. 2 is a refrigerant circuit diagram during a cooling operation for cooling only the first cooling greenhouse in the vending machine according to the first embodiment of the present invention. FIG. 3 is a refrigerant circuit diagram during cooling operation for cooling the second cooling greenhouse and the cooling exclusive chamber in the vending machine according to the first embodiment of the present invention. FIG. 4 is a refrigerant circuit diagram during a cooling operation for cooling only the cooling-dedicated room in the vending machine according to the first embodiment of the present invention.

  FIG. 5 shows a cooling and heating operation in which the first cooling greenhouse in the vending machine according to the first embodiment of the present invention is heated by the internal condenser to cool the second cooling greenhouse and the cooling exclusive chamber. It is a refrigerant circuit diagram which shows the refrigerant | coolant flow path in the case of not flowing a refrigerant | coolant to the inside cold-cooling evaporator and the outside evaporator. FIG. 6 shows a low-temperature evaporator in the refrigerator during the cooling and heating operation in which the first cooling greenhouse in the vending machine according to Embodiment 1 of the present invention is heated by the internal condenser and the cooling exclusive chamber is cooled. It is a refrigerant circuit diagram which shows the refrigerant | coolant flow path in case a refrigerant | coolant is not flowed to an external evaporator.

  FIG. 7 shows a cooling and heating operation in which the first cooling greenhouse in the vending machine according to the first embodiment of the present invention is heated by the internal condenser to cool the second cooling greenhouse and the cooling exclusive chamber. It is a refrigerant circuit diagram which shows a refrigerant | coolant flow path in the case of flowing a refrigerant | coolant to an external evaporator and not flowing a refrigerant | coolant to the inside cold evaporator. FIG. 8 shows the refrigerant in the external evaporator during the cooling and heating operation in which the first cooling greenhouse in the vending machine according to Embodiment 1 of the present invention is heated by the internal condenser and the cooling exclusive chamber is cooled. It is a refrigerant circuit diagram which shows the refrigerant | coolant flow path in the case of not flowing a refrigerant | coolant in the sink cold evaporator. FIG. 9 shows a low-cooling evaporator inside the refrigerator by flowing a refrigerant through the external evaporator during the heating operation in which the first cooling greenhouse in the vending machine according to Embodiment 1 of the present invention is heated by the internal condenser. It is a refrigerant circuit figure which shows the refrigerant | coolant flow path when not flowing a refrigerant | coolant in FIG.

  FIG. 10 shows the refrigerant in the cold storage evaporator and the external evaporator during the heating operation in which the first cooling greenhouse in the vending machine according to Embodiment 1 of the present invention is heated by the internal condenser. It is a refrigerant circuit diagram which shows the refrigerant | coolant flow path in the case of flowing. FIG. 11 shows an external evaporator in which a refrigerant is poured into the cold storage evaporator during the heating operation in which the first cooling greenhouse in the vending machine according to Embodiment 1 of the present invention is heated by the internal condenser. It is a refrigerant circuit figure which shows the refrigerant | coolant flow path when not flowing a refrigerant | coolant in FIG.

  FIG. 12 shows the first cooling greenhouse in the vending machine according to the first embodiment of the present invention, which is heated by the internal condenser, and the second cooling greenhouse is heated by the heating heater, thereby cooling the cooling exclusive chamber. It is a refrigerant circuit diagram which shows the refrigerant | coolant flow path in the case of not flowing a refrigerant | coolant to the inside cold-cooling evaporator and the outside evaporator at the time of the cooling heating operation to perform.

  FIG. 13 shows the first cooling greenhouse in the vending machine according to the first embodiment of the present invention, which is heated by the internal condenser, the second cooling greenhouse is heated by the heating heater, and the cooling exclusive chamber is cooled. It is a refrigerant circuit diagram which shows a refrigerant | coolant flow path in the case of making a refrigerant | coolant flow into an external evaporator and not flowing a refrigerant | coolant into a cold-cooled evaporator in a store | warehouse | chamber at the time of the cooling heating operation to perform. FIG. 14 shows a heating operation in which the first cooling greenhouse in the vending machine according to the first embodiment of the present invention is heated by the internal condenser and the second cooling greenhouse is heated by the heating heater. It is a refrigerant circuit diagram which shows a refrigerant | coolant flow path in the case of flowing a refrigerant | coolant to an external evaporator and not flowing a refrigerant | coolant to the inside cold evaporator.

  FIG. 15 shows a heating operation in which the first cooling greenhouse in the vending machine according to the first embodiment of the present invention is heated by the internal condenser and the second cooling greenhouse is heated by the heating heater. It is a refrigerant circuit diagram which shows the refrigerant | coolant flow path in the case of flowing a refrigerant | coolant to an inside cold-cooled evaporator and an outside evaporator. FIG. 16 shows a heating operation in which the first cooling greenhouse in the vending machine according to the first embodiment of the present invention is heated by the internal condenser and the second cooling greenhouse is heated by the heating heater. It is a refrigerant circuit diagram which shows a refrigerant | coolant flow path in the case of flowing a refrigerant | coolant in a warehouse cold-cooled evaporator, and not flowing a refrigerant | coolant to an external evaporator.

  FIG. 17 shows the storage at the time of the cooling and heating operation in which the first cooling greenhouse in the vending machine according to the first embodiment of the present invention is heated by the heating heater to cool the second cooling greenhouse and the cooling exclusive chamber. It is a refrigerant circuit diagram which shows the refrigerant | coolant flow path in the case of not flowing a refrigerant | coolant to an internal weak-cooling evaporator and an external evaporator. FIG. 18 shows a low-temperature evaporator and a refrigerator in a cooling and heating operation in which the first cooling greenhouse in the vending machine according to the first embodiment of the present invention is heated by a heating heater and the cooling exclusive chamber is cooled. It is a refrigerant circuit figure which shows the refrigerant | coolant flow path when not flowing a refrigerant | coolant to an outer evaporator.

  As shown in FIG. 1, the vending machine according to the first embodiment includes a product storage 1 for storing products and a machine room (not shown) disposed in the lower part of the product storage 1.

  The product storage 1 has a first cooling greenhouse 2 that cools or warms the stored product, a second cooling greenhouse 3 that cools or warms the stored product, and cools the stored product. It is partitioned into a cooling chamber 4. In addition, in each product storage room, a product storage shelf (not shown) is suspended at the top, and the products are stored inside.

  In the machine room, the compressor 5, the outside condenser 40 that condenses the refrigerant discharged from the compressor 5, the outside evaporator 41, and the outside condenser 40 are located on the windward side and the outside evaporator. An outside fan that is located in the vicinity of the outside condenser 40 and the outside evaporator 41 so that 41 is on the leeward side and blows air so that heat exchange between the outside condenser 40 or the outside evaporator 41 is promoted. 26 is arranged.

In the first cooling greenhouse 2, the refrigerant condensed in the outside condenser 40 is evaporated to cool the products in the first cooling greenhouse 2 and discharged from the compressor 5. The inside condenser 46 for condensing the refrigerant to heat the product in the first cooling greenhouse 2, and the inside evaporator 47 and the inside condenser 46 are arranged in the vicinity of the inside evaporator 47 or Separately from the internal fan 27 for circulating the air heat-exchanged with the internal condenser 46 in the first cooling chamber 2 and the products in the first cooling chamber 2 as required separately from the internal condenser 46 A warming heater 30 that is energized to generate heat when warming and a temperature sensor (not shown) that detects the indoor temperature of the first cooling greenhouse 2 are arranged.

  In the second cooling greenhouse 3, the refrigerant condensed by the external condenser 40 (condensed by the internal condenser 46 and the external condenser 40 when the refrigerant is flowing in the internal condenser 46) is stored. The internal evaporator 9 that cools the product in the second cooling greenhouse 3 by evaporating, and the air that is disposed in the vicinity of the internal evaporator 9 and exchanges heat with the internal evaporator 9 is subjected to the second cooling and heating. The internal fan 28 that circulates in the greenhouse 3, the heating heater 31 that is energized to heat the product in the second cooling greenhouse 3, and the indoor temperature of the second cooling greenhouse 3 A temperature sensor (not shown) for detection is arranged.

  In the cooling exclusive chamber 4, the refrigerant condensed by the external condenser 40 (condensed by the internal condenser 46 and the external condenser 40 when the refrigerant is flowing in the internal condenser 46) is evaporated. Condensation in the internal evaporator 10 that cools the product in the cooling exclusive chamber 4 and the external condenser 40 (in the case where the refrigerant flows through the internal condenser 46, the internal condenser 46 and the external condenser 40 The internal cold-cooled evaporator 54 that cools the refrigerant in the cooling-only chamber 4 at a higher temperature than the internal evaporator 10, and the internal evaporator 10 and the internal cold evaporator 54, the internal fan 29 that circulates the air exchanged with the internal evaporator 10 or the internal cold evaporator 54 in the exclusive cooling chamber 4, and the indoor temperature of the exclusive cooling chamber 4 is detected. A temperature sensor (not shown) is arranged.

  The first cooling chamber 2 is cooled at a branch point where the refrigerant flow path branches to the internal evaporator 47 side and the internal evaporators 9 and 10 side and the internal evaporator 47. Therefore, when the refrigerant flows through the internal evaporator 47, it is open, and since the cooling of the first cooling greenhouse 2 is not required, it is closed when the refrigerant does not flow through the internal evaporator 47. An electromagnetic valve 51 is provided as a branch flow path opening / closing means.

  In addition, at the branching point where the refrigerant flow path branches into the internal evaporator 9 side and the internal evaporator 10 side, the refrigerant flow path toward the internal evaporator 9 and the refrigerant flow toward the internal evaporator 10 are provided. A three-way valve 42 is provided as a branch channel opening / closing means capable of switching the channel or closing both channels simultaneously.

  The refrigerant flow path between the electromagnetic valve 51 and the internal evaporator 47 is provided with an expansion mechanism 43 that depressurizes the refrigerant flowing through the internal evaporator 47, and is provided between the three-way valve 42 and the internal evaporator 9. The refrigerant flow path is provided with an expansion mechanism 44 for reducing the pressure of the refrigerant flowing into the internal evaporator 9. The refrigerant flow path between the three-way valve 42 and the internal evaporator 10 is connected to the internal passage from the three-way valve 42. An expansion mechanism 45 for reducing the pressure of the refrigerant flowing in the direction of the evaporator 10 is provided.

  The refrigerant outlet side of the internal evaporator 9 is connected to a refrigerant pipe connecting the expansion mechanism 45 and the internal evaporator 10, and the refrigerant that has flowed out of the internal evaporator 9 enters the internal evaporator 10. It is configured to flow in.

  The refrigerant pipe on the discharge side of the compressor 5 causes the refrigerant discharged from the compressor 5 to pass through the internal condenser 46 when the product in the first cooling greenhouse 2 is heated by the internal condenser 46. Then, the refrigerant discharged from the compressor 5 when flowing into the external condenser 40 and not warming the product in the first cooling greenhouse 2 is not passed through the internal condenser 46 to the external condenser 40. A three-way valve 57 is provided as a flow path switching means for the internal condenser to flow.

  The refrigerant outlet side of the internal condenser 46 of the first cooling greenhouse 2 is connected to the three-way valve 57 and the internal storage via an expansion mechanism 48 that decompresses the refrigerant condensed in the internal condenser 46 and a check valve 58. The refrigerant pipe is connected to the outer condenser 40.

The check valve 58 is arranged so that the refrigerant flowing out of the internal condenser 46 is decompressed by the expansion mechanism 48 and flows to the external condenser 40 via the check valve 58. In other words, the refrigerant discharged from the three-way valve 57 in a state where the refrigerant discharged from the compressor 5 does not flow into the internal condenser 46 but flows into the external condenser 40 is reversed so as not to pass through the check valve 58. A stop valve 58 is arranged.

  In the machine room, the outside evaporator 41 includes a refrigerant outlet of the outside condenser 40, and a branch point that branches the refrigerant flow path to the inside evaporator 47 side and the inside evaporators 9 and 10 side. It is provided in the bypass flow path which bypasses the refrigerant | coolant piping (refrigerant piping of the exit side of the refrigerant | coolant of the condenser 40 outside a warehouse) and the suction side piping of the compressor 5 between.

  An electromagnetic valve 52 as a bypass channel opening / closing means for opening and closing the bypass channel is provided on the refrigerant inlet side of the external evaporator 41 (the refrigerant inlet side of the bypass channel).

  In addition, in the bypass flow path between the electromagnetic valve 52 and the external evaporator 41, a bypass flow path expansion that decompresses the refrigerant condensed in the internal condenser 46 and the external condenser 40 and flowing into the bypass flow path. An expansion mechanism 53 is provided as a means.

  The electromagnetic valve 52 as the bypass flow path opening / closing means is opened only when the refrigerant discharged from the compressor 5 flows to the outside condenser 40 via the inside condenser 46.

  The inlet side of the refrigerant in the internal cold evaporator 54 is weakly cooled to open and close the branch flow path between the branch point where the refrigerant flow path branches into the internal cold evaporator 54 and the internal cold evaporator 54. Cold cooling in the chamber is performed by the electromagnetic valve 56 serving as the branch channel opening / closing means, and the refrigerant that is disposed in the flow path between the electromagnetic valve 56 and the cold cooling evaporator 54 in the chamber and flows into the cold cooling evaporator 54 in the chamber. The bypass channel on the upstream side of the refrigerant with respect to the solenoid valve 52 through the expansion mechanism 55 as the weakly-cooled branch channel expansion means for reducing the pressure of the refrigerant so that the temperature of the vessel 54 does not fall below the temperature at which the cooled product freezes. It is connected to the.

  It should be noted that the upstream end of the branch flow path that flows through the internal cold evaporator 54 is not connected to the bypass flow path upstream of the refrigerant with respect to the solenoid valve 52, but on the downstream side of the refrigerant with respect to the external condenser 40. You may connect to the refrigerant | coolant flow path upstream of a refrigerant | coolant rather than the three-way valve 42. FIG.

  The refrigerant outlet side of the internal cold evaporator 54 has a junction point where the refrigerant outlet side branch flow path of the internal evaporator 47 and the refrigerant outlet side branch flow path of the internal evaporator 10 merge. The refrigerant pipe between the suction side of the compressor 5 is connected.

  The refrigerant that has flowed out of the internal cold evaporator 54, the refrigerant that has flowed out of the internal evaporator 47, and the refrigerant that has flowed out of the internal evaporator 10 are separated into gas refrigerant and liquid refrigerant by the gas-liquid separator 59, The gas refrigerant separated from the liquid refrigerant by the gas-liquid separator 59 is sucked into the compressor 5.

  In the drawing, the refrigerant outlet side (downstream end of the bypass flow path) of the external evaporator 41 is connected to the refrigerant downstream side of the gas-liquid separator 59, but the refrigerant outlet side of the external evaporator 41 is shown. You may connect (the downstream end of a bypass flow path) to the upstream of a refrigerant | coolant rather than the gas-liquid separator 59. FIG.

  Each of the outside condenser 40 and the outside evaporator 41 is a heat exchanger in which piping passes through a plurality of fins arranged in parallel and spaced apart from each other and end plates arranged on both sides of the fins. Yes, the end plate for the external condenser 40 and the end plate for the external evaporator 41 are connected, but the fin through which the pipe for the external condenser 40 passes and the pipe for the external evaporator 41 are connected. It is not connected to the penetrating fin.

That is, the external condenser 40 and the external evaporator 41 are two-pass heat exchangers that are integrated so that the fins are separate and share the end plate, and when the external fan 26 is operated, It arrange | positions so that piping for the outer condenser 40 may be on the leeward side, and piping for the outside evaporator 41 may be on the leeward side.

  The piping for the outside condenser 40 and the piping for the outside evaporator 41 are each configured such that the refrigerant flows in the piping from the top to the bottom.

  Here, in a general vending machine, the second cooling greenhouse 3 is often the narrowest room, and the internal evaporator 9 installed in the second cooling greenhouse 3 It is smaller than the internal evaporator 47 installed in the first cooling greenhouse 2 and the internal evaporator 9 installed in the cooling chamber 4.

  Therefore, in order to ensure the evaporation capability of the internal evaporator 9 alone, it is necessary to enlarge the expansion mechanism 44 to greatly lower the evaporation temperature, which reduces the efficiency of the compressor 5 and reduces the power consumption. Will increase.

  Therefore, by connecting the refrigerant outlet of the internal evaporator 9 and the refrigerant inlet of the internal evaporator 10 so that the internal evaporator 9 and the internal evaporator 10 can be handled as one large evaporator. The evaporating temperature is raised to increase the efficiency and reduce the power consumption.

  The operation of the vending machine of the present embodiment configured as described above will be described below.

  First, in the case of the cooling operation in which only the first cooling greenhouse 2 is cooled, the refrigerant flows in the direction of the arrow through the thick refrigerant path in FIG.

  In the cooling operation in which only the first cooling greenhouse 2 is cooled, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the external condenser 40 are in communication with each other, and the three-way valve 42 is an internal evaporator. 9 and the flow path to the expansion mechanism 45 for the internal evaporator 10 are closed, the electromagnetic valve 51 is opened, the electromagnetic valve 52 and the electromagnetic valve 56 are closed, and the compression is performed. The machine 5 is activated. Regardless of whether the compressor 5 is operated or stopped, the solenoid valve 50 is always opened.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and is cooled and condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40. The refrigerant condensed in the outside condenser 40 flows from the electromagnetic valve 51 to the expansion mechanism 43 side, and after being depressurized by the expansion mechanism 43, is evaporated and vaporized by the internal evaporator 47 to cool the first cooling greenhouse 2. To do.

  In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40. When the refrigerant is flowing through the internal evaporator 47, the internal fan 27 blows air to the internal evaporator 47.

  The refrigerant flowing out of the internal evaporator 47 is separated into gas refrigerant and liquid refrigerant by the gas-liquid separator 59, and the gas refrigerant separated from the liquid refrigerant by the gas-liquid separator 59 is sucked into the compressor 5. It is.

  When the first cooling chamber 2 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the electromagnetic valve 51 is closed, the compressor 5 and the internal fan 27 are stopped, and the compressor 5 is stopped. If the temperature in the 1st cooling greenhouse 2 rises to the predetermined temperature used as the upper limit of a cooling temperature range, while opening the solenoid valve 51, the compressor 5 will be started and the internal fan 27 will be drive | operated.

When the compressor 5 is stopped, in order to balance the high and low pressures of the refrigerant circuit, the three-way valve 42 is opened, the refrigerant outlet of the internal condenser 46 and the suction side (suction side) of the compressor 5. Communicate with piping.

  By always opening the solenoid valve 50, excess refrigerant can be stored in the internal condenser 46 that is not used in the cooling operation while the compressor 5 is stopped, so that an excessive amount of refrigerant can be prevented during the cooling operation. It becomes possible. Further, every time the compressor 5 stops, the electromagnetic valve 50 is opened, and the refrigerant leaks at the three-way valve 57, so that the refrigerant is continuously stored in the internal condenser 46 and falls into a refrigerant shortage state. Can be prevented.

  When the first cooling greenhouse 2 is switched from the heating operation to the cooling operation or at the initial pull-down at a high outside air temperature, when the inside temperature is high and a large refrigerating capacity is required, the compression is performed. Regardless of whether the machine 5 is operated or stopped, the solenoid valve 50 is always opened so that the refrigerant outlet of the internal condenser 46 and the suction side (suction side) pipe of the compressor 5 communicate with each other. Therefore, a large refrigeration capacity can be obtained and the pull-down time can be shortened.

  Next, in the case of the cooling operation for cooling the second cooling greenhouse 3 and the cooling exclusive chamber 4, the operation is such that the refrigerant flows in the direction of the arrow through the thick refrigerant passage in FIG.

  In the cooling operation for cooling the second cooling greenhouse 3 and the cooling exclusive chamber 4, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the external condenser 40 are in communication with each other, and the three-way valve 42. Opens the flow path to the expansion mechanism 44 for the internal evaporator 9 and closes the flow path to the expansion mechanism 45 for the internal evaporator 10, and the electromagnetic valve 51, the electromagnetic valve 52, and the electromagnetic valve 56 are closed. The compressor 5 is closed and the compressor 5 is started. Regardless of whether the compressor 5 is operated or stopped, the solenoid valve 50 is always opened.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and is cooled and condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40. The refrigerant condensed in the outside condenser 40 flows from the three-way valve 42 to the expansion mechanism 44 side, and after being decompressed by the expansion mechanism 44, the refrigerant is evaporated and evaporated in the internal evaporator 9 to cool the second cooling greenhouse 3. To do. When the refrigerant is flowing through the internal evaporator 9, the internal fan 28 blows air to the internal evaporator 9.

  The excess liquid refrigerant that could not be evaporated by the internal evaporator 9 is evaporated by the internal evaporator 10 connected in series with the internal evaporator 9 to cool the cooling exclusive chamber 4 (series cooling operation). . When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  Thereafter, when the temperature of the second cooling greenhouse 3 reaches the target temperature (the lower limit value of the cooling temperature range), the three-way valve 42 is switched so that the refrigerant flows from the three-way valve 42 to the expansion mechanism 45. By performing the operation in which the refrigerant flow in the thick line 4 flows in the direction of the arrow, only the internal evaporator 10 out of the internal evaporator 9 and the internal evaporator 10 is cooled alone (downstream single cooling). operation).

  By performing the serial cooling operation preferentially in this way, the cooling exclusive chamber 4 is also cooled by the surplus liquid refrigerant, so that the operating rate of the downstream side single cooling operation can be reduced and the power consumption can be reduced. Can do.

  The refrigerant flowing out of the internal evaporator 10 is separated into a gas refrigerant and a liquid refrigerant by the gas-liquid separator 59, and the gas refrigerant separated from the liquid refrigerant by the gas-liquid separator 59 is sucked into the compressor 5. It is.

Then, the control means (not shown) switches and compresses the three-way valve 42 so that the temperature in each of the second cooling greenhouse 3 and the cooling exclusive chamber 4 is maintained within a preset cooling temperature range. The operation of the machine 5, the outside fan 26, and the inside fans 28 and 29 is controlled.

  Further, when the second cooling chamber 3 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the three-way valve is brought into a state in which the flow path to the expansion mechanism 44 is closed and the flow path to the expansion mechanism 45 is opened. 42 is switched and the internal fan 28 is stopped. If the temperature in the second cooling greenhouse 3 rises to a predetermined temperature that is the upper limit value of the cooling temperature range while the compressor 5 is stopped, the flow path to the expansion mechanism 44 is opened and the expansion mechanism 45 is connected. The three-way valve 42 is switched to a state in which the flow path is closed, the compressor 5 is started, and the internal fan 28 is operated.

  Further, the three-way valve 42 closes the flow path to the expansion mechanism 44 and opens the flow path to the expansion mechanism 45 so that only the internal evaporator 10 out of the internal evaporator 9 and the internal evaporator 10 is cooled alone. When the temperature in the second cooling greenhouse 3 rises to a predetermined temperature that is the upper limit value of the cooling temperature range in the state where the downstream single cooling operation is performed, the flow path to the expansion mechanism 44 is opened. The internal fan 28 is operated by switching the three-way valve 42 to a state in which the flow path to the expansion mechanism 45 is closed.

  In addition, after the transition from the series cooling operation of the internal evaporator 9 and the internal evaporator 10 to the downstream single cooling operation of only the internal evaporator 10, the predetermined temperature at which the cooling exclusive chamber 4 becomes the lower limit value of the cooling temperature range When the cooling is performed, the compressor 5 is stopped in addition to closing the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 and stopping the internal fan 29.

  If the temperature in the cooling chamber 4 rises to a predetermined temperature that is the upper limit value of the cooling temperature range while the compressor 5 is stopped, the flow path to the expansion mechanism 44 is opened and the flow path to the expansion mechanism 45 is opened. The three-way valve 42 is switched to the closed state, the compressor 5 is started, and the internal fan 29 is operated.

  When the compressor 5 is started, the three-way valve 42 opens the flow path to the expansion mechanism 44 and closes the flow path to the expansion mechanism 45 in advance, and the electromagnetic valve 51, the electromagnetic valve 52, and the electromagnetic valve 56 Occlude.

  When the compressor 5 is stopped, the refrigerant outlet on the expansion mechanism 44 side or the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 is opened to balance the high and low pressures of the refrigerant circuit. The refrigerant outlet of the condenser 46 and the suction side (suction side) piping of the compressor 5 are communicated with each other.

  Then, after the high and low pressures of the refrigerant circuit are balanced, the refrigerant outlet on the expansion mechanism 44 side of the three-way valve 42 or the refrigerant outlet on the expansion mechanism 45 side is closed.

  As a result, excess refrigerant can be stored in the internal condenser 46 that is not used in the cooling operation while the compressor 5 is stopped, so that it is possible to prevent an excessive amount of refrigerant during the cooling operation. Further, it is possible to prevent the refrigerant from being stored in the internal condenser 46 due to the leakage of the refrigerant through the three-way valve 57 and falling into a refrigerant shortage state.

  In addition, when the second cooling greenhouse 3 is switched from the heating operation by the heating heater 31 to the cooling operation, or at the initial pull-down at a high outside air temperature, the temperature in the warehouse is high and a large refrigerating capacity is required. In this case, if the solenoid valve 50 is always opened regardless of the operation / stop of the compressor 5 and the refrigerant outlet of the internal condenser 46 and the suction side (suction side) piping of the compressor 5 are communicated, Since all the refrigerants can be used for the cooling operation, a large refrigerating capacity can be obtained and the pull-down time can be shortened.

  Next, in the case of the cooling operation in which only the cooling exclusive chamber 4 is cooled, the operation is such that the refrigerant flows in the direction of the arrow through the thick refrigerant passage in FIG.

  In the cooling operation in which only the cooling exclusive chamber 4 is cooled, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the external condenser 40 communicate with each other, and the three-way valve 42 is provided for the internal evaporator 9. The flow path to the expansion mechanism 44 is closed, the flow path to the expansion mechanism 45 for the internal evaporator 10 is opened, the electromagnetic valve 51, the electromagnetic valve 52, and the electromagnetic valve 56 are closed, and the compressor 5 is started. To do. Regardless of whether the compressor 5 is operated or stopped, the solenoid valve 50 is always opened.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and is cooled and condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40. The refrigerant condensed in the outside condenser 40 flows from the three-way valve 42 to the expansion mechanism 45 side, and after being depressurized by the expansion mechanism 45, the refrigerant evaporates and cools in the internal evaporator 10 to cool the cooling dedicated chamber 4. When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  The refrigerant flowing out of the internal evaporator 10 is separated into a gas refrigerant and a liquid refrigerant by the gas-liquid separator 59, and the gas refrigerant separated from the liquid refrigerant by the gas-liquid separator 59 is sucked into the compressor 5. It is.

  When the exclusive cooling chamber 4 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the compressor 5 is closed in addition to closing the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 and stopping the internal fan 29. Also stop.

  Further, when the temperature in the exclusive cooling chamber 4 rises to a predetermined temperature that is the upper limit value of the cooling temperature range while the compressor 5 is stopped, the three-way valve 42 is switched to a state in which the flow path to the expansion mechanism 45 is opened. Then, the compressor 5 is started and the internal fan 29 is operated.

  When the compressor 5 is started, the solenoid valve 51, the solenoid valve 52, and the solenoid valve 56 are closed in advance.

  When the compressor 5 is stopped, in order to balance the high and low pressure of the refrigerant circuit, the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 is opened, and the refrigerant outlet of the internal condenser 46 is compressed. The suction side (suction side) piping of the machine 5 is communicated.

  Then, after the high and low pressures of the refrigerant circuit are balanced, the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 is closed.

  As a result, excess refrigerant can be stored in the internal condenser 46 that is not used in the cooling operation while the compressor 5 is stopped, so that it is possible to prevent an excessive amount of refrigerant during the cooling operation. Further, it is possible to prevent the refrigerant from being stored in the internal condenser 46 due to the leakage of the refrigerant through the three-way valve 57 and falling into a refrigerant shortage state.

  When the internal temperature is high and a large refrigeration capacity is required, such as during initial pull-down at a high outside air temperature, the solenoid valve 50 is always opened regardless of whether the compressor 5 is operated or stopped. If the refrigerant outlet of the inner condenser 46 and the suction side (suction side) piping of the compressor 5 are connected, all the refrigerant can be used for the cooling operation, so that a large refrigeration capacity can be obtained and the pull-down time is shortened. It becomes possible.

  Next, in the case of the cooling and heating operation in which the first cooling greenhouse 2 is heated by the internal condenser 46 and the second cooling greenhouse 3 and the cooling exclusive chamber 4 are cooled, the thick line refrigerant in FIG. The operation is such that the refrigerant flows through the flow path in the direction of the arrow.

In the case of the cooling and heating operation in which the first cooling greenhouse 2 is heated by the internal condenser 46 and the second cooling greenhouse 3 and the cooling exclusive chamber 4 are cooled, the three-way valve 57 is connected to the compressor 5. The discharge pipe and the refrigerant inlet of the internal condenser 46 are in communication with each other, and the three-way valve 42 opens the flow path to the expansion mechanism 44 and closes the flow path to the expansion mechanism 45, 51, the solenoid valve 52, and the solenoid valve 56 are closed, and the compressor 5 is started.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. When the refrigerant is flowing through the internal condenser 46, the internal fan 27 blows air to the internal condenser 46.

  Then, the refrigerant exiting the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

  The refrigerant that has flowed out of the outside condenser 40 flows to the three-way valve 42 side because the solenoid valve 51, the solenoid valve 52, and the solenoid valve 56 are closed.

  The liquid refrigerant flowing from the three-way valve 42 toward the expansion mechanism 44 is reduced in pressure by the expansion mechanism 44 and then evaporated and evaporated in the internal evaporator 9 to cool the second cooling greenhouse 3. When the refrigerant is flowing through the internal evaporator 9, the internal fan 28 blows air to the internal evaporator 9.

  The excess liquid refrigerant that could not be evaporated by the internal evaporator 9 is evaporated by the internal evaporator 10 connected in series with the internal evaporator 9 to cool the cooling exclusive chamber 4 (series cooling operation). When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  Thereafter, the internal evaporator is switched by switching the three-way valve 42 so that the refrigerant flows into the expansion mechanism 45 when the temperature of the second cooling greenhouse 3 reaches the target temperature (the lower limit value of the cooling temperature range). 9 and the internal evaporator 10 alone are cooled alone (downstream single cooling operation).

  By performing the serial cooling operation preferentially in this way, the cooling exclusive chamber 4 is also cooled by the surplus liquid refrigerant, so that the operating rate of the downstream side single cooling operation can be reduced and the power consumption can be reduced. Can do.

  The refrigerant flowing out of the internal evaporator 10 is separated into a gas refrigerant and a liquid refrigerant by the gas-liquid separator 59, and the gas refrigerant separated from the liquid refrigerant by the gas-liquid separator 59 is sucked into the compressor 5. It is.

  And a control means (not shown) maintains the room temperature of the 1st cooling heating chamber 2 in the preset heating temperature range, and each room | chamber interior of the 2nd cooling heating chamber 3 and the cooling exclusive room 4 is carried out. The three-way valve 57 and the three-way valve 42 are switched, and the operation of the compressor 5, the external fan 26, and the internal fans 27, 28, and 29 is controlled so that the temperature of the internal combustion engine is maintained within a preset cooling temperature range. ing.

  For example, when the first cooling greenhouse 2 is heated to a predetermined temperature that is the upper limit value of the heating temperature range, the refrigerant outlet of either of the three-way valves 42 is in an open state (the internal evaporator 9 and the internal chamber 9). During the series cooling operation in which the product storage chambers of both the second cooling greenhouse 3 and the cooling exclusive chamber 4 are cooled by the evaporator 10, or only the internal evaporator 10 out of the internal evaporator 9 and the internal evaporator 10. In this case, the internal fan 27 is stopped. Alternatively, as shown in FIG. 3 or FIG. 4, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 communicates with the outside condenser 40 and the inside fan 27 is stopped.

After the internal fan 27 is stopped without switching the three-way valve 57, the internal fan 27 is operated if the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range.

  As shown in FIG. 3 or 4, after switching the three-way valve 57 so that the refrigerant from the compressor 5 does not flow into the internal condenser 46, the temperature of the first cooling greenhouse 2 is the lower limit of the heating temperature range. When the temperature drops to a predetermined temperature, the three-way valve 57 is returned to the state in which the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other as shown in FIG. Drive 27.

  In addition, when the first cooling greenhouse 2 shown in FIG. 5 is heated by the internal condenser 46 and the second cooling greenhouse 3 and the cooling exclusive chamber 4 are cooled and heated, When the second cooling greenhouse 3 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the flow path to the expansion mechanism 44 is closed and the flow path to the expansion mechanism 45 is opened as shown in FIG. The three-way valve 42 is switched to the state and the internal fan 28 is stopped.

  Further, in the state of FIG. 6, the compressor 5 is stopped when the cooling-only chamber 4 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, and the second cooling chamber 3 is stopped while the compressor 5 is stopped. When the internal temperature rises to a predetermined temperature that is the upper limit value of the cooling temperature range, the three-way valve is opened so that the flow path to the expansion mechanism 44 is opened and the flow path to the expansion mechanism 45 is closed as shown in FIG. 42 is switched, the compressor 5 is started, and the internal fan 28 is operated.

  Further, as shown in FIG. 6, the three-way valve 42 closes the flow path to the expansion mechanism 44 and opens the flow path to the expansion mechanism 45, and the internal evaporation of the internal evaporator 9 and the internal evaporator 10. If the temperature in the second cooling greenhouse 3 rises to a predetermined temperature that is the upper limit value of the cooling temperature range in the state where only the cooler 10 is being cooled alone (downstream single cooling operation), as shown in FIG. In addition, the three-way valve 42 is switched to a state where the flow path to the expansion mechanism 44 is opened and the flow path to the expansion mechanism 45 is closed, and the internal fan 28 is operated.

  Further, as shown in FIG. 6, after the transition from the series cooling operation of the internal evaporator 9 and the internal evaporator 10 to the downstream single cooling operation of only the internal evaporator 10, When the temperature rises to a predetermined temperature that is the upper limit value of the warming temperature range, the three-way valve 57 is in a state where the discharge pipe of the compressor 5 and the external condenser 40 communicate with each other as shown in FIG. The refrigerant discharged from the compressor 5 does not flow into the compressor 46), the internal fan 27 is stopped, and the cooling-only chamber 4 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range. Stops the compressor 5 in addition to closing the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 and stopping the internal fan 29.

  Further, as shown in FIG. 6 from the state of FIG. 5, after the transition from the serial cooling operation of the internal evaporator 9 and the internal evaporator 10 to the downstream single cooling operation of only the internal evaporator 10, the cooling exclusive chamber 4 Is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, in addition to closing the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 and stopping the internal fan 29, Either one or both of the electromagnetic valves 56 are opened, and the state shown in any of FIGS. 9 to 11 is obtained, and heat is absorbed by one or both of the outside evaporator 41 and the inside cold evaporator 54. Thus, the heating of the first cooling greenhouse 2 by the internal condenser 46 is continued.

  At this time, when both the solenoid valve 52 and the solenoid valve 56 are opened and the heat is absorbed by both the outside evaporator 41 and the inside cold evaporator 54 shown in FIG. Compared to the state shown in FIG. 9 or FIG. 11 in which only one of the solenoid valves 56 is opened and heat is absorbed by either the outside evaporator 41 or the inside cold evaporator 54, the inside condenser 46 is used. The heating capability of the 1st cooling greenhouse 2 becomes high.

When the first cooling greenhouse 2 is heated by the internal condenser 46 and the cooling and heating operation is performed to cool the second cooling greenhouse 3 and the cooling exclusive chamber 4, the electromagnetic valve 52 of the bypass channel is set. When the external evaporator 41 shown in FIG. 7 is opened and absorbs heat, the external evaporator 41 absorbs heat more than the state shown in FIG. 5 without opening the electromagnetic valve 52 of the bypass channel. The heating capacity of the first cooling greenhouse 2 by the internal condenser 46 is increased.

  In addition, when the first cooling greenhouse 2 is heated by the internal condenser 46 and the cooling heating operation for cooling only the cooling dedicated chamber 4 out of the second cooling greenhouse 3 and the cooling dedicated chamber 4 is performed, a bypass is performed. When the electromagnetic valve 52 in the flow path is opened and heat is absorbed by the external evaporator 41 shown in FIG. 8, the storage is made more than in the state shown in FIG. 6 without opening the electromagnetic valve 52 in the bypass flow path. The amount of heat absorbed by the outer evaporator 41 increases the heating capacity of the first cooling greenhouse 2 by the internal condenser 46.

  When the first cooling greenhouse 2 is heated by the internal condenser 46 and the cooling and heating operation for cooling the second cooling greenhouse 3 and the cooling exclusive chamber 4 is started, the first cooling heating chamber 2 is started. Until the internal temperature of the greenhouse 2 reaches a predetermined internal upper limit temperature (heating end temperature), or until the discharge pressure of the compressor 5 reaches a predetermined compressor overload pressure, the solenoid valve 52 in the bypass passage The cooling and heating operation may be started so that the refrigerant flows in the direction of the arrow in the thick refrigerant passage in FIG.

  In that case, when the discharge pressure of the compressor 5 reaches a predetermined compressor overload pressure, the solenoid valve 52 of the bypass flow path is closed, and the refrigerant passes through the thick refrigerant path of the arrow in FIG. Make it flow in the direction.

  The solenoid valve 52 of the bypass flow path is opened and the cooling and heating operation is started so that the refrigerant flows in the direction of the arrow in the thick refrigerant flow path of FIG. 7, and the discharge pressure of the compressor 5 is a predetermined compressor. When the overload pressure is reached, the solenoid valve 52 of the bypass flow path is closed so that the refrigerant flow path shown by the thick line in FIG. 5 flows in the direction of the arrow, and then the discharge pressure of the compressor 5 changes to the compressor overload. If the pressure is reduced to a predetermined compressor normal pressure (reopen pressure) lower than the pressure, the electromagnetic valve 52 of the bypass flow path is opened, and the refrigerant again flows in the direction of the arrow through the thick refrigerant path of FIG. Like that.

  More specifically, when starting the cooling and heating operation for heating the first cooling greenhouse 2 and cooling the second cooling greenhouse 3 and the cooling exclusive chamber 4, as shown in FIG. The valve 57 is in a state where the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other, and the three-way valve 42 opens the flow path to the expansion mechanism 44 and opens the flow path to the expansion mechanism 45. Is closed, the electromagnetic valve 51 and the electromagnetic valve 56 are closed, the electromagnetic valve 52 is opened, and the compressor 5 is started.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. When the refrigerant is flowing through the internal condenser 46, the internal fan 27 blows air to the internal condenser 46.

  The refrigerant exiting the internal condenser 46 is depressurized by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

  The refrigerant that has flowed out of the external condenser 40 flows from the three-way valve 42 to the expansion mechanism 44 side for the internal evaporator 9, and the refrigerant that branches to the bypass flow path and flows from the electromagnetic valve 52 to the expansion mechanism 53 side. Divided into

  The refrigerant that has flowed from the three-way valve 42 toward the expansion mechanism 44 for the internal evaporator 9 is decompressed by the expansion mechanism 44 and then evaporated and evaporated in the internal evaporator 9 to cool the second cooling greenhouse 3. . When the refrigerant is flowing through the internal evaporator 9, the internal fan 28 blows air to the internal evaporator 9.

  The excess liquid refrigerant that could not be evaporated by the internal evaporator 9 is evaporated by the internal evaporator 10 connected in series with the internal evaporator 9 to cool the cooling exclusive chamber 4 (series cooling operation). When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  Thereafter, when the temperature of the second cooling greenhouse 3 reaches the target temperature (the lower limit value of the cooling temperature range), the three-way valve 42 is switched so that the refrigerant flows into the expansion mechanism 45 for the internal evaporator 10. Thus, as shown in FIG. 8, only the internal evaporator 10 out of the internal evaporator 9 and the internal evaporator 10 is individually cooled (downstream side independent cooling operation).

  By performing the serial cooling operation preferentially in this way, the cooling exclusive chamber 4 is also cooled by the surplus liquid refrigerant, so that the operating rate of the downstream side single cooling operation can be reduced and the power consumption can be reduced. Can do.

  On the other hand, the refrigerant branched into the bypass flow path and flowing from the electromagnetic valve 52 to the expansion mechanism 53 side is evaporated by the external evaporator 41 after being decompressed by the expansion mechanism 53.

  Then, the gaseous refrigerant that has flowed out of the internal evaporator 10 and the gaseous refrigerant that has flowed out of the external evaporator 41 merge and return to the compressor 5.

  Thereafter, if the discharge pressure of the compressor 5 reaches a predetermined compressor overload pressure, the solenoid valve 52 of the bypass flow path is closed.

  Here, examples of the discharge pressure detection means of the compressor 5 include a pressure sensor that is provided on the discharge pipe and directly measures the pressure of the refrigerant, a thermistor provided on the discharge pipe, and the like.

  However, the discharge pressure of the compressor 5 can be approximated by the piping temperature in the vicinity of the heat exchanger in the form of the condensation temperature, and in a state where the temperature is high such as the condensation temperature, the temperature change due to the pressure loss does not occur. Since it is very small (about 1 to 2 ° C.), it can be realized at low cost by detecting the temperature on the pipe in the vicinity of the internal condenser 46 with a thermistor or the like.

  When the solenoid valve 52 in the bypass channel is closed, the coolant flows in the direction of the arrow through the thick coolant channel in FIG.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. When the refrigerant is flowing through the internal condenser 46, the internal fan 27 blows air to the internal condenser 46.

  The refrigerant exiting the internal condenser 46 is depressurized by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

  The refrigerant flowing out of the external condenser 40 flows from the three-way valve 42 to the expansion mechanism 44 side for the internal evaporator 9 because the solenoid valve 52 in the bypass flow path is closed. After being depressurized, the second cooling greenhouse 3 is cooled by evaporating with the internal evaporator 9. When the refrigerant is flowing through the internal evaporator 9, the internal fan 28 blows air to the internal evaporator 9.

  The excess liquid refrigerant that could not be evaporated by the internal evaporator 9 is evaporated by the internal evaporator 10 connected in series with the internal evaporator 9 to cool the cooling exclusive chamber 4 (series cooling operation). When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  Thereafter, when the temperature of the second cooling greenhouse 3 reaches the target temperature (the lower limit value of the cooling temperature range), the three-way valve 42 is switched so that the refrigerant flows into the expansion mechanism 45 for the internal evaporator 10. Thus, as shown in FIG. 6, only the internal evaporator 10 out of the internal evaporator 9 and the internal evaporator 10 is individually cooled (downstream side independent cooling operation).

  By performing the serial cooling operation preferentially in this way, the cooling exclusive chamber 4 is also cooled by the surplus liquid refrigerant, so that the operating rate of the downstream side single cooling operation can be reduced and the power consumption can be reduced. Can do.

  The gaseous refrigerant that has flowed out of the internal evaporator 10 returns to the compressor 5.

  If the discharge pressure of the compressor 5 drops to a predetermined compressor normal pressure (reopen pressure) lower than the compressor overload pressure after the solenoid valve 52 of the bypass passage is closed, the bypass passage The electromagnetic valve 52 is opened so that the refrigerant flows in the direction of the arrow in the thick refrigerant path of FIG.

  When the electromagnetic valve 52 of the bypass channel is opened, the heating capacity of the internal condenser 46 can be increased as compared with the case where the electromagnetic valve 52 is closed.

  When the solenoid valve 52 of the bypass flow path is opened, the refrigerant flows through the bypass flow path, so that the flow resistance of the refrigerant decreases, the circulation amount of the refrigerant increases, the evaporation temperature of the internal evaporators 9 and 10 increases, The condensation temperature of the condenser 46 increases. Therefore, the heating capability by the internal condenser 46 of the 1st cooling heating greenhouse 2 increases, and it can heat by the heat pump heating (heating by a cooling heating system) more efficient than the heating heater 30. .

  And a control means (not shown) maintains the room temperature of the 1st cooling heating chamber 2 in the preset heating temperature range, and each room | chamber interior of the 2nd cooling heating chamber 3 and the cooling exclusive room 4 is carried out. The three-way valve 57 and the three-way valve 42 are switched, and the operation of the compressor 5, the external fan 26, and the internal fans 27, 28, and 29 is controlled so that the temperature of the internal combustion engine is maintained within a preset cooling temperature range. ing.

  For example, when the first cooling greenhouse 2 is heated to a predetermined temperature (heating end temperature) that is the upper limit value of the heating temperature range, the flow of the three-way valve 42 to the expansion mechanism 44 for the internal evaporator 9 is performed. Either the passage (exit) or the flow path (exit) to the expansion mechanism 45 for the internal evaporator 10 is in an open state (the internal cooling 9 and the internal evaporator 10 cool the second cooling chamber 3 and Downstream side for cooling the cooling exclusive chamber 4 during the serial cooling operation for cooling both the product storage chambers of the exclusive chamber 4 or by the independent cooling of the internal evaporator 9 and the internal evaporator 10 alone. If the single cooling operation is in progress), the electromagnetic valve 52 in the bypass passage is closed and the internal fan 27 is stopped.

  Alternatively, in addition to closing the electromagnetic valve 52 and stopping the internal fan 27, as shown in FIG. 3, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the external condenser 40 communicate with each other.

  Here, the electromagnetic valve 52 of the bypass flow path is closed and the internal fan 27 is stopped, but when the three-way valve 57 is not in a state where the discharge pipe of the compressor 5 and the external condenser 40 are in communication with each other, By closing the solenoid valve 52 in the bypass flow path, the heating capacity of the first condenser room 2 by the internal condenser 46 is reduced, and when the internal fan 27 is stopped, the air in the first compartment 2 is cooled. And the amount of heat exchange between the refrigerator 46 and the internal condenser 46 are reduced.

In this case, most of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 cannot be condensed by the internal condenser 46 but is condensed by the external condenser 40. When it is necessary to sufficiently condense in the outside condenser 40, the amount of heat exchange between the outside condenser 40 and the outside air is increased by increasing the amount of air blown by the outside fan 26.

  Then, after closing the electromagnetic valve 52 of the bypass channel and stopping the internal fan 27, if the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range, the electromagnetic wave is again generated. The valve 52 is opened and the internal fan 27 is operated.

  As shown in FIG. 3, after switching the three-way valve 57 so that the refrigerant from the compressor 5 does not flow into the internal condenser 46, the temperature of the first cooling greenhouse 2 is the lower limit of the warming temperature range. If the temperature drops to a predetermined temperature, the three-way valve 57 is again connected to the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 in addition to the opening of the electromagnetic valve 52 and the operation of the internal fan 27. The communication state is returned to the state (shown in FIG. 7).

  In the state shown in FIG. 3, when the second cooling greenhouse 3 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, as shown in FIG. 4, the expansion mechanism 44 for the internal evaporator 9. The three-way valve 42 is switched to a state in which the flow path (exit) to the inlet is closed and the flow path (exit) to the expansion mechanism 45 for the internal evaporator 10 is opened, and the internal fan 28 is stopped. Further, if the temperature in the second cooling greenhouse 3 rises to a predetermined temperature that is the upper limit value of the cooling temperature range while the compressor 5 is stopped, the flow path to the expansion mechanism 44 for the internal evaporator 9 ( The three-way valve 42 is switched to a state in which the outlet) is opened and the flow path (exit) to the expansion mechanism 45 is closed, the electromagnetic valve 52 in the bypass flow path is closed, the compressor 5 is started, and the internal fan 28 To drive.

  Further, as shown in FIG. 4, the three-way valve 42 blocks the flow path (exit) to the expansion mechanism 44 for the internal evaporator 9, and the flow path (exit) to the expansion mechanism 45 for the internal evaporator 10. In the second cooling chamber 3 in the state where only the internal evaporator 10 of the internal evaporator 9 and the internal evaporator 10 is cooled alone (downstream single cooling operation). When the temperature rises to a predetermined temperature that is the upper limit value of the cooling temperature range, the flow path (exit) to the expansion mechanism 44 for the internal evaporator 9 is opened as shown in FIG. The three-way valve 42 is switched to a state in which the flow path (exit) to the expansion mechanism 45 is closed, and the internal fan 28 is operated.

  Further, as shown in FIG. 4, after the transition from the series cooling operation of the internal evaporator 9 and the internal evaporator 10 to the downstream single cooling operation of only the internal evaporator 10, the cooling dedicated chamber 4 is in the cooling temperature range. When the temperature is cooled to a predetermined temperature that is the lower limit value of the compressor, the three-way valve 42 stops the compressor 5 in addition to closing the refrigerant outlet on the expansion mechanism 45 side for the internal evaporator 10 and stopping the internal fan 29. .

  Further, as shown in FIG. 6, after the transition from the series cooling operation of the internal evaporator 9 and the internal evaporator 10 to the downstream single cooling operation of only the internal evaporator 10, the cooling dedicated chamber 4 is in the cooling temperature range. The three-way valve 57 is in a state where the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 are in communication with each other (the heating of the first cooling greenhouse 2). Is necessary and the refrigerant discharged from the compressor 5 flows into the internal condenser 46), the refrigerant outlet on the side of the expansion mechanism 45 for the internal evaporator 10 of the three-way valve 42 is blocked. In addition to the stop of the internal fan 29, either or both of the electromagnetic valve 52 and the electromagnetic valve 56 of the bypass flow path are opened, and the state shown in any of FIGS. By absorbing heat in either or both of the cold evaporator 54 and the cold condenser 54 in the warehouse, Continuing the first warming of the cooling heating chamber 2 by 6.

  At this time, when both the solenoid valve 52 and the solenoid valve 56 are opened and the heat is absorbed by both the outside evaporator 41 and the inside cold evaporator 54 shown in FIG. Compared to the state shown in FIG. 9 or FIG. 11 in which only one of the solenoid valves 56 is opened and heat is absorbed by either the outside evaporator 41 or the inside cold evaporator 54, the inside condenser 46 is used. The heating capability of the 1st cooling greenhouse 2 becomes high.

  Next, in the case of the cooling and heating operation in which the first cooling greenhouse 2 is heated by the internal condenser 46 and only the cooling exclusive chamber 4 is cooled among the second cooling greenhouse 3 and the exclusive cooling chamber 4. 6 is an operation in which the refrigerant flows in the direction of the arrow through the thick refrigerant passage in FIG.

  In the case of the cooling and heating operation in which the first cooling greenhouse 2 is heated by the internal condenser 46 and only the cooling exclusive chamber 4 is cooled out of the second cooling greenhouse 3 and the cooling exclusive chamber 4, a three-way valve 57, the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other, and the three-way valve 42 closes the flow path to the expansion mechanism 44 for the internal evaporator 9; The flow path to the expansion mechanism 45 for the internal evaporator 10 is opened, the electromagnetic valve 51, the electromagnetic valve 52, and the electromagnetic valve 56 are closed, and the compressor 5 is started.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. When the refrigerant is flowing through the internal condenser 46, the internal fan 27 blows air to the internal condenser 46.

  Then, the refrigerant exiting the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

  The refrigerant that has flowed out of the outside condenser 40 flows to the three-way valve 42 side because the solenoid valve 51, the solenoid valve 52, and the solenoid valve 56 are closed. The refrigerant that has flowed to the three-way valve 42 flows from the three-way valve 42 toward the expansion mechanism 45, and is decompressed by the expansion mechanism 45, and then evaporated and evaporated in the internal evaporator 10 to cool the cooling dedicated chamber 4. When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  The refrigerant flowing out of the internal evaporator 10 is separated into a gas refrigerant and a liquid refrigerant by the gas-liquid separator 59, and the gas refrigerant separated from the liquid refrigerant by the gas-liquid separator 59 is sucked into the compressor 5. It is.

  And a control means (not shown) maintains the indoor temperature of the 1st cooling greenhouse 2 in the preset heating temperature range, and the indoor temperature of the cooling exclusive room 4 is the preset cooling temperature range. The switching of the three-way valve 57 and the three-way valve 42 and the operation of the compressor 5, the external fan 26, and the internal fans 27 and 29 are controlled so as to maintain the inside.

  For example, if the cooling chamber 4 is being cooled by the internal evaporator 10 when the first cooling greenhouse 2 is heated to a predetermined temperature that is the upper limit value of the heating temperature range, the internal fan 27 is turned on. Stop. Alternatively, as shown in FIG. 4, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the external condenser 40 communicate with each other, and the internal fan 27 is stopped.

  After the internal fan 27 is stopped without switching the three-way valve 57, the internal fan 27 is operated if the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range.

  As shown in FIG. 4, after switching the three-way valve 57 so that the refrigerant from the compressor 5 does not flow into the internal condenser 46, the temperature of the first cooling greenhouse 2 becomes the lower limit value of the heating temperature range. When the temperature falls to the predetermined temperature, the three-way valve 57 is returned to the state where the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other as shown in FIG. To do.

Moreover, the cooling heating which heats the 1st cooling greenhouse 2 shown in FIG. 6 with the condenser 46 in a store | warehouse | chamber, and cools only the cooling exclusive chamber 4 among the 2nd cooling exclusive greenhouse 3 and the cooling exclusive chamber 4 is carried out. When the cooling exclusive chamber 4 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range during operation, the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 is closed and the internal fan 29 is stopped. In addition, either one or both of the electromagnetic valve 52 and the electromagnetic valve 56 in the bypass flow path are opened to the state shown in any of FIGS. Heating of the first cooling greenhouse 2 by the internal condenser 46 is continued by absorbing heat in one or both of the containers 54.

  At this time, when both the solenoid valve 52 and the solenoid valve 56 are opened and the heat is absorbed by both the outside evaporator 41 and the inside cold evaporator 54 shown in FIG. Compared to the state shown in FIG. 9 or FIG. 11 in which only one of the solenoid valves 56 is opened and heat is absorbed by either the outside evaporator 41 or the inside cold evaporator 54, the inside condenser 46 is used. The heating capability of the 1st cooling greenhouse 2 becomes high.

  In addition, when the 1st cooling greenhouse 2 is heated with the internal condenser 46, and the cooling heating operation which cools only the cooling exclusive chamber 4 among the 2nd cooling greenhouse 3 and the cooling exclusive chamber 4 is bypassed. When the electromagnetic valve 52 in the flow path is opened and heat is absorbed by the external evaporator 41 shown in FIG. 8, the storage is made more than in the state shown in FIG. 6 without opening the electromagnetic valve 52 in the bypass flow path. The amount of heat absorbed by the outer evaporator 41 increases the heating capacity of the first cooling greenhouse 2 by the internal condenser 46.

  In addition, when the 1st cooling greenhouse 2 is heated with the internal condenser 46, and the cooling heating operation which cools only the cooling exclusive room 4 among the 2nd cooling warming room 3 and the exclusive cooling room 4 is started. In the above, until the internal temperature of the first cooling chamber 2 reaches a predetermined internal upper limit temperature (heating end temperature) or until the discharge pressure of the compressor 5 reaches a predetermined compressor overload pressure, The cooling and heating operation may be started by opening the electromagnetic valve 52 of the bypass flow path so that the refrigerant flows in the direction of the arrow in the thick refrigerant flow path of FIG.

  In that case, when the discharge pressure of the compressor 5 reaches a predetermined compressor overload pressure, the solenoid valve 52 of the bypass flow path is closed, and the refrigerant passes through the thick refrigerant line of FIG. Make it flow in the direction.

  The solenoid valve 52 of the bypass flow path is opened and the cooling and heating operation is started so that the refrigerant flows in the direction of the arrow in the thick refrigerant flow path of FIG. 8, and the discharge pressure of the compressor 5 is set to a predetermined compressor. When the overload pressure is reached, the solenoid valve 52 in the bypass flow path is closed to flow in the thick refrigerant path in FIG. 6 in the direction of the arrow, and then the discharge pressure of the compressor 5 becomes the compressor overload. If the pressure is reduced to a predetermined compressor normal pressure (reopen pressure) lower than the pressure, the electromagnetic valve 52 of the bypass flow path is opened, and the refrigerant flows again in the direction of the arrow through the thick refrigerant path of FIG. Like that.

  More specifically, when starting the cooling and heating operation in which the first cooling greenhouse 2 is heated and only the cooling exclusive chamber 4 is cooled out of the second cooling exclusive greenhouse 3 and the exclusive cooling chamber 4, As shown in FIG. 8, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other, and the three-way valve 42 blocks the flow path to the expansion mechanism 44. The flow path to the expansion mechanism 45 is opened, the electromagnetic valve 51 and the electromagnetic valve 56 are closed, the electromagnetic valve 52 is opened, and the compressor 5 is started.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. When the refrigerant is flowing through the internal condenser 46, the internal fan 27 blows air to the internal condenser 46.

  The refrigerant exiting the internal condenser 46 is depressurized by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

  The refrigerant that has flowed out of the external condenser 40 flows from the three-way valve 42 to the expansion mechanism 45 side for the internal evaporator 10, and the refrigerant that branches to the bypass flow path and flows from the electromagnetic valve 52 to the expansion mechanism 53 side. Divided into

  The refrigerant that has flowed from the three-way valve 42 toward the expansion mechanism 45 for the internal evaporator 10 is decompressed by the expansion mechanism 45 and then evaporated and evaporated in the internal evaporator 10 to cool the cooling dedicated chamber 4 (downstream side). Single cooling operation). When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  On the other hand, the refrigerant branched into the bypass flow path and flowing from the electromagnetic valve 52 to the expansion mechanism 53 side is evaporated by the external evaporator 41 after being decompressed by the expansion mechanism 53.

  Then, the gaseous refrigerant that has flowed out of the internal evaporator 10 and the gaseous refrigerant that has flowed out of the external evaporator 41 merge and return to the compressor 5.

  Thereafter, if the discharge pressure of the compressor 5 reaches a predetermined compressor overload pressure, the solenoid valve 52 of the bypass flow path is closed.

  Here, examples of the discharge pressure detection means of the compressor 5 include a pressure sensor that is provided on the discharge pipe and directly measures the pressure of the refrigerant, a thermistor provided on the discharge pipe, and the like.

  However, the discharge pressure of the compressor 5 can be approximated by the piping temperature in the vicinity of the heat exchanger in the form of the condensation temperature, and in a state where the temperature is high such as the condensation temperature, the temperature change due to the pressure loss does not occur. Since it is very small (about 1 to 2 ° C.), it can be realized at low cost by detecting the temperature on the pipe in the vicinity of the internal condenser 46 with a thermistor or the like.

  When the solenoid valve 52 in the bypass channel is closed, the coolant flows in the direction of the arrow through the thick coolant channel in FIG.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. When the refrigerant is flowing through the internal condenser 46, the internal fan 27 blows air to the internal condenser 46.

  The refrigerant exiting the internal condenser 46 is depressurized by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

  The refrigerant that has flowed out of the external condenser 40 flows from the three-way valve 42 to the expansion mechanism 45 side of the internal evaporator 10 because the solenoid valve 52 of the bypass flow path is closed. After the pressure is reduced, the internal vaporizer 10 evaporates and cools the cooling chamber 4 (series cooling operation). When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  The gaseous refrigerant that has flowed out of the internal evaporator 10 returns to the compressor 5.

  If the discharge pressure of the compressor 5 drops to a predetermined compressor normal pressure (reopen pressure) lower than the compressor overload pressure after the solenoid valve 52 of the bypass passage is closed, the bypass passage The electromagnetic valve 52 is opened so that the refrigerant flows in the direction of the arrow in the thick refrigerant path of FIG.

  When the electromagnetic valve 52 of the bypass channel is opened, the heating capacity of the internal condenser 46 can be increased as compared with the case where the electromagnetic valve 52 is closed.

  When the solenoid valve 52 of the bypass flow path is opened, the refrigerant flows through the bypass flow path, so that the flow resistance of the refrigerant decreases, the circulation amount of the refrigerant increases, the evaporation temperature of the internal evaporator 10 increases, and the internal condenser The condensation temperature of 46 increases. Therefore, the heating capability by the internal condenser 46 of the 1st cooling heating greenhouse 2 increases, and it can heat by the heat pump heating (heating by a cooling heating system) more efficient than the heating heater 30. .

  And a control means (not shown) maintains the indoor temperature of the 1st cooling greenhouse 2 in the preset heating temperature range, and the indoor temperature of the cooling exclusive room 4 is the preset cooling temperature range. The switching of the three-way valve 57 and the three-way valve 42 and the operation of the compressor 5, the external fan 26, and the internal fans 27 and 29 are controlled so as to maintain the inside.

  For example, when the first cooling greenhouse 2 is heated to a predetermined temperature (heating end temperature) that is the upper limit value of the heating temperature range, the internal evaporator 9 and the internal evaporator 10 are the internal evaporator. If the downstream single cooling operation for cooling the cooling exclusive chamber 4 with only 10 single cooling is in progress, the electromagnetic valve 52 in the bypass flow path is closed and the internal fan 27 is stopped.

  Alternatively, in addition to closing the electromagnetic valve 52 and stopping the internal fan 27, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the external condenser 40 communicate with each other as shown in FIG.

  Here, the electromagnetic valve 52 of the bypass flow path is closed and the internal fan 27 is stopped, but when the three-way valve 57 is not in a state where the discharge pipe of the compressor 5 and the external condenser 40 are in communication with each other, By closing the solenoid valve 52 in the bypass flow path, the heating capacity of the first condenser room 2 by the internal condenser 46 is reduced, and when the internal fan 27 is stopped, the air in the first compartment 2 is cooled. And the amount of heat exchange between the refrigerator 46 and the internal condenser 46 are reduced.

  In this case, most of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 cannot be condensed by the internal condenser 46 but is condensed by the external condenser 40. When it is necessary to sufficiently condense in the outside condenser 40, the amount of heat exchange between the outside condenser 40 and the outside air is increased by increasing the amount of air blown by the outside fan 26.

  Then, after closing the electromagnetic valve 52 of the bypass channel and stopping the internal fan 27, if the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range, the electromagnetic wave is again generated. The valve 52 is opened and the internal fan 27 is operated.

  As shown in FIG. 4, after switching the three-way valve 57 so that the refrigerant from the compressor 5 does not flow into the internal condenser 46, the temperature of the first cooling greenhouse 2 is the lower limit of the heating temperature range. If the temperature drops to a predetermined temperature, the three-way valve 57 is again connected to the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 in addition to the opening of the electromagnetic valve 52 and the operation of the internal fan 27. The communication state (state shown in FIG. 8) is restored.

  In the state shown in FIG. 4, when the cooling chamber 4 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the refrigerant outlet on the expansion mechanism 45 side of the internal evaporator 10 of the three-way valve 42 In addition to closing and stopping the internal fan 29, the compressor 5 is stopped.

Further, in the state shown in FIG. 6, when the cooling exclusive chamber 4 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the first cooling greenhouse 2 needs to be heated (the first cooling heating chamber 2). If the internal chamber temperature is less than the predetermined internal upper limit temperature (heating end temperature), the refrigerant outlet on the side of the expansion mechanism 45 for the internal evaporator 10 of the three-way valve 42 is closed and the internal fan 29 is stopped. In addition, either one or both of the electromagnetic valve 52 and the electromagnetic valve 56 in the bypass flow path are opened to the state shown in any of FIGS. Heating of the first cooling greenhouse 2 by the internal condenser 46 is continued by absorbing heat in one or both of the containers 54.

  At this time, when both the solenoid valve 52 and the solenoid valve 56 are opened and the heat is absorbed by both the outside evaporator 41 and the inside cold evaporator 54 shown in FIG. Compared to the state shown in FIG. 9 or FIG. 11 in which only one of the solenoid valves 56 is opened and heat is absorbed by either the outside evaporator 41 or the inside cold evaporator 54, the inside condenser 46 is used. The heating capability of the 1st cooling greenhouse 2 becomes high.

  Next, the first cooling greenhouse 2 is heated by the internal condenser 46, but the heating operation (first cooling greenhouse) in which neither the second cooling greenhouse 3 nor the cooling exclusive chamber 4 is cooled. In the case of the heating operation only for heating 2), the state shown in any of FIGS.

  At this time, when both the solenoid valve 52 and the solenoid valve 56 are opened and the heat is absorbed by both the outside evaporator 41 and the inside cold evaporator 54 shown in FIG. Compared to the state shown in FIG. 9 or FIG. 11 in which only one of the solenoid valves 56 is opened and heat is absorbed by either the outside evaporator 41 or the inside cold evaporator 54, the inside condenser 46 is used. The heating capability of the 1st cooling greenhouse 2 becomes high.

  In the case of the operation in which the refrigerant flows in the direction of the arrow in the thick refrigerant passage in FIG. 9, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other. The electromagnetic valve 51 is closed so that the refrigerant does not flow into the expansion mechanism 43 for the internal evaporator 47, and the flow path (exit) of the three-way valve 42 to the expansion mechanism 44 for the internal evaporator 9 and the internal evaporation. All the flow paths (outlets) of the flow path (exit) to the expansion mechanism 45 for the container 10 are closed, the electromagnetic valve 52 of the bypass flow path is opened, the electromagnetic valve 56 is closed, and the compressor 5 is started. Then, the outside fan 26 and the inside fan 27 are operated.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. The refrigerant that has exited the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40.

  The refrigerant that has flowed out of the outside condenser 40 has the two outlets of the three-way valve 42, the electromagnetic valve 51 and the electromagnetic valve 56 closed, and the electromagnetic valve 52 is opened. They do not flow into the inner weak evaporator 54 but all flow toward the bypass flow path.

  Then, it passes through the electromagnetic valve 52 in the bypass flow path, is decompressed by the expansion mechanism 53, evaporates in the external evaporator 41, and returns to the compressor 5.

  And if the 1st cooling greenhouse 2 is heated to the predetermined temperature used as the upper limit of a heating temperature range, a control means (not shown) will be the compressor 5, the external fan 26, and an internal fan. When the compressor 5, the outside fan 26, and the inside fan 27 are stopped, the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range. (Not shown) operates the compressor 5, the external fan 26, and the internal fan 27.

In the case of the operation in which the refrigerant flows in the direction of the arrow in the thick refrigerant passage in FIG. 10, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other. The electromagnetic valve 51 is closed so that the refrigerant does not flow into the expansion mechanism 43 for the internal evaporator 47, and the flow path (exit) of the three-way valve 42 to the expansion mechanism 44 for the internal evaporator 9 and the internal evaporation. All the flow paths (outlets) of the flow path (exit) to the expansion mechanism 45 for the container 10 are closed, the electromagnetic valves 52 and 56 of the bypass flow paths are opened, the compressor 5 is started, The external fan 26 and the internal fan 27 are operated.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. The refrigerant that has exited the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40.

  The refrigerant that has flowed out of the outside condenser 40 has the two outlets of the three-way valve 42 and the electromagnetic valve 51 closed, and the electromagnetic valve 52 and the electromagnetic valve 56 are opened. It does not flow but all flows to the bypass flow path side.

  A part of the refrigerant flowing in the bypass flow path passes through the electromagnetic valve 52, is decompressed by the expansion mechanism 53, evaporates and evaporates in the external evaporator 41, and returns to the compressor 5. Further, the remaining refrigerant flowing in the bypass flow path passes through the electromagnetic valve 56, is depressurized by the expansion mechanism 55, evaporates and vaporizes in the internal cold evaporator 54, and is compressed through the gas-liquid separator 59. Reflux to machine 5.

  And if the 1st cooling greenhouse 2 is heated to the predetermined temperature used as the upper limit of a heating temperature range, a control means (not shown) will be the compressor 5, the external fan 26, and an internal fan. When the compressor 5, the outside fan 26, and the inside fan 27 are stopped, the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range. (Not shown) operates the compressor 5, the external fan 26, and the internal fan 27.

  In the case of the operation in which the refrigerant flows in the direction of the arrow in the thick refrigerant passage in FIG. 11, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other. The electromagnetic valve 51 is closed so that the refrigerant does not flow into the expansion mechanism 43 for the internal evaporator 47, and the flow path (exit) of the three-way valve 42 to the expansion mechanism 44 for the internal evaporator 9 and the internal evaporation. All the flow paths (outlets) of the flow path (exit) to the expansion mechanism 45 for the container 10 are closed, the electromagnetic valve 52 of the bypass flow path is closed, the electromagnetic valve 56 is opened, and the compressor 5 is started. The outside fan 26 and the inside fan 27 are operated.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. The refrigerant that has exited the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40.

  The refrigerant that has flowed out of the outside condenser 40 has two outlets of the three-way valve 42, the electromagnetic valve 51 and the electromagnetic valve 52 closed, and the electromagnetic valve 56 is opened. It does not flow to the outer evaporator 41, passes through the electromagnetic valve 56 from the bypass flow path, is depressurized by the expansion mechanism 55, evaporates and vaporizes in the internal cold evaporator 54, and passes through the gas-liquid separator 59. Reflux to the compressor 5.

  And if the 1st cooling greenhouse 2 is heated to the predetermined temperature used as the upper limit of a heating temperature range, a control means (not shown) will be the compressor 5, the external fan 26, and an internal fan. When the compressor 5, the outside fan 26, and the inside fan 27 are stopped, the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range. (Not shown) operates the compressor 5, the external fan 26, and the internal fan 27.

  Next, the first cooling greenhouse 2 is heated by the internal condenser 46, the second cooling greenhouse 3 is heated by the heating heater 31, and the cooling exclusive heating chamber 4 is cooled. In this case, the refrigerant flows in the direction of the arrow in the thick refrigerant passage in FIG. 12 and the heating heater 31 is energized.

  In the case of the cooling and heating operation in which the first cooling greenhouse 2 is heated by the internal condenser 46, the second cooling greenhouse 3 is heated by the heating heater 31, and the cooling exclusive chamber 4 is cooled. The three-way valve 57 is brought into communication between the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46, and the three-way valve 42 blocks the flow path to the expansion mechanism 44 for the internal evaporator 9. Then, the flow path to the expansion mechanism 45 for the internal evaporator 10 is opened, the electromagnetic valve 51, the electromagnetic valve 52, and the electromagnetic valve 56 are closed, and the compressor 5 is started. Further, the heating heater 31 is energized.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. When the refrigerant is flowing through the internal condenser 46, the internal fan 27 blows air to the internal condenser 46.

  Then, the refrigerant exiting the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

  The refrigerant that has flowed out of the outside condenser 40 flows to the three-way valve 42 side because the solenoid valve 51, the solenoid valve 52, and the solenoid valve 56 are closed. The refrigerant that has flowed to the three-way valve 42 flows from the three-way valve 42 toward the expansion mechanism 45, and is decompressed by the expansion mechanism 45, and then evaporated and evaporated in the internal evaporator 10 to cool the cooling dedicated chamber 4. When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  The refrigerant flowing out of the internal evaporator 10 is separated into a gas refrigerant and a liquid refrigerant by the gas-liquid separator 59, and the gas refrigerant separated from the liquid refrigerant by the gas-liquid separator 59 is sucked into the compressor 5. It is.

  Further, when the warming heater 31 is energized, the warming heater 31 warms the inside of the second cooling greenhouse 3 and the internal fan 28 blows air to the warming heater 31.

  And a control means (not shown) maintains the indoor temperature of the 1st cooling greenhouse 2 and the 2nd cooling greenhouse 3 in the preset heating temperature range, and the indoor temperature of the cooling exclusive room 4 is set. Are switched between the three-way valve 57 and the three-way valve 42 and the compressor 5, the external fan 26, the internal fans 27, 28 and 29 are operated, and the heating heater 31. Is controlled.

  For example, if the cooling chamber 4 is being cooled by the internal evaporator 10 when the first cooling greenhouse 2 is heated to a predetermined temperature that is the upper limit value of the heating temperature range, the internal fan 27 is turned on. Stop. Alternatively, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the external condenser 40 communicate with each other, and the internal fan 27 is stopped.

  After the internal fan 27 is stopped without switching the three-way valve 57, the internal fan 27 is operated if the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range.

  After the three-way valve 57 is switched so that the refrigerant from the compressor 5 does not flow into the internal condenser 46 from the state shown in FIG. 12, the temperature of the first cooling greenhouse 2 becomes the lower limit value of the heating temperature range. 12, the three-way valve 57 is again returned to the state in which the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other as shown in FIG. drive.

  Further, as shown in FIG. 12, the first cooling greenhouse 2 is heated by the internal condenser 46, the second cooling greenhouse 3 is heated by the heating heater 31, and the cooling exclusive chamber 4 is cooled. When the second cooling greenhouse 3 is heated to a predetermined temperature that is the upper limit value of the heating temperature range during the heating operation, the temperature of the second cooling greenhouse 3 is within the heating temperature range. The energization of the heater 31 is stopped until the temperature reaches a predetermined temperature that is the lower limit.

  Further, as shown in FIG. 12, the first cooling greenhouse 2 is heated by the internal condenser 46, the second cooling greenhouse 3 is heated by the heating heater 31, and the cooling exclusive chamber 4 is cooled. When the cooling exclusive chamber 4 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range during the heating operation, the refrigerant outlet is closed on the expansion mechanism 45 side of the three-way valve 42 and the internal fan 29 In addition to stopping the operation, either one or both of the solenoid valve 52 and the solenoid valve 56 in the bypass flow path are opened, and heat is absorbed by one or both of the outside evaporator 41 and the inside cold evaporator 54. Thus, the heating of the first cooling greenhouse 2 by the internal condenser 46 is continued.

  At this time, when both the electromagnetic valve 52 and the electromagnetic valve 56 are opened and heat is absorbed by both the external evaporator 41 and the internal cold evaporator 54, one of the electromagnetic valve 52 and the electromagnetic valve 56 is used. The heating capacity of the first cooling greenhouse 2 by the in-compartment condenser 46 is higher than that in the case where only one of the outside evaporator 41 and the in-compartment weakly-cooled evaporator 54 absorbs heat. Get higher.

  The first cooling greenhouse 2 is heated by the internal condenser 46, the second cooling greenhouse 3 is heated by the heating heater 31, and the cooling heating operation for cooling the cooling exclusive chamber 4 is performed. When the electromagnetic valve 52 in the bypass flow path is opened and heat is absorbed by the outside evaporator 41 shown in FIG. 13, the electromagnetic valve 52 in the bypass flow path is not opened and the state shown in FIG. As the heat is absorbed by the outside evaporator 41, the heating capacity of the first cooling greenhouse 2 by the inside condenser 46 is increased.

  The first cooling greenhouse 2 is heated by the internal condenser 46, the second cooling greenhouse 3 is heated by the heating heater 31, and the cooling and heating operation for cooling the cooling exclusive chamber 4 is started. In this case, until the internal temperature of the first cooling greenhouse 2 reaches a predetermined internal upper limit temperature (heating end temperature) or until the discharge pressure of the compressor 5 reaches a predetermined compressor overload pressure. The cooling and heating operation may be started by opening the electromagnetic valve 52 in the bypass flow path so that the refrigerant flows in the direction of the arrow in the thick refrigerant path in FIG.

  In that case, when the discharge pressure of the compressor 5 reaches a predetermined compressor overload pressure, the solenoid valve 52 of the bypass flow path is closed, and the refrigerant passes through the thick refrigerant path of FIG. Make it flow in the direction.

  The electromagnetic valve 52 of the bypass flow path is opened, and the cooling and heating operation is started so that the refrigerant flows in the direction of the arrow in the thick refrigerant flow path of FIG. 13, and the discharge pressure of the compressor 5 is a predetermined compressor. When the overload pressure is reached, the solenoid valve 52 of the bypass flow path is closed and the refrigerant flow path shown in FIG. 12 flows in the direction of the arrow, and then the discharge pressure of the compressor 5 is changed to the compressor overload. If the pressure is reduced to a predetermined compressor normal pressure (reopen pressure) lower than the pressure, the electromagnetic valve 52 of the bypass flow path is opened, and the refrigerant again flows in the direction of the arrow through the thick refrigerant path of FIG. Like that.

More specifically, when the first cooling / heating chamber 2 is heated, the second cooling / heating chamber 3 is heated by the heating heater 31, and the cooling / heating operation for cooling the cooling chamber 4 is started. As shown in FIG. 13, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other, and the three-way valve 42 provides a flow path to the expansion mechanism 44. The electromagnetic valve 51 and the electromagnetic valve 56 are closed, the electromagnetic valve 52 is opened, and the compressor 5 is started. Further, the heating heater 31 is energized. Note that, when the heating heater 31 is energized, the internal fan 28 blows air to the heating heater 31.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. When the refrigerant is flowing through the internal condenser 46, the internal fan 27 blows air to the internal condenser 46.

  The refrigerant exiting the internal condenser 46 is depressurized by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

  The refrigerant that has flowed out of the external condenser 40 flows from the three-way valve 42 to the expansion mechanism 45 side for the internal evaporator 10, and the refrigerant that branches to the bypass flow path and flows from the electromagnetic valve 52 to the expansion mechanism 53 side. Divided into

  The refrigerant that has flowed from the three-way valve 42 toward the expansion mechanism 45 for the internal evaporator 10 is decompressed by the expansion mechanism 45 and then evaporated and evaporated in the internal evaporator 10 to cool the cooling dedicated chamber 4 (downstream side). Single cooling operation). When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  On the other hand, the refrigerant branched into the bypass flow path and flowing from the electromagnetic valve 52 to the expansion mechanism 53 side is evaporated by the external evaporator 41 after being decompressed by the expansion mechanism 53.

  Then, the gaseous refrigerant that has flowed out of the internal evaporator 10 and the gaseous refrigerant that has flowed out of the external evaporator 41 merge and return to the compressor 5.

  Thereafter, if the discharge pressure of the compressor 5 reaches a predetermined compressor overload pressure, the solenoid valve 52 of the bypass flow path is closed.

  Here, examples of the discharge pressure detection means of the compressor 5 include a pressure sensor that is provided on the discharge pipe and directly measures the pressure of the refrigerant, a thermistor provided on the discharge pipe, and the like.

  However, the discharge pressure of the compressor 5 can be approximated by the piping temperature in the vicinity of the heat exchanger in the form of the condensation temperature, and in a state where the temperature is high such as the condensation temperature, the temperature change due to the pressure loss does not occur. Since it is very small (about 1 to 2 ° C.), it can be realized at low cost by detecting the temperature on the pipe in the vicinity of the internal condenser 46 with a thermistor or the like.

  When the solenoid valve 52 in the bypass channel is closed, the coolant flows in the direction of the arrow through the thick coolant channel in FIG.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. When the refrigerant is flowing through the internal condenser 46, the internal fan 27 blows air to the internal condenser 46.

  The refrigerant exiting the internal condenser 46 is depressurized by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40.

Since the refrigerant that has flowed out of the external condenser 40 is closed by the solenoid valve 52 of the bypass flow path,
All flow from the three-way valve 42 to the expansion mechanism 45 side of the internal evaporator 10, and after the pressure is reduced by the expansion mechanism 45, the internal evaporator 10 evaporates and cools the cooling exclusive chamber 4 (series cooling operation). ). When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  The gaseous refrigerant that has flowed out of the internal evaporator 10 returns to the compressor 5.

  If the discharge pressure of the compressor 5 drops to a predetermined compressor normal pressure (reopen pressure) lower than the compressor overload pressure after the solenoid valve 52 of the bypass passage is closed, the bypass passage The solenoid valve 52 is opened so that the refrigerant flows in the direction of the arrow in the refrigerant flow path indicated by the thick line in FIG.

  When the electromagnetic valve 52 of the bypass channel is opened, the heating capacity of the internal condenser 46 can be increased as compared with the case where the electromagnetic valve 52 is closed.

  When the solenoid valve 52 of the bypass flow path is opened, the refrigerant flows through the bypass flow path, so that the flow resistance of the refrigerant decreases, the circulation amount of the refrigerant increases, the evaporation temperature of the internal evaporator 10 increases, and the internal condenser The condensation temperature of 46 increases. Therefore, the heating capability by the internal condenser 46 of the 1st cooling heating greenhouse 2 increases, and it can heat by the heat pump heating (heating by a cooling heating system) more efficient than the heating heater 30. .

  And a control means (not shown) maintains the indoor temperature of the 1st cooling greenhouse 2 and the 2nd cooling greenhouse 3 in the preset heating temperature range, and the indoor temperature of the cooling exclusive room 4 is set. Are switched between the three-way valve 57 and the three-way valve 42 and the compressor 5, the external fan 26, the internal fans 27, 28 and 29 are operated, and the heating heater 31. Is controlled.

  For example, when the first cooling greenhouse 2 is heated to a predetermined temperature (heating end temperature) that is the upper limit value of the heating temperature range, the internal evaporator 9 and the internal evaporator 10 are the internal evaporator. If the downstream single cooling operation for cooling the cooling exclusive chamber 4 with only 10 single cooling is in progress, the electromagnetic valve 52 in the bypass flow path is closed and the internal fan 27 is stopped.

  Alternatively, in addition to closing the electromagnetic valve 52 and stopping the internal fan 27, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the external condenser 40 are in communication.

  Here, the electromagnetic valve 52 of the bypass flow path is closed and the internal fan 27 is stopped, but when the three-way valve 57 is not in a state where the discharge pipe of the compressor 5 and the external condenser 40 are in communication with each other, By closing the solenoid valve 52 in the bypass flow path, the heating capacity of the first condenser room 2 by the internal condenser 46 is reduced, and when the internal fan 27 is stopped, the air in the first compartment 2 is cooled. And the amount of heat exchange between the refrigerator 46 and the internal condenser 46 are reduced.

  In this case, most of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 cannot be condensed by the internal condenser 46 but is condensed by the external condenser 40. When it is necessary to sufficiently condense in the outside condenser 40, the amount of heat exchange between the outside condenser 40 and the outside air is increased by increasing the amount of air blown by the outside fan 26.

  Then, after closing the electromagnetic valve 52 of the bypass channel and stopping the internal fan 27, if the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range, the electromagnetic wave is again generated. The valve 52 is opened and the internal fan 27 is operated.

If the three-way valve 57 is switched so that the refrigerant from the compressor 5 does not flow into the internal condenser 46, the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range. Then, in addition to the opening of the electromagnetic valve 52 and the operation of the internal fan 27, the three-way valve 57 is again connected to the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 (see FIG. 13). Return to the state shown).

  Further, in the state where the discharge pipe of the compressor 5 and the external condenser 40 communicate with each other, when the cooling exclusive chamber 4 is cooled to a predetermined temperature which is the lower limit value of the cooling temperature range, the internal evaporator of the three-way valve 42 is used. In addition to closing the refrigerant outlet on the expansion mechanism 45 side for 10 and stopping the internal fan 29, the compressor 5 is stopped.

  Further, in the state shown in FIG. 12, when the cooling exclusive chamber 4 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the first cooling greenhouse 2 needs to be heated (the first cooling heating chamber 2). If the internal chamber temperature is less than the predetermined internal upper limit temperature (heating end temperature), the refrigerant outlet on the side of the expansion mechanism 45 for the internal evaporator 10 of the three-way valve 42 is closed and the internal fan 29 is stopped. In addition, either one or both of the electromagnetic valve 52 and the electromagnetic valve 56 in the bypass flow path are opened to the state shown in any of FIGS. Heating of the first cooling greenhouse 2 by the internal condenser 46 is continued by absorbing heat in one or both of the containers 54.

  At this time, when both the electromagnetic valve 52 and the electromagnetic valve 56 are opened and the heat is absorbed by both the external evaporator 41 and the internal cold evaporator 54 shown in FIG. Compared to the state shown in FIG. 14 or FIG. 16 in which only one of the solenoid valves 56 is opened and the outside evaporator 41 or the inside cold evaporator 54 absorbs heat, the inside condenser 46 is used. The heating capability of the 1st cooling greenhouse 2 becomes high.

  Next, the first cooling greenhouse 2 is heated by the internal condenser 46, and the second cooling greenhouse 3 is heated by the heating heater 31, but the cooling exclusive chamber 4 is not cooled. In this case, the state shown in any of FIGS.

  At this time, when both the electromagnetic valve 52 and the electromagnetic valve 56 are opened and the heat is absorbed by both the external evaporator 41 and the internal cold evaporator 54 shown in FIG. Compared to the state shown in FIG. 14 or FIG. 16 in which only one of the solenoid valves 56 is opened and the outside evaporator 41 or the inside cold evaporator 54 absorbs heat, the inside condenser 46 is used. The heating capability of the 1st cooling greenhouse 2 becomes high.

  In the case of the operation in which the refrigerant flows in the direction of the arrow in the thick refrigerant flow path of FIG. 14, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other. The electromagnetic valve 51 is closed so that the refrigerant does not flow into the expansion mechanism 43 for the internal evaporator 47, and the flow path (exit) of the three-way valve 42 to the expansion mechanism 44 for the internal evaporator 9 and the internal evaporation. All the flow paths (outlets) of the flow path (exit) to the expansion mechanism 45 for the container 10 are closed, the electromagnetic valve 52 of the bypass flow path is opened, the electromagnetic valve 56 is closed, and the compressor 5 is started. Then, the heating heater 31 is energized, and the outside fan 26 and the inside fans 27 and 28 are operated.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. The refrigerant that has exited the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40.

  The refrigerant that has flowed out of the outside condenser 40 has the two outlets of the three-way valve 42, the electromagnetic valve 51 and the electromagnetic valve 56 closed, and the electromagnetic valve 52 is opened. They do not flow into the inner weak evaporator 54 but all flow toward the bypass flow path.

  Then, it passes through the electromagnetic valve 52 in the bypass flow path, is decompressed by the expansion mechanism 53, evaporates in the external evaporator 41, and returns to the compressor 5.

  And if the 1st cooling greenhouse 2 is heated to the predetermined temperature used as the upper limit of a heating temperature range, a control means (not shown) will be the compressor 5, the external fan 26, and an internal fan. When the compressor 5, the outside fan 26, and the inside fan 27 are stopped, the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range. (Not shown) operates the compressor 5, the external fan 26, and the internal fan 27.

  Further, when the second cooling greenhouse 3 is heated to a predetermined temperature that is the upper limit value of the heating temperature range, the control means (not shown) stops energization of the heating heater 31 and warms up. When the heater 31 is not energized, when the temperature of the second cooling greenhouse 3 is lowered to a predetermined temperature that is the lower limit value of the heating temperature range, the control means (not shown) again turns on the heating heater. 31 is energized.

  In the case of the operation in which the refrigerant flows in the direction of the arrow in the thick refrigerant passage in FIG. 15, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other. The electromagnetic valve 51 is closed so that the refrigerant does not flow into the expansion mechanism 43 for the internal evaporator 47, and the flow path (exit) of the three-way valve 42 to the expansion mechanism 44 for the internal evaporator 9 and the internal evaporation. All the flow paths (outlets) of the flow path (exit) to the expansion mechanism 45 for the container 10 are closed, the electromagnetic valves 52 and 56 of the bypass flow paths are opened, the compressor 5 is started, The heater 31 is energized, and the external fan 26 and internal fans 27 and 28 are operated.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. The refrigerant that has exited the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40.

  The refrigerant that has flowed out of the outside condenser 40 has the two outlets of the three-way valve 42 and the electromagnetic valve 51 closed, and the electromagnetic valve 52 and the electromagnetic valve 56 are opened. It does not flow but all flows to the bypass flow path side.

  A part of the refrigerant flowing in the bypass flow path passes through the electromagnetic valve 52, is decompressed by the expansion mechanism 53, evaporates and evaporates in the external evaporator 41, and returns to the compressor 5. Further, the remaining refrigerant flowing in the bypass flow path passes through the electromagnetic valve 56, is depressurized by the expansion mechanism 55, evaporates and vaporizes in the internal cold evaporator 54, and is compressed through the gas-liquid separator 59. Reflux to machine 5.

  And if the 1st cooling greenhouse 2 is heated to the predetermined temperature used as the upper limit of a heating temperature range, a control means (not shown) will be the compressor 5, the external fan 26, and an internal fan. When the compressor 5, the outside fan 26, and the inside fan 27 are stopped, the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range. (Not shown) operates the compressor 5, the external fan 26, and the internal fan 27.

  Further, when the second cooling greenhouse 3 is heated to a predetermined temperature that is the upper limit value of the heating temperature range, the control means (not shown) stops energization of the heating heater 31 and warms up. When the heater 31 is not energized, when the temperature of the second cooling greenhouse 3 is lowered to a predetermined temperature that is the lower limit value of the heating temperature range, the control means (not shown) again turns on the heating heater. 31 is energized.

In the case of the operation in which the refrigerant flows in the direction of the arrow in the thick line refrigerant flow path of FIG. 16, the three-way valve 57 is brought into a state where the discharge pipe of the compressor 5 and the refrigerant inlet of the internal condenser 46 communicate with each other. The electromagnetic valve 51 is closed so that the refrigerant does not flow into the expansion mechanism 43 for the internal evaporator 47, and the flow path (exit) of the three-way valve 42 to the expansion mechanism 44 for the internal evaporator 9 and the internal evaporation. All the flow paths (outlets) of the flow path (exit) to the expansion mechanism 45 for the container 10 are closed, the electromagnetic valve 52 of the bypass flow path is closed, the electromagnetic valve 56 is opened, and the compressor 5 is started. Then, the heating heater 31 is energized, and the outside fan 26 and the inside fans 27 and 28 are operated.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and then goes to the internal condenser 46, where it is partially condensed by the internal condenser 46, and in this case, the internal condensation is performed. The inside of the first cooling greenhouse 2 is heated by radiating heat to the air around the vessel 46. The refrigerant that has exited the internal condenser 46 is decompressed by the expansion mechanism 48, passes through the check valve 58, and is further condensed by the external condenser 40.

  The refrigerant that has flowed out of the outside condenser 40 has two outlets of the three-way valve 42, the electromagnetic valve 51 and the electromagnetic valve 52 closed, and the electromagnetic valve 56 is opened. It does not flow to the outer evaporator 41, passes through the electromagnetic valve 56 from the bypass flow path, is depressurized by the expansion mechanism 55, evaporates and vaporizes in the internal cold evaporator 54, and passes through the gas-liquid separator 59. Reflux to the compressor 5.

  And if the 1st cooling greenhouse 2 is heated to the predetermined temperature used as the upper limit of a heating temperature range, a control means (not shown) will be the compressor 5, the external fan 26, and an internal fan. When the compressor 5, the outside fan 26, and the inside fan 27 are stopped, the temperature of the first cooling greenhouse 2 decreases to a predetermined temperature that is the lower limit value of the heating temperature range. (Not shown) operates the compressor 5, the external fan 26, and the internal fan 27.

  Further, when the second cooling greenhouse 3 is heated to a predetermined temperature that is the upper limit value of the heating temperature range, the control means (not shown) stops energization of the heating heater 31 and warms up. When the heater 31 is not energized, when the temperature of the second cooling greenhouse 3 is lowered to a predetermined temperature that is the lower limit value of the heating temperature range, the control means (not shown) again turns on the heating heater. 31 is energized.

  Next, in the cooling operation in which the first cooling greenhouse 2 is heated by the heating heater 30 and the second cooling greenhouse 3 and the cooling exclusive chamber 4 are cooled, the thick-line refrigerant flow path in FIG. The refrigerant flows in the direction of the arrow.

  In the cooling operation in which the first cooling greenhouse 2 is heated by the heater 30 and the second cooling greenhouse 3 and the cooling exclusive chamber 4 are cooled, the three-way valve 57 is connected to the discharge pipe of the compressor 5. The three-way valve 42 opens the flow path to the expansion mechanism 44 for the internal evaporator 9 and opens the flow path to the expansion mechanism 45 for the internal evaporator 10. The electromagnetic valve 51, the electromagnetic valve 52, and the electromagnetic valve 56 are closed, and the compressor 5 is started. Further, the heating heater 30 is energized. In addition, when the heating heater 30 is energized, the internal fan 27 blows air to the internal evaporator 47.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and is cooled and condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40. The refrigerant condensed in the outside condenser 40 flows from the three-way valve 42 to the expansion mechanism 44 side, and after being decompressed by the expansion mechanism 44, the refrigerant is evaporated and evaporated in the internal evaporator 9 to cool the second cooling greenhouse 3. To do. When the refrigerant is flowing through the internal evaporator 9, the internal fan 28 blows air to the internal evaporator 9.

The excess liquid refrigerant that could not be evaporated by the internal evaporator 9 is evaporated by the internal evaporator 10 connected in series with the internal evaporator 9 to cool the cooling exclusive chamber 4 (series cooling operation). . When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  Thereafter, when the temperature of the second cooling greenhouse 3 reaches the target temperature (the lower limit value of the cooling temperature range), the three-way valve 42 is switched so that the refrigerant flows from the three-way valve 42 to the expansion mechanism 45. By performing an operation in which the refrigerant flows through the 18 thick line refrigerant flow in the direction of the arrow, only the internal evaporator 10 of the internal evaporator 9 and the internal evaporator 10 is cooled alone (downstream independent cooling). operation).

  By performing the serial cooling operation preferentially in this way, the cooling exclusive chamber 4 is also cooled by the surplus liquid refrigerant, so that the operating rate of the downstream side single cooling operation can be reduced and the power consumption can be reduced. Can do.

  The refrigerant flowing out of the internal evaporator 10 is separated into a gas refrigerant and a liquid refrigerant by the gas-liquid separator 59, and the gas refrigerant separated from the liquid refrigerant by the gas-liquid separator 59 is sucked into the compressor 5. It is.

  Then, the control means (not shown) switches and compresses the three-way valve 42 so that the temperature in each of the second cooling greenhouse 3 and the cooling exclusive chamber 4 is maintained within a preset cooling temperature range. The operation of the machine 5, the outside fan 26, and the inside fans 28 and 29 is controlled. In addition, the energization of the heating heater 30 is controlled so that the room temperature of the first cooling greenhouse 2 is maintained within a preset heating temperature range.

  Further, when the second cooling chamber 3 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the three-way valve is brought into a state in which the flow path to the expansion mechanism 44 is closed and the flow path to the expansion mechanism 45 is opened. 42 is switched and the internal fan 28 is stopped. If the temperature in the second cooling greenhouse 3 rises to a predetermined temperature that is the upper limit value of the cooling temperature range while the compressor 5 is stopped, the flow path to the expansion mechanism 44 is opened and the expansion mechanism 45 is connected. The three-way valve 42 is switched to a state in which the flow path is closed, the compressor 5 is started, and the internal fan 28 is operated.

  Further, the three-way valve 42 closes the flow path to the expansion mechanism 44 and opens the flow path to the expansion mechanism 45 so that only the internal evaporator 10 out of the internal evaporator 9 and the internal evaporator 10 is cooled alone. When the temperature in the second cooling greenhouse 3 rises to a predetermined temperature that is the upper limit value of the cooling temperature range in the state where the downstream single cooling operation is performed, the flow path to the expansion mechanism 44 is opened. The internal fan 28 is operated by switching the three-way valve 42 to a state in which the flow path to the expansion mechanism 45 is closed.

  In addition, after the transition from the series cooling operation of the internal evaporator 9 and the internal evaporator 10 to the downstream single cooling operation of only the internal evaporator 10, the predetermined temperature at which the cooling exclusive chamber 4 becomes the lower limit value of the cooling temperature range When the cooling is performed, the compressor 5 is stopped in addition to closing the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 and stopping the internal fan 29.

  If the temperature in the cooling chamber 4 rises to a predetermined temperature that is the upper limit value of the cooling temperature range while the compressor 5 is stopped, the flow path to the expansion mechanism 44 is opened and the flow path to the expansion mechanism 45 is opened. The three-way valve 42 is switched to the closed state, the compressor 5 is started, and the internal fan 29 is operated.

  When the compressor 5 is started, the three-way valve 42 opens the flow path to the expansion mechanism 44 and closes the flow path to the expansion mechanism 45 in advance, and the electromagnetic valve 51, the electromagnetic valve 52, and the electromagnetic valve 56 Occlude.

  When the compressor 5 is stopped, the refrigerant outlet on the expansion mechanism 44 side or the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 is opened to balance the high and low pressures of the refrigerant circuit. The refrigerant outlet of the condenser 46 and the suction side (suction side) piping of the compressor 5 are communicated with each other.

  Then, after the high and low pressures of the refrigerant circuit are balanced, the refrigerant outlet on the expansion mechanism 44 side of the three-way valve 42 or the refrigerant outlet on the expansion mechanism 45 side is closed.

  As a result, excess refrigerant can be stored in the internal condenser 46 that is not used in the cooling operation while the compressor 5 is stopped, so that it is possible to prevent an excessive amount of refrigerant during the cooling operation. Further, it is possible to prevent the refrigerant from being stored in the internal condenser 46 due to the leakage of the refrigerant through the three-way valve 57 and falling into a refrigerant shortage state.

  In addition, when the second cooling greenhouse 3 is switched from the heating operation by the heating heater 31 to the cooling operation, or at the initial pull-down at a high outside air temperature, the temperature in the warehouse is high and a large refrigerating capacity is required. In this case, if the solenoid valve 50 is always opened regardless of the operation / stop of the compressor 5 and the refrigerant outlet of the internal condenser 46 and the suction side (suction side) piping of the compressor 5 are communicated, Since all the refrigerants can be used for the cooling operation, a large refrigerating capacity can be obtained and the pull-down time can be shortened.

  Next, in the case of the cooling operation in which the first cooling greenhouse 2 is heated by the heating heater 30 and the cooling exclusive chamber 4 is cooled, the operation in which the refrigerant flows in the direction of the arrow in the thick refrigerant path in FIG. It becomes.

  In the case of the cooling operation in which the first cooling greenhouse 2 is heated by the heating heater 30 and the cooling exclusive chamber 4 is cooled, the three-way valve 57 is connected to the discharge pipe of the compressor 5 and the external condenser 40. In addition, the three-way valve 42 closes the flow path to the expansion mechanism 44 for the internal evaporator 9 and opens the flow path to the expansion mechanism 45 for the internal evaporator 10. Then, the solenoid valve 52 and the solenoid valve 56 are closed, and the compressor 5 is started. Further, the heating heater 30 is energized. In addition, when the heating heater 30 is energized, the internal fan 27 blows air to the internal evaporator 47.

  The control means (not shown) controls energization of the heating heater 30 so that the room temperature of the first cooling greenhouse 2 is maintained within a preset heating temperature range.

  The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 5 passes through the three-way valve 57 and is cooled and condensed by the external condenser 40. In addition, when the refrigerant is flowing through the external condenser 40, the external fan 26 blows air to the external condenser 40. The refrigerant condensed in the outside condenser 40 flows from the three-way valve 42 to the expansion mechanism 45 side, and after being depressurized by the expansion mechanism 45, the refrigerant evaporates and cools in the internal evaporator 10 to cool the cooling dedicated chamber 4. When the refrigerant is flowing through the internal evaporator 10, the internal fan 29 blows air to the internal evaporator 10.

  The refrigerant flowing out of the internal evaporator 10 is separated into a gas refrigerant and a liquid refrigerant by the gas-liquid separator 59, and the gas refrigerant separated from the liquid refrigerant by the gas-liquid separator 59 is sucked into the compressor 5. It is.

  When the exclusive cooling chamber 4 is cooled to a predetermined temperature that is the lower limit value of the cooling temperature range, the compressor 5 is closed in addition to closing the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 and stopping the internal fan 29. Also stop.

  Further, when the temperature in the exclusive cooling chamber 4 rises to a predetermined temperature that is the upper limit value of the cooling temperature range while the compressor 5 is stopped, the three-way valve 42 is switched to a state in which the flow path to the expansion mechanism 45 is opened. Then, the compressor 5 is started and the internal fan 29 is operated.

  When the compressor 5 is started, the solenoid valve 51, the solenoid valve 52, and the solenoid valve 56 are closed in advance.

When the compressor 5 is stopped, in order to balance the high and low pressure of the refrigerant circuit, the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 is opened, and the refrigerant outlet of the internal condenser 46 is compressed. The suction side (suction side) piping of the machine 5 is communicated.

  Then, after the high and low pressures of the refrigerant circuit are balanced, the refrigerant outlet on the expansion mechanism 45 side of the three-way valve 42 is closed.

  As a result, excess refrigerant can be stored in the internal condenser 46 that is not used in the cooling operation while the compressor 5 is stopped, so that it is possible to prevent an excessive amount of refrigerant during the cooling operation. Further, it is possible to prevent the refrigerant from being stored in the internal condenser 46 due to the leakage of the refrigerant through the three-way valve 57 and falling into a refrigerant shortage state.

  When the internal temperature is high and a large refrigeration capacity is required, such as during initial pull-down at a high outside air temperature, the solenoid valve 50 is always opened regardless of whether the compressor 5 is operated or stopped. If the refrigerant outlet of the inner condenser 46 and the suction side (suction side) piping of the compressor 5 are connected, all the refrigerant can be used for the cooling operation, so that a large refrigeration capacity can be obtained and the pull-down time is shortened. It becomes possible.

  As described above, the vending machine of the present embodiment includes the compressor 5, the external condenser 40 that condenses the refrigerant discharged from the compressor 5, and a plurality of product storage rooms (first cooling chambers). 2, the refrigerant | coolant which was installed in the 2nd cooling greenhouse 3 and the cooling exclusive room 4), and was condensed with the condenser 40 outside a store | warehouse | chamber is evaporated, and the goods storage room (the 1st cooling greenhouse 2 and the 2nd cooling greenhouse 3) , The internal evaporators 9, 10, 47 for cooling the product in the cooling chamber 4), the branch points for branching the refrigerant flow path to the multiple internal evaporators 9, 10, 47, and the multiple internal evaporators Branch channel opening / closing means (three-way valve 42 and electromagnetic valve 51) for opening and closing the branch channel between the container and a plurality of product storage chambers (first cooling greenhouse 2, second cooling greenhouse 3, cooling) Product storage chamber (first chamber) for heating products in the product storage chamber (first cooling greenhouse 2) using the heat of condensation of the refrigerant in the dedicated chamber 4) The internal condenser 46 installed in the cooling greenhouse 2) and the refrigerant discharged from the compressor 5 when warming the goods in the product storage room (first cooling greenhouse 2) with the internal condenser 46 Is discharged from the compressor 5 when the product in the product storage chamber (first cooling greenhouse 2) is not heated by the internal condenser 46 after passing through the internal condenser 46 and flowing to the external condenser 40. In-condenser condenser channel switching means (three-way valve 57) for flowing the refrigerant to the outside condenser 40 without passing through the inside condenser 46, and the outside condenser 40 and branch channel opening / closing means (three-way valve 42). And the solenoid valve 51) and the bypass passage provided on the bypass passage bypassing the refrigerant piping and the suction side piping of the compressor 5, and the bypass passage on the inflow side of the outside evaporator 41 Bypass channel opening / closing means (electromagnetic valve 52) for opening and closing, bypass channel opening / closing means (electromagnetic valve 52) and outside of the chamber A bypass channel expansion means (expansion mechanism 53) provided in a bypass channel between the generator 41 and depressurizing the refrigerant condensed in the internal condenser 46 and the external condenser 40 and flowing into the bypass channel; Of the product storage chambers (first cooling chamber 2, second cooling chamber 3, and cooling chamber 4) at least one product storage chamber (cooling chamber 4) in which the internal condenser 46 is not installed. The internal cold-cooled evaporator 54 that evaporates the refrigerant that has been condensed in the external condenser 40 and cools the product in the product storage chamber (cooling exclusive chamber 4) at a higher temperature than the internal evaporator 10; A weakly-branching channel opening / closing means (solenoid valve 56) for opening and closing a branching channel between the branching point for branching the refrigerant channel to the inside-cooling evaporator 54 and the inside-cooling evaporator 54; Vending machine.

  With the above configuration, at the time of low outside air temperature at which the load on the cooling chamber decreases, the product storage room (first cooling greenhouse 2) having the internal condenser 46 is heated by the internal condenser 46. Even in the case where the refrigerant cannot flow through the internal evaporators 9 and 10 in the product storage room (the second cooling greenhouse 3 and the cooling exclusive room 4), either the internal cold evaporator 54 or the external evaporator 41 is used. Alternatively, by using the refrigerant flow path for flowing the refrigerant to both, the operation of the compressor 5 can be continued, the heat pump heating capacity of the internal condenser 46 is increased, and the power consumption is further increased by the efficient heat pump heating operation. Can be reduced.

  In addition, the refrigerant that flows into the internal cold evaporator 54 is connected to the flow path between the weak cold branch passage opening / closing means (electromagnetic valve 56) and the internal cold evaporator 54 by the refrigerant flowing into the internal cold evaporator 54. Since it has a weakly branched flow path expansion means (expansion mechanism 55) for reducing the pressure of the refrigerant so that the temperature does not fall below the temperature at which the cooled product freezes, the internal cold air evaporation is caused by the refrigerant flowing into the internal cold evaporator 54. Since the temperature of the vessel 54 does not become lower than the temperature at which the cooled product is frozen, the cooled product in the product storage room (cooling dedicated chamber 4) in which the cool evaporator 54 is installed is cooled by the internal evaporator 10. When there is not, the refrigerant can be flowed through the internal cold evaporator 54 and heated by the internal condenser 46.

  In the vending machine of the present embodiment, when the first cooling greenhouse 2 is heated by the internal condenser 46, the electromagnetic valve 52 and the electromagnetic valve 56 are opened and closed, and the three-way valve 42 is internal. By controlling the opening and closing of the flow path (exit) to the expansion mechanism 44 for the evaporator 9 and the flow path (exit) to the expansion mechanism 45 for the internal evaporator 10, the internal evaporators 9, 10 and the outside of the storage By evaporating the refrigerant in either the evaporator 41 or the interior cold evaporator 54, the heat sources necessary for heating the first cooling greenhouse 2 are the interior evaporators 9 and 10 and the exterior evaporation. The compressor 41 and the low-temperature evaporator 54 can be selected, so that the operation of the compressor 5 is continued regardless of the load state of the second cooling greenhouse 3 and the cooling exclusive chamber 4 to perform the first cooling. It becomes possible to heat the heating chamber 2, and the heat pump heating operation is performed even at a low outside temperature where the load on the cooling chamber decreases. It can be reduced power consumption by the.

  Further, an expansion mechanism 48 is provided on the pipe between the refrigerant outlet side of the internal condenser 46 and the external condenser 40 (between the refrigerant outlet side of the internal condenser 46 and the check valve 58). This makes it possible to make a difference between the internal condensation temperature and the external condensation temperature. Even when the condensation temperature or the condensation pressure of the external condenser 40 decreases in the low outside air, the internal condenser 46 has a high condensation temperature. Since the first cooling greenhouse 2 can be efficiently heated, a highly efficient heating operation can be performed even in an area where the outdoor temperature is low in winter.

  Further, an expansion mechanism 48 is provided on a pipe between the refrigerant outlet side of the internal condenser 46 and the external condenser 40 (between the refrigerant outlet side of the internal condenser 46 and the check valve 58). Since the refrigerant density is reduced, the amount of refrigerant can be reduced. By reducing the amount of refrigerant, it is possible to reduce the optimum refrigerant amount difference between the cooling and heating operation using two condensers and the cooling operation using one condenser, and when using a flammable refrigerant Can be used to reduce the risk of leakage.

  By using a capillary tube for the expansion mechanism 48, it is possible to combine the role as the expansion mechanism and the role of piping connecting the internal condenser 46 and the check valve 58. Therefore, when an expansion valve or the like is used As a result, the amount of refrigerant can be further reduced. In addition, capillary tubes can be used for the expansion mechanisms 43, 44, 45, 53, and 55.

  Further, by switching the operation mode by selecting the internal evaporators 9 and 10, the external evaporator 41, and the internal cold evaporator 54 on the downstream side of the external condenser 40, the cooling and heating operation and the heating are performed. In either temperature operation, the refrigerant condensed by the internal condenser 46 is condensed again by the external condenser 40, and the condenser piping volume becomes the same in the cooling and heating operation and the optimal refrigerant. It becomes possible to make the quantity the same.

In the case of a heating operation in which the refrigerant flows into the outside evaporator 41, the refrigerant evaporates and cools the ambient air in the outside evaporator 41 installed in the machine room below the product storage, In a state where the humidity of the ambient air is high, the piping in the outside evaporator 41 may condense or frost, and the condensed water may drip from the machine room to the outside of the vending machine. The external condenser 40 and the external evaporator 41 are integrated heat exchangers that share fins, and the external condenser 40 and the external evaporator are provided with a piping configuration that always dissipates heat and condenses in the external condenser 40. Heat can be exchanged between the condenser 41 and the amount of heat that cools the ambient air by the outside evaporator 41 can be reduced. The condensation water can be evaporated by warming the fins. It is possible to prevent the dropping of the vending machine outside-compartment of condensation water because it is.

  At this time, the heat exchange between the external condenser 40 and the external evaporator 41 is further enhanced by arranging the piping of the external condenser 40 so that it is located on the windward side when the external fan 26 is operated. It is possible to suppress condensation.

  Furthermore, since the distance at which the condensed water drops through the fins by placing the inlet where the temperature decreases most in the external evaporator 41 at the upper part of the integrated heat exchanger, it is easy to evaporate during the dropping, It becomes more difficult to dripping. Furthermore, it is possible to further prevent dripping outside the vending machine by arranging a tray that receives the condensed water dripped at the bottom of the integrated heat exchanger.

  In the cooling operation in which the refrigerant does not pass through the internal condenser 46, the refrigerant leaks from the discharge pipe side of the compressor 5, which has a high pressure in the three-way valve 57, to the internal condenser 46 side, which is the low pressure side. However, the refrigerant and refrigerating machine oil continue to stay in the internal condenser 46 and cause a cooling capacity deficiency and a failure of the compressor 5. However, on the pipe connecting the internal condenser 46 and the low-pressure side pipe, An electromagnetic valve 50 is provided, and by opening the electromagnetic valve 50, the refrigerant and oil accumulated in the internal condenser 46 can be recovered to the suction pipe of the compressor 5 at a low pressure, and the cooling capacity is insufficient. A failure of the compressor 5 can be prevented.

  Further, by opening the electromagnetic valve 50, the pressure in the piping of the internal condenser 46 becomes the same as the suction pressure of the compressor 5. As a result, a high / low pressure difference in the three-way valve 57 can be secured, and leakage of the refrigerant in the three-way valve 57 can be prevented.

  Note that the amount of refrigerant leakage in the three-way valve 57 is very small in normal times, so that the same effect can be obtained even if the solenoid valve 50 is not always opened, but is regularly opened for a predetermined time during the start-up of the compressor 5. Can be obtained. As a result, the electric energy of the electromagnetic valve 50 can be suppressed to the minimum.

  Furthermore, if there is an abnormality in the three-way valve 57 and the amount of leakage of the three-way valve 57 is larger than usual, and there is a control to change the opening time of the solenoid valve 50, it is possible to cope with an abnormality when the leakage amount increases. It becomes possible to do.

  The accumulated refrigerant was recovered by connecting the internal condenser 46 and the suction pipe of the compressor 5. However, the pipe to be connected may be anywhere as long as it is the same as the suction pressure of the compressor 5. However, it may be downstream of the expansion mechanisms 43, 44, 45, 53, 55.

  However, if the connection is made in the product storage, the solenoid valve 50 is provided in the product storage, and space is required, so the product storage space may be reduced, and the product storage is cooled. In this case, since the solenoid valve 50 is energized to generate a heat load, the refrigerant can be most efficiently recovered by connecting it to the vicinity of the suction pipe of the compressor 5.

  When the piping of the external condenser 40 is arranged in the lower part of the integrated heat exchanger and the piping of the external evaporator 41 is arranged in the upper part of the integrated heat exchanger, it is generated in the upper external evaporator 41. By evaporating the condensed water dripping along the fin in the vicinity of the lower external condenser 40, it is possible to prevent the condensed water from dripping.

  As for the compressor 5, the cooling load of the first cooling greenhouse 2, the second cooling greenhouse 3, the cooling exclusive chamber 4 or the heating load of the first cooling greenhouse 2 is large and is cooled to a predetermined temperature range. A variable capacity compressor can be used to increase the capacity when it takes time to heat.

  Similarly, as the outside fan 26 and the inside fans 27, 28, and 29, fans that can increase or decrease the amount of air flow as needed can be used.

  The operation and stop timings of the external fan 26 and the internal fans 27, 28, and 29 are the timing of the operation of the compressor 5 and the change in the state of the refrigerant flow in the corresponding heat exchanger, if necessary. When the combustible refrigerant is used, the outside fan 26 may be operated with a predetermined capacity when the compressor 5 is stopped.

  As described above, the present invention performs efficient heat pump heating regardless of the operation state of the other product storage chambers when the product storage chamber is heated in the product storage chamber having the internal condenser. Therefore, the present invention can be applied not only to vending machines but also to devices in which a compressor uses a single refrigerant circuit (heat pump) to cool and heat a plurality of chambers.

1 Product Storage 2 First Cooling Greenhouse (Product Storage Room)
3 Second cooling chamber (product storage room)
4 Cooling room (product storage room)
5 compressor 9 internal evaporator 10 internal evaporator 26 external fan 27 internal fan 28 internal fan 29 internal fan 30 warming heater 31 warming heater 40 external condenser 41 external evaporator 42 three-way valve 42 three-way valve (Branch channel opening / closing means)
43 Expansion Mechanism 44 Expansion Mechanism 45 Expansion Mechanism 46 Internal Condenser 47 Internal Evaporator 48 Expansion Mechanism 49 Four-way Switching Valve (Internal Condenser Channel Switching Unit)
50 Solenoid valve 51 Solenoid valve (branch flow path opening / closing means)
52 Solenoid valve (Bypass channel opening / closing means)
53 Expansion mechanism (Bypass channel expansion means)
54 Weak cold evaporator 55 Expansion mechanism (weak cooling branch flow path expansion means)
56 Solenoid valve (lightly cooling branch channel opening / closing means)
57 Three-way valve (flow path switching means for condenser in cabinet)
58 Check valve 59 Gas-liquid separator

Claims (2)

A compressor, an outside-condenser that condenses the refrigerant discharged from the compressor, and a refrigerant that is installed in a plurality of product storage rooms and that is condensed by the outside-condenser cools the product in the product storage room Intra-compartment evaporator, branch passage opening / closing means for opening / closing branch passages between the plurality of in-compartment evaporators and a branch point for branching the refrigerant passage to the plurality of in-compartment evaporators, and a plurality of commodities A condensing unit installed in the product storage room that heats the product in the product storage room using the condensation heat of the refrigerant in the storage room, and a product in the product storage room is heated by the internal condenser. Sometimes the refrigerant discharged from the compressor passes through the internal condenser and then flows to the external condenser, and is discharged from the compressor when the internal condenser does not heat the product in the product storage chamber. The inside condensate that flows the cooled refrigerant to the outside condenser without passing through the inside condenser An external evaporator provided in a bypass flow path for bypassing the flow path switching means, the refrigerant pipe between the external condenser and the branch flow path opening / closing means and the suction side pipe of the compressor; A bypass flow path opening / closing means for opening and closing the bypass flow path on the inflow side of the external evaporator, and the internal condensation provided in the bypass flow path between the bypass flow path opening / closing means and the external evaporator A bypass passage expansion means for decompressing the refrigerant condensed in the container and the external condenser and flowing into the bypass passage, and at least one product in which the internal condenser is not installed among a plurality of product storage chambers An internal cold storage evaporator that evaporates the refrigerant that is installed in the storage chamber and condenses in the external condenser to cool the product in the product storage room at a temperature higher than the internal evaporator, and the internal cold storage evaporation Branch point for branching the refrigerant flow path to the vessel and the inside of the chamber Weak cooling channel open / close means for opening and closing the branch channel between the cold evaporator, and the internal cold cooling in the channel between the weak cooling channel opening / closing means and the internal cold evaporator A vending machine having weak cold branch passage expansion means for depressurizing the refrigerant so that the temperature of the cold-cooled evaporator in the warehouse does not fall below the temperature at which the cooled product freezes due to the refrigerant flowing into the evaporator. The vending machine according to claim 1, wherein the weakly-cooled branch channel expansion means is a capillary tube.

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