JP2013084073A - Automatic vending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic vending machine capable of performing efficient cooling and warming using a refrigerant circuit (heat pump).SOLUTION: When an inside condenser 46 warms articles in a first cooling/warming chamber 2, and a four-way valve 49 is switched to make a refrigerant discharged from a compressor 5 flow to an outside condenser 40 through the inside condenser 46. When a second cooling/warming chamber 3 and a cooling chamber 4 are not both cooled, a solenoid valve 52 is opened to make the refrigerant flowing out of the outside condenser 40 flow to a bypass flow passage, and the refrigerant is decompressed by an expanding mechanism 53 in the bypass flow passage, vaporized by an outside evaporator 41, and returned to the compressor 5. The outside condenser 40 and outside condenser 41 share an end plate and have a fin individually.

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).

  Hereinafter, a conventional vending machine disclosed in Patent Document 1 will be described with reference to the drawings.

  FIG. 5 shows a refrigerant circuit diagram in the conventional vending machine disclosed in Patent Document 1, and FIG. 6 shows a control flowchart when the operation mode of the vending machine is switched.

  The conventional vending machine disclosed in Patent Document 1 has 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.

  And the compressor 5, the external heat exchanger 6, the expansion valve 7 which decompresses the refrigerant | coolant to pass, the internal heat exchanger 8a arrange | positioned in the 1st cooling greenhouse 2, and the inside of the 2nd cooling greenhouse 3 The internal heat exchanger 8b disposed in the cooling chamber, the internal evaporator 10 disposed in the cooling exclusive chamber 4, the electromagnetic valves 11 to 19 for opening and closing, and the check valve 20 for allowing the refrigerant to pass only in the direction of the arrow. 25 constitutes a refrigerant circuit.

  An external fan 26 is installed in the vicinity of the external heat exchanger 6, and internal fans 27 to 29 are installed in the vicinity of the heat exchanger in each product storage, and the first cooling greenhouse 2 and the first Heating heaters 30 and 31 are respectively installed in the second cooling and heating greenhouse 3.

  The operation of the conventional vending machine installed as described above will be described below with reference to FIG. A case will be described in which only the first cooling greenhouse 2 is heated and the other rooms are cooled.

  The conventional vending machine heats the first cooling greenhouse 2 and simultaneously cools the second cooling greenhouse 3 and the cooling exclusive chamber 4 (three-room operation CCH, two-chamber operation CH). And a heating operation mode (one-chamber operation H) in which only the first cooling greenhouse 2 is heated, and a cooling operation mode (two-chamber operation) in which only the second cooling / heating chamber 3 and the cooling exclusive chamber 4 are cooled. CC, one-chamber operation C) is performed by switching the solenoid valves 11-19.

  Here, in FIG. 6, a priority room is provided in each product storage, and control is performed to switch the operation mode according to the heating ON / OFF temperature and the temperature state of the priority room / non-priority room. By doing so, it is possible to always perform the operation in the optimum operation mode regardless of the cooling load and the heating load, which can lead to energy saving.

Further, as a vending machine using another cooling and heating system, a vending machine including a heat exchanger in which an external condenser and an external evaporator are integrated has been proposed (for example, see Patent Document 2).

  According to this, it is composed of two units: a cooling system for cooling a product storage for storing products, and a cooling and heating system for cooling or heating the product storage for storing products. Two compressors for the heating switching chamber are used, and the heat exchanger provided in the machine room is an integration of the condenser of the cooling system and the external heat exchanger of the cooling heating system.

  The piping of the cooling system and the cooling and heating system are independent, but the heat exchanger fins exchange heat with the heat exchanger fins to increase the evaporation temperature during heating. Thus, the condensation temperature during heating can be increased, and the heating efficiency is improved.

JP 2006-011604 A JP 2006-119808 A

  However, in the conventional configuration disclosed in Patent Document 1, both the internal heat exchanger and the external heat exchanger have a specification in which one heat exchanger is used by exchanging roles with a condenser or an evaporator. Therefore, it is necessary to branch the heat exchanger outlet into a pipe connected to the expansion valve and a pipe connected to the compressor suction pipe, and an electromagnetic valve that opens and closes the pipe connected to the compressor suction pipe. Must be provided.

  When each heat exchanger acts as an evaporator, the solenoid valve is opened, but the inside of the solenoid valve is usually narrower than the surrounding piping, causing a pressure loss when the refrigerant passes. , Causing a reduction in compressor efficiency. In addition, if the inside of the solenoid valve is widened, it is necessary to strengthen the force of the coil when opening and closing, and accordingly, there is a problem that the power consumption during energization of the coil increases.

  In addition, the optimal specifications differ between the condenser and the evaporator, and if the condenser is the optimal specification, there is a concern about the return of refrigerant liquid due to insufficient capacity as a heat exchanger when used as an evaporator. When the optimum specification is used, there is a problem that when the condenser is used as a condenser, the condensation temperature cannot reach the target temperature and the heating capacity is lowered, so that the operation with the optimum specification corresponding to each operation cannot be performed. .

  Moreover, in the cooling and heating system provided with the heat exchanger which integrated the outside condenser and the outside evaporator disclosed by patent document 2, if it evaporates with an outside evaporator, the heat dissipation capability of an outside condenser will be shown. However, in the case of cooling, there is a problem that the evaporation temperature is lowered and the cooling capacity is lowered.

  This invention solves the said conventional subject, and it aims at providing the vending machine which can perform efficient cooling and heating using a refrigerant circuit (heat pump).

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. An internal evaporator that evaporates the refrigerant condensed in the product and cools the product in the product storage room, a branch point that branches the refrigerant flow path to the plurality of internal evaporators, or the branch point and the plurality of internal evaporators And a branch channel opening / closing means provided in the branch channel between the two and the product storage chamber for heating the product in the product storage chamber using the condensation heat of the refrigerant among the plurality of product storage chambers. And the refrigerant discharged from the compressor when the product in the product storage room is warmed by the internal condenser is passed through the internal condenser and then flowed to the external condenser. The product is discharged from the compressor when the product in the product storage room is not heated by the internal condenser. The internal condenser flow path switching means for flowing the refrigerant to the external condenser without passing through the internal condenser, the refrigerant pipe between the external condenser and the branch flow path opening / closing means, and the compression An external evaporator provided in a bypass flow path that bypasses the suction side piping of the machine, bypass flow opening and closing means for opening and closing the bypass flow path on the inflow side of the external evaporator, and opening and closing the bypass flow path A bypass passage expansion means provided in the bypass passage between the means and the outside evaporator and depressurizing the refrigerant condensed by the inside condenser and the outside condenser and flowing into the bypass passage. Have.

  The outside condenser and the outside evaporator are each a heat exchanger in which piping passes through a plurality of fins arranged parallel to each other at intervals, and end plates arranged on both sides of the fins. The end plate for the external condenser and the end plate for the external evaporator are connected, but the fins through which the pipe for the external condenser passes and the external evaporator It is not connected to the fin through which the pipe penetrates.

  This eliminates the need for an electromagnetic valve for switching the heat exchanger between the condenser and the evaporator, and can suppress loss and increase in power consumption due to the switching electromagnetic valve. Further, since the heat exchanger can be constituted by a heat exchanger designed exclusively for each without using both the condenser and the evaporator, the efficiency can be improved.

  In addition, in the product storage room having the internal condenser, the product is heated by the internal condenser, but even when the refrigerant cannot flow to the internal evaporator in another product storage room, the refrigerant is allowed to flow to the external evaporator. The operation of the compressor can be continued, and efficient heat pump heating can be performed.

  In addition, since the fin through which the pipe for the outside condenser passes and the fin through which the pipe for the outside evaporator penetrates are not connected, even if the refrigerant flows into the outside evaporator and the refrigerant evaporates in the outside evaporator The outside condenser is not affected, the inside condensation temperature does not change, and the heating capacity and heating efficiency can be maintained.

  The vending machine of the present invention does not require an electromagnetic valve for switching the heat exchanger between the condenser and the evaporator, and can suppress loss and increase in power consumption due to the switching electromagnetic valve. Further, since the heat exchanger can be constituted by a heat exchanger designed exclusively for each without using both the condenser and the evaporator, the efficiency can be improved.

  In addition, in the product storage room having the internal condenser, the product is heated by the internal condenser, but even when the refrigerant cannot flow to the internal evaporator in another product storage room, the refrigerant is allowed to flow to the external evaporator. The operation of the compressor can be continued, and efficient heat pump heating can be performed.

  In addition, since the fin through which the pipe for the outside condenser passes and the fin through which the pipe for the outside evaporator penetrates are not connected, even if the refrigerant flows into the outside evaporator and the refrigerant evaporates in the outside evaporator The outside condenser is not affected, the inside condensation temperature does not change, and the heating capacity and heating efficiency can be maintained.

Refrigerant circuit diagram of vending machine in Embodiment 1 of the present invention Refrigerant circuit diagram during cooling operation of vending machine according to Embodiment 1 of the present invention Refrigerant circuit diagram at the time of cooling and heating operation of the vending machine in Embodiment 1 of the present invention Refrigerant circuit diagram during heating operation of vending machine in Embodiment 1 of the present invention Refrigerant circuit diagram of a conventional vending machine Flowchart of conventional vending machine operation switching control

  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 Provided in an internal evaporator for cooling indoor commodities, a branch point for branching a refrigerant flow path to the plurality of internal evaporators, or a branch flow path between the branch points and the plurality of internal evaporators Branch channel opening / closing means, a condensing unit 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 room is warmed by the condenser, the refrigerant discharged from the compressor passes through the internal condenser and then flows to the external condenser, and the product in the product storage room by the internal condenser. When the refrigerant is not heated, the refrigerant discharged from the compressor does not pass through the internal condenser Bypass flow path for bypassing the internal condenser flow path switching means for flowing to the external condenser, the refrigerant pipe between the external condenser and the branch flow path opening / closing means, and the suction side pipe of the compressor An external evaporator provided in the internal combustion chamber, bypass flow opening / closing means for opening and closing the bypass flow path on the inflow side of the external evaporator, and between the bypass flow opening / closing means and the external evaporator A bypass channel expansion means provided in the bypass channel and depressurizing the refrigerant that has been condensed by the internal condenser and the external condenser and flowed into the bypass flow path, and the external condenser and the external compartment Each of the evaporators is a heat exchanger in which piping passes through a plurality of fins arranged parallel to each other at intervals, and end plates arranged on both sides of the fins, and the end for the external condenser Front for plate and said external evaporator The vending machine is connected to an end plate, but is not connected to the fin through which the pipe for the external condenser penetrates and the fin through which the pipe for the external evaporator penetrates. is there.

  This eliminates the need for an electromagnetic valve for switching the heat exchanger between the condenser and the evaporator, and can suppress loss and increase in power consumption due to the switching electromagnetic valve. Further, since the heat exchanger can be constituted by a heat exchanger designed exclusively for each without using both the condenser and the evaporator, the efficiency can be improved.

  In addition, in the product storage room having the internal condenser, the product is heated by the internal condenser, but even when the refrigerant cannot flow to the internal evaporator in another product storage room, the refrigerant is allowed to flow to the external evaporator. The operation of the compressor can be continued, and efficient heat pump heating can be performed.

  In addition, since the fin through which the pipe for the outside condenser passes and the fin through which the pipe for the outside evaporator penetrates are not connected, even if the refrigerant flows into the outside evaporator and the refrigerant evaporates in the outside evaporator The outside condenser is not affected, the inside condensation temperature does not change, and the heating capacity and heating efficiency can be maintained.

  According to a second aspect of the invention, in particular, in the first aspect of the invention, the pipe for the outside condenser is arranged on the windward side, and the pipe for the outside evaporator is on the leeward side. Since the piping for the container is located on the windward side and the piping for the outside evaporator is on the leeward side, the outside evaporator is designed to improve efficiency by increasing the evaporation temperature due to the exhaust heat from the outside condenser, The effect of preventing condensation can be obtained.

  In a third aspect of the invention, particularly in the first or second aspect of the invention, the bypass flow path opening / closing means is configured such that the refrigerant discharged from the compressor flows to the external condenser via the internal condenser. Only when the evaporation temperature is increased, the condensation temperature of the internal condenser can be increased and the heating capacity can be increased.

According to a fourth aspect of the present invention, in particular, in any one of the first to third aspects, the piping for the external condenser and the piping for the external evaporator are respectively arranged in such a manner that the refrigerant flows from above to below in the piping. The external evaporator is more easily subjected to the exhaust heat of the external condenser, and can improve efficiency by increasing the evaporation temperature and can also prevent the condensation of the fins.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a refrigerant circuit diagram of a vending machine according to the first embodiment of the present invention, FIG. 2 is a refrigerant circuit diagram during cooling operation of the vending machine of the same embodiment, and FIG. 3 is a vending machine of the same embodiment. FIG. 4 is a refrigerant circuit diagram during the heating operation of the vending machine according to the embodiment.

  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 on the windward side, and the outside evaporator 41 is An outside fan 26 that is located in the vicinity of the outside condenser 40 and the outside evaporator 41 so as to be on the leeward side and blows air so that heat exchange between the outside condenser 40 or the outside evaporator 41 is promoted. Be placed.

  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. .

  The external evaporator 41 is a refrigerant pipe (storage) between the refrigerant outlet of the external condenser 40 and a branch point that branches the refrigerant flow path to the internal evaporator 47 side and the internal evaporators 9 and 10 side. It is provided in a bypass channel that bypasses the refrigerant outlet side refrigerant pipe of the outer condenser 40 and the suction side pipe of the compressor 5.

  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, in the present embodiment, the refrigerant outlet of the internal evaporator 9 and the refrigerant inlet of the internal evaporator 10 are connected, and the internal evaporator 9 and the internal evaporator 10 are connected to one large evaporator. As a result, it is possible to increase the evaporation temperature, increase the efficiency, and reduce the power consumption.

  The operation of the vending machine configured as above according to Embodiment 1 of the present invention will be described below.

  First, in the case of the 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 in 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.

  Then, the control means (not shown) of the cooling and heating system is configured so that the temperature in each of the first cooling and heating greenhouse 2, the second cooling and heating chamber 3, and the cooling exclusive chamber 4 is within a preset cooling temperature range. Thus, 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, and 29 are controlled.

  For example, 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 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 outlets of both refrigerants of the three-way valve 42 are closed 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 compressed. When 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 electromagnetic 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.

  When the compressor 5 is stopped, the refrigerant valve 51 and 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 are opened to balance the high and low pressures of the refrigerant circuit. When doing so, the solenoid valve 50 is opened, and the refrigerant outlet of the internal condenser 46 and the suction side (suction side) piping of the compressor 5 are communicated.

  Then, after the high and low pressures of the refrigerant circuit are balanced, the solenoid valve 50 is also closed when the solenoid valve 51 and the refrigerant outlet of the three-way valve 42 are 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, every time the compressor 5 is stopped, the solenoid valve 50 is opened, and the refrigerant leaks at the four-way switching valve 49, 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 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 thick refrigerant path in FIG. The refrigerant flows in the operation.

  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 four-way switching valve 49 is connected to the discharge pipe of the compressor 5 and the inside of the refrigerator. The refrigerant inlet of the condenser 46 communicates with the refrigerant outlet of the internal condenser 46 and the external condenser 40 communicates, and the three-way valve 42 opens the flow path to the expansion mechanism 44. Then, the flow path to the expansion mechanism 45 is closed, the electromagnetic valve 51 and the electromagnetic valve 52 are 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 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.

  All the refrigerant that has flowed out of the outside condenser 40 flows toward the three-way valve 42 because the electromagnetic valve 51 is 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.

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

  And the control means (not shown) of the cooling and heating system maintains the indoor temperature of the first cooling and heating chamber 2 within the preset heating temperature range, and the second cooling and heating chamber 3, dedicated for cooling. The four-way switching valve 49 and the three-way valve 42 are switched, and the compressor 5, the outside fan 26, and the inside fans 27, 28, so as to maintain the temperature in each room of the room 4 within a preset cooling temperature range. 29 operations are controlled.

  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. 4), the discharge pipe of the compressor 5 and the external condenser 40 are connected to each other, and the internal condenser is connected to the four-way switching valve 49. The refrigerant inlet 46 and the refrigerant outlet of the internal condenser 46 communicate with each other to form a closed loop, and the internal fan 27 is stopped.

  After switching the four-way switching valve 49 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 lowered to a predetermined temperature that is the lower limit value of the heating temperature range. For example, again, the four-way switching valve 49 communicates between 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 communicates with the external condenser 40. While returning to the state, 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 three-way valve 42 is switched to a state in which the flow path to the expansion mechanism 45 is closed, 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 outlet of the refrigerant on the expansion mechanism 45 side 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 expansion mechanism 45 of the three-way valve 42. In addition to closing the outlet of the refrigerant on the side and stopping the internal fan 29, the solenoid valve 52 of the bypass flow path is opened to the state shown in FIG. Continue to warm greenhouse 2.

  When the solenoid valve 52 is opened during 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 solenoid valve 52 is closed. As a result, the heating capacity of the internal condenser 46 can be increased.

  When the electromagnetic valve 52 is opened, the refrigerant flows through the bypass flow path, so that the flow path resistance of the refrigerant decreases, the evaporation temperature of the internal evaporators 9 and 10 increases, and the condensing temperature of the internal 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. .

  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 through the thick refrigerant passage in the direction of the arrow 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 outside condenser 40 are in communication with each other, both the flow paths of the three-way valve 42 are closed, the electromagnetic valve 51 is closed, the electromagnetic valve 52 is opened, and the compressor 5 is started and 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 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 that has exited 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 47, 9 and 10 because all the flow paths of the electromagnetic valve 51 and the three-way valve 42 are closed, and all flows to the bypass flow path side. Flowing.

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.

  When the first cooling greenhouse 2 is heated to a predetermined temperature that is the upper limit value of the heating temperature range, the control means (not shown) of the cooling and heating system causes the compressor 5 and the outside fan 26 to be heated. And the internal fan 27 is stopped, and when the compressor 5, the external fan 26, and the internal 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. The control means (not shown) of the cooling and heating system 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, regardless of the load state of the second cooling greenhouse 3 and the cooling chamber 4. By continuing the operation, the first cooling greenhouse 2 can be heated, and the power consumption can be reduced by performing the heat pump heating operation even at a low outside temperature where the load on the cooling chamber is reduced. Can do.

  Further, by providing an expansion mechanism 48 on the pipe between the internal condenser 46 and the external condenser 40, the internal condensation temperature and the external condensation temperature can be differentiated, and the outside of the storage is kept at low outside air. Even when the condensing temperature and the condensing pressure of the condenser 40 are lowered, the internal condenser 46 can maintain a high condensing temperature and can efficiently heat the first cooling greenhouse 2. Highly efficient heating operation can be carried out even in areas where the outside air temperature is low.

  Further, if the expansion mechanism 48 is provided on the pipe between the internal condenser 46 and the external condenser 40, the refrigerant density is reduced, so that 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.

  As the expansion mechanism 48, a capillary tube may be used. By using a capillary tube, the expansion mechanism 48 can be used as a pipe connecting the internal condenser 46 and the four-way switching valve 49. It becomes possible to reduce the amount of refrigerant.

  For the expansion mechanisms 43, 44, 45, and 53, capillary tubes can be used.

  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.

  The outside condenser 40 and the outside evaporator 41 are two-pass heat exchangers in which fins are divided and end plates are integrated, and the outside condenser 40 is located at a position corresponding to the windward side when the outside fan 26 is operated. The piping of the outside evaporator 41 is provided on the leeward side. Therefore, even when the refrigerant flows through the external evaporator 41 in the heating operation, the external condenser 40 is on the windward side and the fins are not connected, so that the temperature decreases due to the external evaporator 41 and the condensation capacity is reduced. Will not be high.

  Thereby, the heating capability fall at the time of heat pump heating can be prevented, without also reducing the condensation temperature of the condenser 46 in a store | warehouse | chamber. Further, the outside of the end plate of the outside heat exchanger is not easily affected by the outside fan 26, but the end plates of the outside condenser 40 and the outside evaporator 41 are integrated, so the temperature from the pipe Therefore, the condensation of the end plate of the external evaporator 41 can be prevented.

  Further, since the outside condenser 40 and the outside evaporator 41 are piped so that the refrigerant flows from the top to the bottom, the temperature at the refrigerant inlet side of the outside evaporator 41 may decrease and frost formation may occur. However, the outdoor evaporator 41 on the leeward side of the outdoor fan 26 is easy to exchange heat, minimizes frost formation, and has an inlet at the upper part of the fin. Can also be suppressed. In addition, when the fins get wet with frost, foreign matter such as cotton dust and dust is likely to be attached. However, since the external condenser 40 is provided on the windward side and the external evaporator 41 is provided behind the fin, it is affected. There is also an effect to make it difficult.

  In addition, about the compressor 5, the cooling load of the 1st cooling greenhouse 2, the 2nd cooling greenhouse 3 and the cooling exclusive chamber 4 or the heating load of the 1st cooling greenhouse 2 is large, and it is in a predetermined temperature range. If it takes time to cool or warm, a variable capacity compressor that increases the capacity may be used.

  Similarly, as the outside fan 26 and the inside fans 27, 28, and 29, a fan that can increase or decrease the air blowing amount as needed may 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 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 chambers (first cooling chambers). The refrigerant stored in the greenhouse 2, the second cooling greenhouse 3, and the cooling exclusive room 4) is evaporated by evaporating the refrigerant condensed by the external condenser 40 (the first cooling greenhouse 2, the second cooling greenhouse). 3. The internal evaporators 47, 9, 10 for cooling the product in the cooling exclusive chamber 4), and the branch points or branch points for branching the refrigerant flow paths to the multiple internal evaporators 47, 9, 10 and a plurality of Branch channel opening / closing means (three-way valve 42, electromagnetic valve 51) provided in the branch channel between the internal evaporators 47, 9, 10 and a plurality of product storage chambers (first cooling greenhouse 2, Product storage room (second cooling room 3 and cooling room 4) that uses the heat of condensation of the refrigerant to heat the product in the product storage room ( When the product in the product storage room (first cooling greenhouse 2) is heated by the in-compartment condenser 46 installed in the cooling room 2) and the in-condenser 46, the product is discharged from the compressor 5. The refrigerant passes through the internal condenser 46 and then flows to the external condenser 40, and the internal condenser 46 does not heat the commodity in the commodity storage room (first cooling greenhouse 2) from the compressor 5. In-condenser condenser flow path switching means (four-way switching valve 49) for flowing the discharged refrigerant to the external condenser 40 without passing through the internal condenser 46, and the external condenser 40 and the branch flow path opening / closing means ( The external evaporator 41 provided in the bypass flow path that bypasses the refrigerant pipe between the three-way valve 42 and the electromagnetic valve 51) and the suction side pipe of the compressor 5, and the bypass on the inflow side of the external evaporator 41 Bypass channel opening / closing means (electromagnetic valve 52) for opening and closing the channel and bypass channel opening / closing means (electromagnetic valve 52) Bypass passage expansion means (expansion mechanism 53) that is provided in a bypass passage between the external evaporator 41 and the external condenser 41 and depressurizes the refrigerant that has been condensed by the internal condenser 46 and the external condenser 40 and that has flowed into the bypass passage. And have.

  And the external condenser 40 and the external evaporator 41 are each heat exchange which piping penetrates the several fin arranged in parallel mutually spaced apart, and the end plate arrange | positioned at the both sides of a fin. The end plate for the outside condenser 40 and the end plate for the outside evaporator 41 are connected to each other. However, the fin through which the pipe for the outside condenser 40 passes and the outside plate for the outside evaporator 41 are connected. It is not connected to the fin that the pipe penetrates.

This eliminates the need for an electromagnetic valve for switching each heat exchanger between the condenser and the evaporator, and can suppress a loss and an increase in power consumption due to the switching electromagnetic valve. Moreover, since each heat exchanger can be comprised by the heat exchanger designed exclusively for each, without using both a condenser and an evaporator, efficiency improvement can be aimed at. In addition, the product storage room (first cooling greenhouse 2) having the internal condenser 46 is heated by the internal condenser 46, but the other product storage rooms (second cooling warming room 3, cooling dedicated room). Even when the refrigerant cannot flow through the internal evaporators 9 and 10 of 4), the operation of the compressor 5 can be continued by flowing the refrigerant through the external evaporator 41, and efficient heat pump heating can be performed.

  In addition, since the fin through which the pipe for the outside condenser 40 passes and the fin through which the pipe for the outside evaporator 41 penetrates are not connected, the refrigerant flows into the outside evaporator 41 so that the outside evaporator 41 Even if the refrigerant evaporates, the outside condenser 40 is not affected, the inside condensation temperature does not change, and the heating capability and the heating efficiency can be maintained.

  Further, the piping for the outside condenser 40 is arranged on the leeward side and the piping for the outside evaporator 41 is on the leeward side (the outside condenser 40 is on the leeward side and the outside evaporator 41 is on the leeward side). The external fan 26 located near the external condenser 40 and the external evaporator 41 is disposed so that the external evaporator 41 is evaporated under the influence of the exhaust heat of the external condenser 40. Efficiency improvement due to temperature rise and the effect of preventing condensation on the fins can also be obtained.

  The bypass flow path opening / closing means (solenoid valve 52) is opened only when the refrigerant discharged from the compressor 5 flows to the external condenser 40 via the internal condenser 46, and evaporates. As the temperature rises, the condensation temperature of the internal condenser 46 can be raised to increase the heating capability.

  Further, the piping for the outside condenser 40 and the piping for the outside evaporator 41 are configured such that the refrigerant flows in the piping from the top to the bottom, respectively. Is more susceptible to the exhaust heat of the external condenser 40, and can also improve efficiency by raising the evaporation temperature, and can also prevent the condensation of the fins.

  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.

2 First cooling chamber (product storage room)
3 Second cooling chamber (product storage room)
4 Cooling room (product storage room)
5 compressor 9 internal evaporator 10 internal evaporator 40 external condenser 41 external evaporator 42 three-way valve (branch flow path opening / closing means)
46 Internal condenser 47 Internal evaporator 49 Four-way selector valve (Channel switching means for internal condenser)
51 Solenoid valve (branch channel opening / closing means)
52 Solenoid valve (Bypass channel opening / closing means)
53 Expansion mechanism (Bypass channel expansion means)

Claims (4)

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 and branch passage opening / closing means provided at a branch point for branching a refrigerant passage to the plurality of in-compartment evaporators or a branch passage between the branch point and the plurality of in-compartment evaporators And an in-compartment condenser installed in the product storage room for heating the product in the product storage room using the heat of condensation of the refrigerant among the plurality of product storage 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 when the internal product is not heated by the internal condenser, The refrigerant discharged from the compressor is condensed outside the warehouse without passing through the inside condenser. A storage provided in a 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 piping of the compressor An outer evaporator, a bypass passage opening / closing means for opening and closing the bypass passage on the inflow side of the outside evaporator, and the bypass passage between the bypass passage opening / closing means and the outside evaporator. A bypass passage expansion means for decompressing the refrigerant that has been condensed by the internal condenser and the external condenser and flowed into the bypass passage, and the external condenser and the external evaporator are respectively A heat exchanger in which piping passes through a plurality of fins arranged parallel to each other at intervals, and end plates arranged on both sides of the fins, and the end plate for the outside condenser and the outside of the warehouse Said end play for evaporator While connected to the vending machine, characterized in that the pipe of the outside-compartment evaporator and the fins the pipes of the outside-compartment condenser penetrates is not connected to the said fins therethrough. 2. The vending machine according to claim 1, wherein the pipe for the external condenser is arranged on the windward side and the pipe for the external evaporator is on the leeward side. The bypass passage opening / closing means is opened only when the refrigerant discharged from the compressor flows to the external condenser via the internal condenser. The vending machine described. The pipe for the outside condenser and the pipe for the outside evaporator are configured so that the refrigerant flows through the pipe from the top to the bottom, respectively. The vending machine according to any one of the above.

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