JP2011065429A - Vending machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost and low-power consumption vending machine collecting a leaking refrigerant accumulated in a condenser to a refrigerant circulation circuit. <P>SOLUTION: In the vending machine, a cooling circulation circuit is constructed of a compressor 61, the condenser 62 arranged on the outside of a container, a fixed type expansion means expanding a refrigerant via a cooling solenoid valve 70, a cooling-only evaporator 65c, and heating and cooling internal heat exchangers 65a and 65b, and a heating and cooling circulation circuit for performing heat pump operation is constructed of the cooling circulation circuit, the internal heat exchangers condensing a compressed refrigerant from the compressor, the fixed type expansion means expanding the condensed refrigerant, and the evaporator. In the vending machine, bypass pipe lines 60D and 60E bypassing a line between the outlet side of the condenser and the inlet side of the compressor through a bypass solenoid 78 and a bypass electronic expansion valve 79 are connected, and the leaking refrigerant in the condenser is collected to the refrigerant circulation circuit. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vending machine that sells a product such as a beverage in a container such as a can, a bottle, a pack, or a plastic bottle after being cooled or heated in a refrigerant circuit.

  Reducing carbon dioxide emissions has become a challenge with recent global warming, and energy-saving vending machines have been developed. As one of the methods, a heat pump type vending machine that uses the heat of the condenser, which has been exhausted in the past, to heat the inside of the cabinet has attracted attention (for example, see Patent Document 1).

  The vending machine disclosed in Patent Document 1 uses a condenser when cooling all the interior rooms, and pauses the condenser when operating a heat pump, and uses an external heat exchanger. Yes. In this circuit, the refrigerant is stored in the condenser due to the refrigerant leakage of the solenoid valve connected to the upstream side of the condenser that is at rest. In order to return the stored refrigerant to the circulation circuit, the opening degree of the electronic expansion valve is adjusted at the time of switching the operation setting mode for cooling and heating.

  However, since this type of vending machine uses two electronic expansion valves dedicated to cooling and for cooling and heating, there is a problem that costs increase. Therefore, as shown in FIG. 9, it is conceivable to provide a fixed expander (capillary) on the inlet side of the internal heat exchanger.

  The circuit shown in the figure includes a cooling circuit 60A that only cools the inside of the cabinet and a heating / cooling circuit 60B that simultaneously performs cooling and heating inside the cabinet (performs a heat pump operation). In addition, the enclosure of the dotted line in a figure shows the goods storage 40a, 40b, 40c typically, and Ta, Tb, Tc has shown the internal temperature sensor.

  The cooling circuit 60A is connected to the flow divider 63 via the compressor 61, the condenser electromagnetic valve 68, the condenser 62, and the check valve 71g, and is fixed to the cooling electromagnetic valves 70a, 70b, and 70c from the flow divider 63. Are connected to the internal heat exchangers 65a, 65b, and the evaporator 65c via the type expanders 64a, 64b, 64c, and the outlet solenoid valve 72a from the evaporator 65c and the internal heat exchanger 65a, This is a circuit that collects the piping via 72b by the aggregator 67 and then returns to the compressor 61 via the accumulator 69.

  On the other hand, in addition to the cooling circulation circuit 60A, the heating / cooling circulation circuit 60B is connected in parallel to the condenser electromagnetic valve 68 from the compressor 61 and connected to the internal heat exchangers 65a, 65b via the heating electromagnetic valves 68a, 68b. Then, the pipes connected to the internal heat exchangers 65b and 65a via the check valves 71a and 71b and connected to the flow divider 63 from the connection point via the auxiliary heat exchanger 76 and the check valve 71k. Is provided.

  Thus, the heating / cooling circulation circuit 60B is connected to the internal heat exchangers 65a, 65b from the compressor 61 via the heating electromagnetic valves 68b, 68a, and the check valves 71a, 71b are connected to the internal heat exchangers 65a, 65b. Are connected to the flow divider 63 via the auxiliary heat exchanger 76 and the check valve 71k, and are connected to the evaporator 65c via the cooling electromagnetic valve 70c from the flow divider 63, the collector 67, and the accumulator 69. Is a circuit that returns to the compressor 61 via.

JP 2006-011493 A

    However, in this vending machine, the refrigerant leaked from the condenser solenoid valve 68 and stored in the condenser 62 that is stopped during the heat pump operation is stored in the refrigerator during the cooling operation because the outlet side of the condenser 62 has a negative pressure. The heat exchanger 65a (or 65b) and the evaporator 65c are equally distributed and flow in. Since the in-compartment heat exchanger 65a (or 65b) and the evaporator 65c have different in-compartment loads, a difference in cooling rate occurs, and an excessive amount of refrigerant is supplied to the heat exchanger with a small in-compartment load. As a result, there is a problem that power consumption increases.

  In view of the above circumstances, an object of the present invention is to solve the above-described problems and to provide a vending machine with low cost and low power consumption.

In order to achieve the above object, a vending machine according to claim 1 of the present invention has at least one product storage dedicated for cooling and a plurality of product storage combined with cooling and heating. A vending machine that selectively cools or heats the product storage according to the operation mode,
A compressor that compresses the refrigerant, a condenser that is provided outside the refrigerator to condense the refrigerant, a flow divider that distributes the refrigerant condensed from the condenser, and a fixed expansion means that expands the refrigerant via a cooling electromagnetic valve; An evaporator provided in a cooling-only product storage for evaporating the expanded refrigerant, a plurality of internal heat exchangers provided in a cooling / heating product storage for evaporating the expanded refrigerant, and an accumulator for separating gas and liquid And constitute a cooling circuit,
The cooling circuit, the internal heat exchanger for condensing the refrigerant compressed from the compressor, the fixed expansion means for expanding the condensed refrigerant, and heating for performing a heat pump operation in the evaporator In vending machines that have a cooling circuit,
A bypass conduit for bypassing the outlet side of the condenser and the inlet side of the compressor via a bypass solenoid valve and a bypass electronic expansion valve is connected.

The vending machine according to claim 2 of the present invention is characterized in that, in claim 1, the bypass pipe connects the outlet side of the condenser and the inlet side of the evaporator.
The vending machine according to claim 3 of the present invention is characterized in that, in claim 2, the bypass pipe connects the outlet side of the condenser and the inlet side of the accumulator.

  A vending machine according to a fourth aspect of the present invention is the second bypass pipe according to the second aspect, wherein the second bypass pipe bypasses the outlet side of the condenser and the inlet side of the accumulator via a second bypass solenoid valve. It is characterized by connecting roads.

  The vending machine according to claim 1 or 2 according to the present invention is provided with a bypass line that bypasses between the outlet side of the condenser and the inlet side of the compressor via a bypass solenoid valve and a bypass electronic expansion valve. By connecting, the refrigerant | coolant stored in the dormant condenser can hold | maintain the refrigerant | coolant circulation amount appropriately according to the load in a warehouse, Therefore The power consumption of a vending machine can be reduced.

  In the vending machine according to claim 3 of the present invention, the bypass pipe connects the outlet side of the condenser and the inlet side of the accumulator, so that the refrigerant leaking in the idle condenser is circulated. As a result, it is possible to suppress an increase in power consumption of the vending machine.

  A vending machine according to a fourth aspect of the present invention is the second bypass pipe according to the second aspect, wherein the second bypass pipe bypasses the outlet side of the condenser and the inlet side of the accumulator via a second bypass solenoid valve. By connecting the passages, the refrigerant stored in the condenser during the stop can appropriately maintain the refrigerant circulation amount corresponding to the load in the warehouse, so that the power consumption of the vending machine can be reduced. At the same time, the promotion of frosting of the evaporator accompanying an increase in the cooling rate can be suppressed, and as a result, a decrease in cooling efficiency can be suppressed.

1 is a perspective view showing a vending machine according to an embodiment of the present invention. Sectional drawing of the vending machine shown in FIG. 1 is a refrigerant circuit diagram according to Embodiment 1 of the present invention. FIG. The block diagram of a control apparatus. The circuit diagram which shows the flow of the refrigerant | coolant in the cooling single operation which cools all three chambers. The circuit diagram which shows the flow of the refrigerant | coolant in the heat pump driving | operation which cools 2 chambers and heats 1 chamber. The refrigerant circuit figure which concerns on Example 2 of this invention. The refrigerant circuit figure which concerns on Example 3 of this invention. The refrigerant circuit figure concerning a prior art.

Example 1
Exemplary embodiments of a vending machine according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.

  First, a vending machine according to the first embodiment of the present invention will be described. 1 is a perspective view showing a vending machine according to the first embodiment of the present invention, a cross-sectional view of FIG. 2, and a refrigerant circuit diagram of FIG. 3. The vending machine is formed as a rectangular heat insulator having an open front surface. The main body cabinet 10, the outer door 20 and the inner door 30 provided on the front surface thereof, and the inside of the main body cabinet 10 are partitioned by the bottom plate 11 in two upper and lower stages, and the upper part is partitioned by, for example, two heat insulating partition plates 40 w Three independent commodity storages 40a, 40b, and 40c, a machine room 50 that houses a cooling / heating unit 60 that cools or heats the commodity storages 40a, 40b, and 40c in the lower part, and the inside of the outer door 20 And a control means 90 for controlling the cooling and heating operation of the vending machine by the temperature sensors Ta, Tb, Tc in the product storages 40a, 40b, 40c.

  More specifically, the outer door 20 is used to open and close the front opening of the main body cabinet 10 and is not shown in the figure. Product display room, selection button for selecting the product to be sold, money slot for inserting money, product outlet 21 for taking out the paid-out product, etc. Is arranged.

  The inner door 30 opens and closes the front surfaces of the product storage units 40a, 40b, and 40c to keep the products in the interior warm. The inner door 30 is a box-shaped structure that is divided into upper and lower stages and has a heat insulator inside. The upper inner door 30a is pivotally supported by the outer door 20 at one end and engaged with the outer door 20 at the other end, and the upper inner door 30a is opened simultaneously with the opening of the outer door 20 to replenish the goods. To make it easier. The lower inner door 30b is in a closed state when one end is pivotally supported on the main body cabinet 10 and the other end is hooked on the main body cabinet 10 with a latch (not shown) and the outer door 20 is opened. This prevents the cooled or heated air in the product storage boxes 40a, 40b, and 40c from flowing out, and can be opened as needed during maintenance.

  The product storage units 40a, 40b, and 40c are for storing products such as canned beverages and beverages containing plastic bottles while maintaining the desired temperature, and the capacity of the storage units is the product storage units 40c, 40a. , 40b in a large manner. In this embodiment, the product storage case 40c is exclusively used for cooling, and the product storage cases 40a and 40b are also used for cooling and heating. The product storage racks 40a, 40b, and 40c store the products in a manner that they are arranged in the vertical direction, and are provided with a product storage rack R that includes a product delivery mechanism for discharging the products one by one in response to a sales signal. There is a product carry-out chute 42 for carrying the discharged product S to the sales port 21 of the outer door through a carry-out door 31 installed in the inner door 30b.

  The cooling / heating unit 60 includes a compressor 61, a condenser 62, a flow divider 63, fixed expanders (expansion means) 64a, 64b, 64c, an accumulator 69, a condenser electromagnetic valve 68, and a heating electromagnetic valve. 68a, 68b, cooling solenoid valves 70a, 70b, 70c, outlet solenoid valves 72a, 72b, an auxiliary heat exchanger 76, a bypass electronic expansion valve 79, and the like are installed, and the internal heat exchanger is straddled across the bottom plate 11 in the interior. It has 65a, 65b, the evaporator 65c, and is comprised by connecting each apparatus with refrigerant | coolant piping. The cooling / heating unit 60 cools or heats the product S in the product storage rack R by circulating cold air or warm air in the cabinet according to the set operation mode of cooling and heating.

  The compressor 61 for cooling and heating is for compressing the refrigerant and circulating it in the circuit. When using a chlorofluorocarbon refrigerant, it is used at an evaporation temperature of about −10 ° C. and a condensation temperature of about 40 ° C. during the cooling operation. In the heating operation, the evaporation temperature is about -10 ° C and the condensation temperature is about 70 ° C.

  The condenser 62 is a fin tube type heat exchanger, and discharges unnecessary condensation heat during the cooling operation. A fan 62f is installed at the rear of the condenser 62. The fan 62f sucks air from the front opening of the machine chamber 50, sucks heat of condensation by the condenser 62, and absorbs exhaust heat of the compressor 61. Thus, the air is exhausted to the rear opening of the machine room 50.

The flow divider 63 is for distributing the condensed refrigerant to the fixed expanders 64a, 64b, and 64c. The fixed expanders 64a, 64b, and 64c are adiabatically expanded by reducing the pressure of the refrigerant that passes during the cooling operation. For example, a capillary or a fixed expansion valve.

  The internal heat exchangers 65a and 65b are for cooling or heating the product storages 40a and 40b, and the evaporator 65c is for cooling the product storage 40c. The internal heat exchangers 65a and 65b and the evaporator 65c are installed at the bottom of each product storage, surrounded by a wind tunnel 67, a fan 65f is installed behind them, and a duct 67d is installed behind them. It has been installed. As for cooling and heating in the product storage, the air cooled or heated by the internal heat exchangers 65a and 65b and the evaporator 65c is blown to the product S in the product storage, as shown by the arrows in FIG. This is done by collecting from the duct 67d.

  The accumulator 69 is a sealed container for flowing in the refrigerant evaporated from the internal heat exchangers 65a and 65b and the evaporator 65c, separating the gas and liquid, storing the liquid refrigerant, and returning the gas refrigerant to the compressor 61. is there. The accumulator 69 is also a container for storing the refrigerant remaining in the refrigerant circulation of the circuit.

  The auxiliary heat exchanger 76 is a fin tube type heat exchanger, and discharges unnecessary condensation heat during heating operation. Further, the volume of the auxiliary heat exchanger 76 is smaller than that of the condenser 62.

  The inside temperature sensors Ta, Tb, Tc are installed on the upper surface of the wind tunnel 67 in the product storage 40a, 40b, 40c, and are used to detect the inside temperature of the product storage 40a, 40b, 40c. is there.

  The condenser solenoid valve 68 opens and closes the refrigerant passage between the compressor 61 and the condenser 62, and the heating solenoid valves 68a and 68b are compressed between the compressor 61 and the internal heat exchangers 65b and 65a. It opens and closes the refrigerant passage. The cooling solenoid valves 70a, 70b, 70c open and close the passage of the refrigerant condensed by the flow divider 63, and the outlet solenoid valves 72a, 72b evaporate between the internal heat exchangers 65a, 65b and the compressor 61. It opens and closes the refrigerant passage.

  The refrigerant circuit configuration of the cooling / heating unit 60 will be described in detail with reference to FIG. The refrigerant circuit configuration includes a cooling circuit 60A for cooling only operation that only cools the inside of the cabinet, a heating and cooling circulation circuit 60B for heat pump operation that simultaneously performs cooling and heating inside the cabinet, and a pressure avoidance pipe that avoids abnormal pressure in the compressor 61. The passage 60C has a bypass pipeline 60D for returning the refrigerant stored in the condenser 62 to the circulation circuit. In addition, the enclosure of the dotted line in the figure has shown typically goods storage 40a, 40b, 40c.

  The cooling circuit 60A is connected to the flow divider 63 via the compressor 61, the condenser electromagnetic valve 68, the condenser 62, and the check valve 71g, and is fixed to the cooling electromagnetic valves 70a, 70b, and 70c from the flow divider 63. It is connected to the internal heat exchangers 65a, 65b and the evaporator 65c via the type expanders 64a, 64b and 64c, and the piping from the evaporator 65c and the outlet solenoid valve 72a from the internal heat exchangers 65a and 65b. , 72b and the pipe through the accumulator 69 after being collected by the collector 67.

  On the other hand, in the heating / cooling circulation circuit 60B, in addition to the cooling circulation circuit 60A, the internal heat exchangers 65a and 65b are connected to the internal heat exchangers 65a and 65b via the heating electromagnetic valves 68a and 68b connected in parallel with the condenser electromagnetic valve 68 from the compressor 61. Connected and connected from the internal heat exchangers 65a and 65b via check valves 71a and 71b, and connected to the flow divider 63 from the connection point via the auxiliary heat exchanger 76 and check valve 71k There is a road.

Thus, the heating / cooling circulation circuit 60B is connected to the internal heat exchangers 65a, 65b from the compressor 61 via the heating electromagnetic valves 68a, 68b, and the check valves 71a, 71b are connected to the internal heat exchangers 65a, 65b. To the flow divider 63 via the auxiliary heat exchanger 76 and the check valve 71k, and from the flow divider 63 to the evaporator 65c via the cooling electromagnetic valve 70c and the fixed expander 64c. The circuit returns to the compressor 61 via the accumulator 69.
The internal heat exchangers 65a and 65b can be used as condensers or evaporators by selectively controlling the heating electromagnetic valves 68a and 68b or the cooling electromagnetic valves 70a and 70b in the cooling heating operation setting mode. It is.

  The pressure avoidance pipe line 60C is for preventing abnormal high pressure of the compressor 61 that occurs when the condenser solenoid valve 68 and the heating solenoid valves 68a and 68b fail and is closed, and the discharge side of the compressor 61 And an inlet side of the condenser 62 through a relief valve 77.

  The relief valve 77 is closed at normal pressure, but when the compressor 61 is abnormally high in pressure, the relief valve 77 is opened to allow the condenser 62 to avoid high-pressure refrigerant from the compressor 61. Thereby, damage to the compressor 61 can be prevented.

  Further, the bypass pipe line 60D is for returning the refrigerant stored in the paused condenser 62 to the circulation circuit, from the outlet side of the condenser 62 via the bypass electromagnetic valve 78 and the bypass electronic expansion valve 79. It is a pipe line connected to the inlet side of the evaporator 65c.

The bypass solenoid valve 78 is for opening and closing the refrigerant flow in the bypass pipe line 60D.
The bypass electronic expansion valve 79 adiabatically expands the refrigerant flowing in the bypass pipe line 60D.

As the refrigerant, R134a is used as a refrigerant used within a critical pressure, for example, a fluorocarbon refrigerant. Further, a refrigerant used outside the critical pressure, for example, a carbon dioxide refrigerant may be used.
The control means 90 controls the cooling or heating of the product storages 40a, 40b, and 40c in accordance with the cooling / heating setting operation mode. As shown in FIG. 4, the CPU has a CPU and a memory therein, and controls the solenoid valve opening / closing of the refrigerant circuit, the bypass electronic expansion valve 79 and the like according to the cooling heating setting operation mode determined by the setting of the operation mode setting SW91. The set operation mode indicates the cooling or heating operation of the product storage units 40a, 40b, and 40c by C and H. For example, all the cooling operations are performed in order from the left side of the product storage unit (40a, 40b, 40c). In the case, the CCC mode is indicated. When only the left product storage is heated, the HCC mode is indicated. Further, the control means 90 controls the compressor 61, the condenser electromagnetic valve 68, the cooling electromagnetic valves 70a, 70b, 70c, the outlet electromagnetic valves 72b, 72c, the heating electromagnetic depending on the temperatures detected by the internal temperature sensors Ta, Tb, Tc. The interior temperature is maintained at an appropriate temperature by controlling the valves 68b, 68a and the like and performing thermocycle operation in which the interior is controlled to be turned ON / OFF within a certain temperature range.

  When the set operation mode is set to the CCC mode by operating the operation mode setting SW 91 with such a configuration, the control means 90 opens the condenser solenoid valve 68, the cooling solenoid valves 70a, 70b, 70c, and the outlet solenoid valves 72b, 72a, and heats them. The solenoid valves 68b and 68a and the bypass solenoid valve 78 are closed. As indicated by the thick line in FIG. 5, the high-temperature refrigerant compressed by the compressor 61 passes through the condenser electromagnetic valve 68, is condensed in the condenser 62, becomes liquid, and flows into the flow divider 63 through the check valve 71g. To do. The refrigerant divided into three directions by the flow divider 63 is expanded by the fixed expanders 64a, 64b, and 64c through the cooling electromagnetic valves 70a, 70b, and 70c to become a low-temperature gas-liquid two-phase flow, and the internal heat exchanger 65a. 65b flows into the evaporator 65c. The inflowing refrigerant evaporates in the internal heat exchangers 65a and 65b and the evaporator 65c, cools the product storages 40a, 40b and 40c, and the evaporated refrigerant collects in the collector 67 to store the liquid refrigerant. Gas-liquid separation is performed via 69 and the flow returns to the compressor 61. In this cooling, the controller 90 controls the internal temperature to an appropriate temperature by the thermocycle operation by the internal temperature sensors Ta, Tb, and Tc.

  Next, when the set operation mode is set to the HCC mode in which one chamber on the left side is heated and two chambers on the right side are cooled by operating the operation mode setting SW 91, the control means 90 includes the heating solenoid valve 68a, the cooling solenoid valve. 70b and 70c and the outlet solenoid valve 72b are opened, and the condenser solenoid valve 68, the heating solenoid valve 68b, the cooling solenoid valve 70a, the exit solenoid valve 72a, and the bypass solenoid valve 78 are closed. The refrigerant flow at this time is indicated by a thick line in FIG. The high-temperature refrigerant compressed by the compressor 61 flows into the internal heat exchanger 65a via the heating electromagnetic valve 68a. The refrigerant that has flowed in is condensed, heats the product storage 40a, is further condensed in the auxiliary heat exchanger 76 via the check valve 71a, and flows into the flow divider 63 via the check valve 71k. The refrigerant that has flowed in flows into the expanders 64b and 64c via the cooling electromagnetic valves 70b and 70c, and expands into a low-temperature gas-liquid two-phase flow. The refrigerant that has become a gas-liquid two-phase flow flows into the internal heat exchanger 65b and the evaporator 65c and is evaporated to cool the commodity storages 40b and 40c. One of the refrigerants cooling the product storages 40b and 40c is collected in the collecting unit 67 through the outlet solenoid valve 72b, and then returned to the compressor 61 through the accumulator 69. In this heat pump operation, the inside of the cabinet is maintained at an appropriate temperature by the thermocycle operation as described above.

  Then, the control device 90 sets the opening degree of the bypass electronic expansion valve 79 corresponding to the inside temperatures Tb, Tc of the product storages 40b, 40c during the cooling operation, and the bypass electromagnetic valve for a predetermined time during the heat pump operation. 78 is opened and closed. At this time, the refrigerant stored in the condenser 62 flows out from the outlet of the condenser 62 to the bypass conduit 60D as indicated by the dotted line arrow in the figure, and is expanded by the bypass electronic expansion valve 79 to be gas-liquid two. It becomes a phase flow and flows into the evaporator 65c in the commodity storage 40c having the largest heat load to cool the interior. By adjusting the bypass electronic expansion valve 79, the amount of refrigerant flowing into the evaporator 65c and the internal heat exchanger 65b is controlled in accordance with the internal load, so the internal heat exchangers 65a and 65b and the evaporator 65c As a result of appropriately maintaining the circulating amount of flowing refrigerant, the power consumption of the vending machine is reduced.

The predetermined time for opening the bypass solenoid valve 78 may be at the time when the compressor starts operation or immediately before the operation is stopped. Further, it may be opened at all times during the heat pump operation.
(Example 2)
A vending machine according to the second embodiment of the present invention will be described. The difference from the first embodiment is that the bypass pipe 60E is installed on the outlet side of the condenser 62 and the collector 67, and the explanation will be described in detail using the refrigerant circuit of FIG. Since this is substantially the same as that of the first embodiment, the description thereof is omitted.

As shown in FIG. 7, the bypass pipe line 60 </ b> E is a pipe line connected from the outlet side of the condenser 62 to the outlet side of the collector 67 via the bypass electromagnetic valve 78 and the bypass electronic expansion valve 79.
In this refrigerant circuit, when the set operation mode is set to the HCC mode in which the left one chamber is heated and the middle and right two chambers are cooled by operating the operation mode setting SW 91, the control means 90 includes the heating electromagnetic valve 68a, the cooling The electromagnetic valves 70b and 70c and the outlet electromagnetic valve 72b are opened, and the condenser electromagnetic valve 68, the heating electromagnetic valve 68b, the cooling electromagnetic valve 70a, the outlet electromagnetic valve 72a, and the bypass electromagnetic valve 78 are closed. The refrigerant flow at this time is indicated by a thick line in FIG. The high-temperature refrigerant compressed by the compressor 61 flows into the internal heat exchanger 65a via the heating electromagnetic valve 68a. The refrigerant that has flowed in is condensed, heats the product storage 40a, is further condensed in the auxiliary heat exchanger 76 via the check valve 71a, and flows into the flow divider 63 via the check valve 71k. The refrigerant that has flowed in flows into the expanders 64b and 64c via the cooling electromagnetic valves 70b and 70c, and expands into a low-temperature gas-liquid two-phase flow. The refrigerant that has become a gas-liquid two-phase flow flows into the internal heat exchanger 65b and the evaporator 65c and is evaporated to cool the product storage units 40b and 40c. One of the refrigerants cooling the product storages 40b and 40c is collected in the collecting unit 67 through the outlet solenoid valve 72b, and then returned to the compressor 61 through the accumulator 69.

  Then, the control device 90 sets the opening degree of the bypass electronic expansion valve 79 corresponding to the inside temperatures Tb, Tc of the product storages 40b, 40c during the cooling operation, and opens and closes the bypass solenoid valve 78 at a predetermined time. To do. At this time, the refrigerant stored in the condenser 62 flows out from the outlet of the condenser 62 to the bypass pipe 60D, expands in the bypass electronic expansion valve 79, becomes a gas-liquid two-phase flow, and flows into the accumulator 69. . Since the refrigerant that has leaked in the condenser during the rest returns to the circuit in which the refrigerant circulates, the refrigerant circulation amount is not reduced. As a result, an increase in power consumption of the vending machine can be suppressed.

  Compared to the first embodiment, the cooling rate of the evaporator 65c is reduced by the amount that the leaked refrigerant does not flow into the evaporator 65c. However, the promotion of frosting of the evaporator 65c accompanying the increase in the cooling rate can be suppressed. As a result, a decrease in cooling efficiency can be suppressed.

(Example 3)
A vending machine according to Embodiment 3 of the present invention will be described. The difference from the first embodiment is that, in addition to the bypass pipeline 60D, the second bypass pipeline 60F is connected between the outlet side of the condenser 62 and the outlet side of the collector 67, The description will be made in detail with reference to the refrigerant circuit of FIG.

  As shown in FIG. 8, the bypass pipe line 60F passes through the second bypass solenoid valve 78v and the second bypass electronic expansion valve 79v from the middle point between the condenser 62 and the bypass solenoid valve 78, and exits from the collector 67. It is a pipe line connected to the side.

  In this refrigerant circuit, when the set operation mode is set to the HCC mode in which the left one chamber is heated and the middle two right chambers are cooled by operating the operation mode setting SW 91, the control means 90 includes the heating electromagnetic valve 68a, the cooling The electromagnetic valves 70b and 70c and the outlet electromagnetic valve 72b are opened, and the condenser electromagnetic valve 68, the heating electromagnetic valve 68b, the cooling electromagnetic valve 70a, the outlet electromagnetic valve 72a, and the bypass electromagnetic valve 78 are closed. The refrigerant flow at this time is indicated by a thick line in FIG. The high-temperature refrigerant compressed by the compressor 61 flows into the internal heat exchanger 65a via the heating electromagnetic valve 68a. The refrigerant that has flowed in is condensed, heats the product storage 40a, is further condensed in the auxiliary heat exchanger 76 via the check valve 71a, and flows into the flow divider 63 via the check valve 71k. The refrigerant that has flowed in flows into the expanders 64b and 64c via the cooling electromagnetic valves 70b and 70c, and expands into a low-temperature gas-liquid two-phase flow. The refrigerant that has become a gas-liquid two-phase flow flows into the internal heat exchanger 65b and the evaporator 65c and is evaporated to cool the product storage units 40b and 40c. One of the refrigerants that cool the product storages 40b and 40c is collected through the outlet solenoid valve 72b, and the other is collected in the collecting unit 67 as it is, and then returned to the compressor 61 through the accumulator 69.

  Then, the control device 90 sets the opening degree of the bypass electronic expansion valve 79 corresponding to the inside temperatures Tb, Tc of the product storages 40b, 40c during the cooling operation, and the bypass electromagnetic valve for a predetermined time during the heat pump operation. 78 is opened and closed. At this time, the refrigerant stored in the condenser 62 flows out from the outlet of the condenser 62 to the bypass conduit 60D as indicated by the dotted line arrow in the figure, and is expanded by the bypass electronic expansion valve 79 to be gas-liquid two. It becomes a phase flow and flows into the evaporator 65c in the commodity storage 40c having the largest heat load to cool the interior. When the internal temperature Tc reaches a frosting temperature, the controller 90 closes the bypass solenoid valve 78, opens the second bypass solenoid valve 78v, and opens the second bypass electronic expansion valve 79v. The degree of adjustment is adjusted so that the leaked refrigerant in the condenser 62 is returned to the compressor 61 without passing through the evaporator 65c. As a result, the promotion of frosting of the evaporator 65c accompanying an increase in the cooling rate can be suppressed, and as a result, a decrease in cooling efficiency can be suppressed.

  In the third embodiment, the bypass electronic expansion valve 79 and the second bypass electronic expansion valve 79v can also be used as a bypass pipe. Specifically, the arrangement of the bypass electronic expansion valve 79 and the bypass electromagnetic valve 78 in FIG. 8 is reversed so that the intermediate between the bypass electromagnetic valve 78 and the bypass electronic expansion valve 79, the outlet side of the collector 67, and the second What is necessary is just to provide the 2nd bypass pipe line connected via the bypass electromagnetic valve 78v. This circuit can achieve the same effect as described above.

  As described above, the vending machine according to the present invention is suitable for cooling or heating a product such as a beverage contained in a container such as a can, a bottle, a pack, or a plastic bottle in a refrigerant circuit.

DESCRIPTION OF SYMBOLS 10 Main body cabinet 20 Outer door 30 Inner door 40a, 40b, 40c Goods storage 60 Cooling / heating unit 60D, 60E Bypass line 60F Second bypass line 61 Compressor 62 Condenser 63 Current divider 64a, 64b, 64c Expansion 65a, 65b Inside heat exchanger 65c Evaporator 68 Condenser solenoid valve 68a, 68b Heating solenoid valve 70a, 70b, 70c Cooling solenoid valve 72b, 72c Outlet solenoid valve 78 Bypass solenoid valve 78v Second bypass solenoid valve 79 Bypass Electronic expansion valve 79v Second bypass Electronic expansion valve 90 Controller 91 Operation mode selection SW

Claims (4)

A vending machine having at least one product storage dedicated to cooling and a plurality of product storage combined with cooling and heating, and selectively cooling or heating the product storage according to a setting operation mode of cooling and heating,
A compressor that compresses the refrigerant, a condenser that is provided outside the refrigerator to condense the refrigerant, a flow divider that distributes the refrigerant condensed from the condenser, and a fixed expansion means that expands the refrigerant via a cooling electromagnetic valve; An evaporator provided in a cooling-only product storage for evaporating the expanded refrigerant, a plurality of internal heat exchangers provided in a cooling / heating product storage for evaporating the expanded refrigerant, and an accumulator for separating gas and liquid And constitute a cooling circuit,
The cooling circuit, the internal heat exchanger for condensing the refrigerant compressed from the compressor, the fixed expansion means for expanding the condensed refrigerant, and heating for performing a heat pump operation in the evaporator In vending machines that have a cooling circuit,
A vending machine characterized in that a bypass pipe is connected between the outlet side of the condenser and the inlet side of the compressor via a bypass solenoid valve and a bypass electronic expansion valve. 2. The vending machine according to claim 1, wherein the bypass pipe connects the outlet side of the condenser and the inlet side of the evaporator. 2. The vending machine according to claim 1, wherein the bypass pipe connects the outlet side of the condenser and the inlet side of the accumulator. The vending machine according to claim 2, wherein a second bypass pipe for bypassing the outlet side of the condenser and the inlet side of the accumulator via a second bypass solenoid valve is connected. .