JP4548540B2 - vending machine - Google Patents

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).

As shown in FIG. 7, the vending machine disclosed in Patent Document 1 includes a compressor 11z that compresses a refrigerant, a condenser 12z that is provided outside the refrigerator and condenses the refrigerant, and a refrigerant path to the condenser 12z. A capillary tube (expansion means) 16Az, 16Bz that branches in two directions via a solenoid valve 19z that opens and closes and a distributor 64z that distributes the refrigerant from the condenser 12z and expands the refrigerant via the electromagnetic valves 15Az and 15Bz. The heat exchangers (internal heat exchangers) 8Az and 8Bz for evaporating the refrigerant, the piping through the solenoid valve 20z from the heat exchanger 8Az and the outlet piping from the heat exchanger 8Bz join at the junction 67z, and the compressor A cooling circulation circuit returning to 11z is configured. Furthermore, a hot gas bypass pipe (pipe) for connecting the compressor 11z and the heat exchanger 8Az via the electromagnetic valve 17az, and a pipe for connecting the heat exchanger 8Az and the condenser 12z via the electromagnetic valve 18z Thus, a heating / cooling circuit that performs the heat pump operation with the heat exchanger 8Az acting as a condenser is configured.

As the electromagnetic valves 15Az and 15Bz, a normal low-cost direct acting electromagnetic valve 80 as shown in FIG. 8 is used. As shown in the figure, the direct acting solenoid valve 80 has a cylindrical cylinder 81a inside a solenoid valve main body 81, and an inlet 81b is connected to the side end face of the cylinder 81a, and an outlet 81c is connected to the lower surface. A valve seat 81d is formed in the shape of a truncated cone on the peripheral edge of the upper surface of the outlet portion 81c. Inside the cylinder 81 a, a spherical valve body 82 that comes into contact with the valve seat 81 d and a spool 83 that is attached to the valve body 82 and biases the valve body 82 with gravity and a spring 84 are inserted. An iron armature 85 is connected to the spool 83, and a solenoid 86 is provided on the upper peripheral side of the armature 85.

When the solenoid 86 is in a non-energized state, as shown in FIG. 8A, the valve body 82 is brought into contact with the valve seat 81d by the gravity of the spring 84 and the spool 83, so that the inlet portion 81b and the outlet portion 81c The communication is sealed. When the solenoid 86 is energized, the armature 85 is attracted and moved upward by the magnetic force of the solenoid 86 as shown in FIG. 8B, so that a gap is formed between the valve body 82 and the valve seat 81d, and the inlet The part 81b and the outlet part 81c communicate with each other, and the refrigerant can pass therethrough.

In such a configuration, in order to perform the heat pump operation with the heat exchanger 8Az acting as a condenser and the heat exchanger 8Bz acting as an evaporator in FIG. 7, the electromagnetic valves 15Bz, 17az, and 18z are opened (ON). The electromagnetic valves 15Az, 19z, and 20z are closed (OFF). The refrigerant at this time flows in the circuit as shown by the thick line in the figure, is compressed by the compressor 11z to become a high-temperature and high-pressure refrigerant, condenses in the internal heat exchanger 8Az via the electromagnetic valve 17az, Heat. The refrigerant condensed in the internal heat exchanger 8Az further condenses in the condenser 12z via the electromagnetic valve 18z, expands in the expansion means 16Bz via the branch point 64z and the electromagnetic valve 15Bz, and is cooled at low temperature and low pressure. The refrigerant evaporates in the internal heat exchanger 8Bz and cools the interior. The refrigerant evaporated in the internal heat exchanger 8Bz returns to the compressor 11z through the junction portion 67z.

Japanese Patent Laid-Open No. 5-233941

However, since this type of vending machine requires one capillary tube for each heat exchanger in the warehouse, the cost increases. Therefore, by connecting the capillary tube 16Cz between the condenser 12z and the branch point 64z instead of the capillary tubes 16Az and 16Bz as shown in FIG. 9, it is possible to use a single capillary tube.

In such a configuration, in order to perform the heat pump operation by causing the heat exchanger 8Az to act as a condenser and the heat exchanger 8Bz to act as an evaporator, the solenoid valves 15Bz, 17az, and 18z are opened (ON), and the solenoid valve 15Az, 19z, and 20z are closed (OFF). The refrigerant at this time flows in the circuit as shown by the thick line in the figure, is compressed by the compressor 11z to become a high-temperature and high-pressure refrigerant, condenses in the heat exchanger 8Az through the electromagnetic valve 17az, Heat. The refrigerant condensed in the heat exchanger 8Az is further condensed in the condenser 12z via the electromagnetic valve 18z, and expands in the capillary tube 16Cz to become a low-temperature and low-pressure refrigerant, and passes through the branch point 64z and the electromagnetic valve 15Bz. Then, it evaporates in the heat exchanger 8Bz and cools the inside of the refrigerator. The refrigerant evaporated in the heat exchanger 8Bz returns to the compressor 11z through the junction 67z.

However, during operation of the heat pump, as shown in FIG. 9, when the pressure of the inlet side piping of the internal heat exchanger 8Az is P ₁ and the pressure of the branching portion 64z is P ₂ , the outlet of the electromagnetic valve 15Az that is closed High pressure P ₁ is applied to the side and low pressure P ₂ is applied to the inlet side. This reverse pressure pushes up the valve body 82 in the same manner as in FIG. 8B, and a gap is formed between the valve seat 81d. When the gap is formed, the outlet side and the inlet side communicate with each other and have the same pressure. Therefore, the valve body 82 again comes into contact with the valve seat 81 to close the passage. Then, since a reverse pressure is formed again, the vibration of pushing up and pushing back the valve body 82 is repeated. This phenomenon has continued during the heat pump operation, and there is a concern that an annoying sound (hereinafter referred to as abnormal noise) generated when the valve body 82 collides with the valve seat 81 may continue to be generated. In order to prevent this, it is conceivable to use a large solenoid valve that is resistant to back pressure, but this increases the cost. In addition, it is conceivable to connect a bypass pipe of a fine pipe to the outlet side and the inlet side of the solenoid valve to suppress the reverse pressure. However, since an unintended refrigerant flow is possible, energy loss (increased power consumption) is called. Issues arise.

In addition, it is conceivable to connect a check valve between the solenoid valve 15Az and the branching portion 64z to suppress the reverse pressure. However, a slight amount of refrigerant leaks in the check valve. Since reverse pressure is applied to the electromagnetic valve 15Az, abnormal noise continues to be generated although the frequency is reduced.

In view of the above circumstances, an object of the present invention is to provide an automatic vending machine that solves the above-described problems, suppresses noise from the electromagnetic valve, and can operate a compressor at low cost and high reliability. And

In order to achieve the above object, a vending machine according to claim 1 of the present invention has a product storage that is also used for cooling and heating, and selectively cools or heats the product storage according to an operation mode of cooling and heating. A vending machine that compresses refrigerant, a condenser that is provided outside the refrigerator and that condenses refrigerant via a condenser solenoid valve, expansion means that expands the refrigerant, and refrigerant that is expanded by the expansion means is distributed A plurality of in-compartment heat exchangers that evaporate the refrigerant from the distributor through the cooler inlet solenoid valve and the check valve, and the evaporated refrigerant through the cooler outlet solenoid valve. A cooling circulation circuit is formed by the merger, and the cooling circulation circuit is connected to the cooling circulation circuit via a heater solenoid valve between the compressor and the internal heat exchanger inlet side, and The second expansion between the outlet side of the internal heat exchanger and the distributor By connecting the pipes through the stages, a heating / cooling circulation circuit that operates the heat pump by operating the internal heat exchanger as a condenser is configured, and the compressor, the condenser solenoid valve, and the condenser inlet electromagnetic In the vending machine having a control device for controlling the valve, the cooler outlet solenoid valve, and the heater solenoid valve, the control device operates the heat exchanger as a condenser to perform a heat pump operation. The heater electromagnetic valve connected to the internal heat exchanger is opened, and the cooler inlet electromagnetic valve connected to the internal heat exchanger is also opened and operated.

The vending machine according to claim 1 of the present invention opens the heater solenoid valve connected to the internal heat exchanger when the internal heat exchanger acts as a condenser to perform the heat pump operation. At the same time, by opening and operating the cooler inlet solenoid valve connected to the internal heat exchanger, the back pressure generated at the cooler inlet solenoid valve is drastically reduced, and abnormal noise is generated from the solenoid valve. Can be suppressed at low cost.

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 an embodiment of the present invention will be described. 1 is a perspective view showing a vending machine according to an embodiment of the present invention, FIG. 2 is a sectional view of the vending machine shown in FIG. 1, and FIG. 3 is a refrigerant circuit diagram. FIG. 4 is a block diagram of the control device, FIG. 5 is a circuit diagram showing the flow of refrigerant in the cooling operation for cooling all three chambers, and FIG. 6 is in the heat pump operation for cooling one chamber and heating two chambers. It is a circuit diagram which shows the flow of a refrigerant | coolant.

In these drawings, the vending machine includes a main body cabinet 10 formed as a rectangular heat insulator having an open front surface, an outer door 20 and an inner door 30 provided on the front surface, and an interior of the main body cabinet 10 in two directions. The bottom plate 11 is partitioned and formed at the stage, and the upper part is cooled by, for example, three independent product storage units 40a, 40b, and 40c separated by two heat insulating partition plates 40w, and the lower part product storage units 40a, 40b, and 40c are cooled or Cooling / heating of the vending machine by the temperature sensor Ta, Tb, Tc disposed inside the machine room 50 for storing the cooling / heating unit 60 for heating and the outer door 20 and in the product storages 40a, 40b, 40c. And control means 90 for controlling operation and the like.

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 pivoted at one end to the outer door 20, and the other end is engaged with the outer door 20, and the upper inner door 30a is opened at the same time as the outer door 20 is opened to facilitate replenishment of goods. It is to make. The lower inner door 30b is in a closed state when one end pivots 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. It is possible to prevent the cool air or warm air in the storage boxes 40a, 40b, 40c from flowing out, and to open as necessary during maintenance.

The product storage units 40a, 40b, and 40c are for storing products such as canned beverages and beverages containing plastic bottles at a desired temperature, and the capacity of the storage units is the product storage units 40a, 40c. , 40b in a large manner. In this embodiment, the product storage case 40a is exclusively used for cooling, and the product storage cases 40b and 40c 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, an expander (expansion means) 63, a second expander 79, an accumulator 69, and an auxiliary heat exchanger 76 in the machine room 50. The internal heat exchangers 65a, 65b, and 65c are provided in the storage across the space, and each device is connected by a refrigerant pipe. 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 cooling / heating operation mode.

The compressor 61 for cooling and heating is for compressing the refrigerant and circulating it in the circuit. During the cooling operation, the evaporation temperature is about −10 ° C., the condensation temperature is about 40 ° C., and during the heating operation, An evaporation temperature of about −10 ° C. and a condensation temperature of about 70 ° C. are used.

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 expander 63 decompresses the refrigerant passing during the cooling operation and adiabatically expands, and is, for example, a capillary, a temperature expansion valve, or an electronic expansion valve.

The flow divider 64 is for distributing the refrigerant adiabatically expanded by the expander 63 to the internal heat exchangers 65a, 65b, 65c.

The internal heat exchangers 65a, 65b, 65c are for cooling the product storage 40a, and the internal heat exchangers 65b, 65c are internal heat exchangers for heating the product storage 40b, 40c. I also use it. The internal heat exchangers 65a, 65b, 65c are installed at the lower part 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. Has been. The cooling and heating in the product storage are performed by blowing the air cooled or heated by the internal heat exchangers 65a, 65b, 65c to the product S in the product storage, and the duct 67d as shown by the arrow in FIG. It is done by more circulating recovery.

The accumulator 69 is a sealed container for flowing the refrigerant evaporated from the internal heat exchangers 65 a, 65 b and 65 c, separating the gas and liquid to store the liquid refrigerant, and returning the gas refrigerant to the compressor 61. 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.

The expander 79 decompresses the refrigerant passing during the heating operation and adiabatically expands, and is, for example, a capillary, a temperature expansion valve, or an electronic expansion valve.

The heaters 66b and 66c are installed in front of the internal heat exchangers 65b and 65c, and assist heating of the product storages 40b and 40c.

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 heater solenoid valves 68b and 68c are compressed between the compressor 61 and the internal heat exchangers 65b and 65c. It opens and closes the refrigerant passage. The cooler inlet solenoid valves 70a, 70b, 70c open and close the expanded refrigerant passage between the flow divider 64 and the internal heat exchangers 65a, 65b, 65c. The cooler outlet solenoid valves 72b, 72c It opens and closes the passage of the evaporated refrigerant between the internal heat exchangers 65b and 65c and the compressor 61. All of these solenoid valves have the structure of a direct acting solenoid valve as shown in FIG.

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 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 the figure has shown typically goods storage 40a, 40b, 40c.

The cooling circuit 60A is connected to the flow divider 64 via the compressor 61, the condenser electromagnetic valve 68, the condenser 62, and the expander 63. From the flow divider 64, the cooling inlet electromagnetic valves 70a, 70b, and 70c are connected. Via the check valves 71b and 71c (there is no check valve 71 on the outlet side of the cooler inlet electromagnetic valve 70a), the internal heat exchangers 65a, 65b and 65c are connected to the internal heat exchanger 65a. And the piping through the cooler outlet electromagnetic valves 72b and 72c from the internal heat exchangers 65b and 65c are collected by the collecting unit 67 and then returned 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 includes heating valve inlet pipes 168b, 168c connected in parallel to the condenser electromagnetic valve 68 from the compressor 61 and connected to the heater electromagnetic valves 68b, 68c, and Heater valve outlet pipes 165b and 165c for connecting the check valves 71b and 71c to the inlet side of the internal heat exchangers 65b and 65c from the heater electromagnetic valves 68b and 68c, respectively, and the internal heat exchangers 65b and 65c outlets And a pipe connected to the auxiliary heat exchanger 76 via the check valves 71 and 71, and a pipe connected to the distributor 64 from the auxiliary heat exchanger 76 via the expander 79. .

Thus, the heating / cooling circulation circuit 60B is connected from the compressor 61 to the internal heat exchangers 65c, 65b via the heater electromagnetic valves 68b, 68c, and from the internal heat exchangers 65c, 65b to the check valves 71, 71. Are connected to the distributor 64 via the auxiliary heat exchanger 76 and the expander 79, and are connected to the internal heat exchanger 65a via the cooler inlet solenoid valve 70a from the flow divider 64, This circuit returns to the compressor 61 via the accumulator 69.

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 storage boxes 40a, 40b, and 40c by the cooling and heating operation mode. As shown in FIG. 4, a CPU and a memory are provided inside, and control such as opening and closing of the solenoid valve of the refrigerant circuit is performed according to the cooling heating operation mode determined by the setting of the operation mode setting SW91. The operation mode indicates the cooling or heating operation of the product storage units 40a, 40b, and 40c by C and H, and in the order of (40a, 40b, 40c) from the left side of the product storage unit, for example, all are cooling Is described as CCC mode, and when only the left product storage is heated, it is described as HCC mode. Moreover, the control means 90 is the compressor 61, the condenser solenoid valve 68, the cooler inlet solenoid valves 70a, 70b, 70c, the cooler outlet solenoid valve 72b, depending on the temperatures detected by the internal temperature sensors Ta, Tb, Tc. 72c, heater solenoid valves 68b and 68c, etc. are controlled, and the interior temperature is maintained at an appropriate temperature by thermocycle operation in which the interior is controlled to be ON / OFF within a certain temperature range.

With this configuration, when the operation mode is set to the CCC mode by operating the operation mode setting SW 91, the control unit 90 opens the condenser solenoid valve 68, the cooler inlet solenoid valves 70a, 70b, 70c, and the cooler outlet solenoid valves 72b, 72c. Then, the heater solenoid valves 68b and 68c are closed. As shown by the thick line in FIG. 5, the high-temperature refrigerant compressed by the compressor 61 is condensed by the condenser 62 to become a liquid, expands by the expander 63, and becomes a low-temperature gas-liquid two-phase flow. And then flows into the internal heat exchangers 65a, 65b, 65c. The inflowing refrigerant evaporates in the internal heat exchangers 65a, 65b, and 65c, cools the product storages 40a, 40b, and 40c, and the evaporated refrigerant collects in the aggregator 67 to store the liquid refrigerant. Then, the gas and liquid are separated and returned 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 operation mode is set to CHH mode in which the operation mode is set to cool the left one chamber and the middle two right chambers are heated by operating the operation mode setting SW 91, the control means 90 is connected to the heater solenoid valves 68 b, 68 c, cooling The inlet solenoid valves 70a, 70b, and 70c are opened, and the condenser solenoid valve 68 and the cooler outlet solenoid valves 72b and 72c are closed. As shown by the thick line in FIG. 6, the high-temperature refrigerant compressed by the compressor 61 undergoes internal heat exchange via the heating valve inlet pipes 168b and 168c, the heater electromagnetic valves 68b and 68c, and the heating valve outlet pipes 165b and 165c. Flows into the containers 65b and 65c. The refrigerant flowing into the internal heat exchangers 65b and 65c condenses, heats the product storage 40b and 40c, collects via the check valves 71 and 71, further condenses in the auxiliary heat exchanger 76, and expands. 79 flow into. The refrigerant that has flowed into the expander 79 expands into a low-temperature and low-pressure gas-liquid two-phase flow and flows into the internal heat exchanger 65a via the flow divider 64 and the cooler inlet electromagnetic valve 70a. The refrigerant flowing into the internal heat exchanger 65a evaporates in the internal heat exchanger 65a, cools the product storage 40a, and returns to the compressor 61 via the collector 67 and 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.

Accordingly, as shown in FIG. 6, the high-pressure pressure on the inlet side of the internal heat exchangers 65 b and 65 c through which the refrigerant compressed by the compressor 61 flows is P ₁ and P _2, and the refrigerant expanded by the expander 79 flows. When the low pressure at the outlet of the flow divider 64 is P ₃ and P ₄ , P ₁ -P ₃ , P ₂ -P ₄ are provided between the inlet side of the internal heat exchangers 65 b and 65 c and the outlet side of the flow divider 64. Therefore, the refrigerant tends to flow to the check valves 71b and 71c and the cooler inlet electromagnetic valves 70b and 70c. Although the refrigerant flow is blocked by the check valves 71b and 71c, a part of the refrigerant becomes a leaking refrigerant, but the cooler inlet solenoid valves 70b and 70c are opened, so the cooler inlet solenoid valves 70b and 70c are opened. The back pressure between the entrance and exit of the water is drastically reduced, resulting in a very slow flow. Since the leakage flow rate is extremely small compared with the total refrigerant circulation amount, the cooling heating performance is not substantially affected. In addition, since the cooler inlet solenoid valves 70b and 70c are opened, the valve body 82 of the solenoid valve is always fixed away from the valve seat 81d, so that it does not vibrate and generate abnormal noise. .

As described above, when the heat exchangers 65b and 65c are operated as condensers and the heat pump operation is performed, the heater electromagnetic valves 68b and 68c connected to the internal heat exchangers 65b and 65c are opened. At the same time, by opening and operating the cooler inlet solenoid valves 71b and 71c connected to the internal heat exchangers 65b and 65c, the back pressure generated in the cooler inlet solenoid valves 71b and 71c is drastically reduced. Generation | occurrence | production of the noise from the cooler entrance electromagnetic valves 71b and 71c can be suppressed. Moreover, since the refrigerant circuit can be configured with a small direct acting solenoid valve, the compressor can be operated at low cost and high reliability.

In the above description, the cooling and heating operation mode is described as the CHH mode. However, the same effect can be obtained in the CCH mode and the CHC mode in which heating is performed in a single product storage. In the above description, the vending machine has a two-room product storage and cooling / heating function. However, the same effect can be obtained with a vending machine that has a one-room product storage and cooling / heating function. It is done.

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.

1 is a perspective view showing a vending machine according to an embodiment of the present invention. It is sectional drawing of the vending machine shown in FIG. It is a refrigerant circuit figure concerning the example of the present invention. It is a block diagram of a control apparatus. It is a circuit diagram which shows the flow of the refrigerant | coolant in the cooling single operation which cools all the three chambers. It is a circuit diagram which shows the flow of the refrigerant | coolant in the heat pump driving | operation which cools 1 chamber and heats 2 chambers. It is a refrigerant circuit figure concerning a conventional example. The block diagram of a direct acting type solenoid valve is shown, (a) is a state when the solenoid is not energized, and (b) is a state when the solenoid is energized. It is another refrigerant circuit figure concerning a conventional example.

DESCRIPTION OF SYMBOLS 10 Main body cabinet 20 Outer door 30 Inner door 40a, 40b, 40c Goods storage 60 Cooling / heating unit 61 Compressor 62 Condenser 63, 79 Inflator 64 Shunt 65a, 65b, 65c In-house heat exchanger 68 Condenser electromagnetic Valve 68a, 68b Heater solenoid valve 70a, 70b, 70c Cooler inlet solenoid valve 72b, 72c Cooler exit solenoid valve 80 Direct acting solenoid valve 81a Valve seat 82 Valve body 83 Spool 84 Spring 90 Control device 91 Operation mode selection SW
165b, 165c Heating valve outlet piping 168b, 168c Heating valve inlet piping

Claims (1)

A vending machine that has a product storage for cooling and heating, and selectively cools or heats the product storage by an operation mode of cooling and heating,
A compressor for compressing the refrigerant, a condenser for condensing the refrigerant via a condenser solenoid valve, an expansion means for expanding the refrigerant, a distributor for distributing the refrigerant expanded by the expansion means, and the interior A plurality of internal heat exchangers that evaporate the refrigerant from the distributor via the cooler inlet electromagnetic valve and the check valve, and a merger that merges the evaporated refrigerant via the cooler outlet electromagnetic valve, And configure the cooling circuit,
A pipe connection is made between the compressor and the internal heat exchanger inlet side to the cooling circuit via a heater solenoid valve, and between the internal heat exchanger outlet side and the distributor. By connecting the pipe through the second expansion means, the heating / cooling circuit for operating the heat pump by operating the internal heat exchanger as a condenser is configured,
In a vending machine having a control device for controlling the compressor, the condenser solenoid valve, the cooler inlet solenoid valve, the cooler outlet solenoid valve, and the heater solenoid valve,
The control device opens the heater solenoid valve connected to the internal heat exchanger and performs internal heat exchange when the internal heat exchanger acts as a condenser to perform a heat pump operation. Vending machine characterized by opening and operating the cooler inlet solenoid valve connected to the vessel.

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