JP2011113431A - Automatic dispenser - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic dispenser which can suppress abnormal noise from an electromagnetic valve and which can realize operation of a compressor at low cost and with high reliability. <P>SOLUTION: In the automatic dispenser in which a cooling circulation circuit is configured with the compressor, a capacitor, a first swelling section, a distributor, an evaporator which is divided from the distributor through a first cooler entry electromagnetic valve, and an inside heat exchanger which is divided from the distributor through a second cooler entry electromagnetic valve, and a heating and cooling circulation circuit that performs heat pump operation to make the inside heat exchanger act as the capacitor is configured by connecting it to the inside heat exchanger from the compressor, a direct operated electromagnetic valve is used as the second cooler entry electromagnetic valve, while a connection pipe portion that is open to an electromagnetic valve body portion is connected to an entry side of the inside heat exchanger, and the connection pipe portion sealed in the electromagnetic valve body portion with a valve is connected to an exit side of a shunt. By providing a bypass conduit through a resistor in parallel with the first cooler entry electromagnetic valve, abnormal noise generated by the second cooler entry electromagnetic valve is prevented. <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, for heating in the cabinet has been attracting attention (for example, see Patent Document 1).

  The vending machine disclosed in Patent Document 1 has a heat exchanger for cooling and heating in a storage that also serves as cooling and heating, and expansion that expands the refrigerant for each evaporator in each storage Since the vessel was provided, there was a problem that the cost increased.

  Therefore, in order to reduce the cost, as shown in FIG. 8, one storage / heater combined with one cooling / heating is provided in one storage / heater as shown in FIG. We have developed a vending machine that reduces costs by providing only two units for cooling and heating only, not for each unit.

  The cooling / heating unit 60 as the refrigerant circuit shown in FIG. 8 includes a cooling circulation circuit 60A that only cools the inside of the warehouse and a heating / cooling circulation circuit 60B that simultaneously performs cooling and heating inside the warehouse (performs heat pump operation). ing. In addition, the enclosure of the dotted line in a figure has shown typically the goods storage 40a only for cooling, and the goods storage 40b, 40c used also for cooling and heating.

    The cooling circuit 60A is connected to the flow divider 64 via the compressor 61, the condenser solenoid valve 68, the condenser 62, and the first expander 63, one of the flow dividers 64 being the first cooler inlet. The electromagnetic valve 70a is connected to the collector 67 via the evaporator 65a, and the other of the flow divider 64 is connected to the collector via the second cooler inlet electromagnetic valves 70b and 70c and the internal heat exchangers 65b and 65c. 67 is a circuit that returns to the compressor 61 from the collector 67 via the accumulator 69.

  On the other hand, in addition to the cooling circuit 60A, the heating / cooling circuit 60B is connected in parallel with the condenser solenoid valve 68 from the compressor 61 and is connected to the condenser solenoid valve 68 via the heater solenoid valves 68b and 68c. 70b and 70c are connected to intermediate points (connection points) 168b and 168c between the interior heat exchangers 65b and 65c, respectively, and check valves 71 and 71 are respectively connected from the exit sides of the interior heat exchangers 65b and 65c. Are connected to the distributor 64 via the auxiliary heat exchanger 76 and the second expander 79.

  That is, 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 the check valves 71, 71 are connected to the internal heat exchangers 65c, 65b. To the distributor 64 via the auxiliary heat exchanger 76 and the expander 79, and to the evaporator 65 a via the first cooler inlet solenoid valve 70 a from the flow divider 64, the collector 67, and the accumulator 69 is a circuit that returns to the compressor 61 via 69.

  As the second cooler inlet electromagnetic valves 70b and 70c, a normal low-cost direct acting electromagnetic valve 80 as shown in FIG. 9 is used. As shown in the figure, the direct acting solenoid valve 80 has a cylindrical body inside 81a in the solenoid valve body 81, a first connecting pipe portion 81b on the side surface side of the body inside 81a, and a second side on the bottom surface side. The connecting pipe portion 81c is connected, and a valve seat 81d is formed in a truncated cone shape on the peripheral edge of the upper surface of the second connecting pipe portion 81c. A spherical valve body 82 that comes into contact with the valve seat 81d 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 into the main body inside 81a. 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 not energized, the valve body 82 is brought into contact with the valve seat 81d by the gravity of the spring 84 and the spool 83 as shown in FIG. The communication of the second connecting pipe portion 81c is sealed. Specifically, the first connecting pipe portion 81 b and the main body inside 81 a communicate with each other, and the second connecting pipe portion 81 c is closed with the main body inside 81 a by the valve body 82. When the solenoid 86 is energized, as shown in FIG. 9B, the armature 85 is attracted and moved upward by the magnetic force of the solenoid 86, so that a gap is formed between the valve body 82 and the valve seat 81d. The first connecting pipe portion 81b and the second connecting pipe portion 81c communicate with each other, and the refrigerant can pass therethrough.

  The first connection pipe portions 81b and 81b of the second cooler inlet solenoid valves 70b and 70c are connected to the connection points 168b and 168c, and the second connection pipe portions 81c and 81c are connected to the shunt 64 side. ing. By adopting this connection configuration, it is not necessary to provide a check valve between the second cooler inlet electromagnetic valves 70b and 70c and the connection points 168b and 168c, thereby reducing the cost.

  When the product storage 40a, 40b, 40c is set to the operation mode in which the cooling operation is performed in such a configuration, the condenser solenoid valve 68, the first cooler inlet solenoid valve 70a, the second cooler inlet solenoid valve 70b, 70c, The cooler outlet solenoid valves 72b and 72c are opened, and the heater solenoid valves 68b and 68c are closed. At this time, as shown by the thick line in FIG. 8, the high-temperature refrigerant compressed by the compressor 61 is condensed by the condenser 62 to become a liquid, and expands by the first expander 63 to become a low-temperature gas-liquid two-phase flow. After being divided in three directions by the flow divider 64, it flows into the evaporator 65a and the internal heat exchangers 65b and 65c. The refrigerant that has flowed in is evaporated by the evaporator 65a and the internal heat exchangers 65b and 65c to cool the product storages 40a, 40b, and 40c, and the evaporated refrigerant is collected by 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 operation, the internal temperature from the internal temperature sensors Ta, Tb, Tc is detected, and the internal temperature is maintained at an appropriate temperature by the thermocycle operation.

66b and 66c are installed in front of the internal heat exchangers 65b and 65c,
It is a heater which assists heating of the product storages 40b and 40c.

JP 2005-227833 A

  However, when this type of vending machine stops the operation in the cooling operation mode, that is, when the compressor 61 is stopped and the second cooler inlet solenoid valves 70b and 70c are closed, the second cooling is performed. Excessive pressure is applied to both ends of the vessel inlet solenoid valves 70b and 70c. At this time, the pressure from the second connection part 81c of the second cooler inlet electromagnetic valves 70b and 70c is pushed up in the same manner as in FIG. 9B, and a gap is formed between the valve seat 81d and the valve seat 81d. Is done. When the gap is formed, the outlet side and the inlet side communicate with each other, and when the refrigerant flows, the pressure between the inlet and outlet of the solenoid valve becomes almost the same pressure. Therefore, the valve body 82 comes into contact with the valve seat 81 again to close the passage. . Then, the vibration of pushing up and pushing back the valve body 82 again by the pressure from the second connection portion 81c is repeated. This phenomenon continues until the pressure difference between the second connection portion 81c and the first connection portion 81b becomes small, and an harsh sound (hereinafter referred to as an abnormal sound) generated when the valve body 82 collides with the valve seat 81. There was a concern that it would continue to generate sound. In order to prevent this, it is conceivable to use a large solenoid valve that is resistant to back pressure, but this leads to an increase in cost.

  A similar phenomenon occurs when the product storage 40a reaches an appropriate temperature, the product storage 40a is stopped, and the product storages 40b and 40c are cooled. There was a possibility of the occurrence of. In addition, when the product storage cases 40a and 40b are cooled and the product storage case 40c is heated, there is a possibility that abnormal noise may occur in the second cooler inlet electromagnetic valve 70b, and the product storage cases 40a and 40c are cooled. Even when the product storage case 40b is heated, there is a possibility that abnormal noise may be generated in the second cooler inlet electromagnetic valve 70c.

  In view of the above circumstances, the present invention provides a vending machine that solves the above-described problems, suppresses noise generated from the electromagnetic valve, and can operate a compressor at low cost and high reliability. Objective.

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 to cooling and a product storage combined with cooling and heating, and is selected according to an operation mode of cooling and heating. A vending machine that cools or heats the product storage, and compresses the refrigerant, the condenser that condenses the refrigerant, the first expansion means that expands the refrigerant, and distributes the expanded refrigerant A distributor, one of the distributors evaporates the refrigerant via a first cooler inlet solenoid valve, an evaporator provided in a product storage dedicated for cooling, and the other of the distributors is a second cooler From the internal heat exchanger provided in the product storage for cooling and heating that evaporates the refrigerant via the inlet electromagnetic valve, the refrigerant flowing from the internal heat exchanger via the cooler outlet electromagnetic valve, and the evaporator Cooling circulation with an aggregator that merges the flowing refrigerant And a pipe connected between the compressor heat exchanger inlet side and the second cooler inlet solenoid valve from the compressor via a heater solenoid valve. In addition, by connecting a pipe between the outlet side of the internal heat exchanger and the distributor via a second expansion means, the internal heat exchanger acts as a condenser to perform a heat pump operation. A cooling circulation circuit is configured, and the second cooler inlet solenoid valve is constituted by a direct acting solenoid valve, and when there is no energization, a first connection pipe portion opened inside the solenoid valve body, and a solenoid valve body A second connecting pipe portion sealed by a valve, the first connecting pipe portion is connected to an inlet side of the internal heat exchanger, and the second connecting pipe portion is Resistor in parallel with the first cooler inlet solenoid valve in the vending machine connected to the outlet side of the shunt A bypass line is provided through a vessel.

  The vending machine according to claim 1 of the present invention is characterized in that the second cooler inlet solenoid valve is constituted by a direct acting solenoid valve, and is opened to the inside of the solenoid valve body when not energized, A second connecting pipe part sealed with a valve inside the solenoid valve body, and the first connecting pipe part is connected to the inlet side of the internal heat exchanger, and the second connecting pipe Part is connected to the outlet side of the shunt, and a bypass line is provided through a resistor in parallel with the first cooler inlet solenoid valve, so that the refrigerant in the circuit when the compressor is stopped is Since it flows out from a bypass line, the pressure difference which generate | occur | produces between 2nd cooler inlet solenoid valves can be reduced, and generation | occurrence | production of the noise of a 2nd cooler inlet solenoid valve 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. The refrigerant circuit figure which concerns on the Example of this invention. 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 pressure in piping is shown, (a) is a pressure chart figure in the refrigerant circuit which concerns on a prior art example, (b) is a pressure chart figure at the time of the driving | operation in FIG. 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 concerning a prior art example. It is sectional drawing which shows the structure of a direct acting type solenoid valve, (a) is sectional drawing at the time of no energization of a solenoid, (b) is sectional drawing at the time of energization of a solenoid.

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.
In the perspective view of FIG. 1, the cross-sectional view of FIG. 2, and the refrigerant circuit diagram of FIG. 3, the vending machine includes a main body cabinet 10 formed as a rectangular heat insulator having an open front surface, and an exterior provided on the front surface thereof. The door 20 and the inner door 30 and the inside of the main body cabinet 10 are partitioned and formed 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 40w, three independent product storage boxes 40a and 40b, 40 c, a machine room 50 for storing the cooling / heating unit 60 for cooling or heating the product storage units 40 a, 40 b, and 40 c at the lower part, and the inside of the outer door 20, and in the product storage units 40 a, 40 b, 40 c And a control means 90 for controlling cooling, heating operation, etc. of the vending machine by the internal temperature sensors Ta, Tb, Tc.

  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. In addition, an intake / exhaust port 22 is arranged in the lower part.

  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 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 40a is exclusively used for cooling, and the product storages 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 out the discharged product S to the product take-out port 21 of the outer door via 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. It has the evaporator 65a and the internal heat exchangers 65b and 65c in the store, and each device is connected by refrigerant 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 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 first 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 evaporator 65a and the internal heat exchangers 65b and 65c.

  The evaporator 65a is for cooling the product storage 40a, and the internal heat exchangers 65b and 65c are for cooling or heating the product storage 40b and 40c. Further, the evaporator 65a and the internal heat exchangers 65b and 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. It has been installed. As for cooling and heating in the product storage, the air cooled or heated by the evaporator 65a and the internal heat exchangers 65b and 65c is blown to the product S in the product storage, as shown by the arrows in FIG. It is performed by circulating and collecting from the duct 67d.

  The accumulator 69 is a sealed container for allowing the refrigerant evaporated from the evaporator 65a and the internal heat exchangers 65b and 65c to flow in, separating the gas and liquid, storing the liquid refrigerant, and returning the gaseous 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.
The second 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 chamber 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 temperature in 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 first cooler inlet solenoid valve 70a and the second cooler inlet solenoid valves 70b and 70c open and close the expanded refrigerant passage between the flow divider 64 and the evaporator 65a and the internal heat exchangers 65b and 65c. The cooler outlet solenoid valves 72b and 72c open and close 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 bypass conduit 77 is connected in parallel with the first cooling inlet electromagnetic valve 70a. Specifically, the first cooling inlet electromagnetic valve 70a and the evaporator 65a are interposed between the first expander 63 and the flow divider 64. It is the piping which connects between.

The resistor 78 is connected to the middle of the bypass pipeline 77 and depressurizes the refrigerant flowing from the first expander 63. Specifically, the resistor 78 is a capillary and may be an expansion valve.
The refrigerant circuit configuration of the cooling / heating unit 60 will be described in detail with reference to FIG. The refrigerant circuit includes a cooling circulation circuit 60A that only cools the inside of the warehouse and a heating and cooling circulation circuit 60B that simultaneously performs cooling and heating inside the warehouse (performs a heat pump operation). In addition, the enclosure of the dotted line in a figure has shown typically the goods storage 40a only for cooling, and the goods storage 40b, 40c used also for cooling and heating.

  The cooling circuit 60A is connected to the flow divider 64 via the compressor 61, the condenser solenoid valve 68, the condenser 62, and the first expander 63, one of the flow dividers 64 being the first cooler inlet. The electromagnetic valve 70a is connected to the collector 67 via the evaporator 65a, and the other of the flow divider 64 is connected to the collector via the second cooler inlet electromagnetic valves 70b and 70c and the internal heat exchangers 65b and 65c. 67 is a circuit that returns to the compressor 61 from the collector 67 via the accumulator 69. In addition, a bypass line 77 is provided via a resistor 78 in parallel with the first cooler inlet electromagnetic valve 70a.

  On the other hand, in addition to the cooling circuit 60A, the heating / cooling circuit 60B is connected in parallel with the condenser solenoid valve 68 from the compressor 61 and is connected to the condenser solenoid valve 68 via the heater solenoid valves 68b and 68c. 70b and 70c are connected to intermediate points (connection points) 168b and 168c between the interior heat exchangers 65b and 65c, respectively, and check valves 71 and 71 are respectively connected from the exit sides of the interior heat exchangers 65b and 65c. And a distribution path that connects to the distributor 64 via the auxiliary heat exchanger 76 and the second expander 79 is provided.

  The first connection pipe portions 81b and 81b (see FIG. 9) of the second cooler inlet solenoid valves 70b and 70c are connected to the connection points 168b and 168c, and the second connection pipe portions 81c and 81c (FIG. 9) are connected. Is connected to the shunt 64 side.

  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 second expander 79, and are connected to the evaporator 65a via the first cooler inlet solenoid valve 70a from the flow divider 64. This is a circuit that returns to the compressor 61 via the unit 67 and the accumulator 69.

  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 compressor operation of the refrigerant circuit and opening / closing of the solenoid valve 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 right product storage is heated, it is described as CCH mode. Further, the control means 90 includes a compressor 61, a condenser solenoid valve 68, a first cooler inlet solenoid valve 70a, and a second cooler inlet solenoid valve depending on the temperatures detected by the internal temperature sensors Ta, Tb, and Tc. 70b, 70c, cooler outlet solenoid valves 72b, 72c, heater solenoid valves 68b, 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. .

  When the operation mode is set to the CCC mode by operating the operation mode setting SW 91 in such a configuration, the control unit 90 causes the condenser solenoid valve 68, the first cooler inlet solenoid valve 70a, and the second cooler inlet solenoid valves 70b, 70c. The cooler outlet solenoid valves 72b and 72c are opened, and 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 evaporator 65a and the internal heat exchangers 65b and 65c. The refrigerant that flows in evaporates in the evaporator 65a and the internal heat exchangers 65b and 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. Although the refrigerant also flows through the bypass pipe 77, since the resistance of the resistor 78 is much larger than the resistance when the first cooling inlet solenoid valve 70a is opened, it does not flow so as to affect the cooling performance. . In this cooling, the control unit 90 controls the internal temperature to an appropriate temperature by the thermocycle operation by the internal temperature sensors Ta, Tb, Tc.

  When the inside temperature reaches an appropriate temperature, the compressor 61 is stopped and all the solenoid valves are closed. At this time, since it flows from the bypass line 77 to the evaporator 65a via the resistor 78, the rise in pressure at both ends of the second cooling inlet electromagnetic valves 70b and 70c is suppressed. As a result, the second cooling inlet electromagnetic valve Generation of abnormal noise due to 70b and 70c can be prevented.

  The pressure measurement results at each piping location are shown in the time chart of FIG. 6 by comparing the effects of the presence or absence of the bypass pipeline 77 with the test results conducted by the inventors on this pressure situation. The pressure is measured at the pressure point P1 between the second cooling inlet electromagnetic valve 70c and the internal heat exchanger 65c, the pressure point P2 between the first expander 63 and the flow divider 64, the first This is a pressure point P3 between the cooling inlet electromagnetic valve 70a and the evaporator 65a. In FIG. 6A, which is a pressure chart diagram in the refrigerant circuit according to the conventional example, the pressure difference (P2-P1) at both ends of the second cooling inlet electromagnetic valve 70c is large for several minutes after the compressor 61 is stopped. An abnormal noise was generated. On the other hand, in FIG. 6B, which is a pressure chart diagram of the first embodiment in the case where the bypass line 77 via the resistor 78 is provided, all of P1, P2, and P3 rise after the compressor 61 is stopped. The pressure difference (P2−P1) between both ends of the cooling inlet electromagnetic valve 70c of the second cooling valve became small, and no abnormal noise occurred.

  Next, when the product storage units 40a and 40b are cooled and the product storage unit 40c is set to a heating mode, the control means of the vending machine includes the heater solenoid valve 68c, the first cooler inlet solenoid valve 70a, the first The second condenser inlet solenoid valve 70b and the condenser outlet solenoid valve 72b are opened, and the condenser solenoid valve 68, the heater solenoid valve 68b, the second condenser inlet solenoid valve 70c, and the condenser outlet solenoid valve 72c are closed. . At this time, the high-temperature refrigerant compressed by the compressor 61 flows into the internal heat exchanger 65c via the heater electromagnetic valve 68c and the connection point 168c as shown by the thick line in FIG. The refrigerant flowing into the internal heat exchanger 65c condenses and heats the product storage 40c, further condenses in the auxiliary heat exchanger 76 via the check valve 71, and flows into the second expander 79. The refrigerant flowing into the second expander 79 expands into a low-temperature and low-pressure gas-liquid two-phase flow, passes through the flow divider 64, the first cooler inlet solenoid valve 70a, and the second cooler inlet solenoid valve 70b. Flow into the evaporator 65a and the internal heat exchanger 65b. The refrigerant that has flowed into the evaporator 65a and the internal heat exchanger 65b evaporates, cools the product storage 40a and the internal heat exchanger 65b, and returns to the compressor 61 via the collector 67 and the accumulator 69. Although the refrigerant also flows through the bypass pipe 77, since the resistance of the resistor 78 is much larger than the resistance when the first cooling inlet solenoid valve 70a is opened, it does not flow so as to affect the cooling performance. . In this heat pump operation, the interior temperature from the interior temperature sensors Ta, Tb, Tc is detected, and the interior is maintained at an appropriate temperature by the thermocycle operation.

  When the inside temperature reaches an appropriate temperature, the compressor 61 is stopped and all the solenoid valves are closed. At this time, since it flows from the bypass line 77 to the evaporator 65a via the resistor 78, a rise in pressure at both ends of the second cooling inlet electromagnetic valve 70b is suppressed, and as a result, the second cooling inlet electromagnetic valve 70b Generation of abnormal noise can be prevented. Note that the pressures at both ends of the second cooling inlet solenoid valve 70c are both held on the high pressure side, so that the pressure difference is small and there is no possibility of abnormal noise.

  In the above description, the cooling heating operation mode has been described as the CCC mode and the CCH mode. However, the product storage to be heated is at an appropriate temperature, the product storage to be heated is stopped, and the CC-mode in which the two rooms are cooled is operated. Alternatively, the same effect can be obtained in the CHC mode in which the middle product storage is heated. In the above description, the vending machine dedicated to cooling and heating is used for the two-chamber product storage, but the same effect can be obtained by using a vending machine dedicated to cooling and heating the single-product storage. 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.

DESCRIPTION OF SYMBOLS 10 Main body cabinet 20 Outer door 30 Inner door 40a, 40b, 40c Product storage 60 Cooling / heating unit 61 Compressor 62 Condenser 63 First expander 64 Shunt 65a Evaporator 65b, 65c Inner heat exchanger 68 Condensation Solenoid valve 68a, 68b Heater solenoid valve 70a First cooler inlet solenoid valve 70b, 70c Second cooler inlet solenoid valve 72b, 72c Cooler outlet solenoid valve 77 Bypass line 78 Resistor 79 Second expansion 80 Direct-acting solenoid valve 81a Inside of the main body 81b First connecting pipe part 81c Second connecting pipe part 82 Valve body 83 Spool 84 Spring 90 Control means 91 Operation mode selection SW
168b, 168c connection point

Claims (1)

A vending machine having at least one product storage dedicated to cooling and a product storage combined with cooling and heating, and selectively cooling or heating the product storage according to an operation mode of cooling and heating,
A compressor that compresses the refrigerant, a condenser that condenses the refrigerant, a first expansion means that expands the refrigerant, a distributor that distributes the expanded refrigerant, and one of the distributors is the first cooler inlet electromagnetic An evaporator provided in a product storage dedicated to cooling that evaporates the refrigerant through a valve, and a product storage for cooling and heating that evaporates the refrigerant through the second cooler inlet electromagnetic valve on the other side of the distributor. A cooling circulation circuit is configured by the internal heat exchanger provided in the storage, and the collector that combines the refrigerant flowing from the internal heat exchanger via the cooler outlet solenoid valve and the refrigerant flowing from the evaporator And
Connected to the cooling circuit from the compressor between the inlet side of the internal heat exchanger and the second electromagnetic inlet solenoid valve through a heater electromagnetic valve, and the internal heat By connecting a pipe between the outlet side of the exchanger and the distributor via a second expansion means, a heating / cooling circulation circuit is configured to perform the heat pump operation by causing the internal heat exchanger to act as a condenser. ,
The second cooler inlet solenoid valve is constituted by a direct acting solenoid valve, and is sealed with a first connecting pipe portion opened inside the solenoid valve body when no power is supplied, and a valve inside the solenoid valve body. And the second connecting pipe portion is connected to the inlet side of the internal heat exchanger, and the second connecting pipe portion is connected to the outlet side of the flow divider. In the connected vending machine, a bypass pipe is provided via a resistor in parallel with the first cooler inlet solenoid valve.

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