JP5157418B2 - vending machine - Google Patents

Description

  The present invention relates to a vending machine having a cooling and heating system that simultaneously heats waste water generated by cooling in a vending machine that heats or cools and sells products such as canned beverages. is there.

  In recent years, there has been an increasing demand for power consumption reduction for vending machines, and as a means for reducing power consumption, one that heats a storage room where products are stored using waste heat generated by cooling has been proposed. (For example, refer to Patent Document 1).

  Hereinafter, a conventional vending machine will be described with reference to the drawings.

  FIG. 6 is a refrigerant circuit diagram of a conventional vending machine.

  In the figure, a first storage 201 dedicated to cooling provided with a first heat exchanger 200 and a second heat exchanger 202 provided with a second heat exchanger 202 and used for switching between cooling and heating are used. A storage 203 is provided. A cooling circuit 210 that can supply the refrigerant discharged from the compressor 204 to the heat exchangers 200 and 202 via the condenser 205 and the capillary tubes 206 and 207, and the refrigerant discharged from the compressor 204 to the second heat Whether the refrigerant discharged from the compression 204 flows to the cooling dedicated circuit 210 is constituted by the cooling / heating circuit 212 that can be supplied to the first heat exchanger 200 via the exchanger 202 and the capillary tube 206. , Control whether to flow to the cooling / heating circuit 212.

Accordingly, it is possible to effectively utilize the amount of heat of the high-temperature and high-pressure refrigerant that has conventionally been discarded by the condenser, contribute to heating, and save energy.
Japanese Patent Laid-Open No. 5-118698

  However, in the above-described conventional configuration, when the volume of the storage to be heated is small with respect to the entire storage chamber, the internal volume of the second heat exchanger 202 is extremely small compared to the condenser 205, and the storage The amount of refrigerant becomes excessive when heating is performed. As a result, an abnormal rise in the condensation temperature or an inflow of excessive liquid refrigerant into the compressor 204 occurs, and the durability of the compressor 204 is reduced. Therefore, there is a demand for a mechanism that adjusts the necessary amount of circulating refrigerant in accordance with the internal volume of the condenser when the storage is heated.

  An object of the present invention is to solve the conventional problem, and to provide a vending machine that adjusts the amount of circulating refrigerant necessary for heating a storage to prevent deterioration in the durability of the compressor. To do.

  Further, in the above-described conventional configuration, when the storage room is warmed using the condenser while simultaneously cooling the storage room having the evaporator having a small volume with respect to the entire storage room, the storage room is installed in the storage room. In order to secure a heat exchange amount necessary for heating with an evaporator having a small capacity, it is necessary to significantly lower the evaporation temperature. As a result, an abnormal increase in the discharge gas temperature occurs with an increase in the compression ratio, and the durability of the compressor decreases. Therefore, a mechanism and a control method for stably operating the compressor while ensuring the heating capability are desired.

  The present invention solves the conventional problem, and provides a vending machine that suppresses a decrease in evaporation temperature when a hot / cold switching chamber is heated and prevents a decrease in the durability of the compressor. Objective.

  In order to solve the above-described conventional problems, the vending machine according to the present invention adjusts the amount of circulating refrigerant required when the storage is warmed by the amount of heat released from the indoor heat exchanger, and the excess refrigerant is heated to the outdoor heat. It is stored in the exchanger.

  As a result, when the hot / cold switching chamber having a small volume is heated, an excessive amount of refrigerant is avoided to prevent a decrease in the durability of the compressor.

  In order to solve the above-described conventional problems, the vending machine of the present invention cools a plurality of storage rooms at the same time when the hot / cold switching room is heated.

  As a result, when the hot / cold switching chamber is heated, the heating capacity is secured and the lowering of the evaporation temperature is suppressed to prevent the compressor from being lowered in durability.

  The vending machine according to the present invention stores excess refrigerant in the outdoor heat exchanger, thereby avoiding excessive refrigerant amount when heating a hot / cold switching chamber with a small internal volume and preventing deterioration of the durability of the compressor. In addition, the heating capability can be ensured regardless of the size of the storage chamber, and the product can be heated at an appropriate temperature.

  The invention according to claim 1 has a plurality of product storage rooms, and includes a cold dedicated room and a hot / cold switching room as the product storage room, the evaporator for cooling the room in the cold dedicated room, A switching chamber evaporator for cooling the room and a switching chamber heat exchanger for heating the room are arranged in the cold switching chamber, and the evaporator, the switching chamber evaporator, and the switching chamber heat exchanger outside the product storage chamber, A vending machine having a compressor and an outdoor heat exchanger connected thereto, and when cooling the hot / cold switching chamber, the refrigerant discharged from the compressor passes through the outdoor heat exchanger and the When the hot / cold switching chamber is heated to be supplied to the switching chamber evaporator and the evaporator, the refrigerant discharged from the compressor passes through the switching chamber heat exchanger and is then supplied to the evaporator. Refrigerant to be When the heating temperature of the hot / cold switching chamber is equal to or higher than a predetermined temperature, the refrigerant flow path is configured to flow the refrigerant directly from the compressor to the outdoor heat exchanger. When the hot / cold switching room with a small internal volume is heated by the switching room heat exchanger by storing it in the outdoor heat exchanger, it prevents product abnormalities by preventing an abnormal increase in the heat radiation temperature due to excessive refrigerant amount. It is possible to prevent overheating and further prevent a decrease in the durability of the compressor.

  According to a second aspect of the present invention, in the first aspect of the present invention, the refrigerant flow path connected to the evaporator is branched to the outlet side of the outdoor heat exchanger and directly connected to the suction pipe of the compressor. Since it has a reflux pipe, the amount of excess refrigerant stored in the outdoor heat exchanger can be adjusted so that the product is maintained at the set temperature, and when the hot / cold switching chamber with a small volume is heated, It can prevent abnormal increase in heat dissipation temperature due to excessive amount and prevent deterioration of compressor durability, and the amount of circulating refrigerant is insufficient due to fluctuations in outside air temperature and load, etc., and a predetermined heat dissipation temperature can be obtained. Therefore, the required amount of circulating refrigerant can be adjusted without causing a decrease in efficiency.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein three or more product storage rooms are provided side by side across the partition wall, and a switching chamber heat exchanger of the hot / cold switching chamber. When the refrigerant is allowed to flow and heated, at least two or more other product storage chambers are set to be cooled and the compressor is operated by flowing the refrigerant through a plurality of evaporators, so that a high evaporation temperature is maintained. The amount of heat exchange required for heating can be ensured, and an increase in the compression ratio can be suppressed to prevent a decrease in the durability of the compressor.

  Since the invention according to claim 4 is a vending machine connecting a plurality of evaporators in series according to the invention according to claim 3, the amount of heat exchange required for heating is maintained while maintaining a high evaporation temperature. It can be ensured, the rise in the compression ratio can be suppressed and the compressor durability can be prevented from being lowered, and the load ratio of the evaporator connected in series can be changed to cause the specific evaporator to be insufficient in capacity. Even if it becomes automatically, the other evaporators can compensate automatically, and a stable heating capability can always be obtained.

  According to a fifth aspect of the present invention, in the invention according to the fourth aspect, when the refrigerant is supplied to the switching chamber heat exchanger of the hot / cold switching chamber and heated, the commodity storage adjacent to the hot / cold switching chamber is stored. Adjacent storage chambers are prone to load due to heat transfer from the hot / cold switching chamber, which is always heated regardless of changes in the outside air temperature, because the evaporators placed in the room are connected in series so that they are upstream. Therefore, the evaporator can efficiently recover the exhaust heat and can always obtain a stable heating capability.

  Since the invention according to claim 6 is a vending machine that preferentially cools the storage room of the cooling setting in which the evaporator is installed on the upstream side in the invention according to claim 4 or 5, the downstream side The storage room with the evaporator is not overcooled.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the same reference numerals are given to the same components as those of the conventional example, and detailed description thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram showing an internal configuration viewed from the front of a main body of a vending machine according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. FIG. 4 is a schematic diagram of the hot / cold switching chamber of the vending machine according to the embodiment, and FIG. 5 is a timing showing the operation of the compressor and the heating heater of the vending machine according to the embodiment. It is a chart.

  1 and 2, a vending machine 100 is for cooling or heating and selling canned beverage products, and a main body 101 composed of a heat insulating box having an open front surface, and one side of the main body 101 can be pivoted. A supported openable / closable outer door 102 is configured. A sales outlet 103 is disposed at the lower part of the outer door 102.

  Behind the outer door 102, a front opening is closed by a heat-insulating door 104 that can be freely opened and closed, and a product storage box 105 is formed in the main body 101. As shown in FIG. 1, the product storage box 105 is divided into left and right three chambers by partition walls 106 and 107 filled with a vacuum heat insulating material. Cooling and heating are provided on the right side of the partition wall 107. A first product storage chamber 1 (also referred to as a hot / cold switching chamber 1) that can be selected and switched is formed, and cooling and heating are provided in the central portion located between the partition wall 106 and the partition wall 107. A second product storage chamber 2 (also referred to as hot / cold switching chamber 2) that can be selected and switched is formed, and a third product storage chamber 3 (also referred to as a cold dedicated chamber 3) is formed on the left side of the partition wall 106. ) Is formed.

  In each of the storage chambers 1, 2, and 3, storage shelves 108 for storing products in a vertical position in a lying position are suspended above the product storage 105 and the products are stored inside. . A carry-out device 109 for carrying out the selected merchandise is disposed below the storage shelf 108, and the merchandise is dropped downward one by one. A chute 110 inclined toward the sales outlet 103 is arranged below the carry-out device 109, and the product discharged from each storage shelf 108 falls on the chute 110 and rolls to the sales outlet 103. It will be guided.

  Below the chute 110, a first cooling greenhouse 111, a second cooling greenhouse 112, and a cooling exclusive chamber 113 are provided corresponding to the product storage rooms 1, 2, and 3, respectively. A first evaporator 4 (also referred to as a switching chamber evaporator) for flowing a refrigerant when cooling the first commodity storage chamber 1 in the first cooling greenhouse 111 and a first indoor heat for flowing the refrigerant when warming. An exchanger 20 (or a switching chamber heat exchanger 20) is provided.

  Further, as shown in FIG. 2, the inside of the first cooling greenhouse 111 is provided with an indoor fan 27 that forcibly blows air cooled during cooling or air heated during heating to the storage shelf 108, and is low during heating. There is provided a heating heater (electric heater) 34 that is energized at the time of the outside temperature or in a transitional state where the load until the heating is stabilized at the set heating temperature is large.

  As shown in FIG. 2, the first evaporator 4 and the first indoor heat exchanger 20 are arranged on the suction side with respect to the indoor fan 27, and the heating heater 34 is arranged on the discharge side. The first evaporator 4 and the first indoor heat exchanger 20 are both constituted by fin tube heat exchangers, and can be cascade-heat exchanged via the fins, arranged side by side in the depth direction of the vending machine main body 101. Has been.

  In the case of the embodiment, the distance from the heating heater 34 to the first indoor heat exchanger 20 is increased so that the first indoor heat exchanger 20 is not affected by the heat effect of the heating heater 34. The first indoor heat exchanger 20, the first evaporator 4, the indoor fan 27, and the heating heater 34 are arranged in a substantially linear order from the discharge side to the discharge side.

  The second cooling greenhouse 112 is provided with a heating heater (electric heater) 26 that is energized during heating when the second evaporator 5 and the second product storage chamber 2 are heated. A third evaporator 6 is provided in the cooling exclusive chamber 113. Similarly to the product storage room 1, each room 2 and 3 has an internal fan 27, forcibly ventilating the inside of the storage to force circulation of the storage shelves 108 of the respective rooms 1, 2 and 3. The inside of the warehouse is controlled to an appropriate temperature by the inside sensor 119 provided below. In addition, an outside air temperature sensor 120 is provided in front of the machine room 117 below the inside of the outer door 102.

  A machine room 117 defined by a partition wall 116 provided at the lower part of the commodity storage 105 is formed below the main body 101.

  Next, the configuration inside the machine room 117 will be described.

  As shown in FIGS. 1 and 2, the vending machine according to the present embodiment includes evaporators 4, 5 and 6 provided in each product storage room, and a first indoor heat exchanger provided in the product storage room 1. 20, the expansion mechanisms 9, 10, 11 of the evaporators 4, 5, 6, the compressor 8 disposed in the machine room 117, and the outdoor heat exchanger 7 form a cooling and heating cycle connected by piping. ing. In addition, a first cooling fan 30 and a second cooling fan 31 that are external fans are arranged side by side behind the outdoor heat exchanger 7 disposed on the front side of the machine room 117, and the first cooling fan 30 and the second cooling fan 30 are arranged side by side. The cooling fan 31 sucks the air radiated by the outdoor heat exchanger 7 and discharges it to the compressor 8 to prevent the compressor 8 from becoming high temperature, thereby ensuring reliability, or the first evaporator 4. Evaporation of the defrost water is promoted by discharging it to the evaporating dish 59 for storing the defrost water of the second evaporator 5 and the third evaporator 6.

  Moreover, the 1st cooling fan 30 and the 2nd cooling fan 31 are DC fans which employ | adopted the DC motor which can change rotation speed with an applied voltage.

  Further, as shown in FIG. 1, the first product storage chamber 1 and the second product storage chamber 2 have a narrower width space than the third product storage chamber, and the first product storage chamber 1 and the second product storage chamber 2 as shown in the figure. Is arranged with a row of storage shelves 108, whereas the third product storage chamber 3 has two rows of storage shelves. Therefore, the first evaporator 4 that cools the first product storage chamber 1 and the second evaporator 5 that cools the second product storage chamber 2 have the internal volume of the third evaporator 6 that cools the third product storage chamber 3. It is about half, and the outside dimension is also about half according to this.

  Therefore, the heat exchange capacity of the first evaporator 4 and the second evaporator 5 is about half that of the third evaporator 6. Similarly, the first indoor heat exchanger 20 accommodated in the first commodity storage chamber 1 has substantially the same internal volume as the first evaporator 4, and the internal volume of the outdoor heat exchanger 7 is the evaporator 4, 5. , 6 has substantially the same internal volume, the first indoor heat exchanger 20 has a smaller outside dimension and internal volume of about 1/4 than the outdoor heat exchanger 7, and the heat exchange capacity is about 1/4. And become smaller.

  The refrigerant circuit configuration will be specifically described with reference to FIG. 3. The first discharge pipe 50 and the second branch are connected so that the pipe discharged from the compressor 8 connects the first indoor heat exchanger 20 and the outdoor heat exchanger 7 in parallel. The first branch heat pipe 20 is branched to the pipe 51, the first indoor heat exchanger 20 is connected to the first branch pipe 50, and the outdoor heat exchanger 7 is connected to the second branch pipe 51.

  Moreover, it has the on-off valves 21 and 22 which switch the flow path of the discharge refrigerant | coolant of the compressor 8, the on-off valve 21 is arrange | positioned at the inlet side of the outdoor heat exchanger 7 of the 2nd branch piping 51, and the on-off valve 22 is 1st. The branch pipe 50 is disposed on the inlet side of the first indoor heat exchanger 20. The on-off valve 24 is arranged in the first connection pipe 52 connected to the outlet side of the first indoor heat exchanger 20, and the on-off valve 23 is arranged in the second connection pipe 53 connected to the outlet side of the outdoor heat exchanger 7. After that, they merge and are connected as one pipe, and open and close in synchronization with the on-off valves 21 and 22.

  Further, as shown in FIG. 3, after the first connection pipe 52 and the second connection pipe 53 merge, the evaporators 4, 5, and 6 are connected in parallel via the expansion mechanisms 9, 10, and 11. The expansion mechanisms 9, 10, and 11 are expansion valves that reduce the pressure of the refrigerant passing therethrough and have a blocking function. The outlet pipe of the evaporator 5 constitutes a serial pipe 33 connected in series to the inlet pipe of the evaporator 6.

  The first indoor heat exchanger 20 has a first reflux pipe 55 branched from the first connection pipe 52 on the outlet side, and is connected to the suction pipe 54 of the compressor 8 which is the outlet pipe of the evaporators 4 and 6. ing. The first return pipe 55 is provided with an opening / closing valve 25 for opening and closing the flow path.

  A second reflux pipe 56 connected to the branch pipe from the second connection pipe 53 is provided on the outlet side of the outdoor heat exchanger 7, and the second reflux pipe 56 is connected to the suction pipe 54 of the compressor 8. The second reflux pipe 56 is provided with a storage amount adjustment valve 57 that controls the opening and closing of the flow path of the second reflux pipe 56 to adjust the amount of refrigerant stored in the outdoor heat exchanger 7. The first indoor heat exchanger 20 is provided with a first indoor heat exchanger temperature sensor 58 that detects the temperature of the first indoor heat exchanger 20. A heating heater 26 is disposed in front of the evaporator 5 in the second product storage chamber 2.

  As the refrigerant, natural but flammable refrigerant isobutane is used.

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

  When cooling the hot / cold switching chamber 1 and the hot / cold switching chamber 2, the on-off valve 21 and on-off valve 23 are opened, the on-off valve 22, on-off valve 24 and the storage amount adjustment valve 57 are closed to drive the compressor 8. To do. As a result, the refrigerant discharged from the compressor 8 is condensed in the outdoor heat exchanger 7, and then decompressed by the expansion valve 9, the expansion valve 10, and the expansion valve 11, respectively, and the first evaporator 4 and the second evaporation. Is supplied to the container 5 and the third evaporator 6 to cool the storage chambers 1, 2, 3. Here, the refrigerant supplied to the second evaporator 5 is supplied to the third evaporator 6 through the serial pipe 33. Then, the refrigerant evaporated in the first evaporator 4, the second evaporator 5, and the third evaporator 6 returns to the compressor 8.

  In addition, although the on-off valve 22 is in a closed state, in reality, it cannot be maintained in a completely closed state, and the refrigerant passes through the on-off valve 22 and is led to the first indoor heat exchanger 20 and stays there. Will do. For this reason, the on-off valve 25 is opened in advance or when a predetermined time has elapsed, and the refrigerant in the first indoor heat exchanger 20 is led to the suction pipe 54 through the first reflux pipe and returned to the compressor 8. As a result, the amount of refrigerant enclosed in the cooling and heating cycle can be optimized, and the amount of useless refrigerant can be reduced. In particular, since the amount of the combustible refrigerant can be reduced, the explosion-proof property can be improved.

  Further, the expansion valve 10 and the expansion valve 11 are always controlled to block one of them. Then, control is performed so that the hot / cold switching chamber 2 is cooled in preference to the cold exclusive chamber 3, and the excess liquid is supplied to the third evaporator 6 while the expansion valve 10 is opened and the refrigerant flows through the second evaporator 5. The refrigerant is supplied to cool the cold dedicated chamber 3 at the same time as the hot / cold switching chamber 2, and when the cold dedicated chamber 3 reaches a predetermined temperature or when the hot / cold switching chamber 2 reaches an appropriate temperature, the expansion valve 11 Is opened, the expansion valve 10 is closed, the refrigerant is passed through the third evaporator 6 and the cold exclusive chamber 3 is cooled alone.

  As a result, when the second evaporator 5 and the third evaporator 6 are cooled in series as compared with the case where the second evaporator 5 having a small heat exchange capacity is cooled alone, a larger evaporation capacity can be secured. Therefore, efficient operation can be performed by setting the evaporation temperature high. The expansion valve 9 can be controlled to open and close independently of the expansion valve 10 and the expansion valve 11, and the hot / cold switching chamber 1 can be cooled individually or simultaneously with other storage chambers.

  Next, when the hot / cold switching chamber 1 is heated and the hot / cold switching chamber 2 is cooled, the on-off valves 21, 23, 25, the expansion valve 9 and the storage amount adjusting valve 57 are closed, The on-off valve 24 is opened to drive the compressor 8. The refrigerant discharged from the compressor 8 radiates heat in the first indoor heat exchanger 20, is then decompressed by the expansion valve 10 and the expansion valve 11, and is supplied to the second evaporator 5 and the third evaporator 6. . Then, the refrigerant evaporated in the second evaporator 5 and the third evaporator 6 is returned to the compressor 8.

  At this time, the cooling of the hot / cold switching chamber 2 and the cold exclusive chamber 3 is performed as control for always closing one of the expansion valve 10 and the expansion valve 11 as in the case of cooling all the chambers. In this case, normally, the expansion valve 10 is opened and the expansion valve 11 is closed, and the refrigerant flows through the third evaporator 6 on the downstream side with the second evaporator 5 as the upstream side. The second evaporator 5 and the third evaporator 6 are connected in series, the refrigerant is flowed through both the evaporators 5 and 6 to recover the exhaust heat, and the first indoor heat exchanger 20 having a smaller internal volume than these is used. The hot / cold switching chamber 1 is heated by dissipating heat.

  As a result, a larger evaporation capacity can be ensured, so that an efficient operation can be performed by setting the evaporation temperature high, and a heat exchange amount necessary for heating can be ensured while maintaining a high evaporation temperature. It is possible to prevent an increase in the compression ratio and prevent a decrease in the durability of the compressor. Further, the second evaporator 5 installed in the hot / cold switching chamber 2 having a large load adjacent to the hot / cold switching chamber 1 which is the heating setting is connected in series with the third evaporator 6 with the upstream side being the upstream side. Since it is cooled, the temperature of the hot / cold switching chamber 2 is likely to rise due to heat transfer from the adjacent hot / cold switching chamber 1, so the second evaporator 5 efficiently recovers the exhaust heat and operates in series connection. By increasing the evaporation rate and setting the evaporation temperature high, more efficient operation can be performed.

  Further, when the outside air temperature decreases and the load on both the hot / cold switching chamber 2 and the cold exclusive chamber 3 becomes small, and the heating capacity for the hot / cold switching chamber 1 cannot be obtained sufficiently, the heating heater 34 is turned on. By operating, the temperature of the hot / cold switching chamber 1 is adjusted.

  At this time, the compressor 8 is operated independently of the operation of the heating heater 34, but the heating heater 34 is installed on the discharge side of the indoor fan 27, and the first indoor heat exchanger 20 is arranged on the suction side. As a result, the first indoor heat exchanger 20 is warmed by radiant heat when the heating heater 34 is in operation and the condensation temperature rises abnormally, or the amount of liquid refrigerant on the outlet side of the first indoor heat exchanger 20 decreases. As a result, it is possible to avoid an abnormal decrease in the evaporation temperature.

  And since the space of the hot / cold switching chamber 1 is small like embodiment, the internal volume of the 1st indoor heat exchanger 20 is also small, and the 2nd goods storage chamber 2 and the 3rd goods storage chamber 3 are cooled. In this case, the internal volume of the first indoor heat exchanger 20 becomes extremely small with respect to the total internal volume of the second evaporator 5 and the third evaporator 6, resulting in an excessive amount of refrigerant and an abnormal heat release temperature. When the temperature detected by the indoor heat exchanger temperature sensor 58 exceeds a predetermined value, the on-off valve 21 is opened for a predetermined time, and a part of the refrigerant discharged from the compressor 8 (surplus refrigerant) is second branched. It flows into the pipe 51 and is led to the outdoor heat exchanger 7, and the on-off valve 23 and the storage amount adjustment valve 57 are closed and stored, and the refrigerant circulation amount is adjusted to be small to suppress the heat radiation temperature from becoming too high.

  When the detected temperature of the first indoor heat exchanger temperature sensor 58 falls below a predetermined value, the storage amount adjusting valve 57 is opened for a predetermined time, and a part of the refrigerant stored in the outdoor heat exchanger 7 is removed. 2 Collected in the compressor 8 via the reflux pipe 56. And the refrigerant | coolant is discharged to the 1st indoor heat exchanger 20 with the compressor 8 which closed the on-off valve 21 and the circulating refrigerant | coolant amount increased, and can recover the lower predetermined temperature to a suitable temperature.

  At the time of heating, the on-off valve 23 is closed, and the compressor 8 passes through the second branch pipe 51, the outdoor heat exchanger 7, the storage amount adjustment valve 57, and the second return pipe 56 to the compressor 8. Since the cycle is not a cycle in which high and low pressure pipes are connected, the refrigerant is not condensed into the liquid refrigerant by the outdoor heat exchanger 7, so that the liquid refrigerant is not recovered by the compressor 8, and the outdoor heat exchanger. The refrigerant amount stored in 7 is a minute refrigerant amount relative to the total refrigerant amount, and the reliability of the compressor 8 can be maintained.

  As a result, the hot / cold switching chamber 1 is narrow and the internal volume of the first indoor heat exchanger 20 is small, the refrigerant circulation amount is excessive, and the heat exchange capacity of the first indoor heat exchanger 20 cannot be ensured sufficiently. Even in this case, storing the surplus refrigerant in the outdoor heat exchanger 7 can prevent the heat radiation temperature of the first indoor heat exchanger 20 from rising abnormally, and a product that is normally heated to 55 ° C. It is possible to prevent the user from being burned by being heated to a temperature higher than that.

  In addition, even when the temperature of the hot / cold switching chamber 1 decreases and the heat radiation temperature of the first indoor heat exchanger 20 decreases after the excess refrigerant is stored in the outdoor heat exchanger 7 due to load fluctuations, the storage amount is adjusted. Since the valve 57 is opened and a part of the refrigerant stored in the outdoor heat exchanger 7 is collected in the compressor 8, the refrigerant circulation amount can be increased and the heat radiation temperature of the first indoor heat exchanger 20 can be recovered. The hot / cold switching chamber 1 can be efficiently heated.

  Next, when heating the hot / cold switching chamber 1 and the hot / cold switching chamber 2, the on-off valves 21, 23, 25, the storage amount adjusting valve 31 and the expansion valves 9, 10 are closed, and the on-off valves 22, 24 are turned on. Open and drive the compressor 8. The refrigerant discharged from the compressor 8 radiates heat in the first indoor heat exchanger 20, and then is decompressed by the expansion valve 11, supplied to the evaporator 6, and cools the cold exclusive chamber 3. Then, the refrigerant evaporated in the third evaporator 6 returns to the compressor 8.

  At this time, when the outside air temperature is lowered, the load of the cold exclusive chamber 3 is reduced, the energization rate of the compressor 8 is reduced, or the refrigerant circulation rate is reduced due to low speed operation in the case of an inverter compressor In addition, the sufficient heating capability for the hot / cold switching chamber 1 cannot be obtained. At this time, the heating heater 34 which is an electric heater is operated to adjust the temperature of the hot / cold switching chamber 1. At this time, the compressor 8 is operated independently of the operation of the heating heater 34, but the heating heater 34 is installed on the discharge side of the indoor fan 27, and the first indoor heat exchanger 20 is installed on the suction side of the indoor fan 27. Therefore, since the indoor fan 27 is in operation when the heating heater 34 is in operation, the discharge air is not directly discharged to the first indoor heat exchanger 20, so the radiant heat of the heating heater 34 is directly The first indoor heat exchanger 20 is not received, the first indoor heat exchanger 20 is heated by the heating heater 34, and the heat radiation temperature rises abnormally, or the liquid refrigerant at the outlet of the first indoor heat exchanger 20 It is possible to avoid the amount from decreasing and the evaporation temperature from decreasing abnormally.

  The temperature of the hot / cold switching chamber 2 is adjusted by the heating heater 26. At this time, if the heating heater 26, the heating heater 34, and the compressor 8 are driven at the same time, a current exceeding the power supply capacity may flow and break down. Therefore, as shown in FIG. For each section, at least one of the heating heater 26, the heating heater 34, and the compressor 8 is stopped. In FIG. 5, the compressor 8 is stopped in the section A, the heating heater 34 is stopped in the section B, and the heating heater 26 is stopped in the section C.

  When the temperature detected by the first indoor heat exchanger temperature sensor 58 exceeds a predetermined value, the on-off valve 21 is opened for a predetermined time, and excess refrigerant is stored in the outdoor heat exchanger 7, and the first indoor heat is When the temperature detected by the exchanger temperature sensor 58 falls below a predetermined value, the storage amount adjusting valve 31 is opened for a predetermined time, and a part of the refrigerant stored in the outdoor heat exchanger 7 is passed through the second reflux pipe 56. Through the compressor 8.

  As a result, even when the hot / cold switching chamber 1 is narrow and the internal volume of the first indoor heat exchanger 20 is small and sufficient heat exchanging capacity cannot be secured, the surplus refrigerant is stored in the outdoor heat exchanger 7 so that It is possible to prevent the heat radiation temperature of the one indoor heat exchanger 20 from rising abnormally, and to provide the user with a product heated at an appropriate temperature.

  In addition, even when the temperature of the hot / cold switching chamber 1 decreases and the heat radiation temperature of the first indoor heat exchanger 20 decreases after the excess refrigerant is stored in the outdoor heat exchanger 7 due to load fluctuations, the storage amount is adjusted. Since the heat release temperature of the first indoor heat exchanger 20 can be recovered by opening the valve 57 and recovering a part of the refrigerant stored in the outdoor heat exchanger 7, the hot / cold switching chamber 1 is made efficient. Can warm well.

  In the embodiment shown in FIGS. 1 and 2, since the first indoor heat exchanger 20 is installed in the hot / cold switching chamber 1 independently of the evaporator 4, it is suitable for cooling and heating, respectively. Although the heat exchanger configuration can be adopted, the evaporator 4 may be used as the condenser 20 by switching the refrigerant flow path.

  Although a flammable refrigerant is used as the refrigerant, the same effect can be obtained even when carbon dioxide, which is a non-flammable natural refrigerant, or an HFC refrigerant having a low global warming potential is used.

  As described above, in the vending machine according to the present invention, when the hot / cold switching chamber is heated, the excess refrigerant is stored in the outdoor heat exchanger, thereby heating the narrow hot / cold switching chamber. In addition, an excessive amount of refrigerant can be avoided to prevent a decrease in the durability of the compressor, and a product heated at an appropriate temperature can be provided to the user.

  In the vending machine according to the present invention, when the hot / cold switching chamber is heated, a plurality of storage chambers are cooled at the same time, thereby suppressing the decrease in the evaporation temperature while ensuring the heating capability. It is possible to prevent a decrease in the durability of the machine.

  As described above, the vending machine according to the present invention avoids excessive refrigerant amount when warming a narrow hot / cold switching chamber by storing excess refrigerant in the outdoor heat exchanger, and durability of the compressor. In addition to preventing deterioration of the performance, by simultaneously cooling a plurality of storage chambers when heating the hot / cold switching chamber, the compressor can be controlled while suppressing the decrease in evaporation temperature while ensuring the heating capacity. Therefore, it can be applied to a system in which a warming operation is performed simultaneously with cooling in a showcase that switches between hot beverage and cold beverage for storage.

The internal block diagram seen from the front of the vending machine main body of Embodiment 1 of this invention AA sectional view of FIG. Refrigerant circuit diagram of vending machine of the embodiment Schematic diagram of the hot / cold switching room of the vending machine of the same embodiment Timing chart showing operation of compressor and heating heater of vending machine of same embodiment Refrigerant circuit diagram of a conventional vending machine

Explanation of symbols

1 First product storage room (hot / cold switching room)
2 Second product storage room (hot / cold switching room)
3 Third product storage room (cold room)
4 First evaporator (switching chamber evaporator)
7 Outdoor heat exchanger 8 Compressor 20 First indoor heat exchanger (switching room heat exchanger)
55 1st recirculation piping 56 2nd recirculation piping 57 Retention amount adjustment valve 58 1st indoor heat exchanger temperature sensor

Claims (6)

  There are a plurality of product storage rooms, and the product storage room includes a cold dedicated room and a hot / cold switching room, an evaporator for cooling the room in the cold dedicated room, and a switch for cooling the room in the hot / cold switching room. A room evaporator and a switching chamber heat exchanger that heats the room are disposed, and the compressor, the switching chamber heat exchanger, and the switching chamber heat exchanger that are connected to the outside of the product storage chamber and the outdoor heat exchange When the hot / cold switching chamber is cooled, the refrigerant discharged from the compressor passes through the outdoor heat exchanger to the switching chamber evaporator and the evaporator. When the hot / cold switching chamber is supplied and heated, the refrigerant discharged from the compressor switches the refrigerant flow path so as to be supplied to the evaporator after passing through the switching chamber heat exchanger. Stuff The case warming temperature of the hot / cold switching compartment is higher than a predetermined temperature, a vending machine, characterized in that to constitute a refrigerant passage for flowing a coolant directly to the outdoor heat exchanger from the compressor.   The vending machine according to claim 1, further comprising a reflux pipe branched from the refrigerant flow path connected to the evaporator on the outlet side of the outdoor heat exchanger and directly connected to the suction pipe of the compressor. Machine.   When there are three or more product storage chambers side by side across the partition wall, and when the refrigerant is heated by flowing through the switching chamber heat exchanger of the hot / cold switching chamber, at least two or more other products The vending machine according to claim 1 or 2, wherein the storage chamber is set to be cooled, and the compressor is operated by flowing a refrigerant through a plurality of evaporators.   The vending machine according to claim 3, wherein a plurality of evaporators are connected in series.   When the refrigerant is supplied to the switching chamber heat exchanger of the hot / cold switching chamber and heated, the evaporators arranged in the product storage chamber adjacent to the hot / cold switching chamber should be connected in series so as to be upstream. 5. The vending machine according to claim 4, wherein   6. The vending machine according to claim 4 or 5, wherein cooling is performed preferentially for a product storage room having a cooling setting in which an evaporator on the upstream side is installed.

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