JP5392491B2 - Refrigerant circuit - Google Patents

Description

  The present invention relates to a refrigerant circuit of a vending machine or the like that cools or heats a product such as a beverage placed in a container such as a can, a bottle, a pack, or a plastic bottle for sale.

  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).

  In this type of vending machine, a plurality of solenoid valves are installed in each heat exchanger inside and outside the warehouse, and by switching the solenoid valves, the heat exchanger in the warehouse acts as a condenser to operate the heat pump. I do. For example, when two rooms are heated and one room is cooled, the heat exchanger outside the chamber is paused, the heat exchanger inside the chamber to be heated acts as a condenser, and the heat exchanger inside the chamber to be cooled is Heat pump operation is performed by switching the solenoid valve so that it acts as an evaporator.

JP 2001-109942 A

  However, in this type of vending machine, when the outside air temperature is low, a heater is used because the condensation temperature of the heat exchanger in the warehouse that acts as a condenser is lowered. Heating by the heater is inferior in thermal efficiency compared to heating by the heat pump operation. Therefore, if the ratio of using the heater increases, the power consumption increases accordingly.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a refrigerant circuit such as a vending machine with low power consumption by solving the above-described problems and limiting the use of a heater as much as possible. .

    In order to achieve the above object, a refrigerant circuit according to claim 1 of the present invention includes a compressor that compresses a refrigerant, an outdoor condenser that condenses the refrigerant, and a first expansion means that expands the refrigerant. A cooling circuit comprising a pipe connected to a first indoor heat exchanger that evaporates the refrigerant and cools the room, and a return pipe connected to the compressor in such a manner that the refrigerant is returned from the first indoor heat exchanger. And the compressor, the second indoor heat exchanger for condensing the refrigerant to heat the room, the second expansion means for expanding the refrigerant, and the second for cooling the room by evaporating the refrigerant. A refrigerant circulation circuit comprising a heating and cooling circulation circuit in which a return pipe is connected to the compressor in a mode in which a refrigerant is returned from the first indoor heat exchanger by connecting a pipe to the indoor heat exchanger of 1; The compressor is a pipe that compresses the refrigerant inside. A ton cylinder part, a refrigerant outflow part for letting out the compressed refrigerant from inside the piston cylinder part, and a refrigerant inflow part into which the refrigerant to be compressed is introduced into the compressor. The discharge pipe directly connected to the refrigerant outflow portion, the suction pipe installed near the opening in the form communicating with the opening of the refrigerant inflow portion, and the opening of the refrigerant inflow portion It has a process pipe installed at a position separated from the suction pipe in a communication mode, and the process pipe and the return pipe are connected.

  A refrigerant circuit according to a second aspect of the present invention is the refrigerant circuit according to the first aspect, further comprising switching means for connecting the return pipe to the process pipe or the suction pipe.

  A refrigerant circuit according to a third aspect of the present invention is the refrigerant circuit according to the second aspect, wherein the switching means connects a return pipe to the process pipe or the suction pipe based on an outside air temperature.

  A refrigerant circuit according to a fourth aspect of the present invention is the refrigerant circuit according to the second aspect, wherein the switching means connects a return pipe to the process pipe or the suction pipe based on an operation mode of cooling and heating. And

  A refrigerant circuit according to a fifth aspect of the present invention is the refrigerant circuit according to any one of the second to fourth aspects, wherein the outdoor evaporator that evaporates the refrigerant in the heating and cooling circuit is connected to the first indoor heat exchanger. When pipe connection is made in parallel with the pipe and the first indoor heat exchanger is stopped, the refrigerant flows through the return pipe via the outdoor evaporator, and the return pipe and the process pipe are connected by the switching means. It is characterized by doing.

  A refrigerant circuit according to a sixth aspect of the present invention is the refrigerant circuit according to any one of the first to fourth aspects, wherein the second indoor heat exchanger is separated into a heat exchanger for cooling and a heating, An expansion valve is connected to each of the indoor heat exchanger and the cooling heat exchanger.

    A refrigerant circuit according to a seventh aspect of the present invention includes a first compressor that compresses the refrigerant, an outdoor condenser that condenses the refrigerant, a first expander that expands the refrigerant, and an indoor chamber that evaporates the refrigerant. An evaporator for cooling the interior, a cooling circuit for cooling the room by a return pipe, a second compressor for compressing the refrigerant, an indoor heat exchanger for condensing the refrigerant and heating the room, and expanding the refrigerant In a refrigerant circuit having a second expander, an outdoor auxiliary heat exchanger for evaporating the refrigerant, and a heating circulation circuit for heating the room by a return pipe, the first and second compressors store the refrigerant therein. A piston cylinder part to be compressed, a refrigerant outflow part for letting out the compressed refrigerant from the inside of the piston cylinder part, and a refrigerant inflow part into which the refrigerant to be compressed is introduced and which has an opening inside the compressor. The refrigerant outflow portion and A discharge pipe to be connected, a suction pipe installed in the vicinity of the opening of the refrigerant inflow portion through a space, and a process pipe installed through a space in a position separated from the opening of the refrigerant inflow portion The return pipe of the cooling circuit is connected to the suction pipe of the first compressor, and the return pipe of the heating circuit is connected to the process pipe of the second compressor.

  According to the first aspect of the present invention, the refrigerant circuit compresses by connecting a process pipe installed via a space and a return pipe for returning the refrigerant to a position separated from the opening of the refrigerant inflow portion of the compressor. Since the refrigerant sucked before the compressor compression process heats up inside the compressor, the discharge temperature of the compressor rises. As a result, the condensation temperature becomes high and the amount of heating heat can be secured, so the use of the heater can be restricted. As a result, power consumption can be kept low.

  The refrigerant circuit according to claim 2-4 according to the present invention has a switching means for connecting the return pipe to the process pipe or the suction pipe, so that the condensation temperature rises when the return pipe is connected to the process pipe. As a result, the use of the heater is restricted and the power consumption can be kept low, and when the return pipe is connected to the suction pipe, the cooling efficiency can be improved by lowering the evaporation temperature.

  In the refrigerant circuit according to the fifth aspect of the present invention, an external evaporator for evaporating the refrigerant in the heating and cooling circuit is provided in parallel between the first internal heat exchanger and a return pipe, and the first When the internal heat exchanger is stopped, the refrigerant flows through the return pipe through the external evaporator, and the return pipe and the process pipe are connected by the switching means, so that the condensation temperature rises and the heater is used. Is limited, so that power consumption can be kept low.

1 is a perspective view showing a vending machine according to Embodiment 1 of the present invention. Sectional drawing of the vending machine shown in FIG. 1 is a refrigerant circuit diagram according to Embodiment 1 of the present invention. FIG. It is a schematic diagram of the compressor of the vending machine shown in FIG. 1, (a) is a top view, (b) is a front view, (c) is a sectional view indicated by AA, and (d) is a sectional view indicated by BB. 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 the three chambers based on Example 1. FIG. The circuit diagram which shows the flow of the refrigerant | coolant in the heat pump operation which heats two chambers based on Example 1, and cools one chamber. Mollier diagram during operation shown in Fig. 7 The refrigerant circuit figure which concerns on Example 2 of this invention. The flow of the refrigerant | coolant in the heat pump driving | operation which cools 2 chambers and heats 1 chamber based on Example 2 is shown, (a) is a circuit diagram when external temperature is high, (b) is when external temperature is low circuit diagram. The refrigerant circuit figure which concerns on Example 3 of this invention. The flow of the refrigerant | coolant in the heat pump driving | operation which cools 2 chambers and heats 1 chamber based on Example 3 is shown, (a) is a circuit diagram when outside temperature is low, (b) is outside temperature at the time of heating 1 chamber The circuit diagram when is high. The refrigerant circuit figure which concerns on Example 4 of this invention. The circuit diagram which shows the flow of the refrigerant | coolant in the heat pump driving | operation which cools 1 chamber and heats 2 chambers based on Example 4. FIG. The refrigerant circuit figure which concerns on Example 5 of this invention. The circuit diagram which shows the flow of the refrigerant | coolant when cooling the three chambers based on Example 5. FIG. The circuit diagram which shows the flow of the refrigerant | coolant in the heat pump driving | operation which cools 2 chambers based on Example 5, and heats 1 chamber.

Example 1
Exemplary embodiments of a refrigerant circuit in a vending machine according to the present invention will be explained below in detail with reference to the accompanying drawings. The present invention is not limited to the first embodiment.

  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 the cooling and heating operation of the vending machine by the temperature sensors Ta, Tb and 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. Is arranged.

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

  The product storage units 40a, 40b, and 40c are for storing products such as canned beverages and beverages containing plastic bottles 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 the discharged product S to the sales port 21 of the outer door through a carry-out door 31 installed in the inner door 30b.

  The cooling / heating unit 60 includes a compressor 61, a condenser 62, a first expander (expansion means) 63, a second expander (expansion means) 79, an accumulator 69, and an auxiliary heat exchanger 76 in the machine room 50. And an evaporator (first indoor heat exchanger) 65a and an internal heat exchanger (also serving as the first and second indoor heat exchangers) 65b and 65c across the bottom plate 11 And having each device connected by refrigerant piping. The cooling / heating unit 60 cools or heats the product S in the product storage rack R by circulating air that has been cooled or heated inside the room (inside the room) according to the operation mode of cooling and heating.

  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.

  Further, as shown in the schematic diagram of FIG. 4, the compressor 61 includes a main body 61 f surrounded by thick cast iron and a gantry 61 a that fixes the compressor 61. The compressor inside 61i includes a piston cylinder part 61pc for compressing the refrigerant, a motor 61m for driving the piston, a discharge port (refrigerant outflow part) 61dp for letting out the compressed refrigerant from the piston cylinder part 61pc, and a compressor inside 61i. A suction port (refrigerant inflow portion) 61sp through which a refrigerant to be compressed is introduced and a discharge pipe 61d, which is three pipes that allow the refrigerant to flow in and out, on the outer peripheral portion of the main body 61f, a suction pipe 61s, the process pipe 61p is welded.

  The discharge pipe 61d is a pipe for discharging the refrigerant compressed in the piston cylinder part 61pc into the refrigerant circuit, and is directly connected to the piston cylinder part 61pc without being communicated with the compressor interior 61i.

  The suction pipe 61s is a pipe for sucking the refrigerant returned from the refrigerant circuit into the suction port 61sp. The suction pipe 61s is connected to the main body 61f at a position near the opening of the suction port 61sp with the opening 61spo facing the compressor interior 61i. The refrigerant sucked from the suction pipe 61s once flows into the main body 61f, and is then sucked into the suction port 61sp and compressed in the piston cylinder portion 61pc.

  The process pipe 61p is a pipe that communicates with the compressor interior 61i and is used for evacuation, refrigerant filling, refrigerant drawing, etc. in the main body 61f. The process pipe 61p is separated from the suction port 61sp as compared with the suction pipe 61s and is connected to the main body 61f with its opening 61po facing the compressor interior 61i. By using the process pipe 61p as the refrigerant suction pipe, the refrigerant flowing into the compressor interior 61i passes through the path indicated by the arrow in FIG. 4D, and is heated during that time.

  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 167, a fan 65f is installed behind them, and a duct 167d 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 167d.

  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 the heating of the product storage units 40b and 40c. Specifically, the internal temperature is below a predetermined temperature. Energized at the time of. The heaters 66b and 66c have a smaller heat generation capacity than conventional ones, and can be omitted depending on the specifications.

  The inside temperature sensors Ta, Tb, Tc are installed on the upper surface of the wind tunnel 167 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 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.

  The relief valve 77 is installed between the compressor 61 and the condenser 62. When the condenser solenoid valve 68 and the heater solenoid valves 68b and 68c fail and the compressor 61 generates abnormal pressure, Is for the condenser 62 to prevent the compressor 61 from being damaged.

The outside air temperature sensor 78 is installed inside the machine room 50 and detects the temperature of outside air.
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 from the discharge pipe 61d of the compressor 61 via the condenser solenoid valve 68, the condenser 62, and the first expander 63, one of the flow dividers 64 being the first. 1 is connected to the collector 67 via the cooler inlet electromagnetic valve 70a and the evaporator 65a, and the other of the flow divider 64 is the second cooler inlet electromagnetic valves 70b and 70c, the internal heat exchanger 65b, 65c is a circuit that is connected to the collector 67 via the cooler outlet electromagnetic valves 72b and 72c, and returns from the collector 67 to the process pipe 61p of the compressor 61 via the return pipe 80 and the accumulator 69. Note that the end of the suction pipe 61s is closed.

  On the other hand, in addition to the cooling circuit 60A, the heating / cooling circuit 60B is connected to the second circuit via heater electromagnetic valves 68b and 68c connected in parallel from the connection point between the compressor 61 and the condenser electromagnetic valve 68. Connected to intermediate points (connection points) 168b and 168c between the cooler inlet solenoid valves 70b and 70c and the inlet side of the internal heat exchangers 65b and 65c, respectively, and checkbacks from the outlet side of the internal heat exchangers 65b and 65c, respectively. After coupling through the valves 71, 71, an auxiliary heat exchanger 76 and a pipe line connected to the distributor 64 via the second expander 79 are provided.

  Thus, the heating / cooling circulation circuit 60B is connected to the internal heat exchangers 65c, 65b from the discharge pipe 61d of the compressor 61 via the heater electromagnetic valves 68b, 68c, and is connected to the internal heat exchangers 65c, 65b. It is connected to the distributor 64 via the auxiliary heat exchanger 76 and the second expander 79 via the valves 71, 71, and from the flow divider 64 to the evaporator 65a via the first cooler inlet electromagnetic valve 70a. The circuit is connected and returns to the process pipe 61p of the compressor 61 via the collector 67, the return pipe 80, 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. 5, a CPU and a memory are provided inside, and control such as compressor operation of a refrigerant circuit and opening / closing of a solenoid valve is performed in accordance with an operation mode of cooling heating determined by setting of an 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 according to the temperatures detected by the internal temperature sensors Ta, Tb, 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. At this time, the refrigerant flows as shown by a thick line in FIG. 6. Specifically, the high-temperature refrigerant compressed by the piston cylinder portion 61 pc of the compressor 61 is discharged from the discharge pipe 61 d and condensed by the condenser 62. It becomes a liquid, expands in the expander 63 to become a low-temperature gas-liquid two-phase flow, is divided into three directions by the flow divider 64, and then 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 storage boxes 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 the accumulator 69, the gas phase enters the process pipe 61p of the compressor 61, is heated by the compressor body 61i in a heated state, and then enters the piston cylinder part 61pc from the suction port 61sp. It is compressed and discharged by the piston cylinder part 61pc. 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 the CHH mode in which the operation mode setting SW91 is operated to cool the left product storage case 40a and the middle and right product storage items 40b and 40c are heated, The valves 68b and 68c and the first cooler inlet solenoid valve 70a are opened, and the condenser solenoid valve 68, the second cooler inlet solenoid valves 70b and 70c, and the cooler outlet solenoid valves 72b and 72c are closed. At this time, the high-temperature refrigerant compressed by the piston cylinder part 61pc of the compressor 61 passes through the heater solenoid valves 68b and 68c and the connection points 168b and 168c from the discharge pipe 61d as shown by the thick line in FIG. It flows into the heat exchangers 65b and 65c. The refrigerant that has flowed into the internal heat exchangers 65b and 65c condenses, heats the product storage 40b and 40c, collects via the check valves 71 and 71, and further condenses in the auxiliary heat exchanger 76 to the second. Flows into the inflator 79. The refrigerant flowing into the second expander 79 expands into a low-temperature and low-pressure gas-liquid two-phase flow, and flows into the evaporator 65a via the flow divider 64 and the first cooler inlet electromagnetic valve 70a. The refrigerant flowing into the evaporator 65a evaporates and cools the commodity storage 40a, and is separated into gas and liquid via the accumulator 69 that collects in the collector 67 and stores the liquid refrigerant. After being heated in the heated body 61f, it enters the piston cylinder 61pc from the suction port 61sp, and is compressed and discharged again by the piston cylinder 61pc. In this heat pump operation, the inside of the cabinet is maintained at an appropriate temperature by the thermocycle operation as described above.

  The operation state of the refrigeration cycle is schematically described by comparing the case where the return pipe 80 and the suction pipe 61s are connected with the case where the return pipe 80 and the process pipe 61p are connected in the Mollier diagram shown in FIG. To do.

  When the return pipe 80 is connected to the suction pipe 61s, the refrigerant circulates along a path indicated by a dotted line in FIG. That is, the refrigerant evaporated in the low-temperature and low-pressure gas phase at the outlet vicinity point Q1 of the evaporator 65a enters the compressor interior 61i via the return pipe 80 and the suction pipe 61s, and then from the suction port 61sp to the piston cylinder portion 61pc. , Is compressed in the piston cylinder portion 61pc, and discharged at a high temperature and high pressure at the outlet portion Q3 of the discharge port 61dp. The discharged refrigerant starts condensing from the vicinity Q4 of the inlet portions of the internal heat exchangers 65c and 65b, ends condensing near the outlet portion Q5 of the internal heat exchangers 65c and 65b, and the high-temperature and high-pressure liquid. Become a phase. This liquid-phase refrigerant expands from the inlet of the second expander 79 and enters a low-temperature and low-pressure gas-liquid two-phase state at the outlet Q6 of the second expander 79. The gas-liquid two-phase refrigerant evaporates in the evaporator 65a to be in a gas phase, and returns to the outlet vicinity point Q1 of the evaporator 65a.

  On the other hand, when the return pipe 80 shown in the first embodiment is connected to the process pipe 61p, the refrigerant circulates along the path indicated by the solid line in FIG. That is, the refrigerant evaporated in the low-temperature and low-pressure gas-phase state at the outlet vicinity point P1 of the evaporator 65a enters the compressor inside 61i via the return pipe 80 and the process pipe 61p, and is heated in the compressor inside 61i. The temperature rises and enters the inlet portion P2 of the piston cylinder portion 61pc from the suction port 61sp. At this time, the temperature is kept higher than Q2. And since the high temperature refrigerant | coolant is compressed in the piston cylinder part 61pc and will be in a high temperature / high pressure state, the refrigerant | coolant of the inside P3 of the discharge port 61dp will be in a further high temperature / high pressure state compared with Q3. That is, the condensation temperature can be kept high. Then, condensation is started at a high condensation temperature in the vicinity P4 of the inlet portions of the internal heat exchangers 65c and 65b, the condensation is ended in the internal heat exchangers 65c and 65b, and a high-temperature and high-pressure liquid phase is obtained. Become. This liquid-phase refrigerant expands from the inlet portion of the second expander 79 and enters a low-temperature and low-pressure gas-liquid two-phase state at the outlet portion P6 of the second expander 79. Then, the gas-liquid two-phase refrigerant evaporates in the evaporator 65a to be in a gas phase, and returns to the outlet vicinity point P1 of the evaporator 65a.

  Thus, by using the process pipe 61p in the suction part of the compressor 61, the refrigerant sucked before the compression process of the compressor 61 is heated in the compressor 61i, so that the discharge temperature of the compressor 61 is As a result of the increase, the condensing temperature can be kept high and the amount of heating heat can be secured. As a result of limiting the use of the heater as much as possible, power consumption can be kept low.

  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.

(Example 2)
The second embodiment relates to a refrigerant circuit according to claim 2 and is a refrigerant circuit in which a return refrigerant is selectively branched from a return pipe 80 to a suction pipe 61s and a process pipe 61p. In the second embodiment, as shown in the refrigerant circuit diagram of FIG. 9, compared to the first embodiment, the pipe from the return pipe 80 is connected to the selection electromagnetic valve 81 and the suction pipe 61 s via the accumulator 69, and The difference is that the selection electromagnetic valve 82 and the pipe connected to the process pipe 61p branch off and are connected to the compressor 61. Since other structures are the same as those of the first embodiment, detailed description thereof is omitted.

  The selection electromagnetic valves 81 and 82 are switching means for the refrigerant circuit. When the outside air temperature is high, the return refrigerant from the return pipe 80 is opened and closed in such a manner that the refrigerant is returned to the suction pipe 61s, and the evaporating temperature is kept low to cool. The efficiency is improved, and when the outside air temperature is low, the heating efficiency is improved by maintaining the condensation temperature high by opening and closing in a manner returning to the process pipe 61p.

  When the operation mode is set to the CHH mode by operating the operation mode setting SW 91 with such a configuration, the control means 90 opens the heater solenoid valves 68b and 68c, the first cooler inlet solenoid valve 70a, and the condenser solenoid valve 68. The second cooler inlet solenoid valves 70b and 70c and the cooler outlet solenoid valves 72b and 72c are closed. When the outside air temperature is higher than a predetermined temperature (for example, 10 ° C.) by the outside air temperature sensor 78, the selection electromagnetic valve 81 is opened and the selection electromagnetic valve 82 is closed. At this time, the high-temperature refrigerant compressed by the piston cylinder portion 61pc of the compressor 61 passes through the heater solenoid valves 68b and 68c and the connection points 168b and 168c from the discharge pipe 61d as shown by the thick line in FIG. It flows into the internal heat exchangers 65b and 65c. The refrigerant flowing into the internal heat exchangers 65b and 65c condenses, heats the product storages 40b and 40c, collects through the check valves 71 and 71, and further condenses in the auxiliary heat exchanger 76 to the second. Flows into the inflator 79. The refrigerant flowing into the second expander 79 expands into a low-temperature and low-pressure gas-liquid two-phase flow, and flows into the evaporator 65a via the flow divider 64 and the first cooler inlet electromagnetic valve 70a. The refrigerant flowing into the evaporator 65a evaporates and cools the commodity storage 40a, enters the suction pipe 61s of the compressor 61 via the collector 67 and the accumulator 69, and immediately passes through the suction port 61sp in the main body 61f. It returns to the piston cylinder part 61pc.

In this way, when the outside air temperature is high, the refrigerant operates in the refrigeration cycle indicated by the dotted line in FIG. 8, so that the evaporating temperature can be lowered, so that the cooling performance can be improved.
When the reading temperature from the outside air temperature sensor 78 is low, the selection electromagnetic valve 81 is closed and the selection electromagnetic valve 82 is opened. At this time, the high-temperature refrigerant compressed by the piston cylinder portion 61pc of the compressor 61 passes through the heater solenoid valves 68b and 68c and the connection points 168b and 168c from the discharge pipe 61d as shown by the thick line in FIG. It flows into the internal heat exchangers 65b and 65c. The refrigerant flowing into the internal heat exchangers 65b and 65c condenses, heats the product storages 40b and 40c, collects through the check valves 71 and 71, and further condenses in the auxiliary heat exchanger 76 to the second. Flows into the inflator 79. The refrigerant flowing into the second expander 79 expands into a low-temperature and low-pressure gas-liquid two-phase flow, and flows into the evaporator 65a via the flow divider 64 and the first cooler inlet electromagnetic valve 70a. The refrigerant flowing into the evaporator 65a evaporates and cools the commodity storage 40a, enters the process pipe 61p of the compressor 61 via the collector 67 and the accumulator 69, and is heated in the main body 61f, and then the suction port. It returns from 61sp to the piston cylinder part 61pc.

  As a result, the temperature of the refrigerant flowing into the compressor 61 rises inside the compressor 61i, and as a result of operating in the refrigeration cycle indicated by the solid line in FIG. 8, the condensation temperature can be increased as in the first embodiment. Therefore, as a result of restricting the use of the heater, power consumption can be reduced.

Note that the selection electromagnetic valves 81 and 82 that are switching means may use three-way valves.
Further, the switching of the selection solenoid valves 81 and 82 may be performed in the cooling and heating operation mode. For example, during the cooling only operation, the return refrigerant from the return pipe 80 is opened and closed in such a manner as to return to the suction pipe 61s, thereby maintaining the evaporation temperature low and improving the cooling efficiency. During the cooling heating operation, the process pipe 61p The heating efficiency may be improved by maintaining the condensation temperature high by opening and closing in the returning mode.

(Example 3)
Example 3 is a refrigerant circuit according to claim 5, in which even when only a heating operation is performed in a plurality of product storages, a heat exchanger for evaporation is provided outside the chamber in such a manner that a heat pump operation can be performed. is there. As shown in FIG. 11, the third embodiment is connected to the outlet portion of the collector 67 from the outlet portion of the flow divider 64 via the electromagnetic valve 83, the external evaporator 65d, and the electromagnetic valve 84, as compared with the second embodiment. The difference is that a pipeline is provided. Since other structures are the same as those of the second embodiment, detailed description thereof is omitted.

  The outside-compartment evaporator 65d is a fin tube type heat exchanger, and is installed in the vicinity of the condenser 62 in the machine room 50, and is connected to the evaporator 65a (first indoor heat exchanger) and the return pipe 80. The pipes are connected in parallel. The outside evaporator 65d is a heat exchanger for evaporating the refrigerant in such a manner that a heat pump operation can be performed when the evaporator 65a product storage only performs a heating operation (also referred to as a single heating operation).

The electromagnetic valves 83 and 84 are for supplying and shutting off the refrigerant to the external evaporator 65d that evaporates the refrigerant during the heat pump operation of only the heating operation described above.
When the operation mode is set to the CHH mode by operating the operation mode setting SW 91 with such a configuration, the control means 90 opens the heater solenoid valves 68b and 68c, the first cooler inlet solenoid valve 70a, and the condenser solenoid valve 68. The second cooler inlet solenoid valves 70b and 70c, the cooler outlet solenoid valves 72b and 72c, and the solenoid valves 83 and 84 are closed. When the outside air temperature sensor 78 detects that the outside air temperature is lower than a predetermined temperature (for example, 10 ° C.), the selection solenoid valve 81 is closed and the selection solenoid valve 82 is opened. At this time, the high-temperature refrigerant compressed by the piston cylinder portion 61pc in the compressor 61 passes through the heater solenoid valves 68b and 68c and the connection points 168b and 168c from the discharge pipe 61d as shown by the thick line in FIG. And flows into the internal heat exchangers 65b and 65c. The refrigerant that has flowed into the internal heat exchangers 65b and 65c condenses, heats the product storage 40b and 40c, collects via the check valves 71 and 71, and further condenses in the auxiliary heat exchanger 76 to the second. Flows into the inflator 79. The refrigerant that has flowed into the second expander 79 expands into a low-temperature and low-pressure gas-liquid two-phase flow, and flows into the evaporator 65a via the flow divider 64 and the first cooler inlet electromagnetic valve 70a. The refrigerant flowing into the evaporator 65a evaporates and cools the commodity storage 40a, enters the process pipe 61p of the compressor 61 via the collector 67, the accumulator 69, and the selection electromagnetic valve 82, and is heated in the main body 61f. After that, the suction port 61sp returns to the piston cylinder 61pc.

  Then, when the product storage case 40a reaches an appropriate temperature (for cooling), the evaporator 65a is stopped, and the internal heat exchangers 65b and 65c are set to a single heating operation. Specifically, the control means 90 closes the first cooler inlet electromagnetic valve 70a from the above state and opens the electromagnetic valves 83 and 84. At this time, the high-temperature refrigerant compressed by the piston cylinder portion 61pc of the compressor 61 is heated by the heater solenoid valves 68b and 68c and the connection points 168b and 168c from the discharge pipe 61d of the compressor 61 as shown by the thick line in FIG. And flows into the internal heat exchangers 65b and 65c. The refrigerant flowing into the internal heat exchangers 65b and 65c condenses, heats the product storages 40b and 40c, collects through the check valves 71 and 71, and further condenses in the auxiliary heat exchanger 76 to the second. Flows into the inflator 79. The refrigerant flowing into the second expander 79 expands to become a low-temperature and low-pressure gas-liquid two-phase flow, and flows into the external evaporator 65d via the flow divider 64 and the electromagnetic valve 83. The refrigerant that has flowed into the outside evaporator 65d absorbs heat outside the warehouse and evaporates to become a gas phase, enters the process pipe 61p of the compressor 61 via the accumulator 69 and the selection electromagnetic valve 82, and enters the compressor body 61f. After being heated inside, it returns from the suction port 61sp to the piston cylinder part 61pc.

  At this time, since the refrigerant circulates in the refrigeration cycle shown by the solid line in the Mollier diagram of FIG. 8, as a result of being able to increase the condensation temperature as in Example 1, the use of the heater is suppressed, and the heating operation is performed. Power consumption can be reduced.

Example 4
Example 4 relates to the refrigerant circuit according to claim 6, and as shown in FIG. 13, as compared with Example 2, the second indoor heat exchanger is separated into cooling and heating heat exchangers. It is a refrigerant circuit which connects an expansion valve to an indoor heat exchanger and a cooling heat exchanger, respectively.

  Specifically, in the cooling circuit 601A, compared with the cooling circuit 60A of the second embodiment, the first expansion valves 63a, 63b, and 63c that also serve as the second expansion valve are the cooler inlet electromagnetic valve 70a, 701b and 701c and the evaporators (first internal heat exchanger) 65a, 651b, and 651c are connected. In addition to the cooling circuit 601A, the heating / cooling circuit 601B includes a heating heat exchanger (second heat exchanger) from the connection point between the compressor 61 and the condenser electromagnetic valve 68 via the heater electromagnetic valves 68b and 68c. The internal heat exchangers 67b and 67c are connected to each other from the outlet side of the heating heat exchangers 67b and 67c via check valves 71 and 71, respectively, and then distributed via the auxiliary heat exchanger 76. And a pipe line connected to the vessel 64.

  Accordingly, the cooling circuit 601A is connected to the flow divider 64 from the discharge pipe 61d of the compressor 61 via the condenser solenoid valve 68 and the condenser 62, one of the flow dividers 64 being the first cooler. The inlet solenoid valves 70a, 701b, 701c, the first expansion valves 63a, 63b, 63c, the evaporators 65a, 651b, 651c are connected to the collector 67, and the collector 67 passes through the return pipe 80 and the accumulator 69. In this circuit, the pipe connected from the selected electromagnetic valve 81 to the suction pipe 61 s of the compressor 61 and the pipe connected from the selected electromagnetic valve 82 to the process pipe 61 p of the compressor 61 are connected in parallel and returned to the compressor 61.

  On the other hand, the heating / cooling circulation circuit 601B is connected from the discharge pipe 61d of the compressor 61 to the heating heat exchangers 67b and 67c via the heater electromagnetic valves 68b and 68c, and from the heating heat exchangers 67b and 67c to the check valve 71, 71, connected to the distributor 64 via the auxiliary heat exchanger 76, and connected to the evaporator 65a from the flow divider 64 via the first cooler inlet solenoid valve 70a and the first expander 63a. A pipe connected from the selected electromagnetic valve 81 to the suction pipe 61s of the compressor 61 and a pipe connected from the selected electromagnetic valve 82 to the process pipe 61p of the compressor 61 are connected in parallel via the compressor 67, the return pipe 80, and the accumulator 69. It is a circuit that is.

  The first expansion valves 63a, 63b, and 63c are for adiabatic expansion by reducing the refrigerant passing during the cooling operation or the cooling and heating operation, and are, for example, a capillary, a temperature expansion valve, and an electronic expansion valve.

  The heating heat exchangers 67b and 67c are for heating the product storage units 40b and 40c, and are arranged behind the evaporators 651b and 651c, and surrounded by the wind tunnel 167 together with the evaporators 651b and 651c. The air sent by the fan 65f is heated to heat the product S in the product storage. Since other structures are the same as those of the first embodiment, detailed description thereof is omitted.

  When the operation mode is set to the CHH mode by operating the operation mode setting SW 91 with such a configuration, the control means 90 opens the heater solenoid valves 68b and 68c, the first cooler inlet solenoid valve 70a, and the condenser solenoid valve 68. The second cooler inlet solenoid valves 701b and 701c are closed. When the outside air temperature is lower than the predetermined temperature by the outside air temperature sensor 78, the selection solenoid valve 81 is closed and the selection solenoid valve 82 is opened. At this time, the high-temperature refrigerant compressed by the piston cylinder part 61pc of the compressor 61 flows into the heating heat exchangers 67b and 67c from the discharge pipe 61d via the heater electromagnetic valves 68b and 68c as shown by the thick lines in FIG. To do. The refrigerant that has flowed into the heating heat exchangers 67b and 67c condenses, heats the product storages 40b and 40c, collects through the check valves 71 and 71, further condenses in the auxiliary heat exchanger 76, and then condenses. Flow into. The refrigerant flowing into the flow divider 64 passes through the first cooler inlet electromagnetic valve 70a, expands in the first expander 63a, becomes a low-temperature low-pressure gas-liquid two-phase flow, and flows into the evaporator 65a. . The refrigerant flowing into the evaporator 65a evaporates and cools the commodity storage 40a, and enters the process pipe 61p in the compressor 61 through the collector 67, the return pipe 80, the accumulator 69, and the selection electromagnetic valve 82. After being heated in the main body 61f, the suction port 61sp returns to the piston cylinder 61pc.

  When the outside air temperature is low in this way, the temperature of the refrigerant flowing into the compressor 61 rises inside the compressor 61. Therefore, as a result of operating in the refrigeration cycle indicated by the solid line in FIG. Similarly, since the condensation temperature can be increased, the use of the heater is restricted, and as a result, power consumption can be reduced.

  When the outside air temperature is high, the selection electromagnetic valve 81 is opened and the selection electromagnetic valve 82 is closed. As a result, since the refrigerant operates in the refrigeration cycle indicated by the dotted line in FIG. 8, the evaporating temperature can be lowered, and the cooling performance can be improved.

(Example 5)
Example 5 relates to the refrigerant circuit according to claim 7, and as shown in the refrigerant circuit of FIG. 15, the first compressor 611 is used exclusively for cooling, and the second compressor 612 is also used for cooling and heating. A cooling circulation circuit 602A dedicated to cooling the two product storages 40a and 40b, and a second cooling heating circulation circuit 602B used for cooling and heating by switching the four-way valve 84 for the one product storage 40c. It is a refrigerant circuit which has.

  The first compressor 611 and the second compressor 612 have substantially the same structure as the compressor 61, and the compressor interior 61i has piston cylinder portions 611pc and 612pc, and suction ports 611sp and 612sp. In addition, discharge pipes 611d and 612d, suction pipes 611s and 612s, and process pipes 611p and 612p, which are three pipes that allow the refrigerant to flow in and out, are welded to the outer periphery of the compressor body.

The four-way valve 84 has four connection pipes, and connects two connection pipes as shown by a solid line or a dotted line in FIG.
The cooling circuit 602A is connected to the flow divider 64 via the condenser 62 from the discharge pipe 611d of the first compressor 611 dedicated to cooling, and is connected to the first cooler inlet electromagnetic valve 70a from the flow divider 64, respectively. , 701b, the first expanders 63a and 63b, and the evaporators 65a and 651b, connected to the collector 67, and from the collector 67 to the suction pipe 611s of the compressor 611 via the return pipe 80 and the accumulator 69. Return circuit. Note that the end of the process pipe 611p is closed.

  On the other hand, the heating / cooling circulation circuit 602B includes a four-way valve 84 (connected by piping indicated by a dotted line in the drawing) and an auxiliary heat exchanger 76, from a discharge pipe 612d of the second compressor 612 that also serves as cooling and heating. A return pipe 80 from a four-way valve 84 (connected by piping shown by a dotted line in the figure) via the second cooler inlet electromagnetic valve 70c, the first expander 63c, and the internal heat exchanger 65c. A four-way valve 84 (shown by a solid line in the figure) from a cooling circuit 602BA that returns to the suction pipe 612s of the compressor 612 via the accumulator 69 and the selection electromagnetic valve 81, and a discharge pipe 612d of the compressor 612 that also serves as cooling and heating. And an internal heat exchanger (indoor heat exchanger) 65c, a second expander 79, a heating electromagnetic valve 68c, an auxiliary heat exchanger 76, a four-way valve 84 (in the solid line in the figure) Via to) connected by pipe to be, return pipe 80, accumulator 69, and a heating circulation circuit 602BB which via a selection solenoid valve 82 returns to the process pipe 612p of the compressor 612.

  Therefore, the cooling circuit 602A and the cooling circuit 602BA are used in the operation mode in which the entire interior is cooled, and the cooling circuit 602A and the heating circuit 602BB are used in the cooling and heating operation mode. Since other structures are the same as those of the first embodiment, detailed description thereof is omitted.

  When the operation mode is set to the CCC mode by operating the operation mode setting SW 91 with such a configuration, the control unit 90 includes the first cooler inlet solenoid valves 70a and 701b, the second cooler inlet solenoid valve 70c, and the selection solenoid valve 81. Is opened, the heating electromagnetic valve 68c and the selection electromagnetic valve 82 are closed, and the four-way valve 84 is operated in such a manner that it is connected by piping indicated by a dotted line in the drawing. A circuit in which the refrigerant circulates at this time is indicated by a thick line in FIG. That is, in the cooling circuit 602A, the high-temperature refrigerant compressed by the piston cylinder portion 611pc of the first compressor 611 is discharged from the discharge pipe 611d and condensed by the condenser 62 to become a liquid. After being diverted, the first expander 63a, 63b expands through the first cooler solenoid valves 70a, 701b to form a low-temperature gas-liquid two-phase flow and flows into the evaporators 65a, 651b. The refrigerant that has flowed in is evaporated by the evaporators 65a and 651b to cool the product storage boxes 40a and 40b, and the evaporated refrigerant is separated by gas-liquid separation via the accumulator 69 that collects in the collector 67 and stores the liquid refrigerant. The suction pipe 611s of the first compressor 611 is entered, and immediately returns from the suction port 611sp to the piston cylinder portion 611pc from within the main body of the compressor 611. 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.

  Further, in the cooling and heating circuit 602B, the high-temperature refrigerant compressed by the piston cylinder portion 612pc of the second compressor 612 is discharged from the discharge pipe 612d, and the four-way valve 84 (a connection pipe indicated by a dotted line in the figure). ) From the auxiliary heat exchanger 76 to become liquid, and expands in the first expander 63c from the second cooler inlet solenoid valve 70c to become a low-temperature gas-liquid two-phase flow, and in the internal heat exchanger 65c The product storage 40c is evaporated to cool, and the evaporated refrigerant passes through a return pipe 80, an accumulator 69, and a selection electromagnetic valve 81 from a four-way valve 84 (connection pipe indicated by a dotted line in the figure). Return to the suction pipe 612s.

At this time, since the refrigerant operates in the refrigeration cycle indicated by the dotted line in FIG. 8, the evaporating temperature can be lowered, and the cooling performance can be improved.
Next, when the operation mode is set to the CCH mode in which the operation mode setting SW 91 is operated to cool the left and center product storage units 40a and 40b and to heat the right product storage unit 40c, the control unit 90 performs the first operation. The cooler inlet solenoid valves 70a and 701b, the heater solenoid valve 68c, and the selection solenoid valve 82 are opened, and the second cooler inlet solenoid valve 70c and the selection solenoid valve 81 are closed.

  A circuit in which the refrigerant circulates at this time is indicated by a thick line in FIG. That is, in the cooling circulation circuit 602A, the same refrigerant circulation as described above is performed. On the other hand, in the cooling and heating circuit 602B, the refrigerant flows into the internal heat exchanger 65c from the discharge pipe 612d of the second compressor 612 via the four-way valve 84 (connection pipe indicated by a solid line in the drawing). Then, the product storage 40c is condensed by condensing in the internal heat exchanger 65c, and the condensed refrigerant expands in the second expander 79 to become a gas-liquid two-phase flow, and the heating electromagnetic valve 68c is turned on. Via the auxiliary heat exchanger 76, it evaporates to become a gas phase, and the return pipe 80, the accumulator 69, and the selection solenoid valve 82 are connected via a four-way valve 84 (connection pipe indicated by a solid line in the figure). Via the process pipe 612p of the compressor 612.

  At this time, since the refrigerant circulates in the refrigeration cycle indicated by the solid line of the Mollier diagram in FIG. 8, the condensation temperature can be increased as in the first embodiment. As a result, the heating operation is performed without using the heater, and the consumption Electric power can be reduced.

  In addition, although switching of the selection solenoid valves 81 and 82 was performed in the operation mode of cooling heating, you may perform it by external temperature like Example 2. FIG.

  As described above, the refrigerant circuit according to the present invention is suitable for a refrigerant circuit of 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 by cooling or heating it.

DESCRIPTION OF SYMBOLS 10 Main body cabinet 20 Outer door 30 Inner door 40a, 40b, 40c Merchandise storage 60 Cooling / heating unit 61 Compressor 61d Discharge pipe 61p Process pipe 61sp Suction port 62 Condenser 63 First expander 64 Current divider 65a Evaporator 65b , 65c Internal heat exchanger 68 Condenser solenoid valve 68a, 68b Heater solenoid valve 70a First cooler inlet solenoid valve 70b, 70c Second cooler inlet solenoid valve 72b, 72c Cooler exit solenoid valve 79 Second Expander 80 Return pipe 81 Selection solenoid valve (switching means)
82 Selection solenoid valve (switching means)
90 Controller 91 Operation mode selection SW

Claims (7)

A compressor that compresses the refrigerant, an outdoor condenser that condenses the refrigerant, a first expansion means that expands the refrigerant, and a first indoor heat exchanger that evaporates the refrigerant and cools the room are connected by piping. , Constituting a cooling circuit comprising a return pipe connected to the compressor in a manner to return the refrigerant from the first indoor heat exchanger,
The compressor, the second indoor heat exchanger for condensing the refrigerant to heat the room, the second expansion means for expanding the refrigerant, and the first indoor heat exchange for cooling the room by evaporating the refrigerant. In a refrigerant circulation circuit that constitutes a heating and cooling circulation circuit in which a return pipe is connected to the compressor in a mode in which the refrigerant is returned from the first indoor heat exchanger by connecting a pipe to the compressor,
The compressor includes a piston cylinder portion that compresses the refrigerant therein, a refrigerant outflow portion that causes the compressed refrigerant to flow out of the piston cylinder portion, and a refrigerant that has an opening inside the compressor and into which the refrigerant to be compressed is introduced. An inflow portion,
Outside the compressor, a discharge pipe directly connected to the refrigerant outflow portion, a suction pipe installed near the opening in a manner communicating with the opening of the refrigerant inflow portion, and the refrigerant inflow A refrigerant circuit characterized by having a process pipe installed at a position separated from the suction pipe in a form communicating with the opening of the section, and connecting the process pipe and the return pipe.   The refrigerant circuit according to claim 1, further comprising switching means for connecting the return pipe to the process pipe or the suction pipe.   The refrigerant circuit according to claim 2, wherein the switching unit connects a return pipe to the process pipe or the suction pipe based on an outside air temperature.   The refrigerant circuit according to claim 2, wherein the switching unit connects a return pipe to the process pipe or the suction pipe based on an operation mode of cooling and heating.   When an outdoor evaporator that evaporates the refrigerant in the heating / cooling circuit is connected in parallel between the first indoor heat exchanger and the return pipe, and the first indoor heat exchanger is stopped, the outdoor evaporation The refrigerant circuit according to any one of claims 2 to 4, wherein the refrigerant is caused to flow through the return pipe through a vessel, and the return pipe and the process pipe are connected by a switching unit.   The second indoor heat exchanger is separated into a cooling heat exchanger and a heating heat exchanger, and an expansion valve is connected to each of the first indoor heat exchanger and the cooling heat exchanger. Item 5. The refrigerant circuit according to any one of Items 1 to 4. A first compressor that compresses the refrigerant, an outdoor condenser that condenses the refrigerant, a first expander that expands the refrigerant, an evaporator that evaporates the refrigerant and cools the room, and a return pipe. A cooling circulation circuit for cooling,
A second compressor for compressing the refrigerant, an indoor heat exchanger for condensing the refrigerant to heat the room, a second expander for expanding the refrigerant, an outdoor auxiliary heat exchanger for evaporating the refrigerant, and a return pipe In the refrigerant circuit having a heating circulation circuit for heating the room by
The first and second compressors include a piston cylinder part that compresses the refrigerant therein, a refrigerant outflow part that causes the compressed refrigerant to flow out of the piston cylinder part, and an refrigerant that has an opening inside the compressor and compresses the refrigerant. And a refrigerant inflow portion to be introduced,
A discharge pipe directly connected to the refrigerant outflow portion on the outside, a suction pipe installed via a space in the vicinity of the opening of the refrigerant inflow portion, and a space separated from the opening of the refrigerant inflow portion. A return pipe of the cooling circulation circuit is connected to the suction pipe of the first compressor, and a return pipe of the heating circulation circuit is connected to the process pipe of the second compressor. A refrigerant circuit characterized by that.

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