JP2016186402A - Refrigerant circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To successfully perform an independent heating operation regardless of an outside air temperature.SOLUTION: A refrigerant circuit device 10 includes a refrigerant circuit 10a that has: a main path 20; a high pressure refrigerant introduction path 30 for supplying a refrigerant compressed by a compressor 21 in the main path 20 to a heating interior heat exchanger when the refrigerant is introduced by a four-way valve 22 constituting the main path 20; and a heat radiation path 40 for supplying the refrigerant that has passed through the heating interior heat exchanger to an upstream side of an exterior heat exchanger 23 in the main path 20. The refrigerant circuit device includes: a bypass pipe line 51 that is branched from a refrigerant pipe line 26 connected to the outlet side of the exterior heat exchanger 23 and is connected to a process pipe 218 of the compressor 21; a bypass valve 52 disposed in the bypass pipe line 51 so as to be openable/closable; and control means 10b for introducing the refrigerant compressed by the compressor 21 to the high pressure refrigerant introduction path 30 and making the refrigerant passed through the exterior heat exchanger 23 pass through the bypass pipe line 51 when an independent heating operation is performed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a refrigerant circuit device, and more particularly to a refrigerant circuit device that is applied to, for example, a vending machine and includes a refrigerant circuit having a heat pump function.

  Conventionally, the following is known as a refrigerant circuit device including a refrigerant circuit having a heat pump function. That is, a refrigerant circuit having a main path, a high-pressure refrigerant introduction path, a heat radiation path, and a return path is provided.

  The main path is configured in an annular shape by sequentially connecting the internal heat exchanger, the compressor, the external heat exchanger, and the expansion mechanism through the refrigerant pipe. The internal heat exchanger is disposed inside a target room. The compressor sucks the refrigerant that has passed through the internal heat exchanger, compresses the sucked refrigerant, and discharges it in a high-temperature and high-pressure state. The external heat exchanger introduces and condenses the refrigerant compressed by the compressor. The expansion mechanism depressurizes the refrigerant condensed in the external heat exchanger and adiabatically expands it.

  In such a main path, the refrigerant compressed by the compressor is condensed by the external heat exchanger, and the condensed refrigerant is adiabatically expanded by the expansion mechanism and evaporated by the internal heat exchanger. The refrigerant evaporated in the internal heat exchanger is sucked by the compressor, compressed again, and circulated. Thereby, the internal air of the chamber in which the internal heat exchanger is disposed is cooled.

  The high-pressure refrigerant introduction path introduces the refrigerant compressed by the compressor, and supplies it to the one disposed in the chamber to be heated among the internal heat exchangers constituting the main path. In this way, the refrigerant is condensed. Thereby, the internal air of the chamber in which the internal heat exchanger is disposed is heated.

  The heat radiation path introduces the refrigerant condensed in the internal heat exchanger and supplies it to the external heat exchanger. As a result, in the external heat exchanger, the passing refrigerant exchanges heat with ambient air and evaporates.

  The return path is a mode in which the refrigerant evaporated in the external heat exchanger is introduced and returned to the main path in a mode of being sent to the compressor. As a result, the refrigerant that has passed through the return path reaches the main path and is then sent to the compressor.

  In the refrigerant circuit device having such a configuration, when only cooling the internal air of a corresponding chamber (when performing a single cooling operation), the refrigerant may be circulated only in the main path. On the other hand, when cooling the internal air of one chamber and heating the internal air of the other chamber (when performing cooling heating operation), a part of the refrigerant compressed by the compressor is circulated in the main path, In addition, another part of the refrigerant may be circulated in the order of the high-pressure refrigerant introduction path, the heat radiation path, and the return path. Furthermore, when only heating the internal air of the corresponding chamber (when performing heating only operation), the refrigerant compressed by the compressor is passed through the high-pressure refrigerant introduction path, the heat radiation path, and the return path in this order. It may be circulated so as to return to (for example, see Patent Document 1).

JP 2000-304397 A

  By the way, in the refrigerant circuit device as described above, when performing the heating single operation, the external heat exchanger is used as an evaporator. In order to use the external heat exchanger as an evaporator, it is necessary that the temperature of the ambient air of the external heat exchanger is sufficiently high.

  However, when heating the internal air of the target room, it is generally in an environment where the outside air temperature is low, so that the refrigerant cannot be sufficiently evaporated by the external heat exchanger, and this As a result, there is a possibility that it is difficult to condense the refrigerant satisfactorily with the internal heat exchanger, and the single heating operation may not be performed satisfactorily.

  An object of this invention is to provide the refrigerant circuit apparatus which can perform a heating independent operation favorably irrespective of the outside temperature in view of the said situation.

  In order to achieve the above object, a refrigerant circuit device according to the present invention includes an internal heat exchanger disposed inside a chamber, and a compressor that sucks and compresses the refrigerant that has passed through the internal heat exchanger. And an external heat exchanger disposed outside the chamber, and an expansion mechanism for adiabatically expanding the refrigerant that has passed through the external heat exchanger, sequentially connected by a refrigerant pipe And when the introduction of the refrigerant is permitted by the switching valve provided in the refrigerant pipe on the discharge side of the compressor, the refrigerant compressed by the compressor becomes a heating target in the internal heat exchanger. High-pressure refrigerant introduction path for supplying to the heat exchanger in the heating chamber disposed in the chamber, and heat dissipation for supplying the refrigerant that has passed through the heat exchanger in the heating chamber to the upstream side of the external heat exchanger in the main path A refrigerant circuit having a path, and the compressor is disposed inside the compressor body, and A piston cylinder part that compresses the refrigerant that has flowed in through an opening that communicates with the internal space of the compressor body; and the piston cylinder part that is disposed directly connected to the piston cylinder part outside the compressor body; A first pipe for supplying the refrigerant compressed in step (b) to the refrigerant pipe on the discharge side, and a state communicating with the internal space of the compressor body outside the compressor body, and the internal heat exchange A second pipe connected to a refrigerant pipe for sucking the refrigerant that has passed through the compressor, and communicates with an internal space of the compressor body outside the compressor body, and the opening is more than the second pipe. In the refrigerant circuit device comprising a third pipe disposed in a manner separated from the refrigerant pipe, the refrigerant circuit device is separated from the refrigerant pipe connected to the outlet side of the external heat exchanger and coupled to the third pipe. Ba When the passage is opened and opened, the refrigerant is allowed to pass through the bypass pipe, and when it is closed, the refrigerant passes through the bypass pipe. When performing a single heating operation that only heats the internal air of the chamber in which the bypass valve that restricts the heat exchanger and the heat exchanger in the heating chamber is disposed, the compression state is adjusted by adjusting the delivery state of the switching valve Control that causes the refrigerant compressed by the machine to be introduced into the high-pressure refrigerant introduction path and opens the bypass valve so that the refrigerant that has passed through the external heat exchanger passes through the bypass pipe line Means.

  In the refrigerant circuit device according to the present invention, the control unit heats the internal air of the chamber in which the heat exchanger in the heating chamber is disposed and the chamber in which the other heat exchanger in the chamber is disposed. When performing a cooling and heating operation for cooling the internal air, the delivery state of the switching valve is adjusted so that the refrigerant compressed by the compressor is introduced into the high-pressure refrigerant introduction path, and the bypass valve And the refrigerant that has passed through the external heat exchanger is adiabatically expanded by the expansion mechanism and sent to the internal heat exchanger.

  In the refrigerant circuit device according to the present invention, in the refrigerant circuit device, when the control unit performs a single cooling operation for cooling only the internal air of any of the chambers, The compressed refrigerant passes through the outside heat exchanger, and the bypass valve is closed and the refrigerant that has passed through the outside heat exchanger is adiabatically expanded by the expansion mechanism to exchange heat inside the box. It is characterized by being sent to a container.

  According to the present invention, the bypass pipe separated from the refrigerant pipe connected to the outlet side of the external heat exchanger is connected to the third pipe of the compressor, and the control means performs the heating single operation. In addition, the refrigerant compressed by the compressor is introduced into the high-pressure refrigerant introduction path by adjusting the delivery state of the switching valve, and the refrigerant that has passed the external heat exchanger by opening the bypass valve is bypass pipe Since the refrigerant passes through the path, the refrigerant sucked by the compressor can be heated by the drive source of the compressor, thereby improving the heating capacity. Therefore, there is an effect that the heating single operation can be favorably performed regardless of the outside air temperature.

FIG. 1 is a sectional view showing a case where an internal structure of a vending machine to which a refrigerant circuit device according to an embodiment of the present invention is applied is viewed from the front. FIG. 2 shows the internal structure of the vending machine shown in FIG. 1, and is a cross-sectional side view of the right commodity storage. FIG. 3 is a conceptual diagram conceptually showing a refrigerant circuit device constituting the vending machine shown in FIG. FIG. 4 is a plan view schematically showing the configuration of the compressor shown in FIGS. 2 and 3. FIG. 5 is a side view schematically showing the configuration of the compressor shown in FIGS. 2 and 3. FIG. 6 is a plan view schematically showing the periphery of the compressor in the machine room of the main body cabinet. FIG. 7 is a chart showing the results of measuring the wind speed of the passing air on the rear side of the external fan, that is, the rear side of the external heat exchanger when the external fan is driven. FIG. 8 is an explanatory diagram schematically showing the flow of refrigerant in the refrigerant circuit device shown in FIG. 3. FIG. 9 is an explanatory view schematically showing the flow of refrigerant in the refrigerant circuit device shown in FIG. FIG. 10 is an explanatory view schematically showing the flow of refrigerant in the refrigerant circuit device shown in FIG. FIG. 11 is a conceptual diagram conceptually showing a modification of the refrigerant circuit device. FIG. 12 is a plan view schematically showing the configuration of the compressor shown in FIG. FIG. 13 is a side view schematically showing the configuration of the compressor shown in FIG. 11. FIG. 14 is an explanatory diagram schematically showing the refrigerant flow of the refrigerant circuit device shown in FIG. 11. FIG. 15 is an explanatory diagram schematically showing the flow of refrigerant in the refrigerant circuit device shown in FIG. FIG. 16 is an explanatory diagram schematically showing the refrigerant flow of the refrigerant circuit device shown in FIG. 11.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a refrigerant circuit device according to the present invention will be described in detail with reference to the accompanying drawings as appropriate.

  FIG. 1 is a sectional view showing a case where an internal structure of a vending machine to which a refrigerant circuit device according to an embodiment of the present invention is applied is viewed from the front. The vending machine exemplified here includes a main body cabinet 1, a refrigerant circuit device 10, and a drain water evaporation device 60.

  The main body cabinet 1 is a vending machine main body having a rectangular shape with an open front surface. The main body cabinet 1 is provided with three independent commodity storage boxes 3 partitioned by two heat insulating partition plates 2 in the left and right sides, for example. The commodity storage 3 is a room for storing commodities such as canned beverages and plastic bottled beverages while being maintained at a desired temperature, and has a heat insulating structure.

  FIG. 2 shows the internal structure of the vending machine shown in FIG. 1 and is a cross-sectional side view of the right product storage case 3. Here, the internal structure of the right product storage (hereinafter also referred to as right storage) 3a is shown, but the central product storage (hereinafter also referred to as intermediate storage) 3b and the left product storage (hereinafter referred to as right storage) 3a. The internal structure of 3c is also substantially the same as that of the right warehouse 3a. In the present specification, the right side indicates the right side when the vending machine is viewed from the front, and the left side indicates the left side when the vending machine is viewed from the front.

  As shown in FIG. 2, an outer door 4 and an inner door 5 are provided on the front surface of the main body cabinet 1. The outer door 4 is for opening and closing the front opening of the main body cabinet 1, and the inner door 5 is for opening and closing the front surface of the commodity storage 3. The inner door 5 is divided into upper and lower parts, and the upper door 5a opens and closes when a product is replenished.

  The commodity storage 3 is provided with a storage rack 6, a carry-out mechanism 7 and a carry-out shooter 8. The storage rack 6 is used for storing products in a manner of being arranged in the vertical direction. The carry-out mechanism 7 is provided in the lower part of the storage rack 6 and is used to carry out the products at the lowest level of the product group stored in the storage rack 6 one by one. The carry-out shooter 8 is for guiding the product carried out from the carry-out mechanism 7 to the product take-out port 4 a provided in the outer door 4.

  FIG. 3 is a conceptual diagram conceptually showing the refrigerant circuit device 10 constituting the vending machine shown in FIG. The refrigerant circuit device 10 exemplified here includes a refrigerant circuit 10 a having a main path 20, a high-pressure refrigerant introduction path 30, a heat radiation path 40, and a bypass path 50, and control means 10 b that appropriately controls each part provided in the refrigerant circuit 10 a. It is configured with.

  The main path 20 is configured by appropriately connecting a compressor 21, a four-way valve 22, an external heat exchanger 23, an expansion mechanism 24, and an internal heat exchanger 25 through a refrigerant pipe 26, and refrigerant is contained therein. It is enclosed.

  The compressor 21 is disposed in the machine room 9 as shown in FIG. The machine room 9 is a room inside the main body cabinet 1, partitioned from the product storage 3 and below the product storage 3. The compressor 21 sucks the refrigerant through the suction port, compresses the sucked refrigerant, and discharges it into a high-temperature and high-pressure state (high-temperature and high-pressure refrigerant).

  4 and 5 schematically show the configuration of the compressor 21 shown in FIGS. 2 and 3, respectively. FIG. 4 is a plan view and FIG. 5 is a side view. As shown in FIGS. 4 and 5, the compressor 21 includes a compressor main body 211, a piston cylinder portion 212, a motor 213, a discharge port 214, a suction port 215, and a discharge pipe (first pipe). 216, a suction pipe (second pipe) 217, and a process pipe (third pipe) 218.

  The compressor main body 211 is a case made of thick cast iron and has a substantially circular cross section. The piston cylinder part 212 is provided inside the compressor body 211 and compresses the refrigerant. The motor 213 is provided inside the compressor main body 211 and is a drive source that drives a piston constituting the piston cylinder unit 212.

  The discharge port 214 is provided inside the compressor main body 211 and is a refrigerant outflow part for allowing the refrigerant compressed by the piston cylinder part 212 to flow out. The suction port 215 is a refrigerant inflow portion that is provided inside the compressor main body 211 and allows the refrigerant to flow into the piston cylinder portion 212 through an opening 215 a communicating with the inside of the compressor main body 211.

  The discharge pipe 216 is directly connected to the piston cylinder part 212 via the discharge port 214 and is disposed so as to protrude to the outside of the compressor body 211, and discharges the refrigerant compressed by the piston cylinder part 212. belongs to.

  Suction pipe 217 is arranged in a manner that protrudes outside compressor body 211 in the vicinity of opening 215 a of suction port 215. Although the details will be described later, the suction pipe 217 is for sucking the refrigerant. The refrigerant sucked by the suction pipe 217 once flows into the compressor main body 211 and then flows into the piston cylinder part 212 via the suction port 215.

  The process pipe 218 is disposed so as to protrude from the compressor main body 211 at a position farther from the opening 215 a of the suction port 215 than the suction pipe 217. The process pipe 218 has existed for a long time, and is used for evacuation, refrigerant filling, refrigerant drawing, and the like inside the compressor body 211.

  The four-way valve 22 has one inlet 221 and three outlets (a first outlet 222, a second outlet 223, and a third outlet 224), and the inlet 221 according to a command given from the control means 10b. A first delivery state in which the inlet 221 communicates with the first outlet 222, a second delivery state in which the inlet 221 communicates with the second outlet 223, a third delivery state in which the inlet 221 communicates with the third outlet 224, and an inlet 221 This is a switching valve that can be switched to any one of the fourth delivery states that allow the second outlet 223 and the third outlet 224 to communicate with each other. The refrigerant pipe 26 connected to the discharge pipe 216 of the compressor 21 is connected to the inlet 221 of the four-way valve 22.

  As shown in FIG. 2, the external heat exchanger 23 is disposed in the machine room 9 similarly to the compressor 21. The external heat exchanger 23 exchanges heat between the refrigerant passing through and the ambient air. An outdoor fan F1 is provided in the vicinity of the rear side of the external heat exchanger 23. The refrigerant pipe 26 connected to the inlet side of the external heat exchanger 23 is connected to the first outlet 222 of the four-way valve 22.

  As shown in FIG. 2, the expansion mechanism 24 is disposed in the machine room 9 similarly to the compressor 21 and the external heat exchanger 23. The expansion mechanism 24 depressurizes the passing refrigerant and adiabatically expands it, and includes a first electronic expansion valve 241, a second electronic expansion valve 242, and a third electronic expansion valve 243.

  The first electronic expansion valve 241, the second electronic expansion valve 242, and the third electronic expansion valve 243 are divided into three by a distributor 271 connected to the refrigerant pipe 26 connected to the outlet side of the external heat exchanger 23. The refrigerant pipes 26 are branched to the refrigerant pipes 26 respectively.

  Here, the opening degree of each of the first electronic expansion valve 241, the second electronic expansion valve 242, and the third electronic expansion valve 243 constituting the expansion mechanism 24 is adjusted according to a command given from the control means 10b.

  A plurality of (3 in the illustrated example) internal heat exchangers 25 are provided, which are disposed in the lower interior of each product storage 3 and on the front side of the rear duct D (see FIG. 2). ing. An internal heat exchanger (hereinafter also referred to as a right internal heat exchanger) 25a disposed in the right chamber 3a is an internal heat disposed in the intermediate chamber 3b on the downstream side of the first electronic expansion valve 241. An exchanger (hereinafter also referred to as an internal heat exchanger) 25b is an internal heat exchanger (hereinafter, left internal heat) disposed in the left chamber 3c on the downstream side of the second electronic expansion valve 242. 25c is also connected to the refrigerant line 26 in a manner located on the downstream side of the third electronic expansion valve 243.

  In addition, between the first electronic expansion valve 241 and the right internal heat exchanger 25a, between the second electronic expansion valve 242 and the internal heat exchanger 25b, and between the third electronic expansion valve 243 and the left internal heat. A first capillary tube 272, a second capillary tube 273, and a third capillary tube 274 are provided between the exchanger 25c.

  Further, a first check valve 275 is provided between the second electronic expansion valve 242 and the second capillary tube 273, and a second check valve is provided between the third electronic expansion valve 243 and the third capillary tube 274. A valve 276 is provided.

  The refrigerant pipes 26 connected to the outlet side of the inner-compartment heat exchanger 25b and the left-hand inner heat exchanger 25c merge at the first junction P1, and the merged refrigerant pipe 26 further includes the right-house internal heat. The refrigerant 25 and the second junction P2 merge with the outlet side of the exchanger 25a. The refrigerant pipe 26 joined at the second junction P2 is connected to the suction pipe 217 of the compressor 21.

  In the refrigerant pipe 26 connected to the outlet side of the internal heat exchanger 25b, a first return electromagnetic valve 277 is disposed on the upstream side of the first junction P1. The first feedback solenoid valve 277 is a valve body that can be opened and closed. When the opening command is given from the control means 10b, the first feedback solenoid valve 277 opens and allows the refrigerant to pass, while when the closing command is given. It closes and regulates the passage of refrigerant.

  A second return solenoid valve 278 is disposed upstream of the first junction P1 in the refrigerant line 26 connected to the outlet side of the left-side heat exchanger 25c. The second feedback solenoid valve 278 is a valve body that can be opened and closed. When the opening command is given from the control means 10b, the second feedback solenoid valve 278 opens and allows the refrigerant to pass therethrough, whereas when the closing command is given. It closes and regulates the passage of refrigerant.

  The high pressure refrigerant introduction path 30 includes a first high pressure refrigerant pipe 31 and a second high pressure refrigerant pipe 32. One end of the first high-pressure refrigerant pipe 31 is connected to the second outlet 223 of the four-way valve 22, and the other end joins the third junction P3 of the refrigerant pipe 26 on the inlet side of the internal heat exchanger 25b. To do. The first high-pressure refrigerant pipe 31 supplies the high-pressure refrigerant compressed by the compressor 21 to the internal heat exchanger 25b when introduction of the refrigerant is permitted by the four-way valve 22.

  The second high-pressure refrigerant pipe 32 has one end connected to the third outlet 224 of the four-way valve 22 and the other end joined to the fourth junction P4 of the refrigerant pipe 26 on the inlet side of the left internal heat exchanger 25c. To do. The second high-pressure refrigerant pipe 32 supplies the high-pressure refrigerant compressed by the compressor 21 to the left-side internal heat exchanger 25c when introduction of the refrigerant is permitted by the four-way valve 22.

  The heat radiation path 40 includes a first heat radiation line 41 and a second heat radiation line 42. The first heat radiation line 41 is branched at a first branch point P5 in the middle of the refrigerant line 26 connected to the outlet side of the internal heat exchanger 25b, and the first outlet 222 of the four-way valve 22 and the external heat The refrigerant pipe 26 is connected to the refrigerant pipe 26 in such a manner that it merges at the fifth junction P6 of the refrigerant pipe 26 with the exchanger 23.

  A third check valve 431, a fourth electronic expansion valve 432, and a fourth capillary tube 433 are provided in the middle of the first heat radiation pipe 41. The fourth electronic expansion valve 432 has its opening degree adjusted in accordance with a command given from the control means 10b, and adiabatically expands the refrigerant that passes therethrough. The fourth capillary tube 433 is for adiabatically expanding the refrigerant that passes therethrough.

  The second heat radiating conduit 42 is branched at a second branch point P7 in the middle of the refrigerant conduit 26 connected to the outlet side of the left-side internal heat exchanger 25c, and the sixth merging point P8 of the first heat radiating conduit 41 is reached. Are connected to the first heat radiating conduit 41 in such a manner that they merge together. A fourth check valve 434 is provided in the middle of the second heat radiation line 42.

  The bypass path 50 includes a bypass pipe line 51 and a bypass valve 52. The bypass pipe 51 branches from a third branch point P9 in the middle of the refrigerant pipe 26 extending from the external heat exchanger 23 to the distributor 271 and is connected to the process pipe 218 of the compressor 21.

  The bypass valve 52 is a valve body that can be opened and closed. When the opening command is given from the control means 10b, the bypass valve 52 opens and allows the refrigerant to pass through the bypass pipe 51, while the control means 10b gives a closing command. Is closed to restrict the refrigerant from passing through the bypass line 51.

  FIG. 6 is a plan view schematically showing the periphery of the compressor 21 in the machine room 9 of the main body cabinet 1. As shown in FIG. 6, a plurality of drain water evaporators 60 (two in the illustrated refrigerant) are provided. The drain water evaporation device 60 is for evaporating drain water generated inside the commodity storage 3 and includes a drain pan 61 and a drain sheet 62.

  The drain pan 61 is for storing drain water generated inside the commodity storage 3. The drain water stored in the drain pan 61 is guided to the drain pan 61 through a gutter member or the like not explicitly shown in the drawing.

  The drain sheet 62 can suck drain water by capillary action. The drain sheet 62 is processed into a square cylinder and is erected on the drain pan 61.

  The drain water evaporator 60 having such a configuration is installed in both the left and right regions of the compressor 21 disposed on the rear side of the external heat exchanger 23. Here, since the compressor 21 is arrange | positioned in the back side of the external heat exchanger 23, the air which passed the external heat exchanger 23 is branched to right and left by the drive of the external ventilation fan F1. is there. Moreover, since the compressor main body 211 has a substantially circular cross-sectional shape as described above, the compressor 21 is coupled with the viscosity of the air passing through and the downsizing of the area through which the air can pass. In both the left and right side areas, the wind speed of the passing air is large. This will be described with reference to FIG.

  FIG. 7 is a chart showing the results of measuring the wind speed of the passing air on the rear side of the external fan F1, that is, the rear side of the external heat exchanger 23, when the external fan F1 is driven.

  In FIG. 7, the change in the wind speed when the compressor 21 is installed on the rear side of the external heat exchanger 23 is indicated by a solid line (A), and the change in the wind speed when the compressor 21 is not installed is indicated by a broken line (RO). ). Note that “0” on the left side of the horizontal axis in FIG. 7 indicates the left end portion of the compressor 21, and “0” on the right side indicates the right end portion of the compressor 21.

  From FIG. 7, it is clear that when the compressor 21 is installed, the wind speed in the left and right side areas of the compressor 21 is larger than when the compressor 21 is not installed. This is because the cross-sectional shape of the compressor main body 211 is substantially circular, and the amount of air passing through the left and right side regions of the compressor 21 is sufficiently secured due to the viscosity of the air. In addition, since the area through which air can pass is reduced by installing the compressor 21, the wind speed of the passing air in both the left and right regions of the compressor 21 is increased.

  In FIG. 7, in the range of 60 mm to the right from the right end of the compressor 21 and in the range of 60 mm to the left from the left end of the compressor 21, the wind speed when the compressor 21 is installed sets the compressor 21. It is much larger than the wind speed when not.

  Therefore, the drain water evaporator 60 disposed in the left side region of the compressor 21 is preferably installed within a range of 60 mm to the left from the left end portion of the compressor 21, and is disposed in the right side region of the compressor 21. It is preferable that the drain water evaporator 60 to be provided is installed within a range of 60 mm to the right from the right end of the compressor 21.

  Next, the case where the refrigerant circuit device 10 cools or heats the product stored in the product storage 3 will be described.

  First, as an example of a single cooling operation, a case where a CCC operation (an operation for cooling the internal air of all the commodity containers 3) is performed will be described.

  In this case, the control means 10b adjusts the four-way valve 22 to the first delivery state, opens the first feedback solenoid valve 277 and the second feedback solenoid valve 278, and closes the bypass valve 52. Further, the control means 10b adjusts the opening degree of the first electronic expansion valve 241, the second electronic expansion valve 242, and the third electronic expansion valve 243 constituting the expansion mechanism 24 to a predetermined size, and the fourth electronic expansion valve. 432 is closed. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  The refrigerant compressed by the piston cylinder part 212 of the compressor 21 is discharged from the discharge pipe 216, passes through the four-way valve 22 in the first delivery state, and reaches the external heat exchanger 23 via the refrigerant pipe 26. .

  The refrigerant that has reached the external heat exchanger 23 dissipates heat to ambient air (outside air) and condenses while passing through the external heat exchanger 23. The refrigerant condensed in the external heat exchanger 23 is branched by the distributor 271 and adiabatically expanded by the expansion mechanism 24 (the first electronic expansion valve 241, the second electronic expansion valve 242, and the third electronic expansion valve 243). It reaches the internal heat exchanger 25, evaporates in each internal heat exchanger 25, takes heat from the internal air of the commodity storage 3, and cools the internal air. The cooled internal air circulates in the interior by driving the internal blower fan F2 disposed in the vicinity of each internal heat exchanger 25, whereby the products accommodated in each commodity storage 3 circulate. Cooled to internal air.

  The refrigerant evaporated in each internal heat exchanger 25 joins at the first joining point P1 and the second joining point P2, and then is sucked into the compressor 21 through the suction pipe 217. The refrigerant sucked into the compressor 21 flows into the compressor main body 211, then flows into the piston cylinder 212 through the suction port 215, and is then compressed to repeat the above-described circulation.

  Next, as an example of the cooling and heating operation, a description will be given of a case where the HHC operation (operation for heating the internal air of the middle warehouse 3b and the left warehouse 3c and cooling the internal air of the right warehouse 3a) is performed.

  In this case, the control means 10b adjusts the four-way valve 22 to the fourth delivery state, and closes the first feedback solenoid valve 277, the second feedback solenoid valve 278, and the bypass valve 52. The control means 10b adjusts the opening degree of the first electronic expansion valve 241 and the fourth electronic expansion valve 432 to a predetermined size while closing the second electronic expansion valve 242 and the third electronic expansion valve 243. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  The refrigerant compressed by the piston cylinder part 212 of the compressor 21 is discharged from the discharge pipe 216 and passes through the first high-pressure refrigerant pipe 31 and the second high-pressure refrigerant pipe 32 via the four-way valve 22 in the fourth delivery state. To do.

  The refrigerant that has passed through the first high-pressure refrigerant pipe 31 reaches the internal heat exchanger 25b. The refrigerant reaching the internal heat exchanger 25b exchanges heat with the internal air of the internal storage 3b while passing through the internal heat exchanger 25b, and dissipates heat to the internal air and condenses. Thereby, the internal air of the internal storage 3b is heated. The heated internal air circulates through the interior of the inner warehouse 3b by driving the internal blower fan F2, whereby the product stored in the inner warehouse 3b is heated to the circulating internal air.

  The refrigerant that has passed through the second high-pressure refrigerant pipe 32 reaches the left-inside heat exchanger 25c. The refrigerant that has reached the left-side internal heat exchanger 25c exchanges heat with the internal air of the left-side 3c while passing through the left-side internal heat exchanger 25c, and dissipates heat to the internal air and condenses. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates in the left warehouse 3c by driving the internal blower fan F2, whereby the product stored in the left warehouse 3c is heated to the circulating internal air.

  The refrigerant condensed in the internal heat exchanger 25b reaches the first heat radiating conduit 41, and the refrigerant condensed in the left internal heat exchanger 25c passes through the second heat radiating conduit 42 to the first heat radiating conduit. 41 and merge together. The merged refrigerant passes through the first heat radiation pipe 41 and is adiabatically expanded by the fourth electronic expansion valve 432 and the fourth capillary tube 433, and then reaches the external heat exchanger 23, and the external heat exchanger 23 To exchange heat with ambient air. The refrigerant that has passed through the external heat exchanger 23 is adiabatically expanded by the first electronic expansion valve 241 via the distributor 271.

  The refrigerant adiabatically expanded by the first electronic expansion valve 241 reaches the right internal heat exchanger 25a, evaporates in the right internal heat exchanger 25a, takes heat from the internal air of the right internal 3a, and removes the internal air. Cooling. The cooled internal air circulates through the inside of the right warehouse 3a by driving the internal blower fan F2, thereby cooling the product accommodated in the right warehouse 3a.

  The refrigerant evaporated in the right internal heat exchanger 25a is sucked into the compressor 21 through the suction pipe 217. The refrigerant sucked into the compressor 21 flows into the compressor main body 211, then flows into the piston cylinder 212 through the suction port 215, and is then compressed to repeat the above-described circulation.

  Here, the HHC operation has been described as an example of the cooling and heating operation. However, in the refrigerant circuit device 10, the CHC operation (heating the internal air of the middle chamber 3b and the internal air of the right chamber 3a and the left chamber 3c is performed. Cooling operation) and HCC operation (operation for heating the internal air of the left warehouse 3c and cooling the internal air of the right warehouse 3a and the central warehouse 3b) can be performed as the cooling heating operation.

  When performing the CHC operation, the control means 10b adjusts the four-way valve 22 to the second delivery state and opens the second feedback solenoid valve 278, while the second electronic expansion valve 242, the first feedback solenoid valve 277, and The bypass valve 52 is closed. The control means 10b adjusts the opening degree of the first electronic expansion valve 241, the third electronic expansion valve 243, and the fourth electronic expansion valve 432 to a predetermined size. Thereby, the refrigerant | coolant compressed with the compressor 21 circulates as follows.

  The refrigerant compressed by the piston cylinder part 212 of the compressor 21 is discharged from the discharge pipe 216 and passes through the first high-pressure refrigerant pipe 31 via the four-way valve 22 in the second delivery state.

  The refrigerant that has passed through the first high-pressure refrigerant pipe 31 reaches the internal heat exchanger 25b. The refrigerant reaching the internal heat exchanger 25b exchanges heat with the internal air of the internal storage 3b while passing through the internal heat exchanger 25b, and dissipates heat to the internal air and condenses. Thereby, the internal air of the internal storage 3b is heated. The heated internal air circulates through the interior of the inner warehouse 3b by driving the internal blower fan F2, whereby the product stored in the inner warehouse 3b is heated to the circulating internal air.

  The refrigerant condensed in the internal heat exchanger 25b reaches the first heat radiating pipe 41, passes through the first heat radiating pipe 41, and is adiabatically expanded by the fourth electronic expansion valve 432 and the fourth capillary tube 433. The external heat exchanger 23 is reached, and the external heat exchanger 23 performs heat exchange with ambient air. The refrigerant that has passed through the external heat exchanger 23 is adiabatically expanded by the first electronic expansion valve 241 and the third electronic expansion valve 243 via the distributor 271.

  The refrigerant adiabatically expanded by the first electronic expansion valve 241 reaches the right internal heat exchanger 25a, evaporates in the right internal heat exchanger 25a, takes heat from the internal air of the right internal 3a, and removes the internal air. Cooling. The cooled internal air circulates through the inside of the right warehouse 3a by driving the internal blower fan F2, thereby cooling the product accommodated in the right warehouse 3a.

  The refrigerant adiabatically expanded by the third electronic expansion valve 243 reaches the left internal heat exchanger 25c, evaporates in the left internal heat exchanger 25c, takes heat from the internal air of the left internal 3c, and removes the internal air. Cooling. The cooled internal air circulates in the left warehouse 3c by driving the internal blower fan F2, thereby cooling the product accommodated in the left warehouse 3c.

  The refrigerant evaporated in the right-side heat exchanger 25a and the left-side heat exchanger 25c joins at the second junction P2, and is then sucked into the compressor 21 through the suction pipe 217. The refrigerant sucked into the compressor 21 flows into the compressor main body 211, then flows into the piston cylinder 212 through the suction port 215, and is then compressed to repeat the above-described circulation.

  When performing the HCC operation, the control means 10b adjusts the four-way valve 22 to the third delivery state and opens the first feedback solenoid valve 277, while the third electronic expansion valve 243, the second feedback solenoid valve 278, and The bypass valve 52 is closed. The control means 10b adjusts the opening degree of the first electronic expansion valve 241, the second electronic expansion valve 242, and the fourth electronic expansion valve 432 to a predetermined size. Thereby, the refrigerant | coolant compressed with the compressor 21 circulates as follows.

  The refrigerant compressed by the piston cylinder part 212 of the compressor 21 is discharged from the discharge pipe 216 and passes through the second high-pressure refrigerant pipe 32 via the four-way valve 22 in the third delivery state.

  The refrigerant that has passed through the second high-pressure refrigerant pipe 32 reaches the left-inside heat exchanger 25c. The refrigerant that has reached the left-side internal heat exchanger 25c exchanges heat with the internal air of the left-side 3c while passing through the left-side internal heat exchanger 25c, and dissipates heat to the internal air and condenses. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates in the left warehouse 3c by driving the internal blower fan F2, whereby the product stored in the left warehouse 3c is heated to the circulating internal air.

  The refrigerant condensed in the left-side heat exchanger 25c reaches the first heat radiation line 41 via the second heat radiation line 42, passes through the first heat radiation line 41, and passes through the fourth electronic expansion valve 432 and the first heat radiation line 41. The four-capillary tube 433 adiabatically expands and then reaches the external heat exchanger 23, and the external heat exchanger 23 performs heat exchange with ambient air. The refrigerant that has passed through the external heat exchanger 23 is adiabatically expanded by the first electronic expansion valve 241 and the second electronic expansion valve 242 via the distributor 271.

  The refrigerant adiabatically expanded by the first electronic expansion valve 241 reaches the right internal heat exchanger 25a, evaporates in the right internal heat exchanger 25a, takes heat from the internal air of the right internal 3a, and removes the internal air. Cooling. The cooled internal air circulates through the inside of the right warehouse 3a by driving the internal blower fan F2, thereby cooling the product accommodated in the right warehouse 3a.

  The refrigerant adiabatically expanded by the second electronic expansion valve 242 reaches the internal heat exchanger 25b, evaporates in the internal heat exchanger 25b, takes heat from the internal air of the internal chamber 3b, and removes the internal air. Cooling. The cooled internal air circulates through the interior of the intermediate store 3b by driving the internal blower fan F2, thereby cooling the product accommodated in the intermediate store 3b.

  The refrigerant evaporated in the right internal heat exchanger 25a and the internal internal heat exchanger 25b joins at the second junction P2, and is then sucked into the compressor 21 through the suction pipe 217. The refrigerant sucked into the compressor 21 flows into the compressor main body 211, then flows into the piston cylinder 212 through the suction port 215, and is then compressed to repeat the above-described circulation.

  Furthermore, the case where the operation | movement which heats the internal air of only the inner store | warehouse | chamber 3b and the left store | warehouse | chamber 3c as an example of heating independent operation is demonstrated.

  In this case, the control means 10b adjusts the four-way valve 22 to the fourth delivery state and opens the bypass valve 52, while the first electronic expansion valve 241, the second electronic expansion valve 242, the third electronic expansion valve 243, The first return solenoid valve 277 and the second return solenoid valve 278 are closed. Further, the control means 10b adjusts the opening degree of the fourth electronic expansion valve 432 to a predetermined size. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  The refrigerant compressed by the piston cylinder part 212 of the compressor 21 is discharged from the discharge pipe 216 and passes through the first high-pressure refrigerant pipe 31 and the second high-pressure refrigerant pipe 32 via the four-way valve 22 in the fourth delivery state. To do.

  The refrigerant that has passed through the first high-pressure refrigerant pipe 31 reaches the internal heat exchanger 25b. The refrigerant reaching the internal heat exchanger 25b exchanges heat with the internal air of the internal storage 3b while passing through the internal heat exchanger 25b, and dissipates heat to the internal air and condenses. Thereby, the internal air of the internal storage 3b is heated. The heated internal air circulates through the interior of the inner warehouse 3b by driving the internal blower fan F2, whereby the product stored in the inner warehouse 3b is heated to the circulating internal air.

  The refrigerant that has passed through the second high-pressure refrigerant pipe 32 reaches the left-inside heat exchanger 25c. The refrigerant that has reached the left-side internal heat exchanger 25c exchanges heat with the internal air of the left-side 3c while passing through the left-side internal heat exchanger 25c, and dissipates heat to the internal air and condenses. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates in the left warehouse 3c by driving the internal blower fan F2, whereby the product stored in the left warehouse 3c is heated to the circulating internal air.

  The refrigerant condensed in the internal heat exchanger 25b reaches the first heat radiating conduit 41, and the refrigerant condensed in the left internal heat exchanger 25c passes through the second heat radiating conduit 42 to the first heat radiating conduit. 41 and merge together. The merged refrigerant passes through the first heat radiation pipe 41 and is adiabatically expanded by the fourth electronic expansion valve 432 and the fourth capillary tube 433, and then reaches the external heat exchanger 23, and the external heat exchanger 23 To exchange heat with ambient air.

  The refrigerant that has passed through the external heat exchanger 23 passes through the bypass pipe 51 and is sucked into the compressor 21 through the process pipe 218. The refrigerant sucked into the compressor 21 flows into the compressor main body 211, then flows into the piston cylinder 212 through the suction port 215, and is then compressed to repeat the above-described circulation.

  Here, since the process pipe 218 is disposed at a location farther from the opening 215a of the suction port 215 than the suction pipe 217, the refrigerant flowing into the compressor body 211 from the process pipe 218 The distance that passes through the inside of the compressor body 211 before flowing into the opening 215a of 215 is the distance that the refrigerant that has flowed into the compressor body 211 from the suction pipe 217 passes through the inside of the compressor body 211. Bigger than. Therefore, the refrigerant passing through the interior of the compressor body 211 through the process pipe 218 is sufficiently heated by the motor 213 and then compressed by the piston cylinder unit 212.

  Here, as an example of the heating single operation, the operation for heating the internal air of only the middle warehouse 3b and the left warehouse 3c has been described. However, in the refrigerant circuit device 10, the operation for heating the internal air of only the middle warehouse 3b, The operation of heating the internal air of only the left warehouse 3c can be performed as a heating single operation.

  When performing the operation of heating the internal air of only the inner warehouse 3b, the control means 10b adjusts the four-way valve 22 to the second delivery state and opens the bypass valve 52, while the first electronic expansion valve 241 and the second electronic The expansion valve 242, the third electronic expansion valve 243, the first feedback solenoid valve 277, and the second feedback solenoid valve 278 are closed. Further, the control means 10b adjusts the opening degree of the fourth electronic expansion valve 432 to a predetermined size. Thereby, the refrigerant | coolant compressed with the compressor 21 circulates as follows.

  The refrigerant compressed by the piston cylinder part 212 of the compressor 21 is discharged from the discharge pipe 216 and passes through the first high-pressure refrigerant pipe 31 via the four-way valve 22 in the second delivery state.

  The refrigerant that has passed through the first high-pressure refrigerant pipe 31 reaches the internal heat exchanger 25b. The refrigerant reaching the internal heat exchanger 25b exchanges heat with the internal air of the internal storage 3b while passing through the internal heat exchanger 25b, and dissipates heat to the internal air and condenses. Thereby, the internal air of the internal storage 3b is heated. The heated internal air circulates through the interior of the inner warehouse 3b by driving the internal blower fan F2, whereby the product stored in the inner warehouse 3b is heated to the circulating internal air.

  The refrigerant condensed in the internal heat exchanger 25b reaches the first heat radiating pipe 41, passes through the first heat radiating pipe 41, and is adiabatically expanded by the fourth electronic expansion valve 432 and the fourth capillary tube 433. The external heat exchanger 23 is reached, and the external heat exchanger 23 performs heat exchange with the ambient air.

  The refrigerant that has passed through the external heat exchanger 23 passes through the bypass pipe 51 and is sucked into the compressor 21 through the process pipe 218. The refrigerant sucked into the compressor 21 flows into the compressor main body 211, then flows into the piston cylinder 212 through the suction port 215, and is then compressed to repeat the above-described circulation.

  Also in this case, since the refrigerant flows into the compressor main body 211 through the process pipe 218, the refrigerant is sufficiently heated by the motor 213.

  When performing the operation of heating the internal air of only the left warehouse 3c, the control means 10b adjusts the four-way valve 22 to the third delivery state and opens the bypass valve 52, while the first electronic expansion valve 241 and the second electronic The expansion valve 242, the third electronic expansion valve 243, the first feedback solenoid valve 277, and the second feedback solenoid valve 278 are closed. Further, the control means 10b adjusts the opening degree of the fourth electronic expansion valve 432 to a predetermined size. Thereby, the refrigerant | coolant compressed with the compressor 21 circulates as follows.

  The refrigerant compressed by the piston cylinder part 212 of the compressor 21 is discharged from the discharge pipe 216 and passes through the second high-pressure refrigerant pipe 32 via the four-way valve 22 in the third delivery state.

  The refrigerant that has passed through the second high-pressure refrigerant pipe 32 reaches the left-inside heat exchanger 25c. The refrigerant that has reached the left-side internal heat exchanger 25c exchanges heat with the internal air of the left-side 3c while passing through the left-side internal heat exchanger 25c, and dissipates heat to the internal air and condenses. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates in the left warehouse 3c by driving the internal blower fan F2, whereby the product stored in the left warehouse 3c is heated to the circulating internal air.

  The refrigerant condensed in the left-side heat exchanger 25c reaches the first heat radiation line 41 via the second heat radiation line 42, passes through the first heat radiation line 41, and passes through the fourth electronic expansion valve 432 and the first heat radiation line 41. The four-capillary tube 433 adiabatically expands and then reaches the external heat exchanger 23, and the external heat exchanger 23 performs heat exchange with ambient air.

  The refrigerant that has passed through the external heat exchanger 23 passes through the bypass pipe 51 and is sucked into the compressor 21 through the process pipe 218. The refrigerant sucked into the compressor 21 flows into the compressor main body 211, then flows into the piston cylinder 212 through the suction port 215, and is then compressed to repeat the above-described circulation.

  Also in this case, since the refrigerant flows into the compressor main body 211 through the process pipe 218, the refrigerant is sufficiently heated by the motor 213.

  As described above, according to the refrigerant circuit device 10, the bypass pipe 51 constituting the bypass path 50 is connected to the process pipe 218, and the control means 10b Since the bypass valve 52 is opened and the refrigerant that has passed through the external heat exchanger 23 passes through the bypass pipe 51, the refrigerant sucked by the compressor 21 is used as a motor 213 that is a drive source of the compressor 21. Thus, the heating capacity can be improved. Therefore, the heating single operation can be favorably performed regardless of the outside air temperature.

  In addition, since the refrigerant can be heated by the motor 213 that is the driving source of the compressor 21 in this way, it is possible to suppress the occurrence of so-called liquid back in which the refrigerant is sucked into the compressor 21 in the liquid phase state, and to reduce the evaporation temperature. The operating efficiency can be improved by increasing the operating efficiency.

  According to the refrigerant circuit device 10, the four-way valve 22 provided in the refrigerant pipe 26 on the discharge side of the compressor 21 is in any of the first delivery state, the second delivery state, the third delivery state, and the fourth delivery state. Since it is a switchable valve, there is no need to provide relief piping or relief valves to prevent excessive pressure on the discharge side of the compressor as in the past, reducing the number of parts. Thus, the manufacturing cost can be reduced.

  According to the vending machine, the compressor 21 has a substantially circular cross-sectional shape and branches the air that has passed through the external heat exchanger 23 to the left and right. The drain water evaporator 60 compresses the air. Since the air is branched by the compressor 21 in both the left and right regions of the machine 21, the drain water evaporator 60 is installed in a region where the wind speed of the passing air becomes sufficiently large. Moreover, there is no need to use an air passage restricting portion or the like as in the past. Therefore, it is possible to evaporate the drain water well while suppressing an increase in manufacturing cost.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various modifications can be made. A modification of the refrigerant circuit device 10 will be described below.

  FIG. 11 is a conceptual diagram conceptually showing a modification of the refrigerant circuit device 10. Note that the refrigerant circuit device 10 illustrated here is also described as being applied to the vending machine shown in FIGS. 1 and 2.

  The refrigerant circuit device 11 illustrated here includes a refrigerant circuit 11a having a main path 70, a high-pressure refrigerant introduction path 80, a heat radiation path 90, and a bypass path 100, and a control unit 11b that appropriately controls each unit provided in the refrigerant circuit 11a. It is configured with.

  The main path 70 is configured by appropriately connecting a compressor 71, a first three-way valve 72, an external heat exchanger 73, an expansion mechanism 74, and an internal heat exchanger 75 through a refrigerant pipe 76. Refrigerant is enclosed.

  The compressor 71 is disposed in the machine room 9. The machine room 9 is a room inside the main body cabinet 1, partitioned from the product storage 3 and below the product storage 3. The compressor 71 sucks the refrigerant through the suction port, compresses the sucked refrigerant, and discharges it into a high-temperature and high-pressure state (high-temperature and high-pressure refrigerant).

  12 and 13 schematically show the configuration of the compressor 71 shown in FIG. 11, respectively. FIG. 12 is a plan view, and FIG. 13 is a side view. As shown in FIGS. 12 and 13, the compressor 71 includes a compressor body 711, a piston cylinder part 712, a motor 713, a discharge port 714, a suction port 715, and a discharge pipe (first pipe). 716, a suction pipe (second pipe) 717, and a process pipe (third pipe) 718.

  The compressor main body 711 is a casing made of thick cast iron and has a substantially circular cross-sectional shape. The piston cylinder part 712 is provided inside the compressor body 711 and compresses the refrigerant. The motor 713 is provided inside the compressor main body 711 and is a drive source that drives a piston constituting the piston cylinder portion 712.

  The discharge port 714 is provided inside the compressor main body 711 and is a refrigerant outflow part for allowing the refrigerant compressed by the piston cylinder part 712 to flow out. The suction port 715 is provided inside the compressor main body 711 and is a refrigerant inflow portion through which refrigerant flows into the piston cylinder portion 712 through an opening 715a communicating with the inside of the compressor main body 711.

  The discharge pipe 716 is directly connected to the piston cylinder part 712 via the discharge port 714 and is disposed in a manner protruding outside the compressor body 711, and discharges the refrigerant compressed by the piston cylinder part 712. belongs to.

  The suction pipe 717 is disposed in a manner protruding outside the compressor body 711 in the vicinity of the opening 715 a of the suction port 715. The suction pipe 717 is for sucking the refrigerant, as will be described in detail later. The refrigerant sucked by the suction pipe 717 once flows into the compressor main body 711 and then flows into the piston cylinder part 712 via the suction port 715.

  The process pipe 718 is disposed so as to protrude from the compressor main body 711 at a location farther from the opening 715 a of the suction port 715 than the suction pipe 717. The process pipe 718 has existed for a long time, and is used for evacuating the inside of the compressor main body 711, filling the refrigerant, drawing the refrigerant, and the like.

  The first three-way valve 72 has one inlet 721 and two outlets (a first outlet 722 and a second outlet 723), and the inlet 721 and the first outlet according to a command given from the control means 11b. The switching valve can be switched between a first delivery state that communicates with the outlet 722 and a second delivery state that communicates between the inlet 721 and the second outlet 723. The inlet 721 of the first three-way valve 72 is connected to a refrigerant pipe 76 connected to the discharge pipe 716 of the compressor 71.

  The external heat exchanger 73 is disposed in the machine room 9 similarly to the compressor 71. This external heat exchanger 73 exchanges heat between the refrigerant that passes through and the ambient air. An outdoor fan F1 is provided in the vicinity of the rear side of the external heat exchanger 73. The refrigerant pipe 76 connected to the inlet side of the external heat exchanger 73 is connected to the first outlet 722 of the first three-way valve 72.

  The expansion mechanism 74 is disposed in the machine room 9 similarly to the compressor 71 and the external heat exchanger 73. The expansion mechanism 74 depressurizes the passing refrigerant and adiabatically expands it, and includes a first electronic expansion valve 741, a second electronic expansion valve 742, and a third electronic expansion valve 743.

  The first electronic expansion valve 741, the second electronic expansion valve 742, and the third electronic expansion valve 743 are divided into three by a distributor 771 connected to a refrigerant pipe 76 connected to the outlet side of the external heat exchanger 73. Are respectively disposed in the refrigerant pipes 76 that are branched.

  Here, the opening degree of each of the first electronic expansion valve 741, the second electronic expansion valve 742, and the third electronic expansion valve 743 constituting the expansion mechanism 74 is adjusted according to a command given from the control means 11b.

  A plurality (three in the illustrated example) of the internal heat exchangers 75 are provided, and are disposed in the lower internal area of each product storage 3 and on the front side of the rear duct D. An internal heat exchanger (hereinafter also referred to as a right internal heat exchanger) 75a disposed in the right chamber 3a is an internal heat disposed in the intermediate chamber 3b on the downstream side of the first electronic expansion valve 741. An exchanger (hereinafter also referred to as an internal heat exchanger) 75b is an internal heat exchanger (hereinafter, left internal heat) disposed in the left chamber 3c on the downstream side of the second electronic expansion valve 742. 75c (also referred to as an exchanger) is connected to the refrigerant line 76 in a manner located on the downstream side of the third electronic expansion valve 743.

  Also, between the first electronic expansion valve 741 and the right internal heat exchanger 75a, between the second electronic expansion valve 742 and the internal heat exchanger 75b, and between the third electronic expansion valve 743 and the left internal heat. A first capillary tube 772, a second capillary tube 773, and a third capillary tube 774 are provided between the exchanger 75c.

  Further, a first check valve 775 is provided between the second electronic expansion valve 742 and the second capillary tube 773, and a second check valve is provided between the third electronic expansion valve 743 and the third capillary tube 774. A valve 776 is provided.

  The refrigerant line 76 connected to the outlet side of the inner-compartment heat exchanger 75b and the left-inside heat exchanger 75c merges at the first junction Q1, and the merged refrigerant line 76 further includes the right-house internal heat. The refrigerant 75 is joined to the outlet 75a of the exchanger 75a at the second junction Q2. The refrigerant pipe 76 joined at the second junction Q2 is connected to the suction pipe 717 of the compressor 71.

  In the refrigerant pipe 76 connected to the outlet side of the internal heat exchanger 75b, a first return solenoid valve 777 is disposed on the upstream side of the first junction Q1. The first feedback solenoid valve 777 is a valve body that can be opened and closed. When the opening command is given from the control means 11b, the first feedback solenoid valve 777 opens and allows passage of the refrigerant, whereas when the closing command is given. It closes and regulates the passage of refrigerant.

  In the refrigerant line 76 connected to the outlet side of the left-side heat exchanger 75c, a second return electromagnetic valve 778 is disposed on the upstream side of the first junction Q1. The second feedback solenoid valve 778 is a valve body that can be opened and closed. When the opening command is given from the control means 11b, the second feedback solenoid valve 778 opens and permits the passage of the refrigerant, while when the closing command is given. It closes and regulates the passage of refrigerant.

  The high-pressure refrigerant introduction path 80 includes a high-pressure refrigerant introduction line 81, a second three-way valve 82, a first high-pressure refrigerant line 83, a second high-pressure refrigerant line 84, and a high-pressure refrigerant Pibus line 85.

  One end of the high-pressure refrigerant introduction pipe 81 is connected to the second outlet 723 of the first three-way valve 72 and the other end is connected to the inlet 821 of the second three-way valve 82.

  The second three-way valve 82 has one inlet 821 and two outlets (a first outlet 822 and a second outlet 823), and the inlet 821 and the first outlet according to a command given from the control means 11b. The switching valve can be switched between a first delivery state in which the outlet 822 is communicated and a second delivery state in which the inlet 821 and the second outlet 823 are communicated.

  One end of the first high-pressure refrigerant pipe 83 is connected to the first outlet 822 of the second three-way valve 82, and the other end is the third junction Q3 of the refrigerant pipe 76 on the inlet side of the internal heat exchanger 75b. To join. The first high-pressure refrigerant line 83 supplies the high-pressure refrigerant compressed by the compressor 71 to the internal heat exchanger 75b.

  One end of the second high-pressure refrigerant pipe 84 is connected to the second outlet 823 of the second three-way valve 82, and the other end is the fourth junction point Q4 of the refrigerant pipe 76 on the inlet side of the left internal heat exchanger 75c. To join. The second high-pressure refrigerant pipe 84 supplies the high-pressure refrigerant compressed by the compressor 71 to the left-inside heat exchanger 75c.

  The high-pressure refrigerant bypass pipe 85 is provided in such a manner that it branches off from the first branch point Q 5 in the middle of the high-pressure refrigerant introduction pipe 81 and joins the fifth junction Q 6 of the second high-pressure refrigerant pipe 84. A high-pressure refrigerant bypass valve 86 is disposed in the high-pressure refrigerant bypass pipe 85.

  The high-pressure refrigerant bypass valve 86 is a valve body that can be opened and closed. When the opening command is given from the control means 11b, the high-pressure refrigerant bypass valve 86 opens and allows the refrigerant to pass through the high-pressure refrigerant bypass pipe 85, while the control means When a close command is given from 11b, it closes and it restrict | limits that a refrigerant | coolant passes the high pressure refrigerant | coolant bypass conduit 85. FIG.

  The heat radiation path 90 includes a first heat radiation pipe line 91 and a second heat radiation pipe line 92. The first heat radiation pipe 91 is branched at a second branch point Q7 in the middle of the refrigerant pipe 76 connected to the outlet side of the internal heat exchanger 75b, and the first outlet 722 of the first three-way valve 72 and the warehouse. The refrigerant pipe 76 is connected to the refrigerant pipe 76 in such a manner that the refrigerant pipe 76 merges with the external heat exchanger 73 at a sixth junction Q8.

  A third check valve 931, a fourth electronic expansion valve 932, and a fourth capillary tube 933 are provided in the middle of the first heat radiation conduit 91. The fourth electronic expansion valve 932 has its opening degree adjusted in accordance with a command given from the control means 11b, and adiabatically expands the refrigerant passing therethrough. The fourth capillary tube 933 is for adiabatic expansion of the refrigerant passing therethrough.

  The second radiating conduit 92 is branched at a third branching point Q9 in the middle of the refrigerant conduit 76 connected to the outlet side of the left-side heat exchanger 75c, and the seventh merging point Q10 of the first radiating conduit 91 is. Are connected to the first heat radiating conduit 91 in such a manner that they merge together. A fourth check valve 934 is provided in the middle of the second heat radiating conduit 92.

  The bypass path 100 includes a bypass pipe line 101 and a bypass valve 102. The bypass pipe 101 branches from a fourth branch point Q11 in the middle of the refrigerant pipe 76 extending from the external heat exchanger 73 to the distributor 771, and is connected to the process pipe 718 of the compressor 71.

  The bypass valve 102 is a valve body that can be opened and closed. When the opening command is given from the control means 11b, the bypass valve 102 opens and allows the refrigerant to pass through the bypass conduit 101, while the control means 11b gives a closing command. Is closed to restrict the refrigerant from passing through the bypass conduit 101.

  Such a refrigerant circuit device 11 cools or heats the product stored in the product storage 3 as follows.

  First, as an example of a single cooling operation, a case where a CCC operation (an operation for cooling the internal air of all the commodity containers 3) is described.

  In this case, the control means 11b adjusts the first three-way valve 72 to the first delivery state. The control unit 11b opens the first feedback solenoid valve 777 and the second feedback solenoid valve 778, and closes the bypass valve 102. Furthermore, the control means 11b adjusts the opening degree of the first electronic expansion valve 741, the second electronic expansion valve 742, and the third electronic expansion valve 743 constituting the expansion mechanism 74 to a predetermined size, and the fourth electronic expansion valve. 932 is closed. As a result, the refrigerant compressed by the compressor 71 circulates as shown in FIG.

  The refrigerant compressed by the piston cylinder part 712 of the compressor 71 is discharged from the discharge pipe 716, passes through the first three-way valve 72 in the first delivery state, passes through the refrigerant pipe 76, and the external heat exchanger 73. To. The refrigerant that reaches the external heat exchanger 73 dissipates heat to ambient air (outside air) and condenses while passing through the external heat exchanger 73.

  The refrigerant condensed in the external heat exchanger 73 is branched by the distributor 771, and adiabatically expanded by the expansion mechanism 74 (the first electronic expansion valve 741, the second electronic expansion valve 742, and the third electronic expansion valve 743). It reaches the internal heat exchanger 75, evaporates in each internal heat exchanger 75, takes heat from the internal air of the commodity storage 3, and cools the internal air. The cooled internal air circulates in the interior by driving the internal blower fan F2 disposed in the vicinity of each internal heat exchanger 75, whereby the products accommodated in each commodity storage 3 circulate. Cooled to internal air.

  The refrigerant evaporated in each internal heat exchanger 75 joins at the first joining point Q1 and the second joining point Q2, and then is sucked into the compressor 71 through the suction pipe 717. The refrigerant sucked into the compressor 71 flows into the compressor main body 711, then flows into the piston cylinder part 712 via the suction port 715, is compressed thereafter, and repeats the circulation described above.

  Next, as an example of the cooling and heating operation, a description will be given of a case where the HHC operation (operation for heating the internal air of the middle warehouse 3b and the left warehouse 3c and cooling the internal air of the right warehouse 3a) is performed.

  In this case, the control means 11b adjusts the first three-way valve 72 to the second delivery state and adjusts the second three-way valve 82 to the first delivery state. The control unit 11b opens the high-pressure refrigerant bypass valve 86, and closes the first feedback solenoid valve 777, the second feedback solenoid valve 778, and the bypass valve 102. Further, the control means 11b adjusts the opening degree of the first electronic expansion valve 741 and the fourth electronic expansion valve 932 to a predetermined size while closing the second electronic expansion valve 742 and the third electronic expansion valve 743. As a result, the refrigerant compressed by the compressor 71 circulates as shown in FIG.

  The refrigerant compressed by the piston cylinder part 712 of the compressor 71 is discharged from the discharge pipe 716 and passes through the high-pressure refrigerant introduction conduit 81 via the first three-way valve 72 in the second delivery state.

  The refrigerant that has passed through the high-pressure refrigerant introduction pipe 81 passes through the first high-pressure refrigerant pipe 83 via the second three-way valve 82 in the first delivery state, and the second high-pressure refrigerant through the high-pressure refrigerant bypass pipe 85. Pass through line 84.

  The refrigerant that has passed through the first high-pressure refrigerant pipe 83 reaches the internal heat exchanger 75b. The refrigerant that has reached the internal heat exchanger 75b exchanges heat with the internal air of the internal storage 3b while passing through the internal heat exchanger 75b, dissipates heat to the internal air, and condenses. Thereby, the internal air of the internal storage 3b is heated. The heated internal air circulates through the interior of the inner warehouse 3b by driving the internal blower fan F2, whereby the product stored in the inner warehouse 3b is heated to the circulating internal air.

  The refrigerant that has passed through the second high-pressure refrigerant pipe 84 reaches the left-inside heat exchanger 75c. The refrigerant that has reached the left-side internal heat exchanger 75c exchanges heat with the internal air of the left-side 3c while passing through the left-side internal heat exchanger 75c, and dissipates heat to the internal air and condenses. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates in the left warehouse 3c by driving the internal blower fan F2, whereby the product stored in the left warehouse 3c is heated to the circulating internal air.

  The refrigerant condensed in the internal heat exchanger 75b reaches the first heat radiating conduit 91, and the refrigerant condensed in the left internal heat exchanger 75c passes through the second heat radiating conduit 92 to the first heat radiating conduit. 91 to join each other. The merged refrigerant passes through the first heat radiating conduit 91 and is adiabatically expanded by the fourth electronic expansion valve 932 and the fourth capillary tube 933, and then reaches the external heat exchanger 73, and the external heat exchanger 73. To exchange heat with ambient air. The refrigerant that has passed through the external heat exchanger 73 is adiabatically expanded by the first electronic expansion valve 741 via the distributor 771.

  The refrigerant adiabatically expanded by the first electronic expansion valve 741 reaches the right internal heat exchanger 75a, evaporates in the right internal heat exchanger 75a, takes heat from the internal air of the right internal 3a, and removes the internal air. Cooling. The cooled internal air circulates through the inside of the right warehouse 3a by driving the internal blower fan F2, thereby cooling the product accommodated in the right warehouse 3a.

  The refrigerant evaporated in the right-side heat exchanger 75a is sucked into the compressor 71 through the suction pipe 717. The refrigerant sucked into the compressor 71 flows into the compressor main body 711, then flows into the piston cylinder part 712 via the suction port 715, is compressed thereafter, and repeats the circulation described above.

  Here, the HHC operation is described as an example of the cooling and heating operation. However, in the refrigerant circuit device 11, the CHC operation (heating the internal air of the middle chamber 3b and the internal air of the right chamber 3a and the left chamber 3c is performed. Cooling operation) and HCC operation (operation for heating the internal air of the left warehouse 3c and cooling the internal air of the right warehouse 3a and the central warehouse 3b) can be performed as the cooling heating operation.

  When performing the CHC operation, the control unit 11b adjusts the first three-way valve 72 to the second delivery state and adjusts the second three-way valve 82 to the first delivery state. The control means 11b opens the second feedback electromagnetic valve 778, and closes the second electronic expansion valve 742, the first feedback electromagnetic valve 777, the high-pressure refrigerant bypass valve 86, and the bypass valve 102. Furthermore, the control means 11b adjusts the opening degree of the first electronic expansion valve 741, the third electronic expansion valve 743, and the fourth electronic expansion valve 932 to a predetermined size. Thereby, the refrigerant | coolant compressed with the compressor 71 circulates as follows.

  The refrigerant compressed by the piston cylinder part 712 of the compressor 71 is discharged from the discharge pipe 716 and passes through the high-pressure refrigerant introduction conduit 81 via the first three-way valve 72 in the second delivery state. The refrigerant that has passed through the high-pressure refrigerant introduction pipe 81 passes through the first high-pressure refrigerant pipe 83 via the second three-way valve 82 in the first delivery state.

  The refrigerant that has passed through the first high-pressure refrigerant pipe 83 reaches the internal heat exchanger 75b. The refrigerant that has reached the internal heat exchanger 75b exchanges heat with the internal air of the internal storage 3b while passing through the internal heat exchanger 75b, dissipates heat to the internal air, and condenses. Thereby, the internal air of the internal storage 3b is heated. The heated internal air circulates through the interior of the inner warehouse 3b by driving the internal blower fan F2, whereby the product stored in the inner warehouse 3b is heated to the circulating internal air.

  The refrigerant condensed in the internal heat exchanger 75b reaches the first heat radiating conduit 91, passes through the first heat radiating conduit 91, and adiabatically expands in the fourth electronic expansion valve 932 and the fourth capillary tube 933, and thereafter. The external heat exchanger 73 is reached, and the external heat exchanger 73 exchanges heat with ambient air. The refrigerant that has passed through the external heat exchanger 73 is adiabatically expanded by the first electronic expansion valve 741 and the third electronic expansion valve 743 via the distributor 771.

  The refrigerant adiabatically expanded by the first electronic expansion valve 741 reaches the right internal heat exchanger 75a, evaporates in the right internal heat exchanger 75a, takes heat from the internal air of the right internal 3a, and removes the internal air. Cooling. The cooled internal air circulates through the inside of the right warehouse 3a by driving the internal blower fan F2, thereby cooling the product accommodated in the right warehouse 3a.

  The refrigerant adiabatically expanded by the third electronic expansion valve 743 reaches the left internal heat exchanger 75c, evaporates in the left internal heat exchanger 75c, takes heat from the internal air of the left internal 3c, and removes the internal air. Cooling. The cooled internal air circulates in the left warehouse 3c by driving the internal blower fan F2, thereby cooling the product accommodated in the left warehouse 3c.

  The refrigerant evaporated in the right-side heat exchanger 75a and the left-side heat exchanger 75c joins at the second junction Q2, and is then sucked into the compressor 71 through the suction pipe 717. The refrigerant sucked into the compressor 71 flows into the compressor main body 711, then flows into the piston cylinder part 712 via the suction port 715, is compressed thereafter, and repeats the circulation described above.

  When performing the HCC operation, the control unit 11b adjusts the first three-way valve 72 to the second delivery state and adjusts the second three-way valve 82 to the second delivery state. The control unit 11b opens the first feedback solenoid valve 777, and closes the third electronic expansion valve 743, the second feedback solenoid valve 778, the high-pressure refrigerant bypass valve 86, and the bypass valve 102. Furthermore, the control means 11b adjusts the opening degree of the first electronic expansion valve 741, the second electronic expansion valve 742, and the fourth electronic expansion valve 932 to a predetermined size. Thereby, the refrigerant | coolant compressed with the compressor 71 circulates as follows.

  The refrigerant compressed by the piston cylinder part 712 of the compressor 71 is discharged from the discharge pipe 716 and passes through the high-pressure refrigerant introduction conduit 81 via the first three-way valve 72 in the second delivery state. The refrigerant that has passed through the high-pressure refrigerant introduction pipe 81 passes through the second high-pressure refrigerant pipe 84 via the second three-way valve 82 in the second delivery state.

  The refrigerant that has passed through the second high-pressure refrigerant pipe 84 reaches the left-inside heat exchanger 75c. The refrigerant that has reached the left-side internal heat exchanger 75c exchanges heat with the internal air of the left-side 3c while passing through the left-side internal heat exchanger 75c, and dissipates heat to the internal air and condenses. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates in the left warehouse 3c by driving the internal blower fan F2, whereby the product stored in the left warehouse 3c is heated to the circulating internal air.

  The refrigerant condensed in the left-side heat exchanger 75c reaches the first heat radiating conduit 91 via the second heat radiating conduit 92, passes through the first heat radiating conduit 91, and the fourth electronic expansion valve 932 and the second electronic expansion valve 932. The four-capillary tube 933 performs adiabatic expansion, and then reaches the external heat exchanger 73, and the external heat exchanger 73 performs heat exchange with ambient air. The refrigerant that has passed through the external heat exchanger 73 is adiabatically expanded by the first electronic expansion valve 741 and the second electronic expansion valve 742 via the distributor 771.

  The refrigerant adiabatically expanded by the first electronic expansion valve 741 reaches the right internal heat exchanger 75a, evaporates in the right internal heat exchanger 75a, takes heat from the internal air of the right internal 3a, and removes the internal air. Cooling. The cooled internal air circulates through the inside of the right warehouse 3a by driving the internal blower fan F2, thereby cooling the product accommodated in the right warehouse 3a.

  The refrigerant adiabatically expanded by the second electronic expansion valve 742 reaches the internal heat exchanger 75b, evaporates in the internal heat exchanger 75b, takes heat from the internal air of the internal chamber 3b, and removes the internal air. Cooling. The cooled internal air circulates through the interior of the intermediate store 3b by driving the internal blower fan F2, thereby cooling the product accommodated in the intermediate store 3b.

  The refrigerant evaporated in the right internal heat exchanger 75a and the internal internal heat exchanger 75b joins at the second junction Q2, and is then sucked into the compressor 71 through the suction pipe 717. The refrigerant sucked into the compressor 71 flows into the compressor main body 711, then flows into the piston cylinder part 712 via the suction port 715, is compressed thereafter, and repeats the circulation described above.

  Furthermore, the case where the operation | movement which heats the internal air of only the inner warehouse 3b and the left warehouse 3c is performed as an example of heating independent operation is demonstrated.

  In this case, the control means 11b adjusts the first three-way valve 72 to the second delivery state and adjusts the second three-way valve 82 to the first delivery state. The control unit 11b opens the high-pressure refrigerant bypass valve 86 and the bypass valve 102, while the first electronic expansion valve 741, the second electronic expansion valve 742, the third electronic expansion valve 743, the first feedback electromagnetic valve 777, and the first 2 The electromagnetic valve 778 for return is closed. Furthermore, the control means 11b adjusts the opening degree of the fourth electronic expansion valve 932 to a predetermined size. As a result, the refrigerant compressed by the compressor 71 circulates as shown in FIG.

  The refrigerant compressed by the piston cylinder part 712 of the compressor 71 is discharged from the discharge pipe 716 and passes through the high-pressure refrigerant introduction conduit 81 via the first three-way valve 72 in the second delivery state. The refrigerant that has passed through the high-pressure refrigerant introduction pipe 81 passes through the first high-pressure refrigerant pipe 83 via the second three-way valve 82 in the first delivery state, and the second high-pressure refrigerant through the high-pressure refrigerant bypass pipe 85. Pass through line 84.

  The refrigerant that has passed through the first high-pressure refrigerant pipe 83 reaches the internal heat exchanger 75b. The refrigerant that has reached the internal heat exchanger 75b exchanges heat with the internal air of the internal storage 3b while passing through the internal heat exchanger 75b, dissipates heat to the internal air, and condenses. Thereby, the internal air of the internal storage 3b is heated. The heated internal air circulates through the interior of the inner warehouse 3b by driving the internal blower fan F2, whereby the product stored in the inner warehouse 3b is heated to the circulating internal air.

  The refrigerant that has passed through the second high-pressure refrigerant pipe 84 reaches the left-inside heat exchanger 75c. The refrigerant that has reached the left-side internal heat exchanger 75c exchanges heat with the internal air of the left-side 3c while passing through the left-side internal heat exchanger 75c, and dissipates heat to the internal air and condenses. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates in the left warehouse 3c by driving the internal blower fan F2, whereby the product stored in the left warehouse 3c is heated to the circulating internal air.

  The refrigerant condensed in the internal heat exchanger 75b reaches the first heat radiating conduit 91, and the refrigerant condensed in the left internal heat exchanger 75c passes through the second heat radiating conduit 92 to the first heat radiating conduit. 91 to join each other. The merged refrigerant passes through the first heat radiating conduit 91 and is adiabatically expanded by the fourth electronic expansion valve 932 and the fourth capillary tube 933, and then reaches the external heat exchanger 73, and the external heat exchanger 73. To exchange heat with ambient air.

  The refrigerant that has passed through the external heat exchanger 73 passes through the bypass pipe 101 and is sucked into the compressor 71 through the process pipe 718. The refrigerant sucked into the compressor 71 flows into the compressor main body 711, then flows into the piston cylinder part 712 via the suction port 715, is compressed thereafter, and repeats the circulation described above.

  Here, since the process pipe 718 is disposed at a position farther from the opening 715a of the suction port 715 than the suction pipe 717, the refrigerant flowing into the compressor body 711 from the process pipe 718 The distance that passes through the inside of the compressor body 711 before flowing into the opening 715a of 715 is the distance that the refrigerant that has flowed into the inside of the compressor body 711 from the suction pipe 717 passes through the inside of the compressor body 711. Bigger than. Therefore, the refrigerant passing through the inside of the compressor body 711 through the process pipe 718 is sufficiently heated by the motor 713 and then compressed by the piston cylinder part 712.

  Here, as an example of the heating single operation, the operation for heating the internal air of only the middle warehouse 3b and the left warehouse 3c has been described. The operation of heating the internal air of only the left warehouse 3c can be performed as a heating single operation.

  When performing an operation of heating the internal air of only the inner warehouse 3b, the control unit 11b adjusts the first three-way valve 72 to the second delivery state and adjusts the second three-way valve 82 to the first delivery state. The control unit 11b opens the bypass valve 102, while the first electronic expansion valve 741, the second electronic expansion valve 742, the third electronic expansion valve 743, the first feedback solenoid valve 777, and the second feedback solenoid valve 778. And the high-pressure refrigerant bypass valve 86 is closed. Furthermore, the control means 11b adjusts the opening degree of the fourth electronic expansion valve 932 to a predetermined size. Thereby, the refrigerant | coolant compressed with the compressor 71 circulates as follows.

  The refrigerant compressed by the piston cylinder part 712 of the compressor 71 is discharged from the discharge pipe 716 and passes through the high-pressure refrigerant introduction conduit 81 via the first three-way valve 72 in the second delivery state. The refrigerant that has passed through the high-pressure refrigerant introduction pipe 81 passes through the first high-pressure refrigerant pipe 83 via the second three-way valve 82 in the first delivery state.

  The refrigerant that has passed through the first high-pressure refrigerant pipe 83 reaches the internal heat exchanger 75b. The refrigerant that has reached the internal heat exchanger 75b exchanges heat with the internal air of the internal storage 3b while passing through the internal heat exchanger 75b, dissipates heat to the internal air, and condenses. Thereby, the internal air of the internal storage 3b is heated. The heated internal air circulates through the interior of the inner warehouse 3b by driving the internal blower fan F2, whereby the product stored in the inner warehouse 3b is heated to the circulating internal air.

  The refrigerant condensed in the internal heat exchanger 75b reaches the first heat radiating conduit 91, passes through the first heat radiating conduit 91, and adiabatically expands in the fourth electronic expansion valve 932 and the fourth capillary tube 933, and thereafter. The external heat exchanger 73 is reached, and the external heat exchanger 73 exchanges heat with ambient air.

  The refrigerant that has passed through the external heat exchanger 73 passes through the bypass pipe 101 and is sucked into the compressor 71 through the process pipe 718. The refrigerant sucked into the compressor 71 flows into the compressor main body 711, then flows into the piston cylinder part 712 via the suction port 715, is compressed thereafter, and repeats the circulation described above. Also in this case, since the refrigerant flows into the compressor main body 711 through the process pipe 718, the refrigerant is sufficiently heated by the motor 713.

  When the operation of heating the internal air of only the left chamber 3c is performed, the control unit 11b adjusts the first three-way valve 72 to the second delivery state and adjusts the second three-way valve 82 to the second delivery state. The control unit 11b opens the bypass valve 102, while the first electronic expansion valve 741, the second electronic expansion valve 742, the third electronic expansion valve 743, the first feedback solenoid valve 777, and the second feedback solenoid valve 778. And the high-pressure refrigerant bypass valve 86 is closed. Furthermore, the control means 11b adjusts the opening degree of the fourth electronic expansion valve 932 to a predetermined size. Thereby, the refrigerant | coolant compressed with the compressor 71 circulates as follows.

  The refrigerant compressed by the piston cylinder part 712 of the compressor 71 is discharged from the discharge pipe 716 and passes through the high-pressure refrigerant introduction conduit 81 via the first three-way valve 72 in the second delivery state. The refrigerant that has passed through the high-pressure refrigerant introduction pipe 81 passes through the second high-pressure refrigerant pipe 84 via the second three-way valve 82 in the second delivery state.

  The refrigerant that has passed through the second high-pressure refrigerant pipe 84 reaches the left-inside heat exchanger 75c. The refrigerant that has reached the left-side internal heat exchanger 75c exchanges heat with the internal air of the left-side 3c while passing through the left-side internal heat exchanger 75c, and dissipates heat to the internal air and condenses. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates in the left warehouse 3c by driving the internal blower fan F2, whereby the product stored in the left warehouse 3c is heated to the circulating internal air.

  The refrigerant condensed in the left-side heat exchanger 75c reaches the first heat radiating conduit 91 via the second heat radiating conduit 92, passes through the first heat radiating conduit 91, and the fourth electronic expansion valve 932 and the second electronic expansion valve 932. The four-capillary tube 933 performs adiabatic expansion, and then reaches the external heat exchanger 73, and the external heat exchanger 73 performs heat exchange with ambient air.

  The refrigerant that has passed through the external heat exchanger 73 passes through the bypass pipe 101 and is sucked into the compressor 71 through the process pipe 718. The refrigerant sucked into the compressor 71 flows into the compressor main body 711, then flows into the piston cylinder part 712 via the suction port 715, is compressed thereafter, and repeats the circulation described above. Also in this case, since the refrigerant flows into the compressor main body 711 through the process pipe 718, the refrigerant is sufficiently heated by the motor 713.

  As described above, according to the refrigerant circuit device 11, the bypass pipe line 101 constituting the bypass path 100 is connected to the process pipe 718, and the control unit 11b Since the refrigerant that has opened the bypass valve 102 and passed through the external heat exchanger 73 passes through the bypass pipe 101, the refrigerant sucked by the compressor 71 is heated by the motor 713 that is the drive source of the compressor 71. Thus, the heating capacity can be improved. Therefore, the heating single operation can be favorably performed regardless of the outside air temperature.

  In addition, since the refrigerant can be heated by the motor 713 that is the driving source of the compressor 71 in this way, it is possible to suppress the occurrence of so-called liquid back in which the refrigerant is sucked into the compressor 71 in the liquid phase state, and to reduce the evaporation temperature. The operating efficiency can be improved by increasing the operating efficiency.

  According to the refrigerant circuit device 11, the first three-way valve 72 provided in the refrigerant pipe 76 on the discharge side of the compressor 71 is a switching valve that can be switched between the first delivery state and the second delivery state. Therefore, there is no need to provide relief piping or relief valves to prevent the pressure on the discharge side of the compressor from becoming excessive as in the prior art, and the number of parts is reduced to reduce manufacturing costs. be able to.

DESCRIPTION OF SYMBOLS 10 Refrigerant circuit apparatus 10a Refrigerant circuit 10b Control means 20 Main path 21 Compressor 211 Compressor main body 212 Piston cylinder part 213 Motor 216 Discharge pipe 217 Suction pipe 218 Process pipe 22 Four-way valve 23 External heat exchanger 24 Expansion mechanism 25 In-chamber Heat exchanger 26 Refrigerant line 30 High-pressure refrigerant introduction path 31 First high-pressure refrigerant line 32 Second high-pressure refrigerant line 40 Heat radiation path 41 First heat radiation line 42 Second heat radiation line 50 Bypass path 51 Bypass line 52 Bypass Valve 60 Drain water evaporation device 61 Drain pan 62 Drain sheet F1 Outside fan F2 Inside fan

Claims (3)

An internal heat exchanger disposed inside the chamber, a compressor that sucks and compresses the refrigerant that has passed through the internal heat exchanger, and an external heat exchanger disposed outside the chamber, A main path configured by sequentially connecting an expansion mechanism that adiabatically expands the refrigerant that has passed through the external heat exchanger through a refrigerant line;
When introduction of the refrigerant is permitted by a switching valve provided in the refrigerant pipe on the discharge side of the compressor, the refrigerant compressed by the compressor is transferred to the chamber to be heated in the internal heat exchanger. A high-pressure refrigerant introduction path for supplying to the heat exchanger in the heating chamber,
A refrigerant circuit comprising: a heat dissipation path that supplies the refrigerant that has passed through the heat exchanger in the heating chamber to the upstream side of the external heat exchanger in the main path;
The compressor includes a piston cylinder portion that is disposed inside the compressor body and that compresses the refrigerant that has flowed in through an opening communicating with the internal space of the compressor body, and the piston cylinder outside the compressor body. A first pipe that is arranged in a state of being directly connected to the section and that is compressed by the piston cylinder section to the refrigerant pipe on the discharge side, and the interior of the compressor body outside the compressor body A second pipe disposed in a manner communicating with the space and connected to a refrigerant pipe for sucking the refrigerant that has passed through the internal heat exchanger, and the compressor main body outside the compressor main body. In a refrigerant circuit device comprising a third pipe that communicates with an internal space and that is disposed in a manner separated from the opening rather than the second pipe,
A bypass line separated from a refrigerant line connected to the outlet side of the external heat exchanger and connected to the third pipe;
When opened and opened in the bypass pipeline, the refrigerant is allowed to pass through the bypass pipeline, while when closed, the refrigerant is restricted from passing through the bypass pipeline. A bypass valve;
When performing a single heating operation that heats only the internal air of the chamber in which the heat exchanger in the heating chamber is disposed, the refrigerant compressed by the compressor by adjusting the delivery state of the switching valve is the high pressure And a control means for opening the bypass valve and allowing the refrigerant that has passed through the external heat exchanger to pass through the bypass pipe, while being introduced into the refrigerant introduction path. Refrigerant circuit device.   When the control means performs a cooling heating operation for heating the internal air of the chamber in which the heat exchanger in the heating chamber is disposed and cooling the internal air of the chamber in which the other internal heat exchanger is disposed. The adjustment of the delivery state of the switching valve so that the refrigerant compressed by the compressor is introduced into the high-pressure refrigerant introduction path, and the bypass valve is closed so that the external heat exchanger The refrigerant circuit device according to claim 1, wherein the refrigerant that has passed through is adiabatically expanded by the expansion mechanism and is sent to the internal heat exchanger.   When the control means performs a single cooling operation for cooling only the internal air in any of the chambers, the refrigerant compressed by the compressor by adjusting the delivery state of the switching valve is transferred to the external heat exchanger And the refrigerant passing through the external heat exchanger is adiabatically expanded by the expansion mechanism and sent to the internal heat exchanger. The refrigerant circuit device according to claim 1 or 2.

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