JP2017059093A - Refrigerant circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant circuit device capable of achieving energy saving by performing efficient operation by maximizing operation ratio of a multiple chamber heat pump operation and by lowering operation ratio of a compressor.SOLUTION: A control part performs control in such a manner that, even when the inside temperature of a left chamber 3c measured by a left chamber inside temperature sensor has reached heating start temperature first, a control part waits heating start of the left chamber 3c until the inside temperature of a middle chamber 3b measured by a middle chamber inside temperature sensor reaches the heating start temperature, and when the inside temperature of the middle chamber 3b which did not reach the heating start temperature has reached the heating start temperature, it drives a compressor and starts heating of the middle chamber 3b and the left chamber 3c simultaneously.SELECTED DRAWING: Figure 7

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.

  2. Description of the Related Art Conventionally, a refrigerant circuit device including a refrigerant circuit having a heat pump function has been known that includes a refrigerant circuit having a main path, a high-pressure refrigerant introduction path, a heat dissipation path, and a return path.

  The main path is configured in an annular shape by sequentially connecting an internal heat exchanger, a compressor, an external heat exchanger, and an expansion mechanism through a 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 heats the refrigerant by exchanging heat between the refrigerant compressed by the compressor and the ambient air. The expansion mechanism depressurizes the refrigerant radiated by the external heat exchanger and adiabatically expands it.

  In such a main path, the refrigerant compressed by the compressor dissipates heat in the external heat exchanger, and the dissipated refrigerant is adiabatically expanded by the expansion mechanism, and exchanges heat with the internal air of the room by the internal heat exchanger. Evaporate. 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. The heat is dissipated in the refrigerant. Thereby, the internal air of the chamber in which the internal heat exchanger is disposed is heated.

  The heat dissipation path is for introducing the refrigerant radiated by the internal heat exchanger and supplying it to the gas cooler. Thereby, in the gas cooler, the refrigerant passing through exchanges heat with the surrounding air.

  The return path introduces the refrigerant that has passed through the gas cooler and returns it to the upstream side of the expansion mechanism of the main path. As a result, the refrigerant that has passed through the return path reaches the main path, and is then adiabatically expanded by the expansion mechanism and delivered to the internal heat exchanger.

  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 the internal air of one of the chambers is heated to cool the internal air of the other chamber (when cooling and heating operation is performed), the high pressure corresponding to the internal heat exchanger of the chamber to be heated Open the solenoid valve of the refrigerant introduction path, supply high-pressure refrigerant to the internal heat exchanger to dissipate heat, and then return to the main path via the heat dissipation path and return path, and inside the chamber to be cooled What is necessary is just to circulate so that it may send out to a heat exchanger (for example, refer patent document 1).

JP 2010-169361 A (FIGS. 5 and 6)

  And when performing HHC operation (operation which heats the internal air of a center store | warehouse | chamber and left store | warehouse | chamber, and cools the internal air of a right store | warehouse | chamber), a compressor is driven and the refrigerant | coolant compressed in a store | warehouse | chamber interior and Send to each left-side heat exchanger. The refrigerant sent to the internal heat exchanger and the left internal heat exchanger respectively exchanges heat with the internal air of the central and left warehouses while passing through the heat exchanger, It dissipates heat and condenses. This heats the internal air of the center and left compartments. The heated internal air circulates in each of the central and left warehouses by driving the internal blower fan, whereby the products stored in the central and left warehouses are heated by the circulating internal air. .

  The refrigerant condensed in the heat exchanger in the inner compartment and the heat exchanger in the left compartment passes through the heat radiating pipe constituting the heat radiation path, reaches the gas cooler, and radiates heat to the ambient air by the gas cooler. The refrigerant radiated by the gas cooler is adiabatically expanded in the capillary tube.

  The refrigerant adiabatically expanded and vaporized by the capillary tube is sent to the right-side heat exchanger, evaporates in this right-side heat exchanger, takes heat from the right-side internal air, and cools the internal air. The cooled internal air circulates in the right compartment by driving the internal blower fan, and thereby the product stored in the right compartment is cooled by the circulating internal air. The refrigerant evaporated in the right-side heat exchanger is sucked into the compressor, is compressed by the compressor, and repeats the above-described circulation.

  By the way, in the refrigerant circuit device as described above, when there are a plurality of chambers to be heated (for example, two chambers), heat pump heating is performed based on the internal temperature of each chamber to be heated. As the operation rate is high and the operation becomes inefficient (see FIG. 9), the problem is that the power consumption increases.

  The present invention has been made to solve the above-mentioned problems, and maximizes the operation rate of the multi-chamber heat pump operation and reduces the operation rate of the compressor to perform efficient operation, thereby saving energy. It aims at providing the refrigerant circuit device which can aim at.

In order to achieve the above object, a refrigerant circuit device according to a first aspect of the present invention sucks in an internal heat exchanger disposed in a chamber and refrigerant that has passed through the internal heat exchanger. A compressor that compresses the refrigerant, an external heat exchanger that is disposed outside the chamber, and an expansion mechanism that adiabatically expands the refrigerant that has passed through the external heat exchanger are sequentially connected via a refrigerant pipe. A configured main route; and
A heat exchanger in the first heating chamber that is branched from the refrigerant pipe on the discharge side of the compressor and that is disposed in a chamber that is to be heated among the heat exchangers in the chamber that is compressed by the compressor. A first high-pressure refrigerant pipe that is supplied to the compressor and a refrigerant branch that is branched from the discharge pipe of the compressor, and a chamber that is to be heated is different from the chamber in which the first heat exchanger in the heating chamber is disposed A high-pressure refrigerant introduction path having a second high-pressure refrigerant pipe for supplying the refrigerant compressed by the compressor to the arranged second heat exchanger in the heating cabinet;
A heat dissipation path for supplying the refrigerant that has passed through at least one of the first heat exchanger in the heating chamber and the second heat exchanger in the heating chamber to the upstream side of the external heat exchanger in the main path;
When performing an operation of heating the internal air of the chamber in which the first heat exchanger in the heating chamber and the second heat exchanger in the heating chamber are disposed, the compressed refrigerant is driven by driving the compressor. Control means for controlling to be introduced into the first high-pressure refrigerant line and the second high-pressure refrigerant line,
When the room temperature of the room to be heated is equal to or lower than the heating start synchronization upper limit temperature, when the room temperature is within the range of the heating start synchronization upper limit temperature and the heating start synchronization lower limit temperature, The chamber that has not reached the heating start synchronization upper limit temperature waits for heating of the chamber that is equal to or lower than the heating start synchronization upper limit temperature until the chamber that has not reached the heating start synchronization upper limit temperature, and the chamber that has not reached the heating start synchronization upper limit temperature When the heating start synchronization upper limit temperature is reached, heating of each chamber is started in synchronization.

The refrigerant circuit device according to a second aspect of the present invention is the refrigerant circuit device according to the first aspect, wherein the inlet is connected to the refrigerant pipe on the outlet side of the compressor, and the first outlet is the inlet of the external heat exchanger. A second outlet is connected to the first high-pressure refrigerant pipe, and a third outlet is connected to the second high-pressure refrigerant pipe, and the inlet, the first outlet, A first delivery state communicating the inlet, the second delivery state communicating the inlet and the second outlet, a third delivery state communicating the inlet and the third outlet, and the inlet and the second outlet and A four-way valve switchable to any of the fourth delivery states communicating with the third outlet;
Heats the internal air of the chamber in which the first heat exchanger in the heating chamber and the second heat exchanger in the heating chamber are disposed, and cools the internal air of the chamber in which the other heat exchangers are disposed. When performing the cooling and heating operation, the refrigerant compressed by driving the compressor by adjusting the four-way valve to the fourth delivery state is the first high-pressure refrigerant line and the second high-pressure refrigerant line. The refrigerant that has passed through the external heat exchanger as introduced into the heat exchanger is adiabatically expanded by the expansion mechanism and is sent to the internal heat exchanger.

A refrigerant circuit device according to claim 3 of the present invention is the bypass conduit for introducing the refrigerant that has passed through the external heat exchanger and returning it to the compressor in claim 1 or claim 2 described above. When,
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 solenoid valve,
In the case where the control means performs a single heating operation for heating only the internal air of the chamber in which the first heat exchanger in the heating chamber and the second heat exchanger in the heating chamber are disposed, the four-way valve is The refrigerant adjusted to the fourth delivery state and driven by the compressor to be compressed is introduced into the first high-pressure refrigerant line and the second high-pressure refrigerant line, and the bypass solenoid valve is The refrigerant that has been opened and passed through the external heat exchanger passes through the bypass pipe.

  According to the first aspect of the present invention, the internal heat exchanger disposed inside the chamber, the compressor that sucks and compresses the refrigerant that has passed through the internal heat exchanger, and the outside of the chamber are arranged. A main path configured by sequentially connecting a built-in external heat exchanger and an expansion mechanism for adiabatically expanding the refrigerant that has passed through the external heat exchanger through a refrigerant pipe, and a discharge side of the compressor The first high pressure that supplies the refrigerant branched from the refrigerant line and compressed by the compressor to the first heat exchanger in the heating chamber disposed in the chamber to be heated among the heat exchangers in the refrigerator. A second refrigerant pipe and a second refrigerant pipe branched from the discharge-side refrigerant pipe of the compressor and disposed in a chamber to be heated, which is different from the chamber in which the first heat exchanger in the heating chamber is disposed. A high-pressure refrigerant introduction path having a second high-pressure refrigerant pipe for supplying the refrigerant compressed by the compressor to the heat exchanger in the heating chamber; A heat dissipation path for supplying the refrigerant that has passed through at least one of the heat exchanger in the heating chamber and the second heat exchanger in the second heating chamber to the upstream side of the external heat exchanger in the main path, and in the first heating chamber When performing an operation of heating the internal air of the chamber in which the heat exchanger and the second heat exchanger in the heating chamber are disposed, the refrigerant compressed by driving the compressor is the first high-pressure refrigerant pipe. And control means for controlling to be introduced into the passage and the second high-pressure refrigerant pipe, wherein the control means is provided when the room temperature of any of the heating target chambers is equal to or lower than the heating start synchronization upper limit temperature. When the room temperature is within the range between the heating start synchronization upper limit temperature and the heating start synchronization lower limit temperature, the heating start synchronization upper limit temperature or less until the room that has not reached the heating start synchronization upper limit temperature reaches the heating start synchronization upper limit temperature. The room Waiting for heating, when a chamber that has not reached the heating start synchronization upper limit temperature reaches the heating start synchronization upper limit temperature, the heating rate of each chamber is started in synchronization, thereby maximizing the operation rate of the multi-chamber heat pump operation. Thus, it is possible to provide a refrigerant circuit device that can save energy by reducing the operation rate of the compressor and performing efficient operation.

  According to the invention of claim 2, the inlet is connected to the refrigerant pipe on the outlet side of the compressor, the first outlet is connected to the refrigerant pipe on the inlet side of the external heat exchanger, and the second A first delivery state in which an outlet is connected to the first high-pressure refrigerant line and a third outlet is connected to the second high-pressure refrigerant line, and the inlet and the first outlet are in communication; A second delivery state in which the second outlet communicates, a third delivery state in which the inlet communicates with the third outlet, and a fourth delivery state in which the inlet communicates with the second outlet and the third outlet. A four-way valve that can be switched to any one of the above, and heats the internal air of the chamber in which the first heat exchanger in the heating chamber and the second heat exchanger in the heating chamber are disposed, and heat exchange in the other chamber When the cooling and heating operation is performed to cool the internal air of the chamber in which the vessel is disposed, the four-way valve is moved forward. Passing through the external heat exchanger so that the refrigerant compressed by driving the compressor under the fourth delivery state is introduced into the first high-pressure refrigerant line and the second high-pressure refrigerant line. The adiabatic refrigerant is adiabatically expanded by the expansion mechanism and sent to the internal heat exchanger, thereby reducing the number of parts and reducing the manufacturing cost and maximizing the operation rate of the multi-chamber heat pump operation. Thus, it is possible to provide a refrigerant circuit device that can save energy by reducing the operation rate of the compressor and performing efficient operation.

  According to a third aspect of the present invention, the bypass pipe for introducing the refrigerant that has passed through the external heat exchanger and returning it to the compressor, the bypass pipe being arranged to be openable and closable, and A bypass solenoid valve that, when opened, allows the refrigerant to pass through the bypass pipe, while restricting passage of the refrigerant through the bypass pipe when closed, the control means, In the case of performing a single heating operation for heating only the internal air of the chamber in which the first heat exchanger in the heating chamber and the second heat exchanger in the heating chamber are disposed, the four-way valve is set in the fourth delivery state. And the refrigerant compressed by driving the compressor is introduced into the first high-pressure refrigerant line and the second high-pressure refrigerant line, and the bypass solenoid valve is opened to The refrigerant that has passed through the external heat exchanger passes through the bypass line. By reducing the number of parts, the manufacturing cost can be reduced, the operation rate of the multi-chamber heat pump operation can be maximized, and the operation rate of the compressor can be lowered to perform efficient operation. It is possible to provide a refrigerant circuit device that can save energy.

It is a perspective view which shows the internal structure of the vending machine to which the refrigerant circuit apparatus which is embodiment of this invention was applied. FIG. 2 is a cross-sectional side view of a product storage case, showing the internal structure of the vending machine shown in FIG. 1. It is a conceptual diagram which shows notionally the refrigerant circuit apparatus applied to the vending machine shown in FIG. FIG. 4 is a control block diagram of the refrigerant circuit device shown in FIG. 3. It is explanatory drawing which shows typically the flow of the refrigerant | coolant in the case of performing CCC driving | operation in the refrigerant circuit apparatus shown in FIG. FIG. 4 is an explanatory diagram schematically showing a refrigerant flow when HHC operation is performed in the refrigerant circuit device shown in FIG. 3. It is a figure which shows the control in the case of performing HHC driving | operation in the refrigerant circuit apparatus shown in FIG. It is explanatory drawing which shows typically the flow of the refrigerant | coolant in the case of performing heating independent operation in the refrigerant circuit apparatus shown in FIG. It is a figure which shows the control in the case of performing HHC driving | operation in the conventional refrigerant circuit apparatus.

  Hereinafter, preferred embodiments of a refrigerant circuit device according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a perspective view showing an internal structure of a vending machine to which a refrigerant circuit device according to an embodiment of the present invention is applied. The vending machine exemplified here includes a main body cabinet 1 and a refrigerant circuit device 10.

  The main body cabinet 1 has a rectangular shape with an open front surface. The main body cabinet 1 is provided with, for example, three independent commodity storages (chambers) 3 (3a, 3b, 3c) that are partitioned by two heat insulating partition plates 2 in a side-by-side manner. The commodity storage 3 is a chamber for storing commodities such as canned drinks and plastic bottled drinks in a state of 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 3a. Here, although the internal structure of the right product storage 3a (hereinafter also referred to as the right storage 3a) is shown, the central product storage 3b (hereinafter also referred to as the intermediate storage 3b as appropriate) and the left product storage. The internal structure of the warehouse 3c (hereinafter also referred to as the left warehouse 3c as appropriate) is substantially the same as that of the right warehouse 3a. The right warehouse 3a is a dedicated cooling warehouse, the middle warehouse 3b, and the left warehouse 3c are cooling / heating combined warehouses Yes. 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.

  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 used to open and close the front opening of the main body cabinet 1, and the inner door 5 is used to open and close the front of the product storage 3 and keep the product inside, and is divided into two stages, upper and lower. This is a box-shaped structure having a heat insulator inside. The upper inner door 5a pivots on one end to the outer door 4 and engages the other end on the outer door 4 so that the upper side of the front of the product storage 3 is opened simultaneously with the opening of the outer door 4 to replenish the product. To make it easier. The lower inner door 5b is in a closed state when one end pivots on the main body cabinet 1 and the other end is hooked on the main body cabinet 1 with a latch (not shown) and the outer door 4 is opened. It is possible to prevent the cool air or warm air in the storage 3 from flowing out and to open it as necessary during maintenance.

  The commodity storage 3 is provided with a commodity storage rack 6, a carry-out mechanism 7 and a carry-out shooter 8. The commodity storage rack 6 is for storing commodities in a manner arranged in the vertical direction. The carry-out mechanism 7 is provided at the lower part of the product storage rack 6 and is used to carry out the products at the bottom of the product group stored in the product 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 outlet 4a provided in the outer door 4 through the carry-out door 5c provided in the inner door 5b.

  FIG. 3 is a conceptual diagram conceptually showing the refrigerant circuit device 10 constituting the vending machine shown in FIGS. 1 and 2. The refrigerant circuit device 10 exemplified here includes a refrigerant circuit 10a having a main path 20, a high-pressure refrigerant introduction path 30, a heat radiation path 40, and a bypass path 50, and a control unit (control) that appropriately controls each unit provided in the refrigerant circuit 10a. Means) 90 (see FIG. 4).

  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).

  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 unit 90. 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 (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.

  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 decompresses the refrigerant passing therethrough and adiabatically expands, 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 unit 90.

  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. The internal heat exchanger 25a disposed in the right warehouse 3a (hereinafter also referred to as the right internal heat exchanger 25a) is disposed downstream of the first electronic expansion valve 241 in the internal warehouse 3b. The heat exchanger 25b (hereinafter also referred to as the internal heat exchanger 25b) is an internal heat exchanger 25c (hereinafter, left) disposed in the left chamber 3c on the downstream side of the second electronic expansion valve 242. The internal heat exchanger 25c) is connected to the refrigerant pipe 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 electromagnetic valve 277 is a valve body that can be opened and closed. When the opening command is given from the control unit 90, the first feedback solenoid valve 277 opens and allows the refrigerant to pass therethrough, whereas 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 unit 90, the second feedback solenoid valve 278 opens and allows the refrigerant to pass therethrough, while 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 is a refrigerant pipe on the inlet side of the internal heat exchanger (first heating internal heat exchanger) 25b. It joins to the third junction P3 of the path 26. 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.

  One end of the second high-pressure refrigerant line 32 is connected to the third outlet 224 of the four-way valve 22, and the other end is a refrigerant pipe on the inlet side of the left internal heat exchanger (second internal heat exchanger) 25c. It joins to the fourth junction P4 of the path 26. 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 is adjusted in opening according to a command given from the control unit 90, and adiabatically expands the refrigerant passing 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 electromagnetic 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 solenoid valve 52 is a valve body that can be opened and closed. When the opening command is given from the control unit 90, the bypass electromagnetic valve 52 opens and allows the refrigerant to pass through the bypass pipe 51, while closing from the control unit 90. When a command is given, it closes and restricts the refrigerant from passing through the bypass line 51.

  FIG. 4 is a control block diagram of the refrigerant circuit device 10, and a control unit (control means) 90 that controls the cooling and heating operation in the refrigerant circuit device 10 stores a CPU 91 as a central processing unit and a control program for the CPU 91. A ROM (Read Only Memory) 92, a RAM (Random Access Memory) 93 that stores various programs and data necessary for the control of the CPU 91, and a clock generated by a reference clock generator (not shown) are counted. Thus, the timer 94 for measuring various times and the energizing section 95 having a power circuit for energizing each section provided in the refrigerant circuit device 10 are configured.

  Further, the controller 90 outputs to the controller 90 the keyboard 96 for inputting various setting data of the refrigerant circuit device 10 and the right chamber 3a chamber temperature obtained by measuring the internal air temperature (the chamber temperature) of the right chamber 3a. Inner-compartment temperature sensor 97b for measuring the internal air temperature (in-compartment temperature) of the right-hand warehouse 3b and the inner-compartment 3b for measuring the internal air temperature (in-house temperature) of the right-hand warehouse 3b to the control unit 90. A left chamber temperature sensor 97c is connected to output the left chamber 3c chamber temperature to the control unit 90.

  Further, the compressor 21, the four-way valve 22, the first electronic expansion valve 241, the second electronic expansion valve 242, the third electronic expansion valve 243, the fourth electronic expansion valve 432, the first feedback solenoid valve 277, and the second feedback valve. An electromagnetic valve 278, a bypass electromagnetic valve 52, and the like are connected.

  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 unit 90 adjusts the four-way valve 22 to the first delivery state (the inlet 221 and the first outlet 222 are communicated), and opens the first feedback solenoid valve 277 and the second feedback solenoid valve 278. On the other hand, the bypass solenoid valve 52 is closed. Further, the control unit 90 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. Then, by driving the compressor 21, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  The refrigerant compressed by 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 is compressed and repeats the circulation described above.

  Next, as an example of the cooling and heating operation, a case will be described in which an HHC operation (an 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 unit 90 adjusts the four-way valve 22 to the fourth delivery state (the inlet 221 is communicated with the second outlet 223 and the third outlet 224), and the first feedback solenoid valve 277 and the second feedback valve are adjusted. The solenoid valve 278 and the bypass solenoid valve 52 are closed. The control unit 90 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. Then, by driving the compressor 21, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  The refrigerant compressed by the compressor 21 is discharged from the discharge pipe 216 and passes through the first high-pressure refrigerant line 31 and the second high-pressure refrigerant line 32 via the four-way valve 22 in the fourth 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 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 radiating 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 and the first capillary tube 272 via the distributor 271.

  The refrigerant adiabatically expanded by the first electronic expansion valve 241 and the first capillary tube 272 reaches the right internal heat exchanger 25a, evaporates in the right internal heat exchanger 25a, and generates heat from the internal air of the right internal 3a. Take away and cool the internal air. 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 is compressed and repeats the circulation described above.

  Here, by using FIG. 7, the operation rate of the two-chamber (multiple-chamber) simultaneous heating heat pump operation is maximized, and the operation rate of the compressor 21 is reduced (decreased) to perform efficient operation, thereby saving energy. The control of the refrigerant circuit device 10 that can be achieved will be described.

  When the compressor 21 is driven to perform the HHC operation (the operation of heating the internal air of the middle warehouse 3b and the left warehouse 3c and cooling the internal air of the right warehouse 3a), two chambers (the middle warehouse 3b and the left warehouse 3c). ) Performs heating synchronous operation so that heating can be started at the same time.

  In order to perform the two-chamber heating synchronous operation, in addition to the heating start / stop temperature in the heating chamber of the two chambers, a heating start synchronization upper limit temperature and a heating start synchronization lower limit temperature are determined, and the control unit 90 can select any heating target. When the room temperature of the chamber becomes equal to or lower than the heating start synchronization upper limit temperature and the room temperature is within the range of the heating start synchronization upper limit temperature and the heating start synchronization lower limit temperature, the chamber that has not reached the heating start synchronization upper limit temperature Until the heating start synchronization upper limit temperature is reached, waits for the heating of the chambers that are below the heating start synchronization upper limit temperature, and when the chambers that have not reached the heating start synchronization upper limit temperature reach the heating start synchronization upper limit temperature, Control is performed to synchronize the start of heating of (the central store 3b and the left store 3c) and simultaneously start the heating.

  For example, as shown in FIG. 7, the control unit 90 determines that the inner chamber temperature sensor 97b is detected even if the left chamber 3c chamber temperature measured by the left chamber temperature sensor 97c reaches the heating start temperature first. Wait until the heating of the left warehouse 3c reaches the heating start temperature until the measured temperature in the middle warehouse 3b reaches the heating start temperature. When the temperature in the middle warehouse 3b that has not reached the heating start temperature reaches the heating start temperature, the compressor 21 is driven, and control is performed so that heating is started at the same time in the two chambers (inside storage 3b and left storage 3c).

  Thus, the control part 90 controls, the refrigerant | coolant which can aim at an energy saving by optimizing the operation rate of multi-chamber heat pump operation, and making the operation rate of the compressor 21 low, and performing efficient operation. The circuit device 10 can be provided.

  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 (heats the internal air of the inner warehouse 3b and cools the internal air of the right warehouse 3a and the left warehouse 3c). Operation), 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 90 adjusts the four-way valve 22 to the second delivery state (the inlet 221 and the second outlet 223 communicate with each other) and opens the second feedback electromagnetic valve 278 while the second feedback valve 278 is opened. The electronic expansion valve 242, the first feedback solenoid valve 277, and the bypass solenoid valve 52 are closed. Further, the control unit 90 adjusts the opening degrees of the first electronic expansion valve 241, the third electronic expansion valve 243, and the fourth electronic expansion valve 432 to a predetermined size. And by driving the compressor 21, the refrigerant | coolant compressed with the compressor 21 circulates as follows.

  The refrigerant compressed by 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 is adiabatically expanded in the first electronic expansion valve 241, the first capillary tube 272, the third electronic expansion valve 243, and the third capillary tube 274 via the distributor 271.

  The refrigerant adiabatically expanded by the first electronic expansion valve 241 and the first capillary tube 272 reaches the right internal heat exchanger 25a, evaporates in the right internal heat exchanger 25a, and generates heat from the internal air of the right internal 3a. Take away and cool the internal air. 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 and the third capillary tube 274 reaches the left internal heat exchanger 25c, evaporates in the left internal heat exchanger 25c, and generates heat from the internal air of the left internal 3c. Take away and cool the internal air. 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 is compressed and repeats the circulation described above.

  When performing the HCC operation, the control unit 90 adjusts the four-way valve 22 to the third delivery state (the inlet 221 and the third outlet 224 are communicated) and opens the first feedback electromagnetic valve 277, while the third The electronic expansion valve 243, the second feedback solenoid valve 278, and the bypass solenoid valve 52 are closed. Further, the control unit 90 adjusts the opening degrees of the first electronic expansion valve 241, the second electronic expansion valve 242, and the fourth electronic expansion valve 432 to a predetermined size. And by driving the compressor 21, the refrigerant | coolant compressed with the compressor 21 circulates as follows.

  The refrigerant compressed by 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, the first capillary tube 272, the second electronic expansion valve 242, and the second capillary tube 273 via the distributor 271.

  The refrigerant adiabatically expanded by the first electronic expansion valve 241 and the first capillary tube 272 reaches the right internal heat exchanger 25a, evaporates in the right internal heat exchanger 25a, and generates heat from the internal air of the right internal 3a. Take away and cool the internal air. 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 and the second capillary tube 273 reaches the internal heat exchanger 25b, evaporates in the internal heat exchanger 25b, and generates heat from the internal air of the internal chamber 3b. Take away and cool the internal air. 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 is compressed and repeats the circulation described above.

  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 unit 90 adjusts the four-way valve 22 to the fourth delivery state (the inlet 221 communicates with the second outlet 223 and the third outlet 224), and opens the bypass solenoid valve 52 while the first electronic The expansion valve 241, the second electronic expansion valve 242, the third electronic expansion valve 243, the first feedback solenoid valve 277, and the second feedback solenoid valve 278 are closed. In addition, the control unit 90 adjusts the opening degree of the fourth electronic expansion valve 432 to a predetermined size. Then, by driving the compressor 21, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  The refrigerant compressed by the compressor 21 is discharged from the discharge pipe 216 and passes through the first high-pressure refrigerant line 31 and the second high-pressure refrigerant line 32 via the four-way valve 22 in the fourth 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 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 radiating 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 is compressed and repeats the circulation described above.

  Even in the case of performing the heating single operation for heating the internal air of only the middle store 3b and the left store 3c, it is possible to perform the two-chamber heating synchronous operation as in the case of performing the HHC operation.

  In order to perform the two-chamber heating synchronous operation, in addition to the heating start / stop temperature in the heating chamber of the two chambers, a heating start synchronization upper limit temperature and a heating start synchronization lower limit temperature are determined, and the control unit 90 can select any heating target. When the room temperature of the chamber becomes equal to or lower than the heating start synchronization upper limit temperature and the room temperature is within the range of the heating start synchronization upper limit temperature and the heating start synchronization lower limit temperature, the chamber that has not reached the heating start synchronization upper limit temperature Until the heating start synchronization upper limit temperature is reached, waits for the heating of the chambers that are below the heating start synchronization upper limit temperature, and when the chambers that have not reached the heating start synchronization upper limit temperature reach the heating start synchronization upper limit temperature, Control is performed to synchronize the start of heating of (the central store 3b and the left store 3c) and simultaneously start the heating.

  For example, as shown in FIG. 7, the control unit 90 determines that the inner chamber temperature sensor 97b is detected even if the left chamber 3c chamber temperature measured by the left chamber temperature sensor 97c reaches the heating start temperature first. Wait until the heating of the left warehouse 3c reaches the heating start temperature until the measured temperature in the middle warehouse 3b reaches the heating start temperature. When the temperature in the middle warehouse 3b that has not reached the heating start temperature reaches the heating start temperature, the compressor 21 is driven, and control is performed so that heating is started at the same time in the two chambers (inside storage 3b and left storage 3c).

  Thus, the control part 90 controls, the refrigerant | coolant which can aim at an energy saving by optimizing the operation rate of multi-chamber heat pump operation, and making the operation rate of the compressor 21 low, and performing efficient operation. The circuit device 10 can be provided.

  In addition, although the operation | movement which heats only the internal air of only the store | warehouse | chamber 3b and the left store | warehouse | chamber 3c was demonstrated here as an example of heating independent operation, in the said refrigerant circuit device 10, the operation | movement which heats internal air only of the store | warehouse | chamber 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 unit 90 adjusts the four-way valve 22 to the second delivery state (the inlet 221 and the second outlet 223 communicate with each other), and the bypass solenoid valve 52 is set. On the other hand, the first electronic expansion valve 241, the second electronic expansion valve 242, the third electronic expansion valve 243, the first feedback solenoid valve 277, and the second feedback solenoid valve 278 are closed. In addition, the control unit 90 adjusts the opening degree of the fourth electronic expansion valve 432 to a predetermined size. And by driving the compressor 21, the refrigerant | coolant compressed with the compressor 21 circulates as follows.

  The refrigerant compressed by 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 is compressed and repeats the circulation described above.

  When performing the operation of heating the internal air of only the left chamber 3c, the control unit 90 adjusts the four-way valve 22 to the third delivery state (the inlet 221 and the third outlet 224 are communicated), and the bypass solenoid valve 52 is set. On the other hand, the first electronic expansion valve 241, the second electronic expansion valve 242, the third electronic expansion valve 243, the first feedback solenoid valve 277, and the second feedback solenoid valve 278 are closed. In addition, the control unit 90 adjusts the opening degree of the fourth electronic expansion valve 432 to a predetermined size. And by driving the compressor 21, the refrigerant | coolant compressed with the compressor 21 circulates as follows.

  The refrigerant compressed by 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 is compressed and repeats the circulation described above.

  As described above, according to the present invention, the in-compartment heat exchanger 25 disposed inside the commodity storage (chamber) 3 and the compression that sucks and compresses the refrigerant that has passed through the in-compartment heat exchanger 25. Machine 21, an external heat exchanger 23 disposed outside the commodity storage 3, and an expansion mechanism 24 for adiabatic expansion of the refrigerant that has passed through the external heat exchanger 23 are sequentially connected by a refrigerant pipe 26. The main passage 20 configured as described above and the refrigerant pipe 26 on the discharge side of the compressor 21, and the refrigerant compressed by the compressor 21 in the internal heat exchanger 25, the inner warehouse 3 b to be heated. Branching from a first high-pressure refrigerant pipe 31 that is supplied to the internal heat exchanger (first heating internal heat exchanger) 25b disposed in the inside, and a refrigerant pipe 26 on the discharge side of the compressor 21, and Heat in the left warehouse disposed in the left warehouse 3c to be heated is different from the middle warehouse 3b in which the inner heat exchanger 25b is disposed. A high-pressure refrigerant introduction path 30 having a second high-pressure refrigerant pipe 32 for supplying the refrigerant compressed by the compressor 21 to the exchanger (second heat exchanger in the heating chamber) 25c; 25b and a heat dissipation path 40 for supplying the refrigerant that has passed through at least one of the left-side heat exchanger 25c to the upstream side of the external heat exchanger 23 in the main path 20, and the inner-center heat exchanger 25b and the left-side heat In the case of performing an operation of heating the internal air of the central store 3b and the left store 3c in which the exchanger 25c is disposed, the refrigerant compressed by driving the compressor 21 is supplied to the first high-pressure refrigerant pipe 31 and the second high-pressure refrigerant pipe 31. And a control unit (control means) 90 that controls to be introduced into the high-pressure refrigerant pipe 32. The control unit 90 starts heating the room temperature of the inner warehouse 3b and the left warehouse 3c to be heated. When the temperature is below the upper synchronization limit temperature, the room temperature When it is within the range between the heating start synchronization upper limit temperature and the heating start synchronization lower limit temperature, heating is started until one of the middle chamber 3b and the left chamber 3c that has not reached the heating start synchronization upper limit temperature reaches the heating start synchronization upper limit temperature. Waiting for heating of either the central warehouse 3b or the left warehouse 3c that is equal to or lower than the synchronization upper limit temperature, and either the middle warehouse 3b or the left warehouse 3c that has not reached the heating start synchronization upper limit temperature reaches the heating start synchronization upper limit temperature. When it reaches, the heating of the central warehouse 3b and the left warehouse 3c is started in synchronization, thereby maximizing the operation rate of the multi-chamber heat pump operation and reducing the operation rate of the compressor 21 to perform efficient operation. Thus, it is possible to provide the refrigerant circuit device 10 that can save energy.

  Further, the inlet 221 is connected to the refrigerant pipe 26 of the discharge pipe (exit side) 216 of the compressor 21, the first outlet 222 is connected to the refrigerant pipe 26 on the inlet side of the external heat exchanger 23, and the second A first delivery state in which the outlet 223 is connected to the first high-pressure refrigerant line 31 and the third outlet 224 is connected to the second high-pressure refrigerant line 32, and the inlet 221 and the first outlet 222 communicate with each other; 221 and the second outlet 223 communicate with each other, the second delivery state that communicates the inlet 221 and the third outlet 224, and the fourth that communicates the inlet 221 with the second outlet 223 and the third outlet 224. A four-way valve 22 that can be switched to any one of the delivery states is provided, and an internal heat exchanger (first heating internal heat exchanger) 25b and a left internal heat exchanger (second heating internal heat exchanger) 25c. The middle warehouse 3b and the left warehouse 3c In the case of performing a cooling heating operation for heating the internal air and cooling the internal air of the right warehouse 3a in which the right internal heat exchanger (other internal heat exchanger) 25a is disposed, the four-way valve 22 is set to The refrigerant compressed by driving the compressor 21 under the condition of the four delivery state is passed through the external heat exchanger 23 so as to be introduced into the first high-pressure refrigerant line 31 and the second high-pressure refrigerant line 32. The refrigerant is adiabatically expanded by the first electronic expansion valve (expansion mechanism) 241 and sent to the right-side heat exchanger 25a, thereby reducing the number of parts and reducing the manufacturing cost. It is possible to provide the refrigerant circuit device 10 that can save energy by maximizing the operation rate of the heat pump operation and reducing the operation rate of the compressor 21 to perform efficient operation.

  In addition, a bypass pipe 51 for introducing the refrigerant that has passed through the external heat exchanger 23 and returning it to the compressor 21, and a bypass pipe 51 that can be opened and closed in the bypass pipe 51 and opened. And a bypass electromagnetic valve 52 that restricts the passage of the refrigerant to the bypass pipe 51 when the refrigerant is closed, and the control unit 90 includes an internal heat exchanger ( Heating-only operation for heating only the internal air of the central storage 3b and the left storage 3c in which the first heat storage internal heat exchanger) 25b and the left internal heat exchanger (second heating internal heat exchanger) 25c are arranged. Is performed, the refrigerant compressed by driving the compressor 21 by adjusting the four-way valve 22 to the fourth delivery state is introduced into the first high-pressure refrigerant line 31 and the second high-pressure refrigerant line 32. And open the bypass solenoid valve 52 to heat By allowing the refrigerant that has passed through the vessel 23 to pass through the bypass line 51, the number of parts is reduced, the manufacturing cost is reduced, the operation rate of the multi-chamber heat pump operation is maximized, and the operation of the compressor 21 is performed. By performing efficient operation at a low rate, the refrigerant circuit device 10 capable of saving energy can be provided.

  As described above, the refrigerant circuit device according to the present invention is useful for vending machines that sell products such as canned beverages and beverages containing plastic bottles.

3 product storage (room)
3a Right warehouse (room)
3b Nakago (room)
3c Left warehouse (room)
DESCRIPTION OF SYMBOLS 10 Refrigerant circuit apparatus 10a Refrigerant circuit 20 Main path | route 21 Compressor 22 Four-way valve 23 External heat exchanger 24 Expansion mechanism 241 1st electronic expansion valve (expansion mechanism)
242 Second electronic expansion valve (expansion mechanism)
243 Third electronic expansion valve (expansion mechanism)
25 Internal heat exchanger 25a Right internal heat exchanger 25b Internal internal heat exchanger (first heating internal heat exchanger)
25c Heat exchanger in left warehouse (heat exchanger in second heating compartment)
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 solenoid valve 90 Control unit (control means)

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;
A heat exchanger in the first heating chamber that is branched from the refrigerant pipe on the discharge side of the compressor and that is disposed in a chamber that is to be heated among the heat exchangers in the chamber that is compressed by the compressor. A first high-pressure refrigerant pipe that is supplied to the compressor and a refrigerant branch that is branched from the discharge pipe of the compressor, and a chamber that is to be heated is different from the chamber in which the first heat exchanger in the heating chamber is disposed A high-pressure refrigerant introduction path having a second high-pressure refrigerant pipe for supplying the refrigerant compressed by the compressor to the arranged second heat exchanger in the heating cabinet;
A heat dissipation path for supplying the refrigerant that has passed through at least one of the first heat exchanger in the heating chamber and the second heat exchanger in the heating chamber to the upstream side of the external heat exchanger in the main path;
When performing an operation of heating the internal air of the chamber in which the first heat exchanger in the heating chamber and the second heat exchanger in the heating chamber are disposed, the compressed refrigerant is driven by driving the compressor. Control means for controlling to be introduced into the first high-pressure refrigerant line and the second high-pressure refrigerant line,
When the room temperature of the room to be heated is equal to or lower than the heating start synchronization upper limit temperature, when the room temperature is within the range of the heating start synchronization upper limit temperature and the heating start synchronization lower limit temperature, The chamber that has not reached the heating start synchronization upper limit temperature waits for heating of the chamber that is equal to or lower than the heating start synchronization upper limit temperature until the chamber that has not reached the heating start synchronization upper limit temperature, and the chamber that has not reached the heating start synchronization upper limit temperature When the heating start synchronization upper limit temperature is reached, heating of each chamber is started in synchronization with each other. The inlet is connected to the refrigerant line on the outlet side of the compressor, the first outlet is connected to the refrigerant line on the inlet side of the external heat exchanger, and the second outlet is connected to the first high-pressure refrigerant line. And a third outlet is connected to the second high-pressure refrigerant line, a first delivery state in which the inlet and the first outlet are communicated, and a second delivery in which the inlet and the second outlet are communicated. A four-way valve that can be switched to any one of a state, a third delivery state in which the inlet communicates with the third outlet, and a fourth delivery state in which the inlet communicates with the second outlet and the third outlet. ,
Heats the internal air of the chamber in which the first heat exchanger in the heating chamber and the second heat exchanger in the heating chamber are disposed, and cools the internal air of the chamber in which the other heat exchangers are disposed. When performing the cooling and heating operation, the refrigerant compressed by driving the compressor by adjusting the four-way valve to the fourth delivery state is the first high-pressure refrigerant line and the second high-pressure refrigerant line. 2. The refrigerant according to claim 1, wherein the refrigerant that has passed through the outside heat exchanger as introduced into the inside is adiabatically expanded by the expansion mechanism and is sent to the inside heat exchanger. Circuit device. A bypass line for introducing the refrigerant that has passed through the external heat exchanger and returning it to the compressor;
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 solenoid valve,
In the case where the control means performs a single heating operation for heating only the internal air of the chamber in which the first heat exchanger in the heating chamber and the second heat exchanger in the heating chamber are disposed, the four-way valve is The refrigerant adjusted to the fourth delivery state and driven by the compressor to be compressed is introduced into the first high-pressure refrigerant line and the second high-pressure refrigerant line, and the bypass solenoid valve is The refrigerant circuit device according to claim 1 or 2, wherein the refrigerant that has been opened and has passed through the external heat exchanger passes through the bypass pipe.

Images