JP2010175119A - Cooling and heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling and heating device successfully performing cooling operation and heat pump operation while reducing cost. <P>SOLUTION: The cooling and heating device is provided with: a cooling route 20 constituted by interconnecting a compressor 21, a condenser 22, a capillary tube 23 and an evaporator 24; a heating route 30 constituted to condense a refrigerant compressed by the compressor 21 by an interior heat exchanger 31 and send the refrigerant to the capillary tube 23; and a valve unit 40 allowing the refrigerant compressed by the compressor 21 to flow in the condenser 22 during cooling operation and to flow in the interior heat exchanger 31 during heat pump operation. During cooling operation, the refrigerant passed through the condenser 22 is allowed to flow in the interior heat exchanger 31, while, during heat pump operation, the refrigerant passed through the interior heat exchanger 31 is allowed to flow in the condenser 22, so as to make constant the volume where the high pressure refrigerant is made to flow. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooling and heating device, and more particularly, to a cooling and heating device that is applied to, for example, a vending machine and that cools or heats the internal atmosphere of a product container defined in a vending machine body. Is.

  2. Description of the Related Art Conventionally, as a cooling and heating device applied to, for example, a vending machine, a device provided with a refrigerant circuit is known. As such a refrigerant circuit, a cooling path and a heating path are generally provided. The cooling path is configured by sequentially connecting an evaporator, a compressor, a condenser, and an expansion mechanism through a refrigerant pipe.

  The evaporator is disposed inside the commodity storage of the vending machine. This evaporator cools the internal air (internal atmosphere) of the product storage box by the supplied refrigerant passing through a predetermined flow path and evaporating. The compressor is disposed in the machine room inside the vending machine main body and outside the product container. The compressor sucks the refrigerant evaporated by the evaporator and compresses the sucked refrigerant into a high temperature and high pressure state. Are discharged. The condenser is disposed in the machine room in the same manner as the compressor, introduces the refrigerant compressed by the compressor through the refrigerant pipe, and heats the ambient air by condensing the introduced refrigerant, that is, into the ambient air. It dissipates heat. The expansion mechanism is disposed in the machine room in the same manner as the compressor and the condenser, and decompresses the refrigerant condensed in the condenser and adiabatically expands the refrigerant.

  The heating path is a path having an internal heat exchanger. The internal heat exchanger is disposed inside the commodity storage. In more detail, it is arrange | positioned inside the goods storage container which accommodates the goods used as the heating object. This internal heat exchanger has an inlet side connected to a branch pipe branched from a refrigerant pipe connecting a compressor and a condenser constituting a cooling path, and a refrigerant pipe connecting a condenser and an expansion mechanism. An outlet side is connected to a return pipe provided in a mode of joining. Such an in-compartment heat exchanger heats the internal air of the product storage container in which the refrigerant is compressed by introducing the refrigerant compressed by the compressor through the branch pipe and condensing the introduced refrigerant.

  In such a refrigerant circuit, a cooling electromagnetic valve and a heating electromagnetic valve are provided in the refrigerant piping from the compressor to the condenser and the branch piping from the compressor to the internal heat exchanger, respectively. While the cooling solenoid valve opens when performing a cooling operation to cool the internal atmosphere of all the commodity containers provided with the evaporator, while allowing the refrigerant compressed by the compressor to flow to the condenser, In the case of other operations, the operation is closed to restrict the refrigerant compressed by the compressor from flowing to the condenser. On the other hand, the heating solenoid valve is opened when performing a heat pump operation that heats the internal atmosphere of any of the product storage units provided with the internal heat exchanger and cools the internal atmosphere of the other product storage units, While the refrigerant compressed by the compressor is allowed to flow to the internal heat exchanger, it is closed in other operations and the refrigerant compressed by the compressor is allowed to flow to the internal heat exchanger. It is something to regulate.

  And, when performing the cooling operation, the refrigerant flows only in the cooling path, and when performing the heat pump operation, based on the idea that the refrigerant flows through the heating path and a part of the cooling path, There is known a cooling and heating device in which check valves are provided on the downstream side of the condenser in the cooling path and on the downstream side of the internal heat exchanger in the heating path (see, for example, Patent Document 1).

JP 2007-328762 A

  However, in the cooling and heating apparatus proposed in Patent Document 1 as described above, since the check valves are provided on the downstream side of the condenser and the downstream side of the internal heat exchanger, the cooling operation is performed. The volume in which the high-pressure refrigerant flows in the refrigerant circuit in the case differs from the volume in which the high-pressure refrigerant flows in the refrigerant circuit in the case where the heat pump operation is performed. The difference in the volume (hereinafter also referred to as the high-pressure side volume) through which such a high-pressure refrigerant flows is different from the pressure of the high-pressure refrigerant in the cooling operation and the pressure of the high-pressure refrigerant in the heat pump operation. Therefore, it has been necessary to employ a simple diaphragm adjusting mechanism as the expansion mechanism, which has led to an increase in cost.

  An object of this invention is to provide the cooling heating apparatus which can perform a cooling operation and a heat pump operation | work favorably, aiming at the reduction of cost in view of the said situation.

  In order to achieve the above object, a cooling and heating apparatus according to claim 1 of the present invention includes a compressor that compresses a refrigerant, a condenser that condenses the refrigerant compressed by the compressor, and a condenser that condenses the refrigerant. A cooling path configured by sequentially connecting an expansion mechanism for adiabatic expansion of the refrigerant and an evaporator for evaporating the refrigerant adiabatically expanded by the expansion mechanism, and an interior for introducing and condensing the refrigerant compressed by the compressor A heating path having a heat exchanger and configured to send the refrigerant condensed in the internal heat exchanger to the expansion mechanism, and when performing a cooling operation, the refrigerant compressed by the compressor is While permitting the flow to the condenser and restricting the flow to the internal heat exchanger, when performing the heat pump operation, the refrigerant compressed by the compressor is restricted from flowing to the condenser. And flow to the internal heat exchanger When the cooling operation is performed in a cooling and heating device including a valve unit that allows the refrigerant to pass, the refrigerant that has passed through the condenser is allowed to flow through the internal heat exchanger, while the heat pump operation is performed. When performing, the capacity | capacitance through which a high voltage | pressure refrigerant | coolant flows is made constant by accept | permitting that the refrigerant | coolant which passed the said internal heat exchanger flows into the said condenser.

  According to the cooling and heating apparatus of the present invention, when performing the cooling operation, the refrigerant that has passed through the condenser is allowed to flow through the internal heat exchanger, while when performing the heat pump operation, the internal heat exchange is performed. Since the volume of the high-pressure refrigerant flowing is made constant by allowing the refrigerant that has passed through the condenser to flow to the condenser, the pressure of the high-pressure refrigerant when performing the cooling operation and the pressure of the high-pressure refrigerant when performing the heat pump operation Therefore, it is possible to sufficiently adiabatically expand with a common capillary tube, and there is no need to employ an expansion mechanism having a throttle adjustment mechanism such as an electronic expansion valve as in the prior art. Therefore, the cooling operation and the heat pump operation can be performed satisfactorily while reducing the cost.

FIG. 1 is a cross-sectional view showing a case where an internal structure of a vending machine to which a cooling and heating apparatus 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 the cooling and heating apparatus according to the embodiment of the present invention. FIG. 4 is a conceptual diagram conceptually showing the flow of the refrigerant when performing the cooling operation. FIG. 5 is a conceptual diagram conceptually showing the flow of the refrigerant when the heat pump operation is performed.

  Exemplary embodiments of a cooling and heating apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing a case where an internal structure of a vending machine to which a cooling and heating apparatus according to an embodiment of the present invention is applied is viewed from the front. The vending machine illustrated here includes a main body cabinet 1.

  The main body cabinet 1 has a rectangular shape with an open front surface. The main body cabinet 1 is provided with three independent commodity containers 3 partitioned by, for example, two heat insulating partition plates 2 in a side-by-side manner. This product storage 3 is for storing products such as canned beverages and beverages containing plastic bottles while maintaining 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 3 (hereinafter also referred to as the right storage 3a) is shown, but the central product storage 3 (hereinafter also referred to as the intermediate storage 3b) and the left product storage 3 are shown. The internal structure (hereinafter also referred to as the left warehouse 3c as appropriate) has substantially the same configuration as 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 product storage 3 is provided with a product 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 4 a provided on the outer door 4.

  FIG. 3 is a conceptual diagram conceptually showing the cooling and heating apparatus according to the embodiment of the present invention. The cooling and heating apparatus exemplified here includes a cooling path 20 and a heating path 30 and includes a refrigerant circuit 10 in which a refrigerant (carbon dioxide) is sealed.

  The cooling path 20 is configured by sequentially connecting a compressor 21, a condenser 22, a capillary tube 23, and an evaporator 24 through a refrigerant pipe 25.

  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 to be in a high-temperature and high-pressure state (high-temperature and high-pressure refrigerant), and discharges it from the discharge port.

  As shown in FIG. 2, the condenser 22 is disposed in the machine room 9 similarly to the compressor 21. The condenser 22 condenses the refrigerant that passes therethrough. More specifically, the refrigerant compressed by the compressor 21 and discharged from the discharge port and sent out through the refrigerant pipe 25 is condensed by exchanging heat with ambient air. In the vicinity of the condenser 22, an external fan B1 is provided.

  As shown in FIG. 2, the capillary tube 23 is disposed in the machine room 9 similarly to the compressor 21 and the condenser 22. The capillary tube 23 is for adiabatic expansion by depressurizing the refrigerant passing therethrough.

  A plurality (three in the illustrated example) of the evaporators 24 are provided, which are disposed in the lower internal area of each commodity storage 3 and on the front side of the rear duct D (see FIG. 2). The refrigerant pipe 25 connecting the evaporator 24 and the capillary tube 23 is branched into three by a distributor 26 provided in the middle thereof, and the evaporator 24 (hereinafter, right evaporation) provided in the right warehouse 3a. The evaporator 24a (also referred to as the evaporator 24a), the evaporator 24 (also referred to hereinafter as the middle evaporator 24b) disposed in the intermediate store 3b, and the evaporator 24 ( Hereinafter, they are respectively connected to the inlet side of the left evaporator 24c). The evaporator 24 evaporates the passing refrigerant and cools the internal air (internal atmosphere) of the commodity storage 3.

  Further, in the refrigerant pipe 25, low pressure side solenoid valves 271, 272, 273 and expansion mechanisms 281, 282, 283 are provided on the way from the distributor 26 to the right evaporator 24a, the middle evaporator 24b, and the left evaporator 24c, respectively. Are provided. The low pressure side solenoid valves 271, 272, and 273 are valve bodies that can be opened and closed. If it is closed, the passage of the refrigerant is restricted. The expansion mechanisms 281, 282, and 283 are, for example, capillary tubes, and are for adiabatically expanding the refrigerant that passes therethrough.

  The refrigerant pipe 25 connected to the outlet side of the middle evaporator 24b and the left evaporator 24c joins at the first junction P1 on the way, and further the refrigerant pipe 25 connected to the outlet side of the right evaporator 24a The two merge points P2 are merged and connected to the compressor 21.

  The heating path 30 includes an internal heat exchanger 31 and a gas cooler 32, which are connected by a heat radiation pipe 34 and connected to the cooling path 20 by a branch pipe 33 and a return pipe 35.

  The in-compartment heat exchanger 31 is disposed in the left warehouse 3 c, and the inlet side thereof is connected to the branch pipe 33. The branch pipe 33 branches from a high-pressure side branch point P3 in the middle of the path between the compressor 21 and the condenser 22 and communicates with the inlet of the internal heat exchanger 31. This internal heat exchanger 31 is for condensing the refrigerant passing therethrough and heating the internal air of the left storage 3c.

  The gas cooler 32 is connected to the internal heat exchanger 31 through the heat radiating pipe 34, and its inlet communicates with the outlet of the internal heat exchanger 31 through the heat radiating pipe 34. The gas cooler 32 is disposed in the vicinity of the condenser 22 that constitutes the cooling path 20, and exchanges heat between the refrigerant passing therethrough and the ambient air to dissipate heat to the refrigerant. A return pipe 35 is connected to the outlet side of the gas cooler 32. The return pipe 35 is connected to the gas cooler 32 and is connected to the refrigerant pipe 25 constituting the cooling path 20, that is, the third junction P <b> 4 of the refrigerant pipe 25 between the condenser 22 and the capillary tube 23.

  In the refrigerant circuit 10 having the above configuration, an internal heat exchanger 36 and a valve unit 40 are further provided. The internal heat exchanger 36 exchanges heat between the refrigerant that flows through the third junction P4 and flows toward the capillary tube 23 and the refrigerant that flows through the evaporator 24 and flows toward the compressor 21. is there.

  The valve unit 40 includes a cooling switching valve 41 and a heating switching valve 42. The cooling switching valve 41 is provided in the refrigerant pipe 25 constituting the cooling path 20, that is, the refrigerant pipe 25 extending from the high-pressure side branch point P <b> 3 to the condenser 22. The cooling switching valve 41 is a valve body that can be opened and closed. When the opening command is given from the control unit, the cooling switching valve 41 is opened to allow the passage of the refrigerant, while when the closing command is given, the cooling switching valve 41 is closed. It regulates the passage of refrigerant.

  The heating switching valve 42 is provided in a branch pipe 33 that constitutes the heating path 30, that is, a pipe that extends from the high-pressure side branch point P <b> 3 to the internal heat exchanger 31. The heating switching valve 42 is a valve body that can be opened and closed. When the opening command is given from the control unit, the heating switching valve 42 opens and allows the refrigerant to pass therethrough, but closes when the closing command is given. It regulates the passage of refrigerant.

  When one of the cooling switching valve 41 and the heating switching valve 42 is open, the other is closed. That is, when the cooling switching valve 41 is opened, the heating switching valve 42 is closed, while when the heating switching valve 42 is opened, the cooling switching valve 41 is closed.

  The cooling and heating device having the above-described configuration cools or heats the product stored in the product storage 3 as follows.

  First, the case of performing a cooling operation (in this embodiment, an operation for cooling the internal air of all the commodity containers 3) will be described. In this case, the cooling switching valve 41 and the low pressure side electromagnetic valves 271, 272, and 273 are opened, and the heating switching valve 42 is closed. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  That is, the refrigerant compressed by the compressor 21 passes through the opened cooling switching valve 41 and reaches the condenser 22. The refrigerant that has reached the condenser 22 dissipates heat to the ambient air (outside air) and condenses while passing through the condenser 22. The refrigerant condensed in the condenser 22 adiabatically expands in the capillary tube 23 after passing through the internal heat exchanger 36.

  The refrigerant vaporized by adiabatic expansion in the capillary tube 23 is branched into three by the distributor 26 and further adiabatically expanded by the expansion mechanisms 281, 282, and 283, and the right evaporator 24 a, the middle evaporator 24 b, and the left evaporator. 24c, it evaporates in each evaporator 24, 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 each internal blower fan F2, whereby the products stored in each product storage 3 are cooled to the circulating internal air. The refrigerant evaporated in each evaporator 24 passes through the internal heat exchanger 36, is then sucked into the compressor 21, is compressed by the compressor 21, and repeats the circulation described above.

  Next, the case where the heat pump operation (in this embodiment, the operation of heating the internal air of the left warehouse 3c and cooling the internal air of the right warehouse 3a and the middle warehouse 3b) will be described. In this case, the cooling switching valve 41 and the low pressure side solenoid valve 273 are closed, and the heating switching valve 42 and the low pressure side solenoid valves 271 and 272 are opened. As a result, the refrigerant compressed by the compressor 21 circulates as shown in FIG.

  That is, the refrigerant compressed by the compressor 21 enters the branch pipe 33 from the high-pressure side branch point P3, passes through the opened heating switching valve 42, and reaches the internal heat exchanger 31. The refrigerant that reaches the internal heat exchanger 31 exchanges heat with the internal air of the left storage 3c while passing through the heat exchanger, and dissipates heat to the internal air to condense. Thereby, the internal air of the left warehouse 3c is heated. The heated internal air circulates in each of the left warehouses 3c by driving the internal blower fan F2, whereby the products stored in the left warehouse 3c are heated to the circulating internal air.

  The refrigerant condensed in the internal heat exchanger 31 passes through the heat radiating pipe 34, reaches the gas cooler 32, and radiates heat to the ambient air by the gas cooler 32. The refrigerant radiated by the gas cooler 32 passes through the return pipe 35 and then reaches the third junction P4. The refrigerant that has entered the cooling path 20 at the third junction P4 reaches the capillary tube 23 after passing through the internal heat exchanger 36, and is adiabatically expanded in the capillary tube 23.

  The refrigerant vaporized by adiabatic expansion in the capillary tube 23 passes through the low-pressure side electromagnetic valves 271 and 272 opened via the distributor 26, reaches the right evaporator 24a and the middle evaporator 24b, and these right evaporators 24a. And the middle evaporator 24b evaporates to take heat from the internal air of the right warehouse 3a and the central warehouse 3b, and cools the internal air. The cooled internal air circulates inside each of the right warehouse 3a and the middle warehouse 3b by driving the internal blower fan F2, thereby cooling the products accommodated in each of the right warehouse 3a and the middle warehouse 3b. . The refrigerant evaporated in the right evaporator 24a and the middle evaporator 24b passes through the internal heat exchanger 36, is then sucked into the compressor 21, is compressed by the compressor 21, and repeats the circulation described above.

  By the way, in such a refrigerant circuit 10, a check valve or the like is not provided on the upstream side of the third junction P4, that is, on the downstream side of the condenser 22 or the downstream side of the gas cooler 32. Therefore, when performing the cooling operation, a part of the refrigerant (high-pressure refrigerant) that has passed through the condenser 22 enters the heating path 30 from the third junction P4, and the return pipe 35, the gas cooler 32, the heat radiating pipe 34, and the warehouse. It will enter the internal heat exchanger 31 and the branch pipe 33. The entering refrigerant stays in the heating path 30. That is, when performing the cooling operation, the refrigerant circulates as shown in FIG. 4 while a part of the refrigerant stays in the heating path 30.

  On the other hand, when the heat pump operation is performed, part of the refrigerant (high-pressure refrigerant) that has passed through the gas cooler 32 enters the upstream side of the cooling path 20 from the third junction P4, that is, the refrigerant pipe 25 and the condenser 22. Become. The entering refrigerant stays in the condenser 22 and the refrigerant pipe 25. That is, when performing the heat pump operation, the refrigerant circulates as shown in FIG. 5 with a part of the refrigerant staying in the condenser 22 and the refrigerant pipe 25.

  When the cooling operation is performed in this way, the refrigerant that has passed through the condenser 22 is allowed to flow through the internal heat exchanger 31, while when the heat pump operation is performed, the refrigerant has passed through the internal heat exchanger 31. By allowing the refrigerant to flow into the condenser 22, the high-pressure side volume (the volume through which the high-pressure refrigerant flows) in the refrigerant circuit 10 is made constant in any operation.

  Even when the cooling operation and the heat pump operation are performed, the high-pressure side volume in the refrigerant circuit 10 is constant, so that the pressure of the high-pressure refrigerant when performing the cooling operation and the pressure of the high-pressure refrigerant when performing the heat pump operation are large. There is no difference, and the common capillary tube 23 can be sufficiently adiabatically expanded, and there is no need to employ an expansion mechanism having a throttle adjustment mechanism such as an electronic expansion valve as in the prior art.

  Therefore, according to the cooling and heating apparatus according to the present embodiment, the high-pressure side volume in the refrigerant circuit 10 is constant even when performing the cooling operation and the heat pump operation, so that the cooling operation and the heat pump can be performed while reducing the cost. Driving can be performed satisfactorily. In particular, if the amount of refrigerant sealed in the refrigerant circuit 10 is increased in consideration of the amount of refrigerant remaining in the cooling operation or heat pump operation, the cooling capacity and the heating capacity can be improved.

  Further, according to the cooling and heating apparatus, when the cooling operation is performed, the heating path 30 is also used, and when the heat pump operation is performed, the upstream side of the cooling path 20 (the upstream side from the third junction P4) is used. As a result, the high-pressure side volume can be increased, thereby suppressing the pressure increase in the high-pressure side portion of the refrigerant circuit 10, and the load on the compressor 21 can be reduced. The amount can be reduced.

  Furthermore, in the cooling heating apparatus, the size of the evaporator 24 and the internal heat exchanger 31 in the refrigerant circuit 10 may be adjusted to a size that gives priority to the cooling request. That is, if each evaporator 24 is sized to sufficiently cool the internal air of each commodity storage 3 and the size of the internal heat exchanger 31 is determined by the heat balance with these evaporators 24. Good. By doing so, it becomes possible to reduce the size of the internal heat exchanger 31 and further reduce the cost. In particular, if the sizes of the evaporator 24 and the internal heat exchanger 31 in the cooling circuit are determined with priority given to heating requirements, the internal heat exchanger 31 must be made sufficiently large, and therefore each evaporator When the internal air of the product storage case 3 is sufficiently cooled at 24, the load on the expansion mechanism or the like becomes excessive, and as a result, a great cost is required for the configuration of the refrigerant circuit. In addition, when only the internal heat exchanger 31 cannot sufficiently heat the internal air of the left chamber 3c, the internal air of the left chamber 3c is sufficiently heated by driving and heating auxiliary heating means such as a heater. be able to.

  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.

  In the above-described embodiment, the internal heat exchanger 31 is disposed only in the left warehouse 3c. However, the present invention is not limited to this, and the internal heat exchanger is provided inside the intermediate warehouse 3b and the left warehouse 3c. 31 may be provided, and the middle warehouse 3b and the left warehouse 3c may be used as a cooling and heating cabinet. In this case, the volume of the heating path 30 is increased, and the high-pressure side volume of the refrigerant circuit 10 can be further expanded.

DESCRIPTION OF SYMBOLS 10 Refrigerant circuit 20 Cooling path 21 Compressor 22 Condenser 23 Capillary tube 24 Evaporator 25 Refrigerant piping 30 Heating path 31 Internal heat exchanger 32 Gas cooler 33 Branch piping 34 Heat radiation piping 35 Return piping 40 Valve unit 41 Cooling switching valve 42 Heating Switching valve

Claims (1)

A compressor that compresses the refrigerant; a condenser that condenses the refrigerant compressed by the compressor; an expansion mechanism that adiabatically expands the refrigerant condensed by the condenser; and an evaporation that evaporates the refrigerant adiabatically expanded by the expansion mechanism A cooling path configured by sequentially connecting the devices,
A heating path having an internal heat exchanger for introducing and condensing the refrigerant compressed by the compressor, and configured to send the refrigerant condensed by the internal heat exchanger to the expansion mechanism;
When performing the cooling operation, the refrigerant compressed by the compressor is allowed to flow to the condenser and is restricted from flowing to the internal heat exchanger, while when the heat pump operation is performed, A cooling and heating device comprising: a valve unit that restricts the refrigerant compressed by the compressor from flowing to the condenser and allows the refrigerant to flow to the internal heat exchanger;
When performing the cooling operation, the refrigerant that has passed through the condenser is allowed to flow through the internal heat exchanger, while when performing the heat pump operation, the refrigerant that has passed through the internal heat exchanger is A cooling and heating apparatus characterized in that the flow volume of the high-pressure refrigerant is made constant by allowing it to flow to the condenser.

Images