JP2012017913A - Refrigerant circuit device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant circuit device reducing a manufacturing cost by reducing the area covered with a heat insulating material while preventing detention of a refrigerant in heat exchangers under suspension.SOLUTION: The refrigerant circuit device includes: a main path 20 connecting inside heat exchangers 24, a compressor 21 and an outside heat exchanger 22 through refrigerant piping 25; a high-pressure refrigerant introduction path 30 introducing the refrigerant compressed by the compressor 21 and supplying the same to the predetermined inside heat exchangers 24; and a return path 40, 50 returning the refrigerant condensed in the inside heat exchangers 24 to an upstream side of the inside heat exchangers 24 in the main path 20 via a heating side heat exchanger 42. The refrigerant circuit device includes: expansion mechanisms 231, 232, 233 arranged downstream of a merging part with the return path 50 in the main path 20 and upstream of the inside heat exchangers 24, and adiabatically expanding the refrigerant flowing toward the inside heat exchangers 24; and a bypass path 60 introducing the refrigerant passed through the outside heat exchanger 22 when a bypass valve 62 provided in itself is opened, and supplying the same to the right inside heat exchanger 24a.

Description

  The present invention relates to a refrigerant circuit device, and more particularly, to a refrigerant circuit device including a refrigerant circuit having a heat pump function.

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

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

  The high-pressure refrigerant introduction path introduces the refrigerant compressed by the compressor and supplies the refrigerant to the internal heat exchanger disposed in the chamber to be heated, thereby condensing the refrigerant in the internal heat exchanger. . 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 condensed in the internal heat exchanger and supplying it to the heating side heat exchanger. As a result, in the heating side heat exchanger, the refrigerant passing therethrough exchanges heat with the surrounding air to radiate heat.

  A return path | route introduces the refrigerant | coolant thermally radiated with the heating side heat exchanger, and returns it to the upstream of the internal heat exchanger of the said main path | routes. As a result, the refrigerant that has passed through the return path reaches the main path, and then passes through a predetermined internal heat exchanger in the main path and is sent to the compressor.

  In such a refrigerant circuit device, an expansion mechanism is provided in the outlet side pipe of the external heat exchanger in the main path and the downstream side pipe of the junction with the return path. The expansion mechanism depressurizes the refrigerant condensed in the external heat exchanger and adiabatically expands, or depressurizes the refrigerant radiated by the heating side heat exchanger and adiabatically expands.

  In the refrigerant circuit device having the above-described configuration, when only cooling the internal air in each chamber (when performing a single cooling operation), the refrigerant may be circulated only in the main path. That is, the refrigerant compressed by the compressor is condensed by the external heat exchanger, and the condensed refrigerant is adiabatically expanded by the expansion mechanism and evaporated by the internal heat exchanger. The refrigerant evaporated in the internal heat exchanger is sucked by the compressor, compressed again, and circulated. Thereby, the internal air of the chamber in which the internal heat exchanger is disposed is cooled.

  On the other hand, when the internal air of one chamber is cooled and the internal air of another chamber is heated (when cooling and heating operation is performed), the refrigerant is circulated to the main path via the high-pressure introduction path and the return path. Just do it. That is, the refrigerant compressed by the compressor reaches the internal heat exchanger and is condensed by the internal heat exchanger. The condensed refrigerant dissipates heat in the heating side heat exchanger, and is then adiabatically expanded by the expansion mechanism and evaporates in the internal heat exchanger. The refrigerant evaporated in the internal heat exchanger is sucked by the compressor, compressed again, and circulated. As a result, the internal air of the chamber in which the internal heat exchanger that condenses the refrigerant is disposed is heated, while the internal air of the chamber in which the internal heat exchanger that condenses the refrigerant is disposed is cooled. .

  In such a refrigerant circuit device, during operation (during driving of the compressor), an expansion mechanism is disposed on the downstream side of the external heat exchanger or the heating side heat exchanger to maintain the downstream side in a low pressure state. This prevents the so-called stagnation in which the refrigerant stays in the heat exchanger (external heat exchanger or heating side heat exchanger) that is not operating (see, for example, Patent Document 1).

JP 2010-43757 A

  By the way, since a refrigerant | coolant will be in a low temperature low pressure state downstream from an expansion mechanism, it is necessary to cover piping and an apparatus with a heat insulating material so that condensation may not arise in piping and an apparatus downstream from this expansion mechanism. In the refrigerant circuit device described above, an expansion mechanism is disposed on the outlet side of the external heat exchanger and on the downstream side of the heating side heat exchanger, so that the outlets of the external heat exchanger and the heating side heat exchanger are provided. The pipes and the like downstream from the vicinity of the side must be covered with a heat insulating material, and the area covered with the heat insulating material becomes long. As a result, not only the heat insulating material used becomes excessive, but also the manufacturing work takes a long time, resulting in an increase in manufacturing cost.

  In view of the above circumstances, the present invention can reduce the manufacturing cost by reducing the area covered with the heat insulating material while preventing the refrigerant from staying in the heat exchanger that is not operating. An object is to provide a circuit device.

  In order to achieve the above-mentioned object, a refrigerant circuit device according to claim 1 of the present invention sucks the refrigerant that has passed through the internal heat exchanger disposed inside the target chamber and the internal heat exchanger. The main path configured by sequentially connecting the compressor that compresses the refrigerant and the external heat exchanger that condenses the refrigerant compressed by the compressor with refrigerant piping, and the introduction valve provided in itself opens, A high-pressure refrigerant introduction path for introducing the refrigerant compressed by the compressor and condensing the refrigerant in the internal heat exchanger by supplying the internal heat exchanger to the chamber disposed in the chamber to be heated. And a return path for returning the refrigerant condensed in the internal heat exchanger to the upstream side of the internal heat exchanger in the main path through the heating side heat exchanger, the refrigerant circuit device in the main path Downstream of the junction with the return path, and heat exchange in the cabinet An expansion mechanism that adiabatically expands the refrigerant that flows toward the internal heat exchanger, and the refrigerant that has passed through the external heat exchanger when the bypass valve provided therein opens. And a bypass path that supplies a cooling-only internal heat exchanger that evaporates the refrigerant passing through the cooling chamber.

  The refrigerant circuit device according to claim 2 of the present invention is the refrigerant circuit device according to claim 1, wherein the bypass path is a refrigerant pipe between the external heat exchanger and a check valve provided downstream thereof. A bypass pipe arranged in a manner that branches from the middle of the pipe and joins to a predetermined location from the expansion mechanism to the internal heat exchanger dedicated to cooling, A bypass valve is provided that allows the refrigerant to pass through the bypass pipe, and restricts the refrigerant from passing through the bypass pipe when the refrigerant is closed.

  A refrigerant circuit device according to a third aspect of the present invention is the bypass circuit according to the second aspect, wherein the bypass path is disposed in a bypass pipe downstream of the bypass valve and adiabatically expands the refrigerant passing therethrough. An expansion mechanism is provided.

  A refrigerant circuit device according to a fourth aspect of the present invention includes an internal heat exchanger disposed inside a target chamber, and a compressor that sucks and compresses the refrigerant that has passed through the internal heat exchanger. The refrigerant is compressed by the compressor by opening a main path formed by sequentially connecting the external heat exchanger for condensing the refrigerant compressed by the compressor with a refrigerant pipe and an introduction valve provided in itself. And a high-pressure refrigerant introduction path for condensing the refrigerant in the internal heat exchanger by supplying to the internal heat exchanger disposed in the chamber to be heated, and the internal heat A refrigerant circuit device comprising a return path for returning the refrigerant condensed in the exchanger to the upstream side of the internal heat exchanger in the main path through the heating side heat exchanger, and an outlet of the heating side heat exchanger in the return path The refrigerant that is provided in the side pipe and passes through the heating side heat exchanger The pressure reducing mechanism for reducing the pressure to the same level as that of the main path and the return path in the main path, and downstream of the junction, and upstream of the internal heat exchanger, the internal heat exchanger And an expansion mechanism for adiabatic expansion of the refrigerant flowing toward the low temperature and low pressure refrigerant.

  According to the refrigerant circuit device of the present invention, when the bypass valve provided with the bypass path is opened, the refrigerant that has passed through the external heat exchanger is introduced and supplied to the internal heat exchanger dedicated to cooling. Therefore, it is possible to prevent the refrigerant from staying in the external heat exchanger even when the external heat exchanger is at rest. Further, the expansion mechanism is disposed downstream of the junction with the return path in the main path and upstream of the internal heat exchanger, and the refrigerant flowing toward the internal heat exchanger is adiabatically expanded. The region through which the low-temperature and low-pressure state refrigerant passes can be reduced, thereby reducing the region covered with the heat insulating material. Therefore, the manufacturing cost can be reduced by reducing the area covered with the heat insulating material while preventing the refrigerant from staying in the heat exchanger that is not operating.

  Further, according to the refrigerant circuit device of the present invention, the decompression mechanism is provided in the outlet side pipe of the heating side heat exchanger in the return path, and the refrigerant that has passed through the heating side heat exchanger is about the same as the ambient temperature. The refrigerant is decompressed, and the expansion mechanism is disposed downstream of the junction with the return path in the main path and upstream of the internal heat exchanger, and the refrigerant flowing toward the internal heat exchanger is adiabatically expanded. Therefore, the junction with the main path can be at a lower pressure than the outside heat exchanger, and even if the outside heat exchanger is a resting heat exchanger, the outside heat can be reduced. The refrigerant staying in the exchanger can be sucked out in combination with the suction force of the compressor, thereby preventing the refrigerant from staying in the out-of-compartment heat exchanger. In addition, since the refrigerant is only decompressed to the same level as the ambient temperature by the decompression mechanism, it is not necessary to cover a heat insulating material for preventing the occurrence of condensation on the downstream side of the decompression mechanism. Therefore, the manufacturing cost can be reduced by reducing the area covered with the heat insulating material while preventing the refrigerant from staying in the heat exchanger that is not operating.

FIG. 1 is a cross-sectional view showing a case where an internal structure of a vending machine to which the refrigerant circuit device according to Embodiment 1 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 refrigerant circuit device applied to the vending machine shown in FIGS. 1 and 2. FIG. 4 is a conceptual diagram showing a refrigerant flow when the CCC operation is performed in the refrigerant circuit device shown in FIG. 3. FIG. 5 is a conceptual diagram showing the flow of the refrigerant when performing the HCC operation in the refrigerant circuit device shown in FIG. 3. FIG. 6 is a conceptual diagram showing the refrigerant flow when the bypass valve is opened in the HCC operation shown in FIG. FIG. 7 is a conceptual diagram conceptually showing the refrigerant circuit device according to the second embodiment of the present invention. FIG. 8 is a conceptual diagram showing a refrigerant flow when the HCC operation is performed in the refrigerant circuit device shown in FIG. 7.

  Exemplary embodiments of a refrigerant circuit device according to the present invention will be explained below in detail with reference to the accompanying drawings.

<Embodiment 1>
FIG. 1 is a cross-sectional view showing a case where an internal structure of a vending machine to which the refrigerant circuit device according to Embodiment 1 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 them at a desired temperature, and has a heat insulating structure.

  FIG. 2 shows the internal structure of the vending machine shown in FIG. 1 and is a cross-sectional side view of the right product storage case 3. Here, the internal structure of the right product storage 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 the product take-out port 4 a provided in the outer door 4.

  FIG. 3 is a conceptual diagram conceptually showing the refrigerant circuit device applied to the vending machine shown in FIGS. 1 and 2. The refrigerant circuit device illustrated here includes a refrigerant circuit 10 having a main path 20, a high-pressure refrigerant introduction path 30, a first return path 40, and a second return path 50. The refrigerant circuit 10 has a refrigerant (for example, R134a) sealed therein.

  The main path 20 is configured by sequentially connecting a compressor 21, an external heat exchanger 22, and an internal heat exchanger 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 the compressor 21 in the first embodiment, an inverter type that can change the driving rotational speed is applied.

  As shown in FIG. 2, the external heat exchanger 22 is disposed in the machine room 9 similarly to the compressor 21. When the refrigerant | coolant compressed with the compressor 21 passes, this external heat exchanger 22 condenses this refrigerant | coolant.

  A three-way valve 261 is provided in the refrigerant pipe 25 that connects the external heat exchanger 22 and the compressor 21. The three-way valve 261 will be described later.

  A plurality of (three in the illustrated example) heat exchangers 24 in the cabinet are provided, which are disposed in the lower interior of each commodity storage 3 and on the front side of the rear duct D (see FIG. 2). is there. The refrigerant pipe 25 connecting the internal heat exchanger 24 and the external heat exchanger 22 is branched at a first branch point P1 in the middle of the internal heat exchanger 24 and the internal heat exchanger 24 disposed in the right warehouse 3a. On the entrance side of the internal heat exchanger 24 (hereinafter also referred to as the internal heat exchanger 24b) disposed in the internal storage 3b on the entrance side of the right internal heat exchanger 24a (hereinafter also referred to as the internal internal heat exchanger 24b) It is connected to the inlet side of the internal heat exchanger 24 (hereinafter also referred to as the left internal heat exchanger 24c) disposed inside the left warehouse 3c.

  Further, in the refrigerant pipe 25, the inlet-side low-pressure solenoid valve 262a is provided on the way from the first branch point P1 to each of the right internal heat exchanger 24a, the central internal heat exchanger 24b, and the left internal heat exchanger 24c. , 262b, 262c and expansion mechanisms 231, 232, 233 are provided. The inlet-side low-pressure solenoid valves 262a, 262b, 262c are openable and closable valve elements. When an opening command is given from a controller (not shown), the inlet-side low-pressure solenoid valves 262a, 262b, 262c are opened and allowed to pass through the refrigerant. If it is closed, the passage of the refrigerant is restricted. The expansion mechanisms 231, 232, and 233 are, for example, capillary tubes and electronic expansion valves, and adiabatic expansion is performed by reducing the pressure of the refrigerant that passes therethrough.

  The refrigerant piping 25 connected to the outlet side of the internal heat exchanger 24 joins at the first joining point P <b> 2 in the middle, and is connected to the compressor 21 via the accumulator 27. Here, the accumulator 27 is gas-liquid separation means for storing the liquid-phase refrigerant and allowing the gas-phase refrigerant to pass through when the passing refrigerant is a gas-liquid mixed refrigerant. In addition, outlet side low-pressure solenoid valves 263b and 263c are arranged in the middle of the refrigerant pipe 25 from the outlet side of the inner heat exchanger 24b and the left inner heat exchanger 24c to the first junction P2. The outlet-side low-pressure solenoid valves 263b and 263c are valve bodies that can be opened and closed. When the opening command is given from the controller, the outlet-side low-pressure solenoid valves 263b and 263c are opened to allow the refrigerant to pass. It closes and regulates the passage of refrigerant.

  In such a main path 20, reference numeral 28 in FIG. 3 is an internal heat exchanger. The internal heat exchanger 28 exchanges heat between the high-pressure refrigerant and the low-pressure refrigerant.

  The high-pressure refrigerant introduction path 30 is connected to the three-way valve 261 and branches in the middle, one of which is connected to the refrigerant pipe 25 on the inlet side of the internal heat exchanger 24b and the other is the inlet of the left internal heat exchanger 24c. It is the path | route comprised by the high voltage | pressure refrigerant | coolant inlet piping 31 each joined to the refrigerant | coolant piping 25 of the side. The high-pressure refrigerant introduction path 30 is a path for introducing the refrigerant (high-pressure refrigerant) compressed by the compressor 21.

  Here, the three-way valve 261 is a first sending state in which the refrigerant compressed by the compressor 21 is sent to the external heat exchanger 22 and a second sending state in which the refrigerant compressed by the compressor 21 is sent to the high-pressure refrigerant introduction path 30. It is a switching valve that can be switched alternatively between. The switching operation of the three-way valve 261 is performed according to a command given from the controller.

  In the high-pressure refrigerant introduction pipe 31, high-pressure introduction valves 321 and 322 are provided on the downstream side of the branch point, respectively. The high-pressure introduction valves 321 and 322 are valve bodies that can be opened and closed, and are opened when the opening command is given from the controller and allowed to pass through the refrigerant, but are closed when the closing command is given. This restricts the passage of refrigerant.

  That is, when the refrigerant compressed by the compressor 21 is supplied through the high-pressure refrigerant introduction path 30, the inner-compartment heat exchanger 24 b and the left-compartment heat exchanger 24 c It heats the internal air of the product storage 3 (the central storage 3b and the left storage 3c).

  The first return path 40 is branched in the middle of each of the refrigerant pipes 25 connected to the outlet side of the internal heat exchanger 24b and the left internal heat exchanger 24c, and merges at the second junction P3. This is a path constituted by the first return pipe 41 connected to the inlet side of the heating side heat exchanger 42 arranged in a mode adjacent to the external heat exchanger 22. The first return path 40 is for supplying the refrigerant condensed in at least one of the internal heat exchanger 24 b and the left internal heat exchanger 24 c to the heating side heat exchanger 42.

  The heating-side heat exchanger 42 is disposed in a manner adjacent to the external heat exchanger 22 and exchanges heat between the refrigerant passing therethrough and the ambient air. That is, the first return path 40 introduces the refrigerant condensed in the internal heat exchanger 24 and supplies it to the heating side heat exchanger 42.

  From a branch point with the refrigerant pipe 25 connected to the outlet side of the middle return heat exchanger 24b and the left return heat exchanger 24c in the middle of the first return pipe 41 constituting the first return path 40. On the way to the second junction P3, check valves 431 and 432 are provided, respectively.

  The second return path 50 is connected to the outlet side of the heating side heat exchanger 42 and is connected to the refrigerant pipe 25 constituting the main path 20, that is, the external heat exchanger 22 (in the illustrated example, the internal heat exchanger 28). The second return pipe 51 is connected to the third junction P4 of the refrigerant pipe 25 between the first branch point P1. The second return path 50 is for introducing the refrigerant that has passed through the heating side heat exchanger 42 and returning it to the upstream side of the internal heat exchanger 24 in the main path 20.

  Reference numerals 264 and 521 in the figure are check valves. The check valve 264 is provided in the refrigerant pipe 25 connected to the outlet side of the external heat exchanger 22, and the check valve 521 is provided in the second return pipe 51.

  The refrigerant circuit 10 having the above configuration includes a bypass path 60 in addition to the above configuration.

  The bypass path 60 branches from a branch point in the refrigerant pipe 25 on the outlet side of the external heat exchanger 22 from the external heat exchanger 22 to the check valve 264, and is connected to the right internal heat exchanger 24a. The refrigerant pipe 25 connected to the inlet side is constituted by a bypass pipe 61 provided in such a manner that it joins a merging point in the vicinity of the inlet of the right side heat exchanger 24a on the downstream side of the expansion mechanism 231. Such a bypass pipe 61 is provided with a bypass valve 62 and a bypass expansion mechanism 63.

  The bypass valve 62 is a valve body that can be opened and closed. When the opening command is given from the controller, the bypass valve 62 opens and allows the refrigerant to pass, while when the closing command is given, the bypass valve 62 closes and opens the refrigerant. It regulates passage.

  The bypass expansion mechanism 63 is, for example, a capillary tube, and adiabatically expands by reducing the pressure of the refrigerant passing therethrough.

  The refrigerant circuit device having the above-described configuration cools or heats the product stored in the product storage 3 as follows.

  First, the case where CCC operation (operation which cools the internal air of all the goods storage 3) is performed is explained. In this case, the controller gives a drive command to the compressor 21 and causes the three-way valve 261 to be in the first delivery state. Further, the controller gives a close command to the high pressure introduction valves 321 and 322 and the bypass valve 62, and gives an open command to the inlet side low pressure solenoid valves 262a, 262b and 262c and the outlet side low pressure solenoid valves 263b and 263c. 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 three-way valve 261 that is in the first delivery state and reaches the external heat exchanger 22. The refrigerant that has reached the external heat exchanger 22 dissipates heat to the surrounding air (outside air) and condenses while passing through the external heat exchanger 22. The refrigerant condensed in the external heat exchanger 22 branches into three at the first branch point P1 via the internal heat exchanger 28, and then adiabatically expands in the expansion mechanisms 231, 232, 233, respectively, and heat exchange in the right warehouse The heat exchanger 24a, the internal heat exchanger 24b and the left internal heat exchanger 24c, evaporates in each internal heat exchanger 24, takes heat from the internal air of the product storage 3, and cools the internal air . The cooled internal air circulates in the interior by driving each internal blower fan F1, whereby the products stored in each product storage 3 are cooled to the circulating internal air. The refrigerant evaporated in each internal heat exchanger 24 joins at the first joining point P2, and then is sucked into the compressor 21 through the accumulator 27, is compressed by the compressor 21, and repeats the circulation described above.

  In such CCC operation, the heating side heat exchanger 42 is a heat exchanger that is not operating. Then, the refrigerant staying in the heating side heat exchanger 42 due to the suction force of the compressor 21 reaches the main path 20 via the second return pipe 51 and is then sucked into the compressor 21. It is possible to prevent the refrigerant from staying in the heat exchanger 42. In addition, the refrigerant staying upstream of the heating side heat exchanger 42 passes through check valves 431 and 432 provided in the first return pipe 41 and exits from the internal heat exchanger 24 in the main path 20. Since the refrigerant flows into the refrigerant pipe 25 and is then sucked into the compressor 21, it is possible to prevent the refrigerant from staying in the first return path 40.

  Next, the case where the 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 middle warehouse 3b) is described. In this case, the controller gives a drive command to the compressor 21 and causes the three-way valve 261 to enter the second delivery state. Further, the controller gives a closing command to the inlet side low pressure solenoid valve 262c, the outlet side low pressure solenoid valve 263c, the high pressure introduction valve 321 and the bypass valve 62, and the high pressure introduction valve 322, the inlet side low pressure solenoid valves 262a, 262b and the outlet An open command is given to the side low pressure solenoid valve 263b. 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 three-way valve 261 that is in the second delivery state and reaches the left-inside heat exchanger 24c. The refrigerant that has reached the left internal heat exchanger 24c exchanges heat with the internal air of the left internal 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 inside the left warehouse 3c by driving the internal blower fan F1, 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 24c passes through the first return pipe 41 that constitutes the first return path 40, reaches the heating side heat exchanger 42, and is converted into ambient air by the heating side heat exchanger 42. Dissipate heat. The refrigerant radiated by the heating side heat exchanger 42 passes through the second return pipe 51, flows into the main path 20 from the third junction P4, and passes through the inlet side low pressure electromagnetic valves 262a and 262b to be opened. The refrigerant that has passed through the inlet-side low-pressure solenoid valves 262a and 262b is adiabatically expanded by the expansion mechanisms 231 and 232, respectively, and reaches the right internal heat exchanger 24a and the internal heat exchanger 24b, and these right internal heat exchangers. 24a and the internal heat exchanger 24b evaporate to take heat from the internal air of each commodity storage 3, and cool the internal air. The cooled internal air circulates inside each product storage 3 by driving each internal blower fan F1, thereby cooling the products stored in each product storage 3 (right store 3a and middle store 3b). Is done. The refrigerant evaporated in the right internal heat exchanger 24a and the internal internal heat exchanger 24b is sucked into the compressor 21 through the accumulator 27, is compressed by the compressor 21, and repeats the circulation described above.

  In such an HCC operation, if the controller gives an open command to the bypass valve 62 intermittently or continuously for a predetermined time, as shown in FIG. The refrigerant staying in the external heat exchanger 22 as the exchanger flows into the bypass pipe 61 by the suction force of the compressor 21 and adiabatically expands by the bypass expansion mechanism 63 to become a low-temperature and low-pressure refrigerant. The adiabatically expanded refrigerant reaches the main path 20 from the bypass pipe 61 and enters the right internal heat exchanger 24a, which is a heat exchanger dedicated to cooling, and then evaporates. Then, the refrigerant is sucked into the compressor 21 via the accumulator 27. The

  As described above, in the refrigerant circuit device according to the first embodiment, the bypass path 60 cools by introducing the refrigerant that has passed through the external heat exchanger 22 when the bypass valve 62 provided in the bypass path 60 is opened. This is supplied to a dedicated right internal heat exchanger 24a.

  And by opening the bypass valve 62 intermittently or continuously for a predetermined time, the refrigerant in the external heat exchanger 22 that is not operating in the HCC operation can be sucked out from the bypass pipe 61, It is possible to prevent so-called stagnation, in which the refrigerant stays in the external heat exchanger 22.

  According to the refrigerant circuit device according to the first embodiment as described above, the bypass path 60 introduces the refrigerant that has passed through the external heat exchanger 22 when the bypass valve 62 provided in the bypass path 60 is opened. Since the refrigerant is supplied to the right internal heat exchanger 24a dedicated to cooling, it is possible to prevent the refrigerant from staying in the external heat exchanger 22 that is not in operation, and the expansion mechanisms 231, 232, and 233 Since it is provided in the inlet-side refrigerant pipe 25 of the heat exchanger 24, it is possible to reduce the area through which the refrigerant in the low temperature and low pressure state passes, thereby reducing the area covered with the heat insulating material and reducing the manufacturing cost. Can be achieved.

  According to the refrigerant circuit device, since the bypass expansion mechanism 63 adiabatically expands the refrigerant passing through the bypass pipe 61 in the bypass pipe 61 constituting the bypass path 60, the refrigerant supplied from the bypass pipe 61 is in a low temperature and low pressure state. It can be evaporated when passing through the right-side heat exchanger 24a, and the refrigerant sucked out can be effectively used to save energy.

<Embodiment 2>
FIG. 7 is a conceptual diagram conceptually showing the refrigerant circuit device according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to what has the structure similar to Embodiment 1 mentioned above, and the description is abbreviate | omitted. The refrigerant circuit device illustrated here includes a refrigerant circuit 10 ′ having a main path 20, a high-pressure refrigerant introduction path 30, a first return path 40, and a second return path 50 ′. The refrigerant circuit 10 'is filled with a refrigerant (for example, R134a). That is, the refrigerant circuit device according to the second embodiment is different from the refrigerant circuit device according to the first embodiment in that the configuration of the second return path 50 'is different and the bypass path 60 is not provided.

  The second return path 50 'is connected to the outlet side of the heating side heat exchanger 42 and is connected to the refrigerant pipe 25 constituting the main path 20, that is, the external heat exchanger 22 (in the illustrated example, the internal heat exchanger 28). And the second return pipe 51 connected to the third junction P4 of the refrigerant pipe 25 between the first branch point P1 and the first branch point P1. This second return path 50 'is for introducing the refrigerant that has passed through the heating side heat exchanger 42 and returning it to the upstream side of the internal heat exchanger 24 of the main path 20, and a check valve in the middle A pressure reducing mechanism is disposed on the downstream side of H.264. That is, the pressure reducing mechanism 522 is disposed upstream of the third junction P4.

  The decompression mechanism 522 is composed of, for example, a capillary tube or the like, and decompresses the refrigerant that has passed through the heating-side heat exchanger 42 until it reaches the same level as the ambient temperature.

  In the refrigerant circuit device having such a configuration, the case of performing the 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 middle warehouse 3b) will be described. In this case, the controller gives a drive command to the compressor 21 and causes the three-way valve 261 to enter the second delivery state. Further, the controller gives a closing command to the inlet side low pressure solenoid valve 262c, the outlet side low pressure solenoid valve 263c, and the high pressure introduction valve 321, and the high pressure introduction valve 322, the inlet side low pressure solenoid valves 262a and 262b, and the outlet side low pressure solenoid valve An open command is given to 263b. 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 three-way valve 261 that is in the second delivery state and reaches the left-inside heat exchanger 24c. The refrigerant that has reached the left internal heat exchanger 24c exchanges heat with the internal air of the left internal 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 inside the left warehouse 3c by driving the internal blower fan F1, 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 24c passes through the first return pipe 41 that constitutes the first return path 40, reaches the heating side heat exchanger 42, and is converted into ambient air by the heating side heat exchanger 42. Dissipate heat. The refrigerant radiated by the heating side heat exchanger 42 passes through the second return pipe 51 and is decompressed by the decompression mechanism 522 in the middle thereof so as to be approximately equal to the ambient temperature. The decompressed refrigerant flows into the main path 20 from the third junction P4 and passes through the inlet-side low-pressure solenoid valves 262a and 262b that are opened. The refrigerant that has passed through the inlet-side low-pressure solenoid valves 262a and 262b to be opened is adiabatically expanded by the expansion mechanisms 231 and 232, respectively, to reach the right internal heat exchanger 24a and the internal internal heat exchanger 24b. Each of the heat exchangers 24a and the internal heat exchanger 24b evaporates to take heat from the internal air of each commodity storage 3, and cools the internal air. The cooled internal air circulates inside each product storage 3 by driving each internal blower fan F1, thereby cooling the products stored in each product storage 3 (right store 3a and middle store 3b). Is done. The refrigerant evaporated in the right internal heat exchanger 24a and the internal internal heat exchanger 24b is sucked into the compressor 21 through the accumulator 27, is compressed by the compressor 21, and repeats the circulation described above.

  When performing such an HCC operation, the suction force of the compressor 21 and the third junction P4 become a passage region for the refrigerant decompressed by the decompression mechanism 522 and have a lower pressure than the external heat exchanger 22. Therefore, in the HCC operation, the refrigerant that has accumulated in the external heat exchanger 22 that is a heat exchanger that is not operating is opened through the internal heat exchanger 28 and the first branch point P1, and the inlet-side low-pressure solenoid valves 262a and 262b The downstream expansion mechanisms 231 and 232 are reached. The refrigerant reaching the expansion mechanisms 231 and 232 adiabatically expands to a low temperature and low pressure state, reaches the right internal heat exchanger 24a and the internal heat exchanger 24b, and the right internal heat exchanger 24a and the internal heat exchanger 24a. Each of the heat exchangers 24b evaporates to take heat from the internal air of each commodity storage 3, and cools the internal air. The refrigerant evaporated in the right internal heat exchanger 24 a and the internal internal heat exchanger 24 b is sucked into the compressor 21 via the accumulator 27.

  Thereby, it can prevent that a refrigerant | coolant retains in the external heat exchanger 22 in a stop. In addition, since the refrigerant is only decompressed to the same level as the ambient temperature by the decompression mechanism 522, it is not necessary to cover the heat insulating material for preventing the occurrence of condensation on the downstream side of the decompression mechanism 522, and the first embodiment described above. Similarly, only the downstream side of the expansion mechanisms 231, 232, and 233 is required. Thereby, the area | region covered with a heat insulating material can be reduced, and reduction of manufacturing cost can be aimed at.

  Therefore, according to the refrigerant circuit device according to the second embodiment, the manufacturing cost can be reduced by reducing the area covered with the heat insulating material while preventing the refrigerant from staying in the heat exchanger that is not operating. Can be achieved.

  The preferred embodiment 1 and embodiment 2 of the present invention have been described above, but the present invention is not limited to this, and various modifications can be made.

  In Embodiment 1 mentioned above, the bypass piping 61 which comprises the bypass path | route 60 merges in the confluence | merging point of the inlet side refrigerant | coolant piping 25 of the right side internal heat exchanger 24a near the entrance of this right side internal heat exchanger 24a. However, in the present invention, the bypass pipe constituting the bypass path may be provided so as to join between the expansion mechanism and the internal heat exchanger dedicated to cooling. More specifically, the bypass pipe may be provided so as to be connected to a heat exchanger dedicated to cooling.

  In the first embodiment described above, the bypass expansion mechanism 63 is provided in the bypass pipe 61. However, in the present invention, the bypass expansion mechanism is not an essential component and is not provided in the bypass pipe. It doesn't matter.

  Moreover, in Embodiment 1 and Embodiment 2 mentioned above, although the internal heat exchanger 28 was provided, in this invention, an internal heat exchanger may not be provided.

  Moreover, in Embodiment 1 and Embodiment 2 mentioned above, although the flow of the refrigerant | coolant in the case where CCC operation is performed and the case where HCC operation is performed was described, Even when heating and cooling the internal air of the right warehouse 3a), it is possible to prevent the refrigerant from staying in the external heat exchanger 22 by opening the bypass valve 62.

  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 plastic bottled beverages.

DESCRIPTION OF SYMBOLS 1 Main body cabinet 10 Refrigerant circuit 20 Main path 21 Compressor 22 External heat exchanger 231 Expansion mechanism 232 Expansion mechanism 233 Expansion mechanism 24 Internal heat exchanger 24a Right internal heat exchanger 24b Central internal heat exchanger 24c Left warehouse Internal heat exchanger 25 Refrigerant piping 261 Three-way valve 262a Inlet side low pressure solenoid valve 262b Inlet side low pressure solenoid valve 262c Inlet side low pressure solenoid valve 263b Outlet side low pressure solenoid valve 263c Outlet side low pressure solenoid valve 30 High pressure refrigerant introduction path 31 High pressure refrigerant introduction pipe 321 High-pressure introduction valve 322 High-pressure introduction valve 40 First return path 41 First return pipe 42 Heating side heat exchanger 50 Second return path 51 Second return pipe 60 Bypass path 61 Bypass pipe 62 Bypass valve 63 Bypass expansion mechanism

Claims (4)

An internal heat exchanger disposed inside the target chamber, a compressor that sucks and compresses the refrigerant that has passed through the internal heat exchanger, and external heat exchange that condenses the refrigerant compressed by the compressor A main path configured by sequentially connecting the vessel with refrigerant piping,
When the introduction valve provided in itself opens, the refrigerant compressed by the compressor is introduced and supplied to the internal heat exchanger disposed in the chamber to be heated. A high-pressure refrigerant introduction path for condensing the refrigerant in the internal heat exchanger;
In the refrigerant circuit device comprising: a return path for returning the refrigerant condensed in the internal heat exchanger to the upstream side of the internal heat exchanger in the main path through the heating side heat exchanger;
An expansion mechanism that is disposed downstream of the junction with the return path in the main path and upstream of the internal heat exchanger, and adiabatically expands the refrigerant flowing toward the internal heat exchanger; ,
A bypass path for supplying a cooling internal heat exchanger for introducing a refrigerant that has passed through the external heat exchanger when the bypass valve provided therein is opened, and evaporating the refrigerant passing through the internal heat exchanger. A refrigerant circuit device comprising: The bypass path is
Branches from the middle of the refrigerant piping between the external heat exchanger and a check valve provided downstream thereof, and joins a predetermined location from the expansion mechanism to the internal heat exchanger dedicated to cooling. Bypass piping arranged in a mode;
A bypass valve that is disposed in the bypass pipe and allows the refrigerant to pass through the bypass pipe when opened, and restricts the refrigerant from passing through the bypass pipe when closed. The refrigerant circuit device according to claim 1.   The refrigerant circuit device according to claim 2, wherein the bypass path includes a bypass expansion mechanism that is disposed in a bypass pipe downstream of the bypass valve and adiabatically expands the refrigerant that passes therethrough. An internal heat exchanger disposed inside the target chamber, a compressor that sucks and compresses the refrigerant that has passed through the internal heat exchanger, and external heat exchange that condenses the refrigerant compressed by the compressor A main path configured by sequentially connecting the vessel with refrigerant piping,
When the introduction valve provided in itself opens, the refrigerant compressed by the compressor is introduced and supplied to the internal heat exchanger disposed in the chamber to be heated. A high-pressure refrigerant introduction path for condensing the refrigerant in the internal heat exchanger;
In the refrigerant circuit device comprising: a return path for returning the refrigerant condensed in the internal heat exchanger to the upstream side of the internal heat exchanger in the main path through the heating side heat exchanger;
A pressure reducing mechanism that is provided in an outlet side pipe of the heating side heat exchanger in the return path, and depressurizes the refrigerant that has passed through the heating side heat exchanger until it becomes approximately the same as the ambient temperature;
The main path is arranged downstream of the junction with the return path and upstream of the internal heat exchanger, and the refrigerant flowing toward the internal heat exchanger is adiabatically expanded to a low temperature and low pressure A refrigerant circuit device comprising: an expansion mechanism for causing the refrigerant to flow.

Images