JP2010159896A - Refrigerant circuit device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerant circuit device capable of suppressing clogging of a refrigerant in an expanding mechanism and the like and improving heat exchanging efficiency by properly removing foreign matters even in a refrigerant circuit having a function as a heat pump. <P>SOLUTION: This refrigerant circuit device including a main circuit 20 constituted by successively connecting inner heat exchangers 24, a compressor 21 and an outer heat exchanger 22, a branched introduction pathway 30 to which the compressed refrigerant is branched and introduced to be supplied to the indoor heat exchanger 24 disposed in a room to be heated, a radiation pathway 40 to which the refrigerant condensed by the inner heat exchanger 24 is introduced to supply the refrigerant to a gas cooler 41, a return pathway 50 for returning the refrigerant radiating heat at the gas cooler 41 to the main circuit 20, and a second capillary tube 52 for adiabatic expansion of the refrigerant radiating heat at the gas cooler 41, further includes a second strainer S2 disposed in a passing region of the refrigerant supplied to the second capillary tube 52 for removing foreign matters mixed in the refrigerant. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a refrigerant circuit device, and more particularly to a refrigerant circuit device applied to, for example, a vending machine.

  Conventionally, as a refrigerant circuit device applied to, for example, a vending machine or the like, an internal heat exchanger, a compressor, an external heat exchanger, and an expansion mechanism are sequentially connected by a refrigerant pipe and have an annularly configured refrigerant circuit. Things are known.

  The in-compartment heat exchanger is disposed inside the commodity storage of the vending machine. This internal heat exchanger cools the internal air of a product storage, for example, when the passing refrigerant evaporates.

  The compressor is disposed inside the vending machine main body and outside the commodity storage, for example, in the machine room, and sucks the refrigerant evaporated by the internal heat exchanger and compresses the sucked refrigerant. Thus, the liquid is discharged in a high temperature and high pressure state.

  The external heat exchanger is disposed in a place (machine room or the like) inside the vending machine main body and outside the commodity storage box like the compressor. This external heat exchanger heats ambient air, that is, dissipates heat to the ambient air, as the passing refrigerant condenses.

  Like the compressor and the external heat exchanger, the expansion mechanism is disposed in a place (machine room or the like) inside the vending machine main body and outside the commodity storage. This expansion mechanism is for depressurizing and adiabatically expanding the refrigerant condensed in the external heat exchanger.

  In such a refrigerant circuit, 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. As a result, the internal air of the commodity storage in which the internal heat exchanger is disposed is cooled.

  And in such a refrigerant circuit, the foreign material and water | moisture content which a refrigerant | coolant mixes in the passage area of the refrigerant | coolant condensed with the external heat exchanger, ie, the refrigerant | coolant piping between an external heat exchanger and an expansion mechanism, are removed. For example, a strainer is provided (see, for example, Patent Document 1).

JP-A-5-258164

  Incidentally, in recent years, a refrigerant circuit device including a refrigerant circuit having a function as a heat pump is known. That is, a refrigerant in which a branch introduction path, a heat radiation path, and a return path are connected to a main circuit configured in an annular shape by sequentially connecting an internal heat exchanger, a compressor, an external heat exchanger, and an expansion mechanism with refrigerant piping. It has a circuit.

  The branch introduction path branches and introduces the refrigerant compressed by the compressor, supplies the refrigerant introduced into the chamber heat exchanger that constitutes the main circuit and is disposed in the chamber to be heated, The refrigerant is condensed in the internal heat exchanger to heat the internal atmosphere of the chamber. The heat dissipation path is for introducing the refrigerant condensed in the internal heat exchanger and supplying the refrigerant to the gas cooler, and heat-exchanging the refrigerant with ambient air in the gas cooler. The return path is for introducing the refrigerant dissipated by the gas cooler and returning it upstream of the internal heat exchanger of the main circuit.

  Also in the refrigerant circuit device including the refrigerant circuit having a function as such a heat pump, it is preferable that a strainer is provided in order to remove foreign matters and the like. Therefore, when the strainer proposed in Patent Document 1 described above is applied, foreign substances and moisture can be removed from the refrigerant passing through the main circuit, that is, the refrigerant condensed in the external heat exchanger. When the refrigerant is allowed to pass through the introduction path, the heat radiation path, and the return path, foreign matter or the like cannot be removed from the refrigerant, and as a result, there is a risk of clogging of the refrigerant in the expansion mechanism or the like, and the heat exchange efficiency is increased. It had caused a decline.

  In view of the above circumstances, the present invention can suppress the clogging of refrigerant in an expansion mechanism or the like and improve the heat exchange efficiency by removing foreign matters well even in a refrigerant circuit having a function as a heat pump. An object is to provide a refrigerant circuit device.

  In order to achieve the above object, a refrigerant circuit device according to claim 1 of the present invention is disposed in a target chamber and evaporates the supplied refrigerant to cool the internal atmosphere of the chamber. Refrigerant piping includes an exchanger, a compressor that sucks and compresses the refrigerant evaporated in the internal heat exchanger, and an external heat exchanger that introduces and condenses the refrigerant compressed by the compressor. The main circuit configured by sequentially connecting and the refrigerant compressed by the compressor are branched and introduced, and the refrigerant introduced into the chamber heat exchanger disposed in the chamber to be heated is supplied. And a branch introduction path for condensing the refrigerant in the internal heat exchanger to heat the internal atmosphere of the chamber, and introducing the refrigerant condensed in the internal heat exchanger and supplying it to the gas cooler. A heat dissipation path for dissipating heat by exchanging heat between the refrigerant and ambient air, and the gas cooler. Adiabatic expansion of at least one of the return path for introducing the radiated refrigerant and returning it to the upstream side of the internal heat exchanger of the main circuit, the refrigerant condensed by the external heat exchanger, and the refrigerant radiated by the gas cooler And a refrigerant circuit device comprising an expansion mechanism for delivering the adiabatic and expanded refrigerant to the internal heat exchanger, the refrigerant circuit device being disposed in a passage area of the refrigerant supplied to the expansion mechanism, and A foreign matter removing member for removing foreign matter to be mixed is provided.

  The refrigerant circuit device according to claim 2 of the present invention is the moisture circuit for removing moisture in the passage region of the refrigerant condensed in the external heat exchanger and sent to the expansion mechanism in claim 1 described above. A removing member is provided.

  The refrigerant circuit device according to claim 3 of the present invention is the refrigerant circuit device according to claim 1 and claim 2, wherein the expansion mechanism is disposed downstream of the external heat exchanger in the main circuit, A first capillary tube that adiabatically expands the refrigerant condensed in the external heat exchanger, and a second capillary that is disposed downstream of the gas cooler in the second refrigerant circuit and adiabatically expands the refrigerant radiated by the gas cooler. The foreign substance removing member is provided between the gas cooler and the second capillary tube.

  Further, the refrigerant circuit device according to claim 4 of the present invention is the removal for performing moisture removal and foreign matter removal between the outside heat exchanger and the first capillary tube in claim 3 described above. A member is provided.

  According to the refrigerant circuit device of the present invention, the foreign substance removing member is disposed in the passage region of the refrigerant supplied to the expansion mechanism and removes the foreign substance mixed in the refrigerant. Therefore, the refrigerant circuit having a function as a heat pump. Also, in this case, it is possible to suppress the clogging of the refrigerant in the expansion mechanism and to improve the heat exchange efficiency by properly removing the foreign matter.

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

  FIG. 1 is a sectional view showing a case where an internal structure of a vending machine to which a refrigerant circuit device according to an embodiment of the present invention is applied is viewed from the front. The vending machine 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 (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 ( Hereinafter, the internal structure of the left warehouse 3c is also substantially the same as that of the right warehouse 3a. In the present specification, the right side indicates the right side when the vending machine is viewed from the front, and the left side indicates the left side when the vending machine is viewed from the front.

  As shown in FIG. 2, an outer door 4 and an inner door 5 are provided on the front surface of the main body cabinet 1. The outer door 4 is for opening and closing the front opening of the main body cabinet 1, and the inner door 5 is for opening and closing the front surface of the commodity storage 3. The inner door 5 is divided into upper and lower parts, and the upper door 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 according to the embodiment of the present invention. The refrigerant circuit device illustrated here includes a refrigerant circuit 10 including a main circuit 20, a branch introduction path 30, a heat radiation path 40, and a return path 50.

  The main circuit 20 is configured by sequentially connecting a compressor 21, an external heat exchanger 22, a first capillary tube 23, and an internal heat exchanger 24 through a refrigerant pipe 25, and a refrigerant (for example, R134a) therein. 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 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 external heat exchanger 22 is disposed in the machine room 9 similarly to the compressor 21. This external heat exchanger 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.

  The refrigerant pipe 25 connecting the external heat exchanger 22 and the compressor 21 is provided with a high-pressure side electromagnetic valve 261. The high-pressure side electromagnetic valve 261 is a valve body that can be opened and closed. When the opening command is given from a control unit (not shown), the high-pressure side electromagnetic valve 261 opens and permits the passage of the refrigerant, while when the closing command is given. Is closed to restrict the passage of refrigerant.

  As shown in FIG. 2, the first capillary tube 23 is disposed in the machine room 9 similarly to the compressor 21 and the external heat exchanger 22. The first capillary tube 23 is for adiabatic expansion by reducing the pressure of the refrigerant passing therethrough.

  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 structure of the internal heat exchanger 24 will be described later.

  The refrigerant pipe 25 connecting the internal heat exchanger 24 and the first capillary tube 23 is branched into three by a distributor 27 disposed in the middle thereof, and the internal heat disposed in the right warehouse 3a. On the inlet side of the exchanger 24 (hereinafter also referred to as the right internal heat exchanger 24a), the inlet of the internal heat exchanger 24 (hereinafter also referred to as the internal heat exchanger 24b) disposed in the intermediate 3b. 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 is connected to each side. The configuration of the distributor 27 will be described later.

  Moreover, in this refrigerant | coolant piping 25, low pressure side solenoid valve 262,263, on the way from the divider | distributor 27 to each of the right side heat exchanger 24a, the center internal heat exchanger 24b, and the left side heat exchanger 24c. H.264 is provided. The low pressure side solenoid valves 262, 263, and 264 are openable and closable valve elements, which are opened when an opening command is given from the control unit and allow passage of the refrigerant, while when a closing command is given. Is closed to restrict the passage of refrigerant.

  Refrigerant piping 25 connected to the outlet side of the internal heat exchanger 24b and the left internal heat exchanger 24c merges at the first junction P1 on the way, and further to the outlet side of the right internal heat exchanger 24a. The connected refrigerant pipe 25 joins at the second joining point P <b> 2 and is connected to the compressor 21 via the accumulator 28. Here, the accumulator 28 is for storing the liquid-phase refrigerant and allowing the gas-phase refrigerant to pass through when the refrigerant passing therethrough is a gas-liquid mixed refrigerant.

  In the refrigerant pipe 25 connected to the outlet side of the internal heat exchanger 24b and the left internal heat exchanger 24c, return solenoid valves 265 and 266 are arranged upstream of the first junction P1, respectively. is there. The return solenoid valves 265 and 266 are valve bodies that can be opened and closed. When an opening command is given from a control unit (not shown), the feedback solenoid valves 265 and 266 are opened to allow passage of the refrigerant, while being given a closing command. In such a case, it is closed to restrict the passage of the refrigerant.

  The branch introduction path 30 branches from a high pressure side branch point P3 in the middle of the path between the compressor 21 and the high pressure side solenoid valve 261, and further branches in the middle, one side being the inlet side of the internal heat exchanger 24b. The other is a path constituted by a branch pipe 31 that joins the refrigerant pipe 25 and the other refrigerant pipe 25 on the inlet side of the left-side internal heat exchanger 24c. The branch introduction path 30 is a path for introducing the refrigerant (high-pressure refrigerant) compressed by the compressor 21. Here, in the refrigerant pipes 25 on the inlet side of the internal heat exchanger 24b and the left internal heat exchanger 24c, a path on the upstream side of the junction with each branch pipe 31 (each branch introduction path 30), That is, check valves 267 and 268 are provided in the path between each junction and the low pressure side solenoid valves 263 and 264 located upstream thereof.

  In the branch introduction path 30, branch solenoid valves 321 and 322 are provided on the downstream side of the branch point, respectively. The branch solenoid valves 321 and 322 are valve bodies that can be opened and closed. When the opening command is given from the control unit, the branch solenoid valves 321 and 322 are opened to allow the passage of the refrigerant, whereas when the closing command is given, the branch electromagnetic valves 321 and 322 are closed. Thus, the passage of the refrigerant is restricted.

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

  The heat radiation path 40 is branched in the middle of each of the refrigerant pipes 25 connected to the outlet side of the inner heat exchanger 24b and the left heat exchanger 24c, and merges at the third junction P4. This is a path constituted by a heat radiation pipe connected to the inlet side of the gas cooler 41 arranged in a manner adjacent to the exchanger 22. The heat dissipation path 40 is for supplying the gas cooler 41 with the refrigerant condensed in at least one of the internal heat exchanger 24b and the left internal heat exchanger 24c. In the gas cooler 41 to which the refrigerant is supplied through the heat radiation path 40, heat exchange is performed between the refrigerant and the ambient air, and the refrigerant radiates heat. That is, the heat radiation path 40 introduces the refrigerant condensed in the internal heat exchanger 24 and supplies the refrigerant to the gas cooler 41, and the gas cooler 41 exchanges heat with ambient air to dissipate heat.

  The third junction from the branch point of the refrigerant pipe 25 connected to the outlet side of the heat exchanger 24b and the left heat exchanger 24c in the middle of the heat radiation pipe 42 constituting the heat radiation path 40. On the way to P4, check valves 431 and 432 are provided, respectively.

  The return path 50 is connected to the outlet side of the gas cooler 41, and is connected to the refrigerant pipe 25 constituting the main circuit 20, that is, the fourth junction P5 of the refrigerant pipe 25 between the first capillary tube 23 and the distributor 27. It is the path | route comprised by the return piping 51 to do.

  A second capillary tube 52 is provided in the middle of the return pipe 51 constituting the return path 50. The second capillary tube 52 is for adiabatic expansion by reducing the pressure of the refrigerant passing therethrough.

  In the refrigerant circuit 10, three strainers, that is, a first strainer S1, a second strainer S2, and a third strainer S3 are arranged. The first strainer S <b> 1 is disposed in the refrigerant pipe 25 between the external heat exchanger 22 and the first capillary tube 23 in the main circuit 20. The first strainer S1 has a desiccant for removing moisture and a filter for removing foreign matter, and removes moisture from the refrigerant passing through the refrigerant pipe 25 and removes foreign matter. It is the removal member to perform.

  The second strainer S <b> 2 is disposed in the return pipe 51 in the return path 50, that is, the return pipe 51 between the gas cooler 41 and the second capillary tube 52. The second strainer S2 has a filter for removing foreign matter, and is a foreign matter removing member that only removes foreign matter from the refrigerant passing through the refrigerant pipe 25.

  The third strainer S3 is disposed in the refrigerant pipe 25 on the discharge port side of the compressor 21 in the main circuit 20. The third strainer S3 has a filter for removing foreign matter, and is a foreign matter removing member that removes foreign matter from the refrigerant passing through the refrigerant pipe 25. In the present embodiment, the third strainer S3 is also disposed in the refrigerant pipe 25 connected to the discharge port side of the compressor 21, but such a strainer is not essential, and the application conditions of the refrigerant circuit device, etc. Depending on the situation, it may be installed as appropriate.

  The distributor 27 constituting the refrigerant circuit 10 is provided on the downstream side of the first capillary tube 23 and the second capillary tube 52, and the refrigerant adiabatically expanded in the first capillary tube 23 or the second capillary tube. The refrigerant adiabatically expanded at 52 is branched.

  In such a distributor 27, as shown in FIG. 4, the introduction opening 271 serving as the refrigerant inlet is located on the lower side, while the branch openings 272 serving as the refrigerant outlet are located above the introduction opening 271 respectively. Yes. The height levels of the branch openings 272 are substantially the same.

  As shown in FIGS. 5 to 9, the internal heat exchanger 24 (the right internal heat exchanger 24a, the internal internal heat exchanger 24b, and the left internal heat exchanger 24c) includes a heat transfer tube 241 and a fin member. 242 and a closing member 243 are provided.

  The heat transfer tube 241 is bent in a meandering manner, and constitutes a refrigerant flow path. The fin members 242 are arranged in parallel between a pair of side plates 244 arranged in a manner of being inserted into the heat transfer tubes 241. Here, as shown in FIG. 6, the pair of side plates 244 are formed with holes 245 for inserting the heat transfer tubes 241, and the heat transfer tubes 241 are inserted through the holes 245. Even after 241 is inserted, an opening 245a is formed by the hole 245.

  The closing member 243 is for closing the hole 245 formed in the side plate 244. More specifically, as shown in FIG. 7, a plate-like member made of a resin material is formed with a through hole 243a and a slit 243b. The through hole 243a allows the heat transfer tube 241 to pass therethrough, and has an inner diameter slightly larger than the outer diameter of the heat transfer tube 241. The slit 243b connects adjacent through holes 243a. Further, engagement grooves 243c are formed at portions corresponding to the inlet and outlet of the heat transfer tube 241.

  As shown in FIG. 8, the closing member 243 is disposed on the outer peripheral surface of the side plate 244 such that the heat transfer tube 241 passes through the through hole 243 a. With the closing member 243, the opening 245a of the hole 245 of the side plate 244 is closed.

  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 branch solenoid valves 321 and 322 are closed, and the high-pressure side solenoid valve 261, the low-pressure side solenoid valves 262, 263, and 264 and the feedback solenoid valves 265 and 266 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 passes through the high-pressure side electromagnetic valve 261 to be opened 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 passes through the first strainer S <b> 1 to remove moisture and foreign matter, and then adiabatically expands in the first capillary tube 23.

  The refrigerant adiabatically expanded and vaporized by the first capillary tube 23 is branched into three by the distributor 27, and reaches the right internal heat exchanger 24a, the central internal heat exchanger 24b, and the left internal heat exchanger 24c. Then, each of the internal heat exchangers 24 evaporates and takes heat from the internal air of the product storage 3 to cool the internal air. The cooled internal air circulates in the interior by driving each internal blower fan, 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 is gas-liquid separated by the accumulator 28, and then the gas phase portion is sucked into the compressor 21 and compressed by the compressor 21 to repeat the above-described circulation.

  Next, the case where 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) is described. In this case, the high pressure side solenoid valve 261, the low pressure side solenoid valves 263, 264, and the feedback solenoid valves 265, 266 are closed, and the branch solenoid valves 321, 322 and the low pressure side solenoid valve 262 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 passes through the branch introduction path 30 and reaches the internal heat exchanger 24b and the left internal heat exchanger 24c. The refrigerant that has reached the internal heat exchanger 24b and the left internal heat exchanger 24c exchanges heat with the internal air of the intermediate 3b and the left internal 3c while passing through the heat exchanger. It dissipates heat and condenses. Thereby, the internal air of the inner warehouse 3b and the left warehouse 3c is heated. The heated internal air circulates in each of the inner warehouse 3b and the left warehouse 3c by driving an internal blower fan (not shown), whereby each product storage 3 (the middle warehouse 3b and the left warehouse 3c) is circulated. The accommodated goods are heated to the circulating internal air.

  The refrigerant condensed in the internal heat exchanger 24b and the left internal heat exchanger 24c passes through the heat radiation pipe 42 constituting the heat radiation path 40 to reach the gas cooler 41 and radiates heat to the surrounding air by the gas cooler 41. The refrigerant radiated by the gas cooler 41 passes through the second strainer S <b> 2 to remove foreign matter, and then adiabatically expands in the second capillary tube 52.

  The refrigerant vaporized by adiabatic expansion in the second capillary tube 52 passes through the low pressure side electromagnetic valve 262 opened via the distributor 27 and reaches the right internal heat exchanger 24a, and this right internal heat exchanger. It evaporates at 24a and takes heat from the internal air of the right case 3a to cool the internal air. The cooled internal air circulates in the right case 3a by driving the right internal blower fan F1 (see FIG. 2), thereby cooling the product accommodated in the right case 3a. After the refrigerant evaporated in the right-side heat exchanger 24a is gas-liquid separated by the accumulator 28, the gas phase portion is sucked into the compressor 21 and compressed by the compressor 21, and the above-described circulation is repeated. Thus, the refrigerant circuit 10 has a function as a heat pump.

  As described above, according to the refrigerant circuit device in the present embodiment, the first strainer S1 disposed in the refrigerant pipe 25 between the external heat exchanger 22 and the first capillary tube 23 in the main circuit 20 is provided. The second strainer S2 that removes foreign matters and moisture mixed in the refrigerant condensed in the external heat exchanger and is disposed in the return pipe 51 (return path 50) between the gas cooler 41 and the second capillary tube 52 is provided. The foreign matter mixed in the refrigerant radiated by the gas cooler 41 is removed, that is, the foreign matter mixed in the refrigerant by the strainer disposed in the passage region of the refrigerant supplied to the first capillary tube 23 and the second capillary tube 52. Therefore, not only in the cooling operation (CCC operation) in which the refrigerant is circulated only in the main circuit 20, but also in the branch introduction path 30, the heat radiation path 40 and In the case of heating operation circulating a coolant (e.g. HHC operation) to return path 50, the removal of the foreign matter is possible by the strainer. Thereby, generation | occurrence | production of the refrigerant | coolant clogging in the 1st capillary tube 23 or the 2nd capillary tube 52 can be suppressed, the circulation amount of the refrigerant | coolant in the refrigerant circuit 10 can be made into a desired magnitude | size, the internal heat exchanger 24 or The heat exchange efficiency in the external heat exchanger 22 or the gas cooler 41 can be improved. Therefore, even in the refrigerant circuit 10 having a function as a heat pump, it is possible to suppress the clogging of the refrigerant in the first capillary tube 23 and the second capillary tube 52 and to improve the heat exchange efficiency by removing foreign matters satisfactorily. it can.

  According to the refrigerant circuit device, the first strainer S1 removes moisture mixed in the refrigerant passing through and the refrigerant condensed in the external heat exchanger 22, so that moisture remaining in the piping of the refrigerant circuit 10 is frozen. Thus, the cross-sectional area of the piping of the refrigerant circuit 10 can be reduced, and the occurrence of clogging of the refrigerant can be suppressed. Also by this, the heat exchange efficiency in the internal heat exchanger 24 can be made favorable.

  Further, according to the refrigerant circuit device, the distributor 27 is disposed on the downstream side of the first capillary tube 23 and the second capillary tube 52, and the introduction opening (refrigerant inlet) 271 is located on the lower side, Since the branch openings (refrigerant outlets) 272 are respectively located above the introduction openings 271 and the height levels thereof are substantially the same, the refrigerant passing through the distributor 27 can be passed through the first capillary tube 23 or The second capillary tube 52 is adiabatically expanded and vaporized. Therefore, it is possible to distribute the refrigerant uniformly because the height levels of the branch openings 272 are substantially the same without being affected by gravity or the like. In particular, since the vaporized refrigerant is distributed, it is not necessary to make the height of the branch opening 272 exactly equal to that of the liquid phase refrigerant. Therefore, the present invention can be applied well to vending machines that are not necessarily installed at horizontal locations, and the refrigerant can be evenly distributed to the internal heat exchangers 24.

  Further, the introduction opening 271 of the distributor 27 is located on the lower side and the branch opening 272 is located on the upper side, whereby the height level at which the low pressure side solenoid valves 262, 263, and 264 are disposed is defined. In addition, the distributor 27 can be installed below the low pressure side solenoid valves 262, 263, and 264, and the vertical dimension can be determined based on the height of the low pressure side solenoid valves 262, 263, and 264. By reducing the size, the arrangement volume can be reduced.

  Furthermore, according to the refrigerant circuit device, since the closing member 243 constituting the internal heat exchanger 24 closes the hole 245 formed in the side plate 244, the air out of the air passing through the internal heat exchanger 24 The amount of air flowing to the surroundings through the holes 245 is reduced, and as a result, the amount of air passing through the back duct D and between the fin members 242 of the internal heat exchanger 24 can be increased. Therefore, the amount of air passing between the fin members 242 can be increased to improve the heat exchange efficiency.

  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 embodiment described above, the expansion mechanism is configured by the first capillary tube 23 that adiabatically expands the refrigerant condensed in the external heat exchanger and the second capillary tube 52 that adiabatically expands the refrigerant condensed in the gas cooler 41. However, in the present invention, a common expansion mechanism that adiabatically expands the refrigerant condensed by the external heat exchanger and the refrigerant radiated by the gas cooler may be used.

  In the embodiment described above, the first strainer S1 for removing moisture and removing foreign matter is disposed upstream of the first capillary tube 23, and the second strainer S2 for performing only foreign matter removal is disposed upstream of the second capillary tube 52. However, in the present invention, it is only necessary that the foreign matter removing member is disposed on the upstream side of the expansion mechanism, that is, in the passage region of the refrigerant supplied to the expansion mechanism. In particular, in this case, it is preferable that a moisture removing member that only removes moisture is disposed in the passage region of the refrigerant condensed in the external heat exchanger.

  In the embodiment described above, the closing member 243 is obtained by processing a plate-like member made of a resin material. However, the present invention is not limited to the plate-like member, and is constituted by a cushion material or the like. It doesn't matter. Moreover, the through-holes and slits formed in the plate-like member are examples, and slits other than the patterns exemplified in the above-described embodiments may be formed.

It is sectional drawing which shows the case where the internal structure of the vending machine to which the refrigerant circuit apparatus which is embodiment of this invention is applied is seen from the front. FIG. 2 is a cross-sectional side view of the right product storage case 3 showing the internal structure of the vending machine shown in FIG. 1. It is a conceptual diagram which shows notionally the refrigerant circuit apparatus which is embodiment of this invention. It is a perspective view which shows the structure of the divider | distributor shown in FIG. It is a schematic diagram which shows typically the structure of the internal heat exchanger shown in FIG. It is a perspective view which shows the principal part of the internal heat exchanger shown in FIG. It is a schematic diagram which shows typically attachment of the obstruction | occlusion member. It is a perspective view which shows the state which attached the closure member to the principal part of the internal heat exchanger shown in FIG. It is a conceptual diagram which shows notionally the flow of the refrigerant | coolant in the refrigerant circuit in the case of performing CCC driving | operation. It is a conceptual diagram which shows notionally the flow of the refrigerant | coolant in the refrigerant circuit in the case of performing HHC operation.

DESCRIPTION OF SYMBOLS 10 Refrigerant circuit 20 Main circuit 21 Compressor 22 External heat exchanger 23 1st capillary tube 24 Internal heat exchanger 241 Heat exchanger tube 242 Fin member 243 Closure member 243a Through hole 243b Slit 243c Engaging groove 244 Side plate 245 Hole 245a Opening 25 refrigerant pipe 27 distributor 271 introduction opening 272 branch opening 30 branch introduction path 31 branch pipe 40 heat radiation path 41 gas cooler 42 heat radiation pipe 50 return path 51 return path 52 second capillary tube D rear duct F1 right internal blower fan S1 first Strainer S2 2nd strainer S3 3rd strainer

Claims (4)

An internal heat exchanger that is disposed inside the target chamber and evaporates the supplied refrigerant to cool the internal atmosphere of the chamber, and sucks and compresses the refrigerant evaporated in the internal heat exchanger A main circuit configured by sequentially connecting a compressor to the compressor and an external heat exchanger for introducing and condensing the refrigerant compressed by the compressor through a refrigerant pipe;
The refrigerant compressed by the compressor is branched and introduced, and the introduced refrigerant is supplied to the internal heat exchanger disposed in the chamber to be heated, and the internal heat exchanger supplies the refrigerant. A branch introduction path for condensing and heating the internal atmosphere of the chamber;
A refrigerant path that introduces the refrigerant condensed in the internal heat exchanger and supplies the refrigerant to the gas cooler, heat-exchanges the refrigerant with ambient air in the gas cooler, and radiates heat;
A return path that introduces the refrigerant that has dissipated heat in the gas cooler and returns it to the upstream of the internal heat exchanger of the main circuit;
A refrigerant circuit comprising: an expansion mechanism for adiabatically expanding at least one of the refrigerant condensed in the external heat exchanger and the refrigerant radiated by the gas cooler, and sending the adiabatic expanded refrigerant to the internal heat exchanger In the device
A refrigerant circuit device comprising a foreign matter removing member that is disposed in a passage region of the refrigerant supplied to the expansion mechanism and removes foreign matters mixed in the refrigerant.   The refrigerant circuit device according to claim 1, wherein a moisture removing member that removes moisture is disposed in a passage region of the refrigerant that is condensed by the external heat exchanger and sent to the expansion mechanism. The expansion mechanism is
A first capillary tube disposed downstream of the external heat exchanger in the main circuit and adiabatically expanding the refrigerant condensed in the external heat exchanger;
A second capillary tube disposed downstream of the gas cooler in the second refrigerant circuit and adiabatically expanding the refrigerant radiated by the gas cooler;
The refrigerant circuit device according to claim 1 or 2, wherein the foreign matter removing member is disposed between the gas cooler and the second capillary tube.   The refrigerant circuit device according to claim 3, wherein a removal member for removing moisture and removing foreign matter is disposed between the external heat exchanger and the first capillary tube.

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