JP2012241941A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger achieving a reduction in production costs by reducing the number of manufacturing steps.SOLUTION: This heat exchanger includes: each low pressure refrigerant passage pipe 241 formed by juxtaposing a plurality of low pressure refrigerant passages 2411, exchanging heat between surrounding air and a low pressure refrigerant led to flow into through a low pressure refrigerant inlet header 242 and passed through the low pressure refrigerant passages 2411, and allowing the low pressure refrigerant passed through the low pressure refrigerant passages 2411 to flow out of a low pressure refrigerant outlet header 243; and each high pressure refrigerant passage pipe 244 formed by juxtaposing a plurality of high pressure refrigerant passages 2441, located adjacently to each low pressure refrigerant passage pipe 241, exchanging heat between the surrounding air and a high pressure refrigerant led to flow into through a high pressure refrigerant inlet header 245 and passed through the high pressure refrigerant passages 2441, and allowing the high pressure refrigerant passed through the high pressure refrigerant passages 2441 to flow out of a high pressure refrigerant outlet header 246. The height levels of the low pressure refrigerant passage pipes 241 and high pressure refrigerant passage pipes 244 are displaced from each other.

Description

  The present invention relates to a heat exchanger, and more particularly to a heat exchanger applied to a refrigerant circuit device used to adjust a product to a desired temperature in, for example, a vending machine.

  2. Description of the Related Art Conventionally, for example, a refrigerant circuit device that is applied to a vending machine or the like is provided with a refrigerant circuit. 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. The evaporator cools its surrounding air (internal air of the product storage) by allowing the supplied refrigerant to evaporate through a predetermined flow path. The compressor is disposed in a machine room inside the vending machine main body and outside the commodity storage, and sucks and compresses the refrigerant evaporated by the evaporator. The condenser is arranged in the machine room like the compressor, and introduces and condenses the high-temperature and high-pressure refrigerant compressed by the compressor. An expansion mechanism decompresses the refrigerant | coolant condensed with the condenser, and carries out adiabatic expansion.

  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 internal heat exchanger introduces a refrigerant (high-pressure refrigerant) compressed by a compressor through a branch pipe, and the introduced refrigerant condenses so that its surrounding air (inside the commodity storage container in which it is disposed). Air).

  In such a refrigerant circuit device, when performing the cooling operation, the refrigerant flows only in the cooling path, and when performing the cooling heating operation, the refrigerant flows through the heating path and a part of the cooling path. (For example, refer to Patent Document 1).

  By the way, in the refrigerant circuit device as proposed in Patent Document 1 described above, an internal heat exchanger that constitutes a heating path, and an evaporator disposed in the same commodity storage as the internal heat exchanger. Is generally used as a heat exchanger.

  Such a heat exchanger, which is not explicitly described in Patent Document 1 above, includes a low-pressure refrigerant passage pipe 641 and a high-pressure refrigerant passage pipe 644 as shown in FIGS. 8 and 9.

  The low-pressure refrigerant passage pipe 641 has a flat shape in which a plurality of low-pressure refrigerant passages 6411 are arranged side by side, and is provided in a manner extending in a meandering manner. One end of the low-pressure refrigerant passage pipe 641 is connected to a low-pressure refrigerant inlet header 642 that communicates with the low-pressure refrigerant passage 6411. The low-pressure refrigerant inlet header 642 is connected to a refrigerant pipe connected to the outlet side of the expansion mechanism. The low-pressure refrigerant adiabatically expanded by the expansion mechanism flows into the low-pressure refrigerant passage 6411. In addition, a low-pressure refrigerant outlet header 643 communicating with the low-pressure refrigerant passage 6411 is connected to the other end portion of the low-pressure refrigerant passage pipe 641, and the low-pressure refrigerant outlet header 643 is connected to the inlet side of the compressor. The refrigerant that is connected to the refrigerant pipe and passes through the low-pressure refrigerant passage 6411 flows out toward the compressor.

  In the low-pressure refrigerant passage pipe 641, the low-pressure refrigerant passing through the low-pressure refrigerant passage 6411 is heat-exchanged with ambient air (internal air of the product storage) via the fin member 647 that is thermally connected to itself. It is what cools.

  The high-pressure refrigerant passage pipe 644 has a flat shape in which a plurality of high-pressure refrigerant passages 6441 are arranged side by side, and is provided in a manner extending in a meandering manner. The high-pressure refrigerant passage pipe 644 is provided in a manner adjacent to the low-pressure refrigerant passage pipe 641 at the same level as the low-pressure refrigerant passage pipe 641. A high-pressure refrigerant inlet header 645 communicating with the high-pressure refrigerant passage 6441 is connected to one end of the high-pressure refrigerant passage pipe 644. The high-pressure refrigerant inlet header 645 is connected to a branch pipe and compressed by a compressor. The refrigerant flows into the high-pressure refrigerant passage 6441. In addition, a high-pressure refrigerant outlet header 646 that communicates with the high-pressure refrigerant passage 6441 is connected to the other end of the high-pressure refrigerant passage pipe 644, and the high-pressure refrigerant outlet header 646 is connected to the return pipe and is connected to the high-pressure refrigerant passage 6441. The refrigerant that has passed through is discharged toward the cooling path.

  In such a high-pressure refrigerant passage pipe 644, the high-pressure refrigerant passing through the high-pressure refrigerant passage 6441 is heat-exchanged with the ambient air (inside air of the product container) via the fin member 647 thermally connected to the high-pressure refrigerant passage 6441. Is to heat.

  In such a heat exchanger, the low-pressure refrigerant passage pipe 641, the low-pressure refrigerant inlet header 642, and the low-pressure refrigerant outlet header 643 constitute a cooling path evaporator, and the high-pressure refrigerant passage pipe 644, the high-pressure refrigerant inlet header 645, and the high-pressure refrigerant outlet. When the header 646 constitutes an internal heat exchanger for the heating path and is applied as an evaporator, the low-pressure refrigerant is passed through the low-pressure refrigerant passage 6411 to cool the ambient air, while the internal heat exchanger When this is applied, the high-pressure refrigerant is passed through the high-pressure refrigerant passage 6441 to heat the ambient air.

JP 2010-175119 A

  By the way, in the heat exchanger as described above, the low-pressure refrigerant passage pipe 641 and the high-pressure refrigerant passage pipe 644 are provided so as to be adjacent to each other at the same height level, so that the inlet headers 642 and 645 and the outlet header 643 are provided. , 646 will overlap. Therefore, it is necessary to bend one of the low-pressure refrigerant passage pipe 641 and the high-pressure refrigerant passage pipe 644 so that the inlet headers 642 and 645 and the outlet headers 643 and 646 do not overlap each other ( (See FIG. 8). That is, in the heat exchanger described above, it is necessary to bend one of the low-pressure refrigerant passage pipe 641 and the high-pressure refrigerant passage pipe 644, resulting in an increase in manufacturing cost as the number of manufacturing steps increases. .

  An object of this invention is to provide the heat exchanger which can aim at reduction of a manufacturing cost by reducing the number of manufacturing processes in view of the said situation.

  In order to achieve the above object, a heat exchanger according to claim 1 of the present invention is provided with a plurality of low-pressure refrigerant passages arranged side by side and extending in a meandering manner, and connected to one end of the heat exchanger. The low-pressure refrigerant flowing through the low-pressure refrigerant inlet header and passing through the low-pressure refrigerant passage is subjected to heat exchange with ambient air through a fin member thermally connected thereto, and the low-pressure refrigerant having passed through the low-pressure refrigerant passage is A low-pressure refrigerant passage pipe that flows out through a low-pressure refrigerant outlet header connected to the other end of the gas pipe, and a plurality of high-pressure refrigerant passages arranged side by side and extending in a meandering manner in a form adjacent to the low-pressure refrigerant passage pipe. The high-pressure refrigerant that flows through the high-pressure refrigerant passage and flows through the high-pressure refrigerant inlet header connected to one end of itself is heat-exchanged with ambient air through a fin member that is thermally connected to itself, High A high-pressure refrigerant passage pipe that causes the high-pressure refrigerant that has passed through the refrigerant passage to flow out through a high-pressure refrigerant outlet header connected to the other end of the refrigerant passage, and when applied as a cooler, low-pressure refrigerant is supplied to the low-pressure refrigerant passage. While passing through and cooling the ambient air, when applied as a heater, the low-pressure refrigerant passage tube and the high-pressure refrigerant in a heat exchanger that passes the high-pressure refrigerant through the high-pressure refrigerant passage and heats the ambient air It is characterized in that the height level of the passage pipe and the passage pipe is shifted.

  According to a second aspect of the present invention, in the heat exchanger according to the first aspect described above, the low-pressure refrigerant passage tube is disposed so as to be shifted upward from the high-pressure refrigerant passage tube. .

  According to the present invention, the low-pressure refrigerant passage pipe and the high-pressure refrigerant passage pipe are arranged so as to be shifted from each other, so that the low-pressure refrigerant passage pipe and the high-pressure refrigerant passage pipe are not subjected to bending or the like. Also, the low-pressure refrigerant inlet header and the high-pressure refrigerant inlet header do not overlap, and the low-pressure refrigerant outlet header and the high-pressure refrigerant outlet header do not overlap. Thus, since it is not necessary to perform a bending process etc., there exists an effect that the manufacturing cost can be reduced by reducing the number of manufacturing processes.

FIG. 1 is an explanatory diagram showing a case where an internal structure of a vending machine to which a refrigerant circuit device having a heat exchanger according to a first 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 refrigerant circuit device applied to the vending machine shown in FIGS. 1 and 2. FIG. 4 is a schematic diagram illustrating a case where the left-side heat exchanger (the heat exchanger according to the first embodiment) illustrated in FIG. 3 is viewed from the front side. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a schematic diagram showing a case where the heat exchanger according to the second embodiment of the present invention is viewed from the front side. 7 is a cross-sectional view taken along line BB in FIG. FIG. 8 is a schematic diagram showing a conventional heat exchanger as viewed from the front side. FIG. 9 is an enlarged perspective view showing a portion C of FIG.

  Hereinafter, preferred embodiments of a heat exchanger according to the present invention will be described in detail with reference to the accompanying drawings.

<Embodiment 1>
FIG. 1 is an explanatory diagram showing a case where an internal structure of a vending machine to which a refrigerant circuit device having a heat exchanger according to a first 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 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 has a refrigerant circuit 10 in which a refrigerant (for example, carbon dioxide) is sealed, and includes a main path 20, a high-pressure refrigerant introduction pipe 31, a heat radiation pipe 32, and a return pipe 33. It is configured.

  The main path 20 is configured by sequentially connecting a compressor 21, an external heat exchanger 22, an expansion mechanism 23, 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-pressure refrigerant), and discharges it from the discharge port.

  The compressor 21 in the first embodiment is a two-stage compressor that performs a compression operation in two steps. More specifically, the compressor 21 includes a first compressor 211 that performs a first compression operation and a second compressor 212 that performs a second compression operation, and an intermediate (not shown) therebetween. A heat exchanger is provided. The intermediate heat exchanger cools (heatsinks) the refrigerant compressed by the first compression operation by the first compressor 211 and sends it to the second compressor 212. As such a compressor 21, a reciprocating compressor, a rotary compressor, a scroll compressor, or an inverter compressor capable of adjusting the compression capacity thereof can be 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 compressed by the compressor 21 passes through its own flow path, the external heat exchanger 22 performs heat exchange with ambient air to condense the refrigerant. A three-way valve 26 is provided in the refrigerant pipe 25 that connects the external heat exchanger 22 and the compressor 21. The three-way valve 26 will be described later.

  The expansion mechanism 23 is composed of, for example, an expansion valve or a capillary tube. The expansion mechanism 23 decompresses the refrigerant supplied from the refrigerant pipe 25 connected in a manner communicating with its own inlet and adiabatically expands it to form a low-pressure refrigerant. is there.

  A plurality of (3 in the illustrated example) heat exchangers 24 in the cabinet are provided, each of which is an internal low region of each commodity storage 3 and is disposed on the front side of the rear duct D (see FIG. 2). It is. The refrigerant piping 25 connecting the internal heat exchanger 24 and the expansion mechanism 23 is branched into three by a distributor 27 disposed in the middle thereof, and the internal heat exchanger disposed in the right warehouse 3a. 24 (hereinafter also referred to as the right internal heat exchanger 24a), the internal heat exchanger 24 (hereinafter also referred to as the internal internal heat exchanger 24b) disposed in the central warehouse 3b, and the left internal 3c. It is disposed and connected to the inlet side of the internal heat exchanger 24 (hereinafter also referred to as the left internal heat exchanger 24c), which is the heat exchanger of Embodiment 1 of the present invention.

  In the refrigerant pipe 25, low pressure solenoid valves 281, 282, and 283 are provided on the way from the distributor 27 to the right internal heat exchanger 24a, the central internal heat exchanger 24b, and the left internal heat exchanger 24c. Are provided. The low-pressure solenoid valves 281, 282, and 283 are valve bodies that can be opened and closed. When an open command is given from a control means (not shown), the low-pressure solenoid valves 281, 282, and 283 are opened to allow passage of the refrigerant while being given a close command. In such a case, it is closed to restrict the passage of the refrigerant. Further, in the refrigerant pipe 25, a capillary tube for reducing the pressure of the refrigerant passing therethrough may be disposed on the downstream side of the low pressure solenoid valves 281, 282, and 283. The refrigerant pipe 25 connected to the outlet side of each internal heat exchanger 24 is connected to the compressor 21 in such a manner that it merges at the first junction P1 and communicates with the suction port of the compressor 21.

  In such a main path 20, symbols H, F1, F2, and N in FIG. 3 are a heater, an internal fan, an external fan, and an internal heat exchanger, respectively. The heater H is a heating means that is disposed in the middle warehouse 3b and the left warehouse 3c and that heats the internal air of the middle warehouse 3b and the left warehouse 3c when driven and energized. The internal blower fan F <b> 1 is disposed in each commodity storage 3, and circulates the air that has passed around the internal heat exchanger 24 and the like inside the commodity storage 3 by being driven. The outside blower fan F2 is disposed in the vicinity of the outside heat exchanger 22, and drives outside air around the outside heat exchanger 22 by being driven. The internal heat exchanger N exchanges heat between the high-pressure refrigerant that has passed through the external heat exchanger 22 and the low-pressure refrigerant that has passed through the internal heat exchanger 24.

  The high-pressure refrigerant introduction pipe 31 is connected to the three-way valve 26 and is connected to the inlet side of the left-side internal heat exchanger 24c. The high-pressure refrigerant introduction pipe 31 introduces refrigerant (high-pressure refrigerant) compressed by the compressor 21.

  Here, the three-way valve 26 has 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 pipe 31. Valve means that can be switched alternatively between. The switching operation of the three-way valve 26 is performed according to a command given from the control means.

  One end of the heat radiating pipe 32 is connected to the outlet side of the left-side heat exchanger 24 c, and the other end is connected to the inlet side of the heating side heat exchanger 34. The heat radiation pipe 32 is for sending the refrigerant that has passed through the left-side heat exchanger 24 c to the heating side heat exchanger 34. The heating side heat exchanger 34 is disposed in the machine room 9 in a manner adjacent to the external heat exchanger 22. The heating-side heat exchanger 34 is configured to exchange heat between the refrigerant passing through its own flow path and the ambient air to dissipate the refrigerant.

  The return pipe 33 has one end connected to the outlet side of the heating side heat exchanger 34 and the other end connected to the refrigerant pipe 25 constituting the main path 20, that is, the external heat exchanger 22 and the expansion mechanism 23 (internal heat exchange). Connected to the second confluence P2 of the refrigerant pipe 25 to the vessel N). The return pipe 33 is for returning the refrigerant that has passed through the heating side heat exchanger 34 to the main path 20.

  4 and 5 show the left-inside heat exchanger 24c shown in FIG. 3 (the heat exchanger according to the first embodiment), and FIG. 4 is a schematic view showing the case viewed from the front side. 5 is a cross-sectional view taken along line AA in FIG. The left internal heat exchanger 24c illustrated here includes a low-pressure refrigerant passage tube 241, a low-pressure refrigerant inlet header 242, a low-pressure refrigerant outlet header 243, a high-pressure refrigerant passage tube 244, a high-pressure refrigerant inlet header 245, and a high-pressure refrigerant. An outlet header 246 and a corrugated fin (fin member) 247 are provided.

  The low-pressure refrigerant passage tube 241 is a flat tube in which a plurality of low-pressure refrigerant passages 2411 are arranged in parallel, and is formed to meander from side to side.

  The low-pressure refrigerant inlet header 242 is connected to the inlet-side end 2412 of the low-pressure refrigerant passage pipe 241 and is provided in such a manner as to communicate with each low-pressure refrigerant passage 2411 of the low-pressure refrigerant passage pipe 241. The low-pressure refrigerant inlet header 242 is connected with a refrigerant pipe 25 provided with low-pressure solenoid valves 281, 282, and 283. As a result, the low-pressure refrigerant inlet header 242 allows the refrigerant (low-pressure refrigerant) adiabatically expanded by the expansion mechanism 23 to flow into the low-pressure refrigerant passages 2411.

  The low-pressure refrigerant outlet header 243 is connected to the outlet-side end 2413 of the low-pressure refrigerant passage pipe 241 and is provided in such a manner as to communicate with each low-pressure refrigerant passage 2411 of the low-pressure refrigerant passage pipe 241. The low-pressure refrigerant outlet header 243 is connected to a refrigerant pipe 25 that merges at the first merge point P1. Accordingly, the low-pressure refrigerant outlet header 243 causes the refrigerant that has passed through the low-pressure refrigerant passages 2411 to flow out toward the compressor 21.

  The high-pressure refrigerant passage tube 244 is a flat tube in which a plurality of high-pressure refrigerant passages 2441 are arranged in parallel, and is formed to meander from side to side. The high pressure refrigerant passage tube 244 is provided on the rear side of the low pressure refrigerant passage tube 241.

  The high-pressure refrigerant inlet header 245 is connected to the inlet-side end portion 2442 of the high-pressure refrigerant passage tube 244 and is provided in a form communicating with each high-pressure refrigerant passage 2441 of the high-pressure refrigerant passage tube 244. A high-pressure refrigerant introduction pipe 31 is connected to the high-pressure refrigerant inlet header 245. Thereby, the high-pressure refrigerant inlet header 245 allows the refrigerant (high-pressure refrigerant) compressed by the compressor 21 to flow into each high-pressure refrigerant passage 2441.

  The high-pressure refrigerant outlet header 246 is connected to the outlet side end portion 2443 of the high-pressure refrigerant passage tube 244 and is provided in a manner communicating with each high-pressure refrigerant passage 2441 of the high-pressure refrigerant passage tube 244. The high-pressure refrigerant outlet header 246 is connected to the heat radiation pipe 32. As a result, the high-pressure refrigerant outlet header 246 causes the refrigerant that has passed through the high-pressure refrigerant passages 2441 to flow toward the heating-side heat exchanger 34.

  The corrugated fin 247 is formed to be bent in a wave shape, and the bent portion is joined to the low-pressure refrigerant passage tube 241 and the horizontal extending portions 241a and 244a of the high-pressure refrigerant passage tube 244 by brazing or the like. It is set up. The corrugated fin 247 has a rear end (air upstream side end) of the corrugated fin 247 protruding rearward from a rear end (air upstream end) of the high-pressure refrigerant passage tube 244, and the front of the corrugated fin 247. The side end portion (air downstream side end portion) is disposed in such a manner as to protrude forward from the front end portion (air downstream side end portion) of the low-pressure refrigerant passage pipe 241. Further, the corrugated fins 247 are arranged in such a manner as to straddle the horizontally extending portions 241a and 244a of the low-pressure refrigerant passage tube 241 and the high-pressure refrigerant passage tube 244.

  Although not explicitly shown in the drawing, a strip-shaped louver may be cut and raised on the surface of the corrugated fin 247. A large number of such louvers are formed in a region excluding the rear end and the front end of the corrugated fin 247.

  In such a left side heat exchanger 24c, the height levels of the low pressure refrigerant passage tube 241 and the high pressure refrigerant passage tube 244 are set so that the high pressure refrigerant passage tube 244 is positioned above the low pressure refrigerant passage tube 241. They are staggered. More specifically, the uppermost horizontal extending portion 244a of the high-pressure refrigerant passage tube 244 is located above the uppermost horizontal extending portion 241a of the low-pressure refrigerant passage tube 241, and the high-pressure refrigerant passage tube A horizontal extending portion 244a in the second stage from the uppermost position of 244 is located adjacent to the rear side of the uppermost horizontal extending portion 241a of the low-pressure refrigerant passage pipe 241. Further, each horizontal extending portion 244a below the horizontal extending portion 244a in the second stage from the top of the high-pressure refrigerant passage tube 244 is positioned behind each horizontal extending portion 241a of the low-pressure refrigerant passage tube 241. And are adjacent. The lowest horizontal extending part 241a of the low-pressure refrigerant passage tube 241 is located below the lowest horizontal extending part 244a of the high-pressure refrigerant passage tube 244.

  In the left-side internal heat exchanger 24c, the inlet-side ends 2412 and 2442 and the outlet-side ends 2413 and 2443 of the low-pressure refrigerant passage tube 241 and the high-pressure refrigerant passage tube 244 are located on the left side. The header 242, the low-pressure refrigerant outlet header 243, the high-pressure refrigerant inlet header 245, and the high-pressure refrigerant outlet header 246 are each provided on the left side.

  The refrigerant circuit device having such a left-inside heat exchanger 24c can cool or heat 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 control means places the three-way valve 26 in the first delivery state and gives an open command to the low pressure solenoid valves 281, 282, 283.

  Thus, the refrigerant compressed by the compressor 21 passes through the three-way valve 26 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 is adiabatically expanded by the expansion mechanism 23 and passes through the distributor 27 to the right internal heat exchanger 24a, the internal internal heat exchanger 24b, and the left internal heat exchanger 24c. Sent out.

  The refrigerant (low-pressure refrigerant) sent toward the left-side heat exchanger 24 c enters the low-pressure refrigerant inlet header 242 and then flows into the low-pressure refrigerant passages 2411 of the low-pressure refrigerant passage pipe 241. Then, the refrigerant passing through each low pressure refrigerant passage 2411 evaporates by exchanging heat with the ambient air of the left internal heat exchanger 24c (the internal air of the left internal 3c) via the corrugated fins 247, thereby cooling the ambient air. . The cooled air circulates in the interior by driving the internal blower fan F1, whereby the product stored in the left warehouse 3c is cooled by the circulating air. The refrigerant that has evaporated through the low-pressure refrigerant passages 2411 enters the low-pressure refrigerant outlet header 243 and flows out to the refrigerant pipe 25.

  Similarly to the refrigerant sent to the left internal heat exchanger 24c, the refrigerant sent to the right internal heat exchanger 24a and the internal internal heat exchanger 24b is also shown in the figure. The refrigerant passes through the refrigerant flow path and exchanges heat with ambient air (internal air) to evaporate and cool the ambient air. The cooled air circulates in the interior by driving the internal blower fan F1, whereby the products stored in the right warehouse 3a and the central warehouse 3b are cooled by the circulating air. The refrigerant that has evaporated through the refrigerant flow path flows out into the refrigerant pipe 25 from the outlet.

  The refrigerant flowing out from each internal heat exchanger 24 joins at the first joining point P1, and then is sucked into the compressor 21 and compressed by the compressor 21 to repeat the above-described circulation.

  Next, a 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 control means puts the three-way valve 26 in the second delivery state, gives a close command to the low pressure solenoid valve 283, and gives an open command to the low pressure solenoid valves 281 and 282.

  As a result, the refrigerant compressed by the compressor 21 passes through the three-way valve 26 that is in the second delivery state, and is sent to the left internal heat exchanger 24c through the high-pressure refrigerant introduction pipe 31.

  The refrigerant (high-pressure refrigerant) sent toward the left-side heat exchanger 24 c enters the high-pressure refrigerant inlet header 245 and then flows into the high-pressure refrigerant passages 2441 of the high-pressure refrigerant passage pipe 244. The refrigerant passing through each high-pressure refrigerant passage 2441 is condensed by exchanging heat with the ambient air in the left-side heat exchanger 24c (inside air in the left-handed chamber 3c) via the corrugated fins 247, and heats the ambient air. . The heated air circulates in the interior by driving the internal blower fan F1, so that the product accommodated in the left warehouse 3c is heated by the circulating air. The refrigerant that has passed through each high-pressure refrigerant passage 2441 enters the high-pressure refrigerant outlet header 246 and flows out to the heat radiation pipe 32.

  The refrigerant that has flowed out to the heat radiating pipe 32 passes through the heat radiating pipe 32 to reach the heating side heat exchanger 34, and radiates heat to the ambient air (outside air) by the heating side heat exchanger 34. The refrigerant that has radiated heat from the heating side heat exchanger 34 reaches the second junction P2 after passing through the return pipe 33, and enters the main path 20 at the second junction P2. The refrigerant that has entered the main path 20 reaches the expansion mechanism 23 after passing through the internal heat exchanger N and is adiabatically expanded by the expansion mechanism 23.

  The refrigerant (low-pressure refrigerant) adiabatically expanded by the expansion mechanism 23 passes through the low-pressure electromagnetic valves 281 and 282 opened via the distributor 27 toward the right internal heat exchanger 24a and the internal internal heat exchanger 24b. Sent out.

  The refrigerant sent toward the right internal heat exchanger 24a and the internal internal heat exchanger 24b passes through the refrigerant flow path of each internal heat exchanger 24 and exchanges heat with ambient air (internal air). Evaporate and cool the ambient air. The cooled air circulates in the interior by driving the internal blower fan F1, whereby the products stored in the right warehouse 3a and the central warehouse 3b are cooled by the circulating air. The refrigerant that has evaporated through the refrigerant flow path flows out into the refrigerant pipe 25 from the outlet.

  The refrigerant that has flowed out of the right-side heat exchanger 24a and the left-side heat exchanger 24c joins at the first joining point P1, is sucked into the compressor 21, is compressed by the compressor 21, and repeats the above-described circulation.

  As described above, the left-inside heat exchanger 24c is applied as a cooler when the CCC operation is performed, and is applied as a heater when the HCC operation is performed. When applied as a cooler, low-pressure refrigerant is passed through the low-pressure refrigerant passage 2411 to cool the ambient air, while when applied as a heater, high-pressure refrigerant is passed through the high-pressure refrigerant passage 2441. The surrounding air is heated.

  In the heat exchanger (the left-inside heat exchanger 24c) according to the first embodiment as described above, the low-pressure refrigerant passage tube 241 is arranged so that the high-pressure refrigerant passage tube 244 is positioned above the low-pressure refrigerant passage tube 241. Since the height levels of the high-pressure refrigerant passage pipe 244 and the high-pressure refrigerant passage pipe 244 are shifted from each other, the inlet headers 242, 245 and the outlet header can be provided without bending the low-pressure refrigerant passage pipe 241 and the high-pressure refrigerant passage pipe 244. 243 and 246 do not overlap. Thus, since it is not necessary to perform a bending process etc., the number of manufacturing processes can be reduced and the manufacturing cost can be reduced.

  In the heat exchanger (the left-inside heat exchanger 24c), the inlet side end portions 2412 and 2442 and the outlet side end portions 2413 and 2443 of the low-pressure refrigerant passage tube 241 and the high-pressure refrigerant passage tube 244 are positioned on the left side. Since the low-pressure refrigerant inlet header 242, the low-pressure refrigerant outlet header 243, the high-pressure refrigerant inlet header 245, and the high-pressure refrigerant outlet header 246 are concentrated on the left side, the left and right width of the heat exchanger itself must be made sufficiently large. It is possible to prevent the lateral width from becoming excessive.

<Embodiment 2>
6 and 7 show a heat exchanger according to Embodiment 2 of the present invention. FIG. 6 is a schematic view showing the heat exchanger viewed from the front side, and FIG. 7 is a cross-sectional view taken along line BB in FIG. FIG. The heat exchanger which is this Embodiment 2 is demonstrated as what is corresponded to the left-chamber interior heat exchanger 24c in a refrigerant circuit apparatus similarly to Embodiment 1 mentioned above.

  The left internal heat exchanger 44c illustrated here includes a low-pressure refrigerant passage pipe 441, a low-pressure refrigerant inlet header 442, a low-pressure refrigerant outlet header 443, a high-pressure refrigerant passage pipe 444, a high-pressure refrigerant inlet header 445, and a high-pressure refrigerant. An outlet header 446 and a corrugated fin 447 (fin member) are provided.

  The low-pressure refrigerant passage tube 441 is a flat tube in which a plurality of low-pressure refrigerant passages 4411 are arranged in parallel, and is formed to meander from side to side.

  The low-pressure refrigerant inlet header 442 is connected to the inlet-side end portion 4412 of the low-pressure refrigerant passage pipe 441 and is provided so as to communicate with each low-pressure refrigerant passage 4411 of the low-pressure refrigerant passage pipe 441. The low-pressure refrigerant inlet header 442 is connected to a refrigerant pipe 25 provided with low-pressure solenoid valves 281, 282, and 283. Thus, the low-pressure refrigerant inlet header 442 allows the refrigerant (low-pressure refrigerant) adiabatically expanded by the expansion mechanism 23 to flow into the low-pressure refrigerant passages 4411.

  The low-pressure refrigerant outlet header 443 is connected to the outlet-side end portion 4413 of the low-pressure refrigerant passage pipe 441 and is provided in a manner communicating with each low-pressure refrigerant passage 4411 of the low-pressure refrigerant passage pipe 441. The low-pressure refrigerant outlet header 443 is connected to a refrigerant pipe 25 that merges at the first merge point P1. Thereby, the low-pressure refrigerant outlet header 443 causes the refrigerant that has passed through the low-pressure refrigerant passages 4411 to flow out toward the compressor 21.

  The high-pressure refrigerant passage tube 444 is a flat tube in which a plurality of high-pressure refrigerant passages 4441 are arranged in parallel, and is formed to meander from side to side. The high-pressure refrigerant passage tube 444 is provided on the rear side of the low-pressure refrigerant passage tube 441 in a form adjacent to the low-pressure refrigerant passage tube 441.

  The high-pressure refrigerant inlet header 445 is connected to the inlet-side end portion 4442 of the high-pressure refrigerant passage tube 444 and is provided in a form communicating with each high-pressure refrigerant passage 4441 of the high-pressure refrigerant passage tube 444. A high-pressure refrigerant introduction pipe 31 is connected to the high-pressure refrigerant inlet header 445. Thereby, the high-pressure refrigerant inlet header 445 causes the refrigerant (high-pressure refrigerant) compressed by the compressor 21 to flow into each high-pressure refrigerant passage 4441.

  The high-pressure refrigerant outlet header 446 is connected to the outlet side end portion 4443 of the high-pressure refrigerant passage tube 444 and is provided in such a manner as to communicate with each high-pressure refrigerant passage 4441 of the high-pressure refrigerant passage tube 444. The high-pressure refrigerant outlet header 446 is connected to the heat radiation pipe 32. As a result, the high-pressure refrigerant outlet header 446 causes the refrigerant that has passed through the high-pressure refrigerant passages 4441 to flow toward the heating side heat exchanger 34.

  The corrugated fin 447 is formed to be bent in a wave shape, and the bent portion outside is joined and disposed between the low-pressure refrigerant passage pipe 441 and the horizontal extending portions 441a and 444a of the high-pressure refrigerant passage pipe 444 by brazing or the like. It is set up. The corrugated fin 447 has an aspect in which its rear end (air upstream end) protrudes rearward from the rear end (air upstream end) of the high-pressure refrigerant passage pipe 444, and in front of itself. The side end portion (air downstream side end portion) is disposed in such a manner as to protrude forward from the front end portion (air downstream side end portion) of the low-pressure refrigerant passage pipe 441. Further, the corrugated fins 447 are disposed in a manner straddling the horizontally extending portions 441a and 444a of the low-pressure refrigerant passage tube 441 and the high-pressure refrigerant passage tube 444.

  Although not clearly shown in the drawing, a strip-shaped louver may be cut and raised on the surface of the corrugated fin 447. A large number of such louvers are formed in a region excluding the rear end and the front end of the corrugated fin 447.

  In such a left-side internal heat exchanger 44c, the low-pressure refrigerant passage pipe 441 and the high-pressure refrigerant passage pipe 444 have the same height level, and the inlet-side end portions 4412 and 4442 and the outlet-side end portion thereof. 4413 and 4443 are provided so as to be symmetrical. More specifically, the inlet side end 4412 and the outlet side end 4413 of the low pressure refrigerant passage tube 441 are provided on the left side, and the inlet side end 4442 and the outlet side end portion 4443 of the high pressure refrigerant passage tube 444 are on the right side. It is provided.

  In the heat exchanger (the left-side heat exchanger 44c) according to the second embodiment as described above, the low level refrigerant passage tube 441 and the high pressure refrigerant passage tube 444 have the same height level, Since the inlet-side end portions 4412 and 4442 and the outlet-side end portions 4413 and 4443 are provided to be bilaterally symmetric, either one of the low-pressure refrigerant passage tube 441 and the high-pressure refrigerant passage tube 444 is not bent. However, the inlet headers 442 and 445 and the outlet headers 443 and 446 do not overlap. Thus, since it is not necessary to perform a bending process etc., the number of manufacturing processes can be reduced and the manufacturing cost can be reduced.

  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 first embodiment described above, the low-pressure refrigerant passage tube 241 and the high-pressure refrigerant passage tube 244 are arranged with their height levels shifted so that the high-pressure refrigerant passage tube 244 is positioned above the low-pressure refrigerant passage tube 241. However, in the present invention, the low-pressure refrigerant passage tube and the high-pressure refrigerant passage tube may be arranged so as to be shifted from each other so that the low-pressure refrigerant passage tube is positioned above the high-pressure refrigerant passage tube. Good. This also eliminates the need for bending or the like, so that the manufacturing cost can be reduced by reducing the number of manufacturing steps.

  As described above, the heat exchanger according to the present invention is useful for a refrigerant circuit device used for adjusting a product to a desired temperature in, for example, a vending machine.

DESCRIPTION OF SYMBOLS 1 Main body cabinet 3 Commodity storage box 3a Right warehouse 3b Middle warehouse 3c Left warehouse 10 Refrigerant circuit 20 Main path 21 Compressor 22 External heat exchanger 23 Expansion mechanism 24 Internal heat exchanger 24a Right internal heat exchanger 24b Central warehouse Inner heat exchanger 24c Left chamber inner heat exchanger 241 Low pressure refrigerant passage tube 2411 Low pressure refrigerant passage 2412 Inlet side end 2413 Outlet side end 241a Horizontally extending portion 242 Low pressure refrigerant inlet header 243 Low pressure refrigerant outlet header 244 High pressure refrigerant passage tube 2441 High-pressure refrigerant passage 2442 Inlet side end 2443 Outlet side end 244a Horizontally extending portion 247 Corrugated fin 25 Refrigerant pipe 31 High-pressure refrigerant introduction pipe 32 Heat radiation pipe 33 Return pipe

Claims (2)

A plurality of low-pressure refrigerant passages are arranged side by side and provided so as to extend in a meandering manner, and the low-pressure refrigerant passing through the low-pressure refrigerant passage through the low-pressure refrigerant inlet header connected to one end of itself is passed to itself. A low-pressure refrigerant passage tube that exchanges heat with ambient air through a thermally connected fin member, and causes the low-pressure refrigerant that has passed through the low-pressure refrigerant passage to flow out through a low-pressure refrigerant outlet header connected to the other end of the refrigerant;
A plurality of high-pressure refrigerant passages are juxtaposed and extend in a meandering manner in a manner adjacent to the low-pressure refrigerant passage tube, and flow in through the high-pressure refrigerant inlet header connected to one end of the high-pressure refrigerant passage. The high-pressure refrigerant passing through the refrigerant passage is subjected to heat exchange with ambient air through a fin member thermally connected to the high-pressure refrigerant, and the high-pressure refrigerant passing through the high-pressure refrigerant passage is connected to the other end of the high-pressure refrigerant. A high-pressure refrigerant passage pipe that flows out through the header,
When applied as a cooler, low-pressure refrigerant is passed through the low-pressure refrigerant passage to cool the ambient air, whereas when applied as a heater, high-pressure refrigerant is passed through the high-pressure refrigerant passage to In a heat exchanger that heats air,
A heat exchanger characterized in that the low-pressure refrigerant passage pipe and the high-pressure refrigerant passage pipe are arranged so as to be shifted from each other in level.   The heat exchanger according to claim 1, wherein the low-pressure refrigerant passage pipe is disposed so as to be shifted upward from the high-pressure refrigerant passage pipe.

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