JP2012247173A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of preventing decline in heat exchange capacity by preventing occurrence of bimetallic corrosion in a heat exchange part.SOLUTION: The heat exchanger 24 (evaporator 24) includes the heat exchange part 24a. The heat exchange part 24a includes: a refrigerant passage pipe 241 constituting a flow passage 2411 of a refrigerant and extending in a meandering manner; and a corrugated fin 244 configured by the same metallic material as that of the refrigerant passage pipe 241, thermally connected between an upstream side portion and a downstream side portion of the refrigerant passage pipe 241 and exchanging heat between the refrigerant passing through the refrigerant passage pipe 241 and fluid passing around the corrugated fin 244. A lower side sheet 24c interposed between the heat exchange part 24a and an interior floor face 30 and composed of an insulating material is provided in the evaporator 24 installed on the interior floor face 30.

Description

  The present invention relates to a heat exchanger, and more particularly to a heat exchanger that constitutes, for example, a refrigeration cycle or a heat pump cycle.

  Conventionally, in a vending machine that sells products such as canned beverages and plastic bottled beverages, a freezer is placed on the installation site such as the floor surface in the product storage of the main body cabinet that is the main body of the vending machine. An evaporator (heat exchanger) which is a component device such as a cycle is mounted.

  Such an evaporator has a heat exchange part provided with a refrigerant passage pipe and a corrugated fin. The refrigerant passage pipe has a flat shape in which a plurality of refrigerant flow paths are juxtaposed, and is extended in a meandering manner. An inlet header is connected to the inlet side of the refrigerant passage tube, and an outlet header is connected to the outlet side of the refrigerant passage. The corrugated fin is made of the same metal material (for example, aluminum) as the refrigerant passage tube, and is thermally connected between the horizontally extending portions of the refrigerant passage tube. More specifically, the corrugated fin is formed to be bent in a wave shape, and the bent portion outside is joined between the horizontally extending portions of the refrigerant passage pipe (see, for example, Patent Document 1). ).

JP-A-8-29016

  By the way, in the evaporator mentioned above, frost may adhere to the surface of a heat exchange part by cooling the internal air of goods storage. For this reason, when the defrost operation which removes this frost is performed, the water melt | dissolved from the frost may dripped and water may accumulate on the boundary with the lower part of an evaporator, ie, the store | warehouse | chamber interior floor surface. Here, the interior floor of the product storage is generally made of a metal material different from that of the heat exchange section, and local batteries are thereby formed between the heat exchange section and the interior floor. It may be formed, and different metal contact corrosion may occur in the heat exchange part.

  If dissimilar metal contact corrosion occurs in the heat exchanging part in this way, the air path resistance in the corroded part decreases, leading to a reduction in the air volume in the other heat exchanging part. There has been a problem that the heat exchange capacity is lowered due to a drop in performance.

  In view of the above circumstances, an object of the present invention is to provide a heat exchanger capable of preventing the occurrence of contact corrosion of dissimilar metals in a heat exchange part and preventing the heat exchange capability from being reduced. And

  In order to achieve the above object, a heat exchanger according to claim 1 of the present invention comprises a refrigerant passage tube that forms a refrigerant flow path and extends in a meandering manner, and the same metal as the refrigerant passage tube. It is composed of a material, and is thermally connected between the upstream portion and the downstream portion of the refrigerant passage pipe, and heats the refrigerant passing through the refrigerant passage pipe and the fluid passing around the refrigerant passage pipe. A heat exchanger having a heat exchanging part provided with a fin member to be exchanged and installed at a predetermined installation site, and interposed between the heat exchange unit and the installation site and made of an insulating material A sheet body is provided.

  The heat exchanger according to claim 2 of the present invention is the heat exchanger according to claim 1 described above, wherein the sheet body has a hole for allowing water generated on the surface of the heat exchange part to pass therethrough. To do.

  The heat exchanger according to claim 3 of the present invention is characterized in that, in claim 2 described above, the hole has a shape in which an opening area gradually decreases as the hole is separated from the heat exchanger. To do.

  According to the present invention, since the sheet body made of an insulating material is interposed between the heat exchange part and the installation part, water generated on the surface of the heat exchange part is dripped and collected between the installation parts. However, there is no fear that a local battery is formed between the heat exchange part and the installation site. Thereby, a different metal contact corrosion does not arise in a heat exchange part, and the fall of heat transfer performance can be prevented. Therefore, there is an effect that it is possible to prevent different metal contact corrosion from occurring in the heat exchanging portion and to prevent the heat exchanging ability from being lowered.

FIG. 1 is a cross-sectional view showing a case where an internal structure of a vending machine to which a heat exchanger according to an embodiment of the present invention is applied is viewed from the front. 2 is a cross-sectional side view showing the internal structure of the vending machine shown in FIG. FIG. 3 is an enlarged side view schematically showing the evaporator shown in FIG. 2, and a part thereof is shown in cross section. FIG. 4 is an enlarged front view schematically showing the evaporator shown in FIG. 2, and a part thereof is shown in cross section. FIG. 5 is a longitudinal sectional view of the refrigerant passage pipe shown in FIGS. 3 and 4. FIG. 6 is a plan view showing a case where the lower sheet shown in FIGS. 3 and 4 is viewed from above, and a part thereof is shown in cross section. 7 is a cross-sectional view taken along line AA in FIG.

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

  FIG. 1 is a cross-sectional view showing a case where an internal structure of a vending machine to which a heat exchanger 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 them at a desired temperature, and has a heat insulating structure.

  2 is a cross-sectional side view showing the internal structure of the vending machine shown in FIG. 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.

  An evaporator 24 and a heater H are disposed below the carry-out shooter 8. The evaporator 24 is a heat exchanger according to the present embodiment, and the details thereof will be described later, but the evaporator 24 is installed on the interior floor surface on the front side of the rear duct D. The evaporator 24 is sequentially connected through a compressor 21, a condenser 22, an expansion mechanism 23 and a refrigerant pipe 25 disposed in the machine room 9 to form a refrigerant circuit (refrigeration cycle) 20.

  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. The condenser 22 condenses the refrigerant that passes therethrough. More specifically, the refrigerant compressed by the compressor 21 and discharged from the discharge port and sent out through the refrigerant pipe 25 is condensed by exchanging heat with ambient air. The expansion mechanism 23 is constituted by, for example, a capillary tube or an expansion valve, and adiabatically expands by reducing the pressure of the passing refrigerant.

  By circulating the refrigerant in the refrigerant circuit 20, the refrigerant compressed by the compressor 21 is condensed by the condenser 22, and then adiabatically expanded by the expansion mechanism 23 and passes through the evaporator 24. When the refrigerant passes through the evaporator 24, heat exchange is performed with the internal air (internal air) of the commodity storage 3 in which the evaporator 24 is disposed, and the self-evaporates to internal air. Cool down. The evaporated refrigerant is sucked into the compressor 21.

  The cooled internal air moves inside the product storage 3 by driving the internal blower fan F1, so that the product stored in the product storage rack 6 of the product storage 3 has a desired temperature (for example, 5 ° C.). It will be cooled down.

  The heater H is arrange | positioned in the front area of the internal ventilation fan F1. The heater H heats the surrounding air when energized. The air heated by the heater H moves inside the product storage case 3 by driving the internal blower fan F1, so that the product stored in the product storage rack 6 of the product storage case 3 has a desired temperature (for example, 55 ° C.).

  3 and 4 schematically show the evaporator 24 shown in FIG. 2 in an enlarged manner, FIG. 3 is a side view, and FIG. 4 is a front view. The evaporator 24 illustrated here is provided such that the upper region and both side regions of the evaporator 24 are surrounded by the wind tunnel member 40 and covers the drain groove 31 formed in the interior floor surface 30 of the commodity storage 3. It is installed on the floor 30 in the cabinet on the front side of the rear duct D. That is, the part including the drain groove 31 in the interior floor surface 30 of the commodity storage 3 is an installation site of the evaporator 24. The drain groove 31 is a recessed portion communicating with the drain hole 32, and guides water generated on the surface of the evaporator 24 to the drain hole 32.

  The wind tunnel member 40 is made of the same metal material as that of the floor forming the commodity storage 3 and is formed by bending a plate-like body such as a zinc steel plate. The wind tunnel member 40 has a box shape with an open front surface and a rear surface, and forms an air passage for air that has passed through the rear duct D with the evaporator 24. A rectangular opening 41 is formed on the lower surface of the wind tunnel member 40 so as to face the drain groove 31.

  The evaporator 24 includes a heat exchanging portion 24a, an upper sheet 24b, and a lower sheet (sheet body) 24c made of a metal material such as aluminum, which are different from the interior floor surface 30 and the wind tunnel member 40 of the commodity storage 3. Have.

  The heat exchanging portion 24 a includes a refrigerant passage pipe 241, an inlet side header 242, an outlet side header 243, and a corrugated fin (fin member) 244.

  As shown in FIG. 5, the refrigerant passage pipe 241 is a flat pipe in which a plurality of refrigerant flow paths 2411 are arranged in parallel, and is formed to meander from side to side. A plurality of (two in the illustrated example) refrigerant passage pipes 241 according to the present embodiment are provided, each of which is formed to meander from side to side in a manner of being arranged along the direction in which the internal air flows.

  The inlet-side header 242 is connected to the inlet-side end of the refrigerant passage tube 241 and is provided so as to communicate with each flow path 2411 of the refrigerant passage tube 241. The inlet-side header 242 is for adiabatically expanding by the expansion mechanism 23 and sending the refrigerant supplied through the refrigerant pipe 25 to each flow path 2411.

  The outlet-side header 243 is connected to the outlet-side end portion of the refrigerant passage tube 241 and is provided in a form communicating with each flow path 2411 of the refrigerant passage tube 241. The outlet header 243 is for sending the refrigerant that has passed through each flow path 2411, that is, the refrigerant that has evaporated through heat exchange, to the refrigerant pipe 25 connected to the compressor 21.

  The corrugated fins 244 are formed to be bent in a wave shape, and the outside of the bent portion is joined and disposed between the horizontally extending portions 2412 in the refrigerant passage tube 241 by brazing or the like. That is, the corrugated fin 244 is formed to be bent in a wave shape, and the bent portion outside is thermally connected between the upstream portion and the downstream portion of the refrigerant passage pipe 241. The corrugated fins 244 are arranged in such a manner as to straddle the horizontally extending portions 2412 of the refrigerant passage tubes 241 adjacent to each other. Although not explicitly shown in the drawing, a strip-shaped louver may be cut and raised on the surface of the corrugated fin 244.

  The upper sheet 24b is in the form of a film made of, for example, a resin insulating material such as polyester, and has a size sufficient to cover the upper part of the heat exchange part 24a of the evaporator 24. The upper sheet 24b is interposed between the heat exchanging portion 24a and the upper surface 42 of the wind tunnel member 40 by sticking to the inner wall surface of the upper surface 42 of the wind tunnel member 40 with an adhesive or the like. The upper sheet 24b satisfies that it does not deform in a predetermined temperature range (for example, −20 ° C. to 80 ° C.) and has flame retardancy.

  Similar to the upper sheet 24b, the lower sheet 24c is a film-like material made of a resin insulating material such as polyester, and is large enough to cover the lower part of the heat exchange section 24a of the evaporator 24. have. The lower sheet 24c is adhered to the inner wall surface of the edge 43 of the opening 41 on the lower surface of the wind tunnel member 40 (the inner wall surface of the folded portion 43) with an adhesive or the like, so that the heat exchange unit 24a and the commodity storage 3 It is interposed between the inner floor surface 30 (installation site). Like the upper sheet 24b, the lower sheet 24c satisfies that it does not deform in a predetermined temperature range (for example, −20 ° C. to 80 ° C.) and has flame retardancy.

  Further, as shown in FIG. 6, the lower sheet 24 c has a plurality of holes 24 c 1 formed in a region facing the drain groove 31. These holes 24c1 are for allowing water generated on the surface of the heat exchanging portion 24a such as frost melting water adhering to the heat exchanging portion 24a or condensed water on the surface of the heat exchanging portion 24a to pass therethrough. As shown in FIG. 7, the hole 24c1 has a shape in which the opening area gradually decreases from the upper surface to the lower surface, that is, a shape in which the opening area gradually decreases as the distance from the heat exchange portion 24a increases. Have.

  In the evaporator (heat exchanger according to the present embodiment) 24 having the above-described configuration, the lower sheet 24c made of an insulating material is provided between the heat exchange unit 24a and the commodity storage 3 that is the installation site. Since it is interposed between the inner floor surface 30 and the water generated on the surface of the heat exchanging portion 24a is dripped and collected between the inner floor surface 30 and the heat exchanging portion 24a and the inner floor. There is no fear that a local battery is formed between the surface 30 and the surface 30.

  Thus, according to the evaporator 24 which is embodiment of this application, since there is no possibility that a local battery may be formed between the heat exchange part 24a and the floor surface 30 in a store | warehouse | chamber, it is different in the heat exchange part 24a. Metal contact corrosion does not occur, and deterioration in heat transfer performance can be prevented. Therefore, it is possible to prevent the different metal contact corrosion from occurring in the heat exchanging portion 24a and to prevent the heat exchanging ability from being lowered.

  In this way, since different metal contact corrosion does not occur in the heat exchanging portion 24a, it is possible to prevent the occurrence of refrigerant leakage or the like in the heat exchanging portion 24a, and to maintain desired heat exchanging performance. it can.

  In addition, since a plurality of holes 24c1 are formed in the lower sheet 24c, the water generated on the surface of the heat exchanging part 24a can be guided to the drain groove 31, and this water can be supplied to the commodity storage container. 3 can be discharged to the outside. In particular, since the opening 24c1 has a shape in which the opening area gradually decreases as the distance from the heat exchanging part 24a increases, water generated on the surface of the heat exchanging part 24a can be easily collected in the hole 24c1. Therefore, the discharge into the drain groove 31 can be promptly performed.

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

  In the above-described embodiment, the upper sheet 24b and the lower sheet 24c are exemplified by those formed from a resin. However, in the present invention, if formed from an insulating material, it is formed from something other than a resin. It may be the one that was made.

  In the above-described embodiment, the corrugated fin 244 has been described as a fin member. However, in the present invention, the fin member is thermally connected between the upstream portion and the downstream portion in the refrigerant passage tube 241. If the heat exchange between the refrigerant passing through the refrigerant passage tube 241 and the fluid passing through the refrigerant passage pipe 241 can be promoted, the shape is not particularly limited.

  In the above-described embodiment, the hole 24c1 formed in the lower sheet 24c has a shape in which the opening area gradually decreases as the distance from the heat exchange unit 24a increases. The shape is not limited to this, and any shape may be used as long as water generated on the surface of the heat exchange section can pass therethrough. Further, it is not necessary to provide a plurality of holes, and a single hole may be provided.

  As described above, the heat exchanger according to the present invention is useful for a refrigerant circuit that constitutes a refrigeration cycle, a heat pump cycle, or the like used for cooling a product in a vending machine or the like.

DESCRIPTION OF SYMBOLS 1 Main body cabinet 3 Commodity container 20 Refrigerant circuit 21 Compressor 22 Condenser 23 Expansion mechanism 24 Evaporator 24a Heat exchange part 24b Upper sheet 24c Lower sheet (sheet body)
24c1 Hole 241 Refrigerant passage pipe 2411 Flow path 2412 Horizontal extension part 242 Inlet side header 243 Outlet side header 244 Corrugated fin (fin member)
25 Refrigerant piping 30 Floor surface in the chamber 31 Drain groove 32 Drain hole 40 Wind tunnel member 41 Opening

Claims (3)

A refrigerant passage pipe constituting a refrigerant flow path and extending in a meandering manner;
The refrigerant passage tube is made of the same metal material, is thermally connected between the upstream portion and the downstream portion of the refrigerant passage tube, and the refrigerant passing through the refrigerant passage tube and its own In a heat exchanger having a heat exchanging part provided with a fin member for exchanging heat with a fluid passing through the surroundings and installed at a predetermined installation site,
A heat exchanger comprising a sheet body interposed between the heat exchange section and the installation site and made of an insulating material.   The heat exchanger according to claim 1, wherein the sheet body has a hole for allowing water generated on a surface of the heat exchange section to pass therethrough.   The heat exchanger according to claim 2, wherein the hole portion has a shape in which an opening area gradually decreases as the hole portion is separated from the heat exchange portion.

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