JP2013221694A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger for preventing deterioration of heat exchange performance by suppressing dust from being adhered across a windward side edge face of a fin member.SOLUTION: An outside heat exchanger 23 includes: a refrigerant passage tube 231 formed into a flat shape where a plurality of refrigerant passages 2311 are arranged side by side and extended in a meandering manner; and a plurality of corrugated fins 234 thermally connected between an upstream horizontal extending site 2312 and a downstream horizontal extending site 2312 adjacent to each other while being extended parallel to each other in the refrigerant passage tube 231 and configured to promote heat exchange between a refrigerant passing through the refrigerant passage tube 231 and air passing through its own surroundings. The corrugated fins 234 adjacent to each other in the vertical direction are disposed such that their protrusion heights to the windward side of air are made different from each other. In particularly, it is desired that the corrugated fins 234 adjacent to each other in the vertical direction are disposed in such a configuration that one is more protruded toward the windward side of air than the another.

Description

  The present invention relates to a heat exchanger, and more particularly to a heat exchanger that constitutes a refrigeration cycle, a heat pump cycle, and the like.

  Conventionally, in vending machines that sell products such as canned beverages and beverages in plastic bottles, components such as refrigeration cycles and heat pump cycles outside the product storage of the main body cabinet that is the main body of the vending machine A condenser (external heat exchanger) is provided.

  In such a condenser, a flat refrigerant passage tube having a plurality of refrigerant flow paths arranged in parallel is extended in a meandering manner, and an inlet header is provided at the inlet side of the refrigerant passage tube, and an outlet of the refrigerant passage tube. An outlet header is connected to the side. A corrugated fin member is thermally connected between the horizontally extending portions of the refrigerant passage tube. More specifically, the fin member 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 tube adjacent to each other (for example, patents). Reference 1).

  In the condenser having such a configuration, heat exchange is performed between the air (outside air) passing around the fin member and the refrigerant passing through the refrigerant passage tube, the refrigerant is condensed, and the air is heated.

JP-A-8-29016

  By the way, in the heat exchanger described above, the projecting heights on the windward side and the leeward side of each fin member, that is, the projecting height from the windward end portion of the refrigerant passage tube and the leeward side end portion of the refrigerant passage tube. Since the projecting heights of the fin members are the same, the windward end surface of the fin member constitutes one plane. Thus, in the heat exchanger in which the windward end surface of the fin member constitutes one plane, the dusty matter in the air moves toward the windward end surface of the fin member as the operation time of the refrigeration cycle, the heat pump cycle, etc. becomes longer. There is a problem that the amount of air passing therethrough is reduced, resulting in a decrease in heat exchange performance.

  In view of the above circumstances, the present invention provides a heat exchanger that can prevent a decrease in heat exchange performance by suppressing dust from adhering across the windward end surface of the fin member. For the purpose.

  In order to achieve the above object, a heat exchanger according to the present invention has a flat shape in which a plurality of refrigerant passages are arranged side by side and a meandering refrigerant passage tube, and the refrigerant passage tube. While extending in parallel to each other, the upstream parallel extending portion and the downstream parallel extending portion that are adjacent to each other are thermally connected to each other and pass through the refrigerant passage tube and the surroundings of the refrigerant. In the heat exchanger having a plurality of fin members that promote heat exchange with the fluid to be fluidized, the fin members adjacent to each other in the vertical direction are provided so that the protruding heights of the fluid toward the windward side are different. It is characterized by being.

  In the heat exchanger described above, the present invention is characterized in that one of the fin members adjacent to each other in the vertical direction is provided so as to protrude toward the windward side of the fluid rather than the other.

  Further, the present invention is the heat exchanger described above, wherein the fin member has at least a part of a portion corresponding to its connection portion on a surface opposite to the parallel extending portion to which the fin member is thermally connected. The other fin members are arranged so as not to be thermally connected.

  Further, the present invention is the above-described heat exchanger, wherein the fin member is formed by being bent in a wave shape, and is itself between the upstream parallel extending portion and the downstream parallel extending portion. The outside of the bent portion is connected.

  According to the present invention, since the fin members adjacent to each other in the vertical direction are provided so that the projecting heights of the fluid toward the windward side are different, the shortest distance between the windward end surfaces of the corrugated fins adjacent to each other in the vertical direction It is possible to prevent the dust in the passing air from adhering to the windward end surfaces of the corrugated fins that are adjacent to each other in the upper and lower directions, thereby reducing the air volume of the passing air. In addition, it is possible to prevent the heat exchange performance 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 a front view schematically showing the external heat exchanger shown in FIG. 4 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 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 in-compartment heat exchanger 21 and a heater H are disposed below the carry-out shooter 8. The internal heat exchanger 21 is disposed on the front side of the rear duct D. The internal heat exchanger 21 is sequentially connected through a compressor 22, an external heat exchanger 23, an expansion mechanism 24 and a refrigerant pipe 25 disposed in the machine room 9 to form a refrigerant circuit (refrigeration cycle) 20. ing.

  The compressor 22 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 external heat exchanger 23 is a heat exchanger according to the present embodiment, and is disposed on the front side of the machine room 9. The external heat exchanger 23, which will be described later, drives the external air blower fan F1 with the refrigerant compressed by the compressor 22 and discharged from the discharge port through the refrigerant pipe 25. In this case, heat is exchanged with air (fluid) passing through the periphery from the front to the rear to condense. The expansion mechanism 24 is for adiabatic expansion by reducing the pressure of the passing refrigerant.

  By circulating the refrigerant in these refrigerant circuits 20, the refrigerant compressed by the compressor 22 is condensed in the external heat exchanger 23, and then adiabatically expanded by the expansion mechanism 24 and passes through the internal heat exchanger 21. . When the refrigerant passes through the internal heat exchanger 21, heat is exchanged with the internal air (internal air) of the product storage 3 in which the internal heat exchanger 21 is disposed, Evaporates and cools the internal air. The evaporated refrigerant is sucked into the compressor 22.

  The cooled internal air moves inside the product storage box 3 by driving the internal blower fan F2, whereby the product stored in the product storage rack 6 of the product storage box 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 F2. The heater H heats the surrounding air when energized. The air heated by the heater H moves inside the product storage box 3 by driving the internal blower fan F2, whereby the product stored in the product storage rack 6 of the product storage box 3 has a desired temperature (for example, 55 ° C.).

  3 and 4 schematically show the external heat exchanger shown in FIG. 2, FIG. 3 is a front view, and FIG. 4 is a cross-sectional view taken along line AA in FIG. The external heat exchanger 23 exemplified here includes a refrigerant passage tube 231, an inlet-side header 232, an outlet-side header 233, and a corrugated fin (fin member) 234.

  The refrigerant passage tube 231 is a flat tube in which a plurality of refrigerant passages 2311 are arranged in parallel, and is formed to meander from side to side. A plurality of (two in the illustrated example) refrigerant passage pipes 231 according to the present embodiment are provided, and each of them is formed by meandering left and right along the direction in which the outside air flows, that is, in a state of being lined up and down. is there.

  The inlet-side header 232 is connected to the inlet-side end portion of the refrigerant passage tube 231 and is provided in a form communicating with each refrigerant passage 2311 of the refrigerant passage tube 231. The inlet header 232 is for sending the refrigerant compressed by the compressor 22 and supplied through the refrigerant pipe 25 to each refrigerant passage 2311.

  The outlet-side header 233 is connected to the outlet-side end portion of the refrigerant passage tube 231 and is provided in a form communicating with each refrigerant passage 2311 of the refrigerant passage tube 231. The outlet header 233 is for sending the refrigerant that has passed through each refrigerant passage 2311, that is, the refrigerant condensed through heat exchange, to the refrigerant pipe 25 connected to the expansion mechanism 24.

  The corrugated fins 234 are formed to be bent in a wave shape, and the bent portion outside 2341 is joined and disposed between the horizontally extending portions 2312 in the refrigerant passage tube 231 by brazing or the like. That is, the corrugated fins 234 are formed to be bent in a wave shape, and extend in parallel with each other in the refrigerant passage tube 231 while being adjacent to the upstream horizontal extension part (parallel extension part) 2312 and the downstream horizontal extension. A bent portion outside 2341 is thermally connected between the existing portion (parallel extending portion) 2312 and disposed. More specifically, the corrugated fin 234 has its fin crest 234a thermally connected to the upstream horizontal extension portion 2312 and its fin valley 234b thermally connected to the downstream horizontal extension portion 2312. It is connected to and arranged. Here, the corrugated fins 234 applied to the internal heat exchanger 21 have the same pitches of the fin crests 234a and the fin troughs 234b.

  In such an external heat exchanger 23, the fin trough 234 b of one corrugated fin 234 connected to the upper surface of one horizontal extending portion 2312 in the refrigerant passage pipe 231, and the lower surface of the horizontal extending portion 2312. The fin peak portions 234a of the other corrugated fins 234 to be connected are shifted from each other to the left and right. In other words, the corrugated fins 234 are arranged so that other corrugated fins 234 are not thermally connected to the portions corresponding to their connection locations on the opposite surface of the horizontally extending portion 2312 to which they are thermally connected. It is.

  In the external heat exchanger 23, the fin trough portion 234 b of one corrugated fin 234 connected to the upper surface of one horizontal extending portion 2312 in the refrigerant passage pipe 231 and the lower surface of the horizontal extending portion 2312 are connected. The heat fluxes on the upper inner wall surface of the refrigerant passage 2311 and the heat flux on the lower inner wall surface of the one horizontal extending portion 2312 are arranged by shifting the fin crest portions 234a of the other corrugated fins 234 from side to side. Therefore, the phenomenon of so-called dry-out in which the liquid refrigerant on the inner wall surface of the refrigerant passage 2311 disappears locally can be suppressed. Therefore, it can suppress that a heat flux concentrates on a specific position, and can prevent the heat exchange efficiency fall.

  Further, in the external heat exchanger 23, the corrugated fins 234 that are vertically adjacent to each other have a protruding height toward the windward side of the passing air, that is, forward from the front end 231a of the refrigerant passage pipe 231 on the front side. It is provided so that the projecting heights toward each other are different. More specifically, the corrugated fins 234 that are vertically adjacent to each other are alternately provided in such a manner that one protrudes toward the windward side (front side) of the passing air rather than the other.

  As described above, according to the heat exchanger (external heat exchanger 23) according to the present embodiment, the corrugated fins 234 adjacent to each other in the vertical direction are directed toward the windward side (front side) of the passing air, rather than the other. Accordingly, the shortest distance L between the front end surfaces of the corrugated fins 234 adjacent to each other up and down, and the windward end surfaces of the fin members adjacent to each other up and down constitute one plane. It can be made sufficiently larger than the conventional example.

  As described above, the shortest distance L between the front end surfaces of the corrugated fins 234 that are adjacent to each other in the vertical direction can be made sufficiently large. ) Can be suppressed, and a decrease in the heat exchange performance can be prevented without causing a decrease in the air volume of the passing air.

  Moreover, according to the said external heat exchanger 23, since arrangement | positioning of the corrugated fin 234 is only changed, it is not necessary to change the material of the refrigerant | coolant channel | path pipe | tube 231 and the corrugated fin 234, and thereby heat transfer performance fall and corrosion resistance There is no fear of incurring a decline. In particular, since only the arrangement of the corrugated fins 234 is changed, there is no need to provide a dust removing mechanism or the like, and an increase in the size and cost of the heat exchanger itself can be prevented.

  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 corrugated fins 234 adjacent to each other in the vertical direction are alternately provided in such a manner that one protrudes toward the windward side (front side) of the passing air rather than the other. The fin members (corrugated fins) vertically adjacent to each other need only be provided so that the protruding heights toward the windward side of the passing air are different. As a result, the shortest distance between the windward end surfaces of the fin members adjacent to each other in the vertical direction can be sufficiently increased, so that dust in the passing air adheres across the windward end surfaces of the fin members adjacent to each other in the vertical direction. And the deterioration of heat exchange performance can be prevented without causing a decrease in the air volume of the passing air.

  In the embodiment described above, the corrugated fins 234 to be applied have the same pitches of the fin crests 234a and the fin valleys 234b. However, in the present invention, the fin members are the respective fins. The pitches of the peaks and the fin valleys do not necessarily have to match. In other words, even when a plurality of fin members having different pitches are used, the fin member has at least a part of the part corresponding to its own connection portion on the surface opposite to the parallel extending portion to which it is thermally connected. What is necessary is just to arrange | position so that another fin member may not be thermally connected.

DESCRIPTION OF SYMBOLS 1 Main body cabinet 20 Refrigerant circuit 21 Internal heat exchanger 22 Compressor 23 External heat exchanger 231 Refrigerant passage pipe 2311 Refrigerant passage 2312 Horizontal extension part 232 Inlet side header 233 Outlet side header 234 Corrugated fin (fin member)
234a Fin crest part 234b Fin trough part 2341 Bending part exterior 24 Expansion mechanism 25 Refrigerant piping F1 Outside ventilation fan F2 Inside ventilation fan L Shortest distance

Claims (4)

A refrigerant passage pipe having a flat shape in which a plurality of refrigerant passages are arranged side by side and extending in a meandering manner;
A refrigerant that is thermally connected between the upstream parallel extending portion and the downstream parallel extending portion while extending in parallel with each other in the refrigerant passage tube, and passes through the refrigerant passage tube; A heat exchanger comprising a plurality of fin members that facilitate heat exchange with a fluid passing through the surroundings of the heat exchanger,
The heat exchanger according to claim 1, wherein the fin members adjacent to each other in the vertical direction are provided so as to have different projecting heights toward the windward side of the fluid.   2. The heat exchanger according to claim 1, wherein the fin members adjacent to each other in the vertical direction are provided such that one of the fin members protrudes toward the windward side of the fluid than the other.   The fin member is disposed so that another fin member is not thermally connected to at least a part of a portion corresponding to the connection portion on the surface on the opposite side of the parallel extending portion to which the fin member is thermally connected. The heat exchanger according to claim 1 or 2, wherein the heat exchanger is characterized.   The fin member is formed by being bent into a wave shape, and the outside of its bent portion is connected between the upstream parallel extending portion and the downstream parallel extending portion. The heat exchanger according to any one of claims 1 to 3.

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