JP2012083070A - Drainage structure of corrugated fin-type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage structure of a corrugated fin-type heat exchanger capable of efficiently draining water attached and accumulated on a corrugated fin positioned on a lowermost end of a heat exchanger when it is used as an evaporator, suppressing ventilation resistance and adverse influence on heat exchanging efficiency, and preventing corrosion of the heat exchanger.SOLUTION: In this corrugated fin-type heat exchanger 1 constituted by alternately arranging a plurality of flat heat exchange tubes 3 and a plurality of corrugated fins 4 parallel to each other, between a pair of header pipes 2a, 2b opposed to each other, a drainage member 7 is disposed in a state of being kept into contact with the corrugated fin of the lowermost end of the heat exchange tube, and the drainage member is provided with drainage channels 8 communicated with waveform sections 4a of the corrugated fins to induce water accumulated in each of the waveform sections by capillary action and drain the water downward.

Description

  The present invention relates to a drainage structure for a corrugated fin heat exchanger, and more specifically, a drainage structure for improving drainage of a parallel flow heat exchanger in which corrugated fins and flat heat exchange tubes are alternately arranged. It is about.

  Generally, corrugated fin-type heat exchangers are widely used in which a plurality of flat heat exchange tubes parallel to each other are horizontally arranged between a pair of opposing header pipes and corrugated fins are joined between the heat exchange tubes. in use.

  When this type of corrugated fin type heat exchanger is used as an evaporator, condensed water (condensation water) adheres to the surface, and water stays between corrugated fins at the bottom of the heat exchanger due to the surface tension and gravity of the water. There has been a problem of increasing ventilation resistance and reducing heat exchange efficiency. In addition, if water stays in the lower part of the heat exchanger, the heat exchanger may be corroded.

  As a technique for preventing corrosion of the heat exchanger, there is known a structure in which a drain hole is drilled at a portion of the stay for mounting the main body that is attached along the lower end of the main body of the heat exchanger. (For example, refer to Patent Document 1).

  Further, in the heat exchanger described in Patent Document 1, a drainage hole is formed in a portion opposite to the lower surface of the heat exchanger body of the side plate disposed outside the corrugated fin on the lowermost end side of the heat exchanger body. Yes.

Japanese Utility Model Publication No. 8-625 (Scope of request for registration of utility model, FIGS. 1 and 4)

  However, the technique described in Patent Document 1 aims to discharge water staying between the outermost side plate of the heat exchanger and the stay, and adheres to the corrugated fin located on the side plate. It does not have the effect of discharging the accumulated water.

  This invention was made in view of the above circumstances, efficiently draining and staying water adhering to the corrugated fin located at the lowermost end of the heat exchanger, suppressing adverse effects on the ventilation resistance and heat exchange efficiency, And it aims at providing the drainage structure of the corrugated fin type heat exchanger which can aim at prevention of the corrosion of a heat exchanger.

  To achieve the above object, the corrugated fin heat exchanger drainage structure according to the present invention has a plurality of parallel flat heat exchange tubes and corrugated fins arranged alternately between a pair of opposing header pipes. In the parallel flow type corrugated fin heat exchanger formed by joining, a drainage member that comes into contact with the corrugated fin at the lowermost end of the heat exchange tube is provided, and the corrugated fin is provided on each corrugated portion of the corrugated fin. A drainage groove that communicates and attracts water staying in each corrugated portion by capillary action to drain downward is formed (claim 1).

  By constituting in this way, the water staying attached to each corrugated portion of the corrugated fin at the lowermost end is attracted into the drainage groove by capillary action, and the water attracted into the drainage groove is the potential energy ( It is discharged downward from the drainage ditch by gravity.

  In this invention, the drainage member is formed by a side channel that contacts the lower end of the corrugated fin, and a plurality of rows are provided at intervals on at least one of the windward side or the leeward side with respect to the heat exchanger in the side channel. Thus, the drainage groove can be formed (claim 2).

  Further, in the present invention, the drainage member is formed by a side channel that contacts the lower end of the corrugated fin, and at least one of the drooping pieces on the windward side or the leeward side of the heat exchanger in the side channel is corrugated. The drainage groove may be formed by the hanging piece and the corrugated portion of the corrugated plate (Claim 3).

  In the invention described in claim 1 or 2, it is preferable that the width of the drain groove is formed narrower than the pitch of the corrugated fins (claim 4).

  By comprising in this way, the action of a capillary phenomenon is promoted and the water which retains in the corrugated part of a corrugated fin can be efficiently attracted | sucked in the groove | channel for drainage.

  According to a fifth aspect of the present invention, in the drainage structure of the corrugated fin heat exchanger according to the first aspect, the drainage member is formed by a side channel that contacts the lower end of the corrugated fin, In addition, a drain-like drainage groove provided along the longitudinal direction of the side channel and opening on the corrugated fin side is formed. In this case, the bottom of the bowl-shaped drainage groove may be formed in an inclined shape from one upper end of the side channel to the lower end of the other end (Claim 6), or the bowl-shaped drainage groove. The bottom portion of the side channel may be formed to be inclined from the center upper portion in the longitudinal direction of the side channel toward both ends.

  By constituting in this way, the water staying attached to each corrugated portion of the corrugated fin at the lowermost end is attracted into the drainage groove by capillary action, and the water attracted into the drainage groove is the potential energy ( It is discharged downward from the end of the drainage groove by gravity.

  In the present invention, it is preferable to form a hydrophilic film by subjecting the inner surface of the drainage groove to a hydrophilic treatment (claim 8).

  By comprising in this way, the water which adheres and retains on each corrugated part of a corrugated fin can be attracted | sucked more efficiently in the groove | channel for drainage.

  In addition, in the present invention, it is preferable that the heat exchanger, the corrugated fin and the drainage member are integrally joined by brazing.

  According to the present invention, water adhering to and staying on each corrugated portion of the corrugated fin at the lowermost end can be attracted into the drainage groove and discharged downward, thereby adversely affecting the ventilation resistance and heat exchange efficiency. It is possible to suppress the corrosion of the heat exchanger.

It is the I section expansion front view (b) of (a) and (a) which shows a 1st embodiment of the drainage structure of the corrugated fin type heat exchanger concerning this invention. It is a perspective view which shows a part of 1st Embodiment of the waste_water | drain structure which concerns on this invention in a cross section. It is a perspective view (a) which shows the principal part of the member for drainage in a 1st embodiment, and an expanded sectional view (b) which meets an II-II line of (a). It is a perspective view which shows the principal part of the corrugated fin in this invention. It is explanatory drawing which shows the discharge state of the water stagnated in the corrugated fin in 1st Embodiment. It is the front view (a) which shows 2nd Embodiment of the drainage structure concerning this invention, and the III section enlarged front view (b) of (a). It is a perspective view which shows a part of 2nd Embodiment of the waste_water | drain structure which concerns on this invention in a cross section. It is a front view which shows 3rd Embodiment of the waste_water | drain structure which concerns on this invention. It is a perspective view which shows a part of 3rd Embodiment of the waste_water | drain structure which concerns on this invention in a cross section. It is a perspective view which shows the principal part of the member for drainage in 3rd Embodiment. It is a front view which shows another modification of 3rd Embodiment of the drainage structure which concerns on this invention. It is a front view which shows another modification of 3rd Embodiment of the drainage structure which concerns on this invention.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated in detail based on an accompanying drawing. Here, the case where the corrugated fin type heat exchanger according to the present invention is applied to an evaporator will be described.

<First Embodiment>
As shown in FIG. 1, a corrugated fin heat exchanger 1 according to the present invention includes a pair of header pipes 2a and 2b made of aluminum (including an aluminum alloy) facing each other, and between the header pipes 2a and 2b. A plurality of flat heat exchange tubes 3 laid (connected) in parallel with each other in the horizontal direction and corrugated fins 4 interposed between adjacent heat exchange tubes 3 are brazed. The heat exchange tube 3 is formed with a plurality of divided heat medium passages 3a. An end cap 6 made of aluminum is brazed to the upper and lower opening ends of the header pipes 2a and 2b.

  A plate-like side channel 5 made of aluminum is brazed to the upper outer side of the uppermost corrugated fin 4 of the heat exchanger 1. An aluminum drainage member 7 is brazed to the lower outer side of the lowermost corrugated fin 4 of the heat exchanger 1.

  As shown in FIGS. 2 and 3, the drainage member 7 includes a horizontal piece 7a that contacts the lower end of the corrugated fin 4 at the lowermost end, and a hanging piece 7b that bends orthogonally from one end of the horizontal piece 7a. It is formed by angle-shaped side channels formed of an aluminum extruded profile. A plurality of drain grooves 8 are formed in the hanging piece 7b of the draining member 7 at appropriate intervals along the longitudinal direction of the draining member 7 from the lower end of the hanging piece 7b to the intersection of the horizontal pieces 7a. Has been. In this case, the width p1 of the drain groove 8 is narrower than the pitch P of the corrugated fins 4 (see FIG. 1B).

  Further, a hydrophilic film 9 is formed on the inner surface of the drain groove 8 provided in the drain member 7 by a hydrophilic process such as a fine rough surface process or a hydrophilic coating (FIG. 3B). reference).

  Here, as shown in FIG. 2, the hanging piece 7b provided on the drainage member 7 is located on the leeward side of the air A. However, as shown by a two-dot chain line, the hanging piece 7b is placed on the upwind side of the air A. Alternatively, the side channel may be formed in a U shape, and the hanging piece 7b may be positioned both on the leeward and leeward side of the air A.

  In the heat exchanger 1 configured as described above, the corrugated fins 4 are formed by alternately repeating mountain-valley folding so that the thin plate has a predetermined height. From the viewpoint, it can be viewed as a continuous V-shape. In this case, the corrugated fin 4 has a fin louver 4c formed by cutting and raising a plurality of vertical slits 4b provided parallel to each other in the width direction of the corrugated fin 4 (see FIG. 4).

  Thus, by providing the fin louver 4c in the corrugated fin 4, the heat exchange capacity can be improved, that is, by providing a predetermined number of louvers formed at a predetermined angle in the air passage, The transmission performance can be improved.

  Further, the condensed water (condensation water) condensed on the V-shaped (valley fold) fin surface moves to the adjacent inverted V-shaped (mountain fold) portion via the fin louver 4a because there is no water channel to the lower stage, Drainage is promoted by smoothly repeating the mechanism in which the condensed water collected in the inverted V-shaped portion flows into the corrugated fin 4 on the lower side through the heat exchange tube 3 from the lower opening.

  In order to manufacture the heat exchanger 1 configured as described above, the heat exchange tubes 3 and the corrugated fins 4 are alternately arranged between the header pipes 2a and 2b and assembled. The upper side channel 5 is arranged on the outer side, the horizontal piece 7a of the drainage member 7 is in contact with the lower end surface of the lowermost corrugated fin 4, and a fixing jig (not shown) is used. The above members are assembled. Then, the assembled heat exchanger 1 is inserted into the furnace, heated at a predetermined temperature, and the above-mentioned members are integrally brazed.

  According to the drainage structure of the first embodiment configured as described above, a plurality of drainage grooves formed on the hanging piece 7b of the draining member 7 from the lower end of the hanging piece 7b to the intersection of the horizontal piece 7a. 8, the water W adhering to and staying on the corrugated portion 4a of the corrugated fin 4 at the bottom is attracted into the drainage groove 8 by capillary action, and the water W attracted into the drainage groove 8 is It can be discharged downward from the drain groove 8 by potential energy (gravity).

  Further, by forming the width p1 of the drainage groove 8 to be narrower than the pitch P of the corrugated fins 4, the action of capillary action can be promoted, and the hydrophilic film 9 is formed on the inner surface of the drainage groove 8. Thus, the action of the capillary action can be further promoted, and the water W adhering to and staying on the corrugated portion 4a of the lowermost corrugated fin 4 can be efficiently discharged downward.

<Second Embodiment>
In 1st Embodiment, although the member 7 for drainage was formed in the angle-shaped side channel, and demonstrated the case where the groove | channel 8 for drainage was provided in the hanging piece 7b of the member 7 for drainage, it replaced with this and FIG. As shown in FIG. 7, the drainage member 7 </ b> A including the drainage groove 8 </ b> A may be configured with an angle-shaped side channel 10 and a corrugated plate 11.

  That is, the drainage member 7A in the second embodiment is an angle formed by an aluminum extruded profile in which the horizontal piece 10a is brazed to the lower outer side of the corrugated fin 4 at the lowermost end of the heat exchanger 1A. Side channel 10 and an aluminum corrugated plate 11 that is brazed (suspended) on the surface of the hanging piece 10b of the side channel 10. Further, the drainage groove 8 </ b> A is composed of a hanging piece 10 b of the side channel 10 and a corrugated portion 11 a of the corrugated plate 11. In this case, the width p2 of the drainage groove 8A is narrower than the pitch P of the corrugated fins 4 (see FIG. 6B).

  Also in the second embodiment, a hydrophilic film (see FIG. 5) is formed on the inner surface of the drain groove 8A, that is, the surface of the hanging piece 7b of the side channel 10 and the inner surface of the corrugated portion 11a of the corrugated plate 11. (Not shown) is preferred.

  Here, as shown in FIG. 7, the hanging piece 10b provided on the side channel 10 constituting the draining member 7A is located on the leeward side of the air A. However, as shown by the two-dot chain line, the hanging piece 10b May be positioned on the windward side of the air A, or the side channel 10 may be formed in a U shape and the hanging piece 10b may be positioned on both the windward and leeward side of the air A.

  In the second embodiment, the other parts are the same as those in the first embodiment, so the same parts are denoted by the same reference numerals and description thereof is omitted.

  In order to manufacture the heat exchanger 1 configured as described above, the heat exchange tubes 3 and the corrugated fins 4 are alternately arranged between the header pipes 2a and 2b and assembled. The upper side channel 5 is arranged outside, the horizontal piece 10a of the side channel 10 constituting the drainage member 7A is in contact with the lower end surface of the lowermost corrugated fin 4, and the hanging piece of the side channel 10 is placed. The corrugated plate 11 is brought into contact with 10b, and the above members are assembled using a fixing jig (not shown). Then, the assembled heat exchanger 1 is inserted into the furnace, heated at a predetermined temperature, and the above-mentioned members are integrally brazed.

  According to the drainage structure of the second embodiment configured as described above, the drooping piece 10b of the channel-shaped side channel 10 brazed to the lower outer side of the lowermost corrugated fin 4 of the heat exchanger 1A. By forming the drainage member 7A by brazing the corrugated plate 11 and forming the drainage groove 8A, the water W adhering to and staying on the corrugated portion 4a of the corrugated fin 4 at the bottom is capillarized. Thus, the water W attracted into the drainage groove 8A can be discharged downward from the drainage groove 8A by the potential energy (gravity).

  Further, by forming the width p2 of the drain groove 8A to be narrower than the pitch P of the corrugated fin 4, the action of the capillary phenomenon can be promoted, and a hydrophilic film (not shown) is formed on the inner surface of the drain groove 8A. By forming, the action of the capillary phenomenon can be further promoted, and the water W staying attached to the corrugated portion 4a of the lowermost corrugated fin 4 can be efficiently discharged downward.

<Third Embodiment>
As shown in FIG. 8, the corrugated fin heat exchanger 1B according to the third embodiment forms the drainage member 7B with an aluminum side channel that contacts the lower end of the corrugated fin 4 at the lowermost end. It is formed along the longitudinal direction of the side channel, and is formed with a bowl-shaped drainage groove 8B that opens to the corrugated fin 4 side.

  That is, as shown in FIGS. 8 to 10, the drainage member 7 </ b> B in the third embodiment extends along the longitudinal direction at the center of the plate-like side channel body 12 that is brazed to the lower end of the lowermost corrugated fin 4. A drainage groove 8B having a substantially V-shaped cross section is formed.

  In this case, the drainage member 7B is formed by an aluminum extruded profile, or the aluminum plate member is bent by press working or the like. Further, similarly to the first embodiment, a hydrophilic film (not shown) is formed on the inner surface of the drain groove 8B.

  In the third embodiment, the other parts are the same as those in the first embodiment. Therefore, the same parts are denoted by the same reference numerals and description thereof is omitted.

  In order to manufacture the heat exchanger 1 configured as described above, the heat exchange tubes 3 and the corrugated fins 4 are alternately arranged between the header pipes 2a and 2b and assembled. The upper side channel 5 is arranged on the outer side, the side channel body 12 is arranged in contact with the lower end surface of the lowermost corrugated fin 4, and each of the above members is fixed using a fixing jig (not shown). Assemble. Then, the assembled heat exchanger 1 is inserted into the furnace, heated at a predetermined temperature, and the above-mentioned members are integrally brazed.

  According to the drainage structure of the third embodiment configured as described above, the water staying attached to each corrugated portion 4a of the corrugated fin 4 at the lowermost end is attracted into the drainage groove 8B by capillary action, The water attracted into the drain groove 8B can be discharged downward from the end of the drain groove 8B by potential energy (gravity).

  In the above description, the case where the bottom portion 13 of the drainage groove 8B of the drainage member 7B is horizontally formed has been described. However, the bottom portion 13 is for drainage that is inclined from the upper end of the side channel body 12 toward the lower end of the other end. A drainage member 7C having a groove 8C may be formed (see FIG. 11), or the bottom 13 has a drainage groove 8D that is inclined from the center upper portion in the longitudinal direction of the side channel body 12 toward both ends. A member 7D may be formed (see FIG. 12).

  According to the heat exchangers 1C, 1D including the drainage members 7C, 7D configured as described above, the drainage grooves 8C, 8C, 8D, The water sucked into 8D can be quickly discharged to the outside downward.

<Other embodiments>
In the above embodiment, the case where the drainage structure according to the present invention is applied to an evaporator has been described. However, in the parallel flow type corrugated fin type heat exchanger other than the evaporator, the present invention is a case where a heat exchange tube is horizontally disposed. However, it has sufficient drainage properties of water droplets adhering to the surface and can suppress adverse effects on the ventilation resistance and heat exchange efficiency.

1, 1A, 1B, 1C, 1D Heat exchanger 2a, 2b Header pipe 3 Heat exchange tube 4 Corrugated fin 4a Corrugated part 7 Drainage member (side channel)
7A, 7B, 7C, 7D Drainage member 8A, 8B, 8C, 8D Drainage groove 9 Hydrophilic coating 10 Side channel 11 Corrugated plate 11a Corrugated part 12 Side channel body 13 Bottom P Corrugated fin pitch p1 Drainage groove 8 Width p2 width of drainage groove 8A

Claims (9)

In a parallel flow type corrugated fin heat exchanger formed by alternately arranging a plurality of flat heat exchange tubes and corrugated fins parallel to each other between a pair of opposing header pipes,
A drainage member that is in contact with the corrugated fin at the lowermost end of the heat exchange tube is provided, and the drainage member communicates with each corrugated portion of the corrugated fin, and attracts the water remaining in each corrugated portion by capillary action. A drainage structure for a corrugated fin-type heat exchanger, characterized in that a drainage groove for draining downward is formed. In the drainage structure of the corrugated fin heat exchanger according to claim 1,
The drainage member is formed by a side channel in contact with the lower end of the corrugated fin, and a plurality of rows are provided at intervals on the windward side or the leeward side with respect to the heat exchanger in the side channel. A drainage structure for a corrugated fin heat exchanger, characterized by forming a groove for use. In the drainage structure of the corrugated fin heat exchanger according to claim 1,
The drainage member is formed by a side channel in contact with the lower end of the corrugated fin, and a corrugated plate is suspended from at least one of the drooping pieces on the windward side or the leeward side of the heat exchanger in the side channel. A drainage structure for a corrugated fin heat exchanger, wherein the drainage groove is formed by the corrugated portion of the drooping piece and the corrugated plate. In the drainage structure of the corrugated fin-type heat exchanger according to claim 2 or 3,
A drainage structure for a corrugated fin heat exchanger, wherein a width of the drainage groove is formed to be narrower than a pitch of the corrugated fins. In the drainage structure of the corrugated fin heat exchanger according to claim 1,
The drainage member is formed by a side channel that contacts the lower end of the corrugated fin, and is provided in the side channel along the longitudinal direction of the side channel and has a bowl-shaped drainage groove that opens to the corrugated fin side. A drainage structure for a corrugated fin heat exchanger, characterized by comprising: In the corrugated fin heat exchanger drainage structure according to claim 5,
A drainage structure for a corrugated fin heat exchanger, wherein the bottom of the bowl-shaped drainage groove is formed in an inclined shape from one upper end to the other lower end of the side channel. In the corrugated fin heat exchanger drainage structure according to claim 5,
A drainage structure for a corrugated fin heat exchanger, characterized in that the bottom of the bowl-shaped drainage groove is formed to be inclined from the upper center in the longitudinal direction of the side channel toward both ends. In the drainage structure of the corrugated fin heat exchanger according to any one of claims 1 to 7,
A drainage structure for a corrugated fin heat exchanger, wherein the drainage groove is subjected to a hydrophilic treatment to form a hydrophilic film. In the drainage structure of the corrugated fin heat exchanger according to any one of claims 1 to 8,
A corrugated fin heat exchanger drainage structure, wherein the heat exchanger, the corrugated fin and the drainage member are integrally joined by brazing.

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