JP2009115342A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of preventing attachment of dust to root portions of flat tubes. <P>SOLUTION: In this heat exchanger comprising the plurality of flat tubes 12, and a pair of header tanks 15, 16 vertically disposed, having a plurality of tube holes 152a to which end portions of the plurality of flat tubes 12 are joined, and communicated with inner portions of the flat tubes 12, the lower header tank 16 includes a flat plate-shaped core plate 152 on which the plurality of tube holes 152a are formed, and a tank plate 153 having a roughly U-shaped central portion 153a and roughly L-shaped both side portions 153b, both side portions 153b of the tank plate 153 are caulked and fixed by being caulked while involving both sides of the core plate 152, and a windbreak wall 153c is formed on an extension of the caulked and fixed part at a windward side. Thus the attachment of dust can be prevented. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a heat exchanger for exchanging heat between fluid flowing inside and air, and relates to an air flow on the air passage side.

  Conventionally, what is shown, for example in patent document 1 as this kind of heat exchanger is known. That is, it is composed of a plurality of flat tubes stacked in the left-right direction, fins disposed between adjacent flat tubes, and a pair of header tanks disposed in the vertical direction.

The header tank is provided with tube holes into which the ends of a plurality of flat tubes are inserted, and both ends of the flat tubes are fixed to the tube holes by brazing. Thereby, the inside of a flat tube and the inside of a header tank communicate.
JP-A-2005-221115

  However, the lower header tank having the configuration as described in Patent Document 1 is arranged at a position where the joint portion between the end portion of the flat tube and the tube hole, that is, the root portion of the flat tube is in a direction in which dust or the like is easily stored. ing. That is, since fins are not disposed on the root portion of the flat tube, dust contained in the blown air may hit the root portion of the flat tube and accumulate.

  Further, if each member constituting the heat exchanger is formed of aluminum or an aluminum alloy, the corrosion rate of the joint portion between the end portion of the flat tube and the tube hole is increased due to the influence of dust accumulation. That is, since the root portion of the flat tube is most easily corroded, there is a problem such as refrigerant leakage.

  Then, the objective of this invention is providing the heat exchanger which can prevent dust adhesion with respect to the root part of a flat tube.

In order to achieve the above object, the following technical means are adopted. That is, in the first aspect of the present invention, a plurality of flat tubes (12) which are stacked in a horizontal direction perpendicular to the air flow direction and through which a fluid flows, and a plurality of flat tubes (12) which are arranged in the vertical direction. A heat exchanger having a plurality of tube holes (152a) to which end portions of the flat tube (12) are connected and a pair of tanks (15, 16) communicating with the inside of the flat tube (12).
In the tank (16) arranged below, a windbreak wall (153c) is integrated with the tank (16) on the windward side of the air flow at the joint between the end of the flat tube (12) and the tube hole (152a). It is characterized by being formed.

  According to the present invention, the blast air is directed toward the joint portion between the end portion of the flat tube (12) and the tube hole (152a), that is, the root portion of the flat tube (12), by the windward windbreak wall (153c). Since it does not directly hit, it is possible to prevent dust from adhering to the root portion of the flat tube (12).

  In the invention according to claim 2, the tank (16) disposed below includes a flat core plate (152) in which a plurality of tube holes (152a) are formed, and a center formed in a substantially U-shaped cross section. Part (153a) and a tank plate (153) having both side parts (153b) formed in a substantially L-shaped cross section, and both side parts (153b) of the tank plate (153) are connected to both sides of the core plate (152). The windbreak wall (153c) is formed on an extension of the caulking-fixed portion and is fixed by caulking so as to be wound. According to this invention, the windbreak wall (153c) can be formed integrally with the tank plate (153). Thereby, manufacturing cost can be held down.

  In invention of Claim 3, the fin (13) is arrange | positioned between adjacent flat tubes (12), and the upper end of the windbreak wall (153c) is the lower end of a fin (13). It is characterized by being formed to close. According to this invention, dust is not blown toward the root portion of the flat tube (12). Therefore, it is possible to prevent dust from adhering to the root portion of the flat tube (12).

  The invention according to claim 4 is characterized in that the fin (13) is disposed so as to protrude further to the windward side than the end of the flat tube (12). According to this invention, the lower end of the fin (13) can be closed with the windbreak wall (153c) without a gap.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
Hereinafter, the heat exchanger in 1st Embodiment is demonstrated based on FIG. 1 thru | or FIG. In the present embodiment, the present invention is applied to a condenser that condenses and liquefies the refrigerant in the refrigeration cycle apparatus as a heat exchanger. In addition to the condenser, the present invention may be applied to an evaporator.

  FIG. 1 is a perspective view showing a schematic configuration of a condenser 10 in the present embodiment. FIG. 2 is a cross-sectional view showing the configuration of the lower header tank 16 in the present embodiment. FIG. 3 is a cross-sectional view showing the configuration of the upper header tank 15 in the present embodiment. FIGS. 4A to 4D are explanatory views showing the processing procedure of the tank plate 153 in the present embodiment.

  The condenser 10 of this embodiment is comprised from the core part 11 and a pair of header tanks 15 and 16, as shown in FIG. Each member constituting these is made of aluminum or an aluminum alloy, assembled by fitting, caulking, fixture fixing, or the like, and integrally brazed by a brazing material provided in advance on a necessary portion of each member surface.

  The core portion 11 includes a plurality of flat tubes 12 and a plurality of fins 13. The flat tube 12 is laminated | stacked on the left-right direction (horizontal direction). That is, they are stacked in the horizontal direction perpendicular to the air flow direction. The flat tube 12 has a flat cross section. A plurality of flow passages (not shown) are provided in the longitudinal direction of the flat tube 12, and are formed by, for example, extrusion. In addition, a refrigerant | coolant is distribute | circulated through a flow path.

  Fins 13 are arranged between adjacent flat tubes 12. That is, the flat tubes 12 and the fins 13 are alternately stacked. The fin 13 is a corrugated fin formed in a wave shape, and the top of the mountain and the bottom of the valley are brazed to each adjacent flat tube 12. In order to increase the heat radiation area on the air side, the fin 13 of the present embodiment is disposed so as to protrude from the end of the flat tube 12 to the windward side of the air flow.

  Further, a side plate 14 as a strength member opening in a U-shaped cross section is disposed further outward of the left and right outermost fins 13. Both ends of the side plate 14 are fixed to a pair of header tanks 15 and 16.

  A pair of header tanks 15 and 16 extending in the stacking direction of the flat tubes 12 are provided at both ends in the longitudinal direction of the plurality of flat tubes 12. The pair of header tanks 15 and 16 are arranged in parallel vertically. End portions of the flat tubes 12 are joined to the upper and lower header tanks 15, 16, and a flow part (not shown) formed inside the header tanks 15, 16 and a flow passage in the flat tubes 12 are provided. Brazed to communicate with each other.

  The upper and lower header tanks 15 and 16 are constituted by tank plates 151 and 153, a core plate 152, an end plate 154, and a partition plate 155, as shown in FIGS. The upper and lower header tanks 15 and 16 of this embodiment are formed so that the shapes of the tank plates 151 and 153 are partially different. More specifically, a windbreak wall 153c is formed on the windward side of the air flow in the header tank 16 disposed below, as shown in FIG.

  A tank plate 153 used for the header tank 16 disposed below is formed by pressing, bending, and crimping a plate-like member. The tank plate 153 after caulking is formed of a central portion 153a formed in a substantially U-shaped cross section and both side portions 153b formed in a substantially U-shaped cross section. Further, a windbreak wall 153 c is formed integrally with the tank plate 153 on the side of the windward side.

  The core plate 152 is formed by pressing a plate-like member and is formed in a flat plate shape. In the core plate 152, a plurality of tube insertion holes 152a are provided in the stacking direction at positions corresponding to the ends of the flat tubes 12. The end of the flat tube 12 is inserted into the tube insertion hole 152a and joined by brazing. As a result, a joint portion between the end portion of the flat tube 12 and the tube insertion hole 152a is formed. In addition, the edge part of the side plate 14 is inserted by the outermost tube insertion hole 152a on either side, and is joined by brazing.

  Further, the inside of the central portion 153 a formed in a substantially U-shaped cross section is formed as a circulation portion in the header tank 16. By making this circulation part substantially U-shaped, the pressure resistance of the circulation part can be increased. Both sides of the core plate 152 are clamped and fixed to both side portions 153b formed in a substantially U-shaped cross section (details will be described later).

  The windbreak wall 153 c is a wall for sealing a gap between the lower end of the fin 13 and the air passage side of the core plate 152. The windbreak wall 153c is formed on the extension of one side part 153b fixed by caulking. The upper end of the windbreak wall 153 c is formed so as to close the lower end of the fin 13.

  By arranging the windbreak wall 153c on the windward side of the joint between the end of the flat tube 12 and the tube insertion hole 152a, the blown air does not directly hit the joint, that is, the root portion of the flat tube 12. ing. Thereby, dust adhesion to the root portion of the flat tube 12 can be prevented.

  As shown in FIG. 3, the tank plate 151 used for the header tank 15 disposed above is formed by pressing and caulking a plate-like member in the same manner as the tank plate 153. The tank plate 151 after caulking is formed of a central portion 151a having a substantially U-shaped cross section and both side portions 151b having a substantially U-shaped cross section.

  That is, the tank plate 151 disposed above has a structure in which the windward windbreak wall 153c is not provided. As a result, the blown air directly hits the joint between the end of the flat tube 12 and the tube insertion hole 152 a, that is, the root portion of the flat tube 12. However, since the root portion of the flat tube 12 in this case is disposed downward, dust does not accumulate in the root portion.

  The end plate 154 is a lid member that covers an end portion of a circulation portion formed by the tank plates 151 and 153 and the core plate 152. It is provided at the end of the upper and lower header tanks 15 and 16 (see FIG. 1). The partition plate 155 is a partition plate for partitioning the flow part formed by the tank plate 151 and the core plate 152 in the left and right directions. The partition plate 155 of the present embodiment is disposed in the upper header tank 15 (see FIG. 1). Thereby, in the upper header tank 15, the circulation part is divided into two places.

  Reference numerals 18 and 19 shown in FIG. 1 are refrigerant inlet / outlet portions and are provided on the end side of the upper header tank 15. Reference numeral 18 denotes an inlet portion, and reference numeral 19 denotes an outlet portion. The refrigerant flows into the inlet 18 and flows out from the outlet 18.

  By disposing the end plate 154, the partition plate 155, the inlet portion 18, and the outlet portion 19 on the tank plates 151, 153 and the core plate 152, a refrigerant passage is formed. That is, the refrigerant flowing from the inlet 18 flows into the left circulation part in the upper header tank 15, flows downward through the flat tube 12, and flows into the circulation part in the lower header tank 16.

  The refrigerant flowing into the flow part in the lower header tank 16 flows in the right direction because there is no partition plate 155. Then, the refrigerant flowing in the right direction flows upward through the flat tube 12 and flows into the right circulation portion in the upper header tank 15. The refrigerant that has flowed into the right circulation part flows out from the outlet part 19.

  Next, a processing procedure for the tank plate 153 disposed below will be described with reference to FIG. FIG. 4A is a side view showing the shape of the tank plate 153 after press working. FIG. 4B is a side view showing the shape of the windbreak wall 153c after bending. FIG. 4C is a side view showing the shape after the core plate 152 and the core portions (flat tubes 12 and fins 13) 11 are arranged on the tank plate 153. FIG. 4D is a side view showing the shape after the tank plate 153 is crimped to the core plate 152.

  First, the tank plate 153 is formed by pressing a plate-like member into a predetermined shape. Specifically, as shown in FIG. 4A, the tank plate 153 has a center portion 153a formed into a substantially U-shaped section by pressing and both side portions 153b formed into a substantially L-shaped section. is doing. At this time, one of the side portions 153b (disposed on the windward side) is formed in advance longer than the other by the length required for the windbreak wall 153c.

  Then, as shown in FIG. 4B, the longer side portions 153b are bent into a substantially L-shaped cross section to form a windbreak wall 153c. Then, as shown in FIG. 4C, the core plate 152 in which the ends of the plurality of flat tubes 12 are inserted into the plurality of tube insertion holes 152 a is disposed on the tank plate 153. At this time, fins 13 are arranged between adjacent flat tubes.

  Then, as shown in FIG. 4 (d), the both side portions 153 b of the tank plate 153 are crimped so as to be wound around both sides of the core plate 152. That is, caulking is performed so that both sides of the core plate 152 are sandwiched between both side portions 153b. By such caulking, both side portions 153b of the tank plate 153 are formed in a substantially U-shaped cross section. At this time, the sealing wall is formed so that the upper end of the windbreak wall 153 c closes the lower end of the fin 13.

  The lower header tank 16 is assembled by the processing procedure of the tank plate 153 as described above. The upper header tank 15 can be assembled by the processing procedure shown in FIGS. 4 (a), 4 (c) and 4 (d). In other words, the processing shown in FIG. 4B is omitted. At this time, the condenser 10 is assembled by arranging and assembling other members.

  And the assembled condenser 10 is put in a heating furnace, and brazing joining is performed. Thereby, the flow part in a pair of header tanks 15 and 16 and the inside of flat tube 12 are mutually connected.

  According to the condenser 10 having the above configuration, in the header tank 16 disposed below, the windbreak wall 153c is provided on the windward side of the air flow at the junction between the end of the flat tube 12 and the tube insertion hole 152a. Since the air is not directly applied to the joint portion, that is, the root portion of the flat tube 12, dust adhesion to the root portion of the flat tube 12 can be prevented.

  Further, since the windbreak wall 153c can be integrally formed with the tank plate 153, the manufacturing cost can be kept low. Further, since the fins 13 are disposed so as to protrude from the end of the flat tube 12 toward the windward side, the lower ends of the fins 13 can be closed by the windbreak wall 153c without any gap.

  Further, the windbreak wall 153 c is formed so that the upper end thereof closes the lower end of the fin 13, so that dust is not blown toward the root portion of the flat tube 12. Accordingly, it is possible to prevent dust from adhering to the root portion of the flat tube 12.

(Second Embodiment)
In the first embodiment described above, the fins 13 are arranged so as to protrude from the end of the flat tube 12 to the windward side of the air flow, but the fins 13 are arranged at the same position as the end of the flat tube 12. Also good. FIG. 5 is a cross-sectional view showing the configuration of the lower header tank 16 in the present embodiment. The fin 13 of this embodiment is arrange | positioned between the adjacent flat tubes 12, as shown in FIG. And it arrange | positions so that the edge part of the flat tube 12 and the edge part of the fin 13 may become the same position.

  And the upper end of the windbreak wall 153c is arrange | positioned so that the lower end of the fin 13 may be plugged up. Since the windbreak wall 153c is formed integrally with the header tank 16 on the windward side of the air flow at the joint portion, the blown air does not directly hit the joint portion, that is, the root portion of the flat tube 12, It is possible to prevent dust from adhering to the root portion of the flat tube 12.

(Other embodiments)
In the above embodiment, the inlet portion 18, the outlet portion 19, and the partition plate 155 are arranged in the upper header tank 15, but the inlet portion 18, the outlet portion 19, and the partition plate 155 are arranged in the lower header tank. 16 may be arranged. Moreover, although the distribution part in the upper header tank 15 was divided into two sections by the partition plate 155, it is not restricted to this.

  In the above embodiment, the windbreak wall 153c is formed integrally with the tank plate 153. However, the present invention is not limited to this, and the windbreak wall 153c is formed separately and joined to one of the side portions 153b. You may do it.

  Moreover, in the above embodiment, although the fin 13 was formed with the corrugated corrugated fin, it may be a plate fin. In this case, as shown in FIG. 6, the core portion 11 is composed of a plurality of flat tubes 12 and a plurality of plate-like fins 13 arranged orthogonal to the flat tubes 12. . That is, the core part 11 is formed by the fin and tube method.

  In this case, the windbreak wall 153c may be disposed on the windward side so as to close the gap between the fin 13 disposed at the lower end and the air passage side of the lower header tank 16.

It is a perspective view which shows schematic structure of the condenser in 1st Embodiment. It is sectional drawing which shows the structure of the lower header tank in 1st Embodiment. It is sectional drawing which shows the structure of the upper header tank in 1st Embodiment. (A) thru | or (c) is explanatory drawing which shows the process sequence of the tank plate in 1st Embodiment. It is sectional drawing which shows the structure of the lower header tank in 2nd Embodiment. It is a perspective view which shows the external appearance shape of the condenser in other embodiment.

Explanation of symbols

12 ... Flat tube 13 ... Fin 15, 16 ... Header tank (tank)
152 ... Core plate 152a ... Tube insertion hole (tube hole)
153 ... Tank plate 153a ... Central part 153b ... Both sides 153c ... Windbreak

Claims (4)

A plurality of flat tubes (12) which are stacked in a horizontal direction perpendicular to the air flow direction and through which fluid flows;
A pair of tanks (15, 16) arranged in the vertical direction, having a plurality of tube holes (152a) to which ends of the plurality of flat tubes (12) are joined, and communicating with the inside of the flat tubes (12). In a heat exchanger comprising:
The tank (16) disposed below has a windbreak wall (153c) on the windward side of the air flow at the joint between the end of the flat tube (12) and the tube hole (152a). The heat exchanger is formed in one piece. The tank (16) disposed below includes a flat core plate (152) in which the plurality of tube holes (152a) are formed, a central portion (153a) formed in a substantially U-shaped cross section, and a cross-sectional shape. A tank plate (153) having both sides (153b) formed in an L-shape, and crimped so that both sides (153b) of the tank plate (153) wind up on both sides of the core plate (152). And are caulked,
The heat exchanger according to claim 1, wherein the windbreak wall (153c) is formed on an extension of a caulking-fixed portion. Fins (13) are arranged between the adjacent flat tubes (12),
The heat exchanger according to claim 1 or 2, wherein the windbreak wall (153c) is formed so that an upper end thereof closes a lower end of the fin (13).   The heat exchanger according to claim 3, wherein the fin (13) is disposed so as to protrude further to the windward side than an end of the flat tube (12).

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