JP2010169289A - Bent heat exchanger and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bent heat exchanger and a method of manufacturing the same, capable of improving heat exchanging efficiency and being easily manufactured. <P>SOLUTION: In this bent heat exchanger in which each of a plurality of flat tube 3 for heat exchange arranged in parallel with each other, is bent at an intermediate section in the longitudinal direction, flat tubular sections 8 at both sides through the bent section 7 are communicated and connected with header pipes 2a, 2b, and corrugate fins 4 are respectively disposed between the flat tubes 3, the bent sections 7 are respectively composed of a lateral bent section 7a bent roughly into the S-shape in the width direction of the flat tube 3, and a longitudinal bent section 7b folded in the height direction of the flat tube 3 from a central section of the lateral bent section 7a, and end sections of the flat tubular sections 8 extending to the longitudinal bent sections 7b are inserted into slits 6 formed on the header pipes 2a, 2b and communicated and connected by brazing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bent heat exchanger and a method of manufacturing the same, and more specifically, a flat tube for heat exchange having header pipes connected to both ends is formed in a bent shape in the middle portion in the length direction. The present invention relates to a bent heat exchanger and a manufacturing method thereof.

  In general, for example, when a heat exchanger formed by brazing a header pipe made of aluminum (including an aluminum alloy), a heat exchange tube and a fin is used as an evaporator, for example, a heat exchanger is used to increase the heat radiation area. Means to stack two sheets are taken. However, when the heat exchanger is bent to secure the heat radiation area, the heat exchange tube is deformed when the bending angle is reduced, and thus bending cannot be performed enough to overlap. In particular, in a flat tube for heat exchange, bending in the width direction is very difficult.

  As a means for solving the above problem, the flat tube for heat exchange is refracted (bent) in the middle in the longitudinal direction, and the flat tube portions on both sides sandwiching the refracted portion (bent) are in the width direction. In the refracting heat exchanger having a predetermined angular rotation displacement state, the bent portion is composed of a bent portion in the flat tube height direction and twisted portions on both sides sandwiching the bent portion. In addition, it is known that the twisted portion is twisted by 90 ° or substantially 90 ° around the axis in the tube length direction (see, for example, Patent Document 1).

  In order to manufacture the heat exchanger described in Patent Document 1, the flat tube is twisted on both sides of the fixed length portion where the bent portion is to be formed, and the flat tube portions on both sides are turned into the bent portion. On the other hand, the tube is twisted by 90 ° around the axis in the tube length direction. Thereafter, a plurality of these flat tubes are arranged in parallel in the height direction of the flat tube portions on both sides, and corrugated fins are inserted and arranged between the flat tube portions sandwiching the portion that becomes the bent portion of the flat tube. In parallel with the fin assembly, the header pipes are assembled in communication with both ends of the flat tube. In this state, the heat exchanger assembly is collectively brazed, and the whole is joined and integrated. Then, the flat tube portion sandwiched between the twisted portions is subjected to bending bending at a position adjacent to the twisted portion so that the side edges in the width direction of the flat tube portions for heat exchange on both sides face each other. Processed to produce a heat exchanger with a bent structure.

Japanese Patent No. 3305460 (Claims, paragraphs 0018 to 0020, FIGS. 1 and 2)

  However, in the heat exchanger described in Patent Document 1, the bent portion is a state in which the bent portion in the height direction of the flat tube and the both sides sandwiching the bent portion are twisted by 90 ° around the axis in the tube length direction. Since it is comprised by a twist part, the pitch between flat tubes cannot be made narrower than the height of a bending part, ie, the width of a flat tube. Therefore, there is a limit to the pitch between the flat tubes, and there is a concern that the heat dissipation area cannot be sufficiently increased.

  Moreover, when manufacturing the heat exchanger of patent document 1, in order to perform a bending bending process in the state which integrally brazed the flat tube which formed the bending-shaped part, the corrugated fin, and the header pipe, a processing apparatus is large-scale. In addition, there is a problem that processing costs increase.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bent heat exchanger that can improve the heat exchange efficiency and that can be easily manufactured, and a method for manufacturing the same.

  In order to achieve the above object, a bent heat exchanger according to the present invention includes a plurality of heat exchanging flat tubes that are parallel to each other, bent in the middle in the longitudinal direction, and both sides sandwiching the bent portion. A bent heat exchanger in which the flat tube portion is connected to the header pipe and heat exchange fins are interposed between the flat tubes, and the bent portion extends in the width direction of the flat tube. It is characterized by comprising a laterally bent portion bent in a substantially S-shape and a vertically bent portion folded back in the flat tube height direction from the central portion of the laterally bent portion (claim 1).

  By comprising in this way, a heat exchanger can be comprised, without crushing the inside of the flat tube for heat exchange, and the state which narrowed the pitch between this flat tube.

  In the present invention, the flat tube portion of the flat tube is connected in communication with a plurality of slits arranged at equal intervals in the height direction of both header pipes. At this time, the two flat tube portions have different heights. It is preferable that the slits are connected to the slits or the slits having the same height are connected to the slits (claims 2 and 3).

  By comprising in this way, each flat tube can be assembled | attached at equal intervals in the height direction of a header pipe with a narrow pitch.

  Moreover, the manufacturing method of the bending heat exchanger of this invention is a manufacturing method of the bending heat exchanger in any one of Claim 1 thru | or 3, Comprising: The said flat tube is the said longitudinal direction intermediate part. A step of bending the flat tube in a substantially S shape in the width direction to form a horizontal bent portion, a step of turning the flat tube from the center of the horizontal bent portion in the height direction to form a vertical bent portion, and the flat portion Insert the flat tube sections that extend into the vertical bend of the tube into slits arranged at equal intervals in the height direction of the header pipe, and interpose heat exchange fins between the flat tube sections. And a step of heating and brazing the assembled flat tube, header pipe, and heat exchange fin together (Claim 4).

  By configuring in this way, the flat tube is bent in a substantially S shape in the width direction of the flat tube at the intermediate portion in the longitudinal direction to form a horizontal bent portion, and then the flat tube is formed from the central portion of the horizontal bent portion. The bent portion can be formed in the flat tube by folding back in the height direction to form the vertically bent portion. In addition, the flat tube portion extending to the vertical bent portion of the flat tube is inserted into slits arranged at equal intervals in the height direction of the header pipe, and heat exchange fins are provided between the flat tube portions. After interposing and assembling, the flat tube, the header pipe and the heat exchange fin can be heated and integrally brazed to produce a bent heat exchanger.

  (1) According to the first, second, and third aspects of the present invention, the heat exchange efficiency can be reduced because the inside of the heat exchanging flat tube is not crushed and the pitch between the flat tubes can be reduced. Can be improved.

  (2) According to the invention described in claim 4, it is possible to easily manufacture a bent heat exchanger without using a large bending apparatus.

1 is a schematic perspective view showing a first embodiment of a bent heat exchanger according to the present invention. It is a top view of the said heat exchanger. It is a front view of the said heat exchanger. It is a rear view of the said heat exchanger. It is a right view of the said heat exchanger. It is a cross-sectional perspective view which shows the flat tube for heat exchange in this invention. It is a perspective view (a) which shows the header pipe in this invention, and an expanded sectional view (b) which follows the II line | wire of (a). It is a schematic perspective view which shows 2nd Embodiment of the bending heat exchanger which concerns on this invention. It is a front view of the heat exchanger of 2nd Embodiment. It is a right view of the heat exchanger of 2nd Embodiment. It is a schematic perspective view which shows the process sequence which forms a bending-shaped part in the flat tube in this invention.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated in detail based on an accompanying drawing.

<First Embodiment>
As shown in FIGS. 1 to 5, the heat exchanger 1 according to the present invention includes a pair of aluminum (including aluminum alloy) header pipes 2a and 2b adjacent to each other, and the header pipes 2a and 2b. A plurality of aluminum flat tubes 3 for heat exchange (hereinafter referred to as flat tubes 3), which are bent in a substantially U shape in plan view, connected in parallel, and made of aluminum interposed between adjacent flat tubes 3 The corrugated fin 4 is brazed. An aluminum end cap 5 is brazed to the upper and lower opening ends of the header pipes 2a and 2b.

  As shown in FIGS. 1 and 7, the header pipes 2a and 2b are formed of, for example, a pipe member made of an extruded aluminum material, and one side thereof is equidistant along the longitudinal direction. A plurality of horizontally long slits 6 are arranged in a row. In this case, an expansion taper surface 6a that expands outward is formed at the upper and lower portions of the opening end of the slit 6 (see FIG. 7).

  The flat tube 3 is formed of an aluminum extruded shape having a plurality of divided communication passages 3a, and is bent at the middle portion in the longitudinal direction as shown in FIGS. The flat tube portions 8 on both sides sandwiching the bent portion 7 are inserted into the slits 6 of the header pipes 2a and 2b and are connected to each other by brazing. In this case, the bent portion 7 is folded back in the height direction of the flat tube 3 from the lateral bent portion 7a bent in a substantially S shape in the width direction of the flat tube 3 and the central portion of the horizontal bent portion 7a. It consists of the vertical bending part 7b, and is formed in the substantially horizontal U shape in planar view and front view.

  The ends of the two flat tube portions 8 extending to the bent portion 7 of the flat tube 3 formed as described above are arranged at equal intervals in the height direction of the adjacent header pipes 2a and 2b. The plurality of flat tubes 3 are connected in parallel to each other, and are connected to the slits 6 having different heights among the plurality of slits 6. At this time, the corrugated fins 4 are interposed between the flat tubes 3, and the header pipes 2a and 2b, the flat tubes 3 and the corrugated fins 4 are integrally brazed.

<Second Embodiment>
In the first embodiment, one end of the plurality of slits 6 in which the ends of the two flat tube portions 8 of the flat tube 3 are arranged at equal intervals in the height direction of the adjacent header pipes 2a and 2b, respectively. Although the case where it connects to the slit 6 of different height was demonstrated, as shown in FIG. 8 thru | or 10, the edge part of both the flat tube parts 8 of the flat tube 3 is connected to the adjacent header pipes 2a and 2b. It is also possible to communicate with the slits 6 having the same height among the plurality of slits 6 arranged at equal intervals in the height direction. In this case, both the flat tube portions 8 of the flat tube 3 are inclined in a direction approaching from the bent portion 7 toward the end portion, but the inclination angle is slight, and the flat tube 3 is elastically deformable. Therefore, it is possible to absorb the inclination angle at both end portions and make them substantially parallel. Moreover, since the expansion taper surface 6a which spreads outward is formed in the upper and lower parts of the opening end of the slit 6 provided in the header pipes 2a and 2b, the inside of the flat tube 3 into the slit 6 is formed. Insertion becomes easy, and the communication connection between the flat tube 3 and the header pipes 2a and 2b can be ensured.

  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.

<Method of manufacturing bent heat exchanger>
Next, the manufacturing method of the heat exchanger which concerns on this invention is demonstrated. First, in assembling the heat exchanger, a pair of header pipes 2a and 2b in which a plurality of slits 6 are arranged at equal intervals in the height direction, that is, the length direction, and the bent portion 7 in the following procedure. Corrugated fins 4 coated with, for example, clad fins 4 and a plurality of brazing materials interposed between the flat tubes 3 are prepared.

  As shown in FIG. 11, the procedure for forming the bent portion 7 in the flat tube 3 is as follows. First, a straight flat tube formed of an extruded aluminum member having a plurality of divided communication passages 3a. 3 is prepared (see FIG. 11A). Next, the intermediate portion of the flat tube 3 is bent in a substantially S shape in the width direction (horizontal direction) to form a laterally bent portion 7a (see FIG. 11B). Next, the vertical bent portion 7b is formed by folding back about 180 ° in the height direction (vertical direction) of the flat tube 3 with respect to the center portion of the lateral bent portion 7a, that is, the center line 9 (FIG. 11 (c), ( d)). In this state, the flat tube 3 is formed in a substantially horizontal U shape in plan view and front view.

  By forming the bent portion 7 of the flat tube 3 as described above, the flat tube 3 having the bent portion 7 having a small height with respect to the width of the flat tube 3 without collapsing the communication path 3a. Obtainable. Therefore, the pitch between the plurality of flat tubes 3 can be reduced.

  Next, the end portions of the flat tube portion 8 extending to the vertical bent portion 7b of the flat tube 3 formed as described above are arranged at equal intervals in the height direction of the header pipes 2a and 2b. In addition to being inserted into the slits 6, the corrugated fins 4 are interposed between the flat tube portions 8 of the flat tubes 3. At this time, a brazing material is disposed in the vicinity of the slit 6 of the header pipes 2a and 2b into which the ends of the flat tube 3 are inserted, or a powdery brazing material is applied. The header pipes 2a and 2b, the flat tubes 3 and the corrugated fins 4 assembled in this way are fixed by a holder (not shown).

  Next, the assembled header pipes 2a and 2b, the flat tubes 3 and the corrugated fins 4 are carried into a furnace, heated to a temperature of about 600 ° C. and integrally brazed to manufacture a bent heat exchanger.

<Other embodiments>
In the above embodiment, the case where the header pipes 2a and 2b are made of a pipe member formed of an aluminum extruded shape has been described. However, instead of the aluminum extruded shape, an aluminum plate clad with a brazing material is used. You may use the electric sewing tube which formed the member in the cylindrical shape.

  Further, in the above embodiment, the case where the pair of header pipes 2a and 2b are arranged adjacent to each other has been described. However, the structure is not necessarily such, and the header pipes 2a and 2b are arranged apart from each other. There may be. In this case, the S-shaped bend of the lateral bent portion 7a of the flat tube 3 may be increased.

  The bent heat exchanger according to the present invention can be used for, for example, an evaporator and a condenser in an automobile and a building air conditioning system. It can also be used for evaporators and condensers in refrigeration systems.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2a, 2b Header pipe 3 Flat tube 4 Corrugated fin 6 Slit 7 Bending part 7a Lateral bending part 7b Vertical bending part 8 Flat pipe part 9 Centerline

Claims (4)

Each of the plurality of flat tubes for heat exchange parallel to each other is bent at the middle portion in the longitudinal direction, the flat tube portions on both sides sandwiching the bent portion are connected to the header pipe, and each flat tube A bent heat exchanger having heat exchange fins in between,
The bent portion is composed of a laterally bent portion that is bent in an approximately S shape in the width direction of the flat tube, and a vertical bent portion that is folded back in the flat tube height direction from the central portion of the horizontal bent portion. A bent heat exchanger characterized by that. The bent heat exchanger according to claim 1, wherein
The flat tube portion of the flat tube is connected to a plurality of slits arranged at equal intervals in the height direction of both header pipes. At this time, both the flat tube portions are connected to the slits having different heights. A bent heat exchanger characterized by being connected. The bent heat exchanger according to claim 1, wherein
The flat tube portion of the flat tube is connected to a plurality of slits arranged at equal intervals in the height direction of both header pipes. At this time, both flat tube portions are connected to the slits having the same height. A bent heat exchanger characterized by the above. A method for manufacturing a bent heat exchanger according to any one of claims 1 to 3,
Bending the flat tube in a substantially S shape in the width direction of the flat tube at the middle in the length direction thereof to form a laterally bent portion;
A step of forming a vertical bent portion by folding back in the flat tube height direction from the central portion of the lateral bent portion;
Insert the flat tube part that extends into the vertically bent part of the flat tube into the slits arranged at equal intervals in the height direction of the header pipe, and interpose heat exchange fins between the flat tube parts And assembly process,
Heating the assembled flat tube, header pipe and heat exchange fin and brazing together;
A method for producing a bent heat exchanger, comprising:

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