JPH0545488U - Heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] In a heat exchanger in which a large number of flat tubes are arranged between cylindrical headers, the brazing properties of the header and tubes are improved, and the flexibility of the header for various specifications is improved. [Structure] A heat exchanger in which a large number of flat tubes having both ends connected to the headers are arranged in parallel between a pair of cylindrical headers, and corrugated fins are interposed between the flat tubes. In the above, the header is constructed by stacking a number of short tubular bodies 9 corresponding to the number of flat tubes 3, and the width w is equal to the width of the flat tubes at the peripheral edges of both ends of each short tubular body 9. The cutouts 11 and 12 opened outward in the axial direction are provided, and the bases 11 of the cutouts at both ends of these cutouts 11 and 12 are provided.
The distance g between a and 12a is set to be the same as the adjacent flat tubes 13-A,
Make it equal to the gap between 13-B. The partition plate 5 is fitted in the appropriately selected short-sized tubular body 9-C.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat exchanger having a core composed of flat tubes and corrugated fins between a pair of cylindrical headers.

[0002]

[Prior art]

 In such a heat exchanger, the header and the flat tube have to be connected to each other so that they are in communication with each other, but this connection has conventionally been generally performed as shown in FIG.

That is, a plurality of tube holes 03 corresponding to each flat tube 01 are arranged in a row at a predetermined interval in one cylindrical header 02 that extends by connecting the end portions of many flat tubes 01. The ends of the flat tubes 01 were fitted into the tube holes 03, and fixed by brazing or the like. 04 is a corrugated fin.

Further, even when a partition plate 05 is provided on the header 02 in order to flow the fluid in a meandering manner from the illustrated header 02 to another header and then from the other header to the header 02, the header 02 is also divided. It is a general practice to provide a plate insertion hole 06, insert the partition plate 05 into the header 02 through the insertion hole 06, and fix it by brazing.

Japanese Utility Model Laid-Open No. 1-157978 discloses a heat exchanger in which a header (cylindrical body) is formed as a brazing joint assembly in which a plurality of cylinder elements are combined at a partition plate position in an end fitting relationship. Although shown, in this heat exchanger as well, a plurality of flat tubes are joined to each tubular element in the same manner as in FIG.

[0006]

[Problems to be solved]

 In the conventional heat exchanger that processes multiple tube holes in one header as described above, each tube hole must be processed in the correct position in accordance with the intervals of the flat tubes. If the individual tube holes themselves are not accurately machined according to the shape of the flat tube, brazing between the head and the flat tube will be defective, and there will be problems such as not being able to obtain a liquid-tight joint. Yes, it was difficult to process the tube hole.

Furthermore, different headers had to be prepared for each product (heat exchanger) having different tube stages and partition plate positions.

[0008]

[Means and Actions for Solving the Problems]

 The present invention has been made in view of such circumstances, and in the present invention, a large number of flat tubes having both ends connected to these headers are connected in parallel between a pair of cylindrical headers. In the heat exchanger having the flat tubes and corrugated fins interposed between the flat tubes, the header is formed by stacking a number of short tubular bodies corresponding to the number of the flat tubes. A cutout portion having a width equal to the width of the flat tube and opening outward in the axial direction is provided at the peripheral edge portions of both ends of each of the short tubular bodies. Equal to the gap between the flat tubes.

According to the present invention, the leading end of one flat tube is fitted into the cutout portion at one end of one short tubular body, and the flat tube is sandwiched in the short tubular body to insert the next short tubular tube. By stacking the tubular bodies, fitting the notches provided at the opposite ends of the next short tubular body into the flat tubes, and repeating such operations one after another, a large number of short tubular bodies are formed. A large number of flat tubes are assembled at equal intervals in a single body header.

The short tubular body thus assembled and the flat tube are joined by brazing, but the flat tube is sandwiched in the notches provided on the short tubular bodies on both sides of the flat tube. Since the brazing filler metal can be placed evenly over the entire circumference between the flat tube and the notch, it is possible to ensure that there is no defect in the liquid-tight brazing part. can get.

Also, by adjusting the number of short tubular bodies to be stacked, the total length of the header and the number of tubes can be freely adjusted, and the mounting position of the partition plate is also an appropriate short tubular shape. It can be changed arbitrarily by selecting a body and attaching a partition plate to it. Therefore, if you prepare only one type of short tubular body, various heat exchangers with different tube stages and partition plate positions can be used. It is not necessary to prepare separate headers for each type of heat exchanger as in the past.

[0012]

【Example】

 FIG. 1 is an overall front view of a heat exchanger 1 according to an embodiment of the present invention. This heat exchanger 1 is configured by connecting cylindrical headers 2L and 2R vertically arranged on both left and right sides with a large number of horizontal flat tubes 3, and each flat tube 3 has corrugated fins 4. It is attached. The inside of each flat tube 3 communicates with the inside of the headers 2L and 2R, respectively.

The inside of the left header 2L is divided into three upper, middle and lower sections by two partition plates 5, and the inside of the right header 2R is divided into two upper and lower sections by one partition plate 5. ing . Further, a medium inlet 6 is provided at the upper end of the header 2L, and a medium outlet 7 is provided at the lower end, so that a medium such as cooling water of a water-cooled engine is introduced from the engine to the heat exchanger 1 via the inlet 6. After being cooled by the heat radiation effect of the corrugated fins 4 while flowing through the flat tube 3, it is returned from the outlet 7 to the engine. Since the partition plates 5 are provided on the headers 2L and 2R as described above, the medium introduced from the inflow port 6 first passes from the upper chamber of the header 2L through the flat tube 3 to the upper chamber of the header 2R. Then, after flowing in the core 8 in a meandering manner from the upper chamber to the middle chamber of the header 2L, from the middle chamber to the lower chamber of the header 2R, and further from the lower chamber to the lower chamber of the header 2L, It flows out from the outlet 7.

By the way, each of the headers 2L and 2R is divided into a number of short tubular bodies 9 equal in number to the flat tubes 3, and these short tubular bodies 9 are stacked and joined together. Has been done. All of these short tubular bodies 9 have the same size and structure. However, the inlet 6 is provided in the short tubular body 9 located at the upper end of the left header 2L, and the outlet 7 is provided in the short tubular body 9 located at the lower end. The upper opening of the short tubular body 9 located at the upper end of the right header 2R and the lower opening of the short tubular body 9 located at the lower end are both closed.

The detailed structure of the short cylindrical body 9 will be described below with reference to FIGS. 2 and 3. 2 is a cross-sectional view of the partition plate 5 of the header 2R and its vicinity, and FIG. 3 is an exploded perspective view thereof.

Each short tubular body 9 is composed of an upper portion 9a having a relatively small diameter and an enlarged lower portion 9b, and the inner diameter of the lower portion 9b is formed to be substantially equal to the outer diameter of the upper portion 9a. A circumferential step 10 (FIG. 2) is formed between the inner surface of 9a and the inner surface of the lower portion 9b. Then, notches 11 and 12 are formed at the upper end of the upper part 9a and the lower end of the lower part 9b by notching a part of the peripheral wall in the circumferential direction and opening upward and downward respectively. These notches 11 and 12 are provided in positions aligned in the axial direction (vertical direction), and their width w is equal to the width of the flat tube 3, and the bottom sides 11a of the notches 11 and the bottom sides of the notches 12 are the same. The distance from 12a is set equal to the gap g to be formed between the flat tubes 3 and 3 adjacent to each other when the heat exchanger is completed.

The portion of the header 2R shown in FIGS. 2 and 3 is assembled as follows. First, insert the end of the flat tube 3-A into the notch 11 of the lower short tubular body 9-A from above, and then insert the lower portion 9b of the middle short tubular body 9-B into the short tubular shape. The upper part 9a of the body 9-A is fitted from above and pushed downward. In the short tubular body 9-B, the flat tube 3-A is composed of the bottom side 11a of the cutout 11 of the short tubular body 9-A and the bottom side 12a of the cutout 12 of the short tubular body 9-B. Stop where it is caught. Next, similarly, the end of the flat tube 3-B is fitted into the cutout portion 11 of the short cylindrical body 9-B, and the upper short cylindrical body 9-C is similarly fitted from above. However, the partition plate 5 should be mounted in advance on the short tubular body 9-C. The partition plate 5 is inserted and mounted in the short cylindrical body 9-C from the opening of the lower portion 9b. At this time, the step portion 10 serves as a stopper, and the partition plate 5 is the step portion. Positioned in place by 10.

The other parts of the header 2R and the header 2L are assembled by sequentially repeating the same procedure, and finally the heat exchanger as shown in FIG. 1 is assembled, but at the time of this assembly, the parts to be joined are joined together. A brazing filler metal is inserted or applied and the entire assembly is heated in a heating furnace to braze each joint.

In this embodiment, the assembly of the header and the flat tube is not performed by inserting the flat tube into the tube hole opened in the tube wall of the header as in the conventional case, but rather as described above. As described above, for example, by fitting the flat tube 3-A with the cutout portion 11 of the short tubular body 9-A from the lower side and the cutout portion 12 of the short tubular body 9-B from the upper side, A sufficient amount of brazing material can be evenly provided by surrounding the flat tube 3 between the flat tube 3 and the notches 11 and 12, and the upper and lower short tubular members 9 can slide in the axial direction with respect to each other. Since it is movable, the flat tube 3 is pinched by the bottom side 12a of the cutout portion 12 of the upper short tubular body 9 and the bottom side 11a of the cutout portion 11 of the lower short tubular body 9, and the tube and the header. The clearance between the Cormorant with is obtained.

The number of tube stages of the obtained heat exchanger and the corresponding total length of the headers 2L and 2R can be freely adjusted by adjusting the number of short tubular bodies 9 to be stacked, and The position of the partition plate 5 provided in the headers 2L and 2R can be freely adjusted by appropriately selecting the short cylindrical body 9 into which the partition plate 5 is inserted. Therefore, by preparing a large number of only one type of short tubular body 9 having the same size, shape, etc., it is possible to deal with various heat exchangers having different numbers of tube stages and partition plate positions. It is not necessary to prepare separate headers for each heat exchanger model.

[0021]

[Effect of the device]

 As described above, according to the present invention, a large number of flat tubes having both ends connected to these headers are arranged in parallel between a pair of cylindrical headers, and a corrugated tube is provided between the flat tubes. In the heat exchanger with fins, the brazing part between the header and the flat tube can be made very good without any defects, and only one type of short tubular body is available. It can be used for various heat exchangers with different numbers of tube stages and partition plate positions.

[Brief description of drawings]

FIG. 1 is an overall front view of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a part of the heat exchanger.

FIG. 3 is an exploded perspective view of a portion shown in FIG.

FIG. 4 is a partially exploded perspective view of a conventional heat exchanger.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat exchanger, 2 ... Header, 3 ... Flat tube, 4 ... Corrugated fin, 5 ... Partition plate, 6 ... Inflow port, 7 ... Outflow port, 8 ... Core, 9 ... Short cylindrical body, 10 ... Stage Part, 11, 12 ... Notch.

Claims (1)

[Scope of utility model registration request] 1. A plurality of flat tubes having both ends connected to these headers are arranged in parallel between a pair of cylindrical headers, and a corrugated fin is interposed between the flat tubes. In the exchanger, the header is constructed by stacking a number of short tubular bodies corresponding to the number of the flat tubes, and the width is equal to the width of the flat tubes at the peripheral edges of both ends of each short tubular body. A heat exchanger characterized in that notch portions that are equal and open outward in the axial direction are provided, and a gap between the bases of the notch portions at both ends is made equal to a gap between the adjacent flat tubes.