JPH02309196A - Heat exchanger and manufacture of header - Google Patents

Abstract

PURPOSE:To facilitate formation of a header with an insertion hole by a method wherein a header has a cylinder body formed by bending a flat material having an insertion hold for a tube or by combing a flat material having an insertion hole for a tube and other plate. CONSTITUTION:Heat exchange is carried out between the flowing fluids on the inside and outside of tubes 2 provided with a plurality of interior fluid passages. A header 4 is a cylindrical tank connected to both ends of each tube 2, and it is provided to distribute and guide a supplied fluid to each tube 2 or collect the fluid passing through each tube 2. A cylinder body 5 is formed such that a flat plate 8 made of the same material as that of the tube 2 is bent in the shape of a cylinder and a cover 9 is attached over the seam 8a by brazing. This constitution facilitates formation of the header 4 having an insertion hole 11.

Description

[Detailed description of the invention] "Industry" field of use] The present invention relates to a method of manufacturing a heat exchanger and its header.

[Prior Art] As a conventional heat exchanger, a technique disclosed in Japanese Patent Application Laid-Open No. 161394/1983 is known. This technology involves inserting a tube whose surface is clad with brazing material into an insertion hole formed in a cylindrical header, and brazing the tube and header in this inserted state to bond and secure the tube and header. It is something.

As shown in this technique, the header has a cylindrical shape and -
A shows a cylindrical shape from the viewpoint of pressure resistance. and,
The insertion hole for the tube was formed by directly punching a hole in the pipe using a method such as press working.

[Problem to be solved by the invention] Pressing to form an insertion hole in a pipe is a process that involves inserting a female mold into the pipe, then opening a push-in hole by press working, and then pulling out the female mold from the pipe. Become. In particular, when removing the female mold from the pipe, the particles generated during the formation of the insertion hole get caught in the female mold, making it more difficult to pull out the female mold than the pipe.

In other words, since the conventional header had an insertion hole formed in the pipe, it was difficult to form a header with a push-in hole. For this reason, conventional headers have had the problem of poor productivity.

An object of the present invention is to provide a method for manufacturing a heat exchanger and its header with improved productivity.

[Measures Pi for Solving the Problems] In order to achieve the above object, the heat exchanger and the method for manufacturing its header of the present invention employ the following technical means.

(First invention) A heat exchanger includes a plurality of tubes and a header connected to the ends of the plurality of tubes. The header includes a cylindrical body formed by bending a flat plate having a hole for inserting the tube, or by combining a flat plate having a hole for inserting the tube with another plate.

(Second invention) The heat exchanger header includes the following two manufacturing steps.

A first step of forming a flat plate material having an insertion hole into which a tube is inserted. A second step of forming a cylindrical body by bending the flat plate material with the insertion hole formed therein or by combining the flat plate material with the insertion hole formed with another plate material.

[Action] (Action corresponding to the first invention)! By bending the material to form a cylinder, the flat plate material from which the cylinder is constructed can be provided with a push-in hole into which the tube is inserted. Similarly, by forming a cylindrical body by combining a flat plate material and another plate material, the flat plate material before the cylindrical body is formed can be provided with an insertion hole into which a tube is inserted.

Then, the flat plate material with the push-in holes formed therein is bent into a cylindrical shape, and the mating portions are closed to form a cylindrical body.

Alternatively, a cylindrical body is formed by combining the flat plate material in which the push-in hole is formed with another plate material and closing the mating portion.

(Action corresponding to the second invention) First, a flat plate material having an insertion hole into which a tube is inserted is formed. This may be done by forming a push-in hole in a flat plate material by press working, cutting side technique, etc., or by forming a flat plate material with a push-in hole for a tube by a casting or molding technique.

Next, the flat plate material with the push-in holes formed therein is bent into a cylindrical shape such as a cylinder or square tube, and then the mating portions are closed to form a cylindrical body. Alternatively, a cylindrical body is formed by combining a flat plate material with a push-in hole with another plate material, and then the mating portion is closed to form a cylindrical body.

In addition, the above-mentioned methods for closing the mating portions include (a) attaching another plate material to the mating portion and closing the gap between the mating portions, and (b) overlapping the ends of the flat plates and brazing or There are two methods: joining by caulking, etc., and (c) joining the ends of flat plates together, and closing the ends by brazing, welding, etc.

In this way, the cylindrical body of the header is formed.

[Effects of the Invention] (Effects of the Invention Corresponding to the First Invention and the Second Invention) The technology for forming a flat plate material with a push-in hole for inserting a tube is different from the conventional technology for forming a push-hole for a tube in a pipe. It's easy in comparison. For this reason, it is necessary to form a cylindrical body from a flat plate material compared to the conventional method, but as a result, it becomes easier to form a header provided with a hole for inserting the tube.

In other words, it is possible to improve the productivity of the header and, by extension, the productivity of the heat exchanger, compared to the conventional method.

[Example 2] Next, a method of manufacturing a heat exchanger and a header thereof according to the present invention will be explained based on an example shown in the drawings.

1 to 5 show a first embodiment of the present invention, and FIG. 5 shows a perspective view of a heat exchanger.

The heat exchanger 1 is, for example, a refrigerant 11 of an automobile refrigeration cycle.
Used in WJ units, refrigerant evaporators, etc. The heat exchanger 1 of this embodiment is roughly divided into a plurality of tubes 2, corrugated fins 3, and a header 4.

First, tube 2 will be explained. The tube 2 exchanges heat between the fluid flowing therein and the fluid passing between the tubes 20, and has a plurality of fluid passages formed therein. Further, the tube 2 is a tube with a flat cross section, and is made of a metal material with excellent corrosion resistance, such as brass or aluminum.

Next, the corrugated fin 3 will be explained. The corrugated fin 3 is joined to the tubes 2 while being sandwiched between the tubes 2. This improves the heat exchange efficiency of The corrugated fin 3 is formed by bending a band-shaped, extremely thin plate material made of the same metal material as the tube 2 into a wave shape. In addition, corrugate fin 3 has
Usually, a large number of louvers are formed in order to improve heat exchange efficiency.

Next, header 4 will be explained. The header 4 is a cylindrical tank that is connected to both ends of each tube 2 and distributes and guides the fluid supplied in the header 4 to each tube 2, or collects the fluid that has passed through each tube 2. The header 4 of this embodiment includes a cylinder 5, a cap 6, and a union 7.
It becomes by combining.

The cylindrical body 5 is made by bending a flat flat plate 8 (see FIG. 3) into a cylindrical shape (see FIG. 4) made of the same material as the tube 2, and a joining portion 8a of the bent cylindrical flat plate 8. A cover 9 is attached to the top by brazing (see Fig. 1). Note that by brazing the cover 9 to the mating portion 8a, the gap between the mating portions 8a is reduced. As shown in FIGS. 1 and 2, the flat plate 8 is provided with a cover 9.
A plurality of burring part insertion holes 11 are provided into which burring parts 10 formed in the burring part 10 are inserted. This burring part insertion hole 11 is formed before the flat plate material 8 is bent into a cylindrical shape (see FIG. 3), and will be described in detail later.

The cover 9 is a means for closing the mating portion 8a of the flat plate material 8, and also guides the end of the tube 2 into the inside of the cylindrical flat plate material 8 as shown in FIGS. 1 and 2. This will be explained later.

The cap 6 is a lid body attached to each end of the cylindrical body 5 by brazing.

The unions 7 are fluid receiving and passing means attached to each other end of the cylindrical body 5 by brazing, and one union 7 is connected to a pipe for supplying fluid into one header 4. . Further, the other union 7 is connected to a pipe that guides the fluid in the other header 4 to the outside.

Then, the flat plate material 8 bent into a cylindrical shape, the cover 9, the cap 6, and the union 7 constituting the header 4 are brazed together with the tube 2 and the corrugated fins 3 at the same time.

Next, the manufacturing process of the above cylinder 5 will be explained.

(1) A plurality of burring insertion holes 11 are formed in the flat plate 8 made of the same material as the tube 2 by press working (see FIG. 3). This burring part insertion hole 11 is
This is a hole formed in the cover 9 into which a burring part 10 (described above) is inserted, and the inner dimension is slightly larger than that of the burring part 10.

(2) The flat plate material 8 in which the burring part insertion hole 11 is formed is bent into a cylindrical shape by press working (see FIG. 4). As a result, the burring part insertion holes 11, which were formed separately at both ends of the flat plate material 8, coincide.

(3), apart from the steps (1) and (2) above, tube 2
A plurality of burring parts 10 are formed by burring on a flat plate made of the same material as .

During this burring process, the plate material that will become the cover 9 is bent by two press holes so that it follows the cylindrical body 5, that is, so that its cross section draws an arc (see FIG. 4).

Note that the burring portion 10 is a hole along the tube 2 in which a flange is formed. Further, the inner dimension of the hole of the burring portion 10 is formed to be slightly larger than the outer diameter of the tube 2.

(4) Insert the end of the tube 2 into each burring part 10 of the cover 9. At this time, the tube 2 is made into a laminated body with corrugated fins 3 interposed therebetween, and is held by a jig. For this reason, one end of the plurality of tubes 2 can be inserted into each burring part 10 by - times of assembly operations.

(5), cylindrical flat plate material 8 formed by the above (2)
is combined with the cover 9 of the above (4) to form the cylinder 5. This assembly is completed by inserting each burring part 10 of the cover 9 into the burring part insertion hole 11 of the cylindrical flat plate member 8.

(6)! Later, Cap 6j! >Union 7 to cylinder 5
By assembling the heat exchanger 1, the assembly of the heat exchanger 1 is completed.

(7) Thereafter, the components of the heat exchanger 1 held by the jig are inserted into the furnace, and the components of the heat exchanger 1 are brazed.

Note that (1) above corresponds to the first step of the second invention, and (2) to (7) above correspond to the second step of the second invention.

The header 4 of the heat exchanger 1 having the above configuration includes the tube 2
(in this example, the burring part insertion hole 11
However, the tube 2 is directly inserted into the burring part 10) when it is a flat plate (before forming an ffi shape). This technique is easier than the conventional technique of forming a tube insertion hole in a pipe. As a result, the header 4 can be formed more easily than in the past.

In other words, the productivity of the header 4 and, by extension, the productivity of the heat exchanger 1 is improved compared to the conventional method.

Further, since the insertion hole (burring part 10) of the tube 2 is directly formed when the plate is flat (before forming a cylindrical shape), it becomes possible to perform burring on the insertion hole of the tube 2. As a result, the joint area between the header 4 and the tube 2 is increased, and the ease of assembling the header 4 and the tube 2 is improved compared to the past.

FIG. 6 shows a second embodiment.

In this embodiment, the cylindrical body 5 of the header 4 is formed from a flat plate material 12 and a metal plate material 13. The flat plate material 12 is provided with an insertion hole 14 (burring part) for the tube 2, and has an arcuate cross section. For example, it is a plate-shaped member bent into a cross section of C\ or U-shape. The other plate material 13 is a plate-shaped member whose cross section is an arc, for example, bent into a C-shaped or U-shaped cross section, and which is combined with the flat plate material 12 provided with the insertion hole 14 to form the cylinder 5. Then, the flat plate material 12 and the other plate material 1
3 is joined by brazing. Note that the insertion hole 14 of the tube 2 does not need to be burred.

FIG. 7 shows a third embodiment.

In this embodiment, the mating portion 8a of the flat plate material 12 is provided at a different position from the insertion hole 15 of the tube 2, and the mating portion 8a is located at a position opposite to the insertion hole 15 of the tube 2. exemplify. The joining portion 8a is formed by joining the arc-shaped cover 16 by a joining method such as brazing,
The mating portion 8a is closed.

FIG. 8 shows a fourth embodiment.

In this embodiment, the ends (joint parts aa) of flat plate materials 12 bent into a cylindrical shape are overlapped and brazed together.

FIG. 9 shows a fifth embodiment.

In this embodiment, the joint portion 8 of the flat plate material 12 bent into a cylindrical shape is
A is closed by caulking.

(Modified example) In this embodiment, an example was shown in which the present invention was applied to a heat exchanger for an automobile refrigeration cycle, but it can also be used not only for a heat exchanger for a household or commercial refrigeration cycle, but also for a heater core, radiator, etc.
It is applicable to oil coolers, intercoolers, and other gas-gas heat exchangers, gas-liquid heat exchangers, and liquid-liquid heat exchangers.

The corrugated fins shown in this embodiment are not particularly necessary and may not be provided depending on the application.

The header does not have to be cylindrical, and may have other shapes.

The header does not need to be provided at both ends of the tube, and may be provided only at one end.

[Brief explanation of drawings]

1 to 5 show a first embodiment of the present invention, FIGS. 1 and 2 are cross-sectional views of the header portion of the heat exchanger, and FIGS. 3 and 4 are cross-sectional views of the cylindrical body 5. FIG. 5, which is an explanatory diagram of the manufacturing method, is a perspective view of the heat exchanger. FIG. 6 is a sectional view of a header showing a second embodiment of the present invention. FIG. 7 is a sectional view of a header showing a third embodiment of the present invention. FIG. 8 is a sectional view of a header showing a fourth embodiment of the present invention. FIG. 9 is a sectional view of a header showing a fifth embodiment of the present invention. In the figure 2...Tube 4...Header 5...Cylinder 8...Flat material 11...Burring part insertion hole (tube insertion hole)

Claims (1)

[Claims] 1) A heat exchanger comprising a plurality of tubes and a header connected to the ends of the plurality of tubes, wherein the header is formed by bending a flat plate material having insertion holes for the tubes. 1. A heat exchanger comprising a cylindrical body formed by forming or combining a flat plate material having an insertion hole for the tube and another plate material. 2) A method for manufacturing a header for a heat exchanger comprising the following steps. (a) A first step of forming a flat plate material having an insertion hole into which a tube is inserted. (b) bending the flat plate material in which the insertion hole is formed;
Alternatively, a second step of forming a cylindrical body by combining the flat plate material in which the insertion hole is formed with another plate material.