JPH0394941A - Manufacture of tube for heat exchanger - Google Patents

Abstract

PURPOSE:To easily obtain the tube having plural passages by inserting a waveform plate into the inside of a tube stock, squeezing flatly the tube stock in the direction being orthogonal to the axial direction, squeezing flatly both end parts of the tube stock in the direction intersecting with the squeezing direction and forming a connecting port. CONSTITUTION:A tube stock K is squeezed a little in the direction being orthogonal to the axial direction, and also, to the extent that it becomes directional in the inside shape by a pair of roller 11. In this case, a non-squeezed part Ka is left in both end parts of the tube stock K. Subsequently, from one end opening of the tube stock K, a waveform plate 5 is inserted, and a slightly squeezed part of the tube stock K is squeezed flatly by a pair of rollers 12 to the extent that the waveform plate 5 is deformed a little. The waveform plate 5 is held down by the inside surface of the tube stock 5, and inserted and held in a state that it adheres closely to the inside surface. Next, non- squeezed part Ka of the tube stock K is crashed flatly in the direction being orthogonal to the squeezing direction by a pair of rollers 15. In such a way, the tube 2 which contains the waveform plate 5, and also, provided with a connecting port 2a is manufactured.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a heat exchanger tube having a plurality of flow paths, which is useful for heat exchangers used as condensers of various cooling devices, vehicle radiators, etc. This relates to a manufacturing method.

(Prior art) Figures 6 to 9 show conventional heat exchangers.
7 is a perspective view of a tube, FIG. 8 is an enlarged cross-sectional view taken along the line ■--■ in FIG. 7, and FIG. 9 is a cross-sectional view of a connecting portion.

The heat exchanger shown in FIG. 6 includes a pair of header pipes 21 arranged in parallel at a predetermined interval, and a tube for heat exchange medium circulation installed between the header pipes 21 with both ends connected to each other. 22, heat exchange fins 23 interposed between the tubes 22, and a pair of reinforcing members 24 attached to the heat exchange fins 22 at the upper and lowermost positions and installed between the header pipes 21. .

A plurality of connection holes 21a into which the ends of the tubes 21 can be inserted are formed on the outer peripheral surface of each header pipe 21 at predetermined intervals in the axial direction. In addition, each header pipe 21
The inside is divided by a partition plate (not shown),
Further, both end openings are sealed with lids 21b. Furthermore, the upper part of the header pipe 21 on one side (on the left side in the figure) has an inlet 21c through which a heat exchange medium such as refrigerant or brine flows.
However, in the lower part of the other header vibe 21 (on the right side in the figure), an outlet 21d through which the heat exchange medium flows out is provided.

As shown in FIGS. 7 and 8, the tube 22 is a straight pipe with a horizontally long and flat cross section, and as shown in FIG. 21H, and the part is welded by brazing or the like. Moreover, inside the tube 21, the tube 21
A corrugated plate 25 defining a plurality of flow channels therein is disposed.

Further, the upper and lower ends of wave-curved heat exchange fins 23 are welded to the flat upper and lower surfaces of each tube 22 by brazing or the like.

(Problem to be Solved by the Invention) Conventionally, when forming a tube 22 having a plurality of flow paths, a corrugated plate 25 of the same length is inserted into a tube of a predetermined length and has a flat cross section. However, since the portion of the corrugated plate 25 that comes into contact with or approaches the inner surface of the pipe material is welded by brazing or the like (for example, as disclosed in Japanese Patent Application Laid-Open No. 175588/1983)
(Refer to the publication), a corrugated plate 25 is placed inside a relatively long pipe material.
In addition, it is difficult to uniformly weld the pipe material, and if the corrugated plate 25 is not formed to match the inner shape of the pipe material, it is difficult to appropriately shape the desired mutually isolated flow paths. The problem is that it is not possible to achieve the intended purpose of forming a plurality of flow paths within the tube 22, that is, it is not possible to divide the heat exchange medium evenly and distribute it evenly within the tube 22 to improve heat exchange efficiency. There was a point. Also,
Since the corrugated plate 25 to be inserted into the tube must be shaped in advance to match the inner shape of the tube, there is a problem in that the machining of the corrugated plate 25 is troublesome.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a method for manufacturing a tube for a heat exchanger that can accurately and easily manufacture a tube having a plurality of flow paths. .

(Means for Solving the Problems) In order to achieve the above-mentioned object, in the present invention, a corrugated plate having a shorter length than the tube material is pushed inside a tube material of a predetermined length, and the tube material is inserted into both ends where the corrugated plate is not present. By crushing the tube material flatly in a direction perpendicular to the axial direction and sandwiching the corrugated plate between the inner surfaces of the pipe material, and crushing both ends of the pipe material flatly in a direction crossing the crushing direction, a connection port is formed. Manufactures tubes for heat exchangers.

(Function) According to the present invention, when a corrugated plate is inserted inside a pipe material and the pipe material is flattened in a direction perpendicular to the axial direction leaving both ends where the corrugated plate is not present, the inside of the pipe material is crushed. The inserted corrugated plate is pressed against the inner surface of the tube, and is held with its ridge portion in close contact with the inner surface.

Furthermore, when both ends of the tube where the corrugated plate does not exist are flattened in a direction intersecting the crushing direction, connection ports with a width smaller than the cross-sectional longitudinal width of the tube are formed at both ends of the tube by the crushing. be done. Also, at this time,
The axial ends of the corrugated plate are held down by the inner surfaces of both ends of the crushed tube.

(Example of Length) Figures 1 to 5 show an embodiment of the present invention. Figure 1 is a perspective view of a heat exchanger, Figure 2 is a perspective view of a tube, and Figure 3 is a perspective view of a heat exchanger. FIG. 4 is a cross-sectional view of the connecting portion, and FIG. 5 is a diagram showing the manufacturing process of the tube.

The heat exchanger shown in FIG. 1 includes a pair of header pipes 1 arranged in parallel at a predetermined interval, and a tube 2 for heat exchange medium circulation installed between the header pipes 1 with both ends connected to each other. It mainly consists of heat exchange fins 3 interposed between the tubes 2, and a pair of reinforcing members 4 attached to the heat exchange fins 2 at the upper and lowermost positions and installed between the heter vibes 1.

A plurality of connection holes 1a are formed at predetermined intervals in the axial direction on the outer peripheral surface of each hesodar pipe 1, through which the ends of the tubes 2 can be inserted. Furthermore, the inside of each header vibe 1 is partitioned by a temporary partition (not shown), and both end openings are sealed with M 1 b. Furthermore, in the upper part of the header pipe 21 on one side (on the left side in the figure), a refrigerant,
An inlet IC through which a heat exchange medium such as brine flows in is provided, and an outlet port 1d through which the heat exchange medium flows out is provided at the lower part of the other header pipe 1 (on the right side in the figure).

As shown in FIG. 2 and FIG. 3, the tube 2 has a horizontally long and flat cross section except for both ends, and a vertically long and flat cross section at both ends.

Both ends of the tube 2 are configured as connection ports 2a, and as shown in FIG. 4, the tube 2 has each connection port 2a inserted into a connection hole 1a of each header pipe 1, and these portions are welded together by brazing or the like. Further, inside the tube 1, a corrugated plate 5 is disposed which provides a plurality of flow paths within the tube 1. This corrugated plate 5 has its edge portion in close contact with the inner surface of the tube 2, and its axial end portion is pressed down by a step 2b formed at the boundary between the tube 2 and the connection port 2a. Further, the upper and lower ends of wave-curved heat exchange fins 3 are welded to the flat upper and lower surfaces of each tube 2 by brazing or the like.

Here, the manufacturing method of the tube will be explained with reference to FIG.

First, a tube material K of a predetermined length as shown in FIG. 5(a) is prepared. In this embodiment, a tube material K having a circular cross section is used.

Next, as shown in FIG. 5(b), the tube material K is slightly crushed using a pair of rollers 11 in a direction perpendicular to its axial direction and to the extent that the inner shape has directionality. Moreover, at the time of this crushing, non-crushed portions Ka are left at both ends of the tube material K.

Next, as shown in FIG. 5(C), the corrugated plate 5 is inserted through the opening at one end of the slightly crushed tube K, leaving both ends intact. The corrugated plate 5 is shorter than the tube hole K by a length corresponding to the non-squeezed portion Ka, so that the corrugated plate 5 is not located inside the non-squeezed portion Ka in the inserted state.

Next, as shown in FIG. 5(d), using a pair of rollers 12, the slightly crushed portion of the tube material K is moved in the same direction as above and on the inner surface to such an extent that the corrugated plate 5 is slightly deformed. Crush it flat. As a result, the corrugated plate 5 inserted into the tube material K is pushed out slightly in the width direction and pressed against the inner surface of the tube material K, and is held with its ridge portion in close contact with the inner surface.

Next, as shown in FIG. 5(d), the non-crushed portion Ka of the tube material K is flattened using a pair of rollers 13 in a direction perpendicular to the crushing direction. As a result, the axial ends of the corrugated plate 5 are pressed against the inner surfaces of both ends of the crushed tube material K.

With the above steps, a tube 2 having a built-in corrugated plate 5 as shown in FIG. 5(r) and having connection ports 2a at both ends is manufactured.

According to the above-described tube manufacturing method, the tube material K
By flattening it in a direction perpendicular to its axis,
Since the corrugated plate 5 inserted into the tube material K can be held in a state where its ridge portion is in close contact with the inner surface, a plurality of mutually isolated flow paths can be precisely created inside the tube 2.
Moreover, it can be easily formed.

In addition, by flattening both ends of the pipe material K where the corrugated plate 5 does not exist in a direction perpendicular to the crushing direction, the axial end of the corrugated plate 5 is held down by the inner surfaces of both ends of the crushed pipe material K. Since the corrugated plate 5 can be attached to the inside of the tube 2, the corrugated plate 5 can be securely fixed inside the tube 2 together with the above-mentioned clamping action. Moreover, by this crushing, connecting ports having a width smaller than the cross-sectional longitudinal width of the tube 2 can be formed at both ends of the tube 2, so when a heat exchanger is constructed using the tube, , a header pipe with a small inner diameter can be used as a header pipe that is not directly involved in heat exchange, thereby reducing component costs and the amount of heat exchange medium used.

In the above embodiment, both ends of the pipe material K are crushed after the corrugated plate 5 is clamped, but the corrugated plate is pushed in after crushing one end first, and then the other end is crushed. The end portions may be crushed. Furthermore, the same effect as described above can be expected if the direction of crushing of both ends of the tube material K is a direction that intersects the direction of crushing when the corrugated plate is clamped.

(Effects of the Invention) As described in detail above, according to the present invention, by flattening the pipe material in a direction perpendicular to the axial direction thereof, the corrugated plate inserted into the pipe material is Since the tube can be held in close contact with the tube, a plurality of mutually isolated channels can be precisely and easily formed inside the tube.

In addition, by flattening both ends of the pipe where the corrugated plate does not exist in a direction intersecting the crushing direction, the axial end of the corrugated plate can be pressed by the inner surfaces of both ends of the crushed pipe. Therefore, together with the above-mentioned clamping action, the corrugated plate can be reliably fixed inside the tube. Moreover, this crushing makes it possible to form connection ports at both ends of the tube with a width smaller than the cross-sectional longitudinal width of the tube. A header vibe with a small inner diameter can be used as a header vibe that is not directly involved in the process, thereby reducing component costs and the amount of heat exchange medium used.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a perspective view of a heat exchanger, FIG. 2 is a perspective view of a tube,
Figure 3 is an enlarged sectional view taken along line I-I in Figure 2, Figure 4 is a cross-sectional view of the connecting part, Figure 5 is a manufacturing process diagram of the tube, and Figures 6 to 9 are conventional heat exchangers. Fig. 6 is a perspective view of the heat exchanger, Fig. 7 is a perspective view of the tube, Fig. 8 is an enlarged sectional view taken along the line II-II of Fig. 7, and Fig. 9 is a cross-sectional view of the connection part. It is a diagram. 1... Header vipe, 2... Tube, 2a...
Connection port, 5...Corrugated plate, K...Pipe material.

Claims (1)

[Claims] In a method of manufacturing a tube for heat exchange medium distribution, which is installed between a pair of header pipes with both ends connected to each other, a corrugated plate having a shorter length than the tube material is placed inside a tube material of a predetermined length. Insert the tube, leave both ends where the corrugated plate does not exist, flatten the tube in a direction perpendicular to its axial direction, sandwich the corrugated plate with its inner surface, and crush both ends of the tube in a direction perpendicular to the crushing direction. A method of manufacturing a tube for a heat exchanger, characterized in that a connection port is formed by flattening the tube.