JPH0631335Y2 - Piping connection structure of heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pipe connection structure of a heat exchanger used in an air conditioner for an automobile or the like.

[Prior Art] Conventionally, as a heat exchanger for an air conditioner for an automobile, there is one shown in FIG. The heat exchanger shown in FIG. 6 has a flat tube 1 cut into a predetermined length and a corrugated fin 3 joined between the flat tubes 1. The flat tube 1 is formed into a flat shape by aluminum extrusion along the air flow direction, and has a plurality of refrigerant passages adjacent to each other in the air flow direction inside. A header pipe 5 is joined to an end portion of the flat tube 1 in order to branch the refrigerant into or out of the plurality of refrigerant passages. Flat tube 1 and corrugated fin 3
The header pipe 5 and the header pipe 5 are integrally brazed in the furnace after they are combined.

By the way, as shown in FIG. 7, a union 9 is connected to the header pipe 5 through the connection pipe 7 in this heat exchanger. The union 9 is connected to a pipe (not shown) for introducing or flowing out the refrigerant. An intermediate part of the connection pipe 7 is held by a retainer 11 fixed to the header pipe 5.

[Problems to be solved by the invention] However, the connection pipe 7 is connected to the header pipe 5 by welding or brazing, and the pipe diameter is 12.7 to
Since it is about 12.8 mm thin, it has a problem of weak strength.
Therefore, in order to reinforce by the retainer 11, it is necessary to add extra parts.

Further, the connection position of the connection pipe 7 is restricted with respect to the header pipe 5, and the mounting position of the retainer 11 is also restricted. As a result, piping work or the like may be difficult.

Further, when the connecting parts are directly brazed to the header pipe, it is necessary to perform the brazing at the same time as brazing the core in the furnace. However, the Al-Mg-Zn alloy, which is often used for the above-mentioned connecting parts, has a poor brazing property and cannot be reliably brazed to seal the refrigeration circuit.

Therefore, an object of the present invention is to provide a pipe connection structure for a heat exchanger in which a connection pipe can be easily connected to a desired portion of a header pipe and the connection strength is improved.

[Means for Solving the Problem] According to the present invention, in a structure for connecting a pipe to a heat exchanger including a flat pipe formed in a flat shape and a header pipe attached to an end of the flat pipe, Interposed between the pipe and the header pipe, including a connecting component having a through hole inside, the connecting component, a block having a notch portion on one side to fit the side surface of the header pipe, Including a pipe connecting portion protruding from the other surface of the block, the through hole of the connecting component extends from the protruding end of the pipe connecting portion to the block, forms a hole on the side surface of the header pipe, and the cutout portion. Is on the side of the above header pipe,
The through hole of the connection component is fitted so as to communicate with the hole, and the block holds the header pipe, and the pipe is connected to the pipe connecting portion. A heat exchanger pipe connection structure is obtained.

[Operation] In the pipe connection structure of the heat exchanger according to the present invention, the pipe can be connected to any position depending on the position of the hole formed on the side surface of the header pipe. Further, since the block is mounted so as to sandwich the header pipe, it is possible to increase the mounting strength.

[Embodiment] FIGS. 1 and 2 show an embodiment of a pipe connection structure of a heat exchanger according to the present invention. In this embodiment, the sixth
The same parts as those in FIG. 7 and FIG. 7 are assigned the same reference numerals and explanations thereof will be omitted.

Referring to FIG. 1 and FIG. 2, a connection component 15 is provided on a part of the header pipe 5. The connection component 15 is made of, for example, an Al—Mg—Zn alloy such as A7N01, and has a cubic block 17 and a pipe connection portion 18 protruding from one side surface of the block 17. A screw 19 is formed on the outer peripheral surface of the pipe connecting portion 18.

Referring also to FIG. 3, a notch 21 having a U-shaped cross section fitted to the outer peripheral surface of the header pipe 5 is formed on the opposite side surface of the block 17. The notch 2 has a notch length of 1/2 or more of the outer peripheral length of the header pipe 5, that is, U
It has a creepage distance along the shape of a letter.

The internal pipe 22 made of a material having a good brazing property such as A3003 or A1050 is built in the connection component 15. A through hole 16 is formed in the connection component 15 by the internal pipe 22. The internal pipe 22 extends from the projecting end of the pipe connecting portion 18 to the block 17 and projects into the cutout portion 21. On the other hand, on the side surface of the header pipe 5, a hole 23 having a smaller area than the inner surface of the cutout portion 21 is formed.

At the time of assembly, the cutout portion 21 of the block 17 is fitted to the peripheral surface of the header pipe 5 so that the end portion of the inner pipe 22 is inserted into the hole 23. In addition, move block 17 to arrow 2.
Press and crimp as shown in FIGS. As a result, as shown in FIG. 4, the block 17 is mechanically attached to the header pipe 5 so as to sandwich it.

Finally, the whole is brazed in the furnace. At the time of brazing, since the notch 21 of the block 17 covers the outer peripheral length of the header pipe 5 by 1/2 or more, brazing is performed on the entire surface of the notch 21. As a result, the header pipe 5 and the internal pipe 22 communicate with each other. That is, the refrigerant passage is formed. FIG. 5 shows a state in which the connecting component 15 is attached to the header pipe 5 of the heat exchanger in this manner.

Further, a pipe (not shown) is connected to the pipe connecting portion 18 using the screw 19 on the outer peripheral surface. The piping is thus connected to the heat exchanger.

[Effects of the Invention] As described above using the embodiments, according to the present invention,
Since the connecting part is attached and brazed and fixed toward the hole formed at the desired position of the header pipe, the connection strength is improved, and reliable brazing can be easily obtained, and piping work is facilitated.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of FIG. 1, and FIG. 3 is an exploded perspective view of a connecting part and a header pipe shown in FIG. Fig. 4 shows IV- in Fig. 2.
Fig. 5 is a cross-sectional view taken along line IV, Fig. 5 is a front view of the header pipe of the heat exchanger with connecting parts attached thereto, Fig. 6 is a front view of a conventional heat exchanger, and Fig. 7 is that of Fig. 6. It is a perspective view which shows the connection pipe attached to the header pipe of a heat exchanger. 1; flat pipe, 2; corrugated fin, 5; header pipe, 7; connecting pipe, 9; union, 11; retainer,
15; Connection part, 16; Through hole, 17; Block, 1
8; pipe connection part, 21; notch part, 22; internal pipe, 2
3; hole.

Claims (1)

[Scope of utility model registration request] 1. A structure in which a pipe is connected to a heat exchanger including a flat pipe formed in a flat shape and a header pipe attached to an end of the flat pipe, and the pipe is interposed between the pipe and the header pipe. And a connecting part having a through hole therein, wherein the connecting part has a block having a notch portion on one surface to be fitted to a side surface of the header pipe, and a pipe connecting portion protruding from the other surface of the block. The through-hole of the connecting part extends from the protruding end of the pipe connecting portion to the block, forming a hole in the side surface of the header pipe, the notch on the side surface of the header pipe, the connection The through hole of the component is fitted so as to communicate with the hole, and the block holds the header pipe, and the pipe is connected to the pipe connecting portion. Piping connection structure of the exchanger.