JPH0631333Y2 - 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 as a condenser or an evaporator in a refrigeration circuit.

[Conventional technology]

Conventionally, there is a heat exchanger shown in FIG. This is, for example, a heat exchanger used in an air conditioning refrigeration circuit of an automobile. This heat exchanger has a plurality of flat tubes 1 which are parallel to each other, and corrugated fins 3 assembled between the flat tubes 1. The flat tube 1 and the corrugated fins 3 are fixed to each other by brazing. The flat tube 1 is made by extruding aluminum. This flat tube 1
Has a plurality of refrigerant passages that are adjacent to each other in the air flow direction. At both ends of the flat pipe 1, header pipes 5 for branching in or out the refrigerant into a plurality of refrigerant passages are joined. This joining is performed by inserting the flat pipe 1 into the insertion port formed in the header pipe 5 and fixing the header pipe 5 and the flat pipe 1 by brazing.

As shown in FIG. 3, a union 9 is connected to the header pipe 5 via a connection pipe 7 by TIG welding. A pipe (not shown) for introducing or discharging the refrigerant is connected to the union 9. The connection pipe 7 is connected to the lower part of the header pipe 5, is bent at a right angle on the way, and extends along the header pipe 5.

[Problems to be solved by the device]

However, the welding of the union 9 and the connecting pipe 7 is poor in workability because the welding length becomes long. Also, Union 9
In the TIG welding of the connection pipe 7 and the connection pipe 7, it is difficult to perform complete welding due to the difference in heat capacity, and therefore the welding becomes uncertain.

Therefore, an object of the present invention is to provide a pipe connection structure for a heat exchanger, which ensures welding between a header pipe and a connection member and has improved connection strength.

[Means for Solving the Problems]

According to the present invention, a heat exchanger including a flat pipe having a plurality of refrigerant passages, a corrugated fin provided between the flat pipes, and a header pipe assembled to an end of the flat pipe is provided. A connecting member connected to the pipe, the connecting member has a block and a connecting pipe, the header pipe has an opening in the pipe wall, the block, more than half on the circumference of the header pipe It has a cutout portion for covering and a through hole having one end opened in the cutout portion, and the connection pipe is passed through the through hole of the block and the opening of the header pipe and brazed and fixed in a furnace. A pipe connection structure of a heat exchanger characterized by the above is obtained.

[Action]

According to this, the header pipe, the block, and the connection pipe are brazed well to each other.

〔Example〕

FIG. 1 shows a connection structure according to an embodiment of the heat exchanger of the present invention. In this embodiment, the same parts as those in FIGS. 2 and 3 are designated by the same reference numerals and the description thereof will be omitted.

Referring to FIG. 1, the header pipe 5 has a connecting member 11
Is installed. The header pipe 5 is made of aluminum, that is, A300 is formed on the surface of a cylinder made of A4045.
3 is added. The connection member 11 includes a block 13 made of aluminum (A7N01) and the block 1
Aluminum penetrating 3 (A1050 or A300
3) and the connection pipe 15 made from.

In the block 13, a cutout portion 17 is formed in conformity with the outer peripheral surface of the header pipe 5 so as to cover more than half of the circumference of the header pipe 5. The block 13 has a through hole 19 extending from one side surface thereof to the inner surface of the cutout portion 17.

The through hole 19 is formed to have a tapered inner diameter in a stepwise manner. The connection pipe 15 is also formed so that its diameter is tapered step by step so as to fit the through hole 19.

When assembling, the block 1 is attached to the outer peripheral surface of the header pipe 5.
The notches 17 of 5 are aligned, and the connecting pipe 15 is inserted into the through hole 19. At the same time, the tip of the connecting pipe 15,
That is, the end portion of the connection pipe 15 in front of the cutout portion 17 of the block 13 is inserted into the opening 21 in the wall of the header pipe 5.

After assembling as described above, the entire header pipe 5, connection pipe 15 and block 13 are fixed to each other by brazing in a furnace. After that, it is taken out of the furnace and the pipe of the refrigerant circuit is connected to the screw (not shown) formed on the inner surface of the connection pipe 15. Thus, the piping connection to the header pipe of the heat exchanger is completed.

[Effect of device]

As described above with reference to the embodiments, according to the pipe connection structure of the heat exchanger of the present invention, the connecting member can be attached to the hole formed at the desired position of the header pipe and fixed by brazing, so that the header pipe can be connected. The positioning with respect to the member can be easily performed, so that the assembling workability is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a pipe connection structure of a heat exchanger according to an embodiment of the present invention, FIG. 2 is a front view showing an outline of a conventional heat exchanger, and FIG. 3 is a heat exchanger of FIG. It is a front view which shows the union and connection pipe attached to the header pipe of FIG. 1; flat pipe, 3; corrugated fins, 5; header pipe, 11; connecting member, 13; block, 15; connecting pipe.

Claims (1)

[Scope of utility model registration request] 1. A heat exchanger including a flat pipe having a plurality of refrigerant passages, a corrugated fin provided between the flat pipes, and a header pipe assembled to an end of the flat pipe.
It has a connection member connected to the header pipe, the connection member has a block and a connection pipe, the header pipe has an opening in the pipe wall, the block, on the circumference of the header pipe It has a cutout portion that covers more than half and a through hole having one end opened to the cutout portion, and the connection pipe is penetrated through the through hole of the block and the opening of the header pipe and brazed in a furnace. A heat exchanger piping connection structure characterized by being firmly fixed.