JPH0384290A - Brazed structure for pipe coupling - Google Patents

Abstract

PURPOSE:To perform an easy brazing work from the top part side of a conical surface by a method wherein the outer periphery of the one end of a pipe coupling is formed in the shape of a conical surface having a specified angle, and a plurality of pipe insertion holes are formed closely to each other. CONSTITUTION:The outer periphery of the one end part of a pipe coupling 1 is formed in the shape of a conical surface 2 having an angle theta of 120 - 176 deg.. A plurality of pipe insertion holes 3 are formed in the conical surface 2, except the top part of the conical surface, in a manner to be positioned closely to each other, and the end parts of a plurality of pipes 4 are engaged with respective pipe insertion holes 3. With this state, the respective engaging parts are securelybrazed from the conical surface 2 side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe joint used as a distributor or the like for supplying refrigerant to each tube of an air conditioning heat exchanger.

[Problem to be solved]

In order to supply refrigerant from one pipe to each of the plurality of tubes, a distributor may be interposed between the two. In addition, there are cases where a plurality of tubes are assembled and the refrigerant is combined into a single pipe, and a small joint is used for this purpose.

A plurality of pipe insertion holes are bored in this joint so that one end is connected to one pipe and the other end is connected to a plurality of pipes. Then, a plurality of pipes are fitted therein, and the fitting portions are brazed and fixed. However, since it is necessary to form this joint relatively compactly, when the pipes are fitted into the joint in close proximity to each other, there is a drawback that the brazing work of the fitting portions is extremely troublesome. Furthermore, due to the difficulty of the work, there is a risk that the reliability of the brazing may be impaired.

[Means for solving problems]

Therefore, in order to eliminate the above problems, the present invention adopts the following configuration.

That is, the angle θ of the outer periphery of one end of the pipe joint 1 is 120
It is formed into a conical surface 2 with an angle of 176°.

A plurality of pipe insertion holes 3 are provided in the conical surface 2 except for the top part.
are formed adjacent to each other, and the ends of the plurality of pipes 4 are fitted into the respective pipe insertion holes 3. In this state, each of the fitting portions is brazed and fixed from the conical surface 2 side.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a detailed explanatory diagram of the present invention, and FIG. 2 is a longitudinal sectional view thereof. Moreover, FIG. 3 is a schematic diagram of an air conditioning heat exchanger using this joint structure.

This joint is used as a distributor attached to the refrigerant inlet side of an air conditioning heat exchanger.

As shown in FIG. 3, the core 5 of the heat exchanger has a large number of plate-shaped fins 6 arranged in parallel with each other with small gaps, and a plurality of U-bend tubes 8 passing through them. Then, the inner surface of the U-bend tube 8 is expanded to bring each tube hole of the fin 6 into close contact with the outer surface of the U-bend tube 8. Also, instead of expanding, the fins 6 and the U-bend tube 8 may be brazed together.

Then, one end of each of the pipes 4 is fitted to one end of the plurality of U-bend tubes 8, the other end of the pipe is fitted to the joint 1, and each fitting part is brazed and fixed. An outlet side connector is then connected to the other end of the U-bend tube 8 via a pipe 9, and each connection portion is brazed and fixed in the same manner as described above. As shown in FIGS. 1 and 2, this pipe joint 1 has one end formed into a conical surface 2 having an obtuse outer peripheral surface. This conical surface 2 has an angle of 120° to 176°. In this embodiment, a plurality of pipe insertion holes 3 are bored in the conical surface 2 in close proximity to each other at equal intervals. The axis of the pipe insertion hole 3 is perpendicular to the conical surface 2.

Further, a communication hole slightly smaller than the diameter of the pipe insertion hole 3 is bored on the extension of the pipe insertion hole 3, and the respective communication holes gather into one, which connects to the hole at the other end of the pipe fitting 1. Connects with 10. Therefore, the pipe insertion hole 3 of this pipe joint 1
In this embodiment, three pipes 4 are fitted as shown in FIG. Attach waxing material. Then, the brazing filler metal flows down from the melting point A to the fitting portion of each vibrator 4, and the fitting portion is simultaneously and
Can be brazed instantly. Note that the angle θ of the conical surface 2 is limited to 120° to 176° in Mi 120.
This is because if the angle is less than 0.0°, the brazing material will rapidly flow out of the conical surface, making it difficult for it to enter the fitting portion of the pipe 4. Moreover, if the angle is 176° or more, there is a drawback that the brazing filler metal cannot spread smoothly. At this time, the short pipe section 7 shown in FIG. 3 is fitted onto the outer periphery of the hole 10 (FIG. 2) of the pipe joint 1,
The short pipe portion 7 and the pipe joint 1 can be brazed and fixed at the same time. Then, a refrigerant inflow pipe is connected to the end of the short pipe portion 7, and an outlet side pipe is connected to the connector 11. Then, a gas-liquid two-phase refrigerant is passed through the tube, and air is passed around the outer surface of the tube to perform heat exchange.

〔Effect of the invention〕

The brazed structure of this pipe joint has an outer circumference of 12 mm at one end.
Since it is formed into a conical surface with an angle of 0° to 176°, and a plurality of pipe insertion holes 3 are formed close to it, it is a compact joint, and the brazing work can be easily performed from the top side of the conical surface 2. The reliability of the brazed portion can be improved. That is, when a plurality of pipes are inserted in close proximity, it is usually extremely troublesome to braze the insertion portions, but in the present invention, the plurality of pipes 4 are inserted into the conical surface 2 except for the top part.
spreads in the radial direction, so that the brazing operation can be easily performed from the top of the conical surface 2. At this time, by heating the conical surface 2 and the fitting portion of the pipe 4 and brazing from the top of the conical surface 2, a plurality of fitting portions can be brazed at the same time.

[Brief explanation of drawings]

FIG. 1 is a detailed explanatory diagram of the present invention, and FIG. 2 is a longitudinal sectional view thereof. Moreover, FIG. 3 is a schematic diagram of an air conditioning heat exchanger using this joint structure. 1... Pipe joint 2... Conical surface 3... Pipe insertion hole 4... Pipe 5... Core
6...Fin 7...Short tube part 8.
・・U bend tube 9・Pipe 10・
...hole 11...connector

Claims (1)

[Claims] 1) The angle θ of the outer periphery of one end of the pipe joint (1) is 12
A conical surface (2) with an angle of 0° to 176° is formed, a plurality of pipe insertion holes (3) are formed adjacent to the conical surface (2) except for the top, and the ends of the plurality of pipes (4) are formed. A brazing structure for a pipe joint, characterized in that each of the fitting portions is brazed and fixed from the conical surface (2) side in a state in which the fitting portion is fitted into each of the pipe insertion holes 3. 2) According to claim 1, the axis of the pipe insertion hole (3) is perpendicular to the conical surface. 3) According to claim 1, the conical surface (2) and the fitting part are heated in the fitted state and are brazed and fixed by brazing from the top part.