JPS5833434Y2 - Heat exchanger pipe mounting structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the pipe mounting structure of a heat exchanger.

2. Description of the Related Art Conventionally, for example, in the case of an evaporator for a vehicle air conditioner, a tank portion of the heat exchanger consisting of a heat exchange portion and a tank portion is shown in FIG.

The tank 1 of the heat exchanger has a ring-shaped joint protrusion 1a that protrudes outward at the part that joins with the refrigerant inlet/outlet lobe 2. One end of the pipe 2 is fitted into the joint protrusion 1a, and TIG welding is performed. Both sides are welded by means such as.

However, if only the joining protrusion 1a of the tank 1 and the base material of the pipe 2 are melt-joined, the pipe 2 is likely to become perforated or partially dented, resulting in leakage due to poor airtightness, a decrease in pressure resistance, and the strength of the pipe 2. Because of this, it was necessary to supply welding wire and build up the welding wire.

However, because the cross-sectional area of the adjacent pipe section that has been overlaid changes rapidly, stress concentration occurs in section A of pipe 2.
There was a drawback that cracks were likely to occur due to vibration.

Furthermore, the extension light B part of the pipe 2 is often installed close to the tank 1, and the B part gets in the way when the welding torch is automatically passed around the pipe, making it difficult to automate the welding process. there were.

In view of the above-mentioned reasons, the present invention involves bending the end of the pipe into a roughly U-shaped cross section, fitting it into a joining protrusion provided on the tank, and melting and joining the base metal itself to improve strength and automate welding. This is the purpose.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a sectional view showing the tank portion of the heat exchanger according to the present invention.

The tank 1 of the heat exchanger has a connecting protrusion 1a projecting outward around the hole to which the pipe 3 is attached.

The shape of the joining protrusion 1a depends on the cross-sectional shape of the pipe 3, and may be ring-shaped or rectangular.

Further, the joint end 3a of the pipe 3 with the tank 1 is bent to have a substantially U-shaped cross section.

The joint end 3a of this pipe 3 is connected to the joint protrusion 1 of the tank 1.
The tank 1
This is to secure the joint between the pipe 2 and the pipe 2 in an airtight manner.

It is particularly desirable that this welding be performed by rotary arc welding.

In rotor arc welding, a high voltage and high frequency are applied between a ring-shaped tip indicated by No. 4 and the welding point in an inert shielding gas such as argon gas or helium gas to generate an arc. It uses heat to melt base materials in a short time and join them together.

Since the ring-shaped tip 4 can be made into a split type and can be made small, the tip of the pipe 2 in FIG.
It is possible to set the tip even in a narrow space such as a pipe 3, and welding can be easily performed in a narrow space regardless of the shape of the pipe 3.

The pipe mounting structure of the heat exchanger according to the present invention configured as described above melts and joins the joining end 3a of the pipe 3 and the tip of the engaging protrusion 1a of the tank 1, so that the pipe 3 does not have holes or dents. As a result, product yield is good and quality is stable.

Furthermore, since the base metals themselves are fused and joined, auxiliary members (for example, welding wires) during welding are unnecessary, and material costs can be saved.

At the same time, there is no sudden change in the cross-sectional shape as in the welded part in Figure 1, and the joint part is larger than the cross-sectional area of the pipe 3 itself, and as it spreads outward, the cross-sectional area gradually increases, resulting in an ideal cross-sectional shape and vibration resistance. Equal strength is significantly improved.

Furthermore, since it is possible to perform welding work by means such as rotary arc welding, automation becomes easy, and the welding time is shortened, which improves productivity and greatly reduces running costs, which is extremely effective in practical terms. It is an idea.

In the embodiment of the present invention, an evaporator for an air conditioner has been described, but it can also be used as a heat exchanger for a heating device.

Furthermore, it is also possible to use means such as brazing instead of rotary arc welding.

[Brief explanation of drawings]

FIG. 1 is a conventional view showing a joint between a tank and a pipe, and FIG. 2 is a sectional view of the joint according to the present invention. 1: Tank, 2, 3: Pipe, 1a: Joint protrusion, 3a:
Joint end, 4: Chip.

Claims (1)

[Scope of utility model registration request] A joining projection protruding outward is provided on the pipe attachment portion of the heat exchanger tank, and the pipe end that engages with the pipe attachment portion is bent so that the cross section becomes approximately U-shaped, and the pipe end is joined as described above. A pipe mounting structure for a heat exchanger, which is fitted into a projection and the fitting portion is welded or brazed.