JPS59131781A - Enclosed type motor-compressor - Google Patents

Abstract

PURPOSE:To contact tightly and secure perfectly between a fixture and a pipe by a method wherein fine grooves of axial direction are formed at the contacting part between the choked part of the fixture of iron and the inserting hole of the pipe. CONSTITUTION:The choked part 4 is provided with a tapered surface having a slant angle beta (alpha<beta) and the axial fine grooves 6 are formed at the contacting part between the fixture 8 of iron and said taper surface. According to this method, brazing material passes upon brazing work through the clearance between the pipe and fixture to contact intimately and secure the iron fixture 8 to the copper pipe 2 since the clearances are existing at the parts of the fine grooves 6 even if the copper pipe 2 and the iron fixture 8 are adhered by the thermal expansions of them. Accordingly, the connecting part is secured tightly even when bending work is effected on the copper pipe 2 or the copper pipe 2 receives an impact, therefore, the connecting part will never be damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hermetic electric compressor, and particularly to an improved structure of a pipe connection 0 in a compressor case.

Generally, in a hermetic electric compressor, a high-pressure side connecting pipe, a low-pressure side connecting pipe, a refrigerant-filled pipe, etc. are fixed to a compressor case by welding.

As shown in Fig. 8, the conventional pipe connection structure has a tapered part of a drawing part (4) formed at one end of the connecting saw vibration part (2), and a steel pipe into which the drawing part (4) is inserted. By setting the relationship between the taper β of the tapered pipe insertion hole (7) of the fixture (8) to be β, a brazing material reservoir is provided in a part of the taper of the copper vibrator (2) and the iron fixture (8). At the same time, a fixing tool 8) is fixed to the through hole (11) of the compressor case (1) by projection welding (resistance welding).

However, the iron fixture (8) is located on the outer periphery of the copper pipe (2), and the temperature rise during the bracing process (approximately 1
000°C>, the coefficient of expansion of the copper pipe (2) is larger than that of the iron fixture (8), so the fixture (8) and the copper pipe (2)
The contact area is in perfect contact, making it difficult for the brazing filler metal (9) to penetrate into the small diameter side, and the two are fixed only at a portion of the taper.
There was a risk that the strength would be insufficient during pipe bending and impact.

The present invention provides a narrow groove in the axial direction in the contact area between the iron fixture and the copper vibrator, so that even if the copper pipe and the iron fixture come into close contact due to thermal expansion, there will be a slight gap in the groove part.
During the brazing process, the brazing filler metal passes through this gap and completely fixes the fixture and the vibe.

In addition, instead of providing a narrow groove in the contact area between the copper pipe and the iron fixture, the inner surface of the fixture or the outer surface of the steel pipe is formed into a non-circular shape, such as a polygon, so that the brazing material is formed in the contact area between the two. It is also possible to secure a void for penetration.

The above-mentioned structure greatly improves the reliability of brazing and also improves the strength, which has great practical effects.

The present invention will be described below with reference to embodiments shown in the drawings. (1)
is a compressor case that houses an electric compressor body (not shown), and the side wall of the case is equipped with steel pipes (2) (2) for connecting high pressure side connection pipes, low pressure side connection pipes, refrigerant filling pipes, etc.
(2) is not connected.

A drawn portion (4) having a tapered surface (3) with an inclination angle a is formed at one end of the steel vibrator 2), and the drawn portion is formed with an inclination angle β (β). A pipe insertion hole (7) which has a tapered surface (5) and has a large number of narrow grooves (6) (6)... having a width of 0.15 mm and a depth of 0.1 mm along the axial direction on the inner surface. The drawn part (4) of the copper vibe (2) and the pipe insertion hole (7) of the iron fixture (8) come into contact with each other. The parts are fixed with brazing filler metal (9).

The drawing part (4) of the steel pipe (2) is fixed with an iron fixture (
When inserted into the pipe insertion hole 7) of 8), the tapered surface (3) of the copper vibrator (2) and the tapered surface (5) of the iron fixture (8) come into contact and the copper vibrator (2) is fixed. can be easily formed, and since the pipe (2) and the fixture (8) can be sealed, the brazing material layer can also be formed at the same time. Moreover, even if the copper vibrator (2) expands due to the temperature rise during brazing, the thin grooves (6) (6) provided on the inner surface of the iron fixture (8)...
・This ensures a gap in the contact area, allowing the brazing filler metal (9) to easily penetrate, and the contact area is firmly and tightly fixed.

Also, as shown in Figure 6, there is a thin groove (6) on the inner surface of the iron fixture (8).
Instead of providing (6)..., narrow grooves (6) (6)... may be formed along the axial direction by knurling in the drawing part (4) of the copper vibrator (2); As shown in Figure 7, the pipe insertion hole (7) of the iron fixture (8) or fi4
Instead of providing a narrow groove in the drawing part (4) of the pipe (2), it is formed into a non-circular shape, for example, a polygonal shape, so that the gap (10) (10) into which the brazing material infiltrates during the brazing process is formed in the contact area between the two. )... may be secured.

The connection order is as follows: one end of the copper pipe (2) is drawn (
After inserting the iron fixing device (8) into the outer surface of the compressor case (1) and fixing the wax bone by brazing, insert the iron fixing device (8) into the through hole (11) with a tapered surface provided in the side wall of the compressor case (1). 8) and fix the fixture (8) to the compressor case (1) by resistance welding.

As described above, the hermetic electric compressor according to the present invention has a tapered drawn portion formed at one end of the copper pipe, and a tapered pipe insertion hole formed in the iron fixture that is resistance welded to the side wall of the compressor case. A thin groove in the axial direction is formed in the contact area of the braze to ensure a gap for the brazing filler metal to enter during the bracing process, thereby maintaining the press-fit relationship between the iron fixture and the copper vibrator and at the same time preventing thermal expansion. Even when the copper pipe expands due to the expansion of the copper pipe, the flow of the brazing material is good, and the contact portion is tightly fixed by the brazing material. Therefore, even when the copper pipe is bent or subjected to impact, the connection part is firmly fixed and will not be damaged.

[Brief explanation of drawings]

1 and 2 are a side view and a plan view of a hermetic electric compressor embodying the present invention, FIG. 3 is a cross-sectional view of the main part of the pipe connection part in the second UA, and FIG. A sectional view, FIG. 5 is a sectional view of the main part of the iron fixture, FIG. 6 is a plan view of the main part of a copper pipe according to another embodiment, and FIG. 7 is another embodiment corresponding to FIG. 4. FIG. 8 is a sectional view of a main part of a conventional example corresponding to FIG. 3. 1〉...Compressor case, (2)...Copper pipe, -
4)... Drawing part, (6) (6)... Thin groove, (7
)...Pipe insertion hole, (8)...Iron fixture, (9
)...Brazing material. 531-

Claims (1)

[Scope of Claims] 1) A drawn part formed at one end of the copper pipe is inserted into a tapered pipe insertion hole of an iron fixture and fixed by brazing, and the fixture is inserted into a through hole of a compressor case. - A closed type electric motor fixed by welding, characterized in that a thin groove in the axial direction is formed in the contact area between the drawing part and the pipe insertion hole to ensure a gap through which the brazing material flows. compressor. 2) A claim characterized in that the drawn portion of the copper vibrator or the pipe insertion hole of the iron fixture is formed into a polygonal shape to ensure a gap between the two for the flow of the brazing material. The hermetic electric compressor according to item 1.