JPS5844291A - Closed type rotary compressor - Google Patents

Abstract

PURPOSE:To permit smooth operation of a valve by shutting out the heat by means of a groove formed on the inside-diameter side in the vicinity of the welded part of a cylinder and eliminating the compression phenomenon generated by the thermal stress in the valve part which is a contracted part of the cylinder. CONSTITUTION:A circumferential groove 12 is formed on the inside-diameter side in the vicinity of the arc-sport welding 5 on a cylinder 11, namely, at the inside-diameter position departed by a distance A from a vessel. Therefore, when the cylinder 11 is welded and fixed onto the vessel body 3, the vessel body 3 and the cylinder part 11 between the circumferential groove 12 and the vessel body 3 are fused and welded at plural positions through arc-spot welding 5. Then, the fusion heat is rapidly transmitted to the outside air through the surface of the circumferential groove 12, since the thermal conduction to the center of the cylinder 11 is obstructed by presence of the circumferential groove 12. Therefore, the amount of deviation in the temperature distribution in the valve part 8 forming the contracted part on the inside-diameter side of the cylinder 11 can be reduced to the minimum. Thus, the valve 8 can be operated smoothly, and the deterioration of the function of the compressor can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Misfires relate to sealed 11ill & pressure 1 machines, especially compression I
Regarding the cylinder shape of I element.

A conventional hermetic compressor is shown in FIGS. 1 and 2. In other words, electric! ! The element 1 and the pressure S*volume 2 are shrink-fitted to the container body 3, respectively, and the pressure sil! Of the bulk 2, the cylinder 4, which vibrates strongly, is fixed to the container body 3 with an arc drip aS ◎This pressure Jllll! Details of element 2 are in 2nd rl
As shown in J, the piston 1, which is fixed to the cylinder 4 circularly fixed to the container body 3, is moved by a cam rotation with the crankshaft 6 eccentric, and this movement opens and closes the valve 8 at the appropriate time to compress and discharge the liquid. However, in the above-mentioned conventional sealed j1 rotary pressure machine, when the cylinder 4 is fixed to the container body 3 by arc dripping 1a5, the cylinder 4 is affected by welding heat every 8 tL of the container body and suffers residual thermal strain. The present invention has been developed in view of the above points. A groove is formed on the inner diameter side near the bath contact point of the cylinder to provide thermal breakage.
An embodiment of the present invention which solves the above-mentioned conventional problems will now be described with reference to FIGS. In the figure, the same elements as those in the conventional example are given the same reference numerals, and the explanation @ is omitted. 011 is l! In a cylinder that is fixed to the container body 3 by arc spot welding 5 at multiple locations among the pressure jlI elements 2 fitted in the container body 3, the inner diameter side near the arc spot welding 5, that is, the inner diameter position away from the container body 3 by a distance A. A circumferential groove 12 is formed in.

In the hermetic rotary compressor having such a configuration, when the cylinder 11 is welded and fixed to the container body 3, the portion of the cylinder 11 between the circumferential groove 12 and the container body 3 and the container body 3 are welded at a point. 5, the welding heat can be absorbed by the circumferential groove 12 to minimize the amount of deviation in the temperature distribution on the inner diameter side of the cylinder 11, especially in the narrow part of the valve 8s, thereby reducing residual thermal strain. can be suppressed to the point where it can be ignored. Thereby, the valve 8 can be operated smoothly, so that the function as a compressor is not impaired.

In addition, the welding area is reduced to width A so that the mass balance of the welded part in arc spot welding becomes an approximate value of its relative specific heat, so the welding current related to nugget generation can be set downward, and the welding Reduction of heat 1-.

As a result, the above effects can be further improved.

In this embodiment, the circumferential groove 12 is formed on the inner diameter side of the cylinder 11 near the welding location, but it is clear that discrete grooves may be used.

6 and 7 show a second embodiment of the present invention, which differs from the first embodiment in that the present invention is applied to a cylinder 21 in which it is difficult to form a circumferential groove. A through hole 22 is formed on the inner diameter side of the cylinder 21 near the arc spot welding 5, that is, at a circular diameter position a distance m away from the container body 3. This embodiment has the same effect as the first embodiment, and also has the advantage of excellent machinability of the through hole 22. As described above, according to the present invention, the compression element of the hermetic rotary compressor In the case where the cylinder is fixed to the container body by arc spot welding, an S compressor is formed in the cylinder part near the inner diameter side of the welding point to prevent welding heat from being conducted toward the center of the cylinder. In addition, since the welding current can be set at a lower value, the residual stress at the center of the cylinder, especially at the valve part, which occurs during welding, can be slightly reduced, which improves the smooth operation of the valve and its function as a compressor. loss)
0 that can prevent

[Brief explanation of the drawing]

Fig. 1 is a longitudinal section of a conventional hermetic rotary compressor, the second is a partially sectional plan view of a compression element of the same compressor, and Fig. 3 is a hermetic rotary compressor which is an embodiment of the present invention. Longitudinal sectional view of, No. 4
The figure is a partial cross-sectional plan view of the pressure fi1 element of the same pressure m machine, the fifth
The figure is a half sectional view of the same compression element as above, 1g6- is a partially sectional plan view of the pressure # element which is another embodiment, and ts7 is a half sectional view of the same compression element as above.0 1... Electric, j! Element 2... Compression element 3...
・Container body 5...Arc spot welding 11.21-
... Cylinder 12 - ... Circumferential groove 22 ... Purchase hole agent Shin Kuzuno - (1 idiot) 1.1 Figure 2 Figure 37 Figure 4 Figure 6 Figure 7 Procedural amendment document Patent Office Director-General 11, Indication of the incident Tokkun Sho ■-84゜744 '2, Name of the invention l! F Closing - Rolling - 3, Person making the amendment 6, Contents of the amendment (1) Specification II, page 2, line taa, ``Solid piston 4
Correct it to a certain t "connected piston". Body) Specification @ 2 Tei $ 1! Correct the word ``liquid'' in line 4 K to ``refrigerant gas.''口）In the detailed IF, line 21, line 14, enter ``bath contact'' t ``1I
I-contact'k correction. (Amend 4 drawings gx, 3.5 and 7 as shown in the attached sheet. 7. At least one amended drawing of the catalog of attached urns.

Claims (1)

[Scope of Claims] (l) #11 is formed on the 6Qin side near the SaW location of the cylinder in the 4th interval W @fEIIA- in which the cylinder of the pressure *element is fixed to the container body by *folds. 4
Closed water fighting system compression with 1 mold - 9 (2) Is the groove 4f4? - A sealed l1l-rolling machine according to claim 1. (3) The hermetic rotary compressor according to claim 1, wherein the thread is a through hole.