JPH03189387A - Closed case for closed type compressor - Google Patents

Abstract

PURPOSE:To provide a compressor which reduces the generation of noise by forming the closed case of a closed type compressor with at least two steel sheets processed in a given shape and a resilient material, e.g. synthetic resin, a high molecular material, located between the steel sheets except joint parts, e.g. parts welded to a closed case or the weld part of the case. CONSTITUTION:A resilient material 11, formed of synthetic resin or a high molecular material, being abundant in elasticity and adhesion is mounted to the one surface of the one steel sheet 2a of steel sheets 2a and 2b formed in a plateform shape, except joint parts 12-18 of parts welded to the steel sheets 2a and 2b in a following process. The steel sheets 2a and 2b are joined together such that the resilient material 11 is sandwiched by the other steel sheet 2b in cooperation with the one steel sheet. Thereafter, the steel sheets 2 and 2b between which the resilient material 11 is located are formed in a roll, a seam therebetween is seam-welded to a cylinder body 2. Cover bodies are seam-welded to the upper and lower openings of the cylinder body 2 to form a closed case. Thus, since the resilient material 11 is not located at the joint parts 12-18, the resilient material 11 is prevented from deterioration during welding.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a hermetic case for a hermetic compressor used in refrigerators and the like.

(b) Conventional technology Conventionally, hermetic compressors used in refrigerators, etc.
As disclosed in Publication No. 8-150092, etc., -
A sealed case is formed by a cylindrical body made of roll-formed steel plates and seam welded at their joints, and a lid body arc welded to the cylindrical body to close the opening of the cylindrical body. The main body of the compressor was housed in the

(c) Problems to be Solved by the Invention In general, hermetic compressors for refrigerants used in refrigerators, etc., due to their characteristics, suffer from operational vibrations, resonance between the compressor body and the hermetic case, and even vibrations within the hermetic case. It is inevitable that noise will occur, and various noise countermeasures have been taken so far, but no good solution has been found.

On the other hand, recently, in order to reduce the vibrations of equipment, various companies have developed so-called vibration-damping steel plates in which a synthetic resin material is sandwiched between a pair of steel plates.

Therefore, the use of the above-mentioned vibration-damping steel plates in the components of hermetic compressors is being considered, but when trying to apply vibration-damping steel plates to the conventional closed case structure described above, the following problems arise. be.

In other words, when welding parts such as seam welding of joints and welding of parts to be welded to the sealed case, such as suction and discharge pipes and airtight terminals for power supply, the temperature of the welded part becomes extremely high, so the temperature between the steel plates at and around the welded part becomes extremely high. There was a problem in that the resin and polymeric materials deteriorated, the damping effect of the damping steel plate body was impaired, and the desired noise reduction effect could not be obtained. Also,
The reasons include that the welding work is performed from the outside of the sealed case, that the elastic body deteriorates or melts at the welded part as mentioned above, and that the steel plates that make up the damping steel plate are thin and thin. Therefore, a high degree of skill and skill is required to ensure that the welded parts are in close contact, and there is a problem in that welding workability is poor.

The present invention has been made in view of these points, and allows the steel plate to be used in a closed case without impairing the vibration damping effect as a vibration damping steel plate, and also improves the airtightness and welding work at the welded parts of the case. The purpose of the present invention is to obtain a sealed case that can improve performance and provide a low-noise compressor.

(d) Means for Solving the Problems The present invention provides a hermetic case for a hermetic compressor that houses a compressor main body therein, with at least two steel plates processed into a predetermined shape, and a vibrator, a terminal, etc. It is made of parts welded to the case or an elastic material such as synthetic resin or polymer material interposed between the steel plates except for the welded parts and other joint parts of the case.

(e) Function The hermetic case of the hermetic compressor of the present invention has the above-described structure, and elastic bodies are interposed in advance at the welds of parts such as suction and discharge vibrators and airtight power supply terminals to be welded to the hermetic case. Therefore, even if the temperature of the welded part becomes extremely high during welding, the resin or polymer material between the steel plates in and around the welded part will not melt or deteriorate, and welding can be performed only between the metals. This improves airtightness and welding workability. This makes it possible to actually use a vibration-damping steel plate in the sealed case, thereby reducing the noise of the compressor.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a sealed case formed of a cylindrical body 2 and lids 3 and 4 arc welded to the cylindrical body so as to close the upper and lower openings of the cylindrical body. Reference numeral 5 designates a hermetic rotary compressor constructed by housing a compressor main body 8 consisting of a rotary compressor section 6 and an electric motor section 7 for driving the compressor section 6 in the hermetic case 1.

The stator core 9 of the electric motor section 7 is shrink-fitted to the cylindrical body 2 so that a part of its outer peripheral surface is in close contact with the inner wall of the cylindrical body 2, and is fixed at a predetermined position. In addition, the rotary compressor section 6
The cylinder block LO constituting the cylinder body 2 is spot welded from the outside of the cylindrical body 2 and fixed in a predetermined position.

The cylindrical body 2 is made of two steel plates 2a and 2b which are cut into a predetermined shape and then roll-formed, and a polymer material with high viscoelasticity and adhesive properties is interposed between the steel plates. It consists of an elastic body 11.

This manufacturing method of the sealed case I is performed by attaching parts to one side of one of the steel plates 2a and 2b cut into a flat plate shape, excluding the joint portion of the parts to be welded to the steel plates 2a and 2b in a later process. Then, an elastic body 11 made of a synthetic resin or polymeric material with high viscoelasticity and adhesive properties is attached. Then, both steel plates 2a2b are joined so that the elastic body 11 is sandwiched between the other steel plate 2b. Thereafter, the cylindrical body 2 is formed by roll forming the steel plates 2a and 2b with the elastic body 11 interposed therebetween and seam welding the joint. Then, the lids 3 and 4 are seam-welded to the upper and lower openings of the cylindrical body 2, thereby forming the sealed case l. Here, the joint parts of the parts to be welded to the steel plates 2a and 2b in a later process include the welded part 12 of the suction pipe, the welded part 13 of the discharge vibrator, the welded part 14 of the refrigerant charge vibrator, and the welded part 14 of the power supply airtight terminal. Welding part 1
5 cylinder block 1o tack welding part 16, joint part 1
7 and the welded portion 18 of the lids 3 and 4, and these joint portions are secured to be thicker than the actual joint area. In addition, among the joint parts, the welded part 12 of the suction pipe
, the welded portion 13 of the discharge vibrator, the welded portion 14 of the refrigerant charge vibrator, and the welded portion 15 of the power supply airtight terminal are provided with a steel plate 2a,
After the elastic body 1 is sandwiched between the elastic body 2b, a hole of a predetermined size is made. Here, welding workability can be further improved by subjecting the joint portion to a pressing process (pressure process) to bring both steel plates 2a2b into close contact with each other before roll forming. In this case, the positioning of the elastic body 11 can be easily performed by subjecting only one steel plate to a flattening process to a thickness approximately equal to that of the elastic body 11.

The hermetic case 1 of the hermetic compressor configured in this way is as follows:
Joint parts 12, 13, 14, 15 of parts to be welded to the sealed case l, such as suction and discharge pipes and airtight terminals for power supply
, 16, 17, and 18 are not preliminarily interposed with the elastic body 11, so even if the temperature of the welded part becomes extremely high during welding, the gauge fat and polymer between the steel plates 2a and 2b in and around the welded part will be removed. The materials do not melt or deteriorate, and by performing welding only between metals, airtightness and welding workability can be improved. This makes it actually possible to use a so-called vibration damping steel plate for the sealed case 1, suppressing the propagation of internal vibrations to the outside of the sealed case 1, and reducing the noise of the compressor.

Further, the joint portion where the elastic body 11 is not interposed is
Since the rigidity is improved by welding each part, vibration propagation and resonance from this part will not be a problem.

(G) Effects of the Invention As described above, according to the present invention, since no elastic body is interposed in advance in the welding portions of parts such as suction and discharge pipes and airtight terminals for power supply to be welded to the sealed case, the welding Even if the temperature of the welded part sometimes reaches extremely high temperatures, the resin and polymer materials between the steel plates in and around the welded part will not melt or deteriorate, and by performing welding only between the metals, an airtight Improves performance and welding workability. This makes it possible to actually use a vibration-damping steel plate in the sealed case, thereby reducing the noise of the compressor.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a hermetic rotary compressor, and FIGS. 2 and 3 are explanatory diagrams showing a method of manufacturing a cylindrical body constituting a hermetic case. l... sealed case, 2... cylindrical body, 2a, 2b...
- Steel plate, 11 elastic body, 12, 13, 14, 15, 16.
17.18...Joint part. Figure 1

Claims (1)

[Claims] (1) An airtight case for a hermetic compressor that houses the compressor body inside, comprising at least two steel plates processed into a predetermined shape, and parts such as pipes and terminals that are welded to the airtight case; 1. A sealed case for a hermetic compressor, characterized in that the case is made of an elastic body such as a synthetic resin or a polymeric material interposed between the steel plates, except for joints such as welded parts of the case.