JP2001182681A - Hermetic electric compressor - Google Patents

Abstract

(57) [Summary] [Problem] Due to the deformation of the support member of the compression mechanism unit and the sealed container body during expansion and contraction of the sealed container body during spot welding, the stress transmitted to the support member of the compression mechanism unit causes the compression mechanism unit Provided is a hermetic electric compressor that minimizes distortion applied to the whole. An electric motor unit (12) and a compression mechanism unit (13) having a compression chamber for compressing a refrigerant by the electric motor unit (12) are housed inside a closed container (11), and an upper bearing as a support member of the compression mechanism unit (13) is provided. 21 is the trunk 11a of the closed container 11.
The upper bearing 2 as a support member for the compression mechanism 13 while being fixedly supported on the inner wall surface by a plurality of spot welds.
1 was provided with a plurality of low-rigidity regions, and the low-rigidity regions existed between the spot weldings.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor used for an air conditioner / refrigeration conditioner or the like.

[0002]

2. Description of the Related Art In a conventional compressor of this type, an electric mechanism 2 and a compression mechanism 3 are housed inside a sealed container 1 as shown in FIGS. The body portion 1a of the closed container 1 is generally made of a steel material that is easily welded, and is rolled from a plate-shaped steel plate and welded at the joint thereof to be finished in a cylindrical shape. The closed container 1 is formed by welding the circumferences of the upper lid 1b and the lower lid 1c to both upper and lower end surfaces of the cylindrical body 1a.

[0003] A compression mechanism 3 having a compression chamber for compressing a refrigerant is accommodated in the closed container 1. The upper bearing 4 of the compression mechanism 3 is spotted on the body 1 a of the closed container 1. In order to fix by welding, the outer periphery of the body 1a of the closed container 1 is at the same height as the end face of the body 1a of the closed container 1 and is substantially an isosceles triangle or a substantially regular triangle when viewed from above. Three holes 5 are provided at an angle, and the compression mechanism 3 is inserted into the body 1a of the closed container 1 and assembled therein, and three holes 5 provided in the body 1a of the closed container 1 are provided. The welding position of the hole 5 and the upper bearing 4 of the compression mechanism 3 is aligned, and the upper bearing 4 is fixedly supported by spot welding W from outside the body 1 a of the closed casing 1. The upper bearing 4 fixed by the spot welding W is generally made of cast iron, and is provided with several oil through holes 4 a on the outer peripheral side of the upper bearing 4. A thicker rib C (hatched portion) is provided between the oil passage holes 4a, 4a so as to provide rigidity as a whole. The spot welding portion W of the upper bearing 4 is provided at a substantially central position of a thick rib C between the adjacent oil through holes 4a, that is, in a rigid region.

[0004]

However, in the above-described conventional structure, spot welding is performed on the upper bearing 4 of the compression mechanism 3 in order to fix the compression mechanism 3 to the body 1a of the sealed container 1. For this spot welding, a welding method such as arc or TIG plasma, which easily generates high heat during welding, is used. By employing this spot welding method, high heat is generated at the time of welding, causing expansion of the support member of the compression mechanism 3 and the body 1a of the closed casing 1. In addition, during cooling after welding, shrinkage occurs in a state in which the support member of the compression mechanism 3 is fixed to the body 1a of the closed vessel 1. Particularly, in the body 1a of the closed vessel 1, before the spot welding, While retaining a nearly perfect circular shape,
After the spot welding, the welding portion is pulled, and conversely, the space between the welding positions rises toward the inner surface of the body 1a of the closed casing 1. The trunk 1 of the closed container 1
The bulge of the inner wall surface a interferes with the outer diameter of the upper bearing 4 between the spot welding positions adjacent to the upper bearing 4 of the compression mechanism 3, and the stress at that time spreads over the entire compression mechanism 3 and the compression mechanism 3 In some cases, this may cause overall distortion.

The compression mechanism 3 is adjusted and assembled while maintaining the clearance between the sliding surfaces of the parts. However, as described above, the support member of the compression mechanism 3 and the body 1a of the sealed container 1 have spots. Since a stress is generated by performing the welding, the gap changes before and after the spot welding, and the gap on the sliding surface of the component may become narrow or wide. When the gap between the sliding surfaces of the components is reduced, the components may be rubbed with each other, resulting in increased wear of the sliding portion and increased noise and vibration. Conversely, if the gap between the sliding surfaces of the components is widened, the compression ratio in the compression mechanism 3 may be reduced, and the capability exceeding the rating may not be exhibited.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and the supporting mechanism of the compression mechanism during spot welding and the deformation of the closed vessel body due to the expansion and contraction of the closed vessel body support the compression mechanism. It is an object of the present invention to provide a hermetic electric compressor in which the strain exerted on the entire compression mechanism due to the stress transmitted to the members is reduced as much as possible.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a hermetic electric compressor in which a compression mechanism is housed in a hermetically sealed container. A plurality of low rigidity areas are provided on the support member of the compression mechanism while being fixedly supported on the wall surface by spot welding, and the spot welding position is located in a rigid area between the low rigidity areas. Due to this, after the spot welding, the welded portion of the body of the sealed container is pulled, and the inner surface side of the sealed container body between the adjacent welding positions rises, and even if it interferes with the outer diameter of the support member of the compression mechanism, the deformation is prevented. Since it can be absorbed in the low rigidity region, the effect of stress on the compression mechanism can be reduced, and wear, vibration, noise, and reduction in compression ratio of the sliding surface can be prevented.

[0008]

According to a first aspect of the present invention, a drive mechanism and a compression mechanism having a compression chamber for compressing a refrigerant by the drive mechanism are housed in a closed container. While the support member of the compression mechanism portion is fixedly supported by spot welding at a plurality of locations on the inner wall surface of the closed container body,
By providing a plurality of low-rigidity regions on the support member of the compression mechanism portion and configuring the low-rigidity region to exist during the spot welding, a welding portion of the closed vessel body is pulled after the spot welding and welded. Even if the inner surface side of the sealed container body between the position and the welding position rises and interferes with the outer diameter of the support member of the compression mechanism, the deformation can be absorbed in the low rigidity region, so that the entire compression mechanism is There is no distortion.

According to the second aspect of the present invention, the same operation as the first aspect can be obtained by arranging all the welding positions outside the low rigidity area.

According to a third aspect of the present invention, the support member of the compression mechanism having the low rigidity region is a support bracket formed separately or an upper bearing, a lower bearing, or a cylinder constituting the compression mechanism. And a partition plate for partitioning the cylinder. If the welding position is provided between the low-rigidity region and the low-rigidity region, the same operation as in claim 1 can be obtained regardless of the support member.

Further, according to the invention of claim 4, the low rigidity area is constituted by a through hole vertically penetrating, and the welding position is provided between the low rigidity area and the low rigidity area. Thereby, an operation equivalent to that of the first aspect is obtained.

Further, the invention according to claim 5 is characterized in that, regardless of which support member is used, the low rigidity region is constituted by a thin portion and the welding position is provided between the low rigidity regions. The effect equivalent to 1 is obtained.

Further, according to the present invention, no matter which supporting member is used, a material having low rigidity is inserted into the opening of the low rigidity region to form a welding position between the low rigidity region and the low rigidity region. By providing it between them, an operation equivalent to that of claim 1 can be obtained.

Further, according to the invention of claim 7, the transmission force applied to the spot welding position and the thermal deformation at the time of spot welding are balanced by arranging the low-rigidity regions in any of the support members substantially uniformly in the circumferential direction. Therefore, an operation equivalent to that of the first aspect is obtained.

Hereinafter, the present invention will be described in detail with reference to the drawings. 1 to 3 show a rolling piston type hermetic compressor according to Embodiment 1 of the present invention. An electric motor unit 12 and a compression mechanism unit 13 are provided inside the closed container 11. The motor unit 12 is a closed container 11
A stator 14 fixed to the inner wall surface of the body 11a,
Rotor 1 fixed to shaft 15 of compression mechanism 13
6, the rotation power is applied to the shaft 15 of the compression mechanism 13 via the rotor 16 by passing the current through the stator 14.

The compression mechanism 13 is provided with an eccentric portion 15a at a portion corresponding to the cylinder 17 of the shaft 15. A piston 18 disposed in a cylinder 17 is fitted into the eccentric portion 15a, and the eccentric portion 15a of the shaft 15 is fitted.
An eccentric rotation can be obtained by the rotation of a. Also,
A vane 20 is provided which constantly contacts the outer peripheral surface of the piston 18 by a biasing means such as a spring 19. The shaft 15 is rotatably supported at both ends by an upper bearing 21 and a lower bearing 22. The upper bearing 21 and the lower bearing 22 sandwich the cylinder 17 so as to maintain a clearance between the sliding surfaces of the respective components and adjust the assembly. The compression mechanism 13 is formed by tightening the upper bearing 21 and the lower bearing 22 with mounting bolts 23 while performing.

As shown in FIG. 3, the position W of spot welding of the upper bearing 21 as a support member for fixing the compression mechanism 13 to the inner wall surface of the body 11a of the closed container 11 is as follows.
There are three places in the circumferential direction, and the position is
Between the low rigidity area A and the low rigidity area A. The low-rigidity area A includes an oil through hole 21 which is a through hole of the upper bearing 21.
It is formed by providing three a at equal intervals along the circumferential direction. The position W of the spot welding is desirably located between the low-rigidity area A and the low-rigidity area A. It does not have to be on the center line of the region. Further, the low-rigidity area A and the rigidity area B do not necessarily have to be at equal intervals.

The supporting member for performing the spot welding is not limited to the upper bearing 21. As in the second embodiment shown in FIGS. 4 and 5, a bracket 24 is fastened and fixed to the upper bearing 21 with mounting bolts 23. Bracket 24
Is extended to the inner wall surface of the body 11a of the closed container 11, and the extended portion is spot-welded to the body 11a of the closed container 11 to fix and support the compression mechanism 13, while the position W of the spot welding of the bracket 24 is set to the bracket. Low rigidity area A and low rigidity area A formed by 24 oil passage holes 24a
May be provided in between.

The third embodiment shown in FIGS.
, The outer periphery of the cylinder 17 is extended to the inner wall surface of the body 11a of the closed container 11, and the extended portion is connected to the closed container 1
The spot welding position W of the cylinder 17 is fixed while the compression mechanism 13 is fixedly supported by spot welding to the body 11a of the first cylinder.
May be provided between the low rigidity areas A formed by the oil passage holes 17a provided in the cylinder 17.

The fourth embodiment shown in FIGS.
The outer periphery of the lower bearing 22 is
1a to the inner wall surface,
And the compression mechanism 13 is fixedly supported by the body 11a, and the position W of the spot welding of the lower bearing 22 is set to the low rigidity area A and the low rigidity area formed by the oil through hole 22a provided in the lower bearing 22. A may be provided between the two.

Further, as in the fifth embodiment shown in FIGS. 10 and 11, a partition plate having two compression mechanism sections 13 and partitioning the compression section between the first cylinder 17b and the second cylinder 17c. 25 is extended to the inner wall surface of the body 11a of the sealed container 11, and the extended portion is spot-welded to the body 11a of the sealed container 11 to fix and support the compression mechanism 13, while the spot W of the partition plate 25 is spot-welded. May be provided between the low rigidity areas A formed by the oil passage holes 25 a provided in the partition plate 25.

The sixth embodiment shown in FIGS. 12 and 13 is different from the first embodiment in that an oil through hole 21a serving as a through hole in the upper bearing 21 as a support member of the compression mechanism 13 is formed in the circumferential direction. Are provided at equal intervals along the line, and the center extends over three adjacent oil passage holes 21a at equal intervals among the six rigid regions existing between the adjacent oil passage holes 21a. A thin portion (indicated by a hatched portion in FIG. 13) 26 is provided, and the low-rigidity region A is formed by the thin portion 26. The position W of the spot welding is determined by the remaining three oil through holes 21a, 21a other than the formation of the thin portion 26.
Although it is desirable to provide them between them, the position W of the spot welding does not have to be on the center line at the three places between the remaining three oil through holes 21a, except for the thin portion 26 being formed. The remaining three rigid regions other than the thin portion 26 between the oil passage holes 21a and 21a are not necessarily equally spaced.

The supporting member for performing the spot welding is not limited to the upper bearing 21. As in a seventh embodiment shown in FIGS. 14 and 15 as a modified example of the second embodiment, a bracket 24 is attached to the upper bearing 21. Is fastened and fixed with mounting bolts 23, and the bracket 24 is attached to the closed container 11
To the inner wall surface of the body 11a, and the extension is spot-welded to the body 11a of
And the spot welding position W of the bracket 24 is straddled over three adjacent oil through holes 24a, 24a at equal intervals among six adjacent oil through holes 24a, 24a of the bracket 24. The remaining three oil passage holes 24a other than the thin portion 27 formed by
It may be provided between 24a.

In the eighth embodiment shown in FIGS. 16 and 17, instead of the third embodiment, the outer circumference of the cylinder 17 is extended to the inner wall surface of the body 11a of the closed vessel 11,
The extension is spot-welded to the body 11a of the sealed container 11 to fix and support the compression mechanism 13, while the cylinder 17
Of the spot welding position W of the cylinder 17 between the six adjacent oil through holes 17a, 17a, except for the thin wall portion 28 formed over the three adjacent oil through holes 17a at equal intervals. May be provided between the remaining three oil passage holes 17a, 17a.

In the ninth embodiment shown in FIGS. 18 and 19, the outer periphery of the lower bearing 22 is extended to the inner wall surface of the body 11a of the closed casing 11, instead of the fourth embodiment. While the compression mechanism 13 is fixedly supported by spot welding to the body 11a of the sealed container 11, the position W of the spot welding of the lower bearing 22 is adjusted between six adjacent oil through holes 22a, 22a of the lower bearing 22, It may be provided between the remaining three oil passage holes 22a, 22a other than the thin portion 29 formed over the oil passage holes 22a, 22a adjacent to three places at equal intervals.

The tenth embodiment shown in FIGS. 20 and 21 has two compression mechanism sections 13 instead of the fifth embodiment, and is provided between the first cylinder 17b and the second cylinder 17c. The partition plate 25 for partitioning the compression unit is extended to the inner wall surface of the body 11a of the closed container 11, and the extended portion is spot-welded to the body 11a of the closed container 11 to fix and support the compression mechanism unit 13, while the partition plate 25 is fixed. Of the spot welding position W of the thin portion 30 formed over three adjacent oil through holes 25a, 25a at equal intervals among six adjacent oil through holes 25a, 25a of the partition plate 25. The remaining three oil through holes 25 other than
a, 25a.

In the eleventh embodiment shown in FIGS. 22 and 23, an opening 31 is provided in the upper bearing 21 in place of the first and sixth embodiments.
A low-rigidity area A is formed by inserting a member 32 made of a material such as a low-rigidity synthetic resin and having an oil passage hole 32a formed therein. The low rigidity area A is 3
The position W of the spot welding is located in the low rigidity area A.
And the low-rigidity region A, it is desirable that the position W of the spot welding is not on the center line between the low-rigidity region A and the low-rigidity region A. Further, the low-rigidity areas A do not necessarily have to be at equal intervals.

The supporting member for performing the spot welding is not limited to the upper bearing 21. For example, similarly to the second and seventh embodiments, the upper bearing is used as in the eleventh embodiment shown in FIGS. A bracket 24 is fastened and fixed to the inner casing 21 by bolts 23, the bracket 24 is extended to the inner wall surface of the body 11 a of the closed container 11, and the extended portion is spot-welded to the body 11 a of the closed container 11 to perform the compression mechanism 13. While the position W of the spot welding is fixed, an opening 33 is provided in the bracket 24, and a member 34 made of a material such as a synthetic resin having low rigidity and having an oil through hole 34a formed therein is inserted into the opening 33. It may be provided between the formed low rigidity areas A.

As in the third and eighth embodiments, the outer periphery of the cylinder 17 is wrapped around the body 11 of the closed container 11 as in the twelfth embodiment shown in FIGS.
a, and the extension is spot-welded to the body 11a of the sealed container 11 to fix and support the compression mechanism 13, while the position W of the spot welding is provided in the cylinder 17 with an opening 35, The portion 35 may be provided between the low-rigidity regions A formed by inserting a member 36 made of a material such as a low-rigidity synthetic resin and having an oil through hole 36a.

As in Embodiments 4 and 9, as in Embodiment 13 shown in FIGS. 28 and 29, the outer periphery of the lower
And the extension portion is spot-welded to the body 11a of the sealed container 11 to fix and support the compression mechanism 13, while the position W of the spot welding is provided in the lower bearing 22 with an opening 37, The member 3 made of a material such as a synthetic resin having low rigidity in the portion 37 and having an oil passage hole 38a formed therein
8 may be provided between the low-rigidity areas A formed by inserting the low-rigidity areas 8.

Further, the first embodiment shown in FIGS. 30 and 31 as in the fifth and tenth embodiments.
As shown in FIG. 4, a partition plate 25 that has two compression mechanism units 13 and partitions a compression unit between the first cylinder 17b and the second cylinder 17c is extended to the inner wall surface of the body 11a of the closed container 11, Its extension is the trunk 11 of the closed container 11.
a, while the compression mechanism 13 is fixed and supported, the position W of the spot welding is set in the partition plate 25 by the opening 39.
Is provided between the low-rigidity area A and the low-rigidity area A formed by inserting a member 40 made of a material such as a synthetic resin having low rigidity and having an oil through hole 40a formed therein. May be.

[0032]

As described above, the support member of the compression mechanism incorporated in the closed container as in the first aspect of the invention is fixedly supported on the inner wall surface of the closed container body by spot welding. A plurality of low-rigidity areas are provided on the support member of the compression mechanism, and a spot welding position is located between the low-rigidity area and the low-rigidity area so that the low-rigidity area exists between the spot weldings. Due to the configuration, the welded portion of the closed container body is pulled after spot welding, and the inner surface side of the closed container body between the welding position and the welding position swells,
Even if it interferes with the outer diameter of the support member of the compression mechanism, the deformation can be absorbed in the low rigidity region, so that the strain applied to the entire compression mechanism can be reduced. Further, by arranging all the welding positions in places other than the low-rigidity region as in the second aspect of the invention, the same effect as described above can be obtained.
Further, a support bracket in which a support member of the compression mechanism for performing spot welding as in the invention according to claim 3 is formed separately, or an upper bearing constituting the compression mechanism, or
If the welding position is provided between the low-rigidity region and the low-rigidity region as the lower bearing or the partition plate that separates the cylinders, the same operation as that of claim 1 can be obtained regardless of the support member. As a result, the compression mechanism is assembled while maintaining the clearance between the sliding surfaces of the components. However, by providing the above-described structure, the stress of the sealed container body generated at the time of spot welding is reduced. Can be absorbed in the low-rigidity region, so that it can be configured as a finished product without changing the gap of the sliding surface, so that the parts rub against each other, the sliding parts wear and noise, vibration,
In addition, an improvement in compression ratio is expected, and an optimum and best compressor can be provided.

Further, the low rigidity region is defined by claims 4, 5,
The same effects as described above can be obtained by forming the structure according to claim 1 or claim 2 or claim 3 and forming the structure according to claim 6. Furthermore, by disposing the low-rigidity regions substantially uniformly in the circumferential direction as in the invention according to claim 7, the transmission force applied to the spot welding position and the thermal deformation at the time of spot welding are balanced. The same effect as in the item 1 is obtained.

The present invention does not require any special parts except for the invention described in claim 6 and requires only simple additional processing on the support member compared to the present situation. In this case, since only an inexpensive material is fixed to the support member, a highly reliable compressor can be provided without being affected by the price.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hermetic electric compressor according to Embodiment 1 of the present invention.

FIG. 2 is a longitudinal sectional view of the hermetic electric compressor at another position.

FIG. 3 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 4 is a longitudinal sectional view of a hermetic electric compressor according to Embodiment 2 of the present invention.

FIG. 5 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 6 is a longitudinal sectional view of a hermetic electric compressor according to Embodiment 3 of the present invention.

FIG. 7 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 8 is a longitudinal sectional view of a hermetic electric compressor according to Embodiment 4 of the present invention.

FIG. 9 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 10 is a longitudinal sectional view of a hermetic electric compressor according to Embodiment 5 of the present invention.

FIG. 11 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 12 is a longitudinal sectional view of a hermetic electric compressor according to Embodiment 6 of the present invention.

FIG. 13 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 14 is a longitudinal sectional view of a hermetic electric compressor according to Embodiment 7 of the present invention.

FIG. 15 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 16 is a longitudinal sectional view of a hermetic electric compressor according to an eighth embodiment of the present invention.

FIG. 17 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 18 is a longitudinal sectional view of a hermetic electric compressor according to a ninth embodiment of the present invention.

FIG. 19 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 20 is a longitudinal sectional view of a hermetic electric compressor according to Embodiment 10 of the present invention.

FIG. 21 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 22 is a longitudinal sectional view of a hermetic electric compressor according to an eleventh embodiment of the present invention.

FIG. 23 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 24 is a longitudinal sectional view of a hermetic electric compressor according to a twelfth embodiment of the present invention.

FIG. 25 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 26 is a longitudinal sectional view of a hermetic electric compressor according to Embodiment 13 of the present invention.

FIG. 27 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 28 is a longitudinal sectional view of a hermetic electric compressor according to Embodiment 14 of the present invention.

FIG. 29 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 30 is a longitudinal sectional view of a hermetic electric compressor according to Embodiment 15 of the present invention.

FIG. 31 is a cross-sectional view of a main part of the hermetic electric compressor.

FIG. 32 is a longitudinal sectional view of a conventional hermetic electric compressor.

FIG. 33 is a cross-sectional view of a main part of the hermetic electric compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Closed container 11a Body 12 Motor part 13 Compression mechanism part 14 Stator 15 Shaft 15a Eccentric part 16 Rotor 17 Cylinder 17a Oil passage hole 17b 1st cylinder 17c 2nd cylinder 18 Piston 19 Spring 20 Vane 21 Upper bearing 21a Oil passage Hole 22 Lower bearing 22a Oil through hole 23 Mounting bolt 24 Bracket 24a Oil through hole 25 Partition plate 25a Oil through hole 26, 27, 28, 29, 30 Thin portion 31, 33, 35, 37, 39 Opening 32, 34, 36, 38, 40 member 32a, 34a, 36a, 38a, 40a Oil through hole A Low rigidity area B Rigidity area W Spot welding position

Claims (7)

[Claims] A drive mechanism and a compression mechanism provided with a compression chamber for compressing a refrigerant by the drive mechanism are housed inside the closed container, and a support member of the compression mechanism is mounted on an inner wall surface of the closed container body. While being fixedly supported by multiple spot welding
A hermetic electric compressor, wherein a plurality of low-rigidity regions are provided on a support member of the compression mechanism section so that the low-rigidity regions exist between the spot weldings. 2. The hermetic electric compressor according to claim 1, wherein all welding positions are located outside a low rigidity area. The support member of the compression mechanism having the low-rigidity region is a support bracket formed separately, an upper bearing or a lower bearing constituting the compression mechanism, or a partition plate that separates a cylinder from a cylinder. The hermetic electric compressor according to claim 1 or 2, wherein: 4. The hermetic electric compressor according to claim 1, wherein the low-rigidity region is a through hole vertically penetrated. 5. The hermetic electric compressor according to claim 1, wherein the low rigidity region is a thin portion. 6. The hermetic electric compressor according to claim 1, wherein the low-rigidity region is formed by inserting a low-rigidity material into the opening. 7. The low-rigidity region is arranged substantially uniformly in a circumferential direction.
Or a hermetic electric compressor according to 5 or 6.