JP2008190467A - Hermetic electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic electric compressor capable of applying to large capacity inverter machine while improving joint strength of a compression mechanism to a hermetic housing. <P>SOLUTION: In the hermetic electric compressor 1 provided with a cylindrical shape steel plate hermetic housing 2 and a compression mechanism 7 including a cast iron structure component 6, and having the compression mechanism 7 joined and fixed inside of the hermetic housing 2 by a plurality of welding parts via the cast iron structure component 6, a steel welding structure 31 is fixed on an outer circumference section at least corresponding to the plurality of welding parts of the cast iron structure component 6, and the welding structure 31 and the hermetic housing 1 are joined and fixed by a plurality of welding parts 32. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hermetic electric compressor that is configured by integrally incorporating a compression mechanism and an electric motor in a hermetic housing.

  In a hermetic type electric compressor that is configured by integrally incorporating a compression mechanism and an electric motor in a hermetic housing, it is necessary to install the compression mechanism and the electric motor in a cylindrical hermetic sealed housing made of steel plate. is there. The compression mechanism generally includes a bearing member, a frame member, a cylinder member, or the like as a structural component for constituting the compression mechanism. The compression mechanism is fixed in the sealed housing by using a bearing member, a frame member, or a cylinder member, which is a structural component, and a plurality of locations (generally, three to three) between the outer periphery and the sealed housing. In most cases, a fixed structure is used that is joined by welding or caulking at four locations.

  By the way, the bearing member, the frame member, or the cylinder member is often a cast iron product, and these members cannot be melted and directly welded to the steel sealed housing. Therefore, the pilot holes or grooves for welding or caulking coupling are processed into a plurality of locations on the outer peripheral surface of the cast iron bearing member, etc., and plug welding is performed between the sealed housing using the pilot holes or grooves, Alternatively, the compression mechanism is coupled and fixed inside the sealed housing by caulking the sealed housing in the pilot hole or groove (for example, see Patent Documents 1 to 3).

JP 2005-195005 A JP 2006-170102 A Japanese Patent No. 3567237

However, with the above-described plug welded structure and caulking structure, the load applied to the joint between the compression mechanism and the hermetic housing due to the rotational moment of the compression mechanism is large due to the use of an inverter in the recent large capacity hermetic electric compressor. Therefore, there is a concern that the load holding ability by the plug welding or caulking structure may be transiently exceeded. In particular, in the case of plug welding, welding is performed by blowing an arc from the outside of the hermetic housing to the cast iron bearing member with a welding torch and melting the welding rod with the heat generated at that time. The quality is likely to vary, which is the biggest cause of the above-mentioned concerns, and the countermeasures are desired.
(1) The welding rod may be melted in a state where heat is not sufficiently transmitted to the sealed housing, resulting in insufficient joining.
(2) Since the welding is performed in a stopped state, the molten metal may not flow properly.
(3) Since the arc is blown toward the cast iron containing a large amount of carbon, gas is easily generated, which adversely affects welding.

  The present invention has been made in view of such circumstances, and provides a hermetic electric compressor that can improve the coupling strength of a compression mechanism to a hermetic housing and can be sufficiently adapted to a large capacity inverter machine. Objective.

In order to solve the above problems, the hermetic electric compressor of the present invention employs the following means.
That is, a hermetic electric compressor according to the present invention includes a cylindrical steel plate hermetic housing and a compression mechanism having a cast iron structural component, and the compression mechanism includes the cast iron structural component via the cast iron structural component. In a hermetic electric compressor that is coupled and fixed inside a hermetic housing by a plurality of welds, a steel welding structure is provided at an outer peripheral portion corresponding to at least the plurality of welds of the cast iron structural component. The welding structure and the sealed housing are coupled and fixed by a plurality of welds.

  According to the present invention, a steel welded structure is fixed to the outer peripheral portion of a cast iron structural component, and a welded portion for coupling and fixing the compression mechanism to the inside of the hermetic housing is provided with a steel plate hermetic housing and a steel weld. Since the steel can be welded to the structure for welding, welding can be facilitated and welding defects can be almost eliminated. Therefore, it is possible to ensure sufficient coupling strength by reliable welding, and it can be sufficiently applied to a coupling structure of a compression mechanism in a large-capacity hermetic electric compressor that generates a large load with rotation. Moreover, since the positioning accuracy at the time of welding can be relieved significantly compared with the plug welding with respect to the pilot hole of the conventional cast iron structural components, productivity can be improved and manufacturing cost can be reduced. Moreover, since it is not necessary to provide a pilot hole for plug welding in the cast iron structural component, the manufacture of the cast iron structural component can be facilitated.

  In the hermetic electric compressor of the present invention, in the hermetic electric compressor, the welding structure and the hermetic housing are coupled and fixed by the welded portion at least at three locations on the circumference. It is characterized by.

  According to the present invention, since the welding structure and the hermetic housing can be coupled and fixed at least at three locations on the circumference by welding, the conventional three points can be improved because the welding strength at each location is improved. Compared with plug welding, the total welding strength can be increased. Therefore, the coupling strength of the compression mechanism with respect to the hermetic housing can be significantly improved.

  Moreover, the hermetic electric compressor according to the present invention is any one of the hermetic electric compressors described above, wherein the welding structure is fitted to the cast iron structural component and the hermetic housing at an inner periphery and an outer periphery thereof. It is characterized by comprising a cylindrical object.

  According to the present invention, since the welding structure is constituted by a cylindrical object, the welding position with the hermetic housing, the welding size, and the welding shape can be arbitrarily set within the size range. It becomes. Therefore, the degree of freedom of welding can be greatly increased, the productivity can be remarkably improved, and the welding strength can be arbitrarily adjusted.

  The hermetic electric compressor of the present invention is characterized in that, in the hermetic electric compressor, the cylindrical object is fixed to the outer periphery of the cast iron structural component by press fitting or shrink fitting.

  According to the present invention, the cylindrical object can be fixed to the outer periphery of the cast iron structural component by press fitting or shrink fitting. This cylindrical object is a dedicated part as a welding structure, and can have sufficiently high dimensional accuracy as compared with a sealed housing. Therefore, the necessary fixing strength for the cast iron structural component can be sufficiently ensured by press fitting or shrink fitting of the cylindrical object.

  Further, the hermetic electric compressor according to the present invention is any one of the hermetic electric compressors described above, wherein the cylindrical object and the hermetic housing are spaced apart in the axial direction of the cylindrical object at a plurality of locations in the welded portion. It is characterized by being coupled and fixed by.

  According to the present invention, the cylindrical object and the hermetic housing are coupled and fixed at a plurality of positions at intervals in the axial direction of the cylindrical object, so that the compression mechanism and the hermetic housing are coupled to each other by the rotational moment of the compression mechanism. The load in the vertical direction can be distributed and held at a plurality of locations in the axial direction. Accordingly, it is possible to reduce the load applied to each coupling portion and improve the coupling strength of the compression mechanism with respect to the sealed housing as a whole.

  Further, in the hermetic electric compressor according to the present invention, in the hermetic electric compressor, the axial length of the cylindrical object is longer than the axial length of the cast iron structural component, and the axial direction plural locations One of the welds is provided in a portion that is longer than the axial length of the cast iron structural component.

  According to the present invention, the length of the cylindrical object is made longer than the axial length of the cast iron structural component, and one of the welds is provided at the site, so that the welds between the multiple welds along the axial direction are provided. The distance can be made sufficiently large. Thereby, a part of load of the up-down direction applied to the joint location of the compression mechanism and the hermetic housing by the rotational moment of the compression mechanism can be dispersed in the radial direction. Therefore, by reducing the load in the vertical direction that is larger than the radial load and balancing the holding load, it is possible to improve the coupling strength of the compression mechanism to the hermetic housing.

  Further, the hermetic electric compressor of the present invention is any one of the hermetic electric compressors described above, wherein the distance between the welds at a plurality of locations along the axial direction is different from that of the compression mechanism due to the rotational moment of the compression mechanism. It is set to the distance which balances the up-down direction load and radial direction load concerning a joint location with the said airtight housing.

  According to the present invention, the distance between the welds at a plurality of locations along the axial direction is set to a distance that balances the vertical load and the radial load, so that the holding load at each joint location is made uniform. Can do. Therefore, an excessive load is not applied to a specific coupling portion, the holding load can be stabilized, and the coupling strength can be increased.

  In the hermetic electric compressor of the present invention, in any one of the hermetic electric compressors described above, the welding structure is constituted by a plate material that is bolted to a plurality of locations on the outer periphery of the cast iron structural component. It is characterized by.

  According to the present invention, since the welding structure is constituted by a plate member bolted to a cast iron structural component, the welding position, the welding size, and the welding position of the sealed housing are within the range of the plate member size. The shape can be arbitrarily set. Therefore, the degree of freedom of welding can be greatly increased, the productivity can be remarkably improved, and the welding strength can be arbitrarily adjusted.

  According to the present invention, the steel welding structure is fixed to the outer peripheral portion of the cast iron structural component, and the steel-sealed housing and the steel welding structure can be welded to each other. Welding is facilitated and sufficient bonding strength can be ensured by reliable welding. Therefore, the present invention can be sufficiently applied to a large-capacity inverter machine that generates a large load by rotational driving. Moreover, since the positioning accuracy at the time of welding can be relieved compared with plug welding, productivity can be improved and manufacturing cost can be reduced. Moreover, since it is not necessary to provide a pilot hole for plug welding in the cast iron structural component, the manufacture of the cast iron structural component can be facilitated.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a longitudinal sectional view of a scroll-type hermetic electric compressor 1 according to the first embodiment of the present invention. In the present embodiment, the scroll-type hermetic electric compressor 1 will be described as an example. However, the hermetic-type electric compressor of the present invention is not limited to the scroll type.
A scroll-type hermetic electric compressor 1 includes a hermetic housing 2 that is made of a steel plate and has a bottom shape that is long in the vertical direction. The upper portion of the sealed housing 2 is sealed by a discharge cover 3 and an upper cover 4, and a discharge chamber 5 is formed between the discharge cover 3 and the upper cover 4.

  In the hermetic housing 2, a scroll compression mechanism 7 is installed at an upper portion via an upper bearing member (frame member) 6, and an electric motor 10 including a stator 8 and a rotor 9 is disposed below the stator 8. Is fixed to the hermetic housing 2. A drive shaft 11 is fixed to the rotor 9 of the electric motor 10, and the scroll compression mechanism 7 can be driven by connecting a crank pin 12 provided at the upper end of the drive shaft 11 to the scroll compression mechanism 7. The lower end portion of the drive shaft 11 is supported by a lower bearing 13 provided at the lower portion of the sealed housing 2. A known positive displacement oil pump 14 is provided between the lower bearing 13 and the lower end portion of the drive shaft 11, and the lubricating oil 15 filled in the bottom of the hermetic housing 2 is sucked in via the suction pipe 16 and driven. The shaft 11 is configured to be discharged into an oil supply hole 17 formed along the axial direction in the shaft 11. The lubricating oil 15 is supplied to required portions such as the upper bearing member 6, the scroll compression mechanism 7, and the lower bearing 13 through the oil supply hole 17.

  The scroll compression mechanism 7 has the upper bearing member 6 as one of its structural parts, a fixed scroll member 18 fixedly installed on the upper bearing member 6, and slidably supported on the upper bearing member 6. The orbiting scroll member 19 meshed with the scroll member 18 to form the compression chamber 20 is interposed between the upper bearing member 6 and the orbiting scroll member 19 to prevent the orbiting scroll member 19 from rotating and to perform a revolving orbiting motion. A drive bushing that is interposed between an allowed rotation prevention mechanism 21 such as an Oldham ring and the crank pin 12 of the drive shaft 11 and the rear boss of the orbiting scroll member 19 and transmits the rotational force of the drive shaft 11 to the orbiting scroll member 19. 22, and the fixed scroll member 18 is installed on the upper bearing member 6 in a state of being connected to the discharge cover 3.

  The scroll compression mechanism 7 sucks the refrigerant gas sucked into the sealed housing 2 (low pressure housing) through the suction pipe 23 into the compression chamber 20 from the suction port 24 opened in the sealed housing 2, and the high temperature. Compress to high pressure gas. The compressed gas is discharged into the discharge chamber 5 through the discharge port 25 provided in the center of the fixed scroll member 18 and the discharge valve 26 provided in the discharge cover 3, and further connected to the discharge chamber 5. The discharge pipe 27 is discharged to the outside of the compressor.

The upper bearing member (frame member) 6 is made of cast iron. As shown in FIGS. 2 and 3, a cylindrical surface 30 facing the inner peripheral surface of the hermetic housing 2 is provided on the outer periphery thereof. Or it forms in at least one part. The upper bearing member 6 is used by cutting and finishing only necessary portions including the cylindrical surface 30, and the others are left as cast surface. A cylindrical member for welding 31 for fixing the upper bearing member 6 to the sealed housing 2 by welding is fixed to the cylindrical surface 30 by press-fitting or shrink fitting.
The welding cylinder 31 is made of steel, like the sealed housing 2, and its axial length is substantially the same as the axial length of the cylindrical surface 30, and the outer diameter is the inside of the sealed housing 2. The diameter is fitted to the peripheral surface.

The welding cylinder 31 and the sealed housing 2 are made of steel and can be welded. Therefore, as shown in FIGS. 2 and 3, the upper housing member 6 to which the welding cylinder 31 is fixed by press fitting or shrink fitting is fitted in a predetermined position in the hermetic housing 2, and the hermetically sealed housing 2. And the welding cylinder 31 are welded at a plurality of locations on the circumference (usually 3 to 4 locations at regular intervals, three examples are shown in the present embodiment), and the two are joined. Can do. The welded portion 32 firmly bonds and fixes the sealed housing 2 and the welding cylinder 31 by direct welding, and by extension, the scroll compression mechanism 7 is firmly fixed and installed in the sealed housing 2 via the upper bearing member 6. be able to.
As shown in FIG. 2, the circumferential position of the welded portion 32 may be a portion where the welding cylinder 31 is in contact with the upper bearing member 6. The position of the welded portion 32, the size of the weld, and the shape of the weld can be arbitrarily set without being constrained by the configuration on the upper bearing member 6 side.

Next, the operation of the hermetic electric compressor 1 according to this embodiment having the above-described configuration will be described.
When the electric motor 10 is rotationally driven, the drive shaft 11 is rotated together with the rotation of the rotor 9, and the orbiting scroll member 19 connected to the crank pin 12 is prevented from rotating by the rotation preventing mechanism 21, and the fixed scroll member. 18 is revolved and rotated. By driving the scroll compression mechanism 7, the refrigerant gas sucked into the sealed housing 2 through the suction pipe 23 is sucked into the compression chamber 20 through the suction port 24 opened in the sealed housing 2. The compression chamber 20 is reduced in volume as it moves from the outer peripheral side to the center side, and compresses the refrigerant gas during this time. The compressed high-temperature and high-pressure refrigerant gas is discharged to the discharge chamber 5 through the discharge port 25 and the discharge valve 26 provided in the central portion of the fixed scroll member 18, and further to the outside of the compressor via the discharge pipe 27. Is discharged.

  While the above compression action is performed by the scroll compression mechanism 7, the upper bearing member 6 is loaded with a load in the circumferential direction and the vertical direction by the rotational moment. This load is applied to the welded portion 32 that joins and fixes the upper bearing member 6 to the sealed housing 2 via the welding cylinder 31, and is further held by the sealed housing 2 via the welded portion 32. For this reason, the welding part 32 needs the load holding capability which can endure the said load, and the reliable welding with high precision without a variation in quality is calculated | required. In the present embodiment, a steel welding cylinder 31 is fixed to the outer periphery of the upper bearing member 6 by press fitting or shrink fitting, and the welding cylinder 31 and the steel plate sealed housing 2 are welded.

  As described above, since the welding cylinder 31 and the sealed housing 2 are each made of steel, it is possible to eliminate the above-described factors causing variations in the welding quality. Therefore, at the time of welding, the welding cylindrical body 31 and the sealed housing 2 can be melted together under the same conditions and can be firmly joined. As a result, it is possible to eliminate welding defects, perform stable welding with high accuracy, and have a desired target strength without variations in quality.

Thus, according to the present embodiment described above, the following effects are obtained.
Since the welding portion 32 for coupling and fixing the scroll compression mechanism 7 to the inside of the hermetic housing 2 is welding of steel between the steel-made hermetic housing 2 and the steel welding cylinder 31, welding is facilitated and welded. Most of the defects can be eliminated. Therefore, it is possible to ensure a sufficient bond strength by stable and accurate welding, and to secure a welding strength with a capacity that can be sufficiently adapted to a large load generated by a large capacity inverter machine. it can. That is, the welding cylinder 31 and the sealed housing 2 are welded at least at three locations on the circumference, but since the welding strength at each location is increased, the corresponding three-point plug welding is performed accordingly. Compared to the total welding strength can be increased. Thereby, the coupling strength of the scroll compression mechanism 7 with respect to the hermetic housing 2 can be remarkably improved.

In addition, by providing the welding cylinder 31, the welding position, the welding size, and the welding shape can be arbitrarily set as compared with the conventional plug welding with respect to the pilot hole. . For this reason, while being able to adjust welding strength easily, the positioning accuracy at the time of welding can be eased significantly. Thereby, productivity can be improved and manufacturing cost can be reduced. Moreover, since it is not necessary to provide a pilot hole for plug welding on the bearing member side, the manufacture of the upper bearing member 6 can be facilitated.
In addition, the welding cylinder 31 is fixed to the outer periphery of the upper bearing member 6 by press fitting or shrink fitting, but the welding cylinder 31 is a dedicated part as a welding structure and is compared with the sealed housing 2. Since the dimensional accuracy can be sufficiently increased, the fixing strength by press fitting or shrink fitting of the welding cylinder 31 can be sufficiently ensured.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The present embodiment is different from the first embodiment in that welding portions 32A are provided at a plurality of locations (two locations) in the axial direction of the welding cylinder 31. Since other points are the same as those in the first embodiment, description thereof will be omitted.
That is, in this embodiment, as shown in FIG. 4, the welded portion 32 </ b> A is not limited to three places on the circumference, but two places spaced apart in the axial direction (vertical direction in FIG. 4) of the welding cylinder 31. The number of welding points is increased. Note that the upper and lower welded portions 32A do not necessarily have to be at the same angular position on the circumference. For example, in the case of three equally spaced positions on the circumference, the upper and lower welded parts 32A may have positions shifted by 60 degrees.

  As described above, the rotational moment of the scroll compression mechanism 7 is obtained by coupling and fixing the welding cylinder 31 and the sealed housing 2 with the welded portions 32A at a plurality of positions at intervals in the axial direction of the welding cylinder 31. As a result, the load in the vertical direction applied to the joint portion of the compression mechanism 7 and the sealed housing 2, that is, the welded portion 32A, can be dispersed and held at a plurality of locations in the axial direction. For this reason, the load concerning each welding part 32A can be reduced, and the joint strength with respect to the sealed housing 2 of the compression mechanism 7 can be improved further as a whole.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
This embodiment is different from the first and second embodiments in that the length in the axial direction of the welding cylinder 31A is increased. Since other points are the same as those in the first and second embodiments, description thereof will be omitted.
That is, in this embodiment, as shown in FIG. 5A, the axial length of the welding cylinder 31A is made longer than the axial length of the upper bearing member 6, and is extended downward. One of the two welded portions 32A in the direction is provided in the downward extending portion.

  In this way, the length of the welding cylinder 31A is made longer than the axial length of the upper bearing member 6, and one of the welded portions 32A is provided at an extended portion thereof, so that a plurality of welds along the axial direction are provided. A sufficient distance can be secured between the portions 32A and 32A. By adopting such a configuration, a part of the load in the vertical direction applied to the welded portion 32A, that is, the portion where the compression mechanism 7 and the sealed housing 2 are joined by the rotational moment of the scroll compression mechanism 7 is shown in FIG. Further, it can be dispersed in the radial direction. For this reason, the load in the vertical direction, which is larger than the radial load, can be reduced and the holding load can be balanced. In this way, even by balancing the load applied to the plurality of welds 32A, it is possible to reduce the excessive excessive load and improve the coupling strength of the compression mechanism 7 to the sealed housing 2 as a whole.

In the third embodiment, the distance along the axial direction between the plurality of welded portions 32A and 32A may be set to a distance that balances the vertical load and the radial load applied to the welded portions 32A and 32A. it can.
Thus, by setting the distance along the axial direction between the plurality of welds 32A, 32A to a distance that balances the vertical load and the radial load, the holding load at each weld 32A is made uniform. can do. Accordingly, an excessive load is not applied to the specific welded portion 32A, the holding load can be stabilized, and the coupling strength can be increased.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS.
The present embodiment is different from the first embodiment in that bolts 41A and 41B are provided at outer peripheral portions corresponding to a plurality of welded portions of the upper bearing member 6. Since other points are the same as those in the first embodiment, description thereof will be omitted.
That is, in the present embodiment shown in FIG. 6, a portion that can be welded to the upper bearing member 6 by screwing the steel headless bolt 41 </ b> A into the outer peripheral portion corresponding to the welded portions of the upper bearing member 6 at a plurality of locations. The bolt 41 </ b> A and the sealed housing 2 are welded at the welded portion 32.
Further, in the present embodiment shown in FIG. 7, a portion that can be welded to the upper bearing member 6 by screwing steel hexagon socket head bolts 41 </ b> B into outer peripheral portions corresponding to the welded portions of the upper bearing member 6. The hexagonal hole of the bolt 41B and the hermetic housing 2 are welded by the welded portion 32.

  As described above, the steel bolts 41A and 41B are screwed into the outer peripheral portions corresponding to the plurality of welded portions of the upper bearing member 6, and the bolts 41A and 41B and the sealed housing 2 are welded together with steel. Thus, the upper bearing member 6 can be coupled and fixed to the sealed housing 2. Thereby, welding can be facilitated and welding defects can be almost eliminated. For this reason, it is possible to secure sufficient coupling strength by stable and accurate welding, and it can be applied sufficiently to the coupling structure of the compression mechanism 7 in a large capacity inverter machine that generates a large load with rotation. Is possible.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIGS.
The present embodiment is different from the first embodiment in that a plate material 51 is bolted to an outer peripheral portion corresponding to a plurality of welded portions of the upper bearing member 6. Since other points are the same as those in the first embodiment, description thereof will be omitted.
That is, in this embodiment, the rectangular steel plate material 51 is coupled and fixed to the outer peripheral portion corresponding to the plurality of welded portions of the upper bearing member 6 by the two bolts 52, and the rectangular plate material 51 and the sealed housing 2 are fixed. Are welded by the welded portions 32B and 32B at two locations, upper and lower.

  As described above, a rectangular steel plate member 51 is bolted to the outer peripheral portion of the upper bearing member 6, and the steel plate member 51 and the sealed housing 2 are welded together with steel to seal the upper bearing member 6 with the sealed housing. Therefore, it is possible to perform stable and accurate welding and secure a sufficient bonding strength. In addition, since the welding position, the welding size, and the welding shape with the hermetic housing 2 can be arbitrarily set within the range of the size of the plate material 51, the degree of freedom of welding can be greatly increased, and the productivity is greatly improved. And the welding strength can be arbitrarily adjusted.

  In addition, this invention is not limited to each above-mentioned embodiment, In the range which does not deviate from the summary, it can change suitably. For example, the present invention can be applied not only to a scroll type hermetic electric compressor but also to a rotary type or other type of hermetic electric compressor. Further, the shape and structure of the welding structure fixed to the outer periphery of the upper bearing member 6 can be variously changed.

1 is a longitudinal sectional view of a scroll hermetic electric compressor according to a first embodiment of the present invention. It is a principal part schematic cross-sectional view of the scroll-type hermetic electric compressor shown in FIG. It is a principal part schematic longitudinal cross-sectional view of the scroll-type hermetic electric compressor shown in FIG. It is a principal part schematic longitudinal cross-sectional view of the scroll-type hermetic electric compressor which concerns on 2nd Embodiment of this invention. It is a principal part schematic longitudinal cross-sectional view (A) and load direction analysis figure (B) of the scroll-type hermetic electric compressor which concerns on 3rd Embodiment of this invention. It is a principal part schematic longitudinal cross-sectional view of the scroll-type hermetic electric compressor which concerns on 4th Embodiment of this invention. It is a principal part schematic longitudinal cross-sectional view of the modification of the scroll-type hermetic electric compressor which concerns on 4th Embodiment of this invention. It is a principal part schematic longitudinal cross-sectional view of the scroll-type hermetic electric compressor which concerns on 5th Embodiment of this invention. It is a fragmentary perspective view of the scroll-type hermetic electric compressor shown in FIG.

Explanation of symbols

1 Sealed Electric Compressor 2 Sealed Housing 6 Upper Bearing Member (Cast Iron Component)
7 Scroll Compression Mechanism 31 Welding Cylinders 32, 32A, 32B Welds 41A, 41B Bolt 51 Plate Material 52 Bolt

Claims (8)

A cylindrical steel plate sealed housing, and a compression mechanism having a cast iron structural part,
In the hermetic electric compressor, the compression mechanism is coupled and fixed to the inside of the hermetic housing through the cast iron structural parts by a plurality of welds.
A steel welding structure is fixed to an outer peripheral portion corresponding to at least the plurality of welds of the cast iron structural component,
The hermetic electric compressor, wherein the welding structure and the hermetic housing are coupled and fixed by a plurality of welds.   The sealed electric compressor is characterized in that the welding structure and the sealed housing are coupled and fixed by the welded portion at least at three locations on the circumference.   3. The hermetic electric motor according to claim 1, wherein the welding structure is constituted by a cylindrical object whose inner periphery and outer periphery are fitted to the cast iron structural component and the hermetic housing. Compressor.   4. The hermetic electric compressor according to claim 3, wherein the cylindrical object is fixed to the outer periphery of the cast iron structural component by press fitting or shrink fitting.   5. The hermetic electric compressor according to claim 3, wherein the cylindrical object and the hermetic housing are coupled and fixed by the welded portion at a plurality of locations at intervals in the axial direction of the cylindrical object. .   The axial length of the cylindrical body is longer than the axial length of the cast iron structural component, and one of the welds at the plurality of axial locations is longer than the axial length of the cast iron structural component. The hermetic electric compressor according to claim 5, wherein the hermetic electric compressor is provided at a portion that is provided.   The distance between the welds at a plurality of locations along the axial direction is set to a distance that balances the vertical load and the radial load applied to the joint between the compression mechanism and the sealed housing by the rotational moment of the compression mechanism. The hermetic electric compressor according to claim 5, wherein the hermetic electric compressor is provided. 3. The hermetic electric compressor according to claim 1, wherein the welding structure is configured by a plate member that is bolted to a plurality of locations on the outer periphery of the cast iron structural component.

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