JPH0617011Y2 - Closed scroll fluid machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sealed fluid machine used for a refrigeration / air-conditioning device such as a scroll type compressor.

[Conventional technology]

As an example of the hermetically sealed fluid machine, a hermetically sealed refrigeration / air conditioning scroll compressor will be described with reference to FIGS. 3 and 4.

FIG. 3 is a vertical cross-sectional view showing the entire scroll compressor. The container of the compressor is a cylindrical housing 8 and an upper housing.
It is composed of 87 and a lower housing 85, and the drive body is housed inside the container. The compression element part on the top of the drive body,
An electric motor is arranged at the bottom. The compression element portion includes a fixed scroll 1, an orbiting scroll 2, and a rotation preventing member 3 that allows the orbiting scroll 2 to revolve and prevent rotation.
In addition to these, a shaft 5 for connecting the electric motor 4 and the compression element portion, a frame 6 for locking the fixed scroll 1 and the electric motor 4, an upper bearing 71 for supporting the shaft 5, a lower bearing 72, and an orbiting scroll 2 are provided. Slewing bearing that supports rotation
73, thrust bearing for supporting the orbiting scroll 2 in the axial direction
74 and the like are housed in the cylindrical housing 8. Lubricating oil 81 is enclosed in the lower portion of the cylindrical housing 8.

The fixed scroll 1 is composed of an end plate 11 and a spiral 12 integrally formed with the end plate 11. The end plate 11 has a discharge port 13,
A discharge cavity 14 is provided on the opposite side of the discharge valve 17 and the spiral winding 12.

The orbiting scroll 2 includes an end plate 21 and a spiral 22 integrally formed with the end plate 21, and a boss 23 for driving the orbiting scroll 2 is provided on the opposite side of the end plate 21 from the spiral 22. An orbiting bearing 73 that connects the shaft 5 and the orbiting scroll 2 is arranged on the boss 23. Reference numeral 84 is a balance weight attached to the shaft.

Next, the flow of the refrigerant gas in the scroll compressor will be described. The low temperature / low pressure refrigerant gas returned to the compressor from the refrigeration / air conditioning unit (not shown) passes through the suction pipe 82,
A suction chamber, which is introduced into the space inside the cylindrical housing 8, cools the electric motor 4, passes through a part of the outer periphery of the frame 6, and is provided outside the fixed scroll 1 through a suction passage 15 provided in the fixed scroll 1. Introduced in 16. The orbiting scroll 2 driven by the electric motor 4 revolves by the rotation preventing member 3 that allows revolving and prohibits revolving, and the closed space 24 formed by both vortex windings 12 and 22 of both scrolls 1 and 2 gradually increases. The space is reduced to the center of the scroll,
During this period, the pressure and temperature of the refrigerant gas rise as the space volume decreases, and the refrigerant gas is discharged from the discharge port 13 of the fixed scroll 1 to the discharge cavity 14 via the discharge valve 17, and the high temperature and high pressure in the discharge cavity 14 are discharged. The refrigerant gas is sent out of the compressor via the discharge pipe 83.

On the other hand, the lubricating oil 81 stored in the lower part of the cylindrical housing 8 is
A centrifugal pump 51 provided in the shaft 5 partially supplies oil to a lower bearing 72 via an oil supply hole 52 provided eccentrically from the center of the shaft 5, and further a swivel bearing 73 via an eccentric pin 53 of the shaft 5. The thrust bearing 74, the rotation preventing member 3, etc. are lubricated to reach the frame chamber 6 of the frame 6 and the upper bearing 71
Is lubricated and is discharged to the lower portion of the cylindrical housing 8 through the oil drain hole 62.

Here, the casing forming the pressure vessel is composed of the aforementioned cylindrical housing 8, the lower housing 85, the top plate 86 forming the discharge cavity 14, and the upper housing 87,
Each member is integrally connected by welding (88-a, 88-b, 88-c). That is, the fixed scroll 1 is connected to the top plate 86 and the bolt 89 to form the discharge cavity 14.
The second space 14-1 between the top plate 86 and the upper housing 87 is configured as a pressure pulsation attenuator.

The discharge cavity 14 on the high-pressure side and the inside of the cylindrical housing 8 on the low-pressure side on the side of the high-pressure side are sealed by a seal material (14-2) between the fixed scroll 1 and the top plate 86. The section 1401 of 2 includes an upper housing 87 and a top plate 86.
The welding is separated from the outside air by the welding 88-a, and the inside of the low-pressure side cylindrical housing 8 is sealed by the cylindrical housing 8, the lower housing 85, the top plate 86 and their welded portions 88-c, 88-b.

[Problems to be solved by the invention]

The hermetic compressor constructed as described above has the following drawbacks. Welding top plate 86 and upper housing 87 88-a
Alternatively, by welding 88-b between the top plate 86 and the housing 8,
The top plate 86 is deformed as shown by the broken line in FIG. 4 (the deformation amount is shown large in FIG. 4 for the sake of clarity), and this deformation of the top plate 86 causes the seal between the top plate and the fixed scroll 1 to be increased. High pressure gas leaked from the discharge cavity 14 to the low pressure side inside the cylindrical housing 8, causing deterioration of the performance of the compressor.

(B) Since the top plate 86 and the fixed scroll 1 are connected by the bolts 89, the deformation of the top plate 86 may deform the fixed scroll 1 and, in turn, may deteriorate the performance of the compressor.

[Means for solving problems]

In order to prevent the top plate that is welded to the cylindrical housing or the upper housing and is connected to the fixed scroll with bolts etc. from reaching the fixed scroll etc. such as deformation and distortion of the top plate due to welding, make a groove in the outer peripheral part of the top plate. Provide or reduce the thickness of the outer peripheral portion of the top plate.

[Action]

Due to the above-mentioned groove or thin plate, deformation and distortion due to welding of the top plate are absorbed in the vicinity of the groove with low rigidity or in the thin plate portion, and leakage from the seal material with the fixed scroll or the fixed scroll Problems such as deformation can be solved.

〔Example〕

FIG. 1 shows an embodiment in which the present invention is applied to a scroll compressor, and the entire structure of the scroll compressor is the same as the conventional device shown in FIG.

In FIG. 1, 100 is a top plate according to the present invention, which is a ring-shaped groove 101, 102 outside the place where it abuts against the fixed scroll 1.
To provide. This groove has a sufficient strength for the load due to the differential pressure between the pressure inside the second space 14-1 and the pressure inside the cylindrical housing 8 outside the sealing material 14-2, and the top plate 100 as a whole. From the intensity distribution of, the groove portions 101 and 102 are weakest. Similar to the conventional one, the top plate 100 is joined with the fixed scroll 1 and the vault 89 via the sealing material 14-2, and the outer periphery of the top plate 100 is welded to the cylindrical housing 8 and the upper housing 87 (88). -b, 88-a) are integrated.

With the above configuration, the top plate 100 by welding (88-a, 88-b)
Distortion (deformation) occurs near the grooves 101, 102 having the lowest strength, and the deformation is not transmitted to the location inside the grooves 101, 102 where the fixed scroll 1 and the seal material 14-2 are installed.

That is, the deformation and distortion of the top plate escapes in the grooves 101 and 102, and the deformation and distortion of the inner portion do not occur, so that there is no leakage from the sealing material 14-2 or deformation of the fixed scroll 1, and the performance of the compressor is not deteriorated. And a machine with good performance can be provided.

In the embodiment shown in FIG. 1, two grooves are provided near the outer periphery of the top plate, but the number of grooves may be one or three or more.

FIG. 2 shows a thin plate of the outer peripheral portion of the top plate instead of the grooves 101 and 102 of FIG. 1. In FIG. 2, 105 is a top plate, and the plate thickness of the outer peripheral portion 106 of the top plate 105. Is thin. The operation and effect are similar to those of the embodiment shown in FIG.

[Effect of device]

By providing a strain absorbing part such as a thin part on the outer peripheral part of the top plate welded to the upper housing and the cylindrical housing, deformation of the seal part between the drive body and the top plate coupled to the top plate is prevented. The leakage of the fluid to be compressed at the seal portion is prevented, and the performance of the compressor is improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a sealed fluid machine according to an embodiment of the present invention near a top plate, and FIG. 2 is a first embodiment of another embodiment of the present invention.
FIG. 3 is a drawing similar to the drawing, FIG. 3 is an overall view of a conventional scroll compressor, and FIG. 4 is a sectional view showing a modification of the top plate in the apparatus shown in FIG. 1 ... Fixed scroll 1, 14-2 ... Sealing material 8 ... Cylindrical housing, 87 ... Upper housing 100 ... Top plate, 101, 102 ... Groove

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masahiro Hori 3-chome, Asahi-cho, Nishibiwajima-cho, Nishi-Kasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Nagoya Cold Energy Works (72) Inventor Ryuhei Tanigaki Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Asahi-cho 3-chome 1 Nagoya Mitsubishi Heavy Industries Co., Ltd. Nagoya Refrigeration Works (72) Inventor Takeda Koon Aichi Prefecture Nishi Kasugai-gun Nishibiwajima-cho, Asahi-cho 3-chome Mitsubishi Heavy Industries Nagoya Refrigeration Works (56) References JP-A-60-201095 (JP, A) Actual development Sho-62-130196 (JP, U) Actual public Sho-60-27836 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A scroll fluid mechanism having a fixed scroll and an orbiting scroll in a hermetically sealed housing formed by hermetically sealing an upper part and a lower part of a cylindrical housing with an upper housing and a lower housing, respectively. In a hermetic scroll fluid machine containing an electric motor connected to a drive shaft, a frame is fixed to the cylindrical housing, the drive shaft is supported by the frame, and the rotor of the electric motor is mounted on the drive shaft. The electric motor is fitted to the frame and the electric motor is fixedly supported on the frame, the fixed motor is fixed to the frame, the orbiting scroll is connected to the drive shaft, and the orbiting scroll is connected to the frame. A scroll fluid machine with a rotating scroll rotation blocking mechanism And a top plate that is connected to the back side of the fixed scroll and divides the closed housing into a low pressure side and a high pressure side, and forms a fluid discharge chamber between the top housing and the outer circumference of the top plate. A hermetically sealed scroll fluid machine characterized in that an annular thin wall portion is formed between a welded portion of the top plate and a housing and a joint portion of the fixed scroll.