JPH0410389Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a hermetic scroll compressor used in refrigeration and air conditioning equipment, and relates to improvements in the arrangement and installation of its internal elements.

[Conventional technology]

Figure 2 shows a vertical cross-sectional view of a conventional hermetic scroll compressor for refrigeration and air conditioning. The motor is located. The compression element includes a fixed scroll 1, an orbiting scroll 2, a rotation prevention member 3 that allows the orbiting scroll 2 to revolve and prohibits rotation, and a shaft 5 that connects the electric motor 4 and the compression element. The fixed scroll 1 and the electric motor 4
The housing 8 includes a frame 6 that locks the shaft 5, an upper bearing 71 and a lower bearing 72 that support the shaft 5, an orbiting bearing 73 that rotationally supports the orbiting scroll 2, a thrust bearing 74 that supports the orbiting scroll 2 in the axial direction, and the like. It is stored inside. Lubricating oil 81 is sealed in the lower part of the housing 8.

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

The orbiting scroll 2 is made up of the end plate 21 and a spiral 22 formed integrally with the end plate 21. Further, on the opposite side of the spiral 22 of the end plate 21, a boss 2 for driving the orbiting scroll 2 is provided.
3, and an orbiting bearing 73 for connecting the shaft 5 and the orbiting scroll 2 is disposed on the boss 23. Note that 84 is a balance weight attached to the shaft 5.

Next, the flow of refrigerant gas in the above scroll compressor will be explained. The low-temperature, low-pressure refrigerant gas returned to the compressor from the refrigeration/air conditioning unit (not shown) is introduced into the space inside the housing 8 through the suction pipe 82, cools the electric motor 4, and passes through the outer periphery of the frame 6. The air is introduced from a suction passage 15 provided in the fixed scroll 1 into a suction chamber 16 provided outside the fixed scroll 1 . An eccentric pin 53 is integrally formed in the shaft 5, and the eccentric pin 53
A drive bush 54 is interposed therein, and the drive bush 54 is interposed in an orbiting bearing 73 provided on the boss 23 of the orbiting scroll 2.

The orbiting scroll 2 driven by the electric motor 4 performs a revolution movement due to the rotation prevention member 3 that allows revolution and prohibits rotation.
A closed space 2 formed by both spirals 12 and 22 of
4 gradually decreases its space and reaches the center of the scroll, and as the space volume decreases during this time, the pressure and temperature of the refrigerant gas rises, and the refrigerant gas is discharged from the discharge port 13 of the fixed scroll 1 via the discharge valve 17 to the discharge cavity. The high-temperature, high-pressure refrigerant gas within the discharge cavity 14 is discharged to the outside of the compressor via the discharge pipe 83.

On the other hand, lubricating oil 8 stored at the bottom of the housing 8
1 is partially supplied with oil to the lower bearing 72 by a centrifugal pump 51 provided on the shaft 5 through an oil supply hole 52 provided eccentrically from the shaft center.
Furthermore, the swing bearing 73, thrust bearing 74, rotation prevention member 3, etc. are lubricated through the eccentric pin 53 of the shaft 5, and the bearing 71 is lubricated through the frame chamber 61 of the frame 6. It is configured to be discharged to the bottom.

The housing 8 also includes a lower housing 8.
5 and the housing 87 are arranged, and these are welded at welding portions 88-a and 88-b to form a closed container.

The frame 6 to which the compression element part and the electric motor 4 are integrally attached is dropped into a stepped part provided in the housing 8, and a discharge cavity lid 14- is fixed to the fixed scroll 1 with bolts 14-2.
1 is set in the housing 8 by brazing or welding the upper housing 87.

[Problem that the invention attempts to solve]

The conventional hermetic scroll compressor described above has the following drawbacks.

(1) The noise radiating members in a hermetic compressor are the housing 8, the upper housing 87, and the lower housing 85 that constitute the hermetic container, and the rigidity of the housing 8 is low and the noise from these parts is large. Ta.

(2) The high-temperature, high-pressure discharge gas discharged into the discharge cavity 14 via the discharge valve 17 is discharged once per rotation of the compressor, but the volume of the discharge cavity 14 is sufficiently large. Therefore, it has been difficult to suppress the pressure pulsations of the discharged gas to a sufficiently low level. For this reason, noise and vibration problems caused by discharge pulsation may occur in devices outside the compressor.

(3) The discharge cavity 14 is constructed by fastening a discharge cavity lid 14-1 to a volume part provided integrally with the fixed scroll 1 with bolts 14-2, and the outside of the discharge cavity 14 is fixed. Everything is at low temperature except for the compression part of scroll 1.
In contact with low pressure suction gas. Therefore, the heat of the high temperature discharged gas in the discharge cavity 14 is transferred to the discharge cavity lid 14-1 and the fixed scroll 1.
The temperature of the low-temperature intake gas increases as it passes through the walls of the
This was reducing the efficiency of the compressor.

(4) Upper compressor element section and lower electric motor 4
The housing 8 of the frame 6 integrally supports the
The mounting structure was inadequate.

(5) Furthermore, the suction gas that has returned into the housing 8 from the suction pipe 82 passes through the outer periphery of the frame 6 and is sucked into the fixed scroll 1 and the orbiting scroll 2 from the suction passage 15; A shim is inserted into the mating surface of the frame chamber 61 to adjust the vertical clearance between the fixed scroll 1 and the orbiting scroll 2. Since this shim is not necessarily ring-shaped, the lubricating oil in the frame chamber 61 can be absorbed through the gap between the shims. As a result, the suction gas in the suction passage 15 sometimes contained a large amount of oil.

(6) Also, the outer peripheral part 2a of the end plate 21 of the orbiting scroll 2 is disengaged from the inner peripheral part 1a of the fixed scroll 1 during rotation, and the suction chamber 16 and the frame chamber 61
The frame chamber 6 communicates with the frame chamber 6 through this opening.
1, lubricating oil 81 was supposed to be sucked into the intake gas. From the above points, in the conventional structure, a large amount of lubricating oil 81 enters the suction gas of the compressor, and as a result, a large amount of lubricating oil 81 is present in the refrigerant gas discharged to the outside of the compressor. This has disadvantages such as deteriorating the heat transfer characteristics of the compressor, or lubricating oil 81 being carried into the heat exchanger, reducing the amount of lubricating oil 81 in the compressor and causing poor lubrication of sliding parts.

Therefore, the purpose of this invention is to eliminate the above-mentioned drawbacks, and the intended purpose is (1) low noise, (2) small discharge pulsation, and (3) low internal heat transfer loss due to discharged gas. (4) The support structure of the internal assembly is reliable, and (5) the proportion of lubricating oil contained in discharged gas, that is, the oil circulation ratio, is reduced. It is something that I try to do.

[Means for solving problems]

In order to achieve the above object, the present invention is a sealed housing in which a scroll compression element consisting of a fixed scroll and an orbiting scroll and an electric motor are installed via a frame in a sealed housing having an upper housing whose upper part is sealed. In the type scroll compressor, the frame formed by providing at least one refrigerant gas suction passage on the outer periphery is shrink-fitted and fixed to the housing, and the fixed scroll is fastened and fixed to the frame with bolts, An outer peripheral flange is formed on a top plate provided above the fixed scroll to form a discharge chamber, and the top plate, the housing, and the upper housing are welded all around at this flange, and the top plate and the upper housing are welded all around. and a second discharge chamber communicating with the discharge chamber, and further comprising a refrigerant discharge pipe connected to the upper housing.

[Effect]

As described above, by determining the overall structure of the compressor, not only can noise be reduced, discharge pulsation is small, oil circulation rate is low, and compressor efficiency can be increased, but also cost and external dimensions can be increased. It is possible to provide a hermetic scroll compressor that does not cause

〔Example〕

Hereinafter, an embodiment of the hermetic scroll compressor of the present invention will be described with reference to the vertical cross-sectional view of FIG. 1. Here, the same parts as in FIG. , only the differences from FIG. 2 will be explained.

1 Fasten the fixed scroll 1 and the frame 106 with bolts 200 in the same manner as in the conventional case, and shrink-fit the outer periphery 100 of the frame 106 to the inner circumferential surface of the housing 8 (this shrink-fit portion is shown in FIG. 1). (indicated by ×××××). In this case, the shrink fit length and shrink fit margin between the frame 106 and the housing 8 may be determined as appropriate.

2. A recess is provided in the upper part of the fixed scroll 1, similar to the conventional one, and the top plate 101 is fastened to the fixed scroll 1 with bolts 105 on this upper part, and the first
A discharge chamber 102 is configured. Furthermore, the top plate 101
housing 8 and upper housing 103 and 1
The parts 10a and 110b are welded to form the second discharge chamber 104.

The top plate 101 has a first discharge chamber 102 and a second discharge chamber 102.
A discharge passage 108 that communicates with the discharge chamber 104 is provided, and a discharge pipe 109 is provided in the upper housing 103.
Connect.

3. On the outer periphery of the frame 106 that is shrink-fitted to the housing 8, one to two or several frame outer periphery suction passages 107 are provided so as to guide suction gas from the lower part to the suction passage 15 of the fixed scroll 1.

On the other hand, the outer diameter of the end plate 121 of the orbiting scroll 120 is the same as that of the fixed scroll 1 at any position during the revolution of the orbiting scroll 120 (during one revolution of the shaft).
The inner peripheral part 1a of the fixed scroll is disengaged from the outer peripheral part 2a of the orbiting scroll, so that the suction chamber 16 of the fixed scroll does not open into the frame chamber 61.

The configuration of the embodiment as described above provides the following effects.

(1) Since the frame 106 is shrink-fitted to the housing 8, the rigidity of the housing 8 is increased, and the noise emitted from the housing 8 is significantly reduced. Therefore, noise, which was a problem with conventional devices, can be reduced. Thereby, there is no need for the housing 8 to have any special construction, for example to be made of a damping material.

(2) Also, the fixed scroll 1 is integrally fastened to the frame 106, and the compression element portion and the electric motor 4
Since the internal element configured in the section is fastened to the housing 8 at this shrink fit part, the force of the internal element does not act on the discharge pipe 83 unlike in conventional devices, and the internal element is supported. The structure becomes reliable.

(3) In the conventional device, the volume of the discharge cavity 14 was not sufficient, resulting in large discharge pressure pulsations, but according to the above embodiment, the first discharge chamber 1
02 and the second discharge chamber 104, an extremely large discharge volume can be obtained, and as a result, discharge pressure pulsations can be significantly reduced. Therefore, all the noise and vibration problems caused by the equipment outside the compressor that occurred in the conventional equipment can be solved.

(4) Further, of the discharge chambers 102 and 104, a part of the outer wall of the second discharge chamber 104 is connected to the upper housing 10.
3, the heat of the high-temperature discharged gas is transmitted through the upper housing 103 and radiated to the outside of the compressor. In addition, compared to conventional devices, the surface area of the parts that surround the discharge gas and are exposed to the suction gas is significantly reduced, which greatly reduces the possibility of the high temperature of the discharge gas heating the suction gas. Machine efficiency can be improved.

(5) By providing a frame outer periphery suction passage 107 on the outer periphery of the frame 106 and limiting the portion of the outer periphery of the frame 106 where the intake gas flows from the bottom to the top only to the suction passage 107, The suction of lubricating oil into the suction gas through the shim gap between the fixed scroll 1 and the frame is limited, and the lubricating oil 81 is restricted from entering the suction gas, so that only a small amount of lubricant oil 81 mixes into the suction gas. I will do it.

(6) On the other hand, by configuring the outer diameter of the end plate 121 of the orbiting scroll 120 so as not to open into the suction chamber 16 of the fixed scroll 1, the frame chamber 12
The lubricating oil 81 in 1 does not enter the compressor.

From the above points, the oil circulation rate of the compressor can be significantly reduced.

(7) By configuring the structure of the hermetic scroll compressor as described above, in addition to the effects mentioned above, (a) special members for reducing noise (for example, vibration damping material for the housing) can be obtained. etc. are unnecessary.

(b) No special means are required to improve the efficiency of the compressor, resulting in a low-cost machine.

(c) The number of parts is the same as the conventional one, and the machine cost does not increase.

(d) Furthermore, the present invention has the feature that the size of the machine does not change in any way and can be handled with the same size as conventional machines.

[Effect of idea]

The present invention described above is constructed as follows. That is, in a hermetic scroll compressor in which a scroll compression element consisting of a fixed scroll and an orbiting scroll and an electric motor are installed via a frame in a hermetic housing having an upper housing whose upper part is hermetically sealed, The frame formed with at least one refrigerant gas suction passage is shrink-fitted and fixed to the housing, the fixed scroll is fastened and fixed to the frame with bolts, and a discharge chamber is provided in the upper part of the fixed scroll. An outer periphery flange is formed on a top plate provided to constitute a top plate, and the top plate, the housing, and the upper housing are welded all the way around the flange, and the top plate and the upper housing communicate with the discharge chamber. A second discharge chamber is formed, and a refrigerant discharge pipe is further connected to the upper housing.

With this configuration, noise is low, discharge pulsation is small, internal heat transfer loss due to discharged gas is reduced, efficiency is high, the support structure of the internal assembly is reliable, and the lubrication contained in the discharged gas is reduced. A hermetic scroll compressor with a reduced oil ratio (oil circulation ratio) can be provided.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a hermetic scroll compressor according to the present invention, and FIG. 2 is a longitudinal sectional view showing an example of a conventional hermetic scroll compressor. 1...Fixed scroll, 8...Housing, 1
6... Suction chamber, 61... Frame chamber, 100...
Outer periphery of frame, 101... Top plate, 102... First discharge chamber, 103... Upper housing, 104
...Second discharge chamber, 106...Frame, 107
... Suction passage, 120 ... Orbiting scroll, 12
1...End plate.

Claims (1)

[Claims for Utility Model Registration] A sealed scroll in which a scroll compression element consisting of a fixed scroll and an orbiting scroll and an electric motor are installed via a frame in a sealed housing having an upper housing whose upper part is sealed. In the compressor, the frame formed by providing at least one refrigerant gas suction passage on the outer periphery is shrink-fitted and fixed to the housing, the fixed scroll is fastened and fixed to the frame with bolts, and the fixed scroll is fastened and fixed to the frame with bolts. An outer peripheral flange is formed on a top plate provided at the top of the scroll to constitute a discharge chamber, and the top plate, the housing, and the upper housing are welded all around at this flange, and the top plate and the upper housing are welded together. A hermetic scroll compressor comprising a second discharge chamber communicating with the discharge chamber, and further comprising a refrigerant discharge pipe connected to the upper housing.