JP2948389B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional scroll type compressor.
An example is shown. The inside of the sealed housing 8 is partitioned by a discharge cover 31 into a high-pressure side 44 and a low-pressure side 45. On the low-pressure side 45, a scroll-type compression mechanism C is provided at an upper part thereof, and an electric motor M is provided at a lower part thereof, and these are interlockingly connected to each other via a rotary shaft 5. The electric motor M includes a rotor Ma and a stator Mb. The rotor Ma is fixed to the rotary shaft 5, and the stator Mb is fixed to the closed housing 8.

The scroll type compression mechanism C has a fixed scroll 1 and an orbiting scroll 2. The fixed scroll 1 has an end plate 11 and a spiral wrap 12 erected on the inner surface thereof, and a discharge port 13 is provided at the center of the end plate 11. The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21, and a drive bush 54 is provided with a slewing bearing 73 in a boss 23 erected on the outer surface of the end plate 21.
And is rotatably inserted through the connector. A rotary shaft 5 is provided in a slide hole 55 formed in the drive bush 54.
An eccentric pin 53 protruding from the upper end of the connector is slidably fitted.

A plurality of closed spaces 24 are formed by eccentrically fixing the fixed scroll 1 and the orbiting scroll 2 with each other by a predetermined distance and shifting the fixed scroll 1 and the orbiting scroll 2 by an angle of 180 degrees. The orbiting scroll 2 is slidably supported on a frame 6 fixed and installed in a sealed housing 8, and allows the orbiting scroll 2 to revolve orbit between the orbiting scroll 2 and the frame 6. A rotation preventing mechanism 3 including an Oldham link or the like for blocking is provided.

[0005] The fixed scroll 1 is supported by the frame 6 so as to be able to levitate via a support spring 32 disposed on the outer periphery of the frame 6. Concentric cylindrical flanges 15 and 16 are provided on the back surface of the end plate 11 of the fixed scroll 1 so as to project upward.
An intermediate pressure chamber 40 is formed by fitting cylindrical flanges 38 and 39 projecting downward from the lower surface of the discharge cover 31 in a slidable manner. The intermediate pressure chamber 40 communicates with the sealed space 24 in the middle of gas compression through a pressure guiding hole 41 formed in the end plate 11, and a high pressure chamber 42 is provided on the inner peripheral side of the intermediate pressure chamber 40. Low pressure chamber 43 on outer side
Are formed respectively. The upper end of the rotary shaft 5 is supported by an upper bearing 71 provided on the frame 6, and the lower end is supported by a lower bearing 72 provided on the stay 14.

When the electric motor M is driven, the orbiting scroll 2 is driven via the rotary shaft 5, the eccentric pin 53, the drive bush 54, the orbiting bearing 73 and the boss 23, and the orbiting scroll 2 is rotated by the anti-rotation mechanism 3. While being blocked, it makes a revolving motion on a circular orbit having the orbital radius. Then, the gas enters the low-pressure side 45 via the suction pipe 82, and is sucked into the closed space 24 from the low-pressure chamber 43 through the passage 61. Then, as the volume of the closed space 24 decreases due to the revolving orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, enters the high-pressure side 44 from the discharge port 13 through the high-pressure chamber 42, and from there the discharge pipe 83 Is discharged to the outside.

At this time, a back pressure load based on the gas pressure in the high pressure chamber 42 and the intermediate pressure chamber 40 acts on the fixed scroll 1,
The fixed scroll 1 is pressed against the orbiting scroll 2 to prevent gas from leaking from the closed space 24. When the liquid is sucked into the closed space 24, the fixed scroll 1 floats against the support spring 32 and escapes the liquid, thereby preventing the scroll-type compression mechanism C from being damaged.

[0008]

In the above-described conventional scroll compressor, the discharge cover 31 is heated by the high-temperature gas in the high-pressure side 44, and is sucked from the low-pressure chamber 43 into the closed space 24 by the discharge cover 31. However, there is a problem that the efficiency of the scroll compressor is reduced because the gas is heated.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its gist is to provide a discharge cover for partitioning the inside of a sealed housing into a high pressure side and a low pressure side. The fixed scroll and the orbiting scroll are meshed with each other and housed on the low pressure side,
The fixed scroll is floatably supported on a frame fixedly installed in the sealed housing, and a high-pressure chamber, an intermediate-pressure chamber, and a low-pressure chamber are sequentially arranged radially from a center between a back surface of the fixed scroll and the discharge cover. A plurality of seals formed by engaging the fixed scroll and the orbiting scroll through the low-pressure chamber from the low-pressure side by forming a chamber and making the orbiting scroll revolve orbit while preventing its rotation. In a scroll compressor that compresses a gas sucked into a space and discharges the compressed gas from the high-pressure chamber through the high-pressure side, and simultaneously introduces a gas being compressed into the intermediate pressure chamber in the closed space. A shielding member for covering the surface of the discharge cover on the low-pressure chamber side at a predetermined interval. Rukoto by in the scroll compressor, characterized in that the formation of the space in which the gas is stagnant or encapsulated between the surface and the shielding member.

[0010]

[0011]

According to the present invention, since the above structure is provided, the heat of the high-temperature gas flowing on the high pressure side due to the gas stagnated or sealed in the space formed between the discharge cover and the shielding member is discharged. The transmission to the gas flowing through the low-pressure chamber through the cover is suppressed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIG. By providing a shielding plate 35 for covering the upper surface of the discharge cover 31 at a predetermined interval, a high-pressure side
A space 36 communicating with 44 via a minute gap is formed. Further, by disposing a shielding plate 37 that covers the surface of the discharge cover 31 on the side of the low-pressure chamber 43 at a predetermined interval, a space 38 that communicates with the low-pressure chamber 43 via a minute gap is formed therebetween. ing.

The gas stagnating in the spaces 36 and 38 forms a thermal resistance, and the heat of the high-temperature discharge gas flowing in the high-pressure side 44 flows through the low-pressure chamber 43 via the discharge cover 31. Therefore, it is possible to prevent the temperature of the suction gas sucked into the closed space 24 from the low-pressure chamber 43 from rising. Note that the spaces 36 and 38 can be completely closed from the high-pressure side 44 or the low-pressure chamber 43 by sealing them. In this case, the inside of the spaces 36 and 38 is evacuated or a gas such as air with low thermal conductivity is used. To form a thermal resistance.

As shown in FIG. 2, shield plates 33 are alternately provided below the discharge cover 31 from the end plate 11 of the fixed scroll 1 and the sealed housing 8 so that the discharge cover 31 and the shield plate 33 are connected to each other. A space 34 may be formed between the spaces 34 so that the gas stays in the space 34. In FIGS. 1 and 2, members corresponding to those shown in FIG. 5 are denoted by the same reference numerals.

[0015]

[0016]

According to the present invention, the heat of the high-temperature gas flowing on the high-pressure side is discharged by the gas stagnated or enclosed in the space formed between the surface of the discharge cover on the low-pressure chamber side and the shielding member. Transmission to the suction gas flowing through the low-pressure chamber via the cover can be suppressed.
As a result, it is possible to prevent a rise in the temperature of the suction gas sucked into the scroll compression mechanism from the low-pressure chamber, so that the volume efficiency of the scroll compressor is improved, and thus the performance thereof can be improved.

[0017]

[Brief description of the drawings]

FIG. 1 is a partial vertical cross-sectional view of a scroll compressor according to a first embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional view of a scroll compressor according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed scroll 2 Orbiting scroll 6 Frame 8 Sealed housing 40 Intermediate pressure chamber 42 High pressure chamber 43 Low pressure chamber 44 High pressure side 45 Low pressure side 31 Discharge cover 35, 37 Shielding member 36, 38 Space

Claims (1)

(57) [Claims] 1. A discharge cover for partitioning the inside of a sealed housing into a high pressure side and a low pressure side, wherein a fixed scroll and a revolving scroll are meshed and housed on the low pressure side, and the fixed scroll is fixed in the sealed housing. It emerged rotatably supported to the installation frame, successively the high pressure chamber from the center toward the radial direction between the back and the discharge cover of the fixed scroll, an intermediate-pressure chamber, the orbiting scroll to form a low-pressure chamber thereof The above low pressure is achieved by revolving orbiting while preventing rotation.
The fixed scroll and the orbit through the low pressure chamber from the side
The complex formed by meshing with the scroll
Compresses gas inhaled into several enclosed spaces,
Is discharged from the high-pressure chamber through the high-pressure side.
Sometimes the gas under compression in the closed space is transferred to the intermediate pressure chamber.
The scroll compressor to be introduced, and on the said surface by disposing a shielding member covering the surface of the low-pressure chamber side of the discharge cover at a predetermined distance
A scroll compressor wherein a space in which gas is stagnated or sealed is formed between the scroll member and the shielding member .