JP3101441B2 - 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 for rotating both scrolls in the same direction for compression.

[0002]

2. Description of the Related Art A conventional scroll compressor is constructed as shown in, for example, Japanese Patent Publication No. 1-35196. Here, a conventional example will be described with reference to this publication. In FIG. 3, the conventional example shown in FIG. 3 includes a housing 50, a discharge chamber 51, a first scroll 52 which is a driving scroll housed inside the housing 50, and a second scroll which is a driven scroll. 53,
Rotary shaft 5 which is a drive shaft integral with first scroll 52
4. A rotating shaft 55, which is a driven shaft integrated with the second scroll 53, an electric motor 56, which is a driving source of the first and second scrolls 52, 53, A sealed space 61 formed between the inner walls 60 of the first housing member 59 opposed thereto, and a sliding ring 62 between the end plate 63 of the second scroll 53 and the inner wall 65 of the second housing 64 opposed thereto. It has a formed sealed space 66 and a lubrication system.

As shown in FIG. 3, a housing 50 is configured by combining first and second housing members 59 and 64. A gas suction port 67 is formed on the side of the second housing 64, and an end cover 70 having an oil supply hole 69 is attached to an end of the cylinder 68.

As shown in FIG. 3, the discharge chamber 51 is connected to a first housing member 59, and a gas outlet 71 is formed at a side of the discharge chamber 51. An end cover 73 is attached to the end of the cover.

[0005] The first scroll 52 has a head plate 58 and a wrap 74. On the other hand, the second scroll 53 includes the end plate 63, the wrap 75, and the peripheral portion 7 provided on the end plate 63.
6. The end plate 58 of the first scroll 52 has a flange 77 provided on the peripheral edge 76 so as to face the outer edge. In the second scroll 53, a compression space 78 is provided inside a peripheral portion 76, and a gas inlet 7 is provided in the peripheral portion 76.
9 are provided. The wraps 74 and 75 are formed in a spiral shape consisting of an involute or a similar curve, and are engaged with each other. End plates 58, 63
Are provided with gas holes 80 and 81 for introducing gas pressure from the compression space 78 into the sealed spaces 61 and 66. Further, an Oldham coupling 82 is incorporated between the end plate 58 of the first scroll 52 and the flange 77 of the second scroll 53, and the second scroll 53 is moved as the first scroll 52 is driven. Driven in the same direction, and the second scroll 5
3 is drivingly connected so as not to rotate.

The rotation axis 54 of the first scroll 52 and the second
The center O and the center P of the scroll 53 are eccentrically attached to each other at an interval ε from each other. A wrap 7 is provided on a half portion of the rotary shaft 54 of the first scroll 52 on the end plate 58 side.
A discharge port 83 for a gas is provided which communicates with the discharge chamber 51 from a compression space 78 formed between the discharge spaces 4 and 75.
The rotating shaft 54 of the first scroll 52 is supported by a bearing 84 provided on a boss of the first housing member 59 and a bearing 85 provided in the cylindrical portion 72 of the discharge chamber 51, and is provided in an axial direction. It can rotate at a fixed position, and is directly connected to the electric motor 56.

In the scroll compressor having this structure, the first
By rotating the second scrolls 52 and 53 in the same direction, the refrigerant is compressed in the compression space 78, and the first and second scrolls 5 and 53 are compressed.
Vibrations during the compression operation of 2, 53 are reduced, so that the scroll compressor can be used for high speed.

[0008]

However, in the conventional scroll compressor, the first scroll 52 and the second scroll 53 rotate inside the housing 50, and when oil accumulates in the housing 50, this oil There was a problem that the scroll input increased during operation due to the sliding resistance due to the viscosity of the scroll.

The present invention solves the above problems,
Provided is a scroll compressor in which high-pressure gas refrigerant is mixed into oil accumulated in a hollow chamber in which a scroll rotates to reduce the viscosity of the oil so that the input does not increase due to sliding resistance due to the oil during operation of the scroll. It is intended for that purpose.

[0010]

According to the present invention, a motor-driven element and a scroll compression element are housed in a closed container, and the scroll compression element is connected to the motor-driven element by erecting a spiral wrap on a head plate. A first scroll having an axis;
An axis eccentric to the center of the axis of the first scroll,
A second scroll in which a spiral wrap is erected on a head plate facing and meshing with the first scroll; a main frame having a main bearing for supporting a shaft of the first scroll; An auxiliary frame having an auxiliary bearing for supporting the axis of the scroll; and a plurality of compressions formed by a first scroll and a second scroll housed in a hollow chamber formed inside the auxiliary frame and the main frame. An Oldham coupling that swings these scrolls in the same direction so as to compress the space by gradually reducing the space from the outside to the inside, and fixing both of the scrolls to one of the scrolls and the other A scroll compressor configured to control the axial movement of the scroll and discharge the refrigerant compressed in the compression space into a closed container. It is a hollow chamber and sealed containers to be accommodated between the first scroll and a second scroll that communicates with passage provided in the frame.

Further, in the present invention, a passage connecting the inside of the closed container and the hollow chamber is opened to the lower side of the hollow chamber.

[0012]

According to the present invention, as described above,
High pressure gas refrigerant is mixed into the oil stored in the hollow chamber surrounded by the main frame and the auxiliary frame to reduce the viscosity of this oil, reduce the sliding resistance due to the oil, and increase the input during scroll operation. Is reduced.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a longitudinal sectional view of a scroll compressor showing one embodiment of the present invention.

Reference numeral 1 denotes a closed container, in which an electric element 2 is accommodated on the upper side and a scroll compression element 3 is accommodated on the lower side. The electric element 2 includes a stator 4 and a rotor 5 disposed inside the stator. An air gap 6 is formed between the stator 4 and the rotor 5.

Reference numeral 7 denotes a main frame, on which a main bearing 8 is provided at the center. Reference numeral 9 denotes an auxiliary frame which is attached to the inner wall of the closed casing 1 by press contact.
Is provided. The main frame 7 and the auxiliary frame 9 are fixed with bolts 12 so as to form a hollow chamber 11 therein.

The scroll compression element 3 comprises a first scroll 13 driven by the electric element 2 and a second scroll 14 which rotates in the same direction as the first scroll. The first scroll 13 has a disk-shaped end plate 15, a spiral wrap 16 composed of an involute-shaped curve erected on one surface of the end plate, and a head plate 1.
And a drive shaft 17 that is inserted into and fixed to the rotor 5 so as to project from the center of the other surface of the rotor 5. The first scroll 13 constitutes a driving scroll. Second
The scroll 14 has a disk-shaped end plate 18, a spiral wrap 19 formed of an involute-shaped curve erected on one surface of the end plate, and a driven shaft protruding from the center of the other surface of the end plate 18. 20. And the second
Scroll 14 constitutes a driven scroll.

The first scroll 13 has a drive shaft 17 supported by a main bearing 8 of the main frame 7 and a second scroll 14.
The driven shaft 20 is supported by the auxiliary bearing 10 of the auxiliary frame 9, and the wraps 16, 19 of the scrolls 13, 14 are engaged with each other in the hollow chamber 11 so as to face each other. It is formed.

The drive shaft 17 is provided with a discharge hole 23 for discharging the refrigerant compressed in the compression space 21 into the upper space 22 of the electric element 2 in the closed casing 1.

Reference numeral 24 denotes a regulating member that regulates the axial movement of the second scroll 14. The regulating member contacts the end plate 18 of the second scroll 14 and contacts the first scroll 13 via the cylindrical ring 25. It is fixed with bolts 26.
A space 27 is formed inside the regulating member 24, the cylindrical ring 25 and the first scroll 13 so as to cover the second scroll 14. A ball bearing 28 is disposed between the regulating member 24 and the outer periphery of the auxiliary bearing 10 of the auxiliary frame 9.

Reference numeral 29 denotes a regulating member 24 and the second scroll 1
And an Oldham joint provided between the second scroll 14 and the second scroll 14 while rotating the regulating member 24 and the second scroll 14 integrally fixed to the first scroll 13 in the same direction. It is configured to swing relatively to the first scroll 13.

Reference numeral 30 denotes a driven shaft 20 of the second scroll 14.
A positioning member integrally having an eccentric bush 31 fitted between the auxiliary bearing 10 of the auxiliary frame 9 and
The positioning member is provided with a recess 33 communicating with the space 27 via a suction passage 32 provided at the center of the driven shaft 20 of the second scroll 14. Positioning member 3
A suction pipe 34 communicating with the inside of the recess 33 is inserted and connected to 0. Then, the regulating member 24, the first scroll 1
A space 27 surrounded by 3 and the cylindrical ring 25 is formed in a low-pressure chamber.

Reference numeral 35 denotes the regulating member 24 and the second scroll 1
The seal ring is provided on the sliding surface between the end plate 18 of FIG. 4 and the seal ring and blocks the space 27 forming the low-pressure chamber and the hollow chamber 11.

The main bearing 8 and the positioning member 30 of the main frame 7 are provided with lubrication holes 36 and 37 for lubricating the sliding surfaces of the drive shaft 17 and the driven shaft 20.

The main frame 7 and the auxiliary frame 9 are provided with a discharge hole 38 for discharging oil collected in the hollow chamber 11 to an upper portion of the main frame. This discharge hole communicates with the oil reservoir 39 of the main frame 7. The oil reservoir communicates with an oil supply hole 36 of the main frame 7.

Reference numeral 40 denotes a pipe mounted on the outer wall of the closed casing 1. The pipe has an upper end in the high-pressure space 41 between the electric element 2 and the scroll compression element 3, and a lower end formed in the auxiliary frame 9. 42. This passage opens upward below the ball bearing 28 and below the hollow chamber 11.

Reference numeral 43 denotes a discharge pipe, which is a closed vessel 1
It is provided on the upper part.

In the scroll compressor configured as described above, when the electric element 2 is rotated, the rotational force is transmitted to the first scroll 13 via the drive shaft 17. The rotational force transmitted to the first scroll is transmitted to the second scroll 14 via the Oldham coupling 29 from the regulating member 24 that regulates the axial movement of the second scroll 14, and the second scroll 14 While rotating in the same direction as the first scroll 13, it is relatively swung. The second scroll 14 rotates at a position where the center of the driven shaft 20 is eccentric with respect to the center of the drive shaft 17 of the first scroll 13. Therefore, the first scroll 1
The third and second scrolls 14 gradually reduce the compression space 21 formed by these scrolls from the outside to the inside, and remove the refrigerant flowing from the suction pipe 34 into the recess 33 of the positioning member 30. The air is guided to the space 27 via the suction passage 32 of the driven shaft 20 and flows into the outer compression space 21 for compression. The compressed refrigerant is discharged from the discharge hole 23 provided in the drive shaft 17 of the first scroll 13 into the upper space 22 and discharged from the discharge pipe 43 to the outside of the closed container 1.

The seal ring 35 provided on the sliding surface between the regulating member 24 and the second scroll 14 is
To prevent the refrigerant, oil and the like in the hollow chamber from leaking into the space 27 forming the low-pressure chamber.

The eccentric bush 31 of the positioning member 30 is fitted between the auxiliary bearing 10 and the driven shaft 20 so that the eccentric bush 31 is engaged with the wrap 16 of the first scroll 13 and the wrap 19 of the second scroll 14. It is possible to adjust the clearance properly. The positioning member 30 is slightly shifted in the rotational direction by the eccentric bush 31 so that the suction pipe 34 can be inserted and connected to the recess 33.

The sliding surface between the drive shaft 17 and the driven shaft 20 is provided on the oil supply hole 3 provided in the main frame 7 and the positioning member 30.
Lubricated with oil supplied from 6,37. The oil that has lubricated the sliding surface between the drive shaft 17 and the driven shaft 20 and accumulated in the hollow chamber 11 is discharged from the discharge hole 38 by the rotation of the first scroll 13, the regulating member 24 and the cylindrical ring 25 through the main frame 7. And is stored in the oil storage section 39. The oil stored in the oil storage portion is supplied to the sliding surface of the drive shaft 17 from the oil supply hole 36 and circulates.

The high-pressure refrigerant compressed in the compression space 21 and discharged into the upper space 22 from the discharge hole 23 is supplied from the high-pressure space 41 to the pipe 40 by the oil stored in the hollow chamber 11.
And is supplied to the passage 42 of the auxiliary frame 9 through the passage 42, and is mixed in from the passage 42 opened upward below the ball bearing 28. Then, the oil is foamed by the mixed high-pressure refrigerant, and the viscosity of the oil decreases. For this reason, the oil accumulated in the hollow chamber 11 is consumed by the scroll compression element 3 during operation.
So that the sliding resistance does not occur.

FIG. 2 is a longitudinal sectional view of a scroll compressor showing another embodiment.

According to another embodiment of the present invention, the condenser 4
4. A pipe 47 branched from a discharge pipe 43 connected to a refrigeration circuit such as a decompression device 45 or an evaporator 46 may be connected to the passage 42 of the auxiliary frame 9. According to this embodiment,
The high-pressure refrigerant from which oil has been separated in the closed vessel 1 is supplied to the hollow chamber 1.
1 can be mixed into the oil, and the oil in the hollow chamber can be made more foamy.

[0035]

As described above, according to the present invention, the hollow chamber formed by the main frame and the auxiliary frame and accommodating the first scroll and the second scroll communicates with the high-pressure space in the sealed container. The passage that opens is formed below the hollow chamber, so that high-pressure refrigerant can be mixed into the oil that accumulates in the hollow chamber to reduce the viscosity of the oil, reduce friction loss due to oil, and reduce the rotation of the scroll. The accompanying input can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a scroll compressor showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a scroll compressor showing another embodiment of the present invention.

FIG. 3 is a sectional view of a conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Electric element 3 Scroll compression element 7 Main frame 8 Main bearing 9 Auxiliary frame 10 Auxiliary bearing 11 Hollow chamber 13 First scroll 14 Second scroll 15, 18 End plate 16, 19 Lapping 17 Drive shaft 20 Follower shaft 21 Compression space 24 regulating member 29 Oldham coupling 40 pipe 41 high-pressure space 42 passage

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F04C 18/02 311

Claims (2)

(57) [Claims] An electric element and a scroll compression element are housed in an airtight container, and the scroll compression element has a shaft connected to the electric element by arranging a spiral wrap on a head plate. A second scroll having an axis eccentric to the center of the axis of the first scroll, and a spiral wrap standing upright on a mirror plate facing and engaging with the first scroll; A main frame having a main bearing for supporting the scroll shaft, an auxiliary frame having an auxiliary bearing for supporting the second scroll shaft, and housed in a hollow chamber formed by the auxiliary frame and the main frame. Then, the plurality of compression spaces formed by the first scroll and the second scroll are gradually reduced from the outside to the inside, and these scrolls are moved in the same direction so as to perform compression. An Oldham coupling that swings while rotating, and a regulating member that is fixed to one of the scrolls and regulates the movement of the other scroll in the axial direction, wherein the refrigerant compressed in the compression space is In the scroll compressor discharged into a closed container, the hollow chamber in which the first scroll and the second scroll are stored and the inside of the closed container are communicated with each other through a passage provided in the frame. And scroll compressor. 2. The scroll compressor according to claim 1, wherein a passage communicating between the inside of the closed vessel and the hollow chamber is opened below the hollow chamber.