JP3026672B2 - 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 in which an orbiting scroll is turned with respect to a fixed scroll to perform compression.

[0002]

2. Description of the Related Art A conventional scroll compressor is constructed as shown in, for example, Japanese Patent Application Laid-Open No. 3-237283. Here, a conventional example will be described with reference to this publication.
In FIG. 4, reference numeral 50 denotes an airtight container having an oil reservoir 51 at the bottom, in which a compression element 52 is disposed on the upper side and a frame 54 for isolating the electric element 53 is disposed on the lower side. The center of the frame is formed integrally with the main bearing 55, and supports the rotating shaft 56 of the electric element 53.
The compression element 52 includes a fixed scroll 57 and an orbiting scroll 5
8 is provided. The fixed scroll 57 includes a head plate 59,
The oscillating scroll 58 is formed by a head plate 61 and a wrap 62 erected on the head plate.

Further, the fixed scroll 57 and the orbiting scroll 58 form a plurality of compression spaces 63 by engaging the wraps 60 and 62 with each other. The fixed scroll 57 is fixed to the frame 54, and the orbiting scroll 58 is turned by the eccentric pin 64 of the rotating shaft 56, but an Oldham coupling 65 that revolves without rotating the orbiting scroll 58 with respect to the fixed scroll 57 is used. ing. 6
Reference numeral 6 denotes a balance weight fixed to a swing link 67 that fits an eccentric pin 64 of a rotary shaft 56 to change the orbital radius of the orbiting scroll 58. The balance weight rotates in a space 68 surrounded by the frame 54. are doing.

[0004] Reference numeral 69 denotes a suction pipe, which is a closed vessel 5.
0, the hollow portion 70 between the frame 54 and the electric element 53
It is open to. Reference numeral 71 denotes a suction passage provided in the fixed scroll 57 and the frame 54. Reference numeral 72 denotes a discharge hole provided at the center of the end plate 59 of the fixed scroll 57, and this discharge hole communicates with a high-pressure space 73 formed by the closed container 50 and the fixed scroll 57. 74 is a closed container 50
Is a discharge pipe which is attached to the upper wall and opens to the high-pressure space 73.

In the scroll compressor having this structure, the rotating shaft 5
The centrifugal force of the orbiting scroll 58 is canceled by the balance weight fixed to the swing link 67 into which the eccentric pin 64 of 6 is inserted to suppress the vibration of the compression element 52 and the swing link 67 reduces the orbital radius of the orbiting scroll 58. I can change it.

[0006]

However, since the swing link 67 has the balance weight 66 fixed to the outer periphery by shrink fitting, the inner diameter of the portion to which the balance weight is attached is reduced, and the swing link 67 and the eccentric pin 64 of the rotary shaft 56 are connected to each other. There was a problem that the fitting dimension of the eccentric pin became narrow and was fixed to the eccentric pin.

The present invention solves the above problems,
It is an object of the present invention to provide a scroll compressor in which the inner diameter of a swing link in a portion where a balance weight is fixed to shrink is increased.

[0008]

SUMMARY OF THE INVENTION The present invention comprises a scroll compression element housed in a closed container, an electric element, and a rotary shaft for transmitting the torque of the electric element to the scroll compression element. A fixed scroll in which a spiral wrap is erected on the end plate, an orbiting scroll in which a helical wrap is erected on one surface of the end plate and a boss is projected on the other surface, and A swing link that is fitted in a boss hole provided in the boss, and that automatically adjusts the orbiting scroll by fitting an eccentric pin of the rotating shaft, and a balance weight fixed to the outer periphery of the swing link by shrink fitting. A joint means for revolving the orbiting scroll without rotating with respect to the fixed scroll, and a swing to which the balance weight is attached The inner diameter of the tank is obtained formed larger than the outer diameter of the eccentric pin of the rotating shaft.

[0009]

According to the present invention, as described above,
The inner diameter of the swing link at the portion where the balance weight is attached is larger than the outer diameter of the eccentric pin, and when the balance weight is fixed to the swing link by shrink fitting, the inner diameter of the swing link is reduced by bulging inward. Is also prevented from sticking to the eccentric pin.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a sectional view of a scroll compressor according to an embodiment of the present invention. FIG. 2 is an enlarged sectional view of a main part showing a state where a balance weight is attached to the swing link of the present invention. FIG. 3 is an exploded cross-sectional view of the orbiting scroll, the swing link, and the rotating shaft according to the present invention.

Reference numeral 1 denotes a sealed container having an oil reservoir 2 at the bottom, and a frame 4 having a bearing 3 at the center in the container.
The scroll compression element 5 disposed on the upper side of the frame, the electric element 6 disposed on the lower side, and the rotational force of the electric element 6 that is supported by the bearing 3 of the frame 4 and transmitted to the scroll compression element 3. The rotating shaft 7 is housed.

The scroll compression element 5 is a fixed scroll 8
And an orbiting scroll 9. The fixed scroll 8 is in pressure contact with the inner wall of the closed container 1 to partition the container into a high-pressure chamber 10 and a low-pressure chamber 11, A spiral wrap 14 formed of an involute shape or a curve similar to the involute shape and erected on the end plate 12 surrounded by the annular wall.
It is composed of The fixed scroll 8 has a downward projecting direction of the annular wall 13 and the wrap 14.

The orbiting scroll 9 has a disk-shaped end plate 15,
A spiral wrap 16 composed of an involute or an approximate curve standing on one surface of the end plate;
A boss 17 protrudes from the center of the other surface of the end plate 15. And the orbiting scroll 9 is a wrap 16
This wrap is engaged with the wrap 14 of the fixed scroll 8 with the projecting direction of
8 are formed. The boss 17 is provided with a boss hole 20 into which the eccentric pin 19 of the rotating shaft 7 is inserted.

The end plate 14 of the fixed scroll 8 is provided at the center thereof with a discharge hole 21 communicating with the compression space 18. 2
Reference numeral 2 denotes a discharge valve that opens and closes the discharge hole 21 appropriately.

Reference numeral 23 denotes a rotary shaft 7 inserted into the boss hole 20.
Slidably mounted on the eccentric pin 19 of the orbiting scroll 9
A cylindrical swing link for adjusting the amount of eccentricity, and a balance weight 2 on the outer periphery of the swing link for canceling the unbalance force generated by the orbiting scroll 9 below the boss 17.
4 is fixed with shrink fit.

The swing link 23 is a balance weight 2
The inner diameter of the portion to which the rotary shaft 4 is attached is formed larger than the other inner diameters and sufficiently larger than the outer diameter of the eccentric pin 19 of the rotating shaft 7.

Reference numeral 25 denotes a joint means for revolving on the circular orbit without rotating the orbiting scroll 9 with respect to the fixed scroll 8. This joint means is an Oldham disposed between the frame 4 and the orbiting scroll 9. It is formed with joints.

Reference numeral 26 denotes a suction pipe attached to the closed vessel 1, and this suction pipe communicates with the low pressure chamber 11 in the closed vessel 1. 27 is a suction passage formed in the frame 4 for guiding the refrigerant in the low-pressure chamber 11 to the scroll compression element 5. Reference numeral 28 denotes a discharge pipe attached to the upper wall of the closed vessel 1, and the discharge pipe communicates with the high-pressure chamber 10 in the closed vessel 1.

In the scroll compressor configured as described above, when the electric element 6 is rotated, the rotational force is transmitted to the orbiting scroll 9 via the rotating shaft 7. That is, the orbiting scroll 9 is driven by the eccentric pin 19 of the rotary shaft 7 being inserted into the boss hole 20 of the boss 17 and driven by the joint means 2.
At 5, the fixed scroll 8 is revolved on a circular orbit without rotating. The fixed scroll 8 and the orbiting scroll 9 gradually reduce the compression space 18 formed by these scrolls from the outside to the inside, and flow into the low-pressure chamber 11 from the suction pipe 26 to suck the frame 4. Passage 2
The refrigerant flowing from 7 to the scroll compression element 5 is compressed. The compressed refrigerant is supplied to the end plate 12 of the fixed scroll 8.
The discharge valve 22 is opened from the discharge hole 21 provided in the container and discharged to the high-pressure chamber 10.

The swing link 23 is a balance weight 2
By making the inner diameter of the shrink fit portion 4 larger than the outer diameter of the eccentric pin 19 of the rotating shaft 7, the inner diameter does not become smaller than the outer diameter of the eccentric pin 19 when the balance weight 24 is fixed by shrink fitting. It is prevented from being fixed to the eccentric pin.

Swing link 23 and balance weight 2
4 and the fixed scroll 8.
The assembling accuracy can be improved even if the processing accuracy of the laps 14 and 16 of the orbiting scroll 9 varies.

[0023]

As described above, according to the present invention, the scroll compression element housed in the closed container, the electric element,
A rotary shaft for transmitting the rotational force of the electric element to the scroll compression element. The scroll compression element is provided with a fixed scroll for erecting a spiral wrap on the head plate and a spiral wrap on one surface of the head plate. And an oscillating scroll for projecting a boss on the other surface. The oscillating scroll is fitted in a boss hole provided in the boss of the orbiting scroll, and the eccentric pin of the rotary shaft is fitted to automatically rotate the orbiting scroll. A swing link for centering, a balance weight fixed to the outer periphery of the swing link by shrink fitting, and joint means for revolving the orbiting scroll without rotating with respect to the fixed scroll, and mounting the balance weight The inner diameter of the swing link is larger than the outer diameter of the eccentric pin of the rotating shaft. Even if this swing link bulges inward when fixed with a shrink, the inner diameter is prevented from becoming smaller than the outer diameter of the eccentric pin, so that the swing link can be prevented from sticking to the eccentric pin, and a balance weight is attached to the swing link. Even if the shrink fit is fixed, the automatic alignment function of the swing link can be prevented from being impaired.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of a main part showing a state where a balance weight is attached to the swing link of the present invention.

FIG. 3 is an exploded sectional view of an orbiting scroll, a swing link, and a rotation shaft according to the present invention.

FIG. 4 is a cross-sectional view of a conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 5 Scroll compression element 6 Electric element 7 Rotating shaft 8 Fixed scroll 9 Oscillating scroll 12,15 End plate 14,16 Lapping 17 Boss 19 Eccentric pin 20 Boss hole 23 Swing link 24 Balance weight 25 Joint means

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

Claims (1)

(57) [Claims] 1. A scroll compression element housed in a closed container, an electric element, and a rotation shaft for transmitting a rotational force of the electric element to the scroll compression element, wherein the scroll compression element is formed on a head plate by a spiral wrap. And a swinging scroll in which a spiral wrap is erected on one surface of the end plate and a boss is projected on the other surface, and fitted into a boss hole provided in the boss of the swinging scroll. A swing link that is fitted and an eccentric pin of the rotating shaft is fitted to automatically align the orbiting scroll, a balance weight fixed to the outer periphery of the swing link by shrink fitting, and the orbiting scroll is fixed to the fixed scroll. In contrast, in a scroll compressor comprising a joint means for revolving without rotating, the swing link has a balance weight. A scroll compressor wherein the inner diameter of the shrink fit portion is formed larger than the outer diameter of the eccentric pin of the rotating shaft.