JP2002031069A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor capable of enhancing the sealing performance of a gas compressing chamber formed between a stationary scroll and a movable scroll. SOLUTION: The scroll compressor 10 includes a stationary scroll 20 and a movable scroll 42, wherein a groove 76 is formed along the spiral end face 70 of the stationary scroll 20, and a seal member 78 is fitted in the groove 76. Another groove 86 is formed in the spiral end face 81 of the movable scroll 42, and a seal member 90 is fitted in this groove 86. The spiral end face 70 of the stationary scroll 20 is put in slide contact with a base board 64 on the side with movable scroll 42 with the seal member 78 interposed, while the spiral end face 81 of the movable scroll 42 is in contact with a base board 62 on the side with stationary scroll 20 with the seal member 90 interposed. A slope face 80 is formed in the central part 74 of the spiral end face 70 of the stationary scroll 20, and the tip of the seal member 78 confronts with the slope face 80.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll type compressor, and more particularly, to a scroll type compressor for compressing a fluid by relatively rotating a fixed scroll and a movable scroll. The present invention also relates to a scroll compressor in which a seal member is provided on a spiral end face of the fixed scroll or the movable scroll.

[0002]

2. Description of the Related Art In a scroll compressor, a spiral type movable scroll is engaged with a spiral type fixed scroll, and the movable scroll is rotated by an eccentric pin. A structure is adopted in which the space for compressing the fluid is gradually moved from the outer peripheral part to the central part. that time,
The fluid in the space at the outer peripheral portion of the fixed scroll and the movable scroll is in a low pressure and low temperature state, while the fluid in the space at the central portion is in a high pressure and high temperature state. Due to this high temperature state, the sliding resistance between the fixed scroll and the movable scroll becomes larger in the central portion than in the outer peripheral portion, and moreover, receives a larger fluid pressure. For this reason, there is a concern that seizure or breakage may occur at the central portion of both scroll members.

In order to overcome this inconvenience, Japanese Utility Model Publication No.
According to the invention "connection structure of scroll member in scroll compressor" according to JP-A-43423, at least one of the movable scroll and the fixed scroll at the spiral center end surface is made lower than the remaining end surface. Forming a gap between the substrate of the other scroll member and the center end face, even if the center end face extends in the height direction due to thermal expansion, the gap sufficiently allows it; As a result, a scroll compressor that suppresses an increase in sliding resistance has been proposed.

[0004]

However, according to this structure, the center portion of one of the spiral portions is cut off so as to be lower than the other end surface to provide the gap. Sealing performance is deteriorated.
As a result, in the scroll type compressor, a disadvantage that a desired compressed fluid cannot be obtained at the central portion between the fixed scroll and the movable scroll is exposed.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-described disadvantages. In a scroll compressor including a fixed scroll and a movable scroll, an inclined surface is provided near a central end surface of one of the scroll members. The seal member is extended to the inclined surface to enhance the sealing effect of the central portion of the spiral scroll member in combination with the flexibility of the seal member, and the seizure caused by the sliding resistance due to high temperature. It is an object of the present invention to provide a scroll compressor capable of avoiding breakage and the like.

[0006]

In order to achieve the above object, a scroll type compressor according to the present invention rotates a movable scroll with respect to a fixed scroll so as to form an image between the fixed scroll and the movable scroll. In a scroll compressor that compresses a fluid in a fluid chamber formed, the scroll compressor includes a rotating shaft connected to a driving source,
A fixed member having a support provided on the rotating shaft, a pin provided on the support eccentric to an axis of the rotating shaft, and a revolving bush provided on the movable scroll and through which the pin is inserted. A first seal member in contact with the movable scroll substrate is provided on a spiral end surface of the scroll, and a second seal member in contact with the fixed scroll substrate is provided on the spiral end surface of the movable scroll; An inclined surface is provided at an end surface of the spiral central portion of the movable scroll, and one of the first and second seal members is extended to the inclined surface.

As a result of the above construction, the seal member is always in contact with the end surface of the spiral scroll member of the fixed scroll or the movable scroll from the outer peripheral portion to the central portion of the substrate surface of the other scroll member. Therefore, a sealing effect can be obtained at least at any of the substrate and the spiral end surface of the scroll member, and as a result, a desired compressed fluid can be obtained at the central portion. For this reason, seizure and breakage of the scroll member can be avoided, and a refrigerant system such as an air conditioner or a refrigerator can be efficiently operated using the compressed fluid.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a scroll compressor according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a scroll compressor 10 according to the present embodiment. The scroll compressor 10 has a front housing 12 and a rear housing 14,
A chamber 16 is defined between the front housing 12 and the rear housing 14. A fixed scroll 20 is fixed to the rear housing 14 side via a bolt 18, while a bolt 22 is inserted from the front housing 12 side, and a tip end thereof is screwed into an end face of the fixed scroll 20. Then, the rotating shaft 24 is inserted into the chamber 16 through the opening at the reduced diameter end of the front housing 12.

The rotating shaft 24 is rotatably supported by a first bearing 32 and a second bearing 26.
At one end, there is a support 28 with an enlarged diameter. A support surface 30 of the support 28 is rotatably supported by a first bearing 32. As easily understood from FIG. 1, the front housing 12 has a shoulder 34, and the first bearing 32 is supported by the shoulder 34. A pin 36 is fixed to the support 28 eccentrically to its axis,
A balance weight 4 is provided at the base of the pin 36.
0 is attached. The turning bush 44 of the movable scroll 42 is engaged with the pin 36.

Specifically, the movable scroll 42 has a recess 4
6, and the swivel bush 44 is held in the recess 46 via a swivel bearing 48. The turning bush 44 is formed with a hole 50 eccentric to its axis.
The pin 36 comes into contact with. An annular groove 52 is formed at the tip of the pin 36, and a C-shaped stop ring 54 is formed in the annular groove 52.
Are fitted. Accordingly, the pin 36 is configured such that the C-shaped stopper ring 54 fitted in the annular groove 52 prevents the pin 36 from moving in the axial direction facing the swivel bush 44. An electromagnetic clutch 56 is provided in the vicinity of the second bearing 26. The on / off operation of the electromagnetic clutch 56 causes the transmission or disconnection of a rotational force from a rotary drive source such as an engine (not shown) to the rotary shaft 24. Done.

Here, reference numeral 58 denotes a fixed scroll 2.
Reference numeral 60 denotes a compressed gas outlet formed on the 0 side.
Denotes a gas compression chamber defined between the fixed scroll 20 and the movable scroll 42. Further, reference numeral 62
Indicates a substrate on the fixed scroll 20 side, and reference numeral 64 indicates a substrate on the movable scroll 42 side. In fact, the compressed gas outlet 58 is connected to the substrate 62 on the fixed scroll 20 side.
Will be easily understood from FIG.

Next, the end surfaces of the fixed scroll 20 and the movable scroll 42 will be described.

FIG. 2 schematically shows a spiral end face of the fixed scroll 20, and FIG. 3 shows a spiral end face of the movable scroll 42. Spiral end face 7 of fixed scroll 20
At 0, a groove 76 having a predetermined depth is formed along the spiral shape from the outer peripheral portion 72 to the central portion 74. Then, a seal member 78 made of PPS, carbon fiber, and solid lubricant is fitted into the spiral groove 76. In this case, the distal end of the central portion 74 of the fixed scroll 20 is formed as an inclined surface 80 as shown in FIG. 4. Therefore, the portion corresponding to the inclined surface 80 of the spirally wound seal member 78 is: The amount exposed to the outside from the groove 76 is larger than other portions.

The length orthogonal to the axis of the inclined surface 80 is 3 mm to 20 mm, and the maximum length along the axis of the end face at the center of the inclined surface is 20 μm to 100 μm.

On the other hand, on the movable scroll 42 side, a spiral groove 86 is formed from the outer peripheral portion 82 of the spiral end face 81 to the central portion 84, and this groove 86 is a portion 88 slightly retreated from the central portion 84. Terminate. The seal member 90 is fitted into the groove 86 in the same manner as the fixed scroll 20. The material of the seal member 90 is the same as that of the seal member 7.
8 and is made of PPS, carbon fiber and solid lubricant.

As described above, since the spiral groove 86 terminates at the portion 88 retreated from the central portion 84, the sealing member 9 is formed.
0 is merely fitted up to the withdrawn portion 88. The reason why the structure in which the seal member 90 reaches the retreated portion 88 is that the seal member 90 extends to the end of the central portion 84.
Is extended, the seal member 90 faces the compressed gas outlet port 58, so that not only the sealing effect cannot be obtained, but also the seal member 90
8 is damaged by the corners of the substrate 62 that defines 8. The inclined surface 80 similar to that of the fixed scroll 20 is not provided at the central portion 84 of the movable scroll 42 of the scroll compressor according to the present embodiment.

The operation and effect of the scroll compressor basically configured as described above will be described below.

When a rotational force is transmitted to the rotary shaft 24 under the urging action of the electromagnetic clutch 56, the support 28 rotates via the first bearing 32, and is thereby provided on the support 28. The pin 36 that has been rotated is
4 while rotating eccentrically with respect to the axis of 4. As a result, the orbiting bush 44 rotates and the orbiting scroll 42 similarly rotates, and the refrigerant gas is compressed in the gas compression chamber 60 defined between the fixed scroll 20 and the orbiting scroll 42, and the compressed gas outlet is formed. From 58, it is led to a refrigerant circulation system (not shown).

More specifically, the sealing member 90 of the movable scroll 42 is pressed against the substrate 62 on the fixed scroll 20 side to obtain a sealing effect. On the other hand, the seal member 78 of the fixed scroll 20 is
It contacts the substrate 64 on the second side. Therefore, the fixed scroll 20
A space defined between the movable scroll 42 and the movable scroll 42 is a substantially sealed space. Therefore, as described above, as the movable scroll 42 is rotated, the gas compression chamber 60 defined between the fixed scroll 20 and the movable scroll 42 gradually advances from the outer peripheral part to the central part. The compressed gas is led out of the gas compression chamber 60 to a refrigerant circulation system (not shown) via the compressed gas outlet 58.

At this time, according to the present embodiment, the seal member 78 extends with respect to the inclined surface 80 of the central portion 74 of the fixed scroll 20. Accordingly, even if the fixed scroll 20 or the movable scroll 42 expands thermally from the outer peripheral portion 82 to the central portions 74 and 84 with the temperature rise due to the gas compression action, first, the fixed scroll 20 or the movable No stress is generated in the spiral central portions 74 and 84 of the scroll 42 due to expansion due to thermal expansion, in other words, no reaction force is generated against the substrates 62 and 64.

By the way, considering the sealing property at the central portion 74 due to the presence of the inclined surface 80, according to the embodiment of the present invention, the sealing member 78 of the central portion 74 is provided.
Is present, the seal member 78 can sufficiently contact the substrate 64 on the movable scroll 42 side.
As a result, in the central portion 74, an unreasonable load is not applied, and the sealing performance can be sufficiently ensured.

Further, as described above, since the sealing member 78 is sufficiently exposed from the inclined surface 80 in the height direction, the lubricating oil introduced into the space defined by the fixed scroll 20 and the movable scroll 42 , Over a wide area. Therefore, lubricating oil can be sufficiently supplied to the seal member 78 and the spiral grooves 76 and 86, and the seal member 7
8 or the fixed scroll 20 and the movable scroll 42 can be increased in lubricity.

In this embodiment, each of the fixed scroll 20 and the movable scroll 42 has a spiral structure. However, for example, a scroll shown in FIG. Needless to say, the present invention can be applied to a scroll having a tapered central portion shown in FIG. Further, the inclined surface 80 is linear, but may be a curved inclined surface 92 as shown in FIG.

[0025]

As described above, according to the present invention, the inclined surface is provided at the spiral central portion of the fixed scroll, and the seal member 78 which contacts the movable scroll substrate including the inclined surface is extended. Have been Therefore, even if the fixed scroll and the movable scroll thermally expand with the temperature rise, the presence of the inclined surface at the central portion can reduce the stress or load on the root substrate. On the other hand, the sealing effect in the gas compression chamber formed between the fixed scroll and the orbiting scroll is further improved particularly by the sealing member exposed from the inclined surface at the central portion. Moreover, the lubricating oil introduced into the gas compression chamber comes into contact with the seal member over a larger area. Therefore, the lubricating oil can be efficiently brought into contact with the groove in which the seal member is fitted and the seal surface, and as a result, the effect of improving the sealing performance and increasing the durability is obtained.

In the above-described embodiment, the inclined surface is provided on the fixed scroll side. However, it is possible to provide an inclined surface at a central portion on the movable scroll side and allow the sealing member to face the inclined surface. Of course.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional explanatory view of a scroll compressor according to the present invention.

FIG. 2 is an explanatory front view of a fixed scroll incorporated in the scroll compressor shown in FIG. 1;

FIG. 3 is an explanatory front view of a movable scroll incorporated in the scroll compressor shown in FIG. 1;

FIG. 4 is a schematic side view illustrating a spiral central portion of the fixed scroll shown in FIG. 2;

FIG. 5 is a partially omitted perspective explanatory view of a structure in which a seal member is incorporated in a scroll having a central portion formed in a plurality of steps in another embodiment.

FIG. 6 is a partially omitted longitudinal sectional view of a structure in which a seal member is incorporated in a scroll having a tapered central portion in still another embodiment.

FIG. 7 is a schematic side view illustrating a spiral central portion of a scroll in still another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Scroll type compressor 12 ... Front housing 14 ... Rear housing 20 ... Fixed scroll 24 ... Rotating shaft 42 ... Movable scroll 44 ... Revolving bush 56 ... Electromagnetic clutch 76, 86 ... Groove 78, 90 ... Seal member 80 ... Inclined surface

Claims (1)

[Claims] 1. A scroll compressor for rotating a movable scroll with respect to a fixed scroll to compress a fluid in a fluid chamber defined between the fixed scroll and the movable scroll. A rotating shaft connected to a driving source; a support provided on the rotating shaft; a pin provided on the support eccentrically to an axis of the rotating shaft; and a pin provided on the movable scroll and inserted into the movable scroll. A first seal member that is provided on the spiral end surface of the fixed scroll and is in contact with the substrate of the movable scroll, and a second seal that is in contact with the substrate of the fixed scroll on the spiral end surface of the movable scroll. A sealing member, and an inclined surface is provided on an end surface of a spiral central portion of the fixed scroll or the movable scroll, 1 a scroll type compressor, characterized in that to extend to the inclined surface one of the second seal member.