JP2871321B2 - Scroll type fluid machine - 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 type fluid machine widely used as a refrigerant compressor for a refrigerator or an air conditioner.

[0002]

2. Description of the Related Art Conventionally, a fixed scroll F and a revolving scroll O are disposed inside a casing D via a housing H, as disclosed in Japanese Patent Laid-Open No. 1-105701 and shown in FIG. A housing E for housing a counterweight W provided at an end of the drive shaft K and a crank C having a swing link L is provided, and a support member is provided on a top surface of a housing H having an inner periphery facing the housing E. As shown in FIG. 7, an annular thrust bearing S having a support surface P for supporting the back surface of the orbiting scroll O and a plurality of radial grooves M opening in the support surface P is provided via the G. On the other hand, an oil supply passage T provided inside the drive shaft K is opened from the upper surface of the swing link L to the inside of the accommodation chamber E through a gap of the bearing B interposed in the swing link L, and the thrust bearing S Internal radial grooves M in allowed to flow into the oil,
Good thrust support of the orbiting scroll O can be performed by oil lubrication.

[0003]

However, in the above, the radiation groove M is formed as a single groove from the inner peripheral side to the outer peripheral side. Although the oil released into the chamber E can be taken into the radiation groove M satisfactorily, the amount of oil flowing from the outer outlet of the radiation groove M to the outer peripheral regions of the scrolls F and O increases.
The amount of oil flowing into the working chamber defined between the scrolls F and O increases, so that oil compression occurs and the amount of oil taken out together with the discharge fluid increases, so-called oil rising problem occurs. If the channel area of the groove M is reduced, oil cannot be sufficiently taken into the radiation groove M, causing poor lubrication and causing problems such as seizure.

A main object of the present invention is to provide a scroll type fluid machine which can perform good thrust support and reduce oil rise.

[0005]

Therefore, in order to achieve the above-mentioned main object, a pair of scrolls 1 and 2 are arranged inside a casing 10 via a housing 3 and a drive shaft 4 is mounted on the housing 3. A housing surface 6 for housing a crank portion 5 provided at an end portion is provided, and a support surface 80 for supporting a back surface of one scroll 2 is provided on a top surface portion of the housing 3 having an inner peripheral surface facing the housing room 6. An annular thrust bearing 8 having a large number of radial grooves 7 opening in the support surface 80 is provided, while an oil supply passage 9 provided inside the drive shaft 4 is provided.
In the scroll-type fluid machine in which is opened into the accommodation chamber 6, a radially inner groove portion of the radiation groove 7 is provided.
To the first oil groove 71, the radially outer groove portion of the radiation groove 7, which is continuous with the first oil groove 71 , is formed into a second oil groove 72 having a smaller flow area than the first oil groove 71. Each was formed.

[0006] In this case, the first oil groove 71 wide width groove 71b
The second oil groove 72 is formed by a narrow groove 72b having a width smaller than that of the wide groove 71b .

Further, in order to further reduce the amount of oil flowing out from the outer side outlet of the radiation groove 7, an annular recess 30 for receiving the thrust bearing 8 is further provided in the housing 3, and an outer peripheral wall portion of the annular recess 30 is provided. An annular groove 31 for opening the outer side outlet of the radiation groove 7; and an annular weir 32 standing upright on the outer side of the annular groove 31 and having substantially the same height as the support surface 80 of the thrust bearing 8. And provided.

[0008]

The inner first oil groove 71 facing the storage chamber 6 has a large flow passage area, so that the oil released into the storage chamber 6 can be taken into the radiation groove 7 satisfactorily. Outer second oil groove 72 in contact with the outer peripheral area of scrolls 1 and 2
Since the flow path area is small, the amount of oil flowing out from the radiation groove 7 can be reduced. In this way, the oil once flowing into the radial groove 7 is hard to flow out from the outlet, the effect of retaining the oil inside the radial groove 7 is improved, good lubrication can be performed, and the oil rising between the scrolls 1 and 2 rises. The amount can be reduced.

[0009] The first oil groove 71 in the wide width groove 71b, narrow groove 72b having a second oil groove 72 a width narrower than the wide groove 71b
Thus, the intended purpose can be easily achieved by changing the groove width of the radiation groove 7.

An annular recess 30 for receiving the thrust bearing 8
Is provided with an annular groove 31 for opening the outer side exit portion of the radiation groove 7 and an annular weir 32 standing upright on the outer side of the annular groove 31. The oil that flows outward is blocked by the annular weir portion 32 and hardly flows to the outer peripheral regions of the scrolls 1 and 2. In this case, the annular weir portion 32 is formed at substantially the same height as the support surface 80 of the thrust bearing 8. However, since the outer periphery of the scroll 2 received by the thrust bearing 8 rises due to bending deformation, the scroll 2 A contact accident does not occur between the back surface and the top surface of the annular weir 32, but rather, the annular weir 32 is positively made substantially the same height as the support surface 80 of the thrust bearing 8, so that the radiation groove 7 The gap between the annular groove 31 serving as the outlet of the scroll and the outer peripheral regions of the scrolls 1 and 2 can be minimized, and the amount of spilled oil can be effectively reduced.

[0011]

FIG. 3 shows a scroll-type fluid machine as a refrigerant compressor, in which a fixed scroll 1 and a revolving scroll 2 are placed above a sealed casing 10 via a housing 3 and below the casing. And a motor 40 directly connected to the drive shaft 4 is provided. The housing 3 is provided at the end of the drive shaft 4 with an accommodating chamber 6 for accommodating the crank portion 5 having an eccentric hole 51 into which the boss 21 protruding from the back surface of the revolving scroll 2 is fitted. An annular recess 30 is provided on the top surface of the housing 3 facing the inner peripheral edge of the housing chamber 6, and an annular thrust bearing 8 having a support surface 80 for supporting the back surface of the revolving scroll 2 is provided. I have. On the other hand, an oil supply passage 9 that carries oil pumped from an oil reservoir at the bottom via an oil pump is provided inside the drive shaft 4, and the oil supply passage 9 is provided in a bearing clearance of the upper main bearing 91 and the crank bearing 92. To the inside of the accommodation room 6 via the.

The low-pressure gas sucked into the casing 10 from the suction pipe 11 is taken into the working chamber 13 from the outer peripheral area 12 of each of the scrolls 1 and 2, and the compressed high-pressure gas is supplied to the center of the fixed scroll 1. Through a high-pressure chamber 16 defined by a partition wall 15 from a discharge port 14 provided at an outlet of the discharge pipe 17.

In the above configuration, as shown in FIG. 1, the thrust bearing 8 is provided with a large number of radial grooves 7 which are opened on the support surface 80. In the first oil groove 71 having a large flow area, the radially outer groove portion of the radial groove 7 which is continuous with the first oil groove 71 is provided with a second groove having a small flow area with respect to the first oil groove 71. Oil groove 7
2 respectively. Specifically, as clearly shown in FIG. 2, the first oil groove 71 is formed by a deep groove 71a having a large groove depth, and the second oil groove 72 is formed by a shallow groove 72a having a small groove depth.

In addition, an annular groove 31 for opening an outer outlet of the radiation groove 7 is formed on an outer peripheral wall of the annular recess 30 in the housing 3, and a thrust bearing is provided upright on the outer side of the annular groove 31. 8 and an annular weir 32 at the same height.

With the above structure, the first oil groove 71 on the inner side facing the storage chamber 6 is formed by the deep groove 71a, and the flow area of the first oil groove 71 is large. On the other hand, the outer second oil groove 72 in contact with the outer peripheral area 12 of the scrolls 1 and 2 is
Since it is formed by the shallow groove 72a and its flow path area is small, the amount of oil flowing out from the radiation groove 7 can be reduced.
In this way, the oil once flowing into the radiation groove 7 is difficult to flow out from the outlet, the effect of retaining the oil inside the radiation groove 7 is improved, good lubrication can be performed, and the scrolls 1, 2
It is possible to reduce the amount of oil lifted in the working chamber 13 during the operation.

Further, the oil which has flowed out of the radial groove 7 is blocked by the annular weir 32 located outside the annular groove 31, and the annular weir 32 is supported by the thrust bearing 8. Since the height is the same as that of the surface 80, as shown by the imaginary line in FIG. It is possible to minimize the gap between the end faces, and effectively reduce the amount of oil spilled, while avoiding the occurrence of a contact accident between them. In addition, since the annular weir 32 is flush with the thrust support surface 80, the annular weir 3
2 and the support surface 80 of the thrust bearing 8 can be cut at the same time.

By the way, in the above embodiment, the groove depth of the radiation groove 7 was changed. However, as shown in FIGS. 4 and 5, the groove width was changed, and the first oil groove 71 was replaced with the wide groove 71b. Second oil groove 7
2 may be formed by the narrow grooves 72b, respectively, and in this case, the same operation and effect as described above can be obtained.

[0018]

As described above, in the present invention, the radially inner portion of the radial groove 7 provided in the thrust bearing 8 is replaced with the first oil groove 71 having a large flow area by the deep groove 71a, the wide groove 71b, and the like. The radially outer portion is formed by the shallow groove 72a or the narrow groove 7a.
Since each of the second oil grooves 72 having a small flow passage area formed by 2b or the like is formed, the scroll 2 can be favorably supported in the thrust, and the amount of oil lifted up between the scrolls 1 and 2 can be reduced. Can be improved.

Further, an annular groove 31 for opening the outer side outlet of the radiation groove 7 is provided on the outer peripheral wall of the annular recess 30 of the housing 3 for receiving the thrust bearing 8, and is provided upright on the outer side thereof.
When the support surface 80 of the thrust bearing 8 and the annular weir portion 32 having substantially the same height are provided, the amount of oil flowing from the outlet of the radiation groove 7 to the outer peripheral regions of the scrolls 1 and 2 can be effectively reduced. In addition, the oil rise can be more favorably reduced.

[Brief description of the drawings]

FIG. 1 is a main part plan view showing a first embodiment of a scroll type fluid machine according to the present invention.

FIG. 2 is a sectional view taken along line X, X in FIG.

FIG. 3 is an upper cross-sectional view of the scroll fluid machine.

FIG. 4 is an essential part plan view showing the second embodiment.

FIG. 5 is a sectional view taken along line Y, Y of FIG. 4;

FIG. 6 is a top sectional view of a conventional scroll type fluid machine.

FIG. 7 is a plan view of a main part of a conventional thrust bearing.

[Explanation of symbols]

1; scroll (fixed scroll); 2; scroll (revolving scroll); 3; housing; 30; annular recess; 31; annular groove;
5; crank part, 6; storage chamber, 7; radiation groove, 71; first oil groove, 71a; deep groove, 71b; wide groove, 72; second oil groove, 72a; shallow groove, 72b; Thrust bearing, 80; support surface, 9; oil supply passage, 10; casing

Claims (2)

(57) [Claims] A housing (3) is provided inside a casing (10).
A pair of scrolls 1 and 2 are disposed through the housing 3, and a housing chamber 6 for housing a crank portion 5 provided at an end of the drive shaft 4 is provided in the housing 3, and an inner peripheral edge of the housing 3 faces the housing chamber 6. An annular thrust bearing 8 having, on the top surface of the housing 3, a support surface 80 for supporting the back surface of one of the scrolls 2, and a large number of radiation grooves 7 opening on the support surface 80.
In a scroll type fluid machine in which an oil supply passage 9 provided inside the drive shaft 4 is opened inside the housing chamber 6, a radially inner groove portion of the radial groove 7 is replaced with a first oil groove. 7
1, a radially outer groove portion of the radial groove 7 continuous with the first oil groove 71 is formed in a second oil groove 72 having a smaller flow area than the first oil groove 71 , No.
One oil groove 71 is a wide groove 71b, and the second oil groove 72 is
The narrow groove 72b having a narrower width than the wide groove 71b
A scroll type fluid machine characterized by being formed respectively . 2. A housing 3 inside a casing 10.
A pair of scrolls 1 and 2 are arranged via
The crank 3 provided at the end of the drive shaft 4 is housed in the ring 3.
And the inner peripheral edge of the accommodation chamber 6
On the top surface of the housing 3 to be exposed, one scroll
A support surface 80 for supporting the rear surface of the
Annular thrust bearing 8 having a number of radial grooves 7
And a refueling passage provided inside the drive shaft 4.
Scroll fluid with 9 open to the interior of said chamber 6
In the machine, the radially inner groove portion of the radiation groove 7 is referred to as a first oil groove 7.
1, the radiation groove 7 which is continuous with the first oil groove 71.
The radially outer groove portion flows more than the first oil groove 71.
A ring formed in each of the second oil grooves 72 having a small road area and receiving the thrust bearing 8 in the housing 3.
The annular recess 30 is provided on the outer peripheral wall of the annular recess 30.
An annular groove 31 for opening an outer side exit portion of the radiation groove 7;
The thrust bearing 8 is provided upright on the outer side of the annular groove 31.
And the annular weir 32, which is approximately the same height as the support surface 80,
A scroll type fluid machine characterized by being provided .