JP2817528B2 - 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 Application 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. 9, an annular thrust bearing S having a support surface P for supporting the back surface of the revolving scroll O and a large number of radial grooves M opening in the support surface P is provided via the G. On the other hand, an oil supply passage T for pumping lubricating oil stored in the bottom of the casing D is provided inside the drive shaft K, and the oil supply passage T is mounted on a swing link L by a bearing B
From the upper surface of the swing link L to the inside of the housing chamber E through the gap, and the oil flows into the radial groove M of the thrust bearing S, so that good thrust support of the revolving scroll O can be performed by oil lubrication. Like that.

[0003]

However, in the above-mentioned structure, a relatively large amount of oil enters the inside of the radiation groove M due to the centrifugal action of the crank portion C in the storage chamber E. Although preferable for lubrication, on the other hand, the amount of oil overflowing from the outer side outlet of the radiation groove M also increases, and a large amount of oil flows out to the outer peripheral area of each scroll F, O, and between the scrolls F, O. There is a problem in that a large amount of oil is taken into the working chamber to be defined, oil compression occurs, and the amount of oil taken out together with the discharge fluid increases, so-called adverse effect of oil rising occurs.

In this case, it is conceivable to reduce the flow passage area of the radiation groove M to reduce the amount of oil flowing into the radiation groove M from the storage chamber E. In this case, however, the supporting surface P of the thrust bearing S is considered. In this case, the oil cannot be sufficiently supplied, and clogging or the like easily occurs in the radiation groove M, so that it is impossible to perform the original good thrust support.

A main object of the present invention is to provide a scroll-type fluid machine capable of performing good thrust support, reducing the amount of oil flowing out of the thrust bearing, and reducing oil rise. .

[0006]

Therefore, in order to achieve the above-mentioned main object, first, a pair of scrolls 1 and 2 are disposed inside a casing 10 via a housing 3 and the housing 3 is provided with a pair of scrolls 1 and 2. Crank part 5 provided at the end of drive shaft 4
And a support surface 80 for supporting the back surface of one of the scrolls 2 on a top surface of the housing 3 having an inner peripheral surface facing the housing chamber 6.
An annular thrust bearing 8 having a large number of radial grooves 7 opening to zero is provided, and an oil supply passage 9 for pumping lubricating oil stored in the casing 10 is provided inside the drive shaft 4. In the scroll-type fluid machine in which the oil supply passage 9 is opened to the inside of the storage chamber 6, the intermediate portion of at least one radiation groove 7 is communicated with the internal space of the casing 10 via an oil return passage 70. .

Secondly, in the first means, the excess oil is returned to the thrust bearing 8 by dispersing the oil along the circumference of the thrust bearing 8 so as to achieve better thrust support and oil recovery. In order to perform this operation, an oil return hole 71 communicating with the thrust bearing 8 on the side opposite to the support surface is opened in the plurality of radial grooves 7, and these oil return holes 71 and the oil return holes 71 are connected to the thrust bearing 8. An annular communication groove 72 communicating with each other on the side opposite to the support surface of the casing 10;
And a communication hole 73 communicating with the internal space of the oil return passage 70.
Was formed.

Thirdly, in each of the first and second means, the oil flowing out from the outlet on the outer side of the radiation groove 7 is temporarily blocked to effectively collect the oil in the oil return passage 70. Let them do
In order to perform better oil return, the housing 3
An annular recess 30 for receiving the thrust bearing 8 is provided on the outer peripheral wall of the annular recess 30. An annular groove 31 for opening the outer side outlet of the radiation groove 7 and an outer side of the annular groove 31 are provided. An annular weir 32 is provided standing upright and substantially flush with the support surface 80 of the thrust bearing 8.

Fourthly, in each of the first and second means, in order to allow the oil to smoothly flow into the oil return passage 70, the radiation groove 7 is provided around the inlet portion of the oil return passage 70. An oil reservoir 7a of a size surrounding the oil reservoir was provided.

[0010]

According to the first means, the oil that has flowed into the radiation groove does not only try to flow out from the outer outlet of the radiation groove, but also returns to at least one radiation groove. It is collected inside the casing 10 through 70. In this case, since the oil return passage 70 is only opened in the radiation groove 7, the flow path area of the radiation groove 7 is not reduced and the amount of oil flowing from the storage chamber 6 is not reduced. 7
A sufficient amount of oil can be taken in, the oil can be smoothly circulated on the support surface 80 of the thrust bearing 8, and good thrust support can be performed. Then, the scrolls 1, 2, 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3 ′
, The amount of oil flowing out to the outer peripheral region can be reduced, thereby reducing the rise of oil.

By the second means, the oil return holes 71 are opened in the plurality of radiation grooves 7 to perform oil return, so that excess oil is returned from the thrust bearing 8 on the circumference of the thrust bearing 8. Along the circumference of the thrust bearing 8, and the oil distribution along the circumference of the thrust bearing 8 can be made uniform. Thus, more favorable thrust support and oil recovery can be performed. Moreover, the plurality of radiation grooves 7 are not communicated with the casing 10 via independent oil return passages, but the respective oil return holes 71 extending from the respective radiation grooves 7 are gathered in an annular communication groove 72, and this communication groove is formed. Since it is opened from 72 to the casing 10 through the communication hole 73, the overall configuration of the oil return passage 70 can be simplified.

By the third means, the oil which is about to flow out from the outlet on the outer side of the radiation groove 7 is blocked by the annular weir 32 and accumulates in the annular groove 31. Thus, each of the scrolls 1, 2 is directly provided by the annular weir portion 32.
The amount of oil flowing out to the outer peripheral region of the radial groove 7 can be reduced, and the oil that accumulates in the annular groove 31 can flow into the oil return passage 70 opened in the middle of the radial groove 7 and be collected inside the casing 10. , As a whole, each scroll 1, 2,
The amount of oil flowing out to the outer peripheral region can be further reduced. 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 scroll 2 received by the thrust bearing 8 rises on the outer peripheral side 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 portion 32. Rather, the annular weir portion 32 is made to be substantially the same height as the support surface 80 of the thrust bearing 8, so that the radiation groove 7 The annular groove 31 and the scroll 1,
2 can be minimized, and the amount of spilled oil can be effectively reduced.

By the fourth means, the surplus oil of the thrust bearing 8 can smoothly flow into the oil return passage 70 via the oil reservoir 7a, and the surplus oil of the thrust bearing 8 can be collected well. it can.

[0014]

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 inner working chamber 13 from the outer peripheral region 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.

The oil that accumulates at the bottom of the storage chamber 6 passes through the casing 1 through an oil drain 33 that opens to the side of the housing 3.
The oil collected in the high pressure chamber 16 and the oil collected in the high pressure chamber 16 are collected in the casing 10 through the oil return pipe 18 inserted into the through hole 34 formed in the fixed scroll 1 and the housing 3.

In the above-described configuration, as shown in FIG. 1, the thrust bearing 8 has a large number of radiating parts, that is, a total of twelve radiating parts, for example, three in a quarter-arc part opened in the supporting surface 80 as shown in the figure. As shown in FIG. 2, a first passage 70 a formed in the axial direction of the thrust bearing 8 and a second passage 70 b provided in the housing 3 have at least one intermediate portion in the radiation groove 7. Oil return passage 70 composed of
Through the oil discharge passage 33 leading to the internal space of the casing 10. Radiation groove 7 opening oil return passage 7
Is provided with an oil reservoir 7a that surrounds the entrance of the first passage 70a and has a diameter larger than the diameter of the first passage 70a.

Further, 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 oil that has flowed into the radiation groove 7 not only tries to flow out from the outer side outlet of the radiation groove 7 but also from the middle of the radiation groove 7 through the oil reservoir 7a. The oil smoothly flows into the oil return passage 70 and is collected inside the casing 10 through the oil return passage 70 and the oil drain passage 33. In this case, only the oil return passage 70 is opened in the radiation groove 7, and the flow path area of the radiation groove 7 is not reduced to reduce the amount of oil flowing from the storage chamber 6.
And a sufficient amount of oil can be taken in, and the oil can be smoothly fed to the support surface 80 of the thrust bearing 8. The amount of oil flowing out of the radial groove 7 to the outer peripheral area 12 of each of the scrolls 1 and 2 in accordance with the amount of oil collected through the oil return passage 70 opened in the middle of the radial groove 7. The amount can be reduced, and the rise of oil can be reduced.

In addition, the oil which is about to flow out of the outlet on the outer side of the radiation groove 7 is blocked by the annular dam 32,
Since the oil is stored in the annular groove 31, the amount of oil flowing out to the outer peripheral area of each of the scrolls 1 and 2 can be reduced directly by the annular weir 32, and the oil stored in the annular groove 31 is removed in the middle of the radiation groove 7. The oil can be flown into the oil return passage 70 opened in the portion and collected inside the casing 10, and as a whole, the amount of oil flowing out to the outer peripheral area 12 of each of the scrolls 1 and 2 can be further reduced. . In addition, the annular weir portion 32 is at the same height as the support surface 80 of the thrust bearing 8, but as shown by the imaginary line in FIG. It is possible to avoid the occurrence of a contact accident between the outer peripheral side back surface and the top surface of the annular weir portion 32, and by making the annular weir portion 32 the same height as the support surface 80, the The gap can be minimized, and the amount of spilled oil can be effectively reduced. Further, the annular weir 32 is attached to the thrust support surface 8.
0, so that these annular weirs 32
And the support surface 80 of the thrust bearing 8 can be cut at the same time.

In the above embodiment, one oil return passage 70 is opened in one radiation groove 7 to return oil from one place. However, as shown in FIGS. For example, an oil return hole 71 communicating with the thrust bearing 8 on the opposite support surface side is opened for each of the six radial grooves 7, and each of the oil return holes 71 and the opposite thrust bearing 8 on the opposite support surface side. The oil return passage 70 is formed by an annular communication groove 72 that communicates the oil return holes 71 with each other, and a communication hole 73 that communicates the communication groove 72 with the oil discharge passage 33 that communicates with the internal space of the casing 10. The oil may be returned from a plurality of locations along the circumference of the thrust bearing 8.

In this case, surplus oil can be returned from the thrust bearing 8 by dispersing the oil along the circumference of the thrust bearing 8, and flows out from the outer outlet of the radiation groove 7. The oil amount can be further reduced, the oil distribution along the circumference of the thrust bearing 8 can be made uniform, and more favorable thrust support and oil recovery can be performed. Moreover, instead of communicating the plurality of radiation grooves 7 with the casing 10 via independent oil return passages, the oil return holes 71 extending from each radiation groove 7 are gathered in an annular communication groove 72, and this communication groove is formed. Since it is opened from 72 to the casing 10 through the communication hole 73, the overall configuration of the oil return passage 70 can be simplified.

The annular groove 72 is provided on the side opposite to the support surface of the thrust bearing 8 as shown in FIG. 5 and, as shown in FIG.
May be provided in the annular recess 30. In this case, the same operation and effect can be obtained.

In each of the above embodiments, the second passage 70b and the communication hole 73 forming the outlet side of the oil return passage 70 extend straight in the axial direction and join the oil discharge passage 33. 7, the axial passage 73a and the radial passage 73
b may be provided so as to merge with the through hole 34 through which the oil return pipe 18 is inserted. In this case, the same operation and effect as described above can be obtained.

[0025]

As described above, according to the first aspect of the present invention, the intermediate portion of at least one radial groove 7 provided in the thrust bearing 8 is connected to the casing 10 via the oil return passage 70.
, The thrust of the scroll 2 can be favorably supported by the oil lubrication, and the excess oil of the thrust bearing 8 can be recovered through the oil return passage 70. The amount of oil flowing out to the outer peripheral regions of the scrolls 1 and 2 can be reduced, and the rise of oil can be reduced.

According to the second aspect of the present invention, the oil return holes 71 opened in the plurality of radiation grooves 7, the communication grooves 72 communicating these with each other, and the communication holes 73 communicating with the casing 10 are simplified. With such a configuration, it is possible to return the surplus oil in the thrust bearing 8 by dispersing it along the circumference of the thrust bearing 8, and to further reduce the amount of oil flowing out from the outer outlet of the radiation groove 7. Oil distribution along the circumference of the thrust bearing 8 can be made uniform, and more favorable thrust support and oil recovery can be performed.

According to the third aspect of the present invention, the annular groove 31 and the annular weir 32 at the outlet on the outer side of the radiation groove 7 provide
The oil flowing out from the radiation groove 7 is temporarily blocked, and the oil recovery in the oil return passage 70 can be effectively performed, so that more excellent oil return can be performed.

According to the fourth aspect of the present invention, the surplus oil of the thrust bearing 8 can smoothly flow into the oil return passage 70 through the oil reservoir 7a, and the surplus oil of the thrust bearing 8 can be collected well. can do.

[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 an essential part cross-sectional view showing the third embodiment.

FIG. 7 is a sectional view of a main part showing the fourth embodiment.

FIG. 8 is a top sectional view of a conventional scroll type fluid machine.

FIG. 9 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, 7a; Oil reservoir, 70; Oil return passage, 71; Oil return hole, 72; Communication groove, 73; Communication hole, 8; Thrust bearing, 80; Support surface,
9; oil supply passage; 10; casing

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI F04C 29/02 361 F04C 29/02 361A

Claims (4)

(57) [Claims] A pair of scrolls (1) and (2) are disposed inside a casing (10) via a housing (3), and a housing chamber (6) for accommodating a crank section (5) provided at an end of a drive shaft (4) is provided in the housing (3). In addition to the above, the top surface of the housing 3 facing the inner peripheral edge of the housing chamber 6 has a support surface 80 for supporting the back surface of one scroll 2 and a large number of radiation grooves 7 opening to the support surface 80. While the annular thrust bearing 8 is disposed, an oil supply passage 9 for pumping lubricating oil stored in the casing 10 is provided inside the drive shaft 4, and the oil supply passage 9 is provided inside the accommodation chamber 6. In the scroll type fluid machine which is opened, a middle part of at least one radiation groove 7 is communicated with an internal space of the casing 10 via an oil return passage 70. Body machine. 2. An oil return hole 71 communicating with the thrust bearing 8 on the side opposite to the support surface is opened in the plurality of radial grooves 7, and these oil return holes 71 and the oil return holes 71 are connected to the thrust bearing 8 respectively.
Annular communication groove 7 communicating with each other on the side opposite to the support surface
2. The scroll fluid machine according to claim 1, wherein an oil return passage is formed by the communication groove and a communication hole that communicates the communication groove with the internal space of the casing. 3. An annular recess 30 for receiving the thrust bearing 8 in the housing 3. An annular groove 31 is formed in the outer peripheral wall of the annular recess 30 so as to open the outer outlet of the radiation groove 7.
And an annular weir 32 erected 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.
The scroll-type fluid machine according to claim 1 or 2, further comprising: 4. An oil reservoir 7a having a size surrounding the inlet of the oil return passage 70 is provided in the radiation groove 7.
Or a scroll type fluid machine according to claim 2.