JPH0435634B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a scroll-type fluid machine, and more specifically, it is provided with a fixed scroll and a revolving scroll, and a pressure chamber is provided on the back side of the revolving scroll. The present invention relates to a scroll-type fluid machine in which the fixed scroll is supported by the support member so as to be pressed against the fixed scroll by a high-pressure fluid introduced into the pressure chamber.

(Prior Art) This type of fluid machine is already known as described in Japanese Unexamined Patent Publication No. 50-32512, and the pressure chamber 60 in this conventional fluid machine is as shown in FIG. A receiver 64, which is attached to the lower end of the drive shaft 62 via a bearing 63, is fitted into a boss cylinder protruding from the back surface of the revolving scroll 61. By interposing an O-ring 65 in a cylindrical fitting portion formed between two members that do not move relative to each other, the inside thereof is defined.

In addition, in FIG. 12, 66 is a fixed scroll, and 67 is a fixed scroll.
is a preload spring.

(Problems to be Solved by the Invention) However, in the above conventional example, the pressure chamber 60 is
In this structure where the internal chamber is defined using only the O-ring 65, the first thing to improve the sealing performance is to improve the sealing surface. In addition to the need to improve accuracy, sealing is performed through elastic deformation, which is subject to material limitations, and there is also the problem of poor durability; In other words, when forming between members that move relative to each other, it is not possible to use an O-ring as in the conventional example described above.

It is an object of the present invention to use a seal ring to define a pressure chamber with high sealing performance by contact pressure based on the back pressure of the seal ring, and to be applicable even between members that move relative to each other. The advantage is that it expands the range of choices and has good durability.

(Means for Solving the Problems) Therefore, in order to achieve the above object, a fixed scroll 2 and a revolving scroll 3 are provided, and a pressure chamber 14 is provided at the center of the back surface of the revolving scroll 3 to create a high-pressure atmosphere inside. In a scroll-type fluid machine in which the revolving scroll 3 is pressed against the fixed scroll 2 by the pressing force from the pressure chamber 14 side, the revolving scroll 3 and a support disposed on the back side of the revolving scroll 3 are provided. A seal ring 10 having an annular groove 9 on one side of the member 8 and a sealing surface 83 on the other side, and having a sliding surface 101 in the annular groove 9 that makes sliding contact with the sealing surface 83.
is held so that the pressure chamber 14 is defined from the outer peripheral side chamber by the seal ring 10, and a back pressure chamber 24 formed between the back surface of the seal ring 10 and the bottom surface of the annular groove 9, While opening the outlet of the oil supply passage that pumps lubricating oil from the oil reservoir, the oil introduced into the back pressure chamber 24 is allowed to flow toward the pressure chamber 14 between the back pressure chamber 24 and the sealing surface 83. A passage 25 was provided.

(Function) Back pressure can be applied to the seal ring 10 by the oil introduced into the back pressure chamber 24 through the oil supply passage, and the sliding surface 10 of the seal ring 10
1 can be pressed against the sealing surface 83, a good seal can be achieved between the sliding surface 101 and the sealing surface 83, and the pressure chamber 14 can be well defined from the outer peripheral side chamber. Moreover, the oil introduced into the back pressure chamber 24 can flow to the pressure chamber 14 side through the passage 25 to supply lubricating oil between the sealing surface 83 and the sliding surface 101. These sealing surfaces 83 and sliding surfaces 10
1 and the oil supply to this member, the sealing performance of the pressure chamber 14 can be significantly improved.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

The embodiment shown in Figs. 1 and 2 was constructed to be applied to a compressor of a refrigeration system, and as shown in Fig. 2, a fixed scroll 2, a revolving scroll 3,
A compression element 4 is formed by the above, and the compression element 4 and the motor 5 are arranged vertically within the sealed casing 1.

A bearing portion 31 is formed on the back surface of the revolving scroll 3 on the motor 5 side, and the eccentric shaft portion 6a of the drive shaft 6 press-fitted into the rotor 51 of the motor 5 is fitted into the bearing portion 31 via a metal bearing 32. Together,
The revolution scroll 3 is rotated by the rotation of the motor 5.
I am trying to make it revolve.

Further, the fixed scroll 2 is provided with a suction port 21 and a discharge port 22, and the suction port 21
A suction pipe 7 having one end opened outside the casing 1 is connected to the compression element 4 with the discharge port 22 opened inside the casing 1.
The low pressure fluid flowing in from the suction port 21 is compressed, and the compressed high pressure fluid is sent to the discharge port 22.
The liquid is discharged from the casing 1 into the casing 1.

Note that 23 is an external discharge pipe.

Furthermore, as shown in FIGS. 1 and 2, a support member 8 for fixing the compression element 4 and the motor 5 is provided between the compression element 4 and the motor 5 by being press-fitted into the casing 1. A bearing 81 for pivotally supporting the drive shaft 6 is formed on the motor 5 side portion of the support member 8, while the compression element 4
A recessed portion 82 for receiving the revolving scroll 3 in a loose fit is formed on the side, and this recessed portion 82
The fixed scroll 2 is airtightly fixed to the outer peripheral end face of the compressor 4 to form a sealed space between the motor 5 side of the compression element 4 and the support member 8 in the recessed portion 82 .

Further, between the back surface of the revolving scroll 3 and the bottom surface of the recessed portion 82, there is provided an annular metal seal ring 10 surrounding the drive shaft 6, which will be described in detail later.
The space formed in the recessed portion 82 is divided into an inner circumferential side and an outer circumferential side, and the outer circumferential side of the divided space is compressed through the passage 11 formed in the fixed scroll 2. It communicates with the suction side of the element 4 and forms a low-pressure chamber 12 that maintains a low pressure, while the other inner circumferential space is connected to the casing 1 under high pressure through a passage 13 formed in the support member 8. The chambers communicate with each other to form a pressure chamber (hereinafter referred to as a high pressure chamber) 14 that maintains a high pressure.

In this way, high pressure acts on the pressure receiving surface 15 of the revolving scroll 3 in the high pressure chamber 14, and this pressing force provides a supporting force that presses the revolving scroll 3 against the fixed scroll 2.

The drive shaft 6 also has a first oil supply passage 16 which includes a passage part 161 extending in the axial direction from the lower end to the upper end (shaft end) and a passage part 162 extending in the radial direction from the passage part 161 and opening to the outer circumferential surface. An oil pickup 20 is installed at the lower end of the first oil supply passage 16, which plunges into an oil reservoir formed at the bottom of the casing 1.
, the lubricating oil in the oil reservoir can be supplied to each lubricating part via the first oil supply passage 16.

As described above, the high-pressure chamber 14 is defined between the revolving scroll 3 that revolves due to the rotation of the drive shaft 6 and the support member 8 that is a stationary member, and the seal in this high-pressure chamber 14 The seal structure using the ring 10 is constructed as follows.

That is, as shown in FIG. 1, an annular groove 9 surrounding the drive shaft 6 is formed on the back surface of the revolving scroll 3.
The annular groove 9 is equipped with the seal ring 10 having a sliding surface 101 that makes sliding contact with the seal surface 83 formed on the bottom surface of the recessed portion 82, and the back surface of the seal ring 10 and the bottom surface of the annular groove 9 are A back pressure chamber 24 is formed in between, and an annular passage 25 is formed between the inner circumferential surface of the seal ring 10 and the inner circumferential side of the annular groove 9, that is, on the high pressure chamber 14 side of the seal ring 10. (See FIG. 3) While the back pressure chamber 24 is communicated with the high pressure chamber 14 side of the seal ring 10 through the passage 25, the bottom surface of the bearing portion 31 and the upper end of the drive shaft 6 are connected to the revolving scroll 3. (shaft end)
and a second oil supply passage 2 that communicates with the back pressure chamber 24.
7 is formed.

Thus, by the rotation of the drive shaft 6, lubricating oil is pumped up into the first oil supply passage 16, a part of which is supplied to the oil chamber 26, and is further supplied to the back via the second oil supply passage 27. The back pressure chamber 24 is thus maintained at a high pressure, and high back pressure acts on the seal ring 10, causing the sliding contact surface 101 of the seal ring 10 and the seal surface 83 to A high contact surface pressure is generated between the parts, and this sealing part is sealed.

Furthermore, the lubricating oil supplied to the back pressure chamber 24 is led to the high pressure chamber 14 side of the seal ring 10 through the passage 25 and is replenished between the sliding surface 101 and the sealing surface 83. As a result, the sealing performance of the seal portion is further improved.

In this embodiment, as shown in FIG. 3, an annular recess 102 is formed on the outer peripheral surface of the seal ring 10.
An O-ring 36 is inserted into the recess 102 to seal between the outer circumferential surface of the seal ring 10 and the outer circumferential side of the annular groove 9. The purpose is to strictly prevent the oil from leaking into the low-pressure outer circumferential side chamber, and oil is introduced into the back pressure chamber 24 and between the outer circumferential surface of the seal ring 10 and the annular groove 9. Since the viscosity of the oil can seal the gap to some extent, such an O-ring 36 can be omitted as in the embodiment shown in FIG. 4 or FIG. 6, which will be described later.

Further, in this embodiment, as shown in FIG. By using the gap B in the direction, liquid compression is caused in the compression element 4, and when a confining pressure is generated, the revolving scroll 3 is configured to be able to move in the axial direction (in the direction of the arrow in FIG. 1). The movement of the revolving scroll 3 creates a space between the thrust surfaces of the revolving scroll 3 and the fixed scroll 2, so that the confinement pressure can be released to the suction side.

The present invention is not limited to the embodiments described above, and can be modified as follows.

A passage 25 communicating between the back pressure chamber 24 and the high pressure chamber 14 side of the seal ring 10 includes a fourth passage,
As shown in FIG. 5, an appropriate number of grooves may be provided in a groove extending vertically on the inner circumferential surface of the seal ring 10.

Alternatively, the passage 25 may be formed as a through hole in the seal ring 10 that connects the back surface of the ring 10 and the sliding surface 101, as shown in FIGS.

Second oil supply passage 27 formed in the revolving scroll 3
For ease of machining, as shown in FIG. 1, a horizontal portion is formed of an open hole drilled from the outer peripheral surface corresponding to the bearing portion 31 of the revolving scroll 3 and opening to the side portion of the revolving scroll 3. 27a, and a vertical portion 27 that communicates the horizontal portion 27a and the back pressure chamber 24.
It consists of b. Therefore, the horizontal portion 27
Although an unnecessary passage portion 27c is formed in the first
In the embodiment, this passage portion 27c is closed using a separately formed closing member 28. Therefore, in order to omit the closing member 28, as shown in FIGS. 8 and 9, the second oil supply passage 27
The horizontal part 27a of the metal bearing 32 in the bearing part 31 is opened transversely at the back side of the metal bearing 32 (at the joining area between the metal bearing 32 and the bearing part 31), and the metal bearing in the bearing part 31 is The second oil supply passage 2 is provided on the inner surface of the coupling hole 32.
7 and the oil chamber 26 may be formed, and the unnecessary passage portion 27c described above may be closed using the metal bearing 32.

Furthermore, as shown in FIGS. 10 and 11, the drive shaft 6 is connected to the first oil supply passage 16 at a height corresponding to the second oil supply passage 27.
While forming a horizontal hole 33 opening on the outer peripheral surface of the
An annular groove 34 is formed in the metal bearing 32 to face the opening of the horizontal hole 33, and the groove 34 is communicated with the second oil supply passage 27 through a hole 35. The ability to supply oil to the high pressure chamber 14 side of the seal ring 10 via the second oil supply passage 27 and the back pressure chamber 24 may be increased by utilizing a pumping action.

(Effects of the Invention) The present invention provides an annular groove 9 on one side of the revolving scroll 3 and a support member 8 disposed on the back side of the revolving scroll 3, and a sealing surface 83 on the other side, and the annular groove 9 holds a seal ring 10 having a sliding surface 101 that is in sliding contact with the sealing surface 83, the sealing ring 10 defines the pressure chamber 14 from the outer peripheral side chamber, and the back surface of the sealing ring 10 An outlet of an oil supply passage for pumping lubricating oil from the oil reservoir is opened in the back pressure chamber 24 formed between the back pressure chamber 24 and the bottom surface of the annular groove 9, and a Since the passage 25 is provided to allow the oil introduced into the back pressure chamber 24 to flow toward the pressure chamber 14, the seal defining the pressure chamber (high pressure chamber 14) is good, and the seal ring 10 is elastically deformable. Since it does not cause damage, you can choose from a wide range of wear-resistant materials such as metal.
Therefore, even when the pressure chamber (high pressure chamber) 14 is formed between two members that move relative to each other, both the sealing performance and durability of the seal structure can be made good.

[Brief explanation of drawings]

FIG. 1 is an enlarged longitudinal cross-sectional view of the main parts of the first embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of the same embodiment, and FIG.
The figure is an enlarged sectional view of the sealing portion of the same embodiment, FIG. 4 is a vertical sectional view of the sealing portion of another embodiment, FIG. 5 is a partial plan view of the seal ring of the same embodiment, and FIG. FIG. 7 is a partial plan view of the seal ring of the embodiment, FIG. 8 is a longitudinal sectional view of the main part of another embodiment, and FIG. 9 is a longitudinal sectional view of the main part of the embodiment. FIG. 10 is a longitudinal sectional view of a main part of still another embodiment, FIG. 11 is a sectional plan view of the same embodiment, and FIG. 12 is an explanatory diagram showing a conventional example. 2... fixed scroll, 3... revolving scroll, 8... support member, 9... annular groove, 10... seal ring, 14... pressure chamber (high pressure chamber),
16...First oil supply passage, 24...Back pressure chamber, 27...
...Second oil supply passage, 32...Metal bearing, 33...
Horizontal hole, 25...passage, 26...oil chamber, 29...notch, 83...sealing surface, 101...sliding surface.

Claims (1)

[Scope of Claims] 1. A fixed scroll 2 and a revolving scroll 3 are provided, and a pressure chamber 14 with a high pressure atmosphere inside is provided on the center side of the back surface of the revolving scroll 3, and a pressing force from the pressure chamber 14 side is provided. In a scroll type fluid machine in which the revolving scroll 3 is pressed against the fixed scroll 2, an annular groove 9 is formed in one of the revolving scroll 3 and a support member 8 disposed on the back side of the revolving scroll 3; A seal ring 10 is provided with a sealing surface 83 on each side, and has a sliding surface 101 in sliding contact with the sealing surface 83 in the annular groove 9.
0 to define the pressure chamber 14 from the outer peripheral side chamber, and a back pressure chamber 24 formed between the back surface of the seal ring 10 and the bottom surface of the annular groove 9;
While opening the outlet of the oil supply passage that pumps lubricating oil from the oil reservoir, the oil introduced into the back pressure chamber 24 is allowed to flow toward the pressure chamber 14 between the back pressure chamber 24 and the sealing surface 83. A scroll-type fluid machine characterized in that a passage 25 is provided. 2. An oil supply passage that opens into the back pressure chamber 24 is formed in the drive shaft 6 that drives the revolving scroll 3, and includes a first oil supply passage 16 that supplies oil to the lubricated portion, and a second oil supply passage that communicates with the first oil supply passage 16. 27. The scroll-type fluid machine according to claim 1, comprising: 27. 3 The exit side of the first oil supply passage 16 is located in the axial direction at the fitting portion between the revolving scroll 3 and the drive shaft 6.
The scroll-type fluid machine according to claim 2, which opens into an oil chamber 26 formed in an intermediate portion, and an inlet side of a second oil supply passage 27 communicates with the oil chamber 26. 4. A metal bearing 32 in which the second oil supply passage 27 is provided with an open hole that opens to a side portion of the revolving scroll 3, and this open hole is interposed in a fitting portion between the revolving scroll 3 and the drive shaft 6. The open hole is closed by the outer circumference of the metal bearing 32, and the connection hole of the metal bearing 32 is disposed in a transverse manner at the connecting portion of the metal bearing 32. The scroll-type fluid machine according to claim 3, which communicates with each other via a notch 29 cut out on the inner surface. 5 The first oil supply passage 16 includes a horizontal hole 33 that extends radially outward from the first oil supply passage 16 and opens at the outer periphery of the drive shaft 6, and the second oil supply passage 27 communicates with the horizontal hole 33. Scroll type fluid machine according to claim 2.