JPH03210086A - Seal section structure of sway scroll for scroll compressor - Google Patents

Abstract

PURPOSE:To obtain a pressure relief function and assure a stable action during the stationary operation by communicating split seal grooves provided on the end face of the spiral side plate of a sway scroll with slit grooves finer than the seal grooves. CONSTITUTION:Three split seal grooves 42a, 42b, 42c are formed on the end face of the spiral side plate 40 of a sway scroll 60, seal materials 41a, 41b, 41c are inserted and arranged respectively, and the seal grooves 42a, 42b and the seal grooves 42b, 42c are communicated by grooves 61a, 61b set to the size narrower than the seal grooves. The high pressure guided through the inner periphery gap 43a between the seal material 41a and the seal groove 42a from a compression chamber formed on the most inner periphery side by the spiral side plate 40 of the sway scroll 60 and the spiral side plate of a fixed scroll can be applied to the seal materials 41b, 41c inserted into the seal grooves of the outer spiral side plate respectively as back pressure.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a seal structure of an oscillating scroll in a scroll compressor, and more specifically, to a structure used in a refrigeration system or an air conditioner to compress a gas such as fluorocarbons. The present invention relates to a structure of a seal portion of an oscillating scroll in a scroll compressor.

(Prior art) Conventionally, this type of scroll compressor has been developed, for example, in
2 (one disclosed in Publication No. 16989, etc. is known. Such a conventional scroll compressor will be explained based on FIG. 3. In FIG. 3, reference numeral 1 has an oil reservoir 2 inside. Shells 3 and 4 are housed inside shell 1, and a fixed scroll and an oscillating scroll 6, which are combined together to form a compression chamber 5, are attached below both scrolls 3 and 4, and are oil-filled. A frame as a bearing support is provided above the oil reservoir 2 and has an oil return hole 7; 8 is an electric motor for driving a scroll provided between the frame 6 and the oil reservoir 2; 9 is driven by the electric motor 8 to supply oil. 11 and 12 are suction pipes and discharge pipes, 13 and 14 are suction ports and discharge ports, and 15 is connected to the discharge pipe 12 through the discharge port 14. discharge chamber communicating with, 1617
and 18 indicate bearings as lubricated parts, respectively.

According to the conventional scroll compressor configured in this way, when the main shaft 9 is driven by the electric motor 8 as shown by the solid line arrow, gas is sucked into the compression chamber 5 through the suction pipe 11 and the suction port 13. Gas compressed by the scroll compression principle known in the art passes through the discharge port 14 and is discharged from the discharge pipe 12 to the outside of the shell 1.

On the other hand, when the electric motor [8] rotates, oil in the oil reservoir 2 is sucked by the action of the centrifugal pump, passes through the oil supply hole 10 as indicated by the broken line arrow, and is supplied to each bearing 1617, 18.

Thereafter, the oil passes through the oil return hole 7 and returns to the oil sump 2.

FIG. 4 is a sectional view of a compression chamber in which a fixed scroll 3 and an oscillating scroll 4 are combined in this conventional scroll compressor. In FIG. 4, reference numerals 30 and 40 indicate spiral side plates of the fixed scroll 3 and the orbiting scroll 4, respectively, and 19 indicates a chip seal for sealing an axial gap.

The relative position of the oscillating scroll 4 with respect to the fixed scroll 3 in FIG. 4 is the state immediately before the discharge chamber 15 and a pair of symmetrical innermost compression chambers 5a, 5b communicate with each other.

Here, the discharge chamber 15 is always in communication with the discharge port 14, and its internal pressure P0 is equal to the discharge pressure. The compression chambers 5a and 5b have the same pressure and have a pressure Pl, and a pair of symmetrical compression chambers 5c and 5d on the outside also have the same pressure and have a pressure P2. Further, a compression chamber has not yet been formed outside the chamber, and if the pressure is P3, this is equal to the suction pressure. Here, during normal compression, P o > P + > P
z> P 3 , but the discharge chamber 15 and the compression chambers 5a, 5
It can be seen that after b communicates, P, -P,>Pg>P3.

In a scroll compressor with such a conventional structure, it may start up with a large amount of liquid refrigerant lying in the shell 1, or
During liquid hacking, when a large amount of liquid refrigerant is sucked, the liquid becomes compressed, and in particular, the pressure P immediately before the innermost compression chambers 5a and 5b communicate with the discharge chamber 15 becomes the maximum pressure, and the pressure P increases to 10 in pulses.
It may reach 0 to 200 atg. The relationship between this special pressure is P o < P + :> P z > P 3
becomes.

In such a state, the differential pressure between Po and P+ Pg and Pl becomes abnormally large, and each spiral side plate 30
．． The stress at the base of the scroll 40 may become large, causing deformation or damage, or misalignment between the fixed scroll 3 and the frame 6 (usually only bolted together) may cause damage to the fixed scroll 3 and the oscillating scroll 4. There has been a problem that the relative positional relationship of the spiral side plates 30 and 40 is shifted, resulting in a locked state and generation of abnormal noise.

As a countermeasure to this problem, conventionally, as shown in FIG. A relief structure was considered. In FIG. 5, reference numeral 20 denotes a communication port provided in the end plate 3a of the fixed scroll 3 to communicate the compression chambers 5a, 5b and the shell inner space, and the opening to the shell inner space is Each is provided with a pressure relief mechanism 21 whose detailed structure is shown in FIG.

Referring to FIG. 6, the pressure relief mechanism 21 has a hole 22 that communicates with the inner shell space on the side, and a hole that communicates with the communication hole 20 provided in the fixed scroll end plate 3a at the bottom in the installed state. A valve 25 and a coil spring 26 are installed inside the casing 24 so as to airtightly block communication between the hole 23 and the hole 22, and the upper end of the coil spring 26 is It is locked by a fixing element 27 such as a C-shaped retaining ring.

With such a structure, as mentioned above, the compression chamber 5a,
When the absolute value of the pressure pulse generated in 5b exceeds the operating pressure of the pressure relief mechanism 21, the valve 25 floats upward and the communication hole 20. Hole 23. The holes 22 communicate with each other and are relieved to the inner space of the toll, and the absolute value of the pressure inside the compression chambers 5a and 5b can be reduced. 20, as shown in FIG. 7(C), the back pressure P5 acting on the sealing material 41 when the relief mechanism 21 is activated is reduced.
1 becomes too large, the sealing material 41 deforms and protrudes toward the communication hole 20 side, and the sealing material 41 is scraped by the edge of the communication hole 20, resulting in abnormal wear. For this reason, conventionally, as shown in FIGS. 8 and 9, the groove 42 into which the sealing material 41 is inserted is divided into a plurality of parts 42a42b42cL, and each of the grooves 42a
, 42b and 42c, respectively, with sealing materials 41a, 41b,
41c was inserted to prevent the sealing material from sliding or interfering with the communication hole 20.

(Problem B to be Solved by the Invention) According to such an improved scroll compressor, liquid compression occurs in the compression chamber, and wear of the sealing material when the pressure relief mechanism 21 is activated is improved. As shown in FIG. 9, by completely dividing the seal groove, the pressure in the compression chamber does not rise sufficiently in the seal groove 42b42c during steady operation, and the seal members 41b, 41c and the seal groove 42b separate.

A new problem has arisen in that the pressure introduced from the inner circumferential gaps 43b and 43c between the seals 42c does not reach the pressure that activates the seals 42b and 42c, resulting in malfunction of the seals and reduced performance. .

The purpose of the present invention was to solve the problems in conventional scroll compressors, and to reduce the abnormal high pressure in the compression chamber that occurs when compressing liquid in the compressor while ensuring high reliability for each component. It is an object of the present invention to provide a seal structure for an oscillating scroll in a scroll compressor that can provide relief and provide high performance even during steady operation.

(Means for Solving the Problems) The seal structure of the oscillating scroll in the scroll compressor according to the present invention is such that the end face of the oscillating scroll spiral end plate communicates with the relief mechanism provided on the fixed scroll end plate during operation. It is characterized in that the seal grooves, which are divided and provided so as not to slide on the holes, are communicated with each other by slit grooves that are narrower than the seal grooves.

(Function) According to the seal structure of the oscillating scroll in the scroll compressor according to the present invention, the innermost compression chamber pressure acting on the bottom surface of the innermost seal groove is distributed between the divided seal grooves. The innermost compression chamber pressure (acting on do.

(Example) Hereinafter, the structure of the seal portion of the oscillating scroll in the scroll compressor of the present invention will be described in more detail with reference to an example shown in the attached opening.

FIG. 1 shows an oscillating scroll 60 equipped with a seal structure according to an embodiment of the present invention.

No. 8
Similar to the orbiting scroll shown in Figure 3, sole grooves 42a, 42b, and 42c are divided into three parts. Seal members 41a and 41b are respectively provided in the seal grooves 42a and 42b42c.

41c is inserted. Each of these seal grooves 42a
and 42b and the seal grooves 42b and 42c are communicated with each other through slit grooves 61a and 61b, which are narrower than the seal groove, as shown in FIG. The rest of the configuration is the same as that of a conventional scroll compressor.

Seal grooves 42a, 42b, 42c divided in this way
In the scroll compressor in which the slit grooves 61a and 61b communicate with each other, the volute side plate 40 of the oscillating scroll 60 and the volute side plate 3 of the fixed scroll 3 during steady operation as described above.
From the compression chambers 5a and 5b formed on the innermost circumferential side by 0,
Gap 43 on the inner circumferential side between the seal material 41a and the seal groove 42a
The high pressure introduced from a is guided to the seal grooves 42b and 42c in the outer spiral side plates, and can act as back pressure on the seal members 41b and 41c inserted into these seal grooves, respectively.

(Effects of the Invention) As explained above, according to the structure of the seal part of the oscillating scroll in the scroll compressor of the present invention, the sealing material is divided and arranged in the communication hole that communicates with the pressure relief mechanism so as not to interfere with it during sliding. By communicating between the seal grooves with a slit groove that is narrower than the seal groove, high pressure can be effectively applied to the back of the seal material, which has a pressure relief function and is stable during steady operation. The operation of the scroll compressor can be ensured.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an oscillating scroll equipped with an oscillating scroll seal structure in a scroll compressor according to an embodiment of the present invention, and FIG. FIG. 3 is a vertical cross-sectional view showing a conventional scroll compressor, FIG. 4 is a configuration explanatory diagram showing the compression chamber in the scroll compressor with shadow lines, and FIG.
The figure is a vertical sectional view showing a conventional scroll compressor equipped with a pressure relief mechanism, and FIG. 6 is a cross section V showing a partially enlarged pressure relief mechanism in the conventional scroll compressor shown in FIG. FIG. 7(a), FIG. 7(+)) and FIG. 7(C) are configuration explanatory diagrams respectively showing the state of pressure acting on the sealing material in the conventional scroll compressor shown in FIG. FIG. 8 is a plan view showing the oscillating scroll in the conventional scroll compressor shown in FIG.
The figure is a cross-sectional view of the orbiting scroll shown in FIG. 8. 3... Fixed scroll, 5a, 5b... Compression chamber on the inner peripheral side, 20... Communication port, 21... Pressure relief mechanism, 40... Spiral side plate, 41a, 41b, 41cm.
・Seal material, 42a, 42b, 42cm seal groove, 60
... Oscillating scroll, 61a, 61b... slit groove. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A fixed scroll and an oscillating scroll each having a spiral side plate are combined so as to cooperate to form a compression chamber,
In a sealing structure of an oscillating scroll used in a scroll compressor including a pressure relief mechanism that relieves the pressure to the outside of the fixed scroll through a communication port when the pressure in the innermost compression chamber reaches a maximum pressure, Seal grooves 42 formed separately on the end surface of the scroll side plate of the moving scroll.
a, 42b, 42c, the sealing materials 41a, 41b, 41c inserted into the respective seal grooves, and the seal grooves formed to communicate between the adjacent seal grooves 42a and 42b, 42b and 42c. Thin slit grooves 61a, 61
A seal portion structure of an oscillating scroll in a scroll compressor comprising: b.