JPH05180176A - Scroll compressor - Google Patents

Abstract

PURPOSE:To provide a highly reliable compressor by supporting a seal member by an elastic body, in a scroll compressor in which the seal member is provided at a close-fitting part between the opening end of a delivery cover and the cylindrical part of a fixed scroll base plate. CONSTITUTION:While a scroll compressor is operated, a seal member 13 is pressed against the upper end 12a of an annular groove 12 in a base plate cylindrical part 10 by a pressing pressure of an elastic body 23 for sealing. Also a clearance between the outer periphery part 13a of the seal member 13 and a delivery cover 11 is sealed to disconnect the opening part of the delivery cover 11 from the base plate cylindrical part 10 and function them normally as the compressor. On the other hand, in starting, because a force acting on the seal member 13 by a pressure of the high-pressure fluid is made larger than the pressing pressure of the elastic body 23, the seal member 13 is moved downward. Thus a clearance is made between the upper end 12a of the annular groove 12 and the seal member 13, and the fluid such as liquid refrigerant, etc. is leaked from the inside of the delivery cover 11 into a space in the shell 1 to produce no abnormal rise in pressure and no failure in starting. The plastic deformation of the delivery cover 11 is also prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor suitable for use as a refrigerant or air compression in a refrigeration system, an air conditioner, or the like.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing an entire conventional scroll compressor disclosed in, for example, Japanese Utility Model Publication No. 3-19481, and FIG. 5 is a sectional view showing an essential part of the scroll compressor. In the figure, 1 is a shell having a discharge pipe hole 2 opening in the axial direction, 3 is a main shaft provided inside the shell 1 and having an oil supply hole 4 and an eccentric hole 5, and 6 is this main shaft 3
An oscillating scroll 8 supported in an eccentric hole 5 through an oscillating bearing 7 and having an oscillating shaft 6b on an oscillating scroll base plate 6a, 8 is eccentrically combined with the orbiting scroll 6,
A fixed scroll 9 having a discharge port 8b on the base plate 8a;
Is a check valve for opening and closing the discharge hole 8b attached to the fixed scroll base plate 8a.

Reference numeral 10 is a cylindrical portion provided on the fixed scroll base plate 8a, and 11 is a funnel-shaped discharge cover which is inserted through the discharge pipe hole, and is attached to the discharge pipe hole 2 of the shell 1. 12 is an annular groove provided in the tubular portion 10, 13
Is a seal member mounted in the annular groove 12. 1
The main bearings 16, 4 are fitted with the spigots,
An upper bearing support and a lower bearing support that support the main shaft 3 via 17. Reference numeral 18 is a motor stator fixed to the lower bearing support 15, and 19 is a motor rotor provided inside the motor stator 18 and fixed to the main shaft 3. Further, 20 is a compression chamber formed by both scrolls 6 and 8, 21 is an oil reservoir, and 22 is a suction pipe.

Next, the operation of the conventional scroll compressor will be described. When the main shaft 3 rotates due to the rotation of the motor rotor 19, the orbiting scroll 6 oscillates. At this time, the low-pressure fluid in the shell 1 is guided to the compression chamber 20, the volume of the compression chamber 20 is gradually reduced, and the high-pressure fluid is discharged from the discharge port 8b into the discharge cover. Here, the space between the fixed scroll tubular portion 10 and the opening of the discharge cover 11 is closed by a seal member 13.

[0005]

Therefore, there is a problem in that the inside of the discharge cover 11 is abnormally increased in pressure at the time of starting to lie down to cause a starting failure. There is also a problem that the discharge cover 11 is plastically deformed by the pressure inside the discharge cover.

The present invention has been made in order to solve the above problems, and it is possible to prevent a start-up failure at the time of start-up while lying down, and also to prevent plastic deformation of the discharge cover, which is a highly reliable scroll compressor. Aim to get.

[0007]

In order to achieve the above object, a shell having a discharge pipe hole which is opened in the axial direction, and an orbiting scroll which is housed inside the shell and has an orbiting shaft at its end plate are provided. A fixed scroll that is combined with the orbiting scroll and has a discharge port on its end plate; and a check valve that is attached to the fixed scroll and that opens and closes the discharge port. A cylindrical portion is provided around the check valve. The discharge cover is projected so that the opening end is fitted to this tubular portion,
It is provided on the fixed scroll end plate and fixedly provided on the shell side, and a seal member is provided between the opening end of the discharge cover and the cylindrical portion of the fixed scroll base plate. In the above scroll compressor, the sealing material is supported by an elastic body.

[0008]

With the above construction, the seal member is pushed upward by the pressing force of the elastic body when the compressor is in operation, so that the fixed scroll base plate tubular portion and the discharge cover opening end are closed. , While ensuring the function as a compressor, at the time of starting to lie down, the elastic body contracts due to the pressure of the high-pressure fluid in the discharge cover, creating a gap in the fitting portion,
As a result, at the time of starting to lie down, the fluid in the discharge cover is allowed to escape from the gap of the sealing material to the outside of the discharge space,
It is possible to prevent abnormal boosting.

[0009]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. The structure other than the essential part of the present invention is the same as that of the above-described conventional embodiment, and the description thereof is omitted. Also, common components are designated by the same reference numerals. FIG. 1 is a sectional view showing a main part of a scroll compressor according to the present invention. In FIG. 1, 1 is a shell, 10 is a cylindrical portion of a fixed scroll base plate, 11 is a discharge cover, 13 is a seal member, and 23 is an elastic body. The elastic body 23 presses the seal member 13 upward. Configured. Here, when the pressing force by the elastic body is f1, the force acting on the seal member 13 by the pressure of the high pressure fluid during normal compressor operation is f2, and the force acting on the seal member 13 by the pressure of the high pressure fluid at the time of start-up is f3. , The pressing force of the elastic body is set as follows. That is, f2> f
1 <f3.

When the inner diameter of the seal member is D1 and the diameter of the radial bottom portion 12b of the annular groove 12 of the base plate tubular portion 10 is D2, the dimensional relationship between these two members may be set as follows. It is a thing. That is, D2 <D1. Further, the outer shape of the seal member 13 is set to be larger than the inner diameter of the discharge cover 11 so that the seal member 13 exerts a pressing force in the radial direction at the time of fitting. Furthermore, the seal member 1
A spring or the like is used for the elastic body 23 that supports the plate 3, and they are provided at equal intervals inside the annular groove 12 of the base plate tubular portion 10.

According to such a structure, when the compressor is in operation, the seal member 13 is pressed against the upper end 12a of the annular groove 12 of the base plate tubular portion 10 by the pressing force of the elastic member 23, and the seal member 13 and the annular groove. The upper end 12a of 12 is sealed. Further, since the seal member 13 is configured to be pressed by the discharge cover 11, the outer peripheral portion 1 of the seal member 13 is
3a and the discharge cover 11 are sealed, and the opening between the discharge cover 11 and the base plate tubular portion 10 is closed.
The compressor 20 can function normally.

On the other hand, at the time of starting to lie down, the force f3 acting on the seal member 13 by the pressure of the high pressure fluid as shown in FIG.
Is larger than the pressing force of the elastic body, the seal member 13 moves downward. Therefore, the annular groove 12 of the base plate tubular portion 10
A gap is created between the upper end 12a of the nozzle and the seal member 13, and as shown by the broken line in FIG. 2, fluid such as liquid refrigerant leaks from the discharge cover into the internal space of the shell, resulting in abnormal pressure increase. No start failure occurs. Furthermore, plastic deformation of the discharge cover can be prevented.

In the above embodiment, the seal member 13 is composed of a ring body having a rectangular cross section, but as shown in FIG. 3, the seal member 13 has a trapezoidal cross section having a tapered surface. However, the same effect as that of the above-described embodiment may be obtained.

[0014]

As described above, according to the present invention, since the seal member is configured to be supported by the elastic member, it is possible to prevent an abnormal increase in pressure inside the discharge cover at the time of start-up of the bed, and thus, the start-up failure of the compressor. And the plastic deformation of the discharge cover can be prevented, and a highly reliable scroll compressor can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part showing a state at the time of starting to lie down according to an embodiment of the present invention.

FIG. 3 is an enlarged view of a main part showing another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a conventional scroll compressor.

FIG. 5 is a sectional view showing a main part of a conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shell 2 Discharge pipe hole 6 Oscillating scroll 6a Oscillating scroll base plate 6b Oscillating shaft 8 Fixed scroll 8b Discharge valve 9 Check valve 10 Base plate tubular part 11 Discharge cover 13 Seal member 23 Elastic body

Claims (1)

[Claims] 1. A shell having a discharge pipe hole opened in the axial direction, an orbiting scroll housed inside the shell and having an oscillation shaft at its end plate, and an end plate combined with this orbiting scroll. A fixed scroll having a discharge port,
A check valve attached to the fixed scroll for opening and closing the discharge port is provided, and a tubular portion is provided around the check valve so that the open end is fitted to the tubular portion. A cover is provided on the fixed scroll end plate and fixedly provided on the shell side, and a seal member is interposed between the fitting portion between the opening end of the discharge cover and the tubular portion of the fixed scroll base plate. A scroll compressor, wherein the sealing material is supported by an elastic body.