JP2003328964A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor wherein reverse rotation is prevented, and noises occurring near a check valve is reduced by forming the check valve of an elastic plate, by pinching the check valve with a back surface of a fixed scroll and a valve holder, by forming a small gap in a pinched portion for communication between the inside of the valve holder and a discharge chamber and by quickly closing the check valve. <P>SOLUTION: The scroll compressor has a turning scroll defining a plurality of compression chambers together with a fixed scroll 4 with their laps meshed with each other, a check valve 11 for opening and closing a discharge port 4b formed in the fixed scroll 4, and the valve holder 12 covering the check valve 11 for regulating its valve opening height. In this compressor, the check valve 11 is formed of the elastic plate in a flat plate shape. Opposite ends in a longitudinal direction of the check valve are pinched by the back surface of the fixed scroll 4 and the valve holder 12. A communication aperture 15 is formed in the pinched portion 13 for communication between the inside of the valve holder 12 and the discharge chamber. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more specifically, it is provided at a discharge port of a fixed scroll.
The present invention relates to a discharge valve and a valve retainer structure that prevent a backflow of discharge gas.

[0002]

2. Description of the Related Art A conventional scroll compressor of this type will be described with reference to FIG. 7 which is a sectional view thereof and FIG. 8A which is an enlarged sectional view of a main portion thereof. In the scroll compressor, a compression unit 2 and an electric motor 3 are arranged vertically inside a closed container 1, and the compression unit 2 meshes with a spiral scroll fixed scroll 4 and the fixed scroll 4 to form a plurality of compression chambers. 5
A swivel scroll 6 that forms a swirl scroll, an Oldham ring 7 that prevents the swivel scroll 6 from rotating, and a shaft 8 that swivels by inserting a swivel shaft 8a formed at the tip into the boss portion 6a of the swivel scroll 6, It comprises a main frame 9 supporting a main shaft 8b formed at the lower part of the turning shaft 8a.

When the electric motor 3 rotates, the orbiting scroll 6 is moved by the orbiting shaft 8a formed at the tip of the shaft 8.
The Oldham ring 7 makes a turning motion while preventing rotation. The low-pressure refrigerant sucked from the suction pipe 51 into the compression section 2 by the orbiting movement of the orbiting scroll 6 is compressed while moving sequentially from the outer peripheral portion of the compression chamber 5 to the central portion thereof, and becomes the high-pressure refrigerant gas. Is discharged from the discharge port 4b to the discharge chamber 10 via the discharge port 4b and then discharged from the discharge pipe 52 to the outside of the closed container 1.

In the above, immediately after the compression is stopped, the discharged high-pressure refrigerant gas in the discharge chamber 10 flows back to the compression chamber 5 having a pressure lower than the high pressure, and the orbiting scroll 6 is rotated in the reverse direction to generate a large impact noise and damage to parts. I will let you. In order to prevent this, a check valve 11 'is provided at the discharge port 4b of the fixed scroll 4. In the above-described conventional compressor, as shown in FIG. 8A, a flat-plate check valve 11 'that moves vertically in the axial direction is provided between the fixed scroll 4 and the valve retainer 12'. In this case, when compression is stopped, the check valve 11 'mainly falls due to its own weight and closes the discharge port 4b to prevent the orbiting scroll 6 from reversing.

Further, as shown in FIG. 8 (B), the check valve 1
1 "and a valve retainer 12" for restricting the maximum opening of the check valve 11 "are overlapped with each other. There is a valve system. In this case, when compression is stopped, the discharge port 4b is immediately closed by the elastic force of the check valve 11 '' to prevent the orbiting scroll 6 from reversing. However, in the case of dropping due to its own weight in FIG. 8 (A), it takes time until the discharge port 4b is closed, and there is a problem that reverse rotation occurs during that time. Further, in the case of the lead valve system shown in FIG. 8 (B), although the discharge port 4b can be closed immediately by the elastic force when the compressor is stopped, the reverse rotation can be prevented, but the check valve 11 '' opens when the compressed gas is discharged, Since it is closed, there has been a problem that a pulsating sound caused by a sudden opening / closing operation of the check valve 11 ″ and a collision sound of the check valve 11 ″ are generated.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a check valve is formed by an elastic plate, and the check valve is clamped by a fixed scroll back surface and a valve retainer, and a valve is provided in the clamp portion. A communication hole that connects the inside of the presser and the discharge chamber is provided,
An object of the present invention is to provide a scroll compressor that can quickly close the check valve to prevent reverse rotation and reduce noise generated near the check valve.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a fixed scroll having a spiral wrap on its end plate and a plurality of compression chambers meshed with the fixed scroll are provided. Orbiting scroll to form,
A plate-like check valve that is formed in the central portion of the fixed scroll and that is disposed at the discharge port of the discharge hole that discharges the gas compressed in the compression chamber to the discharge chamber and that opens and closes the discharge port In a scroll compressor that covers a stop valve and includes a valve retainer that regulates the opening height of the stop valve, the check valve is formed of an elastic material into a flat plate shape, and both ends of the check valve in the longitudinal direction are formed as described above. The fixed scroll is sandwiched between the back face of the end plate and the valve retainer, the sandwiching portion is fixed to the fixed scroll by a fastening member, and the sandwiching portion is provided with a communication hole that communicates the inside of the valve retainer with the discharge chamber. It is configured as follows.

Further, the communication hole is constituted by a groove provided on the bottom surface of the valve retainer.

Further, the communication hole is constituted by a groove provided on the rear surface of the end plate of the fixed scroll.

Further, the communication hole is composed of a groove provided on the bottom surface of the valve retainer and a groove provided on the rear surface of the end plate of the fixed scroll facing the groove.

Further, the communication hole is formed by a spacer provided between the valve retainer and the rear surface of the end plate of the fixed scroll.

The check valve is provided with an insertion hole or a notch for inserting the fastening member, and the check valve is positioned.

Further, the spacer is fitted in the insertion hole or the notch.

The spacer is formed integrally with the valve retainer.

The check valve opens and closes the discharge port,
It is composed of a circular portion having a diameter larger than the diameter of the discharge port, and a skirt portion extending leftward and rightward from the circular portion and having a width narrower than the diameter of the circular portion.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a vertical sectional view of a scroll compressor according to the present invention, FIG. 2 is an enlarged view of a main part of the present invention, (A) is a sectional view when the compressor is stopped, (B) is a side view of (A), C) is a cross-sectional view during operation of the compressor, FIG.
[Fig. 3] is an exploded perspective view of essential parts in the present invention. In the figure,
A compression unit 2 and an electric motor 3 are arranged vertically in a closed container 1, and the compression unit 2 swirls a spiral fixed scroll 4 and a plurality of compression chambers 5 that mesh with the fixed scroll 4 to form a plurality of compression chambers 5. The scroll 6, the Oldham ring 7 for preventing the orbiting scroll 6 from rotating, the shaft 8 for orbiting by inserting the orbiting shaft 8a formed at the tip into the boss portion 6a of the orbiting scroll 6, and the orbiting shaft 8a. And a main frame 9 supporting a main shaft 8b formed in the lower part of the.

The discharge port 4b of the discharge hole 4a formed in the central portion of the fixed scroll 4 for discharging the gas compressed in the compression chamber 5 to the discharge chamber 10 is opened and closed to stop the compressor. A check valve 11 for preventing backflow of compressed gas from the discharge chamber 10 to the compression chamber 5 and a valve retainer 12 for covering the check valve 11 and restricting the valve opening height are arranged. . The check valve 11 is formed of an elastic material into a flat plate, and both ends of the check valve 11 in the longitudinal direction are clamped by the rear face of the fixed scroll 4 and the valve retainer 12, and the clamp portion 13 is fixed by the fixed scroll. 4 is fixed by a fastening member with a screw 14, and the holding portion 13 is provided with a communication hole 15 for communicating the inside of the valve retainer 12 and the discharge chamber 10.

In the above structure, when the compressor is operated, the low pressure refrigerant sucked from the suction pipe 51 into the suction chamber 5a of the compression section 2 by the orbiting motion of the orbiting scroll 6 is compressed.
The compressed high-pressure refrigerant gas while moving from the outer peripheral part to the central part, and the refrigerant gas is discharged through the discharge hole 4a.
4b hits the check valve 11 by pressure and opens the valve.
And the check valve 11 is attached to the valve retainer 12, and at the same time, the refrigerant gas is discharged into the discharge chamber 10. Then, the refrigerant is discharged from the discharge pipe 52 to the outside of the closed container 1. When the compressor is stopped, pressure is exerted on the compression chamber 5 which is lower than the high pressure of the discharge chamber 10, and the check valve 11 is lowered by the elastic action and smoothly closed in contact with the discharge port 4b to close the compression chamber 5 of the refrigerant. It is possible to eliminate the reverse flow to and to prevent the orbiting scroll 6 from reversing.

In the present invention, the check valve 11 is sandwiched between the rear face of the end plate of the fixed scroll 4 and the valve retainer 12 with the communication hole 15 maintained. The buffer force (damper action) can be exerted by the shearing force due to the viscosity of the lubricating oil entering the communication hole 15, and the elastic deformation of the check valve 11 is moderated to suppress the sudden opening / closing operation, and the check valve It is possible to prevent the expansion noise and the collision noise generated in the vicinity of 11. Further, when the compressor is stopped, the check valve 11 promptly returns to the natural state by the force of returning to the natural state.
Can be closed and reversal can be prevented.

FIG. 4 shows each embodiment of the communication hole 15, (A) is a top view of the valve retainer 12 as seen from above, (B)
7A to 7E are cross-sectional views taken along the line AA ′ of FIG. 4B shows the communication hole 15 formed by a groove provided on the bottom surface of the valve retainer 12, and FIG. 4C shows a groove formed on the rear surface of the end plate of the fixed scroll 4. . Further, FIG. 4D shows that the communication hole 15 is formed by a groove provided on the bottom surface of the valve retainer 12 and a groove provided on the rear surface of the end plate of the fixed scroll 4 facing the groove. By configuring the communication hole 15 as described above, the cross-sectional area and length of the communication hole 15 are changed, and the resistance value thereof is changed, whereby the buffer value can be arbitrarily set.

Further, FIG. 4 (E) shows the communication hole 15 formed by a spacer 16 provided between the valve retainer 12 and the back face of the end plate of the fixed scroll 4, and the height of the spacer 16 is changed. By doing so, the buffer value can be arbitrarily set as in the above. By forming the spacer 16 integrally with the valve retainer 12, processing is easy and cost effective.

FIG. 5 shows an embodiment for preventing positional deviation of the check valve 11 in the present invention. Figure 5 (
A) is a cutout 11a for inserting the screw 14 into the check valve 11.
Is provided to prevent the check valve 11 from being displaced in the front-rear direction, as indicated by the arrow. In FIG. 5B, the check valve 11 is provided with an oval through hole 11b through which the screw 14 is inserted to prevent the check valve 11 from being displaced in the front-rear direction and to prevent the check valve 11 from being displaced. The valve 11 is configured to operate substantially evenly on the right and left sides, and the amount of movement to one side is restricted.

Further, FIG. 5 (C) is for preventing the check valve 11 from being displaced in the left-right direction, and FIG. 5 (D) is for (C).
It is a BB 'sectional view. In this case, when the check valve 11 is fully opened, there is a gap between the left and right ends of the check valve 11 and the valve retainer 12.
11c is formed so that the left and right ends of the check valve 11 and the valve retainer 12 are in contact with each other in a fully closed state to prevent the check valve 11 from shifting in the left-right direction (arrow in the figure). is there.

Further, as shown in FIG. 6, the check valve 11 opens and closes the discharge port 4b and has a circular portion 11d having a diameter R larger than the diameter of the discharge port 4b and extending from the circular portion 11d to the left and right. Then
The non-return valve is constituted by a skirt portion 11e (width W) having a width narrower than the diameter R of the circular portion 11d.
The elastic force of 11 can be properly controlled at the time of design, and the force to open (lift) the check valve 11 at the time of discharge can be reduced.

Next, a method of assembling the check valve 11 in the above structure will be described with reference to FIG. Screw holes 12a for inserting screws 14 are provided on both left and right sides of the valve retainer 12, and screw holes 4c for screwing the screws 14 are provided at positions corresponding to the screw holes 12a on the rear surface of the end plate of the fixed scroll 4. The screw 14 is inserted into the screw hole 12a and the notch 11a (or the insertion hole 11b) of the check valve 11, the screw 14 is screwed into the screw hole 4c, and the valve retainer 12 and the check valve 11 are inserted. The fixed scroll 4
Fix it to the back of the end plate. The spacer 16 may be fitted in the insertion hole 11b or the notch 11a.

As described above, the check valve 11 is formed of an elastic plate, and the check valve 11 is sandwiched between the back surface of the fixed scroll 4 and the valve retainer 12, and the sandwiching portion 13 discharges the inside of the valve retainer 12 and the discharge. By providing the communication hole 15 that communicates with the chamber 10, the communication hole
15 The damping force (damper action) can be exerted by the shear force due to the viscosity of the lubricating oil entering the check valve 11.
The elastic deformation of the is slowed down to suppress the sudden opening / closing operation, and the check valve 11 is closed promptly to prevent the reverse rotation and the check valve.
The scroll compressor can reduce the noise generated in the vicinity of 11.

[0027]

As described above, in the present invention, the check valve is formed by the elastic plate, and the check valve is sandwiched between the back surface of the fixed scroll and the valve retainer, and the sandwiching portion is provided with the inside of the valve retainer and the discharge chamber. By providing a communication hole that communicates with each other, the check valve can be closed promptly, reverse rotation can be prevented, and noise generated near the check valve can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a scroll compressor showing an embodiment of the present invention.

FIG. 2 is an enlarged view of an essential part showing an embodiment of the present invention, in which (A) is a sectional view when the compressor is stopped, (B) is a side view of (A),
(C) is a cross-sectional view during operation of the compressor.

FIG. 3 is an exploded perspective view of essential parts showing an embodiment of the present invention.

FIG. 4 shows each embodiment of the communication hole according to the present invention, in which (A) is a top view of the valve retainer as seen from above, and (B)-
(E) is a sectional view taken along the line AA ′ of (A).

FIG. 5 shows an embodiment for preventing positional deviation of the check valve in the present invention, (A) is a top view with a notch,
(B) is a top view in which an insertion hole is provided, (C) is a cross-sectional view for preventing positional deviation in the left-right direction, and (D) is a BB 'cross-sectional view of (C).

FIG. 6 is an enlarged top view of essential parts showing another embodiment of the check valve according to the present invention.

FIG. 7 is a vertical cross-sectional view of a scroll compressor showing an outline of a conventional example.

FIG. 8 is an enlarged cross-sectional view of a main part according to a conventional example, in which (A) is a first embodiment and (B) is a second embodiment.

[Explanation of symbols]

1 closed container 2 Compressor 3 electric motor 4 fixed scroll 4a Discharge hole 4b outlet 4c screw hole 5 compression chamber 6 orbiting scroll 6a Boss part 7 Oldham ring 8 shafts 8a swivel axis 8b spindle 9 mainframe 10 Discharge chamber 11 Check valve 11a cutout 11b insertion hole 11c gap 11d circular part 11e Skirt part 12 valve retainer 12a screw hole 13 Clipping part 14 screws 15 communication holes 16 spacer 52 Inhalation tube 52 Discharge pipe

Claims (9)

[Claims] 1. A fixed scroll having a spiral wrap on an end plate, an orbiting scroll that meshes with the fixed scroll to form a plurality of compression chambers, and a fixed scroll formed in the center of the fixed scroll. Is installed at the discharge port of the discharge hole that discharges the gas compressed by the discharge chamber, and the plate-like check valve that opens and closes the discharge port and covers the check valve and regulates the valve opening height. In a scroll compressor provided with a valve retainer, the check valve is formed in a flat plate shape with an elastic material, and both longitudinal ends of the check valve are sandwiched between the end plate back surface of the fixed scroll and the valve retainer, The scroll compressor, wherein the holding portion is fixed to the fixed scroll by a fastening member, and the holding portion is provided with a communication hole that connects the inside of the valve retainer and the discharge chamber. 2. The scroll compressor according to claim 1, wherein the communication hole is a groove provided on a bottom surface of the valve retainer. 3. The scroll compressor according to claim 1, wherein the communication hole comprises a groove provided on a rear surface of the end plate of the fixed scroll. 4. The scroll compression according to claim 1, wherein the communication hole includes a groove provided on a bottom surface of the valve retainer and a groove provided on a rear surface of an end plate of the fixed scroll facing the groove. Machine. 5. The scroll compressor according to claim 1, wherein the communication hole is formed by a spacer provided between the valve retainer and the back face of the end plate of the fixed scroll. 6. The scroll compressor according to claim 5, wherein the spacer is formed integrally with the valve retainer. 7. The scroll compressor according to claim 1, wherein the check valve is provided with an insertion hole or a notch for inserting the fastening member, and the check valve is positioned. 8. The scroll compressor according to claim 5, wherein the spacer is fitted in the insertion hole or the notch. 9. The check valve opens and closes the discharge port, has a circular portion having a diameter larger than the diameter of the discharge port, and a skirt portion that extends laterally from the circular portion and has a width narrower than the diameter of the circular portion. The scroll compressor according to claim 1, wherein the scroll compressor is formed of: