JP2000257559A - Compressor and discharge valve holder thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor provided with a discharge valve holder capable of reducing waste of a material without causing insufficiency of strength. SOLUTION: A thickness of a discharge valve holder 31 like a plate which extends along a leaf valve 8 for preventing reverse flow opposing to a discharge port 7 for discharging compressed gas and restricts bending of the leaf valve by its contact is changed in the direction of its extension. Preferably, the thickness of the discharge valve holder 31 is gradually reduced from a fixed end 32 toward a free end 33, and a degree of the change is determined in accordance with the distribution of bending moment applied at the time of operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a compressor and a discharge valve retainer generally provided therein.

[0002]

2. Description of the Related Art Compressors are widely used, for example, in air conditioning systems for automobiles. The compressor includes a compression mechanism for compressing a refrigerant gas to generate a compressed gas, and a discharge port for discharging the compressed gas to a discharge chamber. The compressed gas discharged to the discharge chamber further circulates through the refrigeration circuit, and returns to the compressor after condensation and expansion.

[0003] In a general compressor, a leaf valve is opposed to an outlet side of a discharge port in order to prevent a compressed gas from flowing backward from a discharge chamber to a compression mechanism. When the compressed gas is discharged from the compression mechanism to the discharge chamber, the leaf valve is pushed by the compressed gas to open the discharge port with bending, but otherwise closes the discharge port.

In order to prevent excessive bending and vibration of the leaf valve, a plate-shaped discharge valve holder called a valve retainer extending along the back surface of the leaf valve is provided. This discharge valve retainer allows the leaf valve to bend to some extent, but limits excessive deflection by contact with the leaf valve. The surface of the discharge valve retainer facing the leaf valve, that is, the valve receiving surface is formed corresponding to the shape of the bent leaf valve.

The conventional discharge valve retainer is usually provided as a cantilever, and has a constant thickness and width.
Further, as a special case, there is a discharge valve holder in which only the width is changed.

[0006]

Since the above-mentioned discharge valve retainer is provided as a cantilever, the required strength is not constant in the extending direction or the longitudinal direction. For this reason, in a discharge valve retainer having a constant thickness and width, insufficient strength is generated at a root portion, that is, a fixed portion, and material is wasted.

It is possible to match the strength by changing the width of the discharge valve retainer, but since the width acts only on the first order in terms of strength, it is inevitable that the material is wasted. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compressor having a discharge valve retainer capable of reducing material waste without insufficient strength.

Another object of the present invention is to provide a discharge valve holder capable of reducing material waste without causing insufficient strength.

[0010]

According to the present invention, there is provided a discharge port for discharging a compressed gas, a leaf valve for preventing backflow opposed to the discharge port, and a valve extending along the leaf valve. A compressor having a plate-shaped discharge valve retainer that restricts deflection of a leaf valve by abutment, wherein the discharge valve retainer has a thickness that changes in an extending direction thereof. Can be

The discharge valve retainer has a fixed end fixed thereto and a free end opposed to the fixed end in the extending direction. The thickness of the discharge valve retainer gradually increases from the fixed end to the free end. It may be decreasing.

[0012] The degree of change in the thickness of the discharge valve retainer may be determined according to the distribution of bending moment applied during operation.

Further, according to the present invention, a plate-like member extending along the backflow preventing leaf valve facing the discharge port for discharging the compressed gas of the compressor and restricting the deflection of the leaf valve by abutting. , Wherein the thickness of the discharge valve retainer changes in the direction in which the discharge valve retainer extends.

The discharge valve retainer has a fixed end fixed thereto and a free end opposed to the fixed end in the extending direction, and the thickness thereof gradually decreases from the fixed end toward the free end. Good.

[0015] The degree of the change in the thickness may be determined according to a distribution of a bending moment applied during operation.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a scroll compressor will be described as a compressor according to an embodiment of the present invention.

The illustrated scroll compressor is suitable for use in an air conditioning system for automobiles, and includes a fixed scroll 1 and a movable scroll 2 paired with the fixed scroll 1.
And a casing 3 containing these components, and a front housing 4 having one end fixed to the open end of the casing 3 and closed. The fixed scroll 1 and the movable scroll 2 together form a compression mechanism, and form some compression spaces 5 between them for compressing and transferring a fluid such as a refrigerant gas.

The fixed scroll 1 is fixed to the casing 3 with bolts or the like. A discharge chamber 6 is formed between the fixed scroll 1 and the casing 3. Fixed scroll 1
Has a discharge port 7 for discharging the fluid compressed in the compression space 5 to the discharge chamber 6. On the outlet side of the discharge port 7, a leaf valve 8 for preventing backflow, which is generally called a discharge valve, is provided.

Movable scroll 2 and front housing 4
Between them, there is provided a rotation preventing mechanism 9 for preventing rotation of the orbiting scroll 2 but allowing revolving. Further, the movable scroll 2 has an annular projection 11 integrally on the surface opposite to the fixed scroll 1. An eccentric bush 12 is rotatably disposed inside the annular protrusion 11 via a drive bearing 13.

The front housing 4 has a cylindrical portion 14 at the other end. A crankshaft 15 penetrates the cylindrical portion 14. The shaft 15 is the shaft bearing 1
6 and a main bearing 17 rotatably supported. The eccentric part 18 of the crankshaft 15 is engaged with the eccentric bush 12. Note that the shaft 15 is provided with a counterweight 19 that opposes the moment when the orbiting scroll 2 operates.

A rotor 22 is rotatably supported outside the cylindrical portion 12 of the front housing 4 via a radial bearing 21. The rotor 22 is driven to rotate by, for example, an automobile engine. The rotor 22 is connected to the shaft 15 via an electromagnetic clutch 23. Therefore, when the electromagnetic clutch 23 is on, the armature 24 thereof is attracted to the shaft end face of the rotor 21 and the shaft 15 rotates integrally with the rotor 22, but when the electromagnetic clutch 23 is off, the armature 24 is separated from the rotor 22. When separated, the shaft 15 is separated from the rotor 22.

When the shaft 15 rotates, the movable scroll 2 revolves on a circular orbit by the action of the eccentric portion 19 and the eccentric bush 12. At this time, the rotation of the orbiting scroll 2 is stopped by the rotation preventing mechanism 9. As a result, the compression space 5 is transferred to the center while compressing the refrigerant gas, and the fluid is discharged to the discharge chamber 6 with the deflection of the leaf valve 8 through the discharge port 7. The refrigerant gas in the discharge chamber 6 flows out of the discharge port (not shown) to the refrigeration circuit, condenses or evaporates, returns to the inside of the casing 3 from the inflow port (not shown), and is taken into the compression space 5. .

In order to prevent excessive deflection and vibration of the leaf valve 8, a plate-shaped discharge valve holder 31 extending along the back surface of the leaf valve 8 is provided. This discharge valve holder 31
The second embodiment allows the leaf valve 8 to bend to some extent, but restricts excessive bending by contact with the leaf valve 8.

The discharge valve holder 31 will be described with reference to FIGS. The discharge valve retainer 31 has a fixed end 32 fixed to the fixed scroll 1 and a free end 33 opposed to the fixed end 32 in the extending direction. The thickness of the discharge valve retainer 31 gradually decreases from the fixed end 32 to the free end 33. Since such a discharge valve holder 31 can be easily manufactured by forging, there is no problem in manufacturing cost.

The degree of change in the thickness of the discharge valve holder 31 is preferably determined according to the distribution of the bending moment applied to the discharge valve holder 31 during operation of the scroll compressor. Here, the thickness of the discharge valve retainer 31 is changed by the ratio of the cube root of the bending moment distribution. The surface of the discharge valve retainer 31 facing the leaf valve 8, that is, the valve receiving surface 34 is formed so as to correspond to the bent shape of the leaf valve 8.

According to the discharge valve holder 31, the weight can be easily reduced, and the amount of material is small, which is advantageous in saving resources.

[0027]

As described above, according to the present invention,
A compressor provided with a discharge valve retainer capable of reducing material waste without insufficient strength can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor as a compressor according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the scroll compressor of FIG.

FIG. 3 is a plan view of FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fixed scroll 2 movable scroll 3 casing 4 housing 5 compression space 6 discharge chamber 7 discharge port 8 leaf valve 9 rotation prevention mechanism 15 crankshaft 22 rotor 23 electromagnetic clutch 24 armature 31 discharge valve holder 32 fixed end 33 free end 34 valve receiver surface

Claims (6)

[Claims] 1. A discharge port for discharging a compressed gas, a leaf valve for preventing backflow facing the discharge port, and extending along the leaf valve to restrict deflection of the leaf valve by contact. In a compressor having a plate-shaped discharge valve retainer,
The compressor, wherein the thickness of the discharge valve retainer changes in the direction in which the discharge valve retainer extends. 2. The discharge valve retainer has a fixed end fixed thereto and a free end opposed to the extending end in the extending direction, and the thickness of the discharge valve retainer is from the fixed end to the free end. 2. The compressor according to claim 1, wherein said compressor gradually decreases. 3. The compressor according to claim 2, wherein the degree of change in the thickness of the discharge valve retainer is determined according to a distribution of a bending moment applied during operation. 4. A plate-shaped discharge valve retainer extending along a backflow-preventing leaf valve facing a discharge port for discharging compressed gas of a compressor and restricting deflection of the leaf valve by contact. Wherein the thickness of the discharge valve retainer varies in the direction in which the discharge valve extends. 5. The discharge according to claim 4, further comprising a fixed end fixed and a free end opposed to the fixed end in the extending direction, wherein a thickness gradually decreases from the fixed end toward the free end. Valve retainer. 6. The discharge valve retainer according to claim 5, wherein the degree of the change in the thickness is determined according to a distribution of a bending moment applied during operation.