JP2001329962A - Discharge valve device for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge valve device which is provided with a valve plate with a discharge port, a lead valve fixed to the valve plate in a cantilever state and elastically deformed to a surface outward direction to open/close the discharge port and a retainer for restricting an open degree of the lead valve and in which a noise is not generated at the high speed operation of a compressor. SOLUTION: The discharge valve device is provided with a valve plate with a discharge port; a lead valve fixed to the valve plate in a cantilever state and elastically deformed to a surface outward direction to open/close the discharge port; and a retainer for restricting an open degree of the lead valve. The retainer has a first retainer for restricting an open degree of the lead valve and a second lead valve which does not interrupt an abutting of the lead valve to the first retainer although it is abutted to the lead valve prior to the first retainer during opening of the lead valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge valve device for a compressor.

[0002]

2. Description of the Related Art A valve plate having a discharge port, a reed valve which is fixed to the valve plate in a cantilever state and elastically deforms in an out-of-plane direction to open and close the discharge port, and a retainer which regulates the opening of the reed valve. A discharge valve device of a compressor having the following is widely used.

[0003]

In the conventional discharge valve device, the amount of deformation of the reed valve at the time of opening the valve is reduced because the duration of one discharge becomes very small during high-speed operation of the compressor. There was a problem that the valve repeatedly opened and closed and vibrated in a cantilevered state without contacting the retainer, thereby generating noise.
The present invention has been made in view of the above problems, and a valve plate having a discharge port formed therein, and a reed valve which is fixed to the valve plate in a cantilever state and elastically deforms in an out-of-plane direction to open and close the discharge port. It is an object of the present invention to provide a discharge valve device of a compressor including a retainer that regulates an opening of a reed valve, wherein the discharge valve device does not generate noise when the compressor operates at a high speed.

[0004]

In order to solve the above-mentioned problems, according to the present invention, a valve plate having a discharge port formed therein is fixed to the valve plate in a cantilever state and elastically deformed in an out-of-plane direction. A reed valve that opens and closes the outlet, and a retainer that regulates the opening of the reed valve, wherein the retainer regulates the opening of the reed valve and a first retainer that opens the reed valve before the first retainer A discharge valve device for a compressor, comprising: a second reed valve that contacts a reed valve but does not prevent the reed valve from contacting the first retainer. In the discharge valve device for a compressor according to the present invention, since the second retainer that comes into contact with the reed valve before the first retainer is provided when the reed valve is opened, the reed valve is operated during high-speed operation of the compressor. The reed valve contacts the second retainer even if the amount of deformation of the reed decreases. As a result, it is possible to prevent a situation in which the reed valve repeatedly opens and closes and vibrates in a cantilevered state without contacting the retainer, thereby preventing generation of noise. Since the second retainer does not prevent the reed valve from contacting the first retainer, the reed valve can be sufficiently out-of-plane to a position where it contacts the first retainer at a high flow rate. As a result,
At a high flow rate, a sufficient reed valve opening is secured.

[0005] In a preferred aspect of the present invention, the second retainer is a leaf spring. The second retainer can be easily formed by the leaf spring.

In a preferred aspect of the present invention, the second retainer approaches the reed valve beyond the first retainer through a notch formed in the first retainer. In a preferred aspect of the present invention, the second retainer approaches the reed valve beyond the first retainer on the side of the first retainer. Second
The retainer moves over the first retainer via a notch formed in the first retainer and approaches the reed valve, or approaches the reed valve beyond the first retainer on the side of the first retainer. Can be brought into contact with the reed valve earlier than the first retainer when the valve is opened.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A piston reciprocating compressor having a discharge valve device according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, both ends of a cylindrical housing 1 are closed by a front housing 2 and a rear housing 3. Inside the housing 1, a crank chamber 4 and a plurality of cylinder bores 5 arranged at intervals in the circumferential direction are formed. In the crankcase 4,
A swash plate 6 is provided. A drive shaft 7 is inserted through the center of the swash plate 6. The drive shaft 7 is rotatably supported by the front housing 2 and the housing 1 via bearings 8a and 8b. The rotor 9 is fixed to the drive shaft 7. A hole 9 a is formed at the tip of the rotor 9. The rotor 9 is supported by the front housing 2 via a thrust bearing 10. The swash plate 6 has an ear 11 extending toward the rotor 9. An elongated hole 11 a is formed in the ear 11. The swash plate 6 and the rotor 9 are connected by the pins 12 inserted into the elongated holes 11a and the holes 9a.

A swing plate 15 is rotatably supported on the swash plate 6 via a thrust bearing 13 and a radial bearing 14. A plurality of spherical seats 15a are formed on the swing plate 15 at intervals in the circumferential direction. One end 16 a of the piston rod 16 is pivotally connected to the spherical seat 15.
a. The other end 16b of the piston rod 16
Are pivotally fitted to a spherical seat 17 a formed on the piston 17. The piston 17 is slidably fitted in the cylinder bore 5. A rotation preventing device 18 for preventing rotation of the rocking plate 15 is provided.

In the rear housing 3, a suction chamber 19 and a discharge chamber 20 are defined. A valve plate 21 is disposed between the housing 1 and the rear housing 3.
The valve plate 21 has a suction port 21 facing the cylinder bore 5.
a and the discharge port 21b are formed. Inlet 21a
And a discharge valve 23 that opens and closes the discharge port 21b. The discharge valve 23 is fixed to the valve plate 21 in a cantilever state. The suction valve 22 and the discharge valve 23
Due to the pressure difference between the inside and outside, the inlet 21
a, is configured as a reed valve that opens and closes the discharge port 21b.

[0010] As shown in FIGS.
A retainer 24 that regulates the opening of the discharge valve 23 is provided. The retainer 24 approaches the discharge valve 23 beyond the first retainer 24a via a first retainer 24a for regulating the opening of the discharge valve 23 and a notch 24a 'formed in the first retainer 24a. When the valve 23 is opened, the second retainer 2 contacts the discharge valve 23 before the first retainer 24a.
4b. The first retainer 24a and the second retainer 24b are fixed to the valve plate 21. The second retainer 24b is configured as a leaf spring made of a thin metal plate.

A clutch device 25 is mounted on the front housing 2. The piston reciprocating compressor according to this embodiment having the above configuration is mounted on a vehicle and used as a refrigerant compressor of a cooling device. Clutch device 2
Reference numeral 5 is connected to a crankshaft of a vehicle engine (not shown) via a belt (not shown).

The operation of the piston reciprocating compressor will be described below. By turning on the clutch device 25, the piston reciprocating compressor is driven by the on-board engine. The drive shaft 7 rotates, and the swash plate 6 rotates with the rotation of the drive shaft 7. The swing plate 15 swings with the rotation of the swash plate 6. The rotation of the rocking plate 15 is stopped by the rotation stopping device 18. As the swinging plate 15 swings, the piston 17
Reciprocates in the bore 5. As the piston 17 reciprocates, the refrigerant gas flowing from the external cooling circuit into the suction chamber 19 is sucked into the bore 5 through the suction port 21a and the suction valve 22, is compressed in the bore 5, and is discharged into the bore 5. The gas is discharged into the discharge chamber 20 through the discharge valve 21b and the discharge valve 23, and flows out of the discharge chamber 20 to an external cooling circuit.

The opening of the discharge valve 23 is regulated by the retainer 24, thereby preventing the discharge valve 23 from being damaged by excessive deformation. When the piston reciprocating compressor is operated at a low speed or a high flow rate, the discharge valve 23 is elastically deformed in the out-of-plane direction by receiving the discharge pressure when the piston is opened. Second retainer 24
Since b is approaching the discharge valve 23 beyond the first retainer 24a via the notch 24a 'formed in the first retainer 24a, the discharge valve 23 first contacts the second retainer 24b. The discharge valve 23 increases the amount of deformation while elastically deforming the second retainer 24b in the out-of-plane direction, and stops as it contacts the first retainer 24a as shown in the left half of FIG. The second retainer 24b is a leaf spring made of a thin metal plate, is elastically deformable, and does not prevent the discharge valve 23 from contacting the first retainer 24a. Therefore, the discharge valve 23 contacts the first retainer 24a. It can be sufficiently out-of-plane deformed to the position. As a result, a sufficient opening degree of the discharge valve 23 is secured during a high flow rate operation in which the load of the cooling device is high, and a sufficient refrigerant discharge amount is secured. During high-speed operation of the present piston reciprocating compressor, the discharge duration of one discharge becomes very small, so that the amount of deformation of the discharge valve 23 when the valve is opened decreases. However, since the second retainer 24b that contacts the discharge valve 23 before the first retainer 24a is provided, even if the amount of deformation of the discharge valve 23 decreases during high-speed operation of the compressor, the discharge valve 23 remains It contacts the second retainer 24b. As a result, it is possible to prevent a situation in which the discharge valve 23 repeatedly opens and closes and vibrates in a cantilevered state without contacting the retainer, thereby preventing noise.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. As shown in FIG.
The retainer 34b is formed bifurcated, and the first retainer 34a is located on the side of the first retainer 34a with the first retainer 34a interposed therebetween.
And may be made to approach the discharge valve beyond. Second retainer 34
b can contact the discharge valve before the first retainer 34a when the discharge valve is opened, and does not prevent the discharge valve from contacting the first retainer 34a. As shown in FIG.
A recess 44a 'is formed in the first retainer 44a,
A second retainer 44b composed of a coil spring protruding toward the discharge valve 23 may be provided in a '. With such a configuration, the same effect as that of the second retainer 24b in the above embodiment can be obtained. However, structurally, the second retainer 24b made of a leaf spring is simpler. The discharge valve device according to the present invention is applicable to all types of compressors having a discharge valve formed of a reed valve.

[0015]

As described above, in the discharge valve device for a compressor according to the present invention, the second retainer is provided which comes into contact with the reed valve prior to the first retainer when the reed valve is opened. Therefore, even if the amount of deformation of the reed valve decreases during high-speed operation of the compressor, the reed valve contacts the second retainer. As a result, it is possible to prevent a situation in which the reed valve repeatedly opens and closes and vibrates in a cantilevered state without contacting the retainer, thereby preventing generation of noise. Since the second retainer does not prevent the reed valve from contacting the first retainer,
At a high flow rate, the reed valve can be sufficiently out-of-plane deformed to a position where it contacts the first retainer. As a result, at a high flow rate, a sufficient reed valve opening is ensured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a piston reciprocating compressor including a discharge valve device according to an embodiment of the present invention.

FIG. 2 is a front view of a discharge valve device of the compressor according to the embodiment of the present invention.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2; The right half shows the state where the discharge valve is closed, and the left half shows the state where the discharge valve is opened to the maximum opening.

FIG. 4 is a front view of a discharge valve device of a compressor according to another embodiment of the present invention.

FIG. 5 is a sectional view of a discharge valve device of a compressor according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 housing 6 swash plate 7 drive shaft 17 piston 19 suction chamber 20 discharge chamber 21b discharge port 24 retainer 24a, 34a, 44a first retainer 24b, 34b, 44b second retainer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H003 AA03 AB07 AC03 AD01 CA01 CA02 CB07 CC11 CD02 CD03 CD04 3H058 AA15 BB35 CD04 CD07 EE13

Claims (4)

[Claims] 1. A valve plate having a discharge port formed therein, a reed valve fixed to the valve plate in a cantilevered state and elastically deforming in an out-of-plane direction to open and close the discharge port, and a retainer for regulating an opening of the reed valve. A first retainer that regulates the opening of the reed valve, and a retainer that contacts the reed valve earlier than the first retainer when the reed valve is opened, but prevents the reed valve from contacting the first retainer. A discharge valve device for a compressor, comprising: a second reed valve that does not interfere. 2. The discharge valve device for a compressor according to claim 1, wherein the second retainer is a leaf spring. 3. The discharge of a compressor according to claim 1, wherein the second retainer approaches the reed valve beyond the first retainer through a notch formed in the first retainer. Valve device. 4. The discharge valve device for a compressor according to claim 1, wherein the second retainer approaches the reed valve beyond the first retainer on a side of the first retainer.