JPH09250461A - Valve plate device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve plate device with its superior volume efficiency and cost efficiency capable of alleviating the shock force of a blow-out valve. SOLUTION: A valve plate device 1 comprises including a piston arranged on the top of a cylinder inserted so as to ensure reciprocating movement freely, a valve plate 2 having a blow-out hole 20 formed in response to the cylinder, a blow-out valve 3 mounted on the valve plate 2 and opening or closing the blow-out hole 20, and a retainer 4 for restricting the lift quantity in the open direction of the blow-out valve 3. In this case, a spacer 5 having a curved face 51a gradually approaching to the valve plate 2 as the spacer goes to the tip end is intervened between the valve plate 2 and the blow-out valve 3, when the blow-out valve 3 is closed the blow-out valve 3 comes into contact with the curved face 51a sequentially from its fixed side, so that the blow-out hole 20 is closed finally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve plate device used in a fluid machine having a piston such as a swash plate compressor.

[0002]

2. Description of the Related Art A conventional general valve plate device is shown in FIG.
The valve plate device 1 is arranged at the top of a cylinder (not shown) into which a piston (not shown) is reciprocally inserted.
Further, a valve plate 2 having a discharge hole 20 formed corresponding to a cylinder, a discharge valve 3 provided on the valve plate 2 for opening and closing the discharge hole 20, and a discharge valve provided on the discharge valve 3 are provided. The retainer 4 for controlling the lift amount of the valve 3 in the opening direction is included.

This valve plate device 1 has a problem that when the discharge valve 3 is closed, a large vibration and noise are generated due to the impact force when the discharge valve 3 contacts the valve plate 2.

In order to solve this problem, as shown in FIG. 6, the valve plate device 1 in which the valve plate 2 is provided with the curved surface 25, or as shown in FIGS. A valve plate device 1 having a tip portion bent toward the retainer 4 was invented.

[0005]

However, in the valve plate device shown in FIG. 6, the impact force when the discharge valve collides with the valve plate is considerably reduced as compared with the valve plate device shown in FIG.
The valve plate 2 having the curved surface 25 has to be manufactured by press working, and in this case, a pressing device needs to be considerably large, which causes a problem of high manufacturing cost. Moreover, the smoothness of the curved surface formed by press working, that is, the sealing surface is low, and the sealing property when the valve is closed is not high.

Further, the valve plate device 1 shown in FIGS. 7 and 8 is
Although the effect of mitigating the impact force of the discharge valve 3 can be expected, since the discharge valve 3 is plastically deformed in advance, the discharge valve 3 can be formed only by the pressure difference between the cylinder side and the discharge valve side of the valve plate 2. 3 is insufficient to bring the valve 3 into contact with the valve plate 2 against the elastic force of the bent portion, and therefore the valve closing performance is low, and accordingly, the volume efficiency is low. there were.

Therefore, it is an object of the present invention to provide a valve plate device which can reduce the impact force of the discharge valve, is excellent in volumetric efficiency, and is low in cost.

[0008]

According to the invention as set forth in claim 1, a valve is arranged at the top of a cylinder in which a piston is reciprocally inserted, and has a discharge hole formed corresponding to the cylinder. A valve plate device including a plate, a discharge valve provided on the valve plate for opening and closing the discharge hole, and a retainer provided on the discharge valve for restricting a lift amount of the discharge valve in an opening direction, A spacer having a curved surface gradually approaching the valve plate is interposed between the valve plate and the discharge valve, and when the discharge valve is closed, the discharge valve is sequentially fixed from its fixed side. Abut the curved surface,
Finally, a valve plate device characterized in that the discharge hole is closed is obtained.

According to the second aspect of the present invention, the discharge valve has a fixed portion, a swinging portion, and an opening / closing portion, the fixed portion is fixed on the spacer, and the swinging portion comprises: The opening / closing portion is a flat portion that is connected to the fixed portion and is in contact with and separated from the spacer, and the opening / closing portion is a flat portion that opens / closes the discharge hole, and is formed to be slightly larger than the discharge hole.
Further, when the swinging portion is in contact with the spacer,
2. The valve plate device according to claim 1, wherein the valve plate device is connected to the swinging portion while being bent with respect to the swinging portion so as to be parallel to the opening surface of the discharge hole. To be

According to the third aspect of the present invention, the retainer has a curved surface on the discharge valve side surface, and the tangent angle at the curved surface tip portion of the retainer is the angle of inclination of the opening / closing section with respect to the swinging section. The valve plate device according to claim 2, wherein the valve plate device is set larger than the above.

[0011]

In the valve plate device of the present invention, when the discharge valve closes the discharge hole of the valve plate, the discharge valve sequentially comes into contact with the curved surface of the spacer from its fixed end, and finally the tip end portion thereof. Comes into contact with the valve plate, the impact force when the discharge valve collides with the valve plate is mitigated.

Further, in the case of the valve plate device of the present invention, since the valve plate has a simple plate shape, the sealing surface around the discharge hole can be easily smoothed without increasing the cost.
The valve closing performance can be easily improved. Thereby, the volume efficiency can be improved.

Further, in the valve plate device according to the second aspect, since the opening / closing portion of the discharge valve abuts the discharge hole of the valve plate in parallel, the valve closing performance can be further improved.

Further, in the valve plate device according to the third aspect of the present invention, the tangent angle at the tip of the curved surface of the retainer is set to be larger than the inclination angle of the opening / closing part of the discharge valve with respect to the swinging part. When opening, the opening / closing portion of the discharge valve sequentially contacts the curved surface of the retainer, so that the impact force is relieved. Thus, in the valve plate device according to the third aspect, the impact force of the discharge valve can be mitigated even on the lift side.

[0015]

1 is a sectional view of a valve plate device according to an embodiment of the present invention when the valve is closed, FIG. 2 is a sectional view of the valve plate device shown in FIG. 1 when the valve is open, and FIG. 1 is a sectional view of a discharge valve of the valve plate device shown in FIG. 1, and FIG. 4 is a sectional view of a spacer of the valve plate device shown in FIG.

1 to 4, a valve plate device 1 of this embodiment is used for a swash plate compressor (not shown), and includes a valve plate 2, a discharge valve 3 and a retainer. 4 and a spacer 5.

The valve plate 2 has a substantially disc shape and is arranged at the top of a cylinder into which a piston (not shown) is slidably inserted. The valve plate 2 is formed with a plurality of discharge holes 20 corresponding to the cylinders so as to communicate with the cylinders.

The discharge valve 3 is arranged on the valve plate 2 and opens and closes the discharge hole 20. The discharge valve 3 has a petal shape and includes a fixed portion 30, a swing portion 31, and an opening / closing portion 32. The oscillating portion 31 is connected to the fixed portion 30 so as to come into contact with and separate from the spacer 5. The opening / closing part 32 is a flat part that opens / closes the discharge hole 20, and is connected to the swinging part 31. There are a plurality of valve portions 33 configured by the swinging portion 31 and the opening / closing portion 32, and these valve portions 33 are
It extends radially from the fixed portion 30. The extending direction of the valve portion 33 corresponds to the discharge hole 20 of the valve plate 2. The oscillating portion 31 has a length L1, and the opening / closing portion 32 has a length L2, which is larger than the inner diameter D of the discharge hole 20.
That is, the opening / closing part 32 is formed to be slightly larger than the discharge hole 20. The opening / closing part 32 has an inclination angle of θ1 with respect to the swinging part 31. Due to this inclination angle θ1, when the swinging part 31 is in contact with the spacer 5, the opening / closing part 32
Are in contact with the discharge holes 20 in parallel.

The retainer 4 is provided on the discharge valve 3 and regulates the lift amount of the discharge valve 3 in the opening direction. This retainer 4
Has a fixed portion 40 and a plurality of regulating portions 41, has a shape corresponding to the discharge valve 3, and the regulating portions 41 extend radially from the fixed portion 40. The regulating portion 41 has a curved surface 41a having a radius of curvature of R2 on the side surface of the discharge valve, and the tangent angle θ2 at the tip thereof is the swinging portion of the opening / closing portion 32 of the discharge valve 3 at rest. It is set to be larger than the inclination angle θ1 with respect to 31. In addition, the fixed portion 40
Has a length of L3, and the restriction portion 41 has a length of L4.

The spacer 5 is interposed between the valve plate 2 and the discharge valve 3. The spacer 5 has a substantially disc shape, and has a flat portion 50 at the center thereof and a curved portion 51 formed on the outer periphery of the flat portion 50. The curved portion 51 has a curved surface 51 a that gradually approaches the valve plate 2 from the center side toward the outer peripheral edge. The radius of the spacer 5 is L5,
The flat portion 50 has a radius of L6, and the curved surface 51a has a radius of curvature of R3. L5 is set smaller than L1, and L6 is equal to L3.

The above-mentioned valve plate 2, spacer 5, discharge valve 3 and retainer 4 are integrally fixed by bolts 6 and nuts 7.

[0022]

The valve plate device of the present invention can alleviate the impact force of the discharge valve when the valve is closed, and can therefore reduce the vibration and noise when the valve is closed.

Further, since the valve plate device of the present invention is excellent in valve closing performance, it is also excellent in volumetric efficiency.

Further, the valve plate device of the present invention does not require the use of a large-sized press device at the time of manufacture, so that the cost can be suppressed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a valve plate device according to an embodiment of the present invention when a valve is closed.

FIG. 2 is a sectional view of the valve plate device shown in FIG. 1 when the valve is open.

3 is a cross-sectional view of a discharge valve of the valve plate device shown in FIG.

4 is a cross-sectional view of a spacer of the valve plate device shown in FIG.

FIG. 5 is a sectional view of a first example of a conventional valve plate device.

FIG. 6 is a sectional view of a second example of a conventional valve plate device.

FIG. 7 is a cross-sectional view of a third example of a conventional valve plate device.

8 is a sectional view of a discharge valve of the valve plate device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve plate device 2 Valve plate 3 Discharge valve 4 Retainer 5 Spacer 20 Discharge hole 30 Fixed part 31 Swing part 32 Opening / closing part 33 Valve part 40 Fixed part 41 Restriction part 41a Curved surface 50 Flat part 51 Curved part 51a Curved surface

Claims (3)

[Claims] 1. A valve plate having a discharge hole formed at the top of a cylinder in which a piston is reciprocally inserted, and having a discharge hole formed corresponding to the cylinder, and the discharge hole provided on the valve plate. In a valve plate device including a discharge valve that opens and closes a valve, and a retainer that is provided on the discharge valve and that regulates a lift amount in the opening direction of the discharge valve, at a tip between the valve plate and the discharge valve. A spacer having a curved surface gradually approaching the valve plate is interposed as it goes, and when the discharge valve is closed, the discharge valve sequentially contacts the curved surface from its fixed side, and finally the discharge hole. A valve plate device characterized in that the valve is closed. 2. The discharge valve includes a fixed portion, a swing portion, and an opening / closing portion, the fixed portion is fixed on the spacer, and the swing portion is continuously provided to the fixed portion, It is configured to come into contact with and separate from the spacer, and the opening / closing portion is
It is a flat portion that opens and closes the discharge hole, is formed slightly larger than the discharge hole, and when the swinging portion is in contact with the spacer, it is parallel to the opening surface of the discharge hole, 2. The valve plate device according to claim 1, wherein the valve plate device is connected to the swinging portion while being bent with respect to the swinging portion. 3. The retainer has a curved surface on the side surface of the discharge valve, and the tangent angle at the curved surface tip portion of the retainer is
The valve plate device according to claim 2, wherein the opening / closing portion is set to have a larger inclination angle with respect to the swing portion.