JP2000087858A - Discharge valve device for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress dispersion of performance of a discharge valve device and its noises by arranging a damper spring and a stopper on the discharge valve, forming a projection on the stopper projected in the opposite direction to an abutting surface of the damper spring, and pressing the projection by the use of a certain portion of the cylinder head. SOLUTION: A discharge port 4 of a valve plate 2 is opened to a bottom surface 6 in a recession 5, while a concentric groove 7 is formed on its periphery. A support part 9 integrated with a discharge valve 8 is arranged in a support part housing part 11 formed in the recession 5 of the valve plate 2. A damper spring 12 having a pair of valve pressing pieces 13 is arranged on the discharge valve 8, pieces being bent in the direction for press-fitting the support part of the discharge valve 8. A stopper 18 is arranged on the damper spring 12, stopper having elastic supporting pieces 18 at its both ends, and a center portion bent in a projected form. A projection 20 on an upper surface of the stopper 19 is brought into contact with an abutting portion 23 in a projection chamber 22 of a cylinder head 21.

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 used in a refrigeration compressor for home use or business use, and more particularly to a discharge valve device most suitable for a compressor having less variation in efficiency and noise. is there.

[0002]

2. Description of the Related Art Conventionally, many proposals have been made for such a discharge valve device, and after completion of a compression / exhaust stroke, a high-pressure gas that has not been exhausted re-expands into a discharge port space of a valve plate during a suction stroke. In some cases, the amount of inhaled gas may decrease. In order to alleviate this problem, there is known a type in which a concave portion is provided in a valve plate and a discharge valve is disposed inside the concave portion.

[0003] Such prior art is disclosed in US Patent No. 4,528.
06 and JP-B-3-53477.

That is, in the former, a discharge valve is provided in a concave portion of a valve plate, a guide for supporting the discharge valve in a fixed position,
A damping plate, a stopper, and a pressing spring are sequentially laminated.

In the latter prior example, the stopper is also elastically supported by a separate spring. Still another prior example is U.S. Pat. No. 5,209,260. What is disclosed herein is that the end of the stopper is bent and the bent portion is pressed by a cylinder head to fix the stopper.

[0006]

However, in the first prior art and the second prior art, since a spring member is used as a member for supporting and fixing the stopper, there is a problem that the manufacturing cost is increased. On the other hand, in the third prior example, the substantial size of the stopper, which limits the movement of the discharge valve when ascending, may change due to the manufacturing dimensional accuracy of the stopper. Input and noise may vary.

On the other hand, the damping plate elastically contacts the discharge valve in all of the first to third prior art examples of the support structure of the discharge valve. However, the opening / closing operation of the discharge valve may be changed due to the variation in the shape accuracy.

[0008]

According to the present invention, there is provided a valve plate having a suction hole and a discharge hole, the discharge hole being formed in a concave portion, a support portion disposed in the concave portion and having a support portion at one end and another end. A discharge valve having a valve portion, a damper spring disposed on the discharge valve, and a stopper disposed on the damper spring, the stopper protruding from a side opposite to a contact surface of the damper spring. The protruding portion is formed, and the protruding portion is pressed by a part of the cylinder head.

The present invention also provides a valve plate having a suction hole and a discharge hole, wherein the discharge hole is formed in a recess.
A discharge valve having a support portion at one end, a valve portion at the other end, a damper spring disposed on the discharge valve, and a stopper disposed on the damper spring; The damper spring includes a pair of valve pressing pieces that bend the support portion of the discharge valve in the pressing direction and a pair of stable pieces that are bent in the abutting direction on the bottom surface of the concave portion. The tip forms a round portion that does not prevent the opening of the valve.

[0010]

With such a configuration, the stopper is in direct contact with the cylinder head. Specifically, the regulation dimension at which the discharge valve contacts the stopper via the damper spring, that is, the dimension between the mounting portion of the stopper and the upper portion of the valve portion of the discharge valve is independent of the dimension between the upper surface of the projection and the mounting portion of the stopper. With the dimensions set, the stopper is fixed by assembling the cylinder head.

[0011] Further, the valve pressing piece of the damper spring allows the discharge valve to open along the radius portion without applying unnecessary pressing force when the discharge valve is opened.
Further, the damper spring is supported by the stabilizer so as to maintain a proper clearance above the discharge valve.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS.

1 is a discharge valve device for a compressor, and 2 is a valve plate having a suction hole 3 and a discharge hole 4. The discharge hole 4 is opened in the bottom surface 6 in the concave portion 5, and 7 is a concentric concave groove formed on the peripheral edge thereof. Reference numeral 8 denotes a discharge valve having a support portion 9 at one end and a valve portion 10 at the other end, and the support portion 9 is disposed in a support portion storage portion 11 formed in the concave portion 5. A damper spring 12 has a discharge valve 8 at one end.
A pair of valve holding pieces 1 with the supporting portions 9 bent in the pressure contact direction
3 and a pair of stabilizers 14 bent in the contact direction on the bottom surface 6 of the recess 5. This stabilizing piece 14 is arranged in a storage part 15 provided in a part of the concave part 5. 16
Is a round portion formed at the lower corner of the valve pressing piece 13.

A stopper 17 has a fork-like elastic support piece 18 for temporary holding at both ends, and a stopper portion 19 bent at a central portion in a convex shape by a predetermined size allowing deformation of the damper spring 12. Is formed. Further, a protruding portion 20 protruding toward the anti-damper spring side is integrally formed, and comes into contact with the contact portion 23 in the protruding chamber 22 of the cylinder head 21. The elastic supporting piece 18 is elastically supported by the mounting step 24 of the recess 5. At this time, the dimension A (FIG. 2) between the lower surface of the elastic support piece 18 and the stopper 19 is
Processing can be performed regardless of the thickness variation of the stopper 17,
Furthermore, the dimension B between the lower surface of the elastic support piece 18 and the upper surface of the protrusion 20
(FIG. 2) can also be processed without being concerned with the thickness variation.

Reference numeral 25 denotes a suction chamber in the cylinder head 21;
26 is a gasket. With such a configuration, the discharge valve 8
Is assembled, the support portion 9 of the discharge valve 8 is pressed by one end of the valve pressing piece 13 of the damper spring 12, and is supported with a clearance between the radius portion 16 and the bottom surface 6 of the concave portion 5. Also, the damper spring 12 itself is a stable piece 1
4 keeps it parallel to the discharge valve 8 (FIG. 2). Further, the stopper 17 is provided so that the protrusion 20 is
The stopper 19 is slightly pressed down by being attached, and is securely supported by the valve plate 2.

Next, the operating state of the discharge valve 8 will be described. When the internal pressure of the cylinder slightly rises above the internal pressure of the discharge chamber 22, the discharge valve 8 starts to open, and then the valve portion 10 comes into contact with the damper spring 12, and Spring 12
Is bent upward to continue the opening and closing operation. At this time,
The support portion 9 of the discharge valve 8 moves along the round portion 16 of the valve pressing piece, and does not apply unnecessary urging force to the support portion 9. Further, at the time of startup transition operation such as liquid compression, the damper spring 12 abuts against the stopper portion 19 and the discharge valve 8
The operation of is regulated.

[0017]

According to the present invention, the stopper can be used to process a portion requiring a predetermined dimensional control without considering the thickness variation of the material, so that the variation width can be reduced and the cost can be reduced. In addition, a compressor with small variations in performance and noise can be obtained.

Further, the support portion of the discharge valve can smoothly open and close by a round portion provided on the damper spring, and the stability of the input portion can be reduced by the stabilizing piece without changing the clearance with the discharge valve. It has high practical effects, such as obtaining a compact compressor.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a discharge valve device for a compressor showing one embodiment of the present invention.

FIG. 2 is a sectional view of a main part in an assembled state showing an embodiment of the present invention;

FIG. 3 is a plan view of the damper spring.

[Explanation of symbols]

 2 Valve plate 3 Suction hole 4 Discharge hole 5 Depressed portion 8 Discharge valve 9 Support portion 10 Valve portion 12 Damper spring 13 Valve holding piece 14 Stabilizing piece 16 R 17 Stopper 20 Projection 21 Cylinder head

Claims (2)

[Claims] 1. A discharge valve having a suction hole and a discharge hole, wherein the discharge hole is formed in a concave portion, and a discharge valve disposed in the concave portion and having a support portion at one end and a valve portion at the other end. A damper spring disposed on the discharge valve, and a stopper disposed on the damper spring, wherein the stopper forms a protruding portion protruding on a side opposite to a contact surface of the damper spring. A discharge valve device for a compressor, wherein the protrusion is pressed by a part of a cylinder head. 2. A discharge valve having a suction hole and a discharge hole, wherein the discharge hole is formed in a concave portion, and a discharge valve disposed in the concave portion and having a support portion at one end and a valve portion at the other end. And a damper spring disposed on the discharge valve, and a stopper disposed on the damper spring, wherein the damper spring has a pair of valve presses formed by bending the support portion of the discharge valve in a pressing direction. A discharge valve for a compressor, comprising a pair of pieces and a pair of stabilizer pieces bent in a contacting direction on the bottom surface of the concave portion, and the tip of the valve pressing piece forms a rounded portion that does not prevent opening of the valve. apparatus.