JPS5831001Y2 - Reciprocating compressor valve gear - Google Patents

Description

[Detailed description of the invention] This invention has a central part, a ring-shaped part, and an arm connecting the central part and the ring-shaped part, and uses the central part or the arm as a fulcrum to form a ring-shaped front and back. This invention relates to a valve device for a reciprocating compressor equipped with a ring-shaped discharge valve plate that opens and closes depending on the pressure difference acting on the valve.

This kind of conventional valve device was developed in U.S. Pat. No. 52-59910.
The outline thereof will be explained with reference to FIGS. 1 and 2.

A cylinder head 9 is fixed to the head of the cylinder 10, and a ring-shaped discharge valve plate (hereinafter referred to as a valve plate) 1 is attached to the cylinder head 9 via bolts 7, a valve receiver 8, and a nut 14. .

During operation of the compressor, the valve plate 1 deforms upward due to the pressure difference between the cylinder 10 and the discharge chamber 11, and opens and closes at its outer periphery.

Next, this valve plate 1 consists of a central part 6, a ring-shaped part 2, and an arm part 3 that connects the central part 6 and the ring-shaped part 2,
The central portion 6 and the arm portions 3 each have a circular arc-shaped hole in plan view, and the central portion 6 is provided with a hole through which a bolt 7 is passed.

When the valve plate 1 operates normally, the stress is highest at the arm base 4, which is the fixed end of normal deformation, and this type of valve is also designed based on stress calculations at the arm base 4. .

That is, the dimensions of the ring-shaped portion 2 of the valve plate are larger than the width that can cover the required discharge port area, so that a spring constant that regulates the discharge pressure can be obtained, and the stress acting on the arm base 4 can be reduced. The width and thickness are set to be permissible, and both the arm base portion 4 and the arcuate portion 5 are formed to have the same width and thickness.

However, for example, during unloading operation, cylinder 1
Under specific operating conditions where the pressures between 0 and the discharge chamber 11 are almost balanced, the pressure that would push the entire valve plate 1 up to the valve receiver 8 is not applied, and the restriction is minimal and the opening/closing displacement during normal operation is at its maximum. A local deformation occurs in which only the central portion 5 of the arc-shaped portion is pushed up.

This local deformation generates stress that exceeds an allowable value in the central portion 5 of the arcuate portion, and in some cases, this portion may break.

The purpose of this invention is to reduce the stress acting on the central portion of the arcuate portion of the discharge valve plate, thereby preventing the valve plate from breaking.

To achieve the above object, the technical means of the present invention is to gradually increase the ring-shaped portion of the discharge valve plate from the base of the arm toward the center of the arc-shaped portion.

In this way, since the plate in the area where local deformation occurs is formed wide, the stress acting on the rotation part can be reduced by approximately 1 to 1 in inverse proportion to the plate, reducing the stress to below the allowable value. can do.

Hereinafter, one embodiment of this invention will be explained with reference to FIG.

The valve plate 1 has a central part 6 and a ring-shaped part 1, as in the conventional one.
2. It consists of an arm part 3 that connects a central part 6 and a ring-shaped part 12, and is formed so that the outer diameter C connecting the maximum opening/closing displacement part 13 is longer than the outer diameter a perpendicular thereto. .

The outer peripheral shape of the valve plate 1 may be a shape in which circular arcs are connected by tangents, or may be in an arbitrary curved shape such as an ellipse.

Since the inner diameter Φb of the ring-shaped part has the same radius, the width of the ring-shaped part gradually increases from the part past the radius of the base of the arm part 3 toward the center part 13 of the arc-shaped part, which is the maximum displacement part during normal operation. It is widely formed.

As mentioned above, since the central part of the arcuate part, which tends to cause local deformation, is formed wide, the stress acting on this part decreases in approximately inverse proportion to the thickness of the plate, and should be kept below the allowable value. This prevents the valve plate in the same area from breaking.

This technical problem can be solved by forming only the central part of the circular arc part to be wide, but the above shape has the disadvantage that stress is concentrated at the corner part where the width widens. , since the width of the ring-shaped part increases gradually from the base of the arm toward the center of the arc-shaped part, and there is no corner part,
This has the excellent effect of preventing stress concentration.

[Brief explanation of drawings]

Figure 1 is a cross-sectional elevational view showing a valve device of a reciprocating compressor equipped with a conventional ring-shaped discharge valve plate, Figure 2 is a plan view showing a conventional ring-shaped discharge valve plate, and Figure 3 is this invention. It is a top view which shows the ring-shaped discharge valve plate by. 1...Ring-shaped valve plate, 3...Arm part, 6
...Central part, 7...Bolt, 8...
...Valve receiver, 9...Cylinder head, 12.
...Ring-shaped part, 13...Central part of circular arc-shaped part, a...Outer diameter perpendicular to outer diameter C, C...
...Outer diameter connecting the center of the arc-shaped part.

Claims (1)

[Scope of utility model registration request] A ring that has a central part, a ring-shaped part, and an arm that connects the central part and the ring-shaped part, and that opens and closes using the pressure difference that acts on the front and back of the ring-shaped part, using the central housing or the arm as a fulcrum. A valve device for a reciprocating compressor equipped with a shaped discharge valve plate, characterized in that the ring-shaped part of the ring-shaped discharge valve plate gradually increases in number from the base of the arm toward the center of the arc-shaped part. A valve device for a reciprocating compressor.