JPH03255280A - Reed valve of compressor - Google Patents

Abstract

PURPOSE:To shorten the whole length of a valve in addition to satisfying requirement for the length of the flat section of a valve guard by shortening the length of a bearing generation section by making the external diameter of the contacting section of a clamping means to a valve guard smaller than the external diameter of the head section. CONSTITUTION:A portion 5b, the diameter of head section of which is smaller than that of the head section 5a of a bolt 5 for clamping and fixing a plate 4 whose port 3 is opened, reed valve plate 1, and valve guard 2, is formed under the head section 5a. The portion 5b is brought into contact with the valve guard 2 and clamped. Therefore, although the range of bearing caused by clamping extends to the range of from the external periphery of the portion 5b whose diameter is smaller than that of the head section 5a to an angle of 45 deg., a bearing generation range becomes a range l'2 of a diameter smaller than that of a large external diameter head portion 5a. Therefore, the required length l'1 of the flat section of the valve guard 2 can be shortened in addition to satisfying requirement, and the whole length of a valve can be shortened.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to downsizing of a compressor that compresses fluid.

[Conventional technology]

For compressors, the advantage of having a small number of parts and simplifying the structure is that
Reed-shaped valve devices, such as the one shown in the figure, are widely used.

As shown in FIG. 4, the reed-shaped valve device has a reed valve plate 1.
．． Hold the valve 2. It is composed of a plate 4 having a hole for the port 3, and a tightening means 5 such as a bolt for integrally tightening and fixing the reed valve plate 1 and the valve retainer 2 to the plate 4.

The valve holding plate consists of a flat part (Ωi in the diagram) that holds the reed valve plate against the plate, and an R part that restrains the lift of the reed valve plate when the valve is opened.The lift h does not reduce the performance of the compressor. The amount of The amount of R for holding down the valve is determined by the lift h and the valve span L1, but the amount of R and the valve opening stress of the closed valve plate are inversely proportional to each other, and the larger R is, the lower the stress is.

Therefore, when designing the valve, it is necessary to ensure R, and therefore Ll, such that the stress does not exceed the fatigue limit.

On the other hand, there is another condition when designing a valve.

In other words, in order to prevent fretting caused by surface pressure caused by tightening at the valve opening part, the length Ql of the flat part is equal to the length Qz of the part generating surface pressure (generally 45 mm from the outer circumference of the head of a bolt, etc. It needs to be larger than ).

[Problem to be solved by the invention]

In the above-mentioned conventional technology, when designing the reed valve device, if one dimension related to the valve opening stress and the Q1 dimension related to the range of surface pressure applied by tightening bolts, etc. are attempted to be secured, the total length L2 of the valve device becomes large. There was a problem in that it became an obstacle when downsizing the compressor.

The purpose of the present invention is to shorten the overall length of the valve device and downsize the compressor while satisfying the Q1 dimension regarding valve opening stress, which is a prerequisite when designing a reed valve, and the Q1 dimension regarding surface pressure. It's about achieving.

[Means to solve the problem]

The above purpose is to
This is achieved by reducing the diameter of the part that directly contacts the valve holder.

[Effect]

The surface pressure due to tightening spreads over a range of about 45° from the outer periphery of the contact portion of the tightening means with the valve retainer. here.

Since the outer diameter of the contact portion is smaller than the outer diameter of the head of the tightening means, the range of action of surface pressure is narrower than when tightening directly with the head.

As a result, the length of the flat portion of the valve retainer, which must be longer than the surface pressure acting range, can be shortened, and the overall length of the valve device can be shortened.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

Valve device beam, valve plate 1 and valve retainer 2. Boat 3 perforated plate 4. It is composed of bolts 5 that integrally tighten and fix the reed valve plate 1 and the valve retainer 2 to the plate 4. The bolt has a portion 5b smaller in outer diameter than the head formed below the head 5a, and this portion 5b is in contact with the valve retainer 2. Therefore, the surface pressure due to bolt tightening spreads over a range of 45 degrees from the outer circumference of the bolt 5b, which has a smaller outer diameter than the bolt head 5a, so the length of surface pressure generation at the reed valve plate is Qz, and the conventional example ( It is shorter than Qz in Fig. 4). Accordingly, the required length Ql of the flat part of the valve press is also 01 of the conventional example.
becomes shorter.

As a result, Qx is shortened to Ql without changing the valve span L1, which affects the magnitude of the valve opening stress, and the overall length of the valve device is also reduced to L.
This can be shortened from 1 to L2/, making it possible to downsize the compressor.

In Fig. 2, a spacer 6 with an outer diameter smaller than the bolt head is inserted between the bolt 5 and the valve retainer 2 instead of providing the bolt with a small diameter portion 5b, but this embodiment also The same effect as the embodiment shown in FIG. 1 can be obtained.

In FIG. 3, a rivet 5' is used as the tightening means for the reed valve plate and the valve retainer 2, but in this embodiment as well, there is a space between the rivet head and the valve retainer 2 that is outside the rivet head. By inserting a spacer 6 with a small diameter, the same effects as in the embodiments shown in FIGS. 1 and 2 can be obtained.

〔Effect of the invention〕

According to the present invention, by making the outer diameter of the contact portion of the tightening means with the valve retainer smaller than the outer diameter of the head of the tightening means, the range of action of the surface pressure due to tightening can be narrowed, so that the valve can be opened. The overall length of the valve device can be shortened while satisfying the valve span regarding stress and the flat section length regarding surface pressure, making it possible to shorten the overall length of the valve device.
It has the effect of giving shape.

[Brief explanation of drawings]

1 to 3 are cross-sectional views of a reed valve device showing an embodiment of the present invention, and FIG. 4 is a cross-sectional view of a conventional reed valve device. 1...Reed valve plate, 2...Valve holder, 3...Boat, 4...Plate, 5゜5'...Tightening means, 6...Spacer.

Claims (1)

[Scope of Claims] 1. Consisting of a plate with a hole in the port, a reed valve plate, a valve holder for regulating the softness of the reed valve plate, and a tightening means such as a bolt or a rivet, and the tightening means A compression device in which a reed valve plate and a valve retainer are integrally tightened and fixed to the plate, wherein the outer diameter of the contact portion of the tightening means with the valve retainer is smaller than the outer diameter of the head. Machine reed valve device. 2. It is composed of a plate with a port drilled therein, a reed valve plate, a valve holder for regulating the softness of the reed valve plate, and a tightening means such as a bolt or a rivet, and the tightening means tightens the reed valve plate and the valve holder. In the valve device which is integrally tightened and fixed to the plate, a spacer having an outer diameter smaller than the head of the tightening means is inserted between the head of the tightening means and the valve holder. Features a compressor reed valve device.