JPS58211076A - Reed valve apparatus of compressor - Google Patents

Abstract

PURPOSE:To damp and suppress the high-order vibration mode by means of an elastic plate by installing one edge part of the elastic plate between a valve fixing surface and a reed valve and extending the free edge part of the elastic plate so as to be opposed to the concaved part between the valve fixing surface and a valve seat surface. CONSTITUTION:The secondary vibration is generated in a reed valve 8, in addition to the primary vibration by repeating, in a number of times per unit time, the ON/OFF operation of the reed valve 8. However, an elastic plate 7 damps the secondary vibration of the reed valve 8 and suppressed generation of vibration. Particularly, if the effective length of the elastic plate 7 is set more than the half of the effective length of the reed valve 8, the elastic plate 7 suppresses the peak part of the secondary vibration mode, and the effective damping can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a reed valve device, which is a discharge valve of a rotary compressor, for example, and particularly relates to an improvement in a structure for preventing vibration and damage of a reed valve.

[Technical background of the invention and its problems]

FIG. 1 shows a conventionally used rotary compressor. This consists of an electric motor section and a compressor section C housed in a closed container a. The electric motor section consists of a rotor el fitted onto a rotating shaft d and a stator e2 provided around the outer periphery of the rotor el.

The compressor section C includes a cylinder h provided between a bearing f that pivots the rotation shaft d and a sub-bearing g, a rotor l that rotates eccentrically within the cylinder a, and the like. A reed valve device R is provided on the upper end surface of the shaft xf to discharge and guide the compressed gas compressed by the eccentric rotation of the rotor 1 into the closed container a.

This reed valve device R is shown in FIG.

That is, the upper end surface of the bearing f is recessed with a valve portion.
A valve seat k is protruded from a part of the valve. Port t on valve seat
Needless to say, is in communication with the inside of the cylinder h. In addition, a valve fixing part m is provided at a position apart from the valve seat, and a reed valve n and a valve part 0 are overlapped with each other to secure the fixed part p.
It is fixed in place. The free end of the reed valve n abuts the valve seat surface, which is the upper surface of the valve seat. Benbe above.

The IJ-shaped valve n is curved so as to be located above the free end of the valve n, and the IJ-shaped valve n is curved and deformed between the valve seat surface 1 and the valve part 0.1. l? -) T is designed to open and close.

A recess q is provided between the valve seat and the valve fixing part m, which prevents cavitation that occurs when lubricating oil mixes with the compressed gas in a mist form to have an adverse effect on the reed valve n. This is something that is not meant to prevent the occurrence of.

However, in this type of reed valve device R, high-order vibrations are likely to occur in the reed valve n itself. Normally, the reed valve n is shown in Figure 3 (
As shown in 4), it vibrates in the primary vibration mode y1, but due to the provision of the recess q (ω) in the same figure.
As shown in the figure, a vibration mode y2 that is a combination of primary and secondary vibrations is generated. Therefore, the speed of the free end of the reed valve n is doubled υ, and the impact force when it collides with the valve seat surface increases four times. Therefore, the noise becomes louder, the valve seat surface kl is significantly worn, and the metal fatigue of the reed valve n becomes rapid, leading to a risk of breakage.

Conventionally, for example, in Japanese Utility Model Application Publication No. 48-26519, a washer made of a relatively soft material was provided between a valve plate and the head of a bolt or rivet for fixing the valve plate, and between the valve plate and a partition wall. The model shown is one in which a noise reduction device is installed.

However, the valve plate of this invention is a ring valve, and the second valve plate is a ring valve.
Not only is the timing different from the conventional structure of the gated valve shown in the figure, but this design also aims to reduce stress by reducing the valve lift in one direction, which is said to prevent secondary vibration of the valve. There is no technical idea at all.

Furthermore, Japanese Utility Model Application Publication No. 52-23706 discloses a system in which at least one surface of the suction valve and the discharge valve or the seat surface is coated with a sound-absorbing buffer film to reduce noise. Ru.

However, simply coating the valve surface or seat surface with a film does not prevent secondary vibration of the valve, and there remains a risk of breakage.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its purpose is to control the high-order vibrations generated in the reed valve, reduce noise and wear of the valve seat surface, and to reduce the noise and wear of the valve seat surface. The present invention aims to provide a reed valve device for a compressor that can reliably prevent breakage accidents.

[Summary of the invention]

In the present invention, one end of an elastic plate is interposed between the valve fixing surface and the reed valve, and the free end of the elastic plate is opposed to the recess between the valve fixing surface and the valve seat surface. The high-order vibration mode of the reed valve is buffered by the elastic plate.

[Embodiments of the invention]

An embodiment of the present invention will be described below based on the drawings. The structure of the compressor itself is the same as that shown in FIG. 1, so a description thereof will be omitted. The reed valve device is shown in FIG. Reference numeral 1 denotes a bearing that constitutes a part of a compressor section (not shown). A valve portion 2 is recessed in the upper end surface of the bearing 1. A valve seat 3 is provided protruding from the bottom surface of the valve portion 2, and a port 4 that communicates with a cylinder chamber (not shown) is provided protrudingly. Further, a valve fixing portion 5 is protruded from the bottom surface of the valve portion 2 separated from the valve seat 3 by a predetermined distance. A recess 6 is provided between the valve seat 3 and the valve fixing part 5.

On the valve fixing surface 5a, which is the upper end surface of the valve fixing part 6,
An elastic plate 7, a reed valve 8, and a valve part 9, which will be described later, are stacked in this order, and one end of each is attached to a fixing device 1 such as a rivet.
Fixed through 0.

The elastic plate 7 is, for example, a plate spring material, has a relatively thin plate thickness, and has a free end extending so as to face the recess 6 . The reed valve 8 is also made of a leaf spring material, for example, and its free end extends so as to come into contact with the valve seat surface 3a, which is the upper end surface of the valve seat 3. - The valve holder 9 is made of a steel plate, for example, and has a relatively large thickness, and its free end is curved so as to face the upper part of the reed valve 8. The height dimension H of the valve seat surface 3a is the height dimension H of the valve fixing surface 5a.
, and the thickness S of the elastic plate 7 are glassed. Further, the effective length t1, which is the length from the valve fixing surface 5a of the elastic plate 7 to the free end of the valve wrist, must be greater than or equal to the effective length t2 of the reed valve 8, A.

As the rotor eccentrically rotates, the gas to be compressed is sucked into the cylinder chamber and compressed.

When compressed to a predetermined pressure, the reed valve 8 separates from the valve seat surface 3a and comes into contact with the valve part 9, opening the port 4. Therefore, the compressed gas is released from the cylinder chamber, and when the pressure in the cylinder chamber decreases, the reed valve 8 separates from the valve part 9 and comes into contact with the valve seat surface 5IL, thereby closing the port 4. Further, new compressed gas is sucked into the cylinder chamber, and the above-mentioned operation is repeated.

In this way, by repeating the opening and closing operations of the reed valve 8 many times per unit time, the reed valve 8 generates not only primary vibration but also secondary vibration.

However, the elastic plate buffers the secondary vibration of the reed valve 80,
Suppresses vibration generation. In particular, since the effective length of the elastic plate 7 is set to be equal to or larger than the effective length of the reed valve 8, the elastic plate 7 can suppress the peak (antinoendum) portion of the secondary vibration mode and provide effective buffering.

In addition, since the height H of the valve seat surface 3a is the same as the sum of the height H1 of the valve fixing surface 5a and the thickness S of the elastic plate 7, the reed valve 8 is placed uniformly on the valve seat surface 3a. Can be touched.

For this reason, the sealing performance of the reed valve 8 is good, and local stress concentration does not occur.

〔Effect of the invention〕

In the present invention, one end of an elastic plate is interposed between the valve fixing surface and the reed valve, and the free end of the elastic plate is arranged so as to face the recess between the valve fixing surface and the valve seat surface. Since it is extended, the elastic plate buffers and suppresses the high-order vibration mode P that accompanies the opening/closing operation of the reed valve. Therefore, it is possible to reduce noise generation, reduce wear on the valve seat surface, prevent breakage of the reed valve, and improve reliability.

The height dimension of the valve seat surface is still the same as the height dimension of the valve fixing surface.
Since the dimension is approximately equal to the combined thickness of the Grade II plate, the reed valve uniformly contacts the valve seat surface, improving sealing performance and preventing local stress concentration from occurring.

Since the effective length of the elastic plate is set to be equal to or longer than the effective length of the reed valve, the elastic plate suppresses the peak portion of the higher-order vibration mode of the reed valve, and vibration generation can be reliably suppressed.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a rotary compressor, Fig. 2 is a longitudinal sectional view of a reed valve device showing a conventional example of the present invention, Figs. 3 and CB) are vibration mode sections of the reed valve, and Fig. 4 1 is a longitudinal cross-sectional view of a reed valve device showing one embodiment of the present invention. 5a... Valve fixing surface, 3 &... Valve seat surface, 3... Valve seat, 6... Recess, 7... Elastic plate, 8... Lead surface. Figure 1 Figure 2

Claims (3)

[Claims] (1) Equipped with a reed valve whose one end is fixed to the valve fixing surface and whose other free end approaches and separates from the valve seat surface to open and close the valve seat, and a recess is provided between the valve fixing surface and the valve seat surface. In the things that
A compressor characterized in that one end of an elastic plate is interposed between the valve fixing surface and the reed valve, and the other free end of the elastic plate extends to a position facing the recess. Reed valve device 0 (2) The height of the valve seat surface is approximately equal to the sum of the height of the valve fixing surface and the thickness of the elastic plate. A reed valve device for a compressor according to item 1. (3) The compressor reed valve device according to claim 1, wherein the effective length of the elastic plate is greater than or equal to the effective length A of the reed valve.