JPH0281973A - Compressor discharge valve device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a discharge valve device for an a-tary compressor, etc., and particularly relates to a structural improvement of a valve λ' surface suitable for improving the reliability and efficiency of a discharge valve. It is related to.

[LΣ rice technology]

A conventional discharge valve device for a rotary compressor has a reed valve type discharge valve disposed on a bearing end plate surface that closes both open ends of a cylinder constituting a compression mechanism, and a discharge hole opened to a pressure Ia chamber. Generally, a valve seat surface is formed on the outer periphery, and this valve seat surface is opened and closed by a discharge valve.

In this type of discharge valve device, the volume of the discharge hole portion is an invalid volume (clearance volume), which causes loss in the compressor, but if the discharge hole is made smaller to reduce this clearance volume loss, the discharge valve will work harder. (As the area of action of the gas pressure becomes smaller, the inside of the cylinder is excessively compressed to obtain the necessary valve lifting force, which increases overcompression loss and increases the impact force when the discharge valve hits the valve seat, resulting in impact fatigue. There was a rare risk of damage to the discharge valve.In addition, if the discharge hole was made larger to reduce this overcompression loss and reduce the impact force, the clearance polyem loss would increase and the discharge valve would be damaged when the discharge valve was blocked. The resulting bending stress increases, and there is a risk that the discharge valve will be damaged due to bending fatigue and that the life of the discharge valve will be shortened.

Examples of this type of discharge valve device that increases the strength of the discharge valve to prevent damage include those disclosed in Japanese Patent Application Laid-open No. 58-126495 and Japanese Utility Model Application No. 60-3570.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, although the rigidity of the discharge valve is enhanced and the reliability is improved, it cannot be said that the structure of the discharge valve or the performance improvement thereof is necessarily fully satisfied.

An object of the present invention is to provide a discharge valve system [f' for a compressor that improves performance by reducing both clearance polymer loss and overcompression loss, and improves the reliability of the discharge valve. .

[Means to solve the problem]

In order to achieve the above object, the configuration of the discharge valve device for a compressor according to the present invention is such that the valve seat surface on which the discharge valve comes into contact has a substantially concentric double structure, and the first valve seat surface located on the outside has a substantially concentric double structure. An annular groove is provided between the valve seat and the second valve seat surface located on the inner side, and a flow path is provided that communicates the annular groove with the discharge hole or the pressure M chamber.

[Effect]

The valve seat surface T211 structure that the discharge valve contacts increases the contact area and weakens the impact blade when the discharge valve hits the valve seat, and also reduces the bending force (valve deflection) when the discharge valve is closed.
By reducing this, it is possible to completely prevent the crest of the discharge valve due to impact fatigue and bending fatigue, thereby improving reliability.

Further, an annular groove is provided between the first valve seat surface located on the outside and a second valve seat surface that surrounds the discharge hole on the inside, and the annular groove is connected to the discharge hole or the compression chamber. By providing the passage, the area of action of the gas pressure acting on the discharge valve is expanded to the first valve seat surface located on the outside by the communication passage, while the clearance polyneme is kept small. is not overly compressed. Therefore, both the clearance polymer loss and the overcompression loss can be reduced, and the performance of the compressor can be improved.

〔Example〕

Hereinafter, the present invention will be explained by examples. FIG. 1 is a longitudinal cross-sectional view of a discharge valve device according to an embodiment of the present invention, FIG. 2 is a front view of the valve seat surface of FIG. 1, FIG. 6 is a longitudinal cross-sectional view of a rotary pressurizer, and FIG. is a vertical sectional view of a conventional discharge valve device, FIGS. 5 and 6 are vertical sectional views of a discharge valve device according to another embodiment of the present invention, and FIG. 7 is an exploded view of the valve seat surface of FIG. 6. The visual diagram is Ruru. In each figure, nine identical parts are designated by the same number.

I2f: Configuration of the ejection device of the rotary compressor according to this embodiment will be explained using FIGS. 1 to 5. 1 is a closed container, 2 is an electric wall part, and 3 is a compression mechanism part.

The electric motor section 2 is connected to the rotating shaft 4 of the compression mechanism section 3.

The compression mechanism section 3 includes a cylinder 5.7, a roller 6 that rotates eccentrically within the ring 5, and a main bearing 7 that pivotally supports a rotating shaft. It consists of a sub-bearing 8, etc. 9 is a discharge cover surrounding the sub-bearing 8, and 10 is a discharge chamber. 11 is a discharge hole 12 that communicates the discharge chamber 10 and the pressure m chamber 54 in the cylinder 5 is a discharge valve; 15 is a discharge valve 12
The lift (displacement) 't- is the valve body that defines the lift (displacement) 't-. 14
is the valve seat surface that the discharge valve 12 comes into contact with, which is formed approximately concentrically around the discharge hole 11, and is the valve seat surface 14cL of the outer gt.
and from the inner @2 valve seat surface 146. 15 is an annular groove formed in the threshold of the first valve seat surface 144 and the second valve seat surface 144, and 16 is an annular groove formed in a portion of the second valve seat surface 146 (both are formed by drilling at one or more places). There is a communication 4 connecting the annular groove 15 and the discharge hole 11.The discharge valve 12 and the valve body 16 are fixed to the sub-bearing 8 by a fixing bolt 17.18 is a suction pipe into which suction gas flows; There is a discharge vibrator from which the pressure nfC gas flows out.

Next, the operation of a discharge valve device according to a fourth example VC of the present invention will be described. The gas flowing into the cylinder 5 through the suction pipe 1a has a pressure of -N with no eccentric rotation of 176V.
5 The volume of a is reduced and the gas is compressed. After being compressed to a predetermined pressure, the discharge valve 12 is opened from the valve seat surface 14 to 4.
After a while, the valve body 15 is brought into contact with the discharge hole 11 and the discharge hole 11 is opened.

Therefore, the gas is discharged into the discharge chamber 10 through the discharge hole 11ft of the compression chamber 5a.

When the discharge of pressure gas is completed and the pressure in the compression chamber 54 has decreased, the discharge valve 12 is separated from the valve body 13 and comes into contact with the valve seat surface 14 to close the discharge port. Then, at 76, gas is sucked into the cylinder 5 again and the above operation is repeated.

In this way, the opening of the discharge valve 12 is expressed by the following equation, assuming that the pressure difference ΔP between the pressure M chamber 54 outside fPh and the discharge chamber 1o is ΔP, and the upward force Fv of the discharge valve 12 is the diameter t-D of the valve seat surface. (1) % formula % However, C: Push-up coefficient Therefore, the larger the diameter of the valve seat surface is, the necessary push-up force can be obtained with a smaller differential pressure, and the overpressure loss can be reduced by 7. In the discharge valve device of the present invention, since the annular groove 15 and the discharge hole 11'i communicate through the communication groove 16, the diameter of the valve seat surface on which the differential pressure acts is the brown 1 valve seat surface 14c located on the outside.
It becomes Lζ. On the other hand, the clearance polyne VCL remaining in the discharge n is expressed by the following equation (2), and the work of compressing the gas of VCL becomes a loss.

V c kq-D p" *H-song・-・----
-(2) However, Dp = Discharge hole diameter H: Plate thickness of the discharge hole section [According to the structure of the present invention, f) p (D), clearance volume loss can be reduced, and overcompression loss can also be reduced. .

In addition, the impact force when the discharge valve 12 hits the valve seat surface 14 is also
The impact stress on the discharge valve 12 can be completely relaxed because it is received by two valve seats, the first valve seat surface 14a and the second valve seat surface 144, which are configured in a substantially concentric circle. Furthermore, when the discharge valve 12 is in the state where the discharge hole 11t is closed,
At maximum, the differential pressure between the discharge pressure and the suction pressure moves to the discharge valve 12, so that in the conventional discharge valve device shown in FIG. 4, the discharge valve 12 bends as shown by the broken line.

In contrast, in the present invention, the second valve seat surface 1 located on the inner surface
Since the discharge valve 12 is supported by the 4 good methods, the amount of deflection is small.
Bending stress can be reduced. As described above, according to the present invention, damage to the discharge valve due to impact fatigue and bending fatigue can be prevented, and reliability can be completely improved.

In the embodiment shown in FIG. 5, the annular groove 15 and the compression chamber 5a are communicated with each other through a communication hole 16a, so that the same effect can be achieved.

In the embodiment shown in FIG. 6.7, the second valve seat surface 144 is separated by a bush 20, and this bush 20 is press-fitted and fixed to form a concentric valve seat. Makoko Bush 20VC
A communication hole 164 is formed to communicate the annular #15 and the discharge hole 11. In this embodiment, the valve seat processing is simplified and the first
The same effect as the embodiment shown in the figure can be achieved.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the structure of the valve seat surface of the discharge valve is improved, and the impact stress 1 bending stress 'jk generated in the discharge valve can be reduced, so that the same reliability can be achieved and the clearance can be reduced. Even if the polyneem is small, the lifting force can be increased, so there is less loss (high performance compression).
A discharge valve device for the machine can be provided.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a discharge valve device according to an embodiment of the present invention, FIG. 2 is a front view of the valve seat surface of FIG. 1, and FIG.
4 is a longitudinal sectional view of a conventional discharge valve device, FIGS. 5 and 6 are longitudinal sectional views of another example of the discharge valve device of the present invention, and FIG. 7 is a longitudinal sectional view of a conventional discharge valve device. FIG. 5... Cylinder, 14α... First valve seat surface, 5α...
・Compression chamber, 144... Second valve seat surface, 7... Main bearing, 15... Annular groove, 8... Sub bearing,
16...Communication groove, 10-...Discharge chamber, 16
cLA64 - Communication hole, 11... Discharge hole,
17...Fixing bolt. 12...Discharge valve, 16...Bentari Etai, lol l ■ /4- If Takumoto Takumi IZ Discharge 13 Benzai lower level! 4- Now, the seat I'd + 7'l-, the seat I'd- 24f, the life I ring board Noro obedience reward dark L t't Tori Mawari Holt No. Zm

Claims (1)

[Claims] A compression mechanism for sucking and compressing fluid has one end fixed to the valve fixed surface and the other free end touching and separating from the valve seat surface to open and close the discharge hole provided inside the valve seat surface. In a compressor equipped with a discharge valve, the valve seat surface has two substantially concentric circles.
The valve has a heavy structure, and an annular groove is provided between a first valve seat surface located on the outside and a second valve seat surface located on the inside, and a communication path is provided that communicates the annular groove with the discharge hole or the compression chamber. A discharge valve device for a compressor, characterized in that: