JPS59208195A - Construction of discharge valve of compressor - Google Patents

Abstract

PURPOSE:To reduce the flow resistance in a discharge port for noise suppression and enable a discharge valve device to be applied in a small-size compressor by disposing the discharge valve device coaxially with the discharge port inside a cylinder body. CONSTITUTION:A discharge valve 16, a spring 7 and a discharge valve retainer 18 are arranged coaxially with a discharge port 15. When a gas is compressed to a pressure at which it is to be discharged, the discharge valve 16 is urged until it makes contact with the discharge valve retainer 18, then the gas is allowed to be released from a gas discharge port 15 into a muffler 9 through a gas outlet port 11. The sound of a specific frequency band is reduced at this time. When the pressure in a compressor chamber 10 is reduced below the discharge pressure, the urged discharge valve 16 is pushed back by the pressing force of the spring 7 and the pressure applied on the back of the discharge valve 16 to close the discharge port 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a discharge valve structure for a compressor used in air conditioners, refrigerators, etc.

Fig. 1 shows a conventional device shown in Utility Model Application No. 57-85661, in which 1 is a cylinder body, 2 is a piston disposed within the cylinder body 1, 3 is a drive shaft driven by a drive source,
4 and 4' are a main bearing plate and an auxiliary bearing plate that respectively close both sides of the cylinder body 1 and bear the drive shaft; 5 is a discharge port provided in the main bearing plate 4; and 6 is a discharge port that closes the discharge port 5. valve, 7 is a spring for holding the discharge valve 6, 8 is a discharge presser, 9
10 is a muffler provided to completely cover the main bearing plate 4, and 10 is a compression chamber formed within the cylinder body 1.

In the above conventional device, the cylinder body 1 and the bearing plate 4.4'
The volume of the compression chamber 10 formed in the piston 2 and the vane (not shown) is reduced by the rotation of the piston 2 through the drive #41]3'r, thereby compressing the sucked gas. The compressed gas has a discharge pressure (pressure outside the compression chamber 10)
When this happens, the discharge valve 6 is pushed up against the spring 7, and the gas flows out.

The pushed-up discharge valve 6 closes the discharge port 5 when the pressure inside the F compression chamber 10 becomes lower than the discharge pressure due to the pressure of the spring 7, the discharge presser 8, and the back of the discharge valve 6.

This series of operations is repeated during operation of the compressor.

The conventional compressor discharge valve structure is constructed as described above.
=- When trying to reduce the flow resistance of the discharge passage, since the piston 2 will block the discharge port 5, it is necessary to provide a notch in the cylinder body 1 or make the discharge port 5 larger than necessary. The drawback was that it had to be made thicker.

Furthermore, when a cylindrical valve or a flat valve is used as the discharge valve 6, there is a limit to how small the installation space can be, making it difficult to apply it to a small compressor.

The invention was made in order to eliminate the above-mentioned conventional drawbacks, and by arranging the discharge valve device in the cylinder body 1 coaxially with the discharge port, it can be applied to small compressors, and the discharge port It is an object of the present invention to provide a discharge valve structure for a compressor that can reduce flow path resistance and has a muffler function and has the effect of reducing noise at a specific frequency.

Hereinafter, embodiments of the invention will be described with reference to the drawings.

In FIGS. 2 and 3, 15 is a discharge port provided in the radial direction of the cylinder body 1, 16 is a discharge valve that fits into the discharge port 15 so as to be openable and closable, and 18 is a presser A for closing the discharge port 15. A discharge presser spring 7 is provided between the discharge presser 18 and the discharge valve 16.The discharge presser 18 is provided coaxially with the discharge port 15. Reference numeral 11 denotes a gas outlet hole that extends from the discharge port 15 through the cylinder body 1 in the axial direction and through the main bearing plate 4 to communicate with the inside of the muffler 9;
2 is a resonance type muffler provided between the discharge valve 16 and the discharge presser 18.

In the above device, the F compression chamber 10 is
The volume of the gas becomes smaller and the inhaled gas is completely compressed. When the compressed gas reaches the discharge pressure, the discharge valve 16 closes the discharge presser 1.
8, the gas flows out from the discharge port 15 into the muffler 9 through the gas outlet hole 11t. At this time, the resonance type muffler 12 reduces the sound in the F specific frequency band.

The pushed discharge valve 16 closes the discharge port 15 when the pressure in the F compression chamber 10 becomes less than the discharge pressure due to the pressing force of the spring 7 and the pressure at the back of the discharge valve 16. This series of operations is repeated while the compressor is in operation.

In the above embodiment, the discharge presser 18 and the spring 7 may be formed as separate parts so that the spring 7 also has the function of the discharge presser 18. Further, although the spring 7 is a coil spring, it may also be a leaf spring or the like.

In addition to the above, in the present invention, since the gas discharge port is provided on the cylinder body, the flow path resistance can be reduced with the same discharge port diameter compared to the case where the gas discharge port is provided on the bearing plate. Further, since the discharge valve, the discharge presser spring, and the discharge presser are provided coaxially with the discharge port, the entire discharge valve structure can be made compact. In addition, since a resonant muffler is entirely formed in the housing portion of the discharge presser spring, it is possible to provide a sound reduction effect of the gas flow.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional device, and FIGS. 2 and 3 are sectional views of uninvented devices, respectively, and partially enlarged views thereof. 1... Cylinder body, double piston, 3... Drive shaft,
4.4'...Bearing plate, 7...Discharge presser, 9.
...Muffler, 10...Compression chamber, 11...Gas outlet hole, 12...Resonance type muffler, 15...Discharge port, 16...
...Discharge valve, 18...Discharge presser. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Masuo Oiwa

Claims (2)

[Claims] (1) In a compressor in which a piston driven by a drive shaft is housed in a cylinder body, and suction gas in the cylinder body is compressed to drive the drive shaft, the piston is installed in the cylinder body in the radial direction. a discharge port for compressed gas; a discharge valve fitted to the discharge port so as to open and close the discharge port; a discharge pressing spring provided coaxially with the discharge port and pressing the discharge valve inward; The cylinder body is characterized by being completely equipped with a discharge presser which presses down the discharge valve and closes the discharge port through the spring, and a gas outlet hole which communicates the discharge valve fitting part at the discharge port of the cylinder body with the outside. Compressor discharge valve structure. (2) A discharge valve structure for a compressor, characterized in that a discharge presser spring housing portion at the discharge port is utilized as a fully resonant muffler.