JPH05149256A - Compressor - Google Patents

Abstract

PURPOSE:To prevent concentration of stress in a fixed side of a delivery valve and also to smooth opening/closing action of this delivery valve. CONSTITUTION:A delivery valve device 18 is constituted of a delivery valve 20 mounted into a recessed part 19 provided in a valve seat 15 and a backer valve 21 of holding this delivery valve. The recessed part 19 is formed of the first recessed part 22 and the second recessed part 23 connected obliquely in the center of this first recessed part. The delivery valve 20 is formed in an asymmetrical shape of an engaging piece 24 fitted to the first recessed part 22 and a valve piece 26 of opening/closing a delivery port 25 provided in the valve seat 15 in the second recessed part 23. The backer valve 21 is formed integrally of a valve holding piece 27 piled together on the engaging valve 24 of the delivery valve 20 in the first recessed part 22 and a valve restricting piece 28 for restricting an opening of the valve piece 26 piled together at an end on the short side from the delivery port 25 of the valve piece 26 to the engaging piece 24 of the delivery valve 20 in the second recessed part 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor for regulating a discharge valve.

[0002]

2. Description of the Related Art A conventional compressor is, for example, Japanese Utility Model No. 2-259.
It is configured as shown in Japanese Patent Publication No. 86. Here, a conventional example will be described with reference to this publication. In FIG. 4, a valve seat 50 is provided with a discharge port 51. A discharge valve 52 opens and closes the discharge port 51, and this discharge valve is formed of a thin metal plate. Reference numeral 53 is a backer valve that controls the opening of the discharge valve 52, and this backer valve is formed of a thick metal plate. Reference numeral 54 designates the valve seat 5 by overlapping the discharge valve 52 and the backer valve 53.
It is a bolt to be attached to 0.

In the compressor of this structure, the opening degree by opening and closing the discharge valve 52 is regulated by the backer valve 53.

[0004]

However, the conventional discharge valve 52 is a backer valve 5 formed of a thick metal plate.
Since it is fixed to the valve seat 50 with the bolts 3 together with 3, the stress acts on the fixed side during the opening / closing operation, which causes problems such as damage to the valve and a large number of man-hours for mounting.

The present invention solves the above problems,
While reducing the stress generated on the fixed side of the discharge valve,
It is an object of the present invention to provide a compressor that smoothly opens and closes the discharge valve.

[0006]

The present invention comprises a piston and
A cylinder on which this piston slides, a valve seat that seals the open end of this cylinder, a suction valve device that is mounted on the cylinder side of this valve seat, and a discharge port that is mounted on the opposite cylinder side of the valve seat to open and close the discharge port. In a compressor provided with a discharge valve device and a cylinder head fixed to a cylinder via a valve seat so as to cover the discharge valve device, one end of the discharge valve device is supported in a recess provided in the valve seat. As a discharge valve fitted to open and close the other, and a backer valve that regulates the opening of the discharge valve, the discharge valve is formed in an asymmetric shape from the discharge port side toward the fulcrum side,
In addition, the backer valve is superposed on the end of the discharge valve on the side where the distance from the discharge port to the fulcrum is short.

[0007]

The present invention is constructed as described above,
A backer valve that holds the discharge valve formed in an asymmetric shape is overlapped with the end on the side where the distance from the discharge port to the fulcrum is short, to prevent stress from concentrating on the fulcrum when opening and closing, and to open and close the valve smoothly. It was made to become.

[0008]

The present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a hermetic compressor showing an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a state in which the discharge valve device and the suction valve device are mounted on the valve seat. FIG. 3 is a plan view showing a state in which the discharge valve device is attached to the valve seat.

Reference numeral 1 denotes an airtight container, in which a frame body 2 and 3 consisting of two parts, a compression element 4 arranged on the upper side of the frame body, and an electric element 5 arranged on the lower side thereof. It is stored. The compression element 4 and the electric element 5 are elastically attached to the inner wall of the closed container 1 via a support device 6.

The electric element 5 includes a stator 8 in which a winding 7 is wound, a rotor 9 arranged inside the stator, and a bearing of the frame body 2 inserted in the center of the rotor 8. The rotary shaft 11 is supported by 10.

The compression element 4 includes a cylinder 12, a piston 14 which is fitted in a crank pin 13 of a rotary shaft 11 and reciprocally slides in the cylinder 12, a valve seat 15 provided on an end surface of the cylinder 12, and a valve seat. And a cylinder head 16 attached to the cylinder 12 via

A suction valve device 17 is attached to the valve seat 15 on the cylinder 12 side, and a discharge valve device 18 is attached to the cylinder head 16 side. The suction valve device 17 is formed in a seat shape having substantially the same size as the valve seat 15. The discharge valve device 18 is composed of a discharge valve 20 mounted in a recess 19 provided in the valve seat 15 and a backer valve 21 that holds this discharge valve. The recess 19 includes the first recess 22 and the first recess 22.
And a second recess 23 that obliquely communicates with the center of the recess. Further, the discharge valve 20 is formed in the same shape as the recess 19, and the engaging piece 24 fitted into the first recess 22.
And a valve piece 26 that opens and closes the discharge port 25 provided in the valve seat 15 in the second recess 23 are formed in an asymmetrical shape. The backer valve 21 overlaps the engagement piece 24 of the discharge valve 20 in the first recess 22 with the valve holding piece 2
7, and the opening of the valve piece 26 is superposed on the end of the discharge piece 20 of the discharge valve 20 on the shorter side from the discharge port 25 side to the engagement piece 24 in the second recess 23. It is integrally formed with the valve regulating piece 28. Balkh holding piece 2
7 contacts the engagement piece 24 of the valve piece 26, and bends the discharge port 25 side toward the valve seat 15 side.

The backer valve 21 is a cylinder head 16
Is fixed to the cylinder 12 with bolts 29, and is clamped by the valve pressing portion 31 of the gasket 30 between the cylinder head and the valve seat 15.

The cylinder head 16 is formed by stacking two plates, and the plate on the valve seat 15 side is provided with a second recess on the long side from the discharge port 25 of the valve piece 26 to the engaging piece 24. A hole 32 communicating with the place 23 is provided.

In the discharge valve device of the compressor constructed as described above, the discharge valve 20 has the engaging piece 24 in the first recess 22 of the recess 19 of the valve seat 15 and the second recess 23 in the second recess 23. By engaging the valve piece 26 with the valve piece 26, the engaging piece 24 is used as a fulcrum to open and close. Further, the backer valve 21 overlaps the valve holding piece 27 with the engaging piece 24 of the discharge valve 20 in the first recess 22, and the asymmetric discharge valve 20 has a short length in the second recess 23. By arranging the valve restricting piece 28 for restricting the side opening, the discharge valve 20 can be elastically pressed and the opening can be restricted. The discharge valve 20 is a valve piece 2 adjacent to the engaging piece 24.
6 is elastically held by the valve holding piece 27 and the opening degree of the valve piece 26 on the shorter side is regulated, whereby the engagement piece 24 is twisted and damaged in the first recess 22. And the valve piece 26
The spring constant on the opening and closing side of is designed to be small. The discharge valve 20 is designed to reduce the input when opening and closing.

Further, the cylinder head 16 is provided with the hole 32 on the opening / closing side of the valve piece 26 of the second recess 23 of the valve seat 15, whereby the passage resistance of the refrigerant flowing from the inside of the cylinder 12 to the cylinder head 16 can be reduced. I am trying.

The backer valve 21 elastically holds the discharge valve 20 with a valve holding piece 27, so that the discharge valve 20
The stress concentration on the side that serves as the fulcrum of the opening and closing operation of is relaxed.

[0019]

As described above, according to the present invention, the piston, the cylinder on which the piston slides, the valve seat that seals the open end of the cylinder, and the suction valve device mounted on the cylinder side of the valve seat. And a discharge valve device attached to the opposite cylinder side of the valve seat to open and close a discharge port, and a cylinder head fixed to the cylinder via a valve seat so as to cover the discharge valve device. The discharge valve device is composed of a discharge valve fitted in a recess provided in the valve seat, one of which is a fulcrum, and the other of which is fitted to open and close, and a backer valve which regulates the opening degree of the discharge valve. Since the discharge valve is formed in an asymmetrical shape in the direction from the discharge port side to the fulcrum side, and the backer valve is superposed on the end of the discharge valve on the short side distance from the discharge port to the fulcrum, Vomiting Can reduce the spring constant of the open side of the valve, it can be opened and closed in the discharge valve smoothly. Moreover, since the discharge port can be opened wide, the passage resistance is reduced and the input can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a hermetic compressor showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a state in which a discharge valve device and a suction valve device are mounted on the valve seat of the present invention.

FIG. 3 is a plan view showing a state in which a discharge valve device is attached to the valve seat of the present invention.

FIG. 4 is a sectional view of a conventional discharge valve device.

[Explanation of symbols]

 12 cylinder 14 piston 15 valve seat 16 cylinder head 17 suction valve device 18 discharge valve device 19 recess 20 discharge valve 21 backer valve 27 valve holding piece 28 valve regulating piece

Claims (1)

[Claims] 1. A piston, a cylinder on which the piston slides, a valve seat that seals the open end of the cylinder, a suction valve device mounted on the cylinder side of the valve seat, and a cylinder side opposite to the valve seat. In a compressor provided with a discharge valve device which is attached to open and close a discharge port, and a cylinder head which is fixed to a cylinder via a valve seat so as to cover the discharge valve device, the discharge valve device is provided on the valve seat. It is composed of a discharge valve fitted so as to open and close the other with one as a fulcrum in the recess and a backer valve that regulates the opening degree of the discharge valve, and the discharge valve is directed from the discharge port side to the fulcrum side. The compressor is characterized in that the backer valve is formed in an asymmetrical shape, and is superposed on the end of the discharge valve on the side where the distance from the discharge port to the fulcrum is short.