JPH0533770A - Compressor - Google Patents

Abstract

PURPOSE:To prevent stress concentration on the fixed side of a discharge valve and simplify the fitting operation. CONSTITUTION:A discharge valve device 18 is constituted of a discharge valve 20 arranged in the recessed place 19 of a valve seat 15 and a backer valve 21 to regulate the opening of the discharge valve. The discharge valve and the backer valve are sandwiched between the projection 25 of a cylinder head 16 and the valve seat 15 through the extended part 23 of a gasket 22. A slit 24 is provided on the joint side of the extended part.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A conventional compressor discharge valve device is constructed, for example, as disclosed in Japanese Utility Model Publication No. 2-25986. Here, a conventional example will be described with reference to this publication.
In FIG. 5, reference numeral 50 is a valve seat, and a discharge hole 51 is provided in this valve seat.
Is provided. A discharge valve 52 opens and closes the discharge hole 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 discharge valve device having this structure, the opening of 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 bolt 3 together with No. 3, there is a problem that stress acts on the fixed side at the time of opening / closing operation, the valve is damaged, and the number of work steps at the time of mounting increases.

The present invention solves the above problems,
While reducing the stress generated on the fixed side of the discharge valve,
An object of the present invention is to provide a compressor that improves the assemblability of a discharge valve device.

[0006]

The present invention comprises a piston and
A cylinder on which the piston slides, a valve seat that seals the open end of the cylinder, a suction valve device that is mounted on the cylinder side of the valve seat, and a discharge valve device that is mounted on the opposite cylinder side of the valve seat. 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 a valve seat, and a backer valve that regulates the opening degree of the discharge valve, and the cylinder head discharges with the backer valve via a gasket. A protrusion is formed to press the valve against the valve seat.

[0007]

The present invention is constructed as described above,
The discharge valve and the backer valve are pressed against the valve seat by the protrusion of the cylinder head through the gasket to improve the mounting work of the discharge valve and the backer valve, and the discharge valve and the backer valve are fixed by the protrusion when opening and closing. The concentration of stress on the gasket can be suppressed with a gasket.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 where the discharge valve and the suction valve are attached to the valve seat. FIG. 3 is a front view showing a state in which the discharge valve device is attached to the valve seat. FIG. 4 is a sectional view taken along the line AA of FIG.

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 having a winding 7 therein, a rotor 9 disposed inside the stator, and a bearing 10 of the frame body 2 inserted in the center of the rotor 9. And a rotary shaft 11 which is supported by.

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 slides back and forth in the cylinder 12, a valve seat 15 provided on an end face of the cylinder 12, and a valve of this valve. And a cylinder head 16 attached to the cylinder 12 via a seat.

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 includes a discharge valve 20 mounted in a recess 19 provided in the valve seat 15, and a backer valve 2 that regulates the opening degree of the discharge valve.
It is composed of 1 and 1. These discharge valve and backer valve are formed of a thin elastic material.

Reference numeral 22 denotes a gasket interposed between the valve seat 15 and the cylinder head 16, and this gasket is provided with an extension portion 23 extending toward the fixed side of the discharge valve 20 and the backer valve 21. A slit 24 is formed on the base side of the extension.

The cylinder head 16 is formed with a projection 25 that projects toward the valve seat 15. This protrusion is made by push molding. The discharge valve 20 and the backer valve 21 are sandwiched between the protrusion 25 of the cylinder head 16 and the valve seat 15 via the extension portion 23 of the gasket 22 by fixing the cylinder head 16 to the cylinder 21 with the bolt 26.

A discharge hole 27 is provided in the recess 19 of the valve seat 15 and is opened and closed by the discharge valve 20.

In the compressor thus constructed, the assembly sequence will be described. First, the valve seat 15 is set on the end surface of the cylinder 12 via the suction valve device 17. A discharge valve 20 and a backer valve 21 are set in the recess 19 of the valve seat. A gasket 22 is placed on the valve seat 15 in which the discharge valve and the backer valve are set. At this time, the extension portion 23 of the gasket is placed on the backer valve 21. Finally, the cylinder head 16
Is attached to the cylinder 12 with a bolt 26 via the valve seat 15. By mounting this cylinder head, the discharge valve 20 and the backer valve 21 are sandwiched between the projection 25 and the valve seat 15 via the extension portion 23 of the gasket 22.

The extension portion 23 of the gasket 22 is formed with a slit 24 on the base side thereof so that the cylinder head 1
The protrusion 25 of No. 6 easily deforms when pushed toward the valve seat 15.

Since the discharge valve 20 and the backer valve 21 are sandwiched between the projection 25 and the valve seat 15 via the gasket 22, the discharge valve 20 and the backer valve 21 are securely fixed by the elasticity of the gasket itself and serve as a fulcrum during the opening / closing operation. The stress concentration on the side can be relaxed. Moreover, the discharge valve 20 and the backer valve 21 are attached by being sandwiched between the valve seat 15 and the cylinder head 16, so that fixing bolts and the like are not required and workability can be improved.

[0020]

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 cylinder head fixed to the cylinder through the valve seat so as to cover the discharge valve device, and the discharge valve device is provided on the valve seat. And a backer valve that regulates the opening degree of the discharge valve, and the cylinder head has a protrusion that presses the backer valve and the discharge valve against the valve seat via a gasket. Therefore, the discharge valve and the backer valve can be elastically attached to the valve seat side via the gasket with the protrusion of the cylinder head, and the work of attaching the discharge valve device can be performed easily. It can be in. Moreover, the present invention provides a slit on the base side of the extension portion of the gasket sandwiched between the discharge valve device and the protrusion, so that the extension portion of the gasket can be easily bent when pressed by the protrusion. is there.

[Brief description of 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 a discharge valve and a suction valve are attached to the valve seat of the present invention.

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

4 is a cross-sectional view taken along the line AA of FIG. 3 of the present invention.

FIG. 5 is a sectional view of a conventional discharge valve device.

[Explanation of symbols]

 12 cylinders 14 pistons 15 valve seats 16 cylinder heads 17 suction valve devices 18 discharge valve devices 19 recesses 20 discharge valves 21 backer valves 25 protrusions

Claims (1)

Claim: What is claimed is: 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 the valve. In a compressor provided with a discharge valve device mounted on the anti-cylinder side of a seat and a cylinder head fixed to the valve seat via a gasket so as to cover the discharge valve device, the discharge valve device is provided on the valve seat. And a backer valve that regulates the opening of the discharge valve, and the cylinder head has a protrusion that presses the backer valve and the discharge valve against the valve seat via a gasket. A compressor characterized by being formed.