JP3081322B2 - Compressor - Google Patents

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, a Japanese Utility Model 2-259.
No. 86 is configured. Here, a conventional example will be described with reference to this publication. In FIG. 4, reference numeral 50 denotes a valve seat, on which a discharge port 51 is provided. Reference numeral 52 denotes a discharge valve for opening and closing the discharge port 51. The discharge valve is formed of a thin metal plate. Reference numeral 53 denotes a backer valve for regulating the opening of the discharge valve 52, and this backer valve is formed of a thick metal plate. 54 is a valve seat 5 in which the discharge valve 52 and the backer valve 53 are overlapped.
0 bolt.

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

[0004]

However, the conventional discharge valve 52 is a backer valve 5 made of a thick metal plate.
3 and the valve seat 50 are fixed to the valve seat 50 by the bolts 54, so that a stress acts on the fixed side at the time of opening / closing operation, and there is a problem that the valve is damaged or the number of man-hours for mounting increases.

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]

SUMMARY OF THE INVENTION The present invention provides a piston,
A cylinder on which the piston slides, a valve seat for closing the open end of the cylinder, a suction valve device mounted on the cylinder side of the valve seat, and a discharge port mounted on the opposite cylinder side of the valve seat to open and close the discharge port. In a compressor including 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 of the discharge valve devices is supported by a fulcrum in a recess provided in the valve seat. A discharge valve fitted to open and close the other, and a backer valve for regulating the opening of the discharge valve, the discharge valve is formed in an asymmetric shape in the direction from the discharge port side to the fulcrum side,
Further, the backer valve is overlapped with an end on a shorter side of a distance from a discharge port of the discharge valve to a fulcrum.

[0007]

According to the present invention, as described above,
A backer valve that holds the asymmetrically formed discharge valve is overlapped with the end on the shorter side of the distance from the discharge port to the fulcrum. It is made to become.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a sectional view of a hermetic compressor showing one 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 a valve seat. FIG. 3 is a plan view showing a state where the discharge valve device is attached to the valve seat.

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

The electric element 5 has a stator 8 with a winding 7 wound inside, a rotor 9 disposed inside the stator, and a bearing 9 for the frame 2 inserted in the center of the rotor. And a rotating shaft 11 that is supported at 10.

The compression element 4 includes a cylinder 12, a piston 14 fitted in a crank pin 13 of a rotary shaft 11 in the cylinder and reciprocatingly sliding, a valve seat 15 provided on an end face of the cylinder 12, and a valve seat 15. And a cylinder head 16 that is attached to the cylinder 12 through the cylinder head.

The valve seat 15 is provided with a suction valve device 17 on the cylinder 12 side and a discharge valve device 18 on the cylinder head 16 side. The suction valve device 17 is formed in a sheet 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 21 for holding the discharge valve. The recess 19 has a first recess 22 and the first recess 22.
And a second recess 23 obliquely communicating with the center of the recess. Further, the discharge valve 20 is formed in the same shape as the recess 19, and the engagement piece 24 fitted in the first recess 22 is formed.
A valve piece 26 for opening and closing a discharge port 25 provided in the valve seat 15 in the second recess 23 is formed in an asymmetric shape. The backer valve 21 is a valve holding piece 2 that overlaps with the engagement piece 24 of the discharge valve 20 in the first recess 22.
7 and the opening of the valve piece 26 is regulated by overlapping with the end of the valve piece 26 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 formed integrally with the valve regulating piece 28. Balf holding piece 2
Numeral 7 contacts the engagement piece 24 of the valve piece 26 and bends the discharge port 25 side to the valve seat 15 side.

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

The cylinder head 16 is formed by laminating two plates, and the plate on the valve seat 15 side has a second concave portion on the longer side from the discharge port 25 of the valve piece 26 to the engagement piece 24. A hole 32 communicating with the place 23 is provided.

In the discharge valve device for a compressor configured as described above, the discharge valve 20 has the engagement piece 24 in the first recess 22 of the recess 19 of the valve seat 15 and the engagement piece 24 in the second recess 23. The opening and closing operation is performed with the engaging piece 24 as a fulcrum by fitting the valve piece 26 to the valve piece 26. In addition, the backer valve 21 overlaps the valve holding piece 27 with the engagement piece 24 of the discharge valve 20 in the first recess 22, and has a short asymmetric discharge valve 20 in the second recess 23. By arranging the valve regulating piece 28 for regulating the opening on the side, the discharge valve 20 can be elastically pressed and the opening is regulated. The discharge valve 20 is a valve piece 2 close to the engagement 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 restricted, whereby the engaging piece 24 is twisted and broken in the first recess 22. And prevent the valve piece 26
The spring constant on the open / close side can be reduced. The discharge valve 20 is designed to reduce input during opening and closing.

The cylinder head 16 is provided with a hole 32 on the opening / closing side of the valve piece 26 in the second recess 23 of the valve seat 15 so that the passage resistance of the refrigerant flowing from inside the cylinder 12 to the cylinder head 16 can be reduced. Like that.

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 serving as a fulcrum of the opening / closing operation can be reduced.

[0019]

As described above, according to the present invention, a piston, a cylinder on which the piston slides, a valve seat for closing an open end of the cylinder, and a suction valve device mounted on the cylinder side of the valve seat. And a discharge valve device attached to the opposite side of the valve seat to open and close the 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 constituted by a discharge valve fitted to one side as a fulcrum in a recess provided in a valve seat and opening and closing the other, and a backer valve for regulating an opening degree of the discharge valve. Since the discharge valve is formed in an asymmetric shape in the direction from the discharge port side to the fulcrum side, and the backer valve is overlapped with the end on the shorter side of the distance from the discharge port to the fulcrum of the discharge valve. Vomit Can reduce the spring constant of the open side of the valve, it can be opened and closed in the discharge valve smoothly. In addition, since the discharge port can be opened widely, the passage resistance is reduced and the input can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hermetic compressor showing one 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 a valve seat according to the present invention.

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

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

[Explanation of symbols]

 DESCRIPTION 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 restricting piece

Continuation of the front page (56) References JP-A-63-309787 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04B 39/10

Claims (1)

(57) [Claims] 1. A piston, a cylinder on which the piston slides, a valve seat for closing an open end of the cylinder, a suction valve device mounted on a cylinder side of the valve seat, and a suction valve device on a side opposite to the cylinder of the valve seat. In a compressor comprising a discharge valve device attached to open and close a discharge port, and a cylinder head 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. A discharge valve fitted to open and close the other with one as a fulcrum and a backer valve for regulating the opening of the discharge valve, wherein the discharge valve is in a direction from the discharge port side to the fulcrum side. Wherein the backer valve is overlapped with the end of the discharge valve on the shorter side from the discharge port to the fulcrum.