JPH09137779A - Refrigerant compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a moving space to increase lift quantity of a discharge lead valve and to reduce vibration and noise accompanying movement of the discharge lead valve. SOLUTION: An intake lead valve, a valve seat plate 15 on which an intake hole and a discharge hole 23 are formed, a discharge lead valve 25 having a cover part 25B to open and close the discharge hole 23, a valve backer 26 to regulate lift quantity of the discharge lead valve 25, a gasket 18 and a head plate 16 on which a discharge muffler is arranged are sequentially installed on an end part of a cylinder of a compression element. A recessed part 30 is provided on a part corresponding to the cover part 25B of the discharge lead valve 25 of the head plate 16, and a space S in which the discharge lead valve 25 moves to open and close is formed. A thin plate 31 consisting of high vibrationproofing metal or plastic is arranged on a bottom surface of the recessed part 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant compressor used in a refrigerator or the like, and particularly to an improvement of a discharge valve device in a reciprocating refrigerant compressor.

[0002]

2. Description of the Related Art A conventional reciprocating type refrigerant compressor is disclosed in, for example, Japanese Patent Laid-Open No. 5-149256. In this compressor, a compression element that sucks and compresses a refrigerant from an external refrigerant circuit and an electric element that drives a piston thereof are housed in a closed container. The compression element is constructed by attaching a valve seat plate having suction holes and discharge holes to the end of the cylinder, and further attaching a head plate. A suction reed valve is provided on the cylinder side of the valve seat plate, and a discharge reed valve is provided on the opposite side. The suction reed valve and the discharge reed valve open and close the openings of the suction hole and the discharge hole of the valve seat plate, respectively, according to the reciprocating movement of the piston in the cylinder.

As shown in the sectional view of the discharge valve device of FIG.
The discharge reed valve 25 is housed in a discharge valve recess 24 formed in the valve seat plate 15 together with a valve backer 26 that regulates the lift amount of the discharge reed valve 25. At the fulcrum parts of the discharge reed valve 25 and the valve backer 26, the protrusions 29 provided on the head plate are made of an elastic member and the gasket 18
The tongue piece 18A is pressed and deformed and held. The opening of the discharge hole 23 formed in the valve seat plate 15 is defined by the discharge reed valve 2
5 is elastically deformed using the fulcrum portion as a fulcrum, and is opened and closed by the lid portion 25B. The discharge reed valve 25 opens and closes in a space SS formed between the recess 24 of the valve seat plate 15 and the head plate 16. The height of this space SS is adjusted by the plate thickness of the gasket 18.

The valve backer 26 is bent at two places, and a regulating end portion 26B having a predetermined distance from the lid portion 25B of the discharge reed valve 25 is arranged close to the head plate 16.

[0005]

Since the discharge reed valve 25 opens and closes in the space, its lift amount is limited by the height of the space SS. To increase the lift amount, the space height must be increased. The height of the space SS is
The thickness can be adjusted by the plate thickness of the gasket 18 interposed between the valve seat plate 15 and the head plate 16, but the plate thickness must be increased, which increases the cost.

When the discharge reed valve 25 opens and hits the valve backer 26 in the opening / closing operation of the discharge reed valve 25, the regulating end portion 26B of the valve backer 26 is urged toward the head plate 16 to the wall surface of the head plate 16. Contact. At this time, since both the valve backer 26B and the head plate 16 are made of a metallic material, there is a problem that noise and vibration occur.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a refrigerant compressor capable of reducing the cost and suppressing noise and vibration.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to an electric element provided in an airtight container, a compression element having a cylinder provided in the airtight container and having a piston reciprocally driven by the electric element, and a suction hole. And a valve seat plate formed with a discharge hole and attached to the end of the cylinder, a discharge reed valve having a lid portion for opening and closing the opening of the discharge hole, and a head provided with a discharge muffler and attached to the valve seat plate via a gasket. In the refrigerant compressor including the plate, a recess is provided at a position corresponding to the lid portion of the discharge reed valve of the head plate. The height of the space for the opening / closing operation of the discharge reed valve can be adjusted by the recess provided in the head plate, and the lift amount of the discharge reed valve can be increased without increasing the plate thickness of the gasket. Further, even when a valve backer for restricting the opening degree is provided on the back side of the discharge reed valve, the recess is provided similarly.

Then, a thin plate made of metal or plastic having a high vibration damping property is disposed on the bottom surface of the recess provided in the head plate. During the opening / closing operation of the discharge reed valve, the lid of the discharge reed valve or the end of the valve backer contacts the thin plate, so that noise and vibration are suppressed.

[0010]

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

FIG. 1 is a sectional view of a refrigerant compressor of the present invention. In the figure, reference numeral 1 is a closed container composed of an upper container and a lower container, which are frame bodies 2 and 3 composed of two parts, a compression element 4 arranged above the frame bodies 2 and 3, and a lower part. The electric element 5 arranged on the side is housed. 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 wound therein, and a rotor 9 arranged inside the stator 8.
The rotor 9 is attached to the center of the rotor 9 and is constituted by a rotary shaft 11 rotatably supported by a bearing 10 of the frame body 2.

The compression element 4 includes a cylinder 12 and a rotary shaft 11.
The piston 14 that reciprocates in the cylinder 12 by the eccentric rotation of the crank pin 13, the valve seat plate 15 provided on the end surface of the cylinder 12, and the head plate attached to the cylinder 12 via the valve seat plate 15. 16 and 16.

FIG. 2 is an exploded view of the components attached to the end of the cylinder. These intake valve plate 17 and valve seat plate 1
5, the gasket 18, and the head plate 16 are bolted to the cylinder end in the order shown. The suction valve plate 17 is made of a thin metal plate, and a suction reed valve 19 is formed by a notch 20. Inhalation reed valve 19
A cutout hole 21 for a discharge hole is formed in the. The valve seat plate 15 is made of a sintered metal plate, and has a suction hole 22 and a discharge hole 23.
And a discharge reed valve recess 24. Suction hole 2
The opening 2 is opened and closed by the suction reed valve 19. Discharge hole 2
3 is provided in the discharge reed valve recess 24, and a discharge reed valve 25 that opens and closes the opening and a valve backer 26 that regulates the lift amount of the discharge reed valve are provided in the discharge reed valve 2 2.
It is stored in 4. The gasket 18 is made of an elastic material such as butyl rubber containing fibers, and is provided with a tongue piece 18A that holds the fulcrum portions 25A and 26A of the discharge reed valve 25 and the valve backer 26.

The head plate 16 is a flat metal plate,
A plurality of expansion chambers 27 are provided, each of which is provided with a passage hole 28 for the refrigerant discharged from the cylinder 12 corresponding to the discharge hole 23 of the valve seat plate 15, and through which the refrigerant is introduced.
A discharge muffler consisting of is attached.

As shown in FIG. 3, in order to hold the support portions 25A, 26A of the discharge reed valve 25 and the valve backer 26, the head plate 16 is provided with a protrusion 29 for pressing the tongue piece 18A of the gasket 18 toward the cylinder side. Has been. The lid portion 2 of the discharge reed valve 25 of the head plate 16
A recess 30 is provided in a portion facing 5B. The recess 30 is formed by determining the depth thereof according to the lift amount of the discharge reed valve 25. A space S is formed by the recess 30 and the discharge valve recess 24 of the valve seat plate 15, and a space for opening and closing the discharge reed valve 25 is secured. Therefore, when increasing the lift amount of the discharge reed valve 25, it is not necessary to increase the plate thickness of the gasket 18 as in the conventional case.

On the bottom surface of the recess 30 of the head plate 16, a thin plate 3 made of metal or plastic having a high vibration damping property is provided.
1 is attached with an adhesive or the like. As the metal having a high vibration isolation property, for example, an iron-based or copper-based alloy can be used. As the plastic, for example, PBT (polybutylene terephthalate) can be used.

During the opening / closing operation of the discharge reed valve 25, the valve backer 26 is biased toward the head plate 16 by the lid portion 25B of the discharge reed valve 25, and the regulating end portion 26B of the valve backer 26 hits the thin plate 31. Therefore, the generation of noise and vibration is suppressed.

[0019]

As described above, in the refrigerant compressor of the present invention, the space for opening and closing the discharge reed valve is secured by providing the recess in the head plate. The lift amount of the discharge reed valve can be increased without increasing the thickness of the gasket interposed therebetween. As a result, the material cost of the gasket can be saved and the cost can be reduced.

Further, by mounting a thin plate made of metal or plastic having a high vibration damping property on the bottom surface of the recess, noise and vibration can be suppressed by the contact of the valve backer.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a refrigerant compressor of the present invention.

FIG. 2 is an exploded view showing components attached to a cylinder end portion of the refrigerant compressor of the present invention.

FIG. 3 is a cross-sectional view of essential parts showing a discharge valve device for a refrigerant compressor of the present invention.

FIG. 4 is a cross-sectional view of essential parts showing a conventional discharge valve device of a refrigerant compressor.

[Explanation of symbols]

 1 Closed Container 4 Compressive Element 5 Electric Element 12 Cylinder 14 Piston 15 Valve Seat Plate 16 Head Plate 18 Gasket 23 Discharge Hole 25 Discharge Reed Valve 26 Valve Backer 30 Recess 31 Thin Plate

Claims (3)

[Claims] 1. A compression element having an electric element provided in a closed container, and a compression element having a cylinder provided in the closed container and having a piston reciprocally driven by the electric element.
A valve seat plate having suction and discharge holes and attached to the end of the cylinder, a discharge reed valve having a lid portion for opening and closing the opening of the discharge hole, and a discharge muffler provided with a gasket for the valve seat plate. A refrigerant compressor provided with a head plate mounted via the head plate, wherein a recess is provided at a position of the head plate corresponding to the lid portion of the discharge reed valve. 2. An electric element provided in the closed container, and a compression element having a cylinder in which a piston provided in the closed container and reciprocally driven by the electric element is arranged.
A valve seat plate formed with an intake hole and a discharge hole and attached to the end portion of the cylinder, a discharge reed valve having a lid portion for opening and closing the opening of the discharge hole, and the discharge provided on the back side of the discharge reed valve. In a refrigerant compressor including a valve backer for controlling a lift amount of a reed valve and a head plate provided with a discharge muffler and attached to the valve seat plate via a gasket, a lid portion of the discharge reed valve of the head plate. A refrigerant compressor characterized in that a recess is provided at a position corresponding to. 3. The refrigerant compressor according to claim 1, wherein a thin plate made of metal or plastic having high vibration damping property is provided on a bottom surface of the recess.