WO1999028628A1

WO1999028628A1 - Reciprocating compressor

Info

Publication number: WO1999028628A1
Application number: PCT/JP1998/005402
Authority: WO
Inventors: Makoto Tabata; Kiyoshi Yoshii; Katsutoshi Enomoto; Katsuhiko Arai
Original assignee: Zexel Corporation
Priority date: 1997-12-01
Filing date: 1998-12-01
Publication date: 1999-06-10
Also published as: KR20010022024A; JP3772283B2; JPH11166479A

Abstract

A reciprocating compressor, wherein stopper plates (29, 30) comprise stopper portions (29a, 30a) and fixed portions (29e, 30e), stepped portions (29f, 30f) being formed between the stopper portions (29a, 30a) and fixed portions (29e, 30e) and used as fulcrums on which discharge valve portions (27a, 28a) are turned up.

Description

Description Reciprocating compressor Technical field

The present invention relates to a reciprocating compressor such as a swash plate compressor and an oscillating plate compressor. Background art

FIG. 5 is a partial cross-sectional view of a conventional swash plate type compressor in which a valve plate, a valve seat, and a stop plate are stacked.

The valve plate 103 is provided with a discharge port 103a for discharging the refrigerant gas from the compression chamber to the discharge chamber.

A tongue-shaped discharge valve portion 127a that opens and closes the discharge port 103a is formed in the valve sheet 127.

The stop plate 1229 is provided with a stop portion 1229a for suppressing an opening amount of the discharge valve portion 127a, and a discharge valve portion 127 is formed. A discharge hole (not shown) is formed to allow the discharge port 103a to communicate with the compression chamber when a is opened.

The valve plate 103, the valve sheet 127 and the stop plate 129 overlap each other, and the cylinder block and cylinder head (not shown) are shown. It is arranged between and. The compression chamber is formed in a cylinder block and discharges The chamber is formed in the cylinder head.

When the discharge valve section 127a is opened as shown by the two-dot chain line in Fig. 5, the compression chamber and the discharge chamber communicate with each other through the discharge port 103a and the discharge hole, and the compression chamber is opened. From there, high-pressure refrigerant gas flows into the discharge chamber.

The stopper portion 129a is formed in a shape having a predetermined angle or curvature with respect to the valve seat side end surface 129c of the fixed portion 129b.

Refrigerant gas flow is concentrated near the tip of discharge valve section 127a rather than near the boundary between discharge valve section 127b and valve body 127b, so discharge valve section 127a The impact force when sitting is increased.

As a result, there was a problem that a loud impact sound was generated when the discharge valve section moved from the position shown by the two-dot chain line in FIG. Especially during high-speed operation, the valve sheet 127 is broken, and durability is reduced.

In addition, since the opening degree near the base of the discharge valve portion 127a when the discharge valve portion 127a is opened is small, there is a problem that the refrigerant gas is difficult to flow and is over-compressed. .

Further, in order to ensure airtightness between the valve sheet 127 and the toe plate 127, the contact surface between the toe plate 127 and the valve sheet 127 is polished.

However, since the radius of curvature of the storage portion 1229a is large, when the thickness of the storage plate 1229 changes due to polishing, the valve sheet 12 The fulcrum of 7 may be greatly shifted. As a result, the amount of opening of the discharge valve changes for each cylinder, so that the flow of the refrigerant gas changes, which causes a variation in compression and large pulsation.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a reciprocating compressor having low power consumption, excellent durability, and low pulsation. And Disclosure of the invention

In order to solve the above-mentioned problems, a reciprocating compressor according to the present invention is disposed between a cylinder block having a plurality of cylinders and a cylinder head, and is provided on the cylinder block side. A high pressure chamber and a low pressure chamber located on the side of the cylinder head, and a valve plate formed on the valve plate, wherein the refrigerant gas in the compression chamber is supplied to the high pressure chamber. A discharge port, a valve member having a valve body fixed to the valve plate, and a valve section for opening and closing the discharge port; and a stop for suppressing the opening amount of the valve section. A reciprocating compressor comprising: a stopper member having a stopper portion and a fixing portion fixed to the valve plate via the valve body. Steps are formed between them And wherein the door.

Since a step is formed between the tongue and the fixed part, the position of the fulcrum when the valve is lifted becomes constant and the amount of lift of each valve becomes uniform, so compression is achieved. Eliminates fluctuations and reduces pulsation. In addition, the valve opening near the fulcrum at the time of lift increases, and the flow of the refrigerant gas becomes better, so that over-compression is prevented. Power consumption is reduced. Furthermore, the refrigerant gas is not concentrated at the tip of the valve portion, and the impact force applied to the valve portion when the discharge valve is closed is reduced, so that noise is reduced and the durability of the discharge valve is reduced. Is improved. -The reciprocating compressor according to the present invention is characterized in that a step-side corner of the fixed portion, which becomes a fulcrum when the valve portion is opened, has a curved shape.

When the valve is opened, the valve is supported by the surface, and the force acting on the valve is dispersed, so that the durability of the valve member is improved. BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a cross-sectional view along the line 1A-1A in Fig. 4 (a). Fig. 1 (a) shows the valve when it is open, and Fig. 1 (b) shows the valve when it is closed. It is a figure which shows each state.

FIG. 2 is a longitudinal sectional view of the swash plate type compressor according to one embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a valve plate, a valve sheet, and a top plate.

Fig. 4 (a) is a plan view of a part of the stop plate when a noble plate, a valve sheet and a stop plate are stacked, and Fig. 4 (b) is a plan view of Fig. 4 ( a) is a sectional view taken along line 4B-4B of FIG.

FIG. 5 is a partial cross-sectional view of a conventional swash plate compressor in which a valve plate, a valve sheet, and a top plate are stacked. BEST MODE FOR CARRYING OUT THE INVENTION

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

FIG. 2 is a vertical sectional view of a swash plate type compressor according to one embodiment of the present invention.

The front-side cylinder block 1 and the rear-side cylinder block 2 are axially opposed to each other. One end of the joined cylinder blocks 1 and 2 is connected via a valve plate 3, a valve sheet (valve member) 27 and a stop plate (stopper member) 29. The front head 4 is fixed, and the other end is connected via a valve plate 5, a valve sheet (valve member) 28 and a stop plate (stopper \ ° member) 30. Head 6 is fixed.

A shell 13 on the front side is provided on the front head 4, and a shell 14 on the rear side is provided integrally on the rear head 6. The front shell 13 and the front shell 13 are provided integrally. The shell 14 is fitted to the shell 14 via the O-ring 38 in the axial direction.

The front head 4, the cylinder blocks 1 and 2, the shells 13 and 14, and the rear head 6 are axially connected by a through port 39.

A drive shaft 7 is provided at the center of the cylinder blocks 1 and 2, and a swash plate 8 is fixed to the drive shaft 7, and the drive shaft 7 and the swash plate 8 are mounted on bearings 9 and 1. It is rotatably supported by 0. The swash plate 8 is inclined with respect to an imaginary plane orthogonal to the drive shaft 7.

A plurality of cylinders 11 are installed in cylinder blocks 1 and 2. Has been damaged. Each of the cylinders 11 is parallel to the drive shaft 7 and is arranged at predetermined intervals in a circumferential direction around the drive shaft 7. A piston 12 is slidably accommodated in each cylinder 11.

Compression chambers 21 and 22 are formed on both sides of the piston 12 in each cylinder 11. The piston 12 is connected to the swash plate via a substantially hemispherical shroud 19, 20. The piston 12 reciprocates in the cylinder 11 as the swash plate 8 rotates. Exercise 9 '.

Fig. 3 is an exploded perspective view showing a valve plate, a valve sheet, and a stop plate, and Fig. 4 (a) shows a valve plate, a valve sheet, and a top plate in an overlaid state. Fig. 4 (b) is a cross-sectional view taken along line 4B-4B in Fig. 4 (a), and Fig. 4 is a cross-sectional view of a part of the storage plate. Fig. 1 (a) is a cross-sectional view taken along the line 1A-1A. Fig. 1 (a) shows the state when the valve is open, and Fig. 1 (b) shows the state when the valve is closed. is there.

Discharge ports 3a and 5a for discharging refrigerant gas from the compression chambers 21 and 22 to the discharge chamber (high-pressure chamber) 24 are supplied to the substantially disk-shaped valve plates 3 and 5, and are sucked in during suction. Suction valve escape holes 3b, 5b for allowing the valve sections 27d, 28d to escape to the compression chambers 21, 22 side, and port through holes 3c, 5 for inserting through ports 39. c is formed respectively.

The suction valve escape holes 3b and 5b are adjacent to the suction ports 29d and 30d via the suction valve portions 27d and 28d, respectively. Inlet port when 8d is open Communicates with 29 d and 30 d.

The substantially disk-shaped valve sheets 27 and 28 have tongue-shaped discharge valve parts (valve parts) 27a and 28a and tongue-shaped suction valve parts 27d and 28d. Each of the cutouts is formed, and port through holes 27c and 28c are formed.

The substantially disk-shaped stop plates 29, 30 include stopper portions 29a, 30a for suppressing the opening or deformation of the discharge valve portions 27a, 28a. The suction ports (29d, 30d) for sucking the refrigerant gas from the suction chamber (low-pressure chamber) 23 into the compression chambers 21 and 22 and the bolt through holes 29c and 30c are provided. Each is formed.

In addition, the stop plates 29, 30 have a stove,. Department

Discharge holes 29b and 30b are formed along the longitudinal direction of 29a and 30a.

As shown in FIG. 1, the stopper portions 29a and 30a are formed by grooves formed on the compression chamber side end surfaces of the stop plates 29 and 30. Step portions 29f and 30f are formed between the opening portions 29a and 30a and the fixed portions 29e and 30e. The stepped corner P of the fixed portions 29 e, 30 e of the stop plates 29, 30, which serves as the fulcrum of the discharge valve portion 27 a 28 a during lifting, has a curved shape .

When the valve plates 3 and 5 are overlapped with the valve sheets 27 and 28 and the stop plates 29 and 30, the discharge port

The discharge valves 3 a and 5 a face the discharge valves 27 a and 28 a, and discharge ports 3 a and 5 a of the valve plates 3 and 5 and discharge of the stop plates 29 and 30. Via holes 29b and 3Ob The compression chambers 21 and 22 communicate with the discharge chamber 24.

The valve bodies 27 e, 28 e connected to the discharge valve sections 27 a, 28 a are fixed to the fixed parts 29 e, 30 e of the toe plates 29, 30 and the knob plate 3, It is fixed by 5 and.

Next, the operation of the swash plate type compressor of this embodiment will be described. When the drive shaft 7 rotates, the swash plate 8 also rotates integrally. The rotation of the swash plate 8 causes the piston 12 to reciprocate in the cylinder 11. The swash plate 8 rotates 1 Z2 from the position where piston 1 2 is closest to valve plate 3 (when piston 12 is located at the top dead center on the compression chamber 21 side). Then, the piston 12 moves to the valve plate 5 side, the suction stroke is completed in the compression chamber 21 side, and the compression stroke and the discharge stroke are completed in the compression chamber 22. When the swash plate 8 further rotates by ら from this state, the suction stroke is completed in the compression chamber 22, and the compression stroke and the discharge stroke are completed in the compression chamber 21.

In the suction stroke, the suction valve portions 27d and 28d elastically deform to the suction valve release holes 3b and 5b, and the suction ports 29d and 30d and the suction valve release holes. Low-pressure refrigerant gas flows into the compression chambers 21 and 22 through 3b and 5b.

In the discharge stroke, the discharge valves 27a and 28a are elastically deformed toward the discharge chamber side by the refrigerant gas compressed in the compression chambers 21 and 22 and the discharge ports 3a and 5a The high-pressure coolant gas is discharged from the compression chambers 21 and 22 to the discharge chamber 24 through the discharge holes 29b and 30b.

Steps 29 f, 30 f 各 Each discharge valve part 27 a, 28 The position of the fulcrum when a is lifted becomes constant and the amount of lift of each discharge valve part 27a, 28a becomes uniform, so that there is no variation in compression, and compression The pulsation due to the variation of the pulsation is reduced. -Also, when the discharge valve sections 27a and 28a are opened, the steps 27f and 28f near the fulcrum of the discharge valve sections 27a and 28a due to the discharge pressure of the refrigerant gas. 28 f (see Fig. 1 (a)) is formed, the valve opening of the discharge valve sections 27a and 28a increases, and the flow of refrigerant gas is improved. Power consumption is reduced.

Further, the flow of the refrigerant gas does not concentrate on the leading end of the discharge valve portions 27a, 28a, and when the discharge valve portions 27a, 28a are closed, the discharge valve portions 27a, 28a, Since the impact force applied to 28 a is reduced, noise is reduced and the durability of the discharge valve sections 27 a and 28 a is improved.

Also, when the discharge valve portions 27a and 28a are opened, the discharge valve portions 27a and 28a are connected to the fixed portions 29e and 3Oe of the top plate 29 and 30. It is supported by the curved surface of the step side corner P, and the force acting on the discharge valves 27a and 28a is not concentrated at one place, so the durability of the discharge valves 27a and 28a Is improved.

In the above embodiment, the invention of the present application is applied to a swash plate type compressor with a shell. However, the invention can be applied to a compressor having no shell. Industrial applicability

As described above, the reciprocating compressor according to the present invention It is useful as a refrigerant compressor for air conditioners.

Claims

The scope of the claims

1. A compression chamber disposed between a cylinder block having a plurality of cylinders and a cylinder head and located on the cylinder block side and the cylinder head side A valve plate separating the high pressure chamber and the low pressure chamber located at

A discharge port formed in the valve plate for discharging refrigerant gas from the compression chamber to the high-pressure chamber;

A valve member having a valve body fixed to the valve plate and a valve section for opening and closing the discharge port;

A reciprocating compressor comprising: a stopper for suppressing an opening amount of the valve portion; and a stopper member having a fixing portion fixed to the valve plate via the valve body. ,

A reciprocating compressor, wherein a step portion is formed between the stop portion and the fixed portion.

2. The reciprocating compressor according to claim 1, wherein a step-side corner of the fixed portion, which becomes a fulcrum when the valve portion is opened, has a curved shape.