JP2005248871A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor provided with a cylinder block having a cylinder bore, a piston reciprocating and moving in the cylinder bore, a valve plate in which an absorption hole for leading compressed fluid into the cylinder bore and a discharge hole for leading the compressed fluid in the cylinder bore outside the cylinder bore are formed, an absorption valve like a belt plate opening and closing the absorption hole, and a discharge valve like a belt plate opening and closing the discharge hole to prevent breakage of a tip of the absorption valve. <P>SOLUTION: This compressor is provided with the cylinder block having the cylinder bore, the piston reciprocating and moving in the cylinder bore, the valve plate in which the absorption hole for leading compressed fluid into the cylinder bore and the discharge hole for leading the compressed fluid in the cylinder bore outside the cylinder bore are formed, the absorption valve like the belt plate opening and closing the absorption hole, and the discharge valve like the belt plate opening and closing the discharge hole. A recessed part is formed in a section opposing to the tip of the absorption valve of the valve plate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a valve plate having a cylinder block having a cylinder bore, a piston that reciprocates in the cylinder bore, a suction hole that guides the fluid to be compressed to the cylinder bore, and a discharge hole that guides the fluid to be compressed in the cylinder bore to the outside of the cylinder bore. , A strip plate-like suction valve that opens and closes the suction hole, and a strip plate-like discharge valve that opens and closes the discharge hole, and in addition to the above configuration, one end peripheral wall facing the suction valve of the cylinder bore Further, the present invention relates to a compressor in which a suction valve opening restricting concave portion having a bottom surface with which a suction valve tip abuts when the suction valve is opened is formed.

A valve plate having a cylinder block having a cylinder bore, a piston that reciprocates in the cylinder bore, a suction hole that guides the fluid to be compressed to the cylinder bore, a discharge hole that guides the fluid to be compressed in the cylinder bore to the outside of the cylinder bore, and a suction hole The suction valve tip is in contact with the peripheral wall of the cylinder bore facing the suction valve of the cylinder bore when the suction valve is opened. A compressor in which a suction valve opening restriction recess having a flat bottom surface is formed is disclosed in FIGS.
Japanese Utility Model Publication No. 3-35899

The compressor described in FIGS. 13 to 15 of Patent Document 1 has a problem that the leading end of the suction valve that bends like a whip at the time of opening and closing collides with the bottom surface of the suction valve opening restriction recess and the valve plate and is damaged. is there.
The present invention has been made in view of the above problems. A cylinder block having a cylinder bore, a piston that reciprocates in the cylinder bore, a suction hole that guides the fluid to be compressed to the cylinder bore, and the fluid to be compressed in the cylinder bore to the outside of the cylinder bore. A compressor having a valve plate formed with a discharge hole for guiding, a strip-shaped suction valve for opening and closing the suction hole, and a strip-shaped discharge valve for opening and closing the discharge hole, and further comprising the above-described configuration In addition, the compressor is provided with a suction valve opening restriction recess having a bottom surface with which a suction valve front end abuts when the suction valve is opened, on one peripheral wall of the cylinder bore facing the suction valve. An object is to provide a compressor in which breakage is prevented.

In order to solve the above problems, in the present invention, a cylinder block having a cylinder bore, a piston that reciprocates within the cylinder bore, a suction hole that guides the fluid to be compressed to the cylinder bore, and a fluid to be compressed inside the cylinder bore are guided outside the cylinder bore. A valve plate having a discharge hole, a strip-shaped suction valve that opens and closes the suction hole, and a strip-shaped discharge valve that opens and closes the discharge hole. Provided is a compressor characterized in that a recess is formed.
In the present invention, a cylinder block having a cylinder bore, a piston that reciprocates in the cylinder bore, a suction hole that guides the fluid to be compressed to the cylinder bore, and a discharge hole that guides the fluid to be compressed in the cylinder bore to the outside of the cylinder bore are formed. It is equipped with a valve plate, a strip-shaped suction valve that opens and closes the suction hole, and a strip-shaped discharge valve that opens and closes the discharge hole, and is sucked when the suction valve is opened on one peripheral wall facing the suction valve of the cylinder bore. The compressor is formed with a suction valve opening restriction recess having a bottom surface against which the valve tip comes into contact, and the recess is formed in a portion of the bottom surface of the suction valve opening restriction recess facing the suction valve tip. A compressor is provided.
In the compressor according to the present invention, since the recess is formed in the portion of the valve plate that faces the tip of the suction valve, the tip of the suction valve does not collide with the valve plate when the valve is closed, or the suction valve opening restriction recess. Since the concave portion is formed at a portion of the bottom surface of the bottom surface facing the suction valve tip, the tip of the suction valve does not collide with the bottom surface of the suction valve opening restriction recess when the valve is opened. Therefore, the tip of the suction valve is not damaged. Since the vicinity of the tip of the suction valve is in contact with a portion in the vicinity of the recess on the bottom surface of the suction valve opening restriction recess when the valve is opened, self-excited vibration of the suction valve when the valve is opened is prevented.

In a preferred aspect of the present invention, the chamfered edges of the recesses formed in the valve plate and the recesses formed in the bottom surface of the suction valve opening restriction recess are opposed to the vicinity of the suction valve tip.
By chamfering the edge of the recess formed on the valve plate and the recess formed on the bottom surface of the intake valve opening restricting recess in the vicinity of the suction valve tip vicinity, the vicinity of the suction valve tip contacting the edge when opening and closing Damage to the parts is prevented.

In the compressor according to the present invention, since the recess is formed in the portion of the valve plate that faces the tip of the suction valve, the tip of the suction valve does not collide with the valve plate when the valve is closed, or the suction valve opening restriction recess. Since the concave portion is formed in the portion of the bottom surface facing the suction valve tip, the tip of the suction valve does not collide with the bottom surface of the suction valve opening restriction recess when the valve is opened. Therefore, the tip of the suction valve is not damaged.

  A swash plate compressor according to an embodiment of the present invention will be described.

As shown in FIG. 1, a front housing 2 and a cylinder head 3 are disposed so as to cover both ends of a columnar cylinder block 1. A crank chamber 4 is formed inside the front housing 2, and a plurality of cylinder bores 5 are formed inside the cylinder block 1 at intervals in the circumferential direction. A swash plate 6 is disposed in the crank chamber 4. A drive shaft 7 is inserted through the center of the swash plate 6. The drive shaft 7 is rotatably supported by the front housing 2 and the cylinder block 1 via a bearing (not shown).
A rotor 8 is fixed to the drive shaft 7. The rotor 8 is supported by the front housing 2 via a thrust bearing 9.
The swash plate 6 is connected to the rotor 8 via the link mechanism 10 so as to be capable of varying the tilt angle with respect to the drive shaft 7 and not to rotate relative to the rotor 8 around the drive shaft 7.

  A piston 12 is engaged with the swash plate 6 via a shoe 11. The piston 12 extends in parallel with the drive shaft 7 and is inserted into the cylinder bore 5 so as to be slidable back and forth.

A suction chamber 13 and a discharge chamber 14 are defined inside the cylinder head 3. A suction port 3 a formed in the cylinder head 3 communicates with the suction chamber 13. A discharge port (not shown) formed in the cylinder head 3 communicates with the discharge chamber 14.
A gasket 15 and a valve plate 16 are disposed between the cylinder block 1 and the cylinder head 3. The valve plate 16 is formed with a circular suction hole 16 a that communicates with the cylinder bore 5 and the suction chamber 13, and a circular discharge hole 16 b that communicates with the cylinder bore 5 and the discharge chamber 14.
The valve plate 16 is equipped with a suction valve 17 that opens and closes the suction hole 16a on the side away from the suction chamber 13, and a discharge valve 18 that opens and closes the discharge hole 16b on the discharge chamber 14 side. The suction valve 17 and the discharge valve 18 are configured as strip-type reed valves that open and close the suction hole 16a and the discharge hole 16b by elastically deforming in the out-of-plane direction due to a pressure difference between the inside and the outside.

The valve plate 16 cooperates with the cylinder block 1 to clamp and fix the base portion of the suction valve 17 and allows an out-of-plane deformation of a portion facing the suction hole 16 a of the suction valve 17.
As shown in FIG. 2, a recess 16 c is formed in a portion of the valve plate 16 that faces the tip of the suction valve 17. An edge 16c 'facing the vicinity of the tip of the suction valve 17 of the recess 16c is chamfered in an arc shape.
A suction valve opening restriction recess 5a having a bottom surface 5b with which the tip of the suction valve 17 abuts when the suction valve 17 is opened is formed on one peripheral wall of the cylinder bore 5 facing the suction valve 17. As shown in FIG. 2, a recess 5c is formed in a portion of the bottom surface 5b that faces the tip of the suction valve 17. An edge 5c 'facing the vicinity of the tip of the suction valve 17 of the recess 5c is chamfered in an arc shape.

The operation of the swash plate compressor according to this embodiment will be described below.
The drive shaft 7 is rotationally driven by an external drive source (not shown), and the swash plate 6 rotates as the drive shaft 7 rotates. As the swash plate 6 rotates, the piston 12 reciprocates in the cylinder bore 5. As the piston 12 moves forward, the pressure in the bore 5 decreases, the suction valve 17 moves away from the valve plate 16, and the suction hole 16a opens. As shown by the one-dot chain line in FIG. 2A, the vicinity of the tip of the suction valve 17 bent in a whip shape is the edge 5c 'of the recess 5c formed on the bottom surface 5b of the suction valve opening restriction recess 5a and its edge By contacting the vicinity, the opening of the intake valve 17 is regulated. The tip of the suction valve 17 facing the recess 5c does not reach the bottom surface of the recess 5c and does not collide with the bottom surface of the recess 5c.

Refrigerant gas flowing into the suction chamber 13 from the external refrigeration circuit through the suction port 3 a is sucked into the bore 5 through the suction hole 16 a and is compressed in the bore 5. When the compression of the refrigerant gas is started, the internal pressure of the bore 5 increases, the vicinity of the tip of the suction valve 17 moves away from the bottom surface 5b of the suction valve opening restriction recess 5a, and the suction valve abuts on the valve plate 16 for suction. The hole 16a is closed. As indicated by the alternate long and short dash line in FIG. 2A, when the suction valve 17 contacts the valve plate 16, the vicinity of the tip of the suction valve 17 contacts the edge 16 c ′ of the recess 16 c formed in the valve plate 16. However, the tip of the suction valve 17 facing the recess 16c does not reach the bottom surface of the recess 16c and does not collide with the bottom surface of the recess 16c.
The refrigerant gas pressure in the bore 5 rises, the tip of the part that can be deformed out of plane of the discharge valve 18 is separated from the valve plate 16, and the discharge hole 16b is opened. The pressurized refrigerant gas in the bore 5 is discharged to the discharge chamber 14 through the discharge hole 16b, and flows out from the discharge chamber 14 to the external refrigeration circuit through a discharge port (not shown).

In the swash plate compressor according to the present embodiment, since the recess 16c is formed in a portion of the valve plate 16 that faces the tip of the suction valve 17, the tip of the suction valve 17 does not collide with the valve plate 16 when the valve is closed. Further, since the recess 5c is formed at a portion of the bottom surface 5b of the intake valve opening restriction recess 5b that faces the tip of the valve plate 17, the tip of the intake valve 17 collides with the bottom surface 5b of the intake valve opening restriction recess 5a when the valve is opened. do not do. Accordingly, the tip of the suction valve 17 is not damaged.
Since the vicinity of the tip of the suction valve 17 contacts the edge 5c 'of the recess 5c formed in the suction valve opening restriction recess bottom surface 5b and its vicinity when the valve is opened, the self-excited vibration of the suction valve 17 when the valve is opened. Is prevented.
An edge 16c 'facing the vicinity of the suction valve tip of the recess 16c formed in the valve plate 16, and an edge 5c' facing the suction valve tip vicinity of the recess 5c formed in the suction valve opening restriction recess bottom surface 5b Is chamfered in a circular arc shape, the impact force received by the vicinity of the tip of the intake valve 17 that contacts the edges 5c 'and 16c' during opening and closing is alleviated, and damage to the part is prevented.

In the first embodiment, the edges 5c ′ and 16c ′ of the recesses 5c and 16c may be chamfered in a straight line. Compared with the case where chamfering is not performed at all, the impact force applied to the vicinity of the tip of the suction valve 17 during opening and closing is reduced.

The recesses 5c and 16c may be opposed relatively narrowly to the tip of the suction valve 17 and its vicinity as shown in FIG. 2 (a), or, as shown in FIG. You may face a comparatively wide vicinity.

  The present invention is not limited to a swash plate compressor, a cylinder block having a cylinder bore, a piston that reciprocates in the cylinder bore, a suction hole that guides the fluid to be compressed to the cylinder bore, and a discharge hole that guides the fluid to be compressed in the cylinder bore to the outside of the cylinder bore And can be applied to various compressors including a strip-shaped suction valve that opens and closes the suction hole, and a strip-shaped discharge valve that opens and closes the discharge hole. In addition to the configuration, the present invention can be applied to various compressors in which a suction valve opening restriction recess having a bottom surface with which a suction valve front end abuts when a suction valve is opened is formed on one peripheral wall facing the suction valve of the cylinder bore .

It is sectional drawing of the swash plate type compressor which concerns on 1st Example of this invention. 1 is a structural diagram of a suction valve and neighboring members provided in a swash plate compressor according to a first embodiment of the present invention. (A) is the elements on larger scale of FIG. 1, (b) is a bb arrow directional view of (a), (c) is a cc arrow directional view of (a). It is a figure equivalent to Fig.2 (a) of the swash plate type compressor which concerns on 3rd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Housing 3 Cylinder head 4 Crank chamber 5 Cylinder bore 5a Suction valve opening restriction recessed portion 5b Bottom surface 5c Recessed portion 5c 'Edge 6 Swash plate 12 Piston 13 Suction chamber 14 Discharge chamber 16 Valve plate 16a Suction hole 16b Discharge hole 16c Recess 16c ′ Edge 17 Suction valve 18 Discharge valve

Claims (4)

A valve plate having a cylinder block having a cylinder bore, a piston that reciprocates in the cylinder bore, a suction hole that guides the fluid to be compressed to the cylinder bore, a discharge hole that guides the fluid to be compressed in the cylinder bore to the outside of the cylinder bore, and a suction hole A compressor having a strip-shaped suction valve that opens and closes a discharge plate and a strip-plate-shaped discharge valve that opens and closes a discharge hole, wherein a recess is formed in a portion of the valve plate that faces the tip of the suction valve . A valve plate having a cylinder block having a cylinder bore, a piston that reciprocates in the cylinder bore, a suction hole that guides the fluid to be compressed to the cylinder bore, a discharge hole that guides the fluid to be compressed in the cylinder bore to the outside of the cylinder bore, and a suction hole The suction valve tip is in contact with the peripheral wall of the cylinder bore facing the suction valve of the cylinder bore when the suction valve is opened. A compressor having a suction valve opening restriction recess having a bottom surface, wherein the recess is formed in a portion of the bottom surface of the suction valve opening restriction recess facing the tip of the suction valve. The compressor according to claim 1, wherein an edge of the recess facing the vicinity of the suction valve tip is chamfered. The compressor according to claim 2, wherein an edge of the concave portion formed on the bottom surface facing the vicinity of the suction valve tip end is chamfered.

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