JPH03258979A - Valve device of reciprocal compressor - Google Patents

Abstract

PURPOSE:To ensure the opening and closing movement of a reed valve by providing such a constitution as supporting the reed valve and a spring between a stopper and a discharge valve seat. CONSTITUTION:A stopper 26 is inserted and fixed to the horizontal holes 25 of protruding parts 24 provided on both sides of a valve plate 4 with a discharge valve seat 20 between, and a reed valve 22 and a spring 23 are supported be tween the stopper 26 and the discharge valve seat 20. Hence, a reduction in clearance volume and an improvement in volume efficiency in compression can be enhanced, and opening and closing movement of the read valve 22 can be ensured as no factor is present around the discharge valve seat 20.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a valve device for a relatively small reciprocating compressor used in household refrigerators and the like.

BACKGROUND OF THE INVENTION In recent years, various improvements have been made to valve devices for compressors as compressors become more efficient, but higher efficiency is desired from the standpoint of effective use of energy resources.

An example of a conventional valve device disclosed in Japanese Unexamined Patent Publication No. 178581/1988 will be described below with reference to the drawings. The valve unit 1 has a valve plate 4 having a suction hole 2, a discharge hole 3, and a keeper fixing hole 3a. The housing includes a pair of discharge reed valves 5, 6.7 for opening and closing the discharge hole 3, a stopper 8 for regulating the lift amount of the discharge reed valve 5.6.7, and a stopper 8 for softening the impact during liquid compression. It has a spring 9 and a keeper 10, and a locking pin 11 inserted into the keeper fixing hole 3a of the valve plate 4. A bolt (not shown) is attached to the open end of the cylinder 12 together with the suction reed valve 13, the great gasket 14, the head gasket 16, and the cylinder head 16.
Fixed by Inside the cylinder 12 is a piston 17 that reciprocates by a drive source of a motor (not shown).
have.

In the above configuration, the refrigerant gas is passed through the suction hole 2 of the valve plate 4 by the reciprocating movement of the piston 17, and the refrigerant gas is passed through the cylinder 1 by the opening and closing movement of the suction reed valve 13.
2, is compressed, passes through the discharge hole 3 of the valve plate 4, and is appropriately pressed by the combined spring force of the discharge reed valves 5, 6.7 to create a stable valve. It has characteristics.

Problems to be Solved by the Invention However, with the above configuration, the clearance volume (volume that remains in the cylinder without being compressed and discharged) at the discharge hole 3 increases, and the volume increases due to re-expansion during the suction stroke. It was reducing efficiency. Also, bottle 11
When the valve plate 4 is fixed to the keeper fixing hole 3a, the vicinity of the discharge hole of the valve plate 4 is distorted, resulting in a problem that the sealing performance (normal closing operation) of the discharge reed valves 5, 7, and 7 is deteriorated. Unfortunately, Japanese Patent Application Laid-Open No. 63-30978 proposes a method of reducing the clearance volume by reducing the wall thickness of the valve plate near the discharge hole. The problem was that the strength of the attached parts was weak and easily distorted, and assembly work was also difficult.

In view of the above problems, the present invention is a reciprocating compressor that improves volumetric efficiency by reducing the clearance volume, and that can be easily assembled without deforming the vicinity of the valve plate and the discharge hole. The present invention provides a valve device.

Means for Solving the Problems In order to solve the above problems, the present invention and a valve device for a reciprocating compressor include a valve plate having a recess in which a discharge valve seat is formed on the side opposite to the piston, and The discharge reed valve has a discharge reed valve that opens and closes the hole, a stopper that regulates the lift amount of the discharge reed valve, and a spring that has spring properties that presses down the discharge reed valve, and the discharge valve seat of the valve plate is The stopper is inserted and fixed into a horizontal hole of a convex portion provided on both sides, and the reed valve and the spring are sandwiched between the stopper and the discharge valve seat.

Effects The present invention has the above-described configuration, and the volumetric efficiency in compression can be improved by reducing the clearance volume, and since there is no factor that causes distortion in the vicinity of the discharge valve seat,
The reed valve opens and closes reliably.

EXAMPLE Hereinafter, a valve device according to an example of the present invention will be described with reference to the drawings. Note that the same reference numerals are used for the same configurations as those of the conventional example, and the description thereof will be omitted.

FIG. 1 is an assembled sectional view of a button valve device according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the valve unit and suction reed valve of FIG. 1. There is a discharge valve seat 20 on the outer circumference concentric with the two discharge holes 3 on the opposite side of the valve valve plate 40.
It has a recess 21 having a shape formed therein. In the recess 21 of the valve plate 4, there is fitted a discharge reed valve 22 having two discharge side doors 22&, 22b at each end of a substantially C-shape which come into contact with the discharge valve seat 20, A spring 23 is placed above the spring 23, the middle portion of which contacts the valve plate 4, and the spring 23 having cut and raised portions 23a at both ends. On the other hand, there are protrusions 24 on both sides of the valve plate 4 across the discharge valve seat 20, and a horizontal hole 26 is bored in the protrusions 24 parallel to the valve plate surface. Reference numeral 26 denotes a stopper, which is inserted and fixed into the horizontal hole 26 of the convex portion 24 while pressing the discharge reed valve 22 by the spring 23.

In the above configuration, the recess 2 of the valve plate 4
The discharge valve seat 20 provided in 1 is not subjected to distortion due to the hole inserted near the recess 21 or the insertion of other parts, and the formation of the convex portion 24 ensures sufficient strength. The discharge valve seat 20 is not deformed due to strain, so the discharge reed valve can be opened and closed reliably, and the effect of improving volumetric efficiency due to the reduction in clearance volume due to the formation of the recess 21 can be sufficiently obtained. In addition, the assembly of the valve unit 1 can be completed by dropping the discharge reed valve 22 and the spring 23 into the recess 21 and sliding the stopper 26 from the side into the side hole of the protrusion 24, making assembly very easy and efficient. This makes it possible to provide a good valve device for a reciprocating compressor.

As described above, the valve device for a reciprocating compressor of the present invention has the following effects:
a valve plate having a recess in which a discharge valve seat is formed on the piston side; a discharge reed valve that opens and closes the discharge hole;
a stopper that regulates the lift amount of the discharge reed valve;
The valve plate has a spring having a spring property that presses the discharge reed valve, and the valve plate includes a convex portion provided on one side or both sides of the discharge valve seat, and a horizontal hole bored in the convex portion. By inserting and fixing the stopper in the reed valve, the reed valve and the spring are sandwiched between the stopper and the discharge valve seat, so that volumetric efficiency in compression can be achieved by lowering the clearance volume, and Near the discharge valve seat, there are no press-fitted parts or holes that could cause distortion to the discharge valve seat, so the reed valve opens and closes reliably, reducing the effect of improving volumetric efficiency due to a drop in clearance volume. You can get enough without it. Furthermore, the valve unit can be completed by sliding the stopper into the side hole of the convex portion, making assembly very easy.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a valve device for a reciprocating compressor according to an embodiment of the present invention, Fig. 2 is an exploded perspective view of the valve unit and suction reed valve of the valve device of Fig. 1, and Fig. 3 4 is an assembled sectional view of a conventional valve device, and FIG.
FIG. 2 is an exploded perspective view of the valve unit and suction reed valve shown in the figure. 3...Discharge hole, 4...Valve plate, 12...Cylinder, 1γ...Piston, 20...Discharge valve seat, 21 ...Recess, 22 ...Discharge reed valve, 23 ...Spring, 24 ...Protrusion, 26 ...Side hole, 26. ...stopper

Claims (1)

[Claims] a cylinder, a piston that reciprocates by transmitting a drive source, a valve plate fixed to the cylinder and having a discharge hole and a recess in which a discharge valve seat is formed on the side opposite to the piston, and a valve plate that controls opening and closing of the discharge hole. a discharge reed valve, a stopper for regulating the amount of lift of the discharge reed valve, and a spring having spring properties for pressing the discharge reed valve; A valve device for a reciprocating compressor, characterized in that the stopper is inserted and fixed into a side hole of a provided convex portion, and the reed valve and the spring are sandwiched between the stopper and the discharge valve seat.