JPH03111679A - Valve unit for reciprocating compressor - Google Patents

Abstract

PURPOSE:To obtain a valve unit having a high efficiency which can be assembled automatically easily at a low cost by containing lead in a recess part for lead in a plate and reducing the top volume in a discharge hole. CONSTITUTION:A plate 51 provided in one end surface of a cylinder is provided with a recess part 52 for lead having a discharge hole 2 on the opposite side of the cylinder, and recess parts 54 for holders at both ends of the recess part 52 for lead. Lead 58 is held by a holder 56 fixed by applying both ends of the holder 56 to the recess parts 54 for holders and caulking rivets 57 and the recess part 52 for lead. Because the lead 58 is contained in the recess part 52 for lead, the top volume of the discharge hole 2 is small, and as the re- expansion quantity of high-temperature high-pressure cooling medium compressed by motion of a piston is reduced, the volume efficiency is improved.

Description

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

BACKGROUND OF THE INVENTION In recent years, various improvements have been made to valve devices for reciprocating compressors (hereinafter referred to as valve devices) in order to achieve higher efficiency of the compressor and easier assembly of the valve device.

An example of a conventional valve device as found in Japanese Patent Application Laid-Open No. 178581/1983 will be described below with reference to the drawings.

FIG. 3 is a cross-sectional view of the vicinity of a conventional valve device, FIG. 4 is a front view of the conventional valve device, and FIG. 6 is a cross-sectional view thereof. A plate 1 is disposed on the end face of a cylinder 1o containing a piston 9, and is provided with a discharge hole 2, a pin hole 3 at both ends of the discharge hole 2, and a suction hole 11. A lead 4 is fixed on the opposite side of the cylinder between the plate 1 and the stopper 6 so as to cover the discharge hole 2. θ is a bottle whose one end is press-fitted into the pin hole 3 and protrudes toward the opposite side of the cylinder.
It passes through the lead 4, stopper 6, plate spring 7, and stay 8, and the stay 8 is fixed by caulking the stay 8 to the other end. The plate spring 7 is compressed and inserted between the stay 8 and the stopper 6, and the spring force presses and fixes the plate 7 bar 6 against the grate 11.

In the above configuration, the refrigerant gas sucked into the cylinder 10 through the suction hole 11 by the movement of the piston 9 is compressed by the piston 9, passes through the discharge hole 2, and is rebound by pushing up the reed 4. It is discharged to the cylinder side.

Problems to be Solved by the Invention However, with the above configuration, it is difficult to make the plate thin, so a large amount of high-temperature, high-pressure refrigerant remains in the top volume of the cylinder without being discharged. This refrigerant expands at the same time as the suction stroke begins, which causes a decrease in volumetric efficiency. In addition, there are many parts, and assembly is complicated, such as caulking the stay while keeping the plate spring compressed, making automatic assembly difficult. moreover,
Since the lead is held between the plate and the stopper, the dimensional accuracy of the holding between the end face of the plate and the stopper is difficult, resulting in a structurally expensive component.

In view of the above problems, the present invention provides a valve device that has high efficiency by improving the volumetric efficiency of a compressor, is easy to automatically assemble, and is low in cost.

Means for Solving the Problems In order to solve the second problem, the valve device of the present invention includes an elongated lead recess having a discharge hole on the side opposite to the cylinder, and a lead recess at both ends of the lead recess. a plate provided with a shallow holder recess; an elongated lead that engages with the lead recess and has both ends bent toward the cylinder;
The device includes an elongated plate-shaped holder that holds the lead between the lead recess and is engaged with the holder recess.

According to the above-described structure, the present invention stores the leads in the four lead portions of the plate, so the top volume in the discharge hole can be reduced, and there is little reduction in efficiency due to re-expansion. Since the clamping dimension of the lead is determined by the difference in level between the depth of the recess for the lead and the depth of the recess for the holder, the clamping dimension can be easily obtained when the plate is formed of sintered metal. In addition, it can be assembled without caulking the stay while keeping the plate spring compressed as in the conventional example.

EXAMPLE Hereinafter, a valve device according to an example of the present invention will be described with reference to the drawings.

Note that parts having the same function will be designated by the same reference numerals and a description thereof will be omitted.

FIG. 1 is a front view of a valve device according to an embodiment of the present invention, and FIG.
The figure is a sectional view of a valve device according to an embodiment of the present invention. In the figure, 51 is a plate provided on the end face of the cylinder 1o. The plate 51 is provided with a lead recess 52 having a discharge hole 2 on the side opposite to the cylinder. Also, the lead recess 6
A holder recess 64, which is shallower than the lead recess 52 having the attachment hole 53, is provided at both ends of the lead recess 52. The lead 58 is fixed to the holder 56 by bringing both ends of the holder 6θ, which has through holes 55 at both ends, into contact with the holder recess 54 and caulking a rivet 67 passing through the mounting hole 63 and the through hole 55. It is held between the lead recesses 52.

In the above configuration, as the piston 9 moves, the cylinder 1o is sucked into the suction hole 11 and then compressed.
The high-temperature, high-pressure refrigerant inside passes through the discharge hole 2 and leads to the lead 58.
By pushing up, it is discharged out of the cylinder 10. At this time, the lead 68 is inserted into the lead recess 52 of the plate 51.
Since the top volume of the discharge hole 2 is small, the high temperature and high pressure refrigerant compressed by the movement of the piston 9 has less space to re-expand, thereby improving volumetric efficiency.

Furthermore, the clamping dimensions of the lead 68 are limited due to the structure of the lead recess 6.
2 and the depth of the holder recess 54. Therefore, when the plate 51 is made of a sintered alloy or the like, the clamping dimension of the lead 68 can be easily obtained.

Furthermore, the number of parts is small, and the lead 68 can be connected to the recess 5 for the lead.
The holder 66 can be easily assembled by storing the holder 66 in the four holding common parts 54 of the plate 51 from above stored in the holder 2, and caulking the rivet 57 passing through the mounting hole ε3 of the plate 61 and the through hole 55 of the holder 66. , automatic assembly becomes possible.

Therefore, a compressor with high efficiency due to less re-expansion, easy to obtain component dimensions, and low cost because the number of components is small and automatic assembly is possible can be obtained.

Note that in this embodiment, the holder 56 and the plate 51
Although the rivets 57 are used for fixing, the same effect can be obtained by using other fixing methods such as screwing or press fitting.

Effects of the Invention As described above, the present invention provides a plate having four elongated lead portions having discharge holes on the side opposite to the cylinder, holder recesses shallower than the lead recesses at both ends of the lead four portions, and the lead recess portions. By providing an elongated lead that engages with the lead and has both ends bent toward the cylinder side, and an elongated plate-shaped holder that holds the lead between the lead recess and is engaged with the holder recess. The top volume of the discharge hole is reduced, the lead clamping size can be easily obtained, the number of parts is reduced, and the structure is simple, so automatic assembly is possible.

[Brief explanation of drawings]

Fig. 1 is a front view of a valve device according to an embodiment of the present invention, Fig. 2 is a sectional view of Fig. 1, Fig. 3 is a cross-sectional view of the vicinity of a conventional valve device, and Fig. 4 is a conventional valve device. front view of,
FIG. 6 is a sectional view of FIG. 4. 61...Plate, 62...Recess for lead, 53...Mounting hole, 54...Recess for holder, 66...Through hole , 66... Holder, 67... Rivet, 68... Lead.

Claims (1)

[Claims] This is a valve device disposed on the end face of a cylinder containing a piston, and is fixed to the end face of the cylinder and has an elongated lead recess having a discharge hole on the opposite side of the cylinder, and a recess shallower than the lead recess at both ends of the lead recess. a plate provided with a tool recess, a long and thin lead that engages with the lead recess and has both ends bent toward the cylinder, and the lead is held between the lead recess and engaged with the holder recess. 1. A valve device for a reciprocating compressor, comprising: a slender plate-shaped holder that is fitted together.