JPS6244142Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a valve device for a hermetic compressor, and is particularly constructed with a suction valve that opens and closes in response to pressure changes caused by reciprocating movement of a piston. This invention relates to improvements in valve devices.

[Technical background of the invention and its problems]

In a reciprocating type hermetic compressor, a structure is generally adopted as a suction valve device in which a suction valve is located on the outlet side of a suction hole provided at the head of a cylinder chamber. The suction hole that introduces the refrigerant (compressed medium) into the cylinder chamber is opened and closed in response to pressure changes accompanying the reciprocating movement of the piston.

Conventionally, as shown in FIG. 1, this type of valve device includes a suction valve b provided with a stopper portion a at its tip.
The root side of this suction valve b is fixed to the peripheral side of the cylinder chamber c, and the stopper part a is
A structure in which the stopper locks into a stopper locking groove d provided on the circumferential side opposite to the fixed side as shown in FIG. 2, and is installed in the radial direction of the cylinder chamber c via the suction hole e. is used.

By the way, in compressors, it has been pointed out that the contribution rate of suction efficiency to COP, which is also called coefficient of performance and indicates energy efficiency, is significant. That is, the issue is how much refrigerant can be sucked in one cycle.

However, in the structure of the suction valve b described above, the second
As shown in Figures 3 and 3, the refrigerant flowing in from the suction hole e is introduced into the cylinder chamber c through both sides of the suction valve b, which lifts by bending with the fixed side as a fulcrum. There is a problem in that the provided stopper portion a becomes an obstacle, resulting in extremely high flow path resistance and limited suction efficiency.

Therefore, as shown in Fig. 4, the stopper part a
is removed, and suction valve b is oscillated relative to suction hole e using the fixed side as a displacement fulcrum, increasing the lift required to open and close suction valve b, and at the same time reducing flow path resistance and increasing the suction passage. It is conceivable that something could be done to achieve this.

However, although this technology improves suction efficiency, there is a great risk that suction valve b may break, or valve breakage, because the stress associated with opening and closing of suction valve b is concentrated and applied to the displacement fulcrum. There is a need for something that can improve suction efficiency without causing these troubles.

In addition, in FIGS. 2 and 3, g indicates a piston.

[Purpose of invention]

This invention was made in view of the above-mentioned circumstances, and its purpose is to provide a valve device for a hermetic compressor that both prevents valve bending and improves suction efficiency.

[Summary of the idea]

This idea provides a suction valve with an opening/closing part facing the suction hole on the surface of the tip side, and is movably locked to the peripheral side of the cylinder chamber by being located between the tip and the displacement fulcrum on both sides. By using a protruding stopper part on both sides of the stopper part to prevent the valve from bending, the use of an opening/closing part at the tip increases the lift and further reduces flow path resistance. The aim is to achieve suction by increasing the number of suction passages.

[Example of idea]

This invention will be explained below based on an embodiment shown in the drawings. Reference numeral 1 in FIG. 5 indicates a cylinder chamber constituting a compressor section of a hermetic compressor, and a piston 2 is provided within this cylinder chamber 1 so as to be able to reciprocate as shown in FIGS. 6 and 7. Further, a valve plate 4 having a suction hole 3 and a discharge hole (not shown) is installed at the head of the cylinder chamber 1. Furthermore, a suction-side valve device 5 is provided at the head of the cylinder chamber 1, located on the outlet side of the suction hole 3, and a discharge-side valve device (not shown) located on the exit side of the suction hole (not shown). By driving the piston 2 through an electric motor section (not shown), a medium to be compressed such as a refrigerant can be sucked in based on the reciprocating motion of the piston 2, and can be discharged from a discharge valve after a compression stroke. It's becoming like that.

On the other hand, the valve device 5 related to suction, which is the gist of this invention, is constructed as follows.

That is, in the figure, 7 is a suction valve, and this suction valve 7 is made of, for example, an elastic plate-shaped body. The total length of the suction valve 7 is set to, for example, the distance to the center of the cylinder chamber 1, and a fixed portion 8 forming a displacement fulcrum is formed on the root side. In addition, on both sides of the suction valve 7, the suction valve 7
A pair of stopper parts 9, 9 are protrudingly provided between the distal end part of the fixing part 8 and the fixing part 8. These stopper portions 9, 9 are formed, for example, with a sweepback angle relative to the suction valve 7. Further, an opening/closing part 10 is formed on the front end side surface between these stopper parts 9, 9 and the front end of the suction valve 7. In the suction valve 7 configured in this way, the fixing part 8 is inserted and fixed between the valve plate 4 and the cylinder block 1a constituting the cylinder chamber 1,
Each stopper part 9, 9 is movably locked in a stopper locking groove 11, 11, which is a concave groove provided in the opening edge of the cylinder chamber 1, and is installed at the radial center of the cylinder chamber 1. An opening/closing part 10 is arranged approximately in the center of the cylinder chamber 1.
Thus, the suction valve 7 is supported so as to be elastically displaceable using the fixed portion 8 as a fulcrum and also supported by the stopper portions 9, 9 which engage with the circumferential side of the cylinder chamber 1. The suction hole 3 is arranged at a position facing the opening/closing part 10 of the suction valve 7. Therefore, the suction valve 7 can open and close (negative pressure) in response to pressure changes accompanying the reciprocating movement of the piston 2.

Next, the operation of the valve device 5 configured in this way will be explained.

As the piston 2 descends from the top dead center, the inside of the cylinder chamber 1 becomes negative pressure, and following this negative pressure, the opening/closing part 10 of the suction valve 7 moves toward the lumen side of the cylinder chamber 1 using the fixed part 8 as a displacement fulcrum. oscillating displacement to. At this time, since the stopper parts 9, 9 are located at the rear stage of the opening/closing part 10, the opening/closing part 10 is
As shown in the figure, a large lift can be achieved, and since the opening/closing part 10 is located at the tip of the suction valve 7, a suction passage 13 with a large space extending in front of and on both sides of the suction valve 7 is also formed.

Thus, the compressed medium such as refrigerant is introduced into the cylinder chamber 1 from the suction hole 3 through the suction passage with a large lift and reduced flow resistance, and the suction stroke is completed.

Therefore, a large amount of refrigerant can be sucked in one cycle, and the suction efficiency can be improved, and the COP can be improved. Moreover, the suction valve 7 has each stopper part 9,
Since the root side is supported by 9, the suction valve 7
The stress applied to the opening and closing of the suction valve 7 is dispersed to the stopper portions 9, 9 without impairing the suction efficiency of the suction valve 7, and there is no fear that the suction valve will break, that is, so-called valve bending.

Further, this invention is not limited to the above-mentioned embodiment, but may be implemented as another embodiment shown in FIG.

That is, in the embodiment shown in FIG. 8, a bulge 15 is provided at the tip of the suction valve 7, in contrast to the opening/closing portion 10 formed directly on the front surface of the suction valve 7 in the above-described embodiment. Opening/closing part 1 on exit part 15
0, the suction valve 7 of the above embodiment
It is designed to obtain a larger lift than that of the previous model.

[Effect of idea]

As explained above, according to this invention, an opening/closing part for opening and closing the suction hole is formed on the surface of the tip of the suction valve, and a cylinder located between the tip of the suction valve and the displacement fulcrum is formed on both sides of the suction valve. By configuring the suction valve by protruding a pair of stopper parts that movably engage with the peripheral side of the chamber, suction with a large lift, reduced flow path resistance, and enlarged suction passage can be achieved. ,
The suction efficiency can be improved, and at the same time, the stress of the suction valve when opening and closing can be dispersed at the stopper portion without affecting the suction efficiency.

Therefore, it is possible to satisfy both the improvement of COP and the prevention of valve bending.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the structure around the suction valve that constitutes the valve device of a conventional hermetic compressor, and Figs. 2 and 3 show the operating status of the suction valve when viewed from different directions. Fig. 4 is a side sectional view showing a different conventional valve device, Fig. 5 is a side sectional view showing a different conventional valve device.
The figure is a plan view showing a valve device according to an embodiment of this invention.
6 and 7 are side sectional views showing the structure and operation of the suction valve as viewed from different directions, and FIG. 8 is a plan view showing another embodiment of the invention. 1... Cylinder chamber, 2... Piston, 3...
Suction hole, 7... Suction valve, 9... Stopper part.

Claims (1)

[Scope of utility model registration request] A suction hole is provided at the head of the cylinder chamber, and an elastically displaceable suction valve that opens and closes the suction hole is provided on the outlet side of the suction hole, and the suction valve is configured to respond to pressure changes caused by the reciprocating motion of the piston. In a valve device for a hermetic compressor that opens and closes the suction valve, the suction valve is provided with an opening/closing part facing the suction hole on a face part on the tip side, and the cylinder is located between the tip part and the displacement fulcrum on both sides. A valve device for a hermetic compressor, comprising a protruding stopper portion that movably engages with the peripheral side of a chamber.