JPS5911234Y2 - compressor discharge valve - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement in the discharge valve of a compressor.

FIG. 1 is an explanatory view showing the discharge valve portion of a conventional compressor used in refrigerators, etc., where FIG.

In the figure, 1 is a compression chamber that compresses a refrigerant gas medium, 2 is a cylinder that forms a part of the chamber wall of the compression chamber 1, and 3 is a cylinder that covers the side of the cylinder 2 and forms the other part of the chamber wall. A certain valve plate 4 is a discharge valve provided on the valve plate 3, a discharge port 5 is a circular hole passing through the valve plate 3, and one end is overlapped to form a fixed part A.
The shape is formed by an elastic plate 6, a plate spring 7, a stopper 8, which are three vertically elongated plate-like bodies fixed to the valve plate 3, a plate spring 7, a stopper 8, and a gas groove 9 provided at the periphery of the discharge port 5. being intimidated.

In addition, the free end of the elastic plate 6 closes the discharge port 5 from the outside,
It is shaped so as to also cover the gas groove 9.

The free end of the leaf spring 7 is curved outward, and its tip is shaped into a semicircular shape so as to press the tip of the elastic plate 6 along the semicircular periphery of the discharge port 5. has been done.

Further, the stopper 8 is located outside the leaf spring 7 and restricts the outward movement of the elastic plate 6.

Next, the operation of the discharge valve 4 will be explained with reference to Figures 1-2 and 2.

The same reference numerals in each figure indicate the same parts. The figure shows a state in which the gas in compression chamber 1 is still hardly compressed.
The elastic plate 6 closes the discharge port 5 by the action of a leaf spring 7.

However, when the gas pressure inside the compression chamber 1 gradually rises and exceeds the value of (the pressing force of the leaf spring 7) + (the gas pressure outside the compression chamber 1), the discharge port 5 is opened as shown in Figure 8, and the gas The body is discharged out of the compression chamber 1 as indicated by the white arrow.

The gas is about to be discharged until the pressure inside and outside the compression chamber 1 is balanced, but before that, the restoring force of the elastic plate 6 and the leaf spring 7 moves in the direction of closing the discharge port 5, so that the gas is discharged as shown in Figure 2. After passing through the state, it returns to the state of the drawing.

At this time, a considerably high-pressure gas body is stored in the gas groove 9, so even if something like lubricating oil adheres between the outer surface of the valve plate 3 and the elastic plate 6, the elastic plate 6 will close the discharge port 5. It does not interfere with opening.

The compressor sends the compressed gas to the outside while repeating the above cycle, but in the conventional compressor, the leaf spring 7
Since the tip of the elastic plate 6 presses the tip of the elastic plate 6 along the semicircular circumference of the discharge port 5, the discharge port 5 is not completely closed by the elastic plate 6, and the gas body flows into the compression chamber 1 when the discharge port 5 is closed. This had the disadvantage that it could leak to the outside or flow backwards, reducing the capacity of the compressor.

FIG. 2 is a diagram showing the most obvious case. When the gas pressure in the compression chamber 1 rises and the elastic plate 6 opens the discharge port 5, the elastic plate 6 is pushed out by the gas pressure as shown in the figure. As a result, a portion of the edge of the elastic plate 6 appears to be caught in the gas groove 9, and a considerable amount of gas leaks from this portion.

This invention aims to improve the above-mentioned drawbacks.

FIG. 3 is a view similar to FIG. 1 showing an embodiment of this invention, and the same reference numerals indicate the same parts as in the previous figure.

Most of the structure and shape of the figure are the same as those in FIG. The only difference is that the elastic plate 6 is configured to be pressed over the entire width of the elastic plate 6, including the transverse diameter passing through the center point of the outer surface of the portion facing the elastic plate 5.

With this structure, even if the gas pressure increases, there is no concern that the elastic plate 6 will be deformed as shown in FIG. There is almost no gas leakage or backflow that occurs with conventional products, and it is possible to greatly improve the reduction in compressor capacity.

FIG. 4 shows a different embodiment, in which the leaf spring 7 has two protrusions 7b1 and 7b2 by shaping the cross section of the leaf spring 7 into an S-shape, and a protrusion 7b'' on the tip side. As in FIG. 3, the pressure is applied to the lateral diameter passing through the center point of the outer surface of the portion of the elastic plate 6 facing the discharge port 5.

FIG. 5 shows a further different embodiment, in which Figure A is a plan view and Figure 5 is a sectional view of the lower end thereof.

In this case, the cylindrical or cylindrical projection 7C provided at the free end of the leaf spring 7 presses the center of the outer surface of the elastic plate 6 facing the discharge port 5. In this case, the pressing force exerted on the closing peripheral edge of the discharge port 5 of the elastic plate 6 is equalized, so that a better effect can be obtained.

In all of the above embodiments, a portion of the outer surface of the elastic plate 6 on the center line of the discharge port 5 is pressed.
Even if the position is slightly shifted, as long as the area is pressed, a very noticeable effect can be obtained compared to conventional products.

Further, in all of the above embodiments, the leaf spring 7 was used to press the elastic plate 6, but it goes without saying that the same effect can be obtained with other spring bodies.

As explained above, this device uses a spring body to press the vicinity of the center of the outer surface of the elastic plate that closes the outlet, which faces the outlet, to almost eliminate gas leakage and backflow when the outlet is closed. This has the effect of greatly improving the decline in performance.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams explaining the operation of the discharge valve of a conventional compressor, Figure 3 is a plan view and a sectional view showing one embodiment of this invention, and Figure 4 is a different implementation. A cross-sectional view showing an example, and FIG. 5A is a plan view and a cross-sectional view showing a further different embodiment. In the figure, 1 is a compression chamber, 3 is a chamber wall, 4 is a discharge valve, 5 is a discharge port, 6 is an elastic plate, and 7 is a spring body. The same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A discharge port provided in the chamber wall to discharge the medium compressed inside the compression chamber to the outside of the chamber, an elastic plate attached such that the free end closes the discharge port from the outside, and this elastic plate. A discharge valve for a compressor equipped with a spring body configured to press near the center of an outer surface of a plate facing a discharge port.