JPS6144043Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a non-lubricated compressor valve used when pressurizing air, steam, etc.

For example, in this type of compressor 1, both ends of a cylindrical cylinder 2 are connected to a valve seat 3 as shown in FIG.
A piston 4 is provided inside to slide back and forth.

This piston 4 has a pair of piston heads 5, 5.
are connected by rod 6, and this rod 6
A crankshaft 8 is connected to the engine through a bushing 7.

The valve seat 3 has a plurality of suction ports 9 and a plurality of discharge ports 10, each of which has a suction passage 12 formed in the cylinder cover 11.
The valve seat 3 is provided with plate valves 14 and 15 that cover the suction port 9 or the discharge port 10. As shown in FIG. 2, the plate valves 14 and 15 are fixed to the valve seat 3 together with valve stoppers 18 and 19 by bolts 16 and nuts 17. Each of the suction ports 9 is covered.

Here, these plate valves 14 or 15 are arranged so as to cover six ports as shown in FIG.
Although it has two valve pieces 14a or 15a,
Each of these valve pieces 14a or 15a only covered each port 9 or 10 with its flat surface, and could not completely seal this port.

That is, in the above-mentioned non-lubricated compressor, no lubricating oil is present on the surface of the valve seat 3, and the valve seat 3 and the plate valves 14, 15 are in metal-to-metal contact with each other. If lubricating oil exists between the two metals at the time of this contact, this oil will enter the small gap and improve the sealing performance between the valve seat 3 and the plate valve 14 or 15. In the case of contact, if there is even a slight unevenness in the contact area between the two, leakage will occur from the gap created there.

The present invention was developed with attention to the above-mentioned problems, and the purpose is to provide a valve structure that does not cause leakage due to the shape of the contact part even when metals come into contact with each other. In a compressor valve equipped with a plate valve that opens and closes one or more circular ports opened in a valve seat, a valve with a diameter larger than the diameter of the circular port is placed at the circular port closing position of the plate valve. The point is that a spherical bulge is formed that bulges inward of the circular port.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a sectional view showing the main parts of the valve structure according to the present invention, and the same members as those shown in FIG. 2 are given the same reference numerals.

This valve structure has bolts 16 to valve seat 3.
and plate valves 20, 2 using nuts 17.
It is similar to the one shown in FIG.
a, 21a (see Figure 5) with circular port 9 or 1.
Spherical bulging portions 20b and 21b bulging toward the 0 side
is formed. Note that both plate valves 20, 2
1 have similar shapes, only the plate valve 20 is shown in FIG. 5, and the plate valve 21 is given the reference numeral in this document.

The spherical bulges 20b and 21b may be formed at the same time when the plate valves 20 and 21 are pressure-formed using a press, but in some cases, hemispherical balls may be fixed by brazing or other means. You may.

However, in this case, the size D of the spherical bulges 20b and 21b must be larger than the diameter d of the circular port 9 or 10 opened in the valve seat 3.

That is, according to the plate valves 20 and 21 formed in this way, no matter how the valve is brought into contact with the circular port 9 or 10, the spherical bulge 20
b, 21b come into contact with the mouth edge of the circular port 9 or 10 and will definitely close the circular port 9 or 10, so that unnecessary gas etc. will not flow through this circular port 9 or 10.

Next, the action will be explained.

When the piston 4 moves to the left from the state shown in FIG. 1, compressed gas flows into the cylinder 2 through the suction side passage 12 and the port 9 against the elastic force of the plate valve 20.

In this case, the spherical bulging portion 21b of the plate valve 21 contacts the mouth edge of the discharge port 10 over the entire circumference of the discharge port 10, so that the gas is not allowed to flow in from the port 10. do not have.

After the piston 4 moves to the left by a predetermined amount, when it starts moving to the right in order to compress the compressed gas in the cylinder 2, the spherical bulge 20b of the plate valve 20 completely blocks the suction port 9. However, the plate valve 21 that was blocking the discharge port 10
opens, and the compressed gas is discharged from the discharge side port 10 and passage 13.

Closing of the suction port 9 in the plate valve 20 in this case is the same as in the case of the plate valve 21 during suction described above.

As is clear from the above description, according to the present invention, in a compressor valve equipped with a plate valve that opens and closes one or more circular ports opened in a valve seat, the circular port closing position of the plate valve is provided. In addition, since a spherical bulge having a diameter larger than the diameter of the circular port and bulging inward of the circular port is formed, the sealing performance of the circular port is improved even in the absence of lubricating oil. become,
Moreover, by molding the spherical bulge at the same time when press molding this plate valve, the above-mentioned improvement in sealing performance can be achieved without requiring any separate parts, and the excellent effect of not increasing the number of parts can be achieved. .

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of a conventional compressor, Figure 2
The figure is an enlarged sectional view of the main part of Fig. 1, Fig. 3 is a front view of the plate valve of Fig. 1, Fig. 4 is an enlarged sectional view of the main part of the present invention, and Fig. 5 is a front view of the same plate valve. It is. 2...Cylinder,...Valve seat, 4...Piston, 9...Suction port, 10...Discharge port, 20...Plate valve, 21a, 21a...
...Valve piece, 20b, 21b...spherical bulge.

Claims (1)

[Scope of utility model registration request] In a compressor valve equipped with a plate valve that opens and closes one or more circular ports opened in a valve seat, a valve with a diameter larger than the diameter of the circular port is placed at the circular port closing position of the plate valve. The structure of a compressor valve has a spherical bulge that bulges inward.