JPS6117456Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a diaphragm-type pressure governor in which an orifice is provided in the seat on the high pressure side to reduce the impact of the diaphragm valve coming into contact with the seat on the low pressure side. .

A pressure governor is installed, for example, in an air piping system, between an air tank and an air compressor, and is used to automatically adjust the pressure within the air tank within a certain range by operating the unloader valve of the air compressor. An example of a conventional diaphragm type is shown in FIG.

In FIG. 1, a governor body 1 is formed with an inlet 2 on the high pressure side and an outlet 3 on the unloader side, and a diaphragm valve 4 is disposed between the inlet 2 and the outlet 3. This diaphragm valve 4 is pressed by a spring 5 provided on the low pressure side, so that the high pressure side retainer 4a of the valve 4 is seated on the high pressure side seat portion 6 provided at the inlet 2, and the high pressure side and the unloader side are connected. It's blocking communication. When the pressure on the high pressure side approaches the upper limit of the set range, the diaphragm valve 4 is pushed open against the pressing force of the spring 5, releasing the pressure on the high pressure side to the unloader side. At the same time, the low pressure side retainer 4b of the diaphragm valve 4 is connected to the main body 1 on the low pressure side.
It is seated on a low-pressure side seat part 7 fixed to a sleeve 8 screwed into the valve, thereby blocking communication between the unloader side and the atmosphere side, and allowing pressure on the high-pressure side to act on the unloader valve.

However, in the conventional diaphragm type pressure governor configured as described above, the pressure receiving area of the high pressure side retainer 4a of the diaphragm valve 4 that receives the pressure on the high pressure side is large, so the pressure on the high pressure side may suddenly increase. In this case, diaphragm valve 4
The low-pressure side retainer 4b abuts against the low-pressure side seat portion 7 with a large impact force. Low pressure side seat part 7
The seat portion 7 is made of a soft material such as rubber to improve adhesion, and the low pressure side retainer 4 is
Since b is made of a hard metal, it is severely worn out by the impactful contact of the low-pressure side retainer 4b. When the low pressure side seat part 7 is worn out in this way,
The preset stroke of the diaphragm valve 4 changes, and the operating pressure of the diaphragm valve 4 becomes unstable. To deal with this, diaphragm valve 4
The stroke of the valve opening pressure is adjusted by the rotation of the sleeve 8, and since the pressing force of the spring 5 changes depending on the rotation of the sleeve 8, it must be adjusted by rotating the valve opening pressure adjustment bolt 9 screwed into the sleeve 8. First, it has the disadvantage that such troublesome adjustment work must be performed frequently.

In addition, if the low pressure side seat part 6 is damaged so that a part of it is chipped due to impactful contact with the low pressure side retainer 4b, the pressure on the unloader side leaks to the atmosphere from the damaged part and no longer exists. If the sleeve 8 becomes unusable, the low-pressure side seat portion 7 is fixed to the sleeve 8, so the entire sleeve 8 must be replaced, resulting in a disadvantage that the time for replacement becomes extremely early.

Therefore, in this invention, in order to eliminate the above-mentioned drawbacks, an orifice is provided in the high-pressure side seat part to reduce the impact of the diaphragm valve coming into contact with the low-pressure side seat part. The purpose of this invention is to provide a diaphragm type pressure governor that has a stable operating pressure over a long period of time and is highly durable.

Examples of this invention will be described below with reference to the drawings. In FIG. 2, the diaphragm type pressure governor of this invention is shown, and the governor body 1 is as follows:
A high-pressure side main body 1a and a low-pressure side main body 1b are solidly mounted, and each main body 1a, 1b has an inlet 2 on the high-pressure side and an outlet 3 on the unloader side formed at right angles to each other. .

The diaphragm valve 4 is configured such that its central portion is sandwiched between a high pressure side retainer 4a and a low pressure side retainer 4b, and the periphery of the diaphragm valve 4 is a high pressure side main body 1a.
The high-pressure side main body 1a and the low-pressure side main body 1b divide the space into a high-pressure side chamber 10a and a low-pressure side chamber 10b. A high-pressure side retainer 4a of this diaphragm valve 4 is pressed by a spring 5 provided on the low-pressure side and is seated on the high-pressure side 6.

The spring 5 is housed in a spring chamber 11 formed in a sleeve 8 screwed into the low-pressure side main body 1b in line with the high-pressure side inlet 2, and slides between the low-pressure side retainer 4b of the diaphragm valve 4 and the spring chamber 11. It is interposed between a guide 12 inserted into the sleeve 8 so as to be movable. A valve opening pressure adjusting bolt 9 screwed onto the sleeve 8 on the side opposite to the spring of this guide 12
is in contact with. Therefore, by rotating the bolt 9, the guide 12 is moved, and the pressing force of the spring 5 on the diaphragm valve 4 is changed.
The opening pressure of the diaphragm valve 4 can be adjusted. Note that 13 is a nut for fixing the sleeve 8, 14 is a nut for fixing the bolt 9, and 15 is a protective cap provided around the bolt 9.

The chambers 10a, 10 separated by the diaphragm valve 4
b, the high pressure side chamber 10a is the high pressure side main body 1a.
and the low-pressure side main body 1b are communicated with the outlet 3 on the unloader side via small diameter passages 16a and 16b formed in each of the low-pressure side main body 1b. On the other hand, the low-pressure side chamber 10b is connected to the outlet 3 on the unloader side via a passage 17 formed in the low-pressure side main body 1b, as well as a hole 18 formed in the spring chamber 11 and the guide 12, and a hole 18 formed in the sleeve 8. It is communicated with the atmosphere side through a hole 19 .

The high pressure side seat part 6 is fixed to the high pressure side main body 1a between the high pressure side inlet 2 and the high pressure side chamber 10a,
A high pressure side retainer 4a of the diaphragm valve 4 is seated on this high pressure side seat portion 6. The high pressure side seat part 6 has an orifice 20 between the inlet 2 and the chamber 1.
It is formed so as to communicate with 0a. Therefore, the compressed air on the high pressure side flows through this orifice 20.
Since the pressure is narrowed by passing through the chamber 10a, even if the pressure on the high pressure side increases rapidly, the pressure in the chamber 10a will not increase as rapidly as compared to that, but will increase at a gentle speed.

Note that 21 is a filter provided at the high-pressure side inlet, and this filter 21 is fixed to the high-pressure side main body 1a by a snap ring 22.

The low pressure side seat part 7 is made of a soft material such as rubber, and is provided so that the low pressure side retainer 4b of the diaphragm valve 4 is seated at the opening of the spring chamber 11 of the sleeve 8.

In the above configuration, when the pressure on the high pressure side approaches the upper limit of the setting range, the high pressure side retainer 4a of the diaphragm valve 4 is pressed, the diaphragm valve 4 is pushed open against the pressing force of the spring 5, and the high pressure side is opened from the gap. The pressure flows into the high-pressure side chamber 10a, increases the pressure in the chamber 10a, moves the diaphragm valve 4 against the spring 5, and the low-pressure side retainer 4b of the valve 4 is seated on the low-pressure side seat 7. At this time, the high pressure side chamber 10a
Since the pressure fluctuations within the diaphragm valve 4 are restricted by the orifice 20, they do not increase rapidly and the rate of increase is slow, so the seating operation speed of the diaphragm valve 4 is also moderated in comparison.

Therefore, the seating impact is alleviated, and wear and tear on the seat portion 7 is reduced, extending its life.

The compressed air in the chamber 10a on the high pressure side is connected to the passage 16a,
16b to the outlet 3 on the unloader side, and since the low pressure side of the diaphragm valve 4 is closed, it is sent to the suction side of the air compressor, actuating the unloader valve and putting the air compressor in a decompressing state.

In the above state, when the pressure on the high pressure side is consumed by other equipment and approaches the lower limit of the setting range, the pressing force of the spring 5 overcomes it and the low pressure side retainer 4b of the diaphragm valve 4 separates from the low pressure side seat part 7. Then, the high pressure side retainer 4a is seated on the high pressure side seat portion 6, and the high pressure side of the diaphragm valve 4 is closed. Then, the pressure in the outlet 3 on the unloader side and the chamber 10b on the low pressure side is released to the atmosphere through the holes 18 and 19. As a result, the unloader valve returns to its original position and the air compressor begins to compress.

As described above, according to this invention, in the diaphragm type pressure governor, an orifice is provided in the high pressure side seat part to reduce the impact of the diaphragm valve contacting the low pressure side seat part, so that the low pressure side The life of the seat portion is extended, so that the operating pressure can be kept stable for a long period of time, and it is possible to provide a diaphragm type pressure governor that can be used as is for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional diaphragm type pressure governor, and FIG. 2 is a sectional view showing a diaphragm type pressure governor of this invention. 2...High pressure side inlet, 3...Unloader side outlet, 4...Diaphragm valve, 6...High pressure side seat section, 7...Low pressure side seat section, 20...Orifice.

Claims (1)

[Scope of utility model registration request] A diaphragm valve 4 is disposed between the high pressure side inlet 2 and the unloader side outlet 3, and the diaphragm valve 4 is connected to the high pressure side main body 1 formed by the high pressure side inlet 2.
The high pressure side seat part 6 is pressed by a spring 5 and is seated on the high pressure side seat part 6 fixed to a, and the high pressure side seat part 6 has a large diameter hole on its diaphragm side, and a high pressure side inlet 2 connected to the large diameter hole. Orifice 2 that communicates with
A diaphragm type pressure governor characterized by having a zero.