JP2550313Y2 - Fluid pressure control device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure control device which is provided between a fluid supply source having a large pressure fluctuation and a fluid consuming section to keep the pressure fluctuation constant.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional apparatus, in which 1 indicates a surge tank, and one end of the tank 1 is connected to a fluid pressure source such as a fuel gas such as LP gas or other raw material gas. The inflow pipe 2 is connected, and the other end is connected to the outflow pipe 3 leading to the consuming equipment. An electromagnetic valve 4 is provided in the inflow pipe 2, and an upper limit setting pressure switch 5 and a lower limit setting pressure switch 6 are provided on the tank 1.

A power supply circuit of the pressure switches 5 and 6 is connected to a power supply 7, and an output circuit of the pressure switches 5 and 6 is connected to a solenoid valve 4. Open and close 4.

That is, when the pressure in the tank 1 reaches the upper limit, a signal from the pressure switch 5 is output to the solenoid valve 4, and the solenoid valve 4 is closed or throttled to stop the supply of gas into the tank 1. The pressure in the tank 1 is reduced.

When the pressure in the tank 1 drops to the lower limit, a signal from the pressure switch 6 is output to the solenoid valve 4,
The fluid is supplied into the tank 1 by opening the solenoid valve 4. Another prior art is disclosed in Japanese Patent Application Laid-Open No. 52-2212.
No. 7 proposes a "pressure regulator for self-acting pressure reducing valve".
You. This is caused by the pressure difference between the primary pressure and the secondary pressure
Continuous change of fluid outflow from the communication hole at the center of the diaphragm
Is controlled continuously.

[0006]

In the case of the above-mentioned conventional apparatus, electric facilities for supplying electric power for operating the solenoid valve 4 and the pressure switches 5 and 6 are required. , It is necessary to make the electrical equipment explosion-proof. For this reason, problems such as an increase in equipment costs occur. Also, the latter pressure regulator is seemingly
It seems that the structure is simple, but changes in the environment such as changes in outside temperature
Causes the control level to fluctuate, and foreign matter enters the mechanism
Operation may not be possible,
It seems that it is difficult.

[0007] An object of the present invention is to provide a fluid pressure adjusting device which maintains a fluid pressure within a certain range without using any electric power in order to solve the above-mentioned problem.

[0008]

In order to solve the above problems BRIEF SUMMARY OF THE INVENTION This invention is communicating or blocking of a fluid pressure source side and the fluid consuming equipment-side at the level of the fluid pressure that is applied to the operating unit
Off valve to, likewise consists of a <br/> Ru way control valve instead disconnect the flow path in the high and low fluid pressure, one of the three-way control valve, the high fluid pressure source side of the opening and closing the set pressure of the on-off valve and the other,
The sensing portion of the lower fluid pressure than the opening set pressure of the on-off valve, the remaining one, connected to the operating portion of the opening and closing valves, the three-way control valve senses the fluid pressure of the sensing portion, the operation of the on-off valve and if the parts and is made conductive only source of fluid pressure by closing the on-off valve, the opening and closing by conducting only the operation unit and the sensing unit
A fluid pressure control apparatus that is replaced Ri switch to and when to open the valve, the three-way control valve, by a spring
A diaphragm chamber in which the biased diaphragm is arranged;
Lower valve body and spring with space for gap formation
And the upper valve body are stacked coaxially, and these three members
The convex part of the lower end of the valve stem that hangs down from the center of the diaphragm
Suspended with play in the vertical direction by the above space
The upper projection of the valve stem is located on the upper part of the upper valve body.
And a three-way switching valve room
is there.

[0009]

According to the present invention, when the fluid pressure of the sensing portion falls below the set pressure of the three-way control valve, the three-way control valve is switched, and the operating portion of the on-off valve operates to open the on-off valve. The opening pressure fluid flows into a chamber or the like on the side of the consuming equipment.

When the fluid pressure of the sensing section becomes higher than the set pressure of the three-way control valve, the three-way control valve is switched, the operation section of the on-off valve operates, and the on-off valve is closed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment shown in FIGS. 1 and 2, reference numeral 11 denotes a chamber, one end of which has an inflow pipe 12 which leads to a fluid pressure source, and the other end of which has an outflow pipe 13 which leads to a consuming facility.
Communication.

An on-off valve 15 having a valve element 10 which is opened and closed by a diaphragm 14 of an operation section 16 is provided in the inflow pipe 12.
And the inflow pipe 12 closer to the fluid pressure source than the valve 15
A three-way control valve 20 operated by the diaphragm 17 is connected to a part of the valve through a communication path 24.

The lower chamber of the diaphragm chamber 21 of the on-off valve 15 communicates with the intermediate portion of the valve chamber 19 of the three-way control valve 20 through a communication passage 22. The upper chamber of the diaphragm chamber 21 communicates with the atmosphere and the diaphragm 14 Is provided.

At the lower end of the valve chamber 19 of the three-way control valve 20, a lower valve port communicating with the communication passage 24 is provided, and a lower valve body 25 for opening and closing the lower valve port is provided at a lower portion inside the valve chamber 19. 2
Reference numeral 6 denotes a valve stem having an upper end connected to the diaphragm 17 and a lower end connected to the lower valve body 25 with a certain range of vertical play.

An upper valve body 27 is mounted at an intermediate portion of the valve rod 26 so as to be movable up and down.
A pressing spring 30 is interposed between the upper and lower portions 7 so that the upper valve body 27 can be pressed down by the protrusion 31 near the upper portion of the valve rod 26.

Reference numeral 32 denotes a diaphragm chamber of the three-way control valve 20, and a communication passage 33 communicating with a lower chamber of the three-way control valve 20 is provided in the chamber 1
1 and is communicated with the pressure sensing unit 34 provided in the unit 1. An upper valve opening which is opened and closed by the upper valve body 27 is provided between the lower chamber of the diaphragm chamber 32 and the valve chamber 19. Further, the upper chamber of the diaphragm chamber 32 is provided with a spring 35 that communicates with the atmosphere and presses down the diaphragm 17.

FIG. 1 shows the case where the pressure in the chamber 11, that is, the pressure sensing unit 34 is lower than the set pressure of the three-way control valve 20 by the spring 35, and the diaphragm 17 of the three-way control valve 20 is lowered by the force of the spring 35, The upper valve body 27 is pushed down by the projection 31 of the rod 26, and the lower chamber of the diaphragm chamber 32 communicates with the valve chamber 19, and the lower valve body 25 closes the lower valve port to shut off the communication passage 24 and the valve chamber 19. I have. Accordingly, the valve chamber 19 has the same pressure as that of the pressure sensor 34, so that the diaphragm 14 of the on-off valve 15 is also pushed down by the spring 23, and the valve body 10 opens the valve port of the on-off valve 15 (the pressure of the pressure sensor 34 is reduced Fifteen
Lower than the pressure set by the spring 23). When the pressure of the pressure sensing unit 34 becomes higher than the set pressure of the three-way control valve 20 due to a decrease in the amount of fluid used in the consuming equipment, the diaphragm 17 moves up as shown in FIG.
Reference numeral 7 first closes the upper valve port, and then the convex portion provided on the valve stem 26
Not created due to the gap between the upper and lower valve bodies 25 and 27
With a time lag , the valve stem 26 lifts the lower valve body 25 and opens the lower valve port, so that the pressure of the fluid pressure source enters the lower chamber of the diaphragm chamber 21, pushes up the diaphragm 14 and raises the valve of the on-off valve 15 with the valve body 10. Close your mouth. Therefore, the supply of the fluid into the chamber 11 stops.

Next, when the pressure of the pressure sensing portion 34 decreases, the diaphragm 17 of the three-way control valve 20 descends, and the lower valve body 25 first closes the lower valve port. Subsequently, the upper valve body 27 opens the upper valve port, the pressure in the lower chamber of the diaphragm chamber 21 decreases, the diaphragm 14 is lowered by the spring 23, the valve element 10 opens the valve port of the on-off valve 15, and the chamber 11 opens.
Supply fluid to

FIG. 3 shows the flow sheet of the first embodiment. In the second embodiment of FIG. 4, a venturi mixer 36 having an air inlet 37 is provided instead of the chamber 11 of the flow sheet, and a pressure is applied to the outflow pipe 13. This embodiment is provided with a sensing unit 34, and the other components are the same as those of the first embodiment shown in FIGS. 1 to 3, and the operation is the same.

FIG. 5 shows two sets of on-off valves 15 and three-way control valves 20, each having a large chamber 11. The outlet of each on-off valve 15 is communicated with the chamber 11, and the chamber 11 is used to supply fluid to consuming equipment. The feed pipe 40 is connected.
The third embodiment also has the same operation as the first embodiment.

[0021]

According to the present invention, as described above, an opening / closing valve for opening and closing a valve for communicating or shutting off a fluid pressure source and a fluid consuming facility according to the level of the fluid pressure applied to the operation unit, and switching the flow path also according to the level of the fluid pressure. A three-way control valve is provided to automatically open and close the on-off valve according to the level of fluid pressure applied to the sensing unit to control the fluid pressure sent to the consuming equipment. Becomes Therefore, it can be used in a dangerous place where a combustible gas is used without providing a special explosion-proof structure, so that the cost required for the equipment can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment when an on-off valve is opened.

FIG. 2 is a cross-sectional view of the first embodiment when the on-off valve is closed.

FIG. 3 is a flow sheet of Example 1.

FIG. 4 is a flow sheet of Example 2.

FIG. 5 is a flow sheet of Example 3.

FIG. 6 is a conventional flow sheet.

[Explanation of symbols]

 15 On-off valve 16 Operation part 19 Valve room 20 Three-way control valve 34 Sensing part

Claims (1)

(57) [Scope of request for utility model registration] 1. A fluid pressure source side and the fluid consuming equipment-side at the level of the fluid pressure that is applied to the operating element and the communicating or blocking causes <br/> off valve, turn off the flow path also in high and low fluid pressure consists of a changing three-way control valve, one of the three-way control valve, the high fluid pressure source side of the opening and closing the set pressure of the on-off valve, the other, the sensing portion of the lower opening and closing the set pressure of the on-off valve fluid pressure, the remaining one, connected to the operating portion of the opening and closing valves, the three-way control valve senses the fluid pressure of the sensing portion, and if allowed to conduct only the operation unit and the fluid pressure source of the on-off valve closes the on-off valve ,
A fluid pressure control apparatus that is replaced Ri switch to the case where by conducting only the operation unit and the sensing unit opens the closing valve, the three-way control valve, which is biased by a spring diamond
The diaphragm chamber in which the
, Lower valve body and spring with upper space
Are stacked coaxially, and these three members are
The space at the lower end of the valve stem that hangs from the center of the
The valve stem is suspended with play in the vertical direction.
The upper projection is located above the upper valve body.
A fluid pressure control device comprising a three-way switching valve chamber .