JP2562505Y2 - Pneumatic controller - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic pressure controller (hereinafter referred to as a regulator) for pressurized air.

[0002]

2. Description of the Related Art Conventionally, in an air micrometer,
It has a regulator that converts the pressurized air supplied from the air source to an output pressure controlled to a precise constant pressure. In this regulator, a pilot pressure proportional to the output pressure is provided, pressure control is automatically performed in comparison with the supply pressure, and the output pressure is always set even if a change occurs on the input / output side.

In such a mechanism, the one shown in FIGS. 2 and 3 is known as a conventional regulator. That is, in FIG. 2, the regulator 31 includes a first constant pressure chamber 33 separated by an intermediate diaphragm 32, a pilot pressure chamber 35 and a second constant pressure chamber 36 separated by an upper diaphragm. The pressurized air flows through the orifice 38 from the bypass passage 37 in the regulator 31 and flows into the pilot pressure chamber 35. Further, the gas flows through the ball valve 39 and flows into the second constant pressure chamber 36. At this time, the opening of the ball valve 39 changes via the upper diaphragm 34 due to the pressing force of the spring 41 compressed by the screw 40 that adjusts to the set pressure, and the air pressure in the pilot pressure chamber 35 changes. The intermediate diaphragm 32 bends due to the air pressure in the pilot pressure chamber 35, the flow control valve 42 in contact with the lower side of the intermediate diaphragm 32 opens, and the supply air flows into the first constant pressure chamber 33 according to the degree of opening.

Accordingly, when the control constant pressure decreases, the air pressure in the second constant pressure chamber 36 decreases, so that the spring 41 expands to push the ball, and the ball valve 39 closes. Along with this,
Pilot pressure increases. At this time, the intermediate diaphragm 32 bends toward the first constant pressure chamber, the relief valve 43 closes, and the flow control valve 42 is pushed down, so that the opening of the flow control valve 42 increases. As a result, the amount of pressurized air flowing into the first constant pressure chamber 33 increases, and the control pressure increases.

When the control constant pressure increases, the air pressure in the second constant pressure chamber 36 increases, so that the upper diaphragm 34 is pushed up against the upper spring 41 and the ball valve 39
Opens. Along with this, the air in the pilot pressure chamber 35 flows out and the pilot pressure drops. For this reason, the intermediate diaphragm 32 bends upward, the relief valve 43 opens to release air, and the flow control valve 42 works in the valve closing direction. As a result, the amount of pressurized air flowing into the first constant pressure chamber 33 decreases, and the control pressure decreases. When the pressure is restored to the set pressure, the pressure balance returns to the equilibrium state. The regulator 31 automatically performs constant pressure control by such a function.

The regulator 51 shown in FIG. 3 has a configuration in which the relief valve portion of the regulator 31 has a fixed throttle structure. That is, the control operation of the air pressure
The function is the same as that of the regulator 31 shown in FIG. 2, but air is released by the structure of a relief throttle 52 having a fixed nozzle instead of a relief valve for air pressure control.

[0007]

However, in such a conventional regulator, the regulator 31 shown in FIG. 2 has a drawback that the structure is complicated even if the air control performance is good. The regulator 51 shown in FIG. 3 has a structure in which the relief throttle 52 has a nozzle in a fixed hole, so that air is constantly discharged. Therefore, the response of the fixed throttle to the fluctuation of the air pressure becomes slow, and the air consumption is wasted. In particular, when there is a large change in the supply pressure, there is a problem that not only the air release corresponding to the change but also the precision of the air control is poor.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an air controller which has a simple structure and can respond precisely to fluctuations in air pressure.

[0009]

According to the present invention, a part of the supplied compressed air is conducted.
A pilot pressure chamber to be inserted and a communication passage with the pilot pressure chamber
Diaphragm that is communicated through
Constant pressure chamber partitioned by the
Ball valve and the diaphragm from the atmospheric pressure side through the diaphragm.
Pressing means for pressing the tool in the direction of closing the communication passage
Having a setting pressure of the pressing means and a pressure of the pilot pressure chamber.
Movement of the ball according to a change in pressure balance with pressure
The opening of the communication passage is changed by the
A part of the output pressure to be increased or decreased to control the output pressure to be constant. <br/> In a pneumatic controller , a center piece is attached to the diaphragm.
And the constant pressure chamber is communicated with the atmosphere to the center piece.
And the diaphragm according to the balance change
Through-hole whose opening changes with the ball valve with the operation of
Is provided .

[0010]

In the above construction, the set pressure of the pressing means and the pressure
The pressure balance with the pressure in the pilot chamber is in equilibrium
When the pressure in the pilot pressure chamber is
When the force rises or falls, the pressure balance is lost and the diaphragm
The system bends to the atmospheric pressure side or the opposite side. Then, the center
The piece moves in the direction that separates from the ball valve.
The opening of the through hole of the center piece increases or decreases. That is, for example
When the supply pressure rises suddenly,
The tar piece operates sensitively and extra pressure is released to the atmosphere through the through hole.
Released during. That is, the diaphragm provided in the diaphragm
The center piece and the ball valve function as a relief valve. I
By appropriately setting the set pressure of the moth pressing means,
Pressurization from through hole to atmosphere when in equilibrium
The amount of released air can be eliminated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In other words, the regulation <br/> Regulator 1, first block 2 and the second block 3 and the third according to the present invention as shown in FIG. 1
Block 4 and the lower die sandwiched between them
The upper die which is the diaphragm 5 and the diaphragm of the present invention
And a diaphragm 6. And inside the regulator 1
The first constant pressure chamber 7 and the pyro
Pressure chamber 8, the second constant pressure chamber 9, which is the constant pressure chamber of the present invention, atmosphere
Each of the pressure chambers 10 is formed.

The first block 3 is supplied with pressurized air.
Port 11 and an air microphone meter (not shown) are connected.
An outlet 12 is provided. Supply port 11 is a communication passage
13 communicates with the first constant pressure chamber 7 via the communication passage 1.
3 is fixed to the lower diaphragm 5 and communicates with it.
A flow control valve 14 for opening and closing the passage 13 is loosely inserted. under
Diaphragm 5 is fixed by a fixed spring 15 in the first constant pressure chamber 7.
Therefore, it is pressed toward the pilot pressure chamber 8. Furthermore, the flow
The pressing force of the amount control valve 13 can be adjusted by the adjusting screw 16.
Pressed toward the pilot pressure chamber 8 by the first adjustment spring 17
And the communication passage 13 is closed. Also, the first block
From the hook 2 to the second block 3, the supply port 11
Branch and pressurized air 1 through orifice 18
Part bypass inlet passage 19 for supplying the pilot pressure chamber 8
Is provided.

The second constant-pressure chamber 9 is provided with a communication passage 20.
Through the pilot pressure chamber 8 through the
It is in communication with the supply port 11 through the Ipas outlet channel 21.
You. In the second constant pressure chamber 9, the opening of the communication passage 20 is increased or decreased.
The ball valve 22 is housed. On the other hand, the second constant pressure chamber 9
At the center of the upper diaphragm 6 to be formed,
A center piece 23 is provided facing the passage 20,
The center piece 23 has a second constant pressure chamber 9 and the atmospheric pressure chamber 10.
And a through hole 24 that communicates with.

On the other hand, the atmospheric pressure chamber 10 is connected through a small hole 25.
Is in communication with the atmosphere. In the atmospheric pressure chamber 10, the above
Of diaphragm 6 and center piece 23 of pilot pressure chamber
The second adjustment spring 26 that presses the second adjustment spring 8 is accommodated. this
The pressing force of the second adjusting spring 26 is screwed onto the third block 4.
It can be adjusted by adjusting screw 27
Therefore, in the state shown in FIG.
The center piece 23 comes into contact with the ball valve 22 by the pressing force,
Thereby, the through hole 24 and the communication passage 20 are closed.
I have.

In this configuration, the pressurized air supplied for measurement from the supply port 11 branches in two directions, one is supplied in the direction of the first constant pressure chamber 7, and the other is supplied to the bypass inflow path.
The pressure is supplied to the pilot pressure chamber 8 through the orifice 18. Further, it flows through the communication passage 20 and flows into the second constant pressure chamber 9.

At this time, the second adjusting screw for adjusting to the set pressure
When deflect the second adjustment spring 26 to tighten the 27, ball by the center piece 23 which is interposed diaphragm 6 above -
The valve 22 is pushed, and the communication path 20 is closed. Accordingly, the amount of air flowing through the communication passage 20 decreases, so that the air pressure in the pilot pressure chamber 8 increases. Due to this air pressure, the lower diaphragm 5 bends downward (toward the first constant pressure chamber), and the flow control valve 14 is pushed down. The air flowing through the flow control valve 14 flows out of the outlet 12 through the first constant pressure chamber 7. On the other hand, this air
The air flows out of the constant-pressure chamber 9 while being joined with the air flowing through the bypass outflow passage 21.

At this time, the opening of the flow control valve 14 depends on the air pressure of the pilot pressure chamber 8 and the lower diaphragm 5.
Is proportional to the pressing force due to the pressure receiving area. Here, " the opposing force of the product of the air pressure of the second constant pressure chamber 9 and the pressure receiving area of the upper diaphragm 6 " is balanced with the "pressing force of the second adjusting spring 26 by the second adjusting screw 27 " to be in an equilibrium state. At one time, the opening of the communication passage 20 is constant. Moreover, since the air pressure in the pilot pressure chamber 8 is also constant, the opening of the depressed flow control valve 14 is also constant. Therefore, the amount of pressurized air flowing into the first constant pressure chamber 7 becomes constant,
The control pressure will maintain a constant state. Further, the amount of pressurized air flowing into the second constant pressure chamber 9 also has the same control pressure.

When the supply pressure fluctuates, this equilibrium state is broken. Here, when a high supply pressure from the supply port 11, the flow since the orifice 18 is well very small, the air pressure in the pilot pressure chamber 8 is not changed without react immediately, the flow control valve 14 The increased air inflow increases the air pressure in the first constant-pressure chamber 7. Therefore, since the lower diaphragm 5 is pushed up (in the direction of the pilot pressure chamber), the opening of the flow control valve 14 is reduced. Further, the air pressure of the second pressure chamber 9 similarly to the air pressure in the first pressure chamber 7 is also higher, anti the pressing force of the second adjusting spring 26 diaphragm 6 above by second adjustment screws 27 <br/> And is pushed upward (in the direction of the atmospheric pressure chamber). At this time, the center piece 23 is separated from the ball valve 22 , and a through hole penetrating through the center of the center piece 23.
Air flows into the atmospheric pressure chamber 10 from 24 and is released into the atmosphere through the small holes 25 . Therefore, when the air pressure in the first constant pressure chamber 7 and the second constant pressure chamber 9 decreases to a predetermined constant pressure,
An equilibrium state at the time of setting is obtained by balancing with the pressing force of the second adjustment spring 26 by the second adjustment screw 27 . That is, the supply pressure is high
When it becomes too old, the ball valve 22 and the center piece 23
Functions as a relief valve.

The control air outlet 12 is connected to the control air outlet 12.
When the air consumption of an air micrometer or the like (not shown) suddenly increases, the air pressure in the first constant pressure chamber 7 and the second constant pressure chamber 9 decreases. When the air pressure in the second constant pressure chamber 9 decreases, the above-mentioned equilibrium state is broken and the second adjusting screw 2
By extension of the second adjusting spring 26 by 7, the diaphragm 6 of the upper is pressed (direction of the second pressure chamber). As a result, the center piece 23 pushes the ball valve 22 in contact with the center piece 23 to close the central through hole 24 , and the opening degree of the communication passage 20 decreases. For this reason, the air pressure in the pilot pressure chamber 8 rises, the lower diaphragm is pushed down (in the direction of the first constant pressure chamber), and the flow control valve 14 in contact therewith also goes down, increasing the opening. Therefore, the amount of air flowing into the first constant pressure chamber 7 increases, and the air pressure rises. Therefore, when the second constant pressure chamber 9 is also restored to the predetermined constant pressure, the pressure balance returns to the equilibrium state at the time of setting.

That is, in the regulator 1 of this embodiment,
The fluctuation of air pressure between the ball valve 22 and the center piece 23
By operating sensitively to the
The output pressure is more precisely controlled than that with
can do. Moreover, the configuration is shown in FIG.
It is extremely simple compared to the conventional one. In addition, the flat
In equilibrium, waste of pressurized air into the atmosphere
It is economical.

[0021]

[Effect of the Invention] As described above, in the present invention,
Diaphragm that contacts the atmospheric pressure and divides the constant-pressure chamber
A center piece is provided on the
Sensitive operation, relief with ball valve
Function as a valve. Therefore, large pressure fluctuation
Control the output pressure precisely.
Can be. Moreover, its structure is simple and pneumatically controlled.
The cost and size of the controller can be reduced. Ma
When the air pressure is in equilibrium with no fluctuation,
Eliminates the amount of compressed air released into the atmosphere through holes
Economical without waste of compressed air
It is. The present invention can be applied to other gases (nitrogen or hydrogen).

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a pneumatic controller according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing an example of a conventional air pressure controller.

FIG. 3 is a longitudinal sectional view showing an example of an air pressure controller in another conventional example.

[Explanation of symbols]

Reference Signs List 1 Air pressure controller (regulator) 5 Diaphragm below diaphragm 6 (diaphragm) 7 First constant pressure chamber 8 Pilot pressure chamber 9 Second constant pressure chamber (constant pressure chamber) 10 Atmospheric pressure chamber 11 Supply port 12 Outlet 14 Flow control valve 18 orifice 20 communication passage 22 ball valve 23 center piece 26 second adjusting spring (pressing means)

Claims (1)

(57) [Scope of request for utility model registration] 1. A part of the supplied compressed air is introduced.
Via a pilot pressure chamber and a communication passage with the pilot pressure chamber
By the diaphragm which is connected and is in contact with the atmospheric pressure
Partitioned constant pressure chamber, and ball valve provided in the constant pressure chamber
And the ball from the atmospheric pressure side via the diaphragm
Pressing means for pressing in a direction to close the communication path.
And the set pressure of the pressing means and the pressure of the pilot pressure chamber.
The movement of the ball according to the change of the pressure balance
Change the opening of the communication passage and take it out of the constant pressure chamber
In a pneumatic controller for increasing or decreasing a part of the output pressure and controlling the output pressure to be constant, a center piece is provided on the diaphragm;
In addition, while communicating the constant pressure chamber with the atmosphere,
Movement of the diaphragm according to the change in
A pneumatic controller characterized by having a through-hole whose opening changes with a valve .