JP4175438B2 - Pressure control valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure control valve. For example, it is applied to a pressure control valve used for a railway vehicle.
[0002]
[Prior art]
A conventional pressure control valve is shown in FIG. This pressure control valve is composed of a relay valve portion 1, a supply solenoid valve 2, a pressure reducing solenoid valve 3, and a pressure sensor 4. In order to set the secondary side pressure of the relay valve portion 1 to a predetermined pressure, a supply valve The solenoid valve 2 and the pressure reducing solenoid valve 3 are operated as follows.
[0003]
(1) When the secondary pressure is increased When the supply solenoid valve 2 is operated to supply compressed air to the A chamber of the relay valve section 1 and the pressure in the A chamber is increased, the supply / discharge valve rod 6 is raised. Power to try to work. This force can be calculated by the pressure receiving area of the membrane plate x the pressure in the A chamber.
When this force becomes larger than the pressing force of the spring 8, the supply / discharge valve rod 6 rises. When the ascent continues, the valve 7 opens and the primary compressed air is introduced to the secondary side.
[0004]
Further, the compressed air introduced to the secondary side is also introduced to the B chamber.
When the pressure on the secondary side (= pressure in the B room) rises, a force that lowers the supply / discharge valve rod 6 works. This force can be calculated by the pressure receiving area of the membrane plate × the pressure in the B room.
When the pressure on the secondary side rises and the force for raising and lowering the supply / discharge valve rod 6 is balanced, the valve 7 is closed.
That is, when the following expression (1) is satisfied, the valve 7 is closed and the increase of the secondary pressure is stopped.
[0005]
Pressure receiving area of the membrane plate x pressure in the room A = pressure receiving area of the membrane plate 5 x pressure on the secondary side (1)
From this formula, the following formula is derived.
The pressure in the A chamber = the pressure on the secondary side According to this equation, the pressure on the secondary chamber can be set to a predetermined pressure by setting the pressure in the A chamber.
As shown in FIG. 3, the pressure in the A chamber is set by exciting and demagnetizing the solenoid valve 2 while monitoring the pressure in the A chamber with the pressure sensor 4.
[0006]
(2) When depressurizing the secondary side pressure When the depressurizing solenoid valve 3 is operated and the compressed air in the A chamber of the relay valve section 1 is discharged from the depressurizing solenoid valve 3 to the atmosphere, the pressure in the A chamber is reduced. The The balance of the above-described equation (1) is lost due to the reduced pressure in the A chamber.
That is, the following inequality (2) is established, which means that the supply / discharge valve rod 6 moves downward.
[0007]
The pressure receiving area of the membrane plate × the pressure in the A chamber <the pressure receiving area of the membrane plate × the pressure on the secondary side (2)
When the supply / discharge valve rod 6 moves downward, the compressed air on the secondary side is discharged from the EX port of the supply / discharge valve rod 6 to the atmosphere. For this reason, the pressure on the secondary side is reduced. The decompression continues until the above-described formula (1) is established.
[0008]
And if the front-end | tip (valve seat part) valve 7 of the supply / discharge valve rod 6 closes, the discharge | emission from the EX port of the secondary side compressed air will stop.
Further, according to the above (1), in order to set the secondary side pressure to a predetermined pressure, it is possible to set the pressure in the A chamber.
The pressure in the A chamber is set by exciting and demagnetizing the pressure reducing electromagnetic valve 3 as shown in FIG. 4 while monitoring the pressure in the A chamber with the pressure sensor 4.
[0009]
[Problems to be solved by the invention]
The conventional pressure control valve described above has the following drawbacks.
(1) Since the secondary pressure is set to a predetermined pressure by setting the pressure in the A chamber of the relay valve portion 1 indirectly, the setting accuracy is poor.
(2) Since the structure of the relay valve portion 1 is complicated, it is expensive.
[0010]
[Means for Solving the Problems]
The pressure control valve according to claim 1 of the present invention that solves the above problems includes a chamber A connected to the primary pressure, a chamber B connected to the secondary pressure, and a solenoid valve for stopping supply to the primary pressure. A C chamber connected via a discharge chamber, a D chamber connected to a secondary pressure via a discharge solenoid valve, a supply stop membrane plate separating the A chamber and the C chamber, and the B chamber Between the discharge membrane plate that partitions the D chamber, the first passage that is provided between the A chamber and the B chamber, and is opened and closed by the supply stop membrane plate, and between the B chamber and the atmosphere provided, it consists of a second passage which is opened and closed by the discharging membrane plate, and a supply and discharge valve unit for opening and closing the passage between the chambers in response to a pilot pressure, to the D chamber of the sheet discharge valve unit by introducing secondary pressure as a pilot pressure, and discharge of compressed air to the atmosphere from the B chamber closing said second passage It said discharging solenoid valve for preventing, by introducing a primary pressure as a pilot pressure to the C chamber of the sheet discharge valve portion, of the compressed air from the A chamber by closing the first path to the B chamber Control for de-exciting the solenoid valve by comparing the signal from the pressure sensor and the command pressure with the supply stop solenoid valve for preventing the inflow, the pressure sensor for detecting the secondary pressure of the supply / discharge valve section It consists of a vessel.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A pressure control valve according to one embodiment of the present invention is shown in FIG.
The pressure control valve of this embodiment includes a supply / exhaust valve portion 11 which is a valve body, a supply stop solenoid valve 12, a discharge solenoid valve 13, a pressure sensor 14 and a controller 17.
The supply / discharge valve section 11 opens and closes the compressed air passages a and b in accordance with the pilot pressure from the solenoid valves 12 and 13.
[0012]
That is, the supply / discharge valve section 11 includes a primary chamber A and a chamber C, and a secondary chamber B and a chamber D. The chamber A and the chamber C are partitioned by the supply stop film plate 15, Further, the B chamber and the D chamber are partitioned by a diaphragm 16 put-out ejection. The primary side is connected to the A chamber, and a passage a is provided. One end of the passage a is opened and closed by the supply stop film plate 15, and the other end is connected to the secondary B chamber. Passage b is provided with the secondary side is connected to the B chamber, one end of the passage b is opened and closed by a membrane plate 16 out-out ejection, the other end is open to the atmosphere.
[0013]
A supply stop solenoid valve 12 is connected to the C chamber of the supply / discharge valve section 11. When the supply stop solenoid valve 12 is excited, a part of the compressed air on the primary side is introduced into the C chamber.
Therefore, the supply stop solenoid valve 12 generates a primary pressure as a pilot pressure to the C chamber of the supply / discharge valve section 11.
A discharge electromagnetic valve 13 is connected to the D chamber of the supply / discharge valve section 11. When the discharge electromagnetic valve 13 is demagnetized, a part of the compressed air on the secondary side is introduced into the D chamber.
In addition, when the discharge solenoid valve 13 is excited, the D chamber is opened to the atmosphere.
Accordingly, the discharge solenoid valve 13 generates a secondary pressure or atmospheric pressure as a pilot pressure to the D chamber of the supply / discharge valve section 11.
That is, when the supply stop solenoid valve 12 or the discharge solenoid valve 13 is excited or demagnetized, the C chamber becomes the primary pressure and the D chamber becomes the secondary pressure or atmospheric pressure.
[0014]
On the other hand, a pressure sensor 14 is installed in the passage on the secondary side of the discharge solenoid valve 13.
The pressure sensor 14 detects the secondary pressure of the supply / discharge valve section 11 and outputs the value to the controller 17 as a signal S1.
The controller 17 compares the signal S1 from the pressure sensor 14 with the command pressure signal S2 from the outside, and deenergizes the solenoid valves 12 and 13 so that the secondary pressure becomes the command pressure, and the secondary pressure The pressure is increased or decreased.
The pressure control valve according to the present embodiment having the above configuration has the following operational effects.
[0015]
(1) Increasing the secondary side pressure When the supply stop solenoid valve 12 is demagnetized in accordance with a command from the controller 17, the compressed air is not introduced from the primary side into the C chamber of the supply / discharge valve unit 1.
Therefore, when the compressed air on the primary side is introduced into the A chamber, the supply stop membrane plate 5 is pushed up to the upper side on the C chamber side, so that the passage a is opened, and the A chamber and the B chamber communicate with each other. Compressed air flows into the secondary side.
Thereby, the secondary side pressure is increased.
[0016]
Further, when the discharge solenoid valve 13 is demagnetized in accordance with a command from the controller 17, a part of the compressed air on the secondary side is introduced into the D chamber via the discharge solenoid valve 13.
When the discharge membrane plate 16 is pushed down by this compressed air, the passage b is closed and closed, so that the communication between the B chamber and the atmosphere is cut off and the secondary compressed air is prevented from being discharged to the atmosphere. .
Thereby, the fall of a secondary side pressure is prevented.
[0017]
On the other hand, when the secondary pressure measured by the pressure sensor 14 rises to the command value, the supply stop solenoid valve 12 is excited by a command from the controller 17 and a part of the compressed air on the primary side is stopped. It is introduced into the C chamber via the electromagnetic valve 12 for use.
With this compressed air, the supply stop membrane plate 15 is pushed down to the lower side which is the A chamber side, the passage a is closed, and the communication between the A chamber and the B chamber is cut off.
As a result, the compressed air in the chamber A on the primary side is blocked from flowing into the chamber B on the secondary side.
For this reason, the secondary pressure does not continue to rise, but when it reaches the command value, the rise stops.
[0018]
(2) by a command when the controller 17 for reducing the secondary pressure, when excited the solenoid valve 13 for out-out ejection via the solenoid valve 13 for discharging the compressed air in the D chamber is discharged to the atmosphere. As a result, the passage b is opened, the chamber B is connected to the atmosphere, and the compressed air on the secondary side is discharged to the atmosphere, whereby the pressure on the secondary side is reduced. When the secondary pressure measured by the pressure sensor 14 is reduced to the command value, the discharge solenoid valve 13 is demagnetized by the command from the controller 17.
[0019]
As a result, part of the compressed air on the secondary side is introduced into the D chamber via the discharge solenoid valve 13.
The discharge membrane plate 16 is pushed down by this compressed air, and the passage b is closed and closed, so that the communication between the B chamber and the passage b is cut off and the secondary compressed air is prevented from being discharged to the atmosphere. Therefore, the secondary side pressure is stopped from being further reduced.
[0020]
As described above, the pressure control valve according to the present embodiment has no movable parts such as the conventional exhaust valve rod 6 and the valve 7, has a simple structure, and is reliable in operation.
Further, since the secondary pressure can be directly detected, the setting accuracy is increased.
[0021]
【The invention's effect】
As described above in detail based on the embodiments, the pressure control valve according to the present invention includes a supply / discharge valve section that opens and closes a passage of compressed air between the chambers according to a pilot pressure, and the supply / discharge valve. A discharge solenoid valve that generates a secondary side pressure or an atmospheric pressure as a pilot pressure to the unit, a supply stop solenoid valve that generates a primary side pressure as a pilot pressure to the supply and discharge valve unit, and a supply and discharge valve unit Since it consists of a pressure sensor that detects the secondary pressure, and a controller that compares the signal from the pressure sensor with the command pressure to de-energize the solenoid valve, conventional movable parts such as exhaust valve rods and valves The structure is simple and the operation is reliable.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a pressure control valve according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a conventional pressure control valve.
FIG. 3 is a graph showing the relationship between excitation and demagnetization of the solenoid valve 2 and secondary pressure.
FIG. 4 is a graph showing the relationship between excitation and demagnetization of the pressure reducing solenoid valve 3 and secondary pressure.
[Explanation of symbols]
11 Supply / Discharge Valve Unit 12 Supply Stop Solenoid Valve 13 Discharge Solenoid Valve 14 Pressure Sensor 15 Supply Stop Film Plate 16 Discharge Film Plate 17 Controller S1 Pressure Sensor Signal S2 External Command Pressure Signal

Claims (1)

A chamber connected to the primary pressure, B chamber connected to the secondary pressure, C chamber connected to the primary pressure via the supply stop solenoid valve, and discharge solenoid to the secondary pressure A D chamber connected via a valve, a supply stop membrane plate that partitions the A chamber and the C chamber, a discharge membrane plate that partitions the B chamber and the D chamber, the A chamber, and the B chamber A first passage provided between the chamber and the opening and closing by the supply stop film plate, and a second passage provided between the chamber B and the atmosphere and opened and closed by the discharge film plate. a supply and discharge valve unit for opening and closing the passage between the chambers in response to the pilot pressure,
The discharge solenoid valve that introduces a secondary pressure as a pilot pressure into the D chamber of the supply / discharge valve portion and closes the second passage to prevent discharge of compressed air from the B chamber to the atmosphere ;
The supply stop solenoid valve that introduces a primary pressure as a pilot pressure into the C chamber of the supply / discharge valve portion and closes the first passage to prevent inflow of compressed air from the A chamber to the B chamber. When,
A pressure sensor for detecting a secondary pressure of the supply / discharge valve unit;
A pressure control valve comprising: a controller that compares a signal from the pressure sensor with a command pressure and deenergizes the solenoid valve.

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