CN111623162A - Normally closed type electromagnetic valve control structure of electromagnetic proportional valve - Google Patents

Abstract

A normally closed solenoid valve control structure of an electromagnetic proportional valve is a normally open electronically controlled proportional valve, which has an intake solenoid valve and an exhaust solenoid valve inside, and the intake solenoid valve has an intake solenoid valve. port, an air outlet, and an exhaust port, and the exhaust solenoid valve also has an intake port, an air outlet, and an exhaust port; the intake solenoid valve is a normally closed type, and the exhaust solenoid valve The valve is also normally closed. When a power failure occurs, the exhaust solenoid valve will return to the closed state of the intake port, the exhaust port is connected to the exhaust port, and the normally open electronically controlled proportional The pressure of a fluid in an air pressure control chamber in the valve is discharged from the air outlet and the exhaust port, so that the pressure of the fluid inside can be released when the power is turned off.

Description

Control Structure of Normally Closed Solenoid Valve of Solenoid Proportional Valve

technical field

The present invention relates to a control structure of a normally closed solenoid valve of an electromagnetic proportional valve, in particular to a normally closed type and normally open type that can be excited by electric power, so that the internal fluid pressure can be released in a power-off state. and for security purposes.

Background technique

The electronically controlled proportional valve is a fairly common fluid flow path control device in industrial equipment. Please refer to Fig. 3. The interior of a normally open electronically controlled proportional valve (90) is usually provided with: The normally closed intake solenoid valve (91) and the normally closed exhaust solenoid valve (92) used for exhaust, both of the aforementioned solenoid valves are normally closed, that is, the valve of the solenoid valve is not energized. The mouth is in a state of being closed and not circulating;

When the two solenoid valves adjust the intake air volume through the externally connected controller, the pressure of the air pressure control chamber (93) in the normally open solenoid valve (90) can be changed, and the air pressure control chamber (93) can drive The air pressure chamber (94) is opened and closed, and the required outlet pressure is formed by controlling the flow rate of the fluid (914) flowing through the air pressure chamber (94);

In more detail, please refer to FIG. 4 again. Generally, the normally closed intake solenoid valve (91) of the prior art is provided with an air guide valve rear cover (910), an air inlet (911), a The air outlet (912) and an exhaust port (913), generally before being energized and excited, the fluid (F) entering through the air inlet (911) will be blocked by the air guide valve rear cover (910) ;

Please refer to FIG. 5 , when the excitation is performed, the back cover (910) of the air guide valve will be in an open state, so that the originally blocked fluid (914) passes through and is output through the air outlet (912);

Please refer to FIG. 6 again, and when the excitation is stopped, the rear cover (910) of the air guide valve will be closed, and part of the fluid (914) will be discharged from the exhaust port (913), and part of it will be discharged by the exhaust port (913). Blocked at the intake port (911); and the structure of the other normally closed exhaust solenoid valve (92) and the related operation of the energization excitation are all equivalent to the normally closed intake solenoid valve (91), so it will not be repeated. Repeat.

When the above-mentioned two solenoid valves are normally closed, they will remain normally closed after the power is turned off. At this time, the pressure inside the air pressure control chamber (93) will maintain the inflated state, so the air pressure chamber will also be maintained. (94) opening degree, and then control the flow rate of the air pressure control chamber (93) to form the outlet pressure;

However, there is a safety problem in this working state, because the normally open electronically controlled proportional valve (90) will remain in a saturated state after a power failure. It is easy to cause the failure of the electronically controlled proportional valve, or it cannot be eliminated immediately.

SUMMARY OF THE INVENTION

In view of the double normally closed design in the existing solenoid valve, the safety purpose to be achieved in the industry still has its shortcomings; therefore, the main purpose of the present invention is to provide a solenoid valve, which can be In the state, the internal pressure can be completely discharged, so that the problem of easy failure can be improved in the case of emergency power failure.

In order to achieve the above-mentioned purpose, the present invention discloses a normally closed solenoid valve control structure of an electromagnetic proportional valve, which comprises: a normally open electronically controlled proportional valve, which has an intake solenoid valve and an exhaust solenoid valve inside. The intake solenoid valve is provided with an intake port, an air outlet, and an exhaust port, and the exhaust solenoid valve is provided with an inlet, an air outlet, and an exhaust port; and the intake solenoid valve is Normally closed type, the exhaust solenoid valve is normally closed. When a power failure occurs, the exhaust solenoid valve will restore the intake port to a closed state, and the exhaust port is connected to the exhaust port, and can allow A fluid pressure in an air pressure control chamber in the normally open electronically controlled proportional valve is discharged from the air outlet and the exhaust port, so that the internal fluid pressure can be relieved when the power is cut off.

The secondary purpose of the present invention is that the exhaust solenoid valve is in an electrified excitation state in a normal state.

The secondary purpose of the present invention is that the intake solenoid valve is in a non-excited state under normal conditions.

The secondary purpose of the present invention is that the intake solenoid valve is of a normally open type.

The secondary purpose of the present invention is that, when the intake solenoid valve is a normally open type, it is in an electrified excitation state in a normal state.

Compared with the prior art, the normally closed electromagnetic valve control structure of the electromagnetic proportional valve provided by the present invention can completely discharge the internal pressure in the state of power failure, so that it is easy to cause failure in the case of emergency power failure. problem can be improved.

Description of drawings

1 is a schematic diagram of a normally closed solenoid valve control structure of a solenoid proportional valve disclosed in an embodiment of the present invention under normal operation.

2 is a schematic diagram of the normally closed solenoid valve control structure of the solenoid proportional valve disclosed in the embodiment of the present invention during exhaust and power failure.

FIG. 3 is a schematic structural diagram of the prior art.

FIG. 4 is a schematic diagram of a normally closed intake solenoid valve of the prior art during normal operation.

FIG. 5 is a schematic diagram of the conventional normally closed intake solenoid valve when it is energized and excited.

FIG. 6 is a schematic diagram of a conventional normally closed intake solenoid valve when it is energized and excited.

Description of reference numbers:

10-Normally open electronically controlled proportional valve

11-Voltage control room

12-Air pressure chamber

20-Intake solenoid valve

P1 - air intake

A1-air outlet

R1 - exhaust port

30-Exhaust solenoid valve

P2 - air intake

A2 - air outlet

R2 - exhaust port

F-fluid

90-Normally open electronically controlled proportional valve

91-normally closed intake solenoid valve

910-Guide valve back cover

911 - air intake

912-air outlet

913-exhaust port

914-Fluid

92-normally closed exhaust solenoid valve

93-Air pressure control room

94 - Air Pressure Chamber

Detailed ways

The embodiment of the present invention discloses a normally closed solenoid valve control structure of an electromagnetic proportional valve, comprising: a normally open electrically controlled proportional valve 10 , the left and right sides of the normally open electrically controlled proportional valve 10 are respectively It is respectively provided with: an intake solenoid valve 20 and an exhaust solenoid valve 30. The intake solenoid valve 20 is internally provided with an intake port P1, an air outlet A1, and an exhaust port R1, and the exhaust port is The interior of the solenoid valve 30 is provided with an air inlet P2, an air outlet A2, and an air outlet R2;

The aforementioned intake solenoid valve 20 is of the normally closed type, and the exhaust solenoid valve 30 is also of the normally closed type. Here, the normally closed type can be understood as disconnecting the flow paths of each ventilation when no excitation is applied.

In the normally closed solenoid valve control structure of the solenoid proportional valve disclosed in the embodiment of the present invention, when the power-off state occurs, the exhaust solenoid valve 30 will be restored to the closed state first, and the air outlet A2 is communicated with the exhaust port R2 , and can allow the pressure of a fluid F in a pneumatic control chamber 11 in the normally open electronically controlled proportional valve 10 to be discharged through the air outlet A2 and the exhaust port R2, so that the internal pressure of the fluid F can be powered off At the same time, the internal structure of the structure can achieve the purpose of pressure relief, can operate normally in the case of sudden power failure, and can also maintain the overall safety of the mechanism.

In the aforementioned structure, under normal conditions, the exhaust solenoid valve 30 is in a state of electrification and excitation, and the fluid F in the air pressure control chamber 11 will be closed due to the normally closed exhaust solenoid valve 30 using the air outlet A2 and the exhaust port R2. In order to regulate the pressure of the fluid F in the air pressure control chamber 11, the pressure is kept in a stable state, and the intake solenoid valve 20 at this time is in a non-electric excitation state.

The aforementioned intake solenoid valve 20 can also be replaced from a normally closed type to a normally open type, and the exhaust solenoid valve 30 is also normally closed, and when the intake solenoid valve 20 is normally open, it is normally In the same way, it must be changed to the power-on excitation state, thereby achieving the purpose of power-off and pressure-relief.

To sum up, the normally closed solenoid valve control structure of the solenoid proportional valve disclosed in the embodiment of the present invention, through the original intake solenoid valve 20 and the exhaust solenoid valve 30, the inside of the original double normally closed solenoid valve is penetrated. By changing the flow path of the original fluid F and cooperating with electric excitation, the internal structure of the original solenoid valve does not need to be greatly changed, and the purpose of pressure relief can also be achieved through power failure, which further increases the overall safety in use, and is more reliable. By changing to a normally open type and a normally closed type solenoid valve, the aforementioned purpose is achieved.

The structure, features and effects of the present invention have been described in detail above according to the embodiments shown in the drawings. The above are only the preferred embodiments of the present invention, but the scope of the present invention is not limited by the drawings. Changes made to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, shall fall within the protection scope of the present invention as long as they do not exceed the spirit covered by the description and drawings.

Claims (5)

1. The normally closed type electromagnetic valve control structure of the electromagnetic proportional valve is characterized in that: the method comprises the following steps: an electrically controlled normally closed proportioning valve (10) having in its interior: an air inlet solenoid valve (20) internally provided with an air inlet (P1), an air outlet (A1) and an air outlet (R1); and an exhaust solenoid valve (30) provided therein with an air inlet (P2), an air outlet (A2), and an exhaust port (R2); the air inlet solenoid valve (20) is of a normally closed type, the air outlet solenoid valve (30) is of a normally closed type, the air inlet (P2) in the air outlet solenoid valve (30) is used for air exhaust, the air outlet (A2) is used for air inlet, and the air outlet (R2) is used for air outlet, when power failure occurs, the air inlet (P2) can be recovered to be in a closed state by the air outlet (A2) and the air outlet (R2) are communicated, the pressure of fluid (F) in an air pressure control chamber (11) in the normally open type electric control proportional valve (10) can be discharged from the air outlet (A2) and the air outlet (R2), and the pressure of the fluid (F) in the normally open type electric control proportional valve can be relieved when the power failure occurs.

2. The normally closed type solenoid valve control structure of a solenoid proportional valve according to claim 1, wherein the exhaust solenoid valve (30) is normally energized.

3. The normally closed type solenoid valve control structure of a solenoid proportional valve according to claim 1, wherein the intake solenoid valve (20) is normally in an unenergized and energized state.

4. The normally closed type solenoid valve control structure of a solenoid proportional valve according to claim 1, wherein the intake solenoid valve (20) is normally open type.

5. The normally closed type solenoid valve control structure of a solenoid proportional valve according to claim 4, wherein when the intake solenoid valve (20) is normally open, it is normally energized.

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