DE102016117358A1 - Electro-pneumatic actuator - Google Patents

Abstract

An electropneumatic actuator for actuating a shut-off valve of a line for a gaseous flow medium, comprising - a drivable in two directions, fluid-actuated rotary motor, - an electropneumatic circuit that controls the pressure medium supply to the rotary motor, - a control valve, preferably a ball valve (31), - a distributor (32) for the pressure medium, which is connected to the control valve (31), - a main control block (46) connected to the distributor (32), - two electro-pneumatic circuit-controlled 3 / (3) controlled in the main control block (46). Two-way solenoid valves (37, 38), of which the one valve (37) for driving the rotary motor in a first direction of rotation for closing the shut-off valve via a first supply line (39) is connected to the rotary motor, while the second 3/2 -Way solenoid valve (38) for driving the rotary motor in the second direction of rotation to open the shut-off valve via e A second line (40) is connected to the rotary motor, characterized by a branch line connected to the distributor (32) and an actuating element (43) for direct sole connection of the distributor (32) to the branch line, which is inserted into an additional control block (46 ) to which in this control block (46) integrated, leading to the rotary motor lead (39) is connected.

Description

The invention relates to an electro-pneumatic actuator according to the preamble of patent claim 1.

Such actuators are used to actuate, close or open the fitting (e.g., ball valve, gate valves, valves, butterfly valves, etc.) e.g. a gas line or a conduit for a gaseous, pressurized flow medium.

When a fault occurs in the gas line system, the pneumatic rotary motor, in particular multi-disk motor, is controlled by the electro-pneumatic circuit such that the rotary motor acts on the actuator so that the valve is closed. This closing of the valve in normal operation requires that the electrical circuit and, as a rule, also the pneumatic circuit be fully functional, i. is / are operational.

The normal function of an electropneumatic actuator is as follows:
At the entrance to the pneumatic unit is purified from the main gas line branched, purified gas at a reduced pressure of 7 bar maximum and flows through an internal pressure reducer and lubricator unit in a main control block with integrated 3/2-solenoid valve system in the Pneumatic rotary motor, these solenoid valves are controlled by an electrical control of 24 V DC and directional torque switch.

In the case of a fault in the field of electrical circuit and possibly also the pneumatic circuit, it has hitherto been necessary to close the gas line fitting in manual operation over the entire travel, for example by pressing a handwheel. The adjustment of the gas line fitting in the closed position by means of the handwheel is relatively time-consuming and extremely risky for the handwheel-operated operator.

The invention has for its object to make an electro-pneumatic rotary actuator so that for emergency operation, i. when a fault in the gas line system and failure of the electrical circuit closing the gas line fitting in high-speed operation is possible, and can be dispensed with closing the gas line fitting by pressing a handwheel.

To solve this problem, the features of the characterizing part of claim 1 serve.

By installing a safety unit, preferably in the form of an additional control block, the actuator can be closed quickly by operating an inventively provided Notbetätigungselementes, preferably an emergency lever in case of failure in the gas line system with simultaneous failure of the electro-pneumatic circuit, the gas line fitting. This feature protects the operator and the gas piping system, including shut-off valves, from major damage, even against possible explosions. This is especially true for highly explosive substances, e.g. Gas, important. By using the electro-pneumatic actuator according to the invention substantial energy savings occur because the actuator according to the invention can be operated with "own medium", e.g. Gas from the gas main.

The electrical control is preferably carried out with 24 V DC, or in particular on customer request with 110 V 50 Hz alternating current, so that e.g. Fittings in the form of butterfly valves or ball valves up to 50.00 Nm can be used.

The in 1 shown mechanical part of the electro-pneumatic actuator is used to actuate, close or open the valve (eg ball valve, slide, valve, butterfly valve, etc.), for example, a gas line. This electro-pneumatic actuator contains the following essential elements [according to MAD drawing no. B190-10.4]:

LIST OF REFERENCE NUMBERS

1

Pneumatic rotary motor, especially vane motor 1

2

Motorwellenstirnrad

3

Worm shaft spur gear

4

worm shaft

5

Auger shaft

6

worm 6 for the valve to be operated

7

screw gear

8th

helical gear

9

handwheel

10

two ball bearings

11

two ball bearings

12

Radial shaft seal

13

Radial shaft seal

14

O-ring

15

O-ring

16

two torque switches

17

two way switches

18

Roller counter complete

19

complete control

39

Lines, to the pneumatic rotary motor 1 affiliated

40

Lines, to the pneumatic rotary motor 1 affiliated

The function or mode of operation of in 1 actuator shown results from the Enumeration of his individual elements. This actuator is used to operate or control the worm wheel 6 , which causes the opening or closing of the gas line fitting as the drive element.

This in 1 shown actuator is the in 2 assigned electro-pneumatic circuit S assigned. This circuit S contains in the usual way an electric circuit ES, which activates a pneumatic circuit PS, in order in the event of a fault, in particular in the region of the gas main line, the pneumatic rotary motor 1 so to steer that over the worm wheel 6 the connected gas line fitting and thus the gas main is closed.

In 2 the pneumatic circuit PS is shown in its rest position with proper normal operation of the gas line system and the electro-pneumatic circuit.

The pneumatic rotary motor 1 is for closing the gas line valve in the clockwise direction and re-opening the valve in reverse rotation drivable. The pneumatic rotary motor 1 is for the clockwise rotation to close the valve with the pipe 39 to the 3/2-way solenoid valve 21 connected or connectable, which is connected via the lines a1, a2 and a3 to a compressed gas source, in particular the gas main, connected or connectable. In the line branch a2 / a3 are in accordance with the 3 and 4 an oiler 35 and a pressure reducer 34 arranged.

For counterclockwise rotation of the pneumatic rotary motor 1 To open the valve is the pneumatic rotary motor 1 to a line 40 and to a solenoid valve 38 , in particular 3/2-way valve, connected or connectable. The 3/2-way solenoid valve 38 is under the interposition of the oiler 35 and the pressure reducer 34 connected to the gas supply line a3, which is acted upon by a gas pressure of preferably at most 7 bar.

In the event of a malfunction or a failure, in particular in the region of the gas main line, the solenoid valve will close to close the gas line fitting in normal operation with functional electrical circuit ES 37 from the in 2 shown rest position adjusted to an activation position in which the pneumatic rotary motor 1 connected to the line branch a1, a2, a3 and thereby driven in the clockwise direction, whereby on the worm wheel 6 the gas line fitting is closed before the 3/2-way solenoid valve 37 is put back into the rest position.

To reopen the gas line fitting after the fault has been rectified, the electric circuit ES controls the 3/2-way solenoid valve 38 so that it is out of his in 2 shown rest position is adjusted to the activation position, and the pneumatic rotary motor 1 through the pipe 40 pressurized gas and driven in reverse.

The above-described operation of the pneumatic circuit PS assumes that the electric circuit ES is in proper condition and is fully functional.

In the case of a fault or failure of the gas line system, in particular in the electronic circuit ES, usually the gas line fitting by turning or pressing the handwheel 9a moved to the closed position to close the gas line fitting and shut off the gas main.

The adjustment of the gas line fitting in the closed position by means of the handwheel 9 is time consuming and extremely risky for the handwheel 9 actuating operator.

definitions

• – Zum Schließen der Gasleitungs-Armatur wird der Pneumatik-Drehmotor 1 über das von der Elektronikschaltung ES angesteuerte 3/2-Wege-Magnetventil 37 durch die Leitung 39 mit Druckgas versorgt und rechtsdrehend angetrieben
• – Druckgas mit einem Maximaldruck von 7 bar steht beim Kugelhahn 31 an und strömt bei geöffnetem Kugelhahn 31 zu dem Verteiler 32 und anschließend durch die Zulaufleitung 33 zu einem Druckminderer 34 und dann zu dem Öler 35. Von dem Öler 35 strömt das Druckgas zur Leitung 36 und von da zu dem von der Elektroschaltung ES angesteuerten 3/2-Wege-Magnetventil 37 im Hauptsteuerblock 46. Von dem 3/2-Wege-Magnetventil 37 strömt das Druckgas durch die Zulaufleitung 39 zu dem Pneumatik-Drehmotor 1. Das Druckgas verlässt den Drehmotor 10 durch die in diesem Fall als Abgaleitung dienende Leitung 40 und strömt durch ein Abgaselement 41 zu dem Schalldämpfer 42, aus dem es in die Atmosphäre austritt.
• – Die Leitungen 39 und 40 sind an einen zusätzlichen Steuerblock 44 angeschlossen.
• – Zum Öffnen der Gasleitungs-Armatur erfolgt die Druckgaszufuhr von dem Kugelhahn 31 bis zur Zulaufleitung 36 in der gleichen Weise wie oben beschrieben. Hinter der Zulaufleitung 36 strömt das Druckgas zu dem 3/2-Wege-Magnetventil 38 im Hauptsteuerblock 46 und durch die nunmehr als Zulaufleitung wirkende Leitung 40 zu dem Drehmotor 1, der linksdrehend die Gasleitungs-Armatur öffnet. Das Abgas tritt durch den Schalldämpfer 12 in die Atmosphäre aus.

NORMAL OPERATION with functional electronic circuit ES with reference to 2 and 3 :

• - To close the gas line fitting of the pneumatic rotary motor 1 via the controlled by the electronic circuit ES 3/2-way solenoid valve 37 through the pipe 39 supplied with compressed gas and driven clockwise
• - Compressed gas with a maximum pressure of 7 bar is at the ball valve 31 and flows with open ball valve 31 to the distributor 32 and then through the supply line 33 to a pressure reducer 34 and then to the oiler 35 , From the oiler 35 the compressed gas flows to the line 36 and from there to the driven by the electric circuit ES 3/2-way solenoid valve 37 in the main control block 46 , From the 3/2-way solenoid valve 37 the compressed gas flows through the supply line 39 to the pneumatic rotary motor 1 , The compressed gas leaves the rotary motor 10 by the line serving as discharge line in this case 40 and flows through an exhaust element 41 to the muffler 42 from which it exits into the atmosphere.
• - The pipes 39 and 40 are to an additional control block 44 connected.
• - To open the gas line fitting, the compressed gas is supplied from the ball valve 31 to the supply line 36 in the same way as described above. Behind the supply line 36 the compressed gas flows to the 3/2-way solenoid valve 38 in the main control block 46 and by the now acting as a supply line line 40 to the rotary motor 1 , which opens the gas line valve clockwise. The exhaust gas passes through the muffler 12 into the atmosphere.

EMERGENCY OPERATION

In non-functional operation in case of failure in "danger in delay" an inventively provided actuator, preferably in the form of an emergency lever 53 from the in 3 illustrated normal operation position in the in 4 shown emergency operating position pivots, whereby all under the function "normal operation" described control functions are mechanically locked. The over the ball valve 31 supplied compressed gas flows directly from the manifold 32 through a branch line, not shown in the control block 44 and through the line 39 in the pneumatic rotary motor 10 , from which the gas line fitting is moved clockwise to the shut-off position.

The exhaust gas from the rotary engine 10 flows through the effective as exhaust pipe line 40 in the control block 44 They pass through an exhaust outlet 45 leaves. Upon reaching the closed position of the gas line fitting is the emergency operating lever 43 automatically, preferably pivoted back by a return spring, not shown, to the starting position, so that the actuator is again in its normal operating position for and after performing necessary maintenance.

For the electrical control of the two 3/2-way solenoid valves 37 and 38 are in the field of electric circuit ES parent way switch WER and WEL on the one hand for the clockwise rotation of the rotary motor 1 and on the other hand, the left-hand rotation of the rotary motor provided. There are also higher-level clockwise torque switch DER and anti-clockwise torque switch DEL provided.

Claims (7)

Electro-pneumatic actuator for actuating a shut-off valve of a line for a gaseous flow medium, comprising - a pressure-medium-operated rotary motor which can be driven in two directions of rotation ( 1 ), - an electro-pneumatic circuit (EL), the pressure medium supply to the rotary motor ( 1 ), - a control valve, preferably a ball valve ( 31 ), - one to the control valve ( 31 ) connected distributor ( 32 ) for the pressure medium, - one to the distributor ( 32 ) connected main control block ( 46 ), - two in the main control block ( 46 ) integrated, controlled by the electro-pneumatic circuit (ES) 3/2-way solenoid valves ( 37 . 38 ), of which one valve ( 37 ) for driving the rotary motor in a first direction of rotation to close the shut-off valve via a first supply line ( 39 ) to the rotary motor ( 1 ), while the second 3/2-way solenoid valve ( 38 ) for driving the rotary motor ( 1 ) in the second direction of rotation for opening the shut-off valve via a second line ( 40 ) is connected to the rotary motor, characterized by a to the distributor ( 32 ) connected branch line and an actuating element ( 43 ) for direct sole connection of the distributor ( 32 ) to the branch line, which in an additional control block ( 46 ) to which in this control block ( 46 ), to the rotary motor ( 1 ) leading supply line ( 39 ) connected. Actuator according to claim 1, characterized by a shut-off mechanism, by which upon actuation of the actuating element ( 43 ) to the main control block ( 46 ) leading connection of the distributor ( 32 ) is interrupted. Actuator according to claim 2, characterized in that upon actuation of the actuating element ( 43 ) the second to the rotary motor ( 1 ) connected line ( 40 ) to a pressure medium outlet ( 45 ) connected. Actuator according to claim 3, characterized in that the line ( 40 ) to the additional control block ( 46 ) connected to the pressure medium outlet ( 45 ) is provided. Actuator according to claim 1, characterized in that the rotary motor ( 1 ) is a vane motor. Actuator according to claim 1, characterized in that the actuating element ( 43 ) is a lever, by its pivoting in case of emergency, the distributor ( 32 ) to the additional control block ( 46 ) and to the rotary motor ( 1 ) leading supply line ( 49 ) is completed. Actuator according to claim 1, characterized by an adjusting mechanism, which upon reaching the closed position of the pressure medium line fitting the lever ( 43 ) is preferably automatically pivoted back into the starting position by means of a return spring, so that the actuator is returned to its normal operating position for carrying out and after performing necessary maintenance.

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