KR200224590Y1 - Hydraulic force control apparatus for hydraulic valve - Google Patents

Abstract

The present invention relates to a hydraulic control device of a hydraulically actuated valve, the hydraulic circuit portion is installed in parallel, the open side hydraulic line (23a) and the closed side hydraulic line (23b), pump line (24a) and tank line (24b) ) Uses a relatively small diameter pipe, so the choice of components such as various valves installed therein can be expanded, and the design freedom can be increased, and at the same time, the opening side hydraulic line 23a and the opening side port 13a are provided. ), Between the closing side hydraulic line 23b and the closing side port 13b, between the pump line 24a and the intermediate stop valve 26, and between the tank line 24b and the intermediate stop valve 26. Between the open side hydraulic line 23a and the close side hydraulic line 23b and the pump line 24a and the tank line 24b, the connecting pipe 13c and 13d of the larger diameter pipe are larger in diameter. Even when both sides of the hydraulic circuit part connected in parallel by connecting (24c) and (24d) are used, The supply and return of oil is a dongyong so smoothly.

Description

HYDRAULIC FORCE CONTROL APPARATUS FOR HYDRAULIC VALVE}

The present invention relates to a hydraulically operated butterfly valve, and in particular, the diameter of the hydraulic line connecting the hydraulic circuit unit and the hydraulic cylinder and the hydraulic line connecting the hydraulic circuit unit, the pump line and the tank line, the hydraulic line and the pump line and The present invention relates to a hydraulic control device for a hydraulically actuated butterfly valve having a greater design freedom by widening the selection range of various valves and the like installed in the hydraulic circuit part by being larger than the diameter of the tank line.

In general, a butterfly valve is classified into a manually operated butterfly valve, an electrically driven butterfly valve and a hydraulically driven butterfly valve according to an open / close drive method.

Conventional hydraulically-driven butterfly valves have a cylindrical valve body, a valve disc that is rotatably installed in the valve body, a hydraulic opening and closing mechanism including a hydraulic cylinder for opening and closing the valve disc, and opening and closing the hydraulic cylinder. It is configured to include a hydraulic circuit for supplying the oil for.

When the hydraulically operated butterfly valve is operated by the control unit, power is applied to the solenoid valve open / close control valve to operate the open / close control valve to the open position, and the oil pressurized by the oil pump is supplied to the open side port of the hydraulic cylinder. When the piston rod of the hydraulic cylinder is retracted, the valve disc is rotated in the opening direction, and the oil supplied during the closing operation flows out from the closing side port to return to the oil tank. Is operated in the closed position so that the oil pressurized by the oil pump is supplied to the closed side port of the hydraulic cylinder, the piston rod of the hydraulic cylinder moves forward, the valve disc rotates in the closing direction, and the oil supplied during the open operation flows out from the open side port. And return to the oil tank.

Thus, in order to maintain the open or closed state, an intermediate stop valve having an oil supply port and a shutoff port is installed between the pump line and the open / close control valve. In order to be connected through and maintained in a constant open or closed state, the blocking port is configured to be located between the pump line and the tank line and the open / close control valve.

On the other hand, when a butterfly valve is used in a large pipe over 1000mm in diameter, such as a water supply pipe, when the opening and closing operation is performed at a high speed, there is a risk of damaging the pipe, a joint, or a valve due to a large pressure in the pipe line. Generally, a pilot check valve and a throttle / check valve are installed in the middle of the open side hydraulic line and the close side hydraulic line to fully open the cylinder by reducing the flow rate of oil flowing through the open side hydraulic line and the closed side hydraulic line. It is designed to take more than 1 minute to fully open or fully open at.

In addition, when an emergency such as a power failure occurs, power is cut off from the solenoid valve open / close control valve to operate.

On the other hand, the butterfly valve installed in such a large pipeline is closed automatically when the power is cut off by the opening / closing control valve, which is a solenoid valve, when the power failure occurs.

However, even in the case of a power failure, oil exiting from the open side port of the hydraulic cylinder is returned to the tank line through the open side hydraulic line as in the normal closing operation. Since valves and throttle / check valves are installed, the time required for oil to return to the oil tank becomes longer, so it does not close quickly and takes more than 1 minute, causing damage to pipelines and valves due to pressure and shock. There was a problem that can not respond quickly to an emergency, such as causing a serious problem that is.

Therefore, the inventor has devised an emergency closing device of a hydraulically operated butterfly valve such as Utility Model Registration No. 182633.

The emergency closing device of this pre-registration design connects the emergency closing oil return line between the tank line and the position closer to the hydraulic cylinder side than the throttle / check valve on the open side hydraulic line, and the power is turned on in the middle of the emergency closing oil return line. It is equipped with a shot-off valve that shuts off the emergency closing oil return line when it is applied and opens the emergency closing oil return line when the power is cut off.Oil returned to the oil tank from the open side port of the hydraulic cylinder during emergency closing operation. The emergency closing operation is performed quickly by returning to the oil tank through the emergency closing oil return line opened by the shot-off valve, so that the emergency closing operation can be performed quickly so that the emergency response can be promptly responded.

However, the hydraulically actuated butterfly valve of the prior art and the preliminary design has been provided with a heat insulation control valve and a throttle / check valve of the hydraulic circuit part insulated, and the hydraulic lines have a relatively small diameter so that the hydraulic force There was a problem of narrowing the control range.

In addition, when the diameters of the hydraulic lines in which the opening / closing control valve and the throttle / check valve of the hydraulic circuit are installed are all large, the selection of parts such as the opening / closing control valve and the throttle / check valve is narrow and disadvantageous in terms of design freedom. There was this.

That is, in general, the hydraulic line mainly uses a 1/2 inch diameter, and the size of various valves, etc. are manufactured to match the 1/2 inch diameter, so 3/4 inch diameter to widen the adjustment range of the hydraulic force. In the case of using, the problem is that the choice of components such as various valves is narrowed and the design freedom is lowered.

Accordingly, an object of the present invention is to provide a hydraulic control device of a hydraulically-operated butterfly valve that can widen the selection of components and increase the design freedom and at the same time increase the hydraulic power control range.

1 is a side view and a hydraulic system diagram of a valve showing a normal open state of a hydraulically operated butterfly valve to which a hydraulic control device according to the present invention is applied.

2 is a front view of the valve of FIG.

Figure 3 is a side view and a hydraulic system of the valve showing a normal close (normal) state of the hydraulically operated butterfly valve to which the hydraulic control device according to the present invention is applied.

4 is a front view of the valve of FIG.

5 is a side view and a hydraulic system showing an intermediate stop state of the hydraulically operated butterfly valve to which the hydraulic control device according to the present invention is applied.

Figure 6 is a front view and a hydraulic system of the valve showing the emergency close (emergency close) state of the hydraulically driven butterfly valve applied hydraulic control device according to the present invention.

** Description of symbols for the main parts of the drawing **

1: valve body 2: valve disc

12: hydraulic cylinder 13a: opening side port

13b: closed port 21: oil tank

22: oil pump 23a: open side hydraulic line

23b: Closed side hydraulic line 24a: Pump line

24b: main tank line 24c: auxiliary tank line

25: on-off control valve 30: emergency return oil return line

31: Shot-off valve 23c, 23d, 24c, 24d: connector

Cylindrical valve body and in order to achieve the object of the present invention; A hydraulic cylinder for driving the valve; An oil tank for storing the opening and closing driving oil, a main oil pump for compressing the opening and closing driving oil of the oil tank, an opening side hydraulic line connected to the opening side port of the hydraulic cylinder, and a closing side port of the hydraulic cylinder A closed side hydraulic line connected to the main line, a pump line connected to the main oil pump, a tank line connected to the oil tank, the open side hydraulic line, a closed side hydraulic line and the pump line is installed between the tank line A hydraulic circuit part having valves for selectively controlling the main oil pump to the open side port and the close side port of the hydraulic cylinder and controlling the flow rate of the oil for opening / closing operation, the hydraulic circuit part being installed in parallel The open side hydraulic line, the close side hydraulic line, the pump line and the tank line use conventional relatively small diameter pipes. The open side hydraulic line and the close side hydraulic line between the open side hydraulic line and the open side port, between the closed side hydraulic line and the closed side port, between the pump line and the intermediate stop valve, and between the tank line and the intermediate stop valve. It is designed to smoothly supply and return oil for opening and closing driving, even when both sides of the hydraulic circuit part connected in parallel are connected by connecting the connecting pipes of relatively large diameter pipes, which are larger in diameter than the lines, pump lines and tank lines, respectively. A hydraulic control device of a hydraulically actuated valve is provided.

Hereinafter, the emergency closing device of the butterfly valve according to the present invention will be described in detail according to the embodiment shown in the accompanying drawings.

1 and 2 are views showing a normal closed state of the butterfly valve to which the emergency closing device is applied according to the present invention, Figures 3 and 4 are views showing a normal closed state, the emergency closing device according to the present invention is applied As shown in the drawing, the butterfly valve is rotatably installed at both ends of the cylindrical valve body 1 and the support shafts 2a and 2b on the valve body 1, thereby providing an intermediate portion of the valve body 1. To the valve disc 2 for opening and closing, the hydraulic opening and closing mechanism 10 coupled to one side support shaft 2a of the valve disc 2 to open and close the valve disc 2, and the hydraulic opening and closing mechanism 4 It comprises a hydraulic circuit unit 20 for supplying the hydraulic pressure for the opening and closing operation.

A valve seat 1a is formed on an inner circumferential surface of the valve body 1, and an outer circumference of the valve disc 2 is formed in a round shape so as to be in close contact with the valve seat 1a.

Shaft covers 3a and 3b for supporting the support shafts 2a and 2b are formed on both sides of the outer circumferential surface of the valve body 1.

The hydraulic opening / closing mechanism 10 includes an opening / closing mechanism body 11 installed at one side of the valve body 1, a hydraulic cylinder 12 installed at the opening / closing mechanism body 11, and the hydraulic cylinder 12. It consists of a link mechanism 14 for transmitting a linear reciprocating motion to the one side support shaft (2a) with a rotational force.

The hydraulic cylinder 12 is fixed to the opening mechanism body 11 to be installed so that the piston rod 12a protrudes downward.

The link mechanism 14 has a first link 15 connected to the piston rod 12a of the hydraulic cylinder 12 by a hinge pin 15a and one end fixed to the one side support shaft 2a, and the other end thereof. The second link 16 is connected to the first link 15 by a hinge pin 16a.

One side of the opening and closing mechanism body 11 is provided with an opening and closing angle indicator 17 for displaying the rotation angle of the support shaft (2a, 2b) and the valve disk (2).

The opening / closing angle indicator 17 is composed of an indicator 17a fixed coaxially with the one side support shaft 2a, and an indication disc 17b fixed to the opening / closing mechanism body 11.

The indicator disk 17b is marked with a scale 17c indicating the opening and closing and opening and closing angles.

The hydraulic circuit unit 20 includes an oil tank 21 for storing oil, a main oil pump 22 for compressing oil in the oil tank 21, and an opening side port 13a of the hydraulic cylinder 12. The open side hydraulic line 23a connected, the close side hydraulic line 23b connected to the closing side port 13b of the hydraulic cylinder 12, and the pump line 24a connected to the main oil pump 22. ), The main tank line 24b and the auxiliary tank line 24c connected to the oil tank 21, the open side hydraulic line 23a, the closed side hydraulic line 23b and the pump line 24a, It is installed between the main tank line 24b to selectively connect the oil pump 22 to the open side port 13a and the close side port 13b of the hydraulic cylinder 12, and to hydraulically connect the oil tank 21. And an open / close control valve 25 to be selectively connected to the open side port 13a and the close side port 13b of the cylinder 12.

The open / close control valve 25 has a P ↑ A port 25a and a B ↓ T port 25b at a first position where power is applied, and P↗ at a second position when power is cut off. A 4 port 2 position solenoid valve with a B port 25c and an A 포트 T port 25d is used.In the open position with the power applied, the P ↑ A port 25a is opened by the solenoid action. The pump line 24a is connected to the open side hydraulic line 23a, and the B ↓ T port 25b is connected to the main tank line 24b and the closed side hydraulic line 23b. In the closed position, the P B B port 25c connects the pump line 24a and the closing side hydraulic line 23b by the restoring force of the spring, and the A↘T port 25d opens the opening side hydraulic line 23a. And the main tank line 24b and the auxiliary tank line 24c are installed to be in a state of connecting.

An intermediate stop valve 26 is installed between the open / close control valve 25 and the pump line 24a and the main tank line 24b.

The intermediate stop valve 26 has a P ↑ X port 26a and an X ↓ T port 26b at a first position located when power is applied, and P↗ at a second position located when the power is cut off. A 4-port 2 Position solenoid valve with a B port 26c and an X↘T port 26d is used, and in the energized open / closed operating position, the P↗B port 26c is the pump line 24a. ) Is selectively connected to the P ↑ A port 25a or P↗B port 25c of the open / close control valve 25, and the P ↑ X port 26a is pumped at the intermediate stop position where the power is cut off. It is connected so that it may be connected to the line 24a, and the X-T port 26b will be connected to the main tank line 24b.

Between the open / close control valve 25 and the ports 13a, 13b of the hydraulic cylinder 12, the check valves 27a, 27b with a pilot, the throttle / check valves 28a, 28b, and the stop valves 29a, 29b Is installed.

An emergency closing oil return line 30 is connected between the throttle / check valves 28a and 28b of the opening side hydraulic line 23a and the stop valves 29a and 29b and between the main tank line 24b. The shot off valve 31 is provided in the middle of the emergency closing oil return line 30.

The shot-off valve 31 has an A ↓ T port 31a in the first position, and a two-port two-position solenoid valve in which the shutoff port 31b is installed is used in the second position, and when the power is applied, the solenoid action is performed. The A ↓ T port 31a is connected to the emergency closing oil return line 29, the auxiliary tank line 24c and the main tank line 24b by means of a spring restoring force when the power is cut off. 31b) is connected to the emergency closing oil return line 29 and the main tank line (24b) is installed so that the oil supply and oil return is not made.

The shutoff port 31b of the shot-off valve 31 may be configured in a state in which the port itself is closed, but it is preferable to install bidirectional check valves 31c and 31d for more reliable shutoff.

The above hydraulic circuit portion is provided in parallel to expand the hydraulic pressure control width by using either one or controlling both sides at the same time.

In addition, the open side hydraulic line 23a, the close side hydraulic line 23b, the pump line 24a, and the tank line 24b use conventional relatively small diameter pipes, and the open side hydraulic line 23a and Between the open side port 13a, between the closed side hydraulic line 23b and the closed side port 13b, between the pump line 24a and the intermediate stop valve 26, and between the tank line 24b and the intermediate stop. Between the valve 26, a connecting pipe made of a relatively large diameter pipe having a larger diameter than the opening side hydraulic line 23a and the closing side hydraulic line 23b and the pump line 24a and the tank line 24b ( 23c) 23d, 24c, and 24d are connected to each other so that even when both sides of the hydraulic circuit portion connected in parallel is configured to smoothly supply and return oil for opening and closing drive.

Here, the open side hydraulic line 23a, the close side hydraulic line 23b, the pump line 24a, and the tank line 24b use, for example, 1 / 2-inch pipes, and the connecting pipes 23c and 23d ( 24c) 24d are ones that can use 3/4 inch pipes, for example.

In the drawings, reference numeral 22a is a driving motor for driving the main oil pump 22, 32 is a manual oil pump for manually generating hydraulic pressure when a malfunction of the main oil pump 22 is performed, and 33a and 33b are Each is a check valve, 34 is a pressure gauge and 35 is a manual valve.

Hereinafter, the opening and closing operation of the hydraulically driven butterfly valve according to the present invention.

First, when the closing operation is performed in the control room in the open state as shown in FIG. 1, the power to the on / off control valve 25 and the intermediate stop valve 26, which are solenoid valves, are cut off, and the intermediate control to the on / off control valve 25 is performed. The stop valve 26 is retracted by the restoring force of the spring (moves in the right direction in the drawing) so that the pump line 24a and the closing side hydraulic line 23b are controlled by the port P↗B of the intermediate stop valve 26 and the opening and closing control. In addition to being connected via the port P↗B of the valve 25, the opening side hydraulic line 23a and the main tank line 24b are switched to the state connected via the port A↘T of the open / close control valve 25. Became

The oil pressurized by the oil pump 22 and supplied to the pump line 24a is supplied to the port P↗B of the intermediate stop valve 26, the port P↗B of the on-off control valve 25, and the closing side hydraulic pressure. It is supplied to the closing side port 13b of the hydraulic cylinder 12 through the line 23b to advance the piston rod 12a, and the opening side port 13a of the hydraulic cylinder 12 is introduced in the opening operation process. The existing oil flows out and returns to the oil tank 21 through the opening side hydraulic line 23a, the port A_T of the open / close control valve 25 and the main tank line 24b.

Accordingly, the first link 15 connected to the piston rod 12a of the hydraulic cylinder 12 by the hinge pin 15a rotates in a clockwise direction and descends, and is connected to the first link 15 by the hinge pin 16a. The second link 16 is rotated in the clockwise direction, so that the one side support shaft 2a on which the second link 16 is fixed is rotated in the clockwise direction so that the valve disc 2 is rotated in the clockwise direction. As shown in FIG. 3, it is in a closed state.

When the opening operation is performed in the control room in the closed state as shown in FIG. 3, the intermediate stop valve 26 is maintained in a state where the power is cut off, and power is applied to the on / off control valve 25 to open / close the control valve ( 25 is advanced by the operation of the solenoid (moving in the left direction in the drawing), so that the pump line 24a and the open side hydraulic line 23a are connected to the port P↗B and the open / close control valve 25 of the intermediate stop valve 26. ) And the closed hydraulic line (23b) and the main tank line (24b) are connected through the port (P ↓ B) of the open / close control valve 25 to the oil pump. Opening port of the hydraulic cylinder 12 through the opening side hydraulic line 23a through the port (P ↑ A) of the opening and closing control valve 25 is pressurized by the (22) supplied to the pump line (24a) Supplied to 13a to retract the piston rod 12a (upward movement in the drawing), and close the hydraulic cylinder 12. At the side port 13b, the oil introduced during the closing operation flows out and the oil tank is opened through the port B ↓ T of the heat closing side hydraulic line 23b, the opening / closing control valve 25, and the main tank line 24b. It returns to (21).

Accordingly, the first link 15 connected to the piston rod 12a by the hinge pin 15a is rotated in the counterclockwise direction, and thus the one side support shaft 2 on which the second link 16 is fixed is raised. This counterclockwise rotation causes the valve disc 2 to rotate counterclockwise so as to be opened as shown in FIG.

In addition, when power is applied to the intermediate stop valve 26 in the state in which the above-described opening and closing operation is completed, the intermediate stop valve 26 is advanced by the solenoid action (moves to the left in the figure) and the port P ↑ X is connected to the pump line ( 24a), the ports X ↓ T are switched to the main tank line 24b, respectively, so that oil supplied from the oil pump 22 to the pump line 24a is shut off at the port P ↑ X. , The oil returned to the oil tank 21 from the hydraulic cylinder 12 through the open side hydraulic line 23a or the closed side hydraulic line 23b is blocked at the port X ↓ T and is supplied to the hydraulic cylinder 12. Therefore, the open or closed oil is stagnated to maintain the open or closed state.

At this time, the oil returned from the open side hydraulic line 23a or the closed side hydraulic line 23b reaches the check valves 27a and 27b with pilot through the throttle / check valves 28a and 28b. The oil supplied from (24a) is blocked by the P ↑ X port 26a of the intermediate stop valve 26, so that no hydraulic pressure acts on the pilot line of the check valves 27a and 27b with pilot, so that the hydraulic line on the open side Since the oil returned from the 23a or the closing side hydraulic line 23b is blocked by the pilot check valves 27a and 27b, the intermediate stop action is accurately performed.

On the other hand, when the power is interrupted, the power supply of the on-off control valve 25, which is a solenoid valve, is cut off and automatically switched to the closed operation state, and the power of the shot-off valve 31 is also cut off. The valve 31 switches to a state in which the A ↓ T port 31a corresponds to the emergency closing oil return line 30 by the restoring force of the spring, and checks the oil coming out of the open side hydraulic line 23a with a pilot. A ↓ T port 31a and auxiliary tank line 24c of the emergency return oil return line 30 and the shot-off valve 31 immediately without passing through the valves 27a and 27b and the throttle / check valves 28a and 28b. Return to the oil tank 22 through the main tank line (24b) and the flow of the oil to operate the hydraulic cylinder 12 is made quickly, and as a result the butterfly valve is quickly closed.

On the other hand, if necessary, only one or both of the hydraulic circuits may be used, and when both are used, the connecting pipes 23c, 23d, 24c, and 24d are open side hydraulic lines 23a. Since the over-close side hydraulic line 23b, the pump line 24a, and the tank line 24b have a diameter larger than that of the pipe, the supply and return of the oil for opening / closing and driving is smoothly performed.

As described above, according to the present invention, the hydraulic circuit unit is installed in parallel, and the opening side hydraulic line 23a and the closing side hydraulic line 23b, the pump line 24a, and the tank line 24b have a conventional relatively small diameter. Since the pipe is used, a wider selection range of components such as valves and the like is provided, and design freedom can be increased, and between the open side hydraulic line 23a and the open side port 13a and the close side hydraulic line. The opening side hydraulic line (between the 23b and the closing side port 13b, between the pump line 24a and the intermediate stop valve 26 and between the tank line 24b and the intermediate stop valve 26). 23a) connects the connecting pipes 13c, 13d, 24c and 24d of relatively large diameter pipes larger in diameter than the closing hydraulic line 23b and the pump line 24a and the tank line 24b. Even when both sides of the hydraulic circuit part connected in parallel are used, There is an effect that is made smoothly.

In addition, the present invention has been described as an example of applying the present invention to the butterfly valve, but is not necessarily limited to this, and can be applied to any kind of hydraulically operated valve, such as those skilled in the art and various modifications within the spirit and scope of the present invention You can do it.

Claims (1)

A cylindrical valve body; A hydraulic cylinder for driving the valve; An oil tank for storing the opening and closing driving oil, a main oil pump for compressing the opening and closing driving oil of the oil tank, an opening side hydraulic line connected to the opening side port of the hydraulic cylinder, and a closing side port of the hydraulic cylinder A closed side hydraulic line connected to the main line, a pump line connected to the main oil pump, a tank line connected to the oil tank, the open side hydraulic line, a closed side hydraulic line and the pump line is installed between the tank line In the hydraulic circuit section having valves for selectively connecting the main oil pump to the open side port and the close side port of the hydraulic cylinder, and to control the flow rate of the oil for opening and closing drive, The hydraulic circuit part is installed in parallel, and the open side hydraulic line, the close side hydraulic line, the pump line and the tank line use conventional relatively small diameter pipes, between the open side hydraulic line and the open side port, and are closed. Larger diameters between the open side hydraulic line and the close side hydraulic line, the close side hydraulic line, the pump line and the tank line between the side hydraulic line and the closing port, between the pump line and the intermediate stop valve, and between the tank line and the intermediate stop valve. Hydraulic control device for hydraulic actuated valves, characterized in that the supply and return of oil for opening and closing driving is smoothly performed even when both sides of the hydraulic circuit part connected in parallel are connected by connecting pipes each having a relatively large diameter. .