KR101235563B1 - An Apparatus For Controlling Valve Using Pipeline Pressure - Google Patents

Abstract

The present invention relates to a flow rate control check valve control device using a pipeline pressure, the first branch pipe branched from the pipeline of the check valve inlet side, the second branch pipe branched from the pipeline of the check valve outlet side, the first A differential pressure generating unit for comparing the first pressure applied from the branch pipe and the second pressure applied from the second branch pipe, and outputting a differential pressure between the first pressure and the second pressure, driven by the differential pressure, and the differential pressure Correspondingly characterized in that it comprises a check valve actuator for controlling the opening and closing degree of the check valve and the operating speed of the check valve and a control unit for selectively controlling the pressure input to the differential pressure generating unit.
According to the present invention as described above, by using a small amount of electric power to drive the solenoid valve, as well as the opening and closing operation of the check valve is possible to control the flow rate can significantly reduce the power consumed when driving the flow control check valve It works.

Description

An Apparatus For Controlling Valve Using Pipeline Pressure

The present invention relates to a check valve control device using a pipeline pressure, and more particularly, by controlling the minute speed of the opening and closing plate using the pressure difference between the front and rear ends of the flow control check valve to open and close the rapid check valve at a minimum power. It also relates to a technique for enabling flow control.

In general, the water pipe is attached to the check valve and the flow control valve at the rear end of the pressure pump to supply the flow rate. Recently, a flow control check valve with both functions is used.

The flow control check valve should basically have two response speeds. Firstly the ability to shut off the check valve rapidly in an emergency to perform a check function. In other words, in case of rapid operation function and second flow rate control, fine speed control is necessary for precise control. The speed difference between these two functions is so large that a typical electric check valve actuator using a constant speed AC induction motor is not applicable. Therefore, the hydraulic system with the quick response speed of the check valve opening and closing and the speed control is the most suitable system. The hydraulic system requires the pump to supply the flow rate and the possibility depends on the capacity of the pump. At this time, the motor for driving the pump is a speed control motor.

Such a hydraulic control method has a disadvantage of high manufacturing cost and high power consumption, and the applicant has been registered in Korean Patent No. 10-740544 with a check valve system that operates an actuator using a pressure at the fluid inlet side. 1 shows a schematic diagram of the structure of a check valve system according to a registered patent.

As shown in FIG. 1, the conventional check valve system opens and closes the inlet side and the outlet side to be closed and communicated with each other, and the hinged opening / closing plate 10 and the opening / closing plate rotating member 20 for rotating the opening / closing plate 10. And an actuator 40 for rotating the opening and closing plate rotating member 20 by the pressure of the fluid supplied from the branch pipe 30 and the branch pipe 30 branched to a predetermined portion on the inlet side.

 The branch pipe 30 branches to a predetermined portion on the inlet side and supplies fluid to the actuator 40. An open / close valve 31 is installed between the branch pipe 30 and the actuator 40 to supply fluid to the actuator 40. Control supply and interruption electrically or mechanically.

In addition, the pressure sensor 32 is further provided on the branch pipe 30 so that the on-off valve 31 is opened when the pressure exceeds a predetermined level.

 Actuator 40 is coupled to the opening and closing plate rotating member 20 to raise the opening and closing plate rotating member 20 by the pressure of the fluid supplied from the branch pipe 30 serves to communicate the inlet side and the discharge side with each other. Thus, the opening and closing of the opening and closing plate 10 is made by the actuator 40 operated by the pressure of the fluid supplied from the inlet side can maintain the opening degree 100%.

 When controlling the opening and closing of the opening and closing plate 10 using the pipe pressure as in the registered patent, the flow rate used in the check valve actuator is extremely small compared to the flow rate through the pipe, so the flow rate of the pipe pressure is momentarily pushed into the actuator. As a result, a very fast response speed can be obtained, and thus an emergency quick operation function can be easily achieved.

However, the registered patent has the advantage that the instantaneous check valve opening and closing operation is very easy, there is a disadvantage that the flow control operation is not easy. That is, when suddenly opening or closing the check valve, a pressure pulsation is generated on the downstream side and propagates upstream, thus preventing the flow of the flow rate.

Therefore, in order to control the flow rate, the control of the check valve through fine speed control is required, and a situation for this technology is urgently required.

The present invention has been made to solve the above problems, an object of the present invention by using a pressure difference between the inlet side and the outlet side of the flow control check valve to control the rapid speed of the opening and closing plate at a minimum power to check quickly It is to enable flow control as well as opening and closing of the valve.

According to an aspect of the present invention for achieving the above object, in the apparatus for controlling the check valve which is installed in the pipe for supplying the flow rate to prevent the backflow and the flow rate adjustment function, branching in the pipe line on the check valve inlet side Comparing the first branch pipe, the second branch pipe branched from the pipeline of the check valve outlet side, the first pressure applied from the first branch pipe and the second pressure applied from the second branch pipe, A differential pressure generator for outputting a differential pressure between a first pressure and a second pressure, a check valve actuator driven by the differential pressure, and a check valve actuator for controlling the opening / closing degree of the check valve and the operating speed of the check valve in accordance with the differential pressure; Provided is a flow control check valve control device using a pipeline pressure, characterized in that it comprises a control unit for selectively controlling the input pressure do.

Here, the one end is connected to the differential pressure generating unit further includes a reference pressure pipe for providing an absolute pressure, the control unit in the opening and closing control mode of any one of the first pressure or the second pressure and the absolute air pressure to the differential pressure generating unit In the flow rate control mode, the first pressure and the second pressure are controlled to be input to the differential pressure generator.

The first pressure generator and the first pressure, the second pressure, and the absolute air pressure are inputted when the first pressure, the second pressure, and the absolute air pressure are input. It is possible to include a second pressure generating unit for outputting any one of them at a second pressure.

Each of the pressure generators may be connected to the first branch pipe, the second branch pipe, and the reference pressure pipe to control the flow of fluid flowing from the first branch pipe, the second branch pipe, and the reference pressure pipe. It is preferable to include.

In addition, the valve actuator has a structure in which rods of opposed first and second cylinders are interconnected, and the first pressure is input to the head side of the first cylinder and the rod side of the second cylinder, and the second pressure is It is possible to input to the rod side of the first cylinder and the head side of the second cylinder.

In addition, one side of the rod may be coupled to the check valve is coupled to drive the check valve is formed.

The apparatus may further include an auxiliary flow tank connected to the other end of the reference pressure pipe to store the fluid discharged through the reference pressure pipe, and a recovery pump for recovering the fluid stored in the auxiliary flow tank to the pipe at the outlet side of the check valve. desirable.

According to the present invention, by using a small amount of electric power to drive the solenoid valve, not only the opening and closing operation of the check valve but also the flow rate control can significantly reduce the power consumed when driving the flow control check valve. .

1 is a schematic view showing the structure of a check valve system according to Korean Patent No. 10-740544.
Figure 2 is a schematic diagram showing the structure of the flow rate check valve control device using the pipeline pressure.
3 is a block diagram illustrating an internal configuration of a differential pressure generating part of FIG. 2.
Figure 4 is a graph showing the pressure change of the front and rear ends of the check valve according to the check valve opening amount.
5 is a view showing a detailed configuration of the flow rate check valve control apparatus using the pipeline pressure according to an embodiment of the present invention.
6 is a view showing a detailed configuration of the flow rate check valve control apparatus using the pipeline pressure according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Figure 2 is a schematic diagram showing the structure of the flow rate check valve control device using the pipeline pressure.

As shown in Figure 2, the flow rate check valve control apparatus using the pipeline pressure according to the present invention is installed on one side of the pipe 100, such as a water supply pipe for supplying a flow rate, and the pipe 100 to prevent the back flow of fluid To provide a driving pressure to the check valve 200, the open gauge 300 for controlling the open state of the check valve 200, the valve actuator 400 for driving the open meter 300, and the valve actuator 400. Recovery to recover the fluid in the differential pressure generating unit 500, the control unit 600, the secondary flow tank 700 for temporarily storing the fluid discharged from the differential pressure generating unit 500 and the auxiliary flow tank 700 to the pipe 100 It is configured to include a pump (800).

The check valve 200 is installed at the rear end of the pressure pump (not shown) for pumping the fluid in the pipe 100 to pass the fluid pumped by the pressure pump and to prevent the backflow of the fluid when the pressure pump is not operating. For this purpose, in recent years, a flow control check valve having a check flow prevention function of a check valve and a function of a flow control valve is frequently used, and the present invention also uses such a flow control check valve.

The valve actuator 400 is driven by a differential pressure applied from the differential pressure generating unit 500, and controls the opening and closing speed and the operating speed of the check valve 200 in correspondence with the differential pressure.

The differential pressure generating unit 500 drives the valve actuator 400 by using the differential pressure between the inlet side and the outlet side of the check valve 200, and the first branch pipe branched from the conduit of the inlet side of the check valve 200. The reference pressure pipe 130 connected to the second branch pipe 120 and the auxiliary flow tank 700 to be described later is branched from the conduit of the outlet 110 of the check valve 200 and the check valve 200. ) The pressure at the inlet side (first pressure), the pressure at the outlet side (second pressure) and the absolute air pressure at the side of the auxiliary flow tank 700 are input, and at the output stage, the differential pressure between two pressures of the three pressure values is output. And input to the valve actuator 400.

The control unit 600 is a part for controlling any one of the pressure (first, second pressure, absolute barometric pressure) input to the differential pressure generating unit 500 to selectively enter the differential pressure generating unit 500.

3 is a block diagram illustrating an internal configuration of the differential pressure generating unit of FIG. 2, and FIG. 4 is a graph illustrating pressure changes in front and rear ends of the check valve according to the check valve opening amount.

As shown in FIG. 3, the differential pressure generator 500 includes a first pressure generator 510 and a second pressure generator 520.

The first pressure generator 510 and the second pressure generator 520 have the same configuration, but output different output values according to the control signal of the controller 600.

That is, the first pressure generator 510 and the second pressure generator 520 are input from the first pressure (indicated by ① in the drawing) and the second branch pipe 120 that are input from the first branch pipe 110. When the second pressure (indicated by ② in the figure) and the absolute air pressure (indicated by ③ in the figure) input from the reference pressure tube 130 are input, the pressure of any one of them is adjusted according to the selection control signal of the controller 600. Output to the actuator 400.

The control operation of the control unit 600 is largely divided into an opening and closing control mode for controlling the opening and closing of the check valve 200 and a flow rate control mode for controlling the flow rate, which will be described in more detail as follows.

Opening and closing Control mode

The open / close control mode is a mode of rapidly opening or closing the check valve. In the valve opening operation, the first pressure generator 510 selectively outputs only the first pressure or the second pressure based on a control signal of the controller 600. In addition, the second pressure generator 520 selectively outputs only the absolute air pressure, and the valve actuator 400 completely opens the check valve 200 by using the differential pressure between the two pressures.

On the contrary, in the valve closing operation, the first pressure generator 510 selectively outputs the absolute air pressure, and the second pressure generator 520 selectively outputs the first pressure or the second pressure, and the valve actuator 400. Will completely close the check valve 200 by the differential pressure between the two pressures.

flux Control mode

In general, when the check valve is applied, the pressure at the outlet side is much higher than the inlet side of the check valve 200 when the pump is not operating, and the pressure at the outlet side usually has a pressure of 3 to 10 kgf / cm ² . Therefore, when the pump is running, the pressure at the valve inlet must be maintained at approximately 3 to 15 kgf / cm ² . In addition, the pressure on the inlet and outlet sides depends on the opening and closing degree of the valve. The pressure change of the inlet side and the outlet side according to the opening and closing of the valve in the operation of the pump is as shown in FIG.

Referring to FIG. 4, the pressure difference between the inlet side and the outlet side according to the opening and closing degree of the valve has a linear pressure change at 25% and 75% opening due to a sharp drop in pressure at the time of opening the valve as shown in the figure.

Most flow adjustments are made between 25% and 75% openings. Therefore, the linear pressure change is related to the linear speed change.

During flow control, the first pressure generator 510 selectively outputs the first pressure at the valve inlet side and the second pressure generator 520 outputs the second pressure at the valve outlet side to reduce the pressure difference. When the valve actuator 400 operates to correspond to the differential pressure, the opening amount and the opening speed of the check valve 200 are variable.

Forces required to open and close the valve are valve friction and fluid resistance. In order to increase the force required to open and close the valve, the diameter of the cylinder should be increased, but there is a limit to the expansion of the diameter. Therefore, when the pressure difference is controlled to maintain at least 1 kgf / cm ² , the area that can be operated by the pressure difference between the first pressure and the second pressure is controlled. Is between 25% and about 70% open area.

Where the pressure difference is between 1 and 2 kgf / cm ² As a result, there is a speed difference to control the valve. This can be adjusted to reduce the flow rate at a constant rate, which will be described later.

In FIG. 4, when the valve opening is 25% or less or 70% or more, the valve is operated in the open / close control mode.

5 is a view showing a detailed configuration of the flow rate check valve control apparatus using the pipeline pressure according to an embodiment of the present invention.

5 illustrates a detailed structure of the differential pressure generator 500 and the valve actuator 400.

The valve actuator 400 has a structure in which two double-acting cylinders 410 and 420 face each other, and the cylinder rod 460 is integrally formed so that one end of the cylinder rod 460 is the piston 440a in the first cylinder 410. ) And the other end of the cylinder rod 460 is coupled to the piston 440b in the second cylinder 420. A coupling protrusion 470 protrudes from the center of the cylinder rod 460 and is coupled to the open meter 300. In the present embodiment, the open meter 300 is axially coupled to the lower opening and closing plate 350 in the center of the circular rotating body 310, the opening and closing plate 350 when the rotating body 310 is rotated Rotating together will open and close the pipeline.

And, the rotating body 310 is formed to extend the lever 320 downward, the long hole 330 is formed in the lever 320 is coupled to the coupling projection 470 to the long hole 330 of the cylinder rod 460 When the left and right moving lever 320 is rotated in conjunction with the left and right, the circular body 340 is rotated in accordance with the rotation of the lever 320 is made to open and close the check valve 200.

The first and second cylinders 410 and 420 are double acting cylinders having two fluid inlets, and the fluid flowing from the first pressure generator 510 receives the head-side inlet 430a and the second of the first cylinder 410. The fluid flowing into the rod inlet 450b of the cylinder 420 and flowing from the second pressure generator 520 flows into the rod inlet 450a of the first cylinder 410 and the head of the second cylinder 420. It is input to the side inlet 430b.

Accordingly, when the valve opening operation is performed in the open / close control mode, the first pressure (valve inlet side pressure) or the second pressure (valve outlet side pressure) is the head side inlet port 430a of the first cylinder 410 and the second cylinder 420. Is input to the rod side inlet port 450b of the first cylinder 410, and the absolute air pressure is input to the rod side inlet port 450a of the first cylinder 410 and the head side inlet port 450b of the second cylinder 420, the pistons 440a and 440b. ) Is pushed to the right to move the lever 320 to the right.

In the valve closing operation, pressure is applied in the reverse direction of the valve opening operation. Accordingly, a force that pushes the pistons 440a and 440b to the left acts to move the lever 320 to the left.

In the flow control mode, the first pressure is input to the head side inlet 430a of the first cylinder 410 and the rod side inlet 450b of the second cylinder 420, and the second pressure is input to the first cylinder 410. When input to the rod side inlet 450a and the head side inlet 430b of the second cylinder 420, the piston (440a, 440b) is moved to the right as much as the differential pressure to control the flow rate.

The first and second pressure generators 510 and 520 are three solenoid valves 511, 512, and 513 connected to the first branch pipe 110, the second branch pipe 120, and the reference pressure pipe 130, respectively. , 521, 522, and 523. Each solenoid valve is turned on or off by a control signal of the control unit 600 to control the flow of fluid. Only one of the three solenoid valves in each pressure generating unit is turned on to supply the corresponding pressure to the valve actuator 400. To be applied.

The function of stopping the check valve 200 at an arbitrary position is to shut off the power supply of all the solenoid valves so that the fluid inside the cylinder does not flow in an incompressible state so that the check valve 200 is restrained without moving.

Therefore, this valve control system requires a little power to drive the solenoid valve only when the valve is operated, and does not require any power except the sensor, and thus has a very high power saving effect compared to the existing valve actuator. . In addition, since the fluid flowing through the pipe is used as the working fluid, it can be a facility that increases the possibility of blocking the pollutant source by the main pipe caused by other fluids.

6 is a view showing a detailed configuration of the flow rate check valve control apparatus using the pipeline pressure according to another embodiment of the present invention.

According to the embodiment of Figure 5, since the pressure difference between the first pressure and the second pressure occurs up to 2 ~ 1 kgf / cm ² there is a speed difference to control the valve exists to minimize the flow rate can be controlled at a constant speed do.

Therefore, when the small flow rate control valve 900 is installed between the output stages of the first pressure generating unit 510 and the second pressure generating unit 520 as follows, it flows to the first cylinder 410 side or the second cylinder 420 side. It is possible to construct a mechanism that can reduce the pressure between each other without significantly affecting the flow rate. In this case, if the rapid operation occurs, even if the flow control valve is operated slowly, the rapid operation is possible to implement the check function effectively.

In order to regulate the flow rate in the open state above 70%, the differential pressure between the second pressure and the absolute air pressure should be used. In this case, the flow control valve can be completely opened to reduce the pressure difference, but the speed change can not be prevented. Fortunately, the purpose of fine flow control of the entire valve system can be achieved because the behavior of the valve does not significantly affect the flow rate when the valve is almost completely opened.

As shown in the above figure, the purpose of installing the flow control valve is to control the pressure difference without affecting the pipeline where the main flow occurs, and the valve of the motor is forced to move slowly, but in such a case, it does not sufficiently affect the control system of the present invention. Control may be possible without.

Although the present invention has been described in connection with the preferred embodiments mentioned, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims are intended to cover such modifications or changes as fall within the scope of the invention.

100: pipe 110, 120: first and second branch pipe
130: reference pressure pipe 200: check valve
300: open meter 310: rotating body
320: lever 330: long hole
340: axis of rotation 350: opening and closing plate
400: valve actuator 410, 420: cylinder
430a, 430b: head side inlet 440a, 440b: piston
450a, 450b: rod side inlet 460: piston rod
470: coupling protrusion 500: differential pressure generating unit
510: first pressure generating unit 511, 512, 513: solenoid valve
520: second pressure generating unit 521, 522, 523: solenoid valve
600: control unit 700: auxiliary flow tank
800: recovery pump

Claims (7)

In the device for controlling the check valve which is installed in the pipe for supplying the flow rate to prevent the back flow and control the flow rate,
A first branch pipe branched from the pipeline on the check valve inlet side;
A second branch pipe branched from a pipeline on the outlet side of the check valve;
A differential pressure generator for comparing the first pressure applied from the first branch pipe with the second pressure applied from the second branch pipe, and outputting a differential pressure between the first pressure and the second pressure;
A reference pressure pipe having one end connected to the differential pressure generating unit to provide an absolute air pressure;
A check valve actuator driven by the differential pressure and controlling an opening and closing degree of the check valve and an operating speed of the check valve in accordance with the differential pressure; And
A control unit for selectively controlling the pressure input to the differential pressure generating unit,
The controller may be configured to input either the first pressure or the second pressure and the absolute air pressure to the differential pressure generator in the open / close control mode, and to input the first pressure and the second pressure to the differential pressure generator in a flow rate control mode. Flow rate check valve control device using a pipeline pressure characterized in that for controlling.
delete The method of claim 1,
The differential pressure generating unit
A first pressure generator for outputting any one of the first pressure, the second pressure, and the absolute atmospheric pressure as a first pressure; And
And a second pressure generator for outputting any one of the first pressure, the second pressure, and the absolute atmospheric pressure as a second pressure. 2.
The method of claim 3, wherein
Each of the pressure generating units includes a plurality of electromagnetic shutoff valves connected to the first branch pipe, the second branch pipe, and the reference pressure pipe to control the flow of fluid flowing from the first branch pipe, the second branch pipe, and the reference pressure pipe. Flow rate check valve control device using a pipe pressure, characterized in that.
The method of claim 3, wherein
The valve actuator is
A structure in which rods of opposed first and second cylinders are interconnected, wherein the first pressure is input to the head side of the first cylinder and the rod side of the second cylinder, and the second pressure is the rod side of the first cylinder. And a check valve control apparatus using a pipeline pressure, which is input to the head side of the second cylinder.
The method of claim 5, wherein
A coupling part coupled to the check valve is formed at one side of the rod of the first and second cylinders, and the check valve is driven as the rods of the first and second cylinders move left and right. Flow control check valve control device.
The method of claim 1,
An auxiliary flow tank connected to the other end of the reference pressure pipe to store the fluid discharged through the reference pressure pipe; And
And a recovery pump for recovering the fluid stored in the auxiliary flow tank to the pipe at the outlet side of the check valve.

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