KR101363343B1 - Surge protection device for pump control valve - Google Patents

Abstract

The present invention relates to a water hammer arrestor for a pump control valve. The objective of the present invention is to provide a water hammer arrestor for a pump control valve capable of preventing water hammering by sucking in outside air fast in response to the pressure change inside a water pipe and discharging the sucked air slowly to prevent sudden closing of a disk due to a back flow. To do so, the present invention includes: a body which includes a suction port for sucking in air and a flexible exhaust port for discharging air where the opening area of the suction port is greater than the opening area of the flexible exhaust port; a suction valve which is automatically closed to allow inflow of air through the suction port and prevent outflow of air through the suction port; and a exhaust flow control valve which is installed in the flexible exhaust port and controls the amount of air discharged through the flexible exhaust port to the outside of the body. The water hammer arrestor for a pump control valve is connected to the water pipe where a fluid flows to suck in outside air through the suction port when a negative pressure is generated inside the water pipe or to discharge air through the flexible exhaust port when a back flow is generated.

Description

Surge protection device for pump control valve

The present invention relates to a water shock prevention device for a pump control valve, and more particularly, when a negative pressure is formed around the pump control valve due to the normal stop or emergency stop of the pump, the outside air flows into the water supply line, Thereafter, as the reverse flow occurs in the water supply pipe, the water shock prevention device for a pump control valve for preventing the occurrence of water shock by slowly discharging the internal air sucked into the water supply pipe to the outside.

As is well known, the water hammer phenomenon is caused when there is a sudden change in the flow rate of the fluid in flow due to the valve closing the flow path momentarily in the pipeline, through which the fluid flows, or the normal or emergency stop of the running pump. It is a phenomenon that occurs.

More specifically, when driving a stationary pump, suddenly stopping the pump due to a power failure during normal operation, or rapidly changing the opening degree of the valve, the pressure in the water supply line changes rapidly and the pressure increases greatly. This will cause a drop in fluid transients. When the pressure wave reciprocates between the upstream end and the downstream end due to the sudden flow rate change in the pipeline, the pressure in the pipeline falls below the saturated steam pressure of the water according to the pipeline shape, resulting in the formation of vapor cavity, resulting in column separation. Phenomenon occurs. If the pressure in the pipeline is lower than atmospheric pressure, it may cause buckling in the pipeline, and high pressure is generated when the water column separated by the steam cavity recombines, causing the pipeline to be damaged.

Looking at the damage caused by such water hammer, the pump, valves, pipelines and auxiliary facilities are damaged due to the pressure rise, and the pipeline collapses or separates due to pressure rise and drop in the pipeline. May occur and the pipeline may rupture. In addition, due to the periodic pressure fluctuations in the pipeline, it is difficult to accurately control the pressure in the automatic control system, and even the structure may be broken.

Therefore, in order to prevent the damage caused by the water shock phenomenon, the air chamber or surge tank is installed in the water supply line to compensate for the pressure change in the pipe, or the flywheel is installed in the pump to increase the inertia of the pump rotation part so that the flow rate drops rapidly. Various technologies have been developed and used, such as controlling the speed at which the valve closes the flow path, or by installing a pneumatic or hydraulic device in the pump control valve.

However, the method using the air chamber or the surge tank has a problem in that the installation place of the tank is limited and the installation cost increases, and the method using the flywheel requires a very large flywheel depending on the situation, and thus it is impossible to actually apply the method. There is a problem that the application is very limited because of frequent, and finally, the method using a pneumatic or hydraulic device has a problem in that the device structure is complicated and very precise control is required, so manufacturing or configuration is not easy.

Republic of Korea Utility Model Registration No. 002792 (2002.05.30) Republic of Korea Patent Publication 10-2003-0010245 (2003.02.05)

The present invention has been made in view of the above problems, and an object of the present invention is to prevent external closing of the disk by the reverse flow while slowly introducing the outside air in response to the pressure change in the water supply pipe at a high speed. It is to provide a water shock prevention device for a pump control valve to prevent the occurrence of water shock phenomenon.

The present invention to achieve the object as described above and to perform the problem for eliminating the drawbacks of the prior art is provided with an inlet for the inlet of air, and a variable exhaust for the outflow of air, the opening area of the inlet is a variable exhaust A body formed larger than the opening area; An intake valve allowing the inflow of air through the intake port, but closed automatically to prevent the air from flowing out through the intake port; And an exhaust flow rate control valve installed in the variable exhaust port to adjust the flow rate of the air discharged out of the body through the variable exhaust port, and connected to the water supply line through which the fluid flows, and when a negative pressure is formed inside the water supply line, Provides a water shock prevention device for a pump control valve, characterized in that the air is introduced, and discharged in the reverse flow occurs through the variable exhaust.

In another aspect, the present invention provides a water shock prevention device for a pump control valve further includes an exhaust flow rate control valve installed in the variable exhaust port to adjust the flow rate of the air discharged out of the body through the variable exhaust port.

The present invention also provides a water shock prevention device for a pump control valve installed in any one of the pump control valve installed in the water supply pipe, the suction pipe connected to the pump control valve or the discharge pipe connected to the pump control valve.

According to the present invention having the above characteristics, it is not required to use a sensor for detecting a pressure change in the water pipe and an actuator for implementing an operation corresponding to the detected pressure change, so that the structure is simple and compact, thereby limiting the installation place. It is effective in reducing the initial installation cost and maintenance cost.

1 is a cross-sectional view of the water shock prevention device for a pump control valve according to the present invention,
2 is a cross-sectional view showing an example of a check valve that can be used as an intake valve of the present invention;
3 is a cross-sectional view showing an example of a check valve usable as an intake valve in the present invention;
Figure 4 is a cross-sectional view showing a water shock prevention device for a pump control valve installed in the suction side of the pump control valve in the present invention,
5 is a cross-sectional view showing a state in which the water shock prevention device for the pump control valve according to the present invention is installed on the discharge side of the pump control valve,
6 is a cross-sectional view showing a state in which a water shock prevention device for a pump control valve according to the present invention is installed in a suction pipe connected to a pump control valve;
7 is a cross-sectional view showing a state in which a water shock prevention device for a pump control valve according to the present invention is installed in a discharge pipe connected to a pump control valve;
8 is an exemplary view showing a process of suppressing the occurrence of water shock by the water shock prevention device for a pump control valve according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a cross-sectional view of the water shock prevention device for a pump control valve according to the present invention, Figure 2 is a cross-sectional view showing an example of the check valve that can be used as the intake valve of the present invention, Figure 3 is available as an intake valve in the present invention Figure 4 is a cross-sectional view showing an example of the check valve, Figure 4 is a cross-sectional view showing a state in which the water shock prevention device for a pump control valve is installed on the suction side of the pump control valve in the present invention, Figure 5 is a number for the pump control valve according to the present invention 6 is a cross-sectional view showing a state in which the impact preventing device is installed on the discharge side of the pump control valve, Figure 6 is a cross-sectional view showing a state in which the water shock prevention device for the pump control valve according to the present invention is installed in the suction pipe connected to the pump control valve, Figure 7 The cross-sectional view showing a state in which the water shock prevention device for the pump control valve according to the present invention is installed in the discharge pipe connected to the pump control valve.

Water shock prevention device 100 for a pump control valve according to the present invention is to prevent the occurrence of water shock while introducing and discharging the outside air according to the pressure change in the water pipe, the body 110 and the intake valve 120 It is composed of

The body 110 is an inlet valve is opened when the negative pressure is formed in the water supply passage and the outside air is introduced, when the reverse flow occurs to let the introduced air is gradually discharged to the outside, the inlet for the flow of air ( 111 and the variable exhaust port 112 are formed.

On the other hand, the intake port 111 is formed at the upper end of the body 110 to form a passage through which the outside air flows into the interior of the body 110, the variable exhaust port 112 is a water pipe and the air inside the body 110 It is formed on the side of the body 110 to discharge the outside.

As such, in forming the intake port 111 and the variable exhaust port 112 in the body 110, the inlet port 111 has a larger opening area so that a larger amount of air can flow in a unit time than the variable exhaust port 112. Is formed. In other words, the opening area of the inlet port 111 is larger than the opening area of the variable exhaust port 112. According to such a structure, when negative pressure is formed in the water line, external air can be introduced rapidly, while internal flow can be gradually discharged when reverse flow occurs.

On the other hand, the exhaust flow rate control valve 130 to allow the manager to adjust the amount of air discharged to the outside of the body 110 through the variable exhaust port 112 may be further installed in the variable exhaust port 112, such Exhaust flow control valve 130 may be composed of a known throttle valve.

The lower end of the body 110 configured as described above is provided with a flange 113 for connection with the water supply pipe or the pump control valve 140.

The intake valve 120 is installed in the body 110 to check the intake port 111 to allow the inflow of air through the intake port 111, and to prevent the outflow of air through the intake port 111. The intake valve 120 may be configured as a known check valve in which the valve seat 122 elastically supported by the spring 121 checks the intake port 111 according to the pressure change in the body 110.

For reference, FIG. 1 illustrates an intake valve 120 using a check valve in which the valve seat 122 descends and the inlet 111 is opened when the pressure inside the body 110 decreases, and FIG. An intake valve using a check valve of a method in which both valve seats 122a rotate around the rotation shaft S1 provided at the center of the valve 111 and checks the intake port 111 is illustrated. An intake valve using a check valve of a method in which the valve seat 122b rotates around the rotation shaft S2 provided on one side and checks the intake port 111 is illustrated.

Meanwhile, reference numeral 122c of FIGS. 2 and 3 is a spring for automatically closing the inlet port 111 of the valve seats 122a and 122b when the matching condition is terminated.

Water shock prevention device for a pump control valve of the present invention composed of the body 110 and the intake valve 120 as described above is installed directly in the water supply pipe, or in the pump control valve 140 installed in the water supply pipe to check the flow path of the water supply pipe. It may be installed may be connected to the water supply line through the pump control valve 140.

As such, when installing the water shock prevention device 100 for the pump control valve in the water supply line or the pump control valve 140, the air flow is allowed, but the air valve 150 to prevent water from flowing out to the pump control It is installed between the water shock prevention device 100 for the valve and the water pipe, or between the water shock prevention device 100 for the pump control valve and the pump control valve 140.

For reference, the above-mentioned air valve 150 allows the inflow and outflow of air, but when water rises into the inside of the valve, the float floats by the water and gradually closes the passage through which air flows, so that the water flows out As a valve for preventing the valve, such a valve is disclosed in Korean Patent Laid-Open Publication No. 10-2011-0035386, so that a detailed description of the configuration will be omitted.

On the other hand, when the water shock prevention device 100 for the pump control valve is installed in the pump control valve 140, the water shock prevention device for the pump control valve is based on the disk 141 provided in the pump control valve 140 It is installed to be located on the suction side or the discharge side.

For example, the method of configuring the water shock prevention device for the pump control valve on the suction side of the pump control valve 140 as in the former is applied to the water supply line through which the fluid discharged from the vertical pump flows, such as a drainage pumping station. The method of configuring the water shock prevention device for the pump control valve on the discharge side of the control valve 140 is applied to the water supply line through which the fluid discharged from the pressure pump flows, such as a pressure pumping station.

In the case of the water supply pipe in which the fluid discharged from the vertical pump flows, a vacuum is generated on the suction side of the pump control valve 140 when the operation of the vertical pump is stopped. In order to prevent the occurrence of vacuum and to control the exhaust speed during the exhaust, in the case of the water supply line in which the fluid discharged from the pressure pump flows, when the pump control valve 140 is suddenly closed when the operation of the pressure pump is emergency stop This is because a water shock phenomenon occurs on the discharge side.

As such, in forming the water shock prevention device in the pump control valve 140, the water shock prevention device for the pump control valve is configured on the suction side or the discharge side of the pump control valve 140 in consideration of the type of pump applied to the water supply line. do.

Of course, the water shock prevention device 100 for the pump control valve 100 according to the present invention may be installed in the suction pipe 11 or the discharge pipe 12 connected to the pump control valve 140 (see FIGS. 6 and 7).

8 is an exemplary view showing a process of suppressing the occurrence of water shock by the water shock prevention device for a pump control valve according to the present invention.

The water shock prevention device for a pump control valve of the present invention configured as described above has no effect on the flow of the fluid when the fluid normally flows inside the water supply line (see FIG. 8A).

On the other hand, when the driving pump is emergency stop and the flow path of the water supply line is blocked by the pump control valve 140, the pump control as the fluid flows in the traveling direction or the reverse direction by the inertia of the fluid flowing inside the water supply line. A negative pressure is formed on the discharge side or the suction side of the valve 140.

In the following description, it is assumed that a negative pressure is formed on the discharge side of the pump control valve 140, and the process of suppressing the occurrence of the water shock phenomenon by the water shock prevention device for the pump control valve under such assumption will be described.

When the negative pressure is formed on the discharge side of the pump control valve 140, since the negative pressure is also formed in the body 110 of the water shock prevention device for the pump control valve, the pressure difference between the inside and the outside of the body 110 eventually. As the intake valve 120 is opened, external air is rapidly introduced into the body 110 through the intake port 111. Of course, since the variable exhaust port 112 is also open, external air can be introduced through the variable exhaust port 112.

The suction of the outside air is made until the pressure difference between the inside and the outside of the body 110 disappears, that is, until the negative pressure of the water supply line 10 disappears (see FIG. 8B).

On the other hand, if the fluid flows back toward the disk 141 after the inertia of the fluid in the pump discharge direction disappears, the air introduced into the water pipe 10 should be discharged out of the system by the reverse flow, at this time by the spring The intake valve 120 closes the intake port 111, and the air inside the body 110 is discharged to the outside through the variable exhaust port 112, and the discharge of the air is relatively smaller than the intake port 111. Due to the variable exhaust (112) having a gradually made. Of course, by using the exhaust flow rate control valve 130 is installed in the variable exhaust port 112 it is possible to adjust the speed at which the air is discharged.

As such, the air introduced into the water supply pipe 10 is buffered while gradually being discharged to the outside through the variable exhaust pipe 112 at a suitable flow rate, thereby preventing the closing of the valve due to the reverse flow, thereby causing a water shock phenomenon. Will be suppressed.

As such, when the negative pressure is formed inside the water pipe, the present invention rapidly introduces external air, and when the internal pressure of the water pipe rises again, the structure prevents occurrence of water shock by gradually discharging the air. Since it has a bar, a separate sensor or actuator is not required, the structure is simple, compact, there is no restriction in the installation space, there is an advantage that the maintenance is easy because no separate control is required.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Description of the Related Art
110: Body
111: intake vent
112: variable exhaust
120: intake valve
130: exhaust flow control valve
140: pump control valve

Claims (3)

A body 110 having an intake port 111 for inflow of air and a variable exhaust port 112 for outflow of air, the opening area of the inlet port 111 being larger than the opening area of the variable exhaust port 112; And
An intake valve 120 allowing the inflow of air through the intake port 111 but automatically closing to prevent the air from flowing out through the intake port 111; And
Is installed in the variable exhaust port 112 is composed of an exhaust flow rate control valve 130 for adjusting the flow rate of the air discharged out of the body 110 through the variable exhaust port 112,
When a negative pressure is formed inside the water supply pipe line through which the fluid flows, the external air flows through the intake port 111 and discharges the air introduced through the variable exhaust pipe 112 when the reverse flow occurs. Water shock prevention device. delete The method according to claim 1,
The water shock prevention device for the pump control valve is one of the pump control valve 140 installed in the water supply pipe or the suction pipe 11 connected to the pump control valve 140 or the discharge pipe 12 connected to the pump control valve 140. Water shock prevention device for a pump control valve, characterized in that installed in any one pipe.

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