A level control device for controlling pipe sloshing

Abstract

The application relates to a liquid level control device for controlling pipeline swing, belonging to the technical field of fluid control, which comprises a main valve, an electric regulating needle valve, a floating ball valve, a water inlet main pipeline, a water discharge main pipeline, a water inlet auxiliary pipeline and a water discharge auxiliary pipeline, a diaphragm is arranged in the main valve, the diaphragm divides the main valve into an upper cavity control chamber and a lower cavity control chamber, the water inlet main pipeline and the water discharge main pipeline are communicated with the lower cavity control chamber, the water discharge main pipeline is communicated with a water tank, the water inlet auxiliary pipeline is communicated with the upper cavity control chamber and the water inlet main pipeline, the electric regulating needle valve is installed on the water inlet auxiliary pipeline, the water discharge auxiliary pipeline is communicated with the upper cavity control chamber, the floating ball valve is installed on the water discharge auxiliary pipeline, a floating ball is connected to the floating ball valve, a liquid level sensor is installed in the water tank, and a controller is arranged outside the water tank. The liquid level sensor, the controller and the electric regulating needle valve are introduced, liquid level change is converted into an electric signal and transmitted to the electric regulating needle valve, automatic control of the liquid level is realized, and pipeline swing is reduced.

Description

Technical Field

[0001] This application relates to the field of fluid control technology, and in particular to a liquid level control device for controlling pipe sloshing. Background Technology

[0002] In industrial fluid control systems such as fire pump rooms and water supply pump rooms, when the water tank level approaches the maximum design level, the pipeline system often experiences violent shaking due to the impact of water flow, accompanied by phenomena such as support vibration, and may even cause abnormal engagement of long-distance pipeline interfaces, seriously affecting the stability of the system's pressure bearing and service life.

[0003] Existing technologies often focus on superficial solutions, such as mitigating vibration through mechanical reinforcement methods like adding flexible pipe connections and increasing the density of fixed supports. However, these measures fail to address the root cause of the problem. A systematic technical investigation revealed that the fundamental cause of the pipe swaying lies in a structural defect in the float valve. With traditional float valves, when the liquid level approaches the maximum water level in the tank, the float valve core quickly closes, causing a momentary obstruction of water flow in the pipe. This sudden interruption of water flow creates a water hammer pressure wave that propagates along the pipe, causing severe swaying. This swaying is transmitted through the pipe to the supports, causing abnormal stress and vibration on the supports.

[0004] Regarding the aforementioned technologies, in engineering practice, in order to shorten the equipment commissioning cycle, valve control devices are often adjusted to the maximum working threshold, which exacerbates the water flow impact, causing loose pipe connections and even water leakage. Therefore, it is urgent to design a liquid level control device to control pipe swaying, so as to fundamentally solve the problem of pipe swaying caused by high liquid levels in the water tank. Utility Model Content

[0005] In view of the shortcomings of the existing technology, one of the objectives of this utility model is to provide a liquid level control device for controlling pipeline swaying.

[0006] This application provides a liquid level control device for controlling pipeline sloshing, which adopts the following technical solution:

[0007] A liquid level control device for controlling pipeline sloshing includes a main valve, an electrically adjustable needle valve, a float valve, a main inlet pipe, a main outlet pipe, a secondary inlet pipe, and a secondary outlet pipe. The main valve has a diaphragm that divides it into an upper control chamber and a lower control chamber. The main inlet pipe is connected to the lower control chamber, and the main outlet pipe is also connected to the lower control chamber. The main outlet pipe is located at the end of the main valve furthest from the main inlet pipe, and this end is connected to a water tank. One end of the secondary inlet pipe is connected to the upper control chamber. The end of the main valve is connected to the main inlet pipe. The electric regulating needle valve is installed on the secondary inlet pipe. One end of the secondary drain pipe is connected to the upper control chamber. The float valve is installed on the end of the secondary drain pipe away from the main valve. A float ball is connected to the end of the float valve away from the secondary drain pipe. The float ball is placed in a water tank. A level sensor for detecting the liquid level is installed in the water tank. A controller is provided outside the water tank. The output end of the level sensor is electrically connected to the input end of the controller. The output end of the controller is electrically connected to the control end of the electric regulating needle valve.

[0008] By adopting the above technical solution, the float valve opens and closes in real time with the rise and fall of the water level in the tank, quickly sensing changes in the water level and initially adjusting the water flow discharge state of the upper control chamber. Simultaneously, the water level sensor converts the water level signal into an electrical signal and transmits it to the controller, controlling the opening of the electric regulating needle valve and dynamically adjusting the flow rate in the inlet secondary pipe. This achieves precise control of the pressure in the upper control chamber. The combination of the float valve and the electric regulating needle valve not only controls changes in the water level in a timely manner but also improves the adjustment accuracy. The diaphragm divides the main valve into upper and lower control chambers. The dynamic balance of the pressure difference between the two chambers drives the main valve to open or close. When the water level rises or falls, the gradual opening and closing of the main valve effectively buffers the water flow impact, reducing the water hammer effect in the pipeline caused by sudden valve opening and closing. This reduces the causes of pipeline swaying from the source, ensuring the stable operation of the entire water supply system and significantly improving the operational safety and stability of the pipeline system.

[0009] Preferably, the main valve includes a first valve body, a first valve seat, a first valve stem, and a first valve core. The first valve body is detachably connected to the main water inlet pipe via a flange. The first valve seat is located inside the first valve body. The end of the first valve stem is connected to the first valve core. The diaphragm is fixedly installed in the middle of the first valve stem.

[0010] By adopting the above technical solution, the first valve seat, first valve stem, and first valve core, driven by the pressure difference on both sides of the diaphragm, can achieve precise opening and closing of the main valve and flow control. The diaphragm fixed in the middle of the first valve stem can effectively transmit the pressure changes in the upper control chamber to the first valve core, ensuring that the main valve gradually opens and closes according to the liquid level signal. At the same time, the main valve is detachably connected to the inlet main pipeline via the flange of the first valve body, providing convenience for equipment installation, commissioning, and subsequent maintenance. The main valve can be quickly disassembled and repaired without disassembling the entire pipeline, significantly reducing maintenance costs and time costs.

[0011] Preferably, a lifting lug is welded to the end of the first valve body away from the main water inlet pipe, and the lifting lug is in the shape of a concentric circle.

[0012] By adopting the above technical solution, the lifting lugs make it easy for operators to quickly align the main valve flange interface with the flange interface of the main water inlet pipe, reducing the time spent on manual alignment and significantly improving installation efficiency.

[0013] Preferably, the electric regulating needle valve includes a second valve body, a second valve seat, a second valve stem, a second valve core, a relay, and an electric push rod. The second valve body is detachably connected to the water inlet auxiliary pipe via a flange. The second valve seat is located inside the second valve body. The second valve stem is installed inside the second valve seat. The second valve stem is fixedly connected to the second valve core. The end of the second valve stem away from the second valve core is connected to the electric push rod. The relay is connected to the end of the electric push rod away from the second valve stem.

[0014] By adopting the above technical solution, the second valve seat, second valve stem, and second valve core, driven by the electric actuator and relay, can precisely adjust the valve opening according to the controller's instructions, thereby controlling the water flow in the inlet auxiliary pipe and providing a stable and adjustable pressure input to the upper chamber control chamber. Simultaneously, the relay's drive control of the electric actuator enables the needle valve to quickly respond to signal changes from the level sensor, accurately matching the dynamic adjustment needs of the water tank level. This avoids pressure fluctuations caused by delayed or excessive water flow adjustment, reducing the risk of pipe swaying due to water flow impact from the control end.

[0015] Preferably, the electric adjusting needle valve has a movable chamber located within the second valve body and between the electric push rod and the second valve seat. One end of the second valve rod is connected to the electric push rod, and the end away from the electric push rod passes through the movable chamber and is fixedly connected to the second valve core. A pointer slider is provided in the movable chamber and is fixedly connected to the second valve rod. A strip-shaped observation window is provided on the outer periphery of the second valve body and at a position corresponding to the movable chamber. The surface of the observation window is provided with scale.

[0016] By adopting the above technical solution, the pointer slider in the active chamber moves synchronously with the second valve stem in a linear motion, converting the driving displacement of the electric push rod into an intuitive position indication. Operators can accurately read the valve opening in real time by observing the scale on the observation window without the need for additional instruments.

[0017] Preferably, the second valve body has an annular sealing groove, which is located on the outer periphery of the second valve stem and at the bottom of the movable chamber. An annular sealing ring is provided in the annular sealing groove and is fitted onto the second valve stem.

[0018] By adopting the above technical solution, the dynamic sealing structure formed by the annular sealing groove and the annular sealing ring in the second valve body effectively prevents water from leaking out from the gap between the valve stem and the valve body through the tight fit of the elastic sealing ring to the outer periphery of the second valve stem, ensuring that the water inlet secondary pipe maintains good sealing performance during valve adjustment.

[0019] Preferably, a ball valve for manually adjusting the water flow rate of the drainage secondary pipe is connected to the drainage secondary pipe, and the ball valve is located between the float valve and the upper control chamber.

[0020] By adopting the above technical solution, during normal operation, the ball valve is fully open as a rigid connection passage, ensuring that the opening and closing control of the drainage secondary pipe by the float valve according to the liquid level changes directly affects the pressure of the upper control chamber. When the pipeline experiences excessive swaying, closing the ball valve can artificially prolong the time for the pressure in the upper control chamber to rise, effectively mitigating the water hammer effect caused by the sudden closure of the valve and reducing the causes of pipeline vibration from the control end. When the system response is too slow, opening the ball valve can accelerate the drainage of the upper control chamber, improve the opening and closing efficiency of the main valve, and avoid liquid level control deviation caused by pressure regulation lag.

[0021] Preferably, the main drainage pipe is provided with a buffer elbow at the end near the water tank.

[0022] By adopting the above technical solution, when high-speed water flows into the buffer bend in a straight line, its direction of movement is forced to change with the curvature of the buffer bend. During the turning process, the water flow speed is significantly reduced, and the water flows into the water tank at a low speed. This avoids the direct impact of the straight high-speed water flow on the water tank wall, effectively suppresses the vibration of the water tank caused by the water flow impact and its transmission to the pipeline system. It reduces the mechanical vibration inducement from the water flow end and reduces the risk of swaying of the pipeline system caused by vibration.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The float valve opens and closes in real time with the rise and fall of the water level in the tank, quickly sensing changes in the water level and initially adjusting the water flow discharge state in the upper control chamber. Simultaneously, the water level sensor converts the water level signal into an electrical signal and transmits it to the controller, controlling the opening of the electric regulating needle valve and dynamically adjusting the flow rate in the inlet auxiliary pipe. This achieves precise control of the pressure in the upper control chamber. The combination of the float valve and the electric regulating needle valve not only controls changes in the water level in a timely manner but also improves the adjustment accuracy. The diaphragm divides the main valve into upper and lower control chambers. The dynamic balance of the pressure difference between the two chambers drives the main valve to open or close. When the water level rises or falls, the gradual opening and closing of the main valve effectively buffers the water flow impact, reducing the water hammer effect in the pipeline caused by sudden valve opening and closing. This reduces the causes of pipeline swaying from the source, ensuring the stable operation of the entire water supply system and significantly improving the operational safety and stability of the pipeline system.

[0025] 2. Driven by the pressure difference across the diaphragm, the first valve seat, first valve stem, and first valve core enable precise opening and closing of the main valve and flow control. The diaphragm fixed in the middle of the first valve stem effectively transmits pressure changes in the upper control chamber to the first valve core, ensuring that the main valve gradually opens and closes according to the liquid level signal. Simultaneously, the main valve is detachably connected to the inlet main pipeline via a flange on the first valve body, facilitating equipment installation, commissioning, and subsequent maintenance. The main valve can be quickly disassembled and repaired without completely disassembling the pipeline, significantly reducing maintenance and time costs.

[0026] 3. Driven by the electric actuator and relay, the second valve seat, second valve stem, and second valve core can precisely adjust the valve opening according to the controller's instructions, thereby controlling the water flow in the inlet auxiliary pipe and providing a stable and adjustable pressure input to the upper control chamber. Simultaneously, the relay's drive control of the electric actuator enables the needle valve to quickly respond to changes in the liquid level sensor signal, accurately matching the dynamic adjustment needs of the water tank level. This avoids pressure fluctuations caused by delayed or excessive water flow adjustment, reducing the risk of pipe swaying due to water flow impact from the control end. Attached Figure Description

[0027] Figure 1 This is a structural schematic diagram of an embodiment of this application;

[0028] Figure 2 This is a schematic diagram illustrating the structure of an electrically adjustable needle valve in this embodiment of the application.

[0029] Reference numerals: 1. Water tank; 2. Main valve; 201. First valve body; 202. First valve seat; 203. First valve stem; 204. First valve core; 3. Electric regulating needle valve; 301. Second valve body; 302. Second valve seat; 303. Second valve stem; 304. Second valve core; 305. Relay; 306. Electric push rod; 4. Float valve; 5. Main inlet pipe; 6. Main outlet pipe; 7. Secondary inlet pipe; 8. Secondary outlet pipe; 9. Diaphragm; 10. Upper chamber control chamber; 11. Lower chamber control chamber; 12. Float; 13. Liquid level sensor; 14. Controller; 15. Lifting lug; 16. Movable chamber; 17. Pointer slider; 18. Observation window; 19. Annular sealing groove; 20. Annular sealing ring; 21. Ball valve; 22. Buffer elbow. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 -Appendix Figure 2 This application will be described in further detail.

[0031] This application discloses a liquid level control device for controlling pipeline swaying.

[0032] Reference Figure 1 A liquid level control device for controlling pipeline sloshing includes a main valve 2, an electric regulating needle valve 3, a float valve 4, a main inlet pipe 5, a main outlet pipe 6, a secondary inlet pipe 7, and a secondary outlet pipe 8. The main valve 2 is equipped with a diaphragm 9, which divides the main valve 2 into an upper control chamber 10 and a lower control chamber 11. The main inlet pipe 5 is connected to the lower control chamber 11, and the main outlet pipe 6 is also connected to the lower control chamber 11. The main outlet pipe 6 is located at the end of the main valve 2 furthest from the main inlet pipe 5, and this end is connected to a water tank 1. One end of the secondary inlet pipe 7 is connected to the upper control chamber 10. The end of the valve away from the main valve 2 is connected to the main water inlet pipe 5. The electric regulating needle valve 3 is installed on the secondary water inlet pipe 7. One end of the secondary drain pipe 8 is connected to the upper control chamber 10. The float valve 4 is installed on the end of the secondary drain pipe 8 away from the main valve 2. The end of the float valve 4 away from the secondary drain pipe 8 is connected to a float 12. The float 12 is placed in the water tank 1. A liquid level sensor 13 for detecting the liquid level is installed in the water tank 1. A controller 14 is provided outside the water tank 1. The output end of the liquid level sensor 13 is electrically connected to the input end of the controller 14. The output end of the controller 14 is electrically connected to the control end of the electric regulating needle valve 3.

[0033] As the liquid level in water tank 1 rises, float ball 12 rises synchronously with the liquid level, driving float valve 4 to operate. The drain secondary pipe 8 gradually closes, and the pressure in the upper control chamber 10 gradually increases due to obstructed water flow. Simultaneously, the liquid level sensor 13 in water tank 1 monitors the liquid level in real time and converts the liquid level signal into an electrical signal, which is output to controller 14. This sends a command to electric regulating needle valve 3, causing it to gradually close and reducing the water flow in the inlet secondary pipe 7. This reduces the amount of water entering the upper control chamber 10 through the inlet secondary pipe 7. As the pressure in the upper control chamber 10 continues to rise, a pressure difference forms on both sides of diaphragm 9. When the pressure difference reaches a threshold, it pushes diaphragm 9 to gradually close the main valve 2, cutting off the main inlet pipe 5 from the water tank 1. Water supply: When the water level in tank 1 drops, float ball 12 falls back with the water level, float valve 4 reopens, water flows out of upper control chamber 10 through drain secondary pipe 8, pressure decreases, and at the same time, level sensor 13 sends a signal to controller 14. Controller 14 sends a command to electric regulating needle valve 3, causing electric regulating needle valve 3 to gradually open and increase the water flow in inlet secondary pipe 7. The pressure difference on both sides of diaphragm 9 decreases, main valve 2 reopens, and water supply to tank 1 resumes. This cycle is used to control the water level in tank 1 and reduce pipe swaying.

[0034] Specifically, the main valve 2 includes a first valve body 201, a first valve seat 202, a first valve stem 203 and a first valve core 204. The first valve body 201 is detachably connected to the main water inlet pipe 5 via a flange. The first valve seat 202 is located inside the first valve body 201. The end of the first valve stem 203 is connected to the first valve core 204 to block the first valve seat 202. The diaphragm 9 is fixedly installed in the middle of the first valve stem 203. When the liquid level in water tank 1 rises, the drainage secondary pipe 8 gradually closes. The pressure in the upper control chamber 10 increases due to the obstruction of water flow, creating a pressure difference on both sides of the diaphragm 9. This pressure difference pushes the diaphragm 9 to move the first valve stem 203 axially. The first valve core 204 connected to the end of the first valve stem 203 gradually seals the first valve seat 202, thereby cutting off the water supply from the main inlet pipe 5 to water tank 1. When the liquid level in water tank 1 drops, the float valve 4 opens, the pressure in the upper control chamber 10 decreases, the pressure difference on both sides of the diaphragm 9 decreases, and the first valve stem 203 moves the first valve core 204 away from the first valve seat 202. The first valve seat 202 opens, and the main inlet pipe 5 resumes supplying water to water tank 1.

[0035] The first valve body 201 has a lifting lug 15 welded to the end away from the main water inlet pipe 5. The lifting lug 15 is concentric in shape. When installing the main valve 2, the main valve 2 can be precisely lifted to the flange interface of the main water inlet pipe 5 by suspending a crane sling through the lifting lug 15.

[0036] Reference Figure 2The electric regulating needle valve 3 includes a second valve body 301, a second valve seat 302, a second valve stem 303, a second valve core 304, a relay 305, and an electric push rod 306. The second valve body 301 is detachably connected to the water inlet auxiliary pipe 7 via a flange. The second valve seat 302 is located inside the second valve body 301. The second valve stem 303 is installed inside the second valve seat 302 and is fixedly connected to the second valve core 304. The end of the second valve stem 303 away from the second valve core 304 is connected to the electric push rod 306. The relay 305 is connected to the end of the electric push rod 306 away from the second valve stem 303. When the level sensor 13 detects a rise in the water level of tank 1, it sends a signal to the controller 14, which then sends a control signal to the relay 305. Upon receiving the signal, the relay 305 drives the electric push rod 306 to operate. The electric push rod 306 drives the second valve stem 303 connected to it to move linearly within the second valve seat 302. The second valve core 304, which is fixedly connected to the other end of the second valve stem 303, moves synchronously, gradually reducing the flow area between the second valve core 304 and the second valve seat 302. This reduces the water flow rate in the secondary inlet pipe 7, thereby reducing the amount of water entering the upper control chamber 10 through the secondary inlet pipe 7. When the level sensor 13 detects a drop in the water level of tank 1, it sends the opposite signal to the controller 14, which then sends a control signal to the relay 305. The relay 305 drives the electric push rod 306 to operate in the opposite direction, causing the second valve stem 303 and the second valve core 304 to move in opposite directions, increasing the flow area between the second valve core 304 and the second valve seat 302, and thus increasing the water flow rate in the secondary inlet pipe 7.

[0037] Furthermore, the electric regulating needle valve 3 is provided with a movable chamber 16, which is located inside the second valve body 301 and between the electric push rod 306 and the second valve seat 302. One end of the second valve rod 303 is connected to the electric push rod 306, and the other end away from the electric push rod 306 passes through the movable chamber 16 and is fixedly connected to the second valve core 304. A pointer slider 17 is provided inside the movable chamber 16, and the pointer slider 17 is fixedly connected to the second valve rod 303 to ensure that the pointer slider 17 moves in a straight line synchronously with the second valve rod 303. A strip-shaped observation window 18 is provided on the outer periphery of the second valve body 301 at the position corresponding to the movable chamber 16, and the surface of the observation window 18 is provided with scale. When the level sensor 13 detects a change in the level of the water tank 1, the controller 14 sends a control signal to the relay 305. The relay 305 drives the electric push rod 306 to run. The electric push rod 306 drives the second valve stem 303 to move linearly, which in turn drives the pointer slider 17, which is fixedly connected to the second valve stem 303, to move in the movable chamber 16. The position of the pointer slider 17 is displayed intuitively through the strip-shaped observation window 18 on the outer periphery of the second valve body 301 and the scale on the window surface. The operator can view the opening degree of the electric regulating needle valve 3 in real time through the observation window 18.

[0038] An annular sealing groove 19 is provided inside the second valve body 301. The annular sealing groove 19 is located on the outer periphery of the second valve stem 303 and at the bottom of the movable chamber 16. An annular sealing ring 20 is provided in the annular sealing groove 19. The annular sealing ring 20 is sleeved on the second valve stem 303 to form a dynamic sealing structure, which is used to prevent water from leaking out from the gap between the second valve stem 303 and the second valve body 301.

[0039] Reference Figure 1 A ball valve 21 for manually adjusting the water flow rate of the secondary drainage pipe 8 is connected to the secondary drainage pipe 8. The ball valve 21 is located between the float valve 4 and the upper control chamber 10. When there is no sloshing in the pipe, the ball valve 21 is fully open, and the secondary drainage pipe 8 forms an unobstructed passage. The float valve 4 automatically opens and closes according to the liquid level in the water tank 1. The ball valve 21 does not participate in the water flow control, but only serves as a rigid connection passage between the float valve 4 and the upper control chamber 10, ensuring that the opening and closing action of the float valve 4 directly affects the pressure in the upper control chamber 10. When there is excessive sloshing in the pipe, the ball valve 21 is closed to prolong the pressure rise time in the upper control chamber 10 and slow down the closing speed of the main valve 2. If the system response is too slow, the ball valve 21 is opened to accelerate the drainage of the upper control chamber 10 and improve the opening and closing efficiency of the main valve 2.

[0040] A buffer bend 22 is provided at one end of the main drainage pipe 6 near the water tank 1 to reduce the impact of water flow on the water tank 1. High-speed water flow enters the buffer bend 22 in a straight direction from the main drainage pipe 6. The water flow changes direction along the curved path within the buffer bend 22, and the water flow enters the water tank 1 at a lower speed, avoiding direct impact on the wall of the water tank 1 and preventing the vibration of the water tank 1 caused by the water flow impact from being transmitted to the pipeline system.

[0041] The implementation principle of this application embodiment is as follows:

[0042] When the liquid level in water tank 1 begins to rise, the float ball 12 placed in water tank 1 rises synchronously with the liquid level. The rise of the float ball 12 drives the connected float valve 4 to operate, causing the drain secondary pipe 8 connected to the upper chamber control chamber 10 to gradually close. The closure of the drain secondary pipe 8 obstructs the water flow out of the upper chamber control chamber 10, and its internal pressure gradually increases. At the same time, the liquid level sensor 13 installed in water tank 1 monitors the rise in liquid level in real time and converts the liquid level height signal into an electrical signal and transmits it to the controller 14. After receiving the liquid level rise signal, the controller 14 sends a control command to the electric regulating needle valve 3 installed on the water inlet secondary pipe 7. The electric regulating needle valve 3 begins to gradually close its opening according to the command, reducing the water flow into the upper chamber control chamber 10 through the water inlet secondary pipe 7. As the water flow in the inlet secondary pipe 7 decreases and the drain secondary pipe 8 is completely closed, the pressure in the upper control chamber 10 continues to rise, creating a downward pressure difference on both sides of the diaphragm 9 of the main valve 2. The diaphragm 9 is pushed downward, and this downward movement causes the first valve stem 203 fixed to it to move axially. This causes the first valve core 204 connected to the end of the first valve stem 203 to gradually press against and seal the first valve seat 202. The main valve 2 thus gradually closes, ultimately cutting off the water supply from the main inlet pipe 5 to the water tank 1 and preventing the liquid level from rising further.

[0043] When the liquid level in water tank 1 begins to drop, float ball 12 falls back synchronously with the liquid level. The falling of float ball 12 causes float valve 4 to reopen, allowing the water in the upper control chamber 10 to be smoothly discharged through the drain auxiliary pipe 8. The drainage of the upper control chamber 10 causes its internal pressure to drop rapidly, and the pressure difference across diaphragm 9 decreases accordingly. At the same time, liquid level sensor 13 detects the liquid level drop signal and transmits it to controller 14. After receiving the liquid level drop signal, controller 14 sends a reverse control command to electric regulating needle valve 3. Electric regulating needle valve 3 gradually opens according to the command, increasing the water flow into upper control chamber 10 through inlet auxiliary pipe 7. As the pressure in upper control chamber 10 decreases and the water flow increases, the pressure difference across diaphragm 9 further decreases, and diaphragm 9 moves upward, causing the first valve stem 203 and first valve core 204 to move away from the first valve seat 202. The main valve 2 thus reopens, and the main inlet pipe 5 resumes supplying water to water tank 1, causing the liquid level to rise again.

[0044] Automatic control of the water level in tank 1 is achieved through a cyclical process in which the main valve 2 is closed to stop water supply when the water level rises and opened to resume water supply when the water level falls. During this process, the operation of the float valve 4 and the precise electrical control of the electric regulating needle valve 3 are combined to adjust the rate of pressure change in the upper control chamber 10, making the opening and closing of the main valve 2 smoother and more stable, effectively reducing pipe swaying caused by rapid valve opening and closing or water flow impact.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A liquid level control device for controlling pipeline sloshing, characterized in that, The system includes a main valve (2), an electric regulating needle valve (3), a float valve (4), a main inlet pipe (5), a main outlet pipe (6), a secondary inlet pipe (7), and a secondary outlet pipe (8). The main valve (2) is equipped with a diaphragm (9), which divides the main valve (2) into an upper control chamber (10) and a lower control chamber (11). The main inlet pipe (5) is connected to the lower control chamber (11), and the main outlet pipe (6) is connected to the lower control chamber (11). The main outlet pipe (6) is located at the end of the main valve (2) away from the main inlet pipe (5). The end of the main outlet pipe (6) away from the main valve (2) is connected to the water tank (1). One end of the secondary inlet pipe (7) is connected to the upper control chamber (10), and it is located away from the main inlet pipe (5). One end of valve (2) is connected to the main water inlet pipe (5). The electric regulating needle valve (3) is installed on the secondary water inlet pipe (7). One end of the secondary drain pipe (8) is connected to the upper chamber control chamber (10). The float valve (4) is installed at the end of the secondary drain pipe (8) away from the main valve (2). The end of the float valve (4) away from the secondary drain pipe (8) is connected to a float (12). The float (12) is placed in the water tank (1). A liquid level sensor (13) for detecting the liquid level is installed in the water tank (1). A controller (14) is provided outside the water tank (1). The output end of the liquid level sensor (13) is electrically connected to the input end of the controller (14). The output end of the controller (14) is electrically connected to the control end of the electric regulating needle valve (3).

2. The liquid level control device for controlling pipeline sloshing according to claim 1, characterized in that, The main valve (2) includes a first valve body (201), a first valve seat (202), a first valve stem (203), and a first valve core (204). The first valve body (201) is detachably connected to the main water inlet pipe (5) via a flange. The first valve seat (202) is located inside the first valve body (201). The end of the first valve stem (203) is connected to the first valve core (204). The diaphragm (9) is fixedly installed in the middle of the first valve stem (203).

3. The liquid level control device for controlling pipeline sloshing according to claim 2, characterized in that, The first valve body (201) has a lifting lug (15) welded to the end away from the main water inlet pipe (5), and the lifting lug (15) is in the shape of a concentric circle.

4. The liquid level control device for controlling pipeline sloshing according to claim 1, characterized in that, The electric regulating needle valve (3) includes a second valve body (301), a second valve seat (302), a second valve stem (303), a second valve core (304), a relay (305), and an electric push rod (306). The second valve body (301) is detachably connected to the water inlet auxiliary pipe (7) via a flange. The second valve seat (302) is located inside the second valve body (301). The second valve stem (303) is installed inside the second valve seat (302). The second valve stem (303) is fixedly connected to the second valve core (304). The end of the second valve stem (303) away from the second valve core (304) is connected to the electric push rod (306). The relay (305) is connected to the end of the electric push rod (306) away from the second valve stem (303).

5. The liquid level control device for controlling pipeline sloshing according to claim 4, characterized in that, The electric regulating needle valve (3) is provided with a movable chamber (16), which is located inside the second valve body (301) and between the electric push rod (306) and the second valve seat (302). One end of the second valve rod (303) is connected to the electric push rod (306), and the other end of the second valve rod (303) away from the electric push rod (306) passes through the movable chamber (16) and is fixedly connected to the second valve core (304). A pointer slider (17) is provided inside the movable chamber (16), and the pointer slider (17) is fixedly connected to the second valve rod (303). A strip-shaped observation window (18) is provided on the outer periphery of the second valve body (301) at a position corresponding to the movable chamber (16), and the surface of the observation window (18) is provided with a scale.

6. The liquid level control device for controlling pipeline sloshing according to claim 5, characterized in that, The second valve body (301) has an annular sealing groove (19) inside. The annular sealing groove (19) is located on the outer periphery of the second valve stem (303) and at the bottom of the movable chamber (16). An annular sealing ring (20) is provided in the annular sealing groove (19) and is sleeved on the second valve stem (303).

7. The liquid level control device for controlling pipeline sloshing according to claim 1, characterized in that, A ball valve (21) for manually adjusting the water flow of the drainage secondary pipe (8) is connected to the drainage secondary pipe (8). The ball valve (21) is located between the float valve (4) and the upper control chamber (10).

8. The liquid level control device for controlling pipeline sloshing according to claim 1, characterized in that, The main drainage pipe (6) is equipped with a buffer elbow (22) at one end near the water tank (1).

Images