A water pump anti-siphon device

Abstract

This invention relates to the field of fluid transport control technology and discloses a water pump anti-siphon device. The device includes an inverted U-shaped main pipeline, with a through-wall pump installed at the input end of the pipeline. A multi-functional valve is installed on the pipeline, including a vacuum tank. The vacuum tank's bottom sealing flange is fixedly installed on the top of the inverted U-shaped main pipeline, and a main cavity is provided inside the vacuum tank. This anti-siphon device eliminates the need for a high-power motor and large-size impeller for the through-wall pump under low head and high flow conditions, reducing equipment procurement and operating costs. It employs an oil-lubricated rotary vane vacuum pump to create a vacuum, and automatically detects the liquid level and controls the vacuum pump's start and stop using a level sensor and float switch. This allows the medium to smoothly pass over the highest point of the inverted U-shaped pipeline, thus enabling a small-power pump to meet start-up and normal operation requirements, avoiding energy waste and equipment redundancy caused by using a large motor for a small load.

Description

Technical Field

[0001] This invention relates to the field of fluid transport control technology, specifically to a water pump anti-siphon device. Background Technology

[0002] In low-head, high-flow-rate water supply and drainage systems, such as those for urban water circulation in tourist cities, through-wall pumps are often installed across walls using inverted U-shaped pipes due to site construction limitations. This installation method does not require underwater drilling and can be modified without interrupting water supply, but the high points of the pipes are prone to siphon effect, which places special requirements on the protection of the pump unit during startup and shutdown.

[0003] Existing inverted U-shaped pipe through-wall pump systems generally have certain shortcomings. First, the vacuum pumping process uses a water ring vacuum pump, which requires an additional cooling water source and relies on manual shutdown. If the operation is not timely, foreign objects in the sewage can easily enter the vacuum pump and vacuum pipeline, causing equipment blockage and damage. This results in high maintenance costs and poor operational stability.

[0004] Secondly, to prevent siphon backflow during shutdown, a flap valve must be installed at the outlet. This not only increases equipment procurement costs, but also requires the pump unit to continuously consume power to open the flap valve during operation, resulting in a significant increase in pipe losses and energy consumption. In addition, the flap valve structure is concealed and inconvenient for inspection and monitoring, leading to low overall system safety and reliability. Furthermore, the inverted U-shaped pipeline has a high starting and climbing head, requiring the use of high-power motors and large-size impellers in conventional configurations. During normal operation, excessive flow is prone to occur, necessitating the addition of a frequency converter for regulation, further increasing the system cost.

[0005] In view of this, we propose a water pump anti-siphon device. Summary of the Invention

[0006] The purpose of this invention is to provide a water pump anti-siphon device to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A water pump anti-siphon device includes an inverted U-shaped main pipeline, a wall-penetrating pump is installed at the input end of the inverted U-shaped main pipeline, a multi-functional valve is installed on the inverted U-shaped main pipeline, the multi-functional valve includes a vacuum tank, the bottom sealing flange of the vacuum tank is fixedly installed on the top of the inverted U-shaped main pipeline, and a main cavity is provided inside the vacuum tank;

[0009] The fixed end of a float switch and a liquid level sensor are fixedly installed inside the side wall of the vacuum tank. The float switch is located above the liquid level sensor. The movable end of the float switch and the sensing end of the liquid level sensor both extend into the main cavity. The float switch and the liquid level sensor are both used to detect the liquid level in the main cavity.

[0010] The inner wall of the vacuum tank is rotatably mounted with a rotating shaft via a sealed bearing, and a swinging component is provided on the rotating shaft;

[0011] The inner wall of the vacuum tank is provided with a through vent hole, which is connected to the inverted U-shaped main pipeline and the interior of the main cavity. A tank cover is fixedly installed at the end of the vacuum tank away from the inverted U-shaped main pipeline.

[0012] A vacuum pump is connected to the side wall of the vacuum tank via a vacuum pipeline. A first manual valve is installed on the vacuum pipeline. A silencer is also fixedly installed on the side wall of the vacuum tank, and a second manual valve is installed on the silencer.

[0013] In a further embodiment, the vacuum pump is an oil-lubricated rotary vane vacuum pump.

[0014] In a further embodiment, the swing assembly includes a swing arm, one end of which is fixedly mounted outside the rotating shaft, and the other end of which is fixedly mounted with a fixing plate located inside the inverted U-shaped main pipeline. The end of the swing arm away from the fixing plate has an integrally formed protrusion for selectively blocking the vent, and a protruding rod is fixedly mounted outside the protrusion.

[0015] In a further embodiment, a limiting plate is fixedly installed on the inner wall of the vacuum tank. The limiting plate has a limiting hole, and the protruding rod passes through the limiting hole to limit the rotation range of the swing arm.

[0016] In a further embodiment, a rubber component is fixedly provided around the vent, and the protrusion seals the vent by pressing against the rubber component.

[0017] In a further embodiment, a transparent observation cover is fixedly installed on the side wall of the vacuum tank via a sealing flange, for manual observation of the state of the medium inside the vacuum tank.

[0018] In a further embodiment, a filter screen is fitted inside the input end of the muffler to prevent external impurities from being sucked into the vacuum tank during the siphon destruction process.

[0019] In a further embodiment, a pressure sensor is fixedly mounted on the protrusion, and the movement trajectory of the pressure sensor intersects with the rubber component to monitor the sealing pressure between the protrusion and the rubber component.

[0020] In a further embodiment, the inverted U-shaped main pipeline is fixedly installed at the target location using a support frame.

[0021] In a further embodiment, the through-wall pump, float switch, level sensor, pressure sensor, and vacuum pump are all electrically connected to the controller.

[0022] Compared with the prior art, the present invention provides a water pump anti-siphon device, which has the following beneficial effects:

[0023] 1. This anti-siphon device for water pumps eliminates the need for high-power motors and large-size impellers in low head and high flow conditions, reducing equipment procurement and operating costs. It employs an oil-lubricated rotary vane vacuum pump to create a vacuum, along with a liquid level sensor and float switch to automatically detect the liquid level and control the start and stop of the vacuum pump. This allows the medium to smoothly pass over the highest point of the inverted U-shaped pipeline, thus enabling a small-power pump to meet the start-up and normal operation requirements and avoiding energy waste and equipment redundancy caused by "using a large motor for a small load".

[0024] 2. This anti-siphon device for the water pump eliminates the backflow of the medium due to siphoning when the pump stops or malfunctions. It eliminates the need for a flap gate at the outlet to save costs and power consumption. The device consists of a swing assembly composed of a swing rod, a fixed plate, a protrusion, a protruding rod, and a limiting plate. When the water flow is reversed, the assembly automatically rotates and opens the vent hole by the thrust of the water flow and its own weight. This quickly introduces air to break the siphon, block the backflow of the medium, and saves the purchase cost of a flap gate and the additional power consumption of opening the flap gate when starting the pump.

[0025] 3. This anti-siphon device for water pumps is designed to prevent the vacuum pump and vacuum pipeline from being blocked by sewage impurities, thereby improving system reliability and service life. It uses a vacuum tank to isolate the medium and sensors to automatically control the vacuum pump to stop in time. At the same time, a filter screen is installed in the silencer to block external impurities, thus preventing foreign objects from entering the vacuum pump and pipeline, reducing equipment failure and maintenance frequency, and ensuring long-term stability of the vacuuming and siphoning functions. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the inverted U-shaped main pipeline cross-section of the present invention;

[0028] Figure 3 This is a first-state cross-sectional view of the multifunctional valve and part of its structure of the present invention;

[0029] Figure 4 This is a cross-sectional schematic diagram of the multifunctional valve and part of the structure of the present invention in a second state.

[0030] Figure 5 This is a cross-sectional view of the multifunctional valve and part of the structure of the present invention in a third state.

[0031] Figure 6 This is a schematic diagram of the inverted U-shaped main pipeline cross-section from another perspective of the present invention;

[0032] Figure 7 This is a cross-sectional view of the multifunctional valve and part of the structure of the present invention in the fourth state.

[0033] Figure 8 For the present invention Figure 7 Enlarged structural diagram of region A in the middle;

[0034] Figure 9 This is a schematic diagram of the prior art structure described in this invention.

[0035] Explanation of icon numbers:

[0036] 1. Inverted U-shaped main pipeline; 11. Through-wall pump; 12. Support frame; 2. Multifunctional valve; 21. Vacuum tank; 211. Main cavity; 212. Rotating shaft; 221. Float switch; 222. Liquid level sensor; 23. Swing assembly; 231. Swing rod; 232. Fixing plate; 233. Protrusion; 234. Pressure sensing plate; 235. Protruding rod; 24. Vent hole; 25. Tank lid; 26. Limiting plate; 261. Limiting hole; 27. Rubber parts; 28. Transparent observation cover; 31. Vacuum pipeline; 32. First manual valve; 41. Silencer; 42. Second manual valve; 43. Filter screen. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In this application, the term "above" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is primarily used to better describe this application and its embodiments, and is not intended to limit the indicated device, element, or component to having a specific orientation, or to construct and operate in a specific orientation. Furthermore, the term "above" may also be used in certain circumstances to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0039] Please see Figures 1-9 The present invention provides a technical solution:

[0040] A water pump anti-siphon device includes an inverted U-shaped main pipeline 1, which is fixedly installed at a target location via a support frame 12. A through-wall pump 11 is installed at the input end of the inverted U-shaped main pipeline 1. A multi-functional valve 2 is installed on the inverted U-shaped main pipeline 1. The multi-functional valve 2 includes a vacuum tank 21, with a sealing flange at the bottom of the vacuum tank 21 fixedly installed on the top of the inverted U-shaped main pipeline 1. A main cavity 211 is provided inside the vacuum tank 21. A fixed end of a float switch 221 and a liquid level sensor 222 are fixedly installed inside the side wall of the vacuum tank 21. The float switch 221 is located above the liquid level sensor 222. Both the movable end of the float switch 221 and the sensing end of the liquid level sensor 222 extend into the main cavity 211. Used to detect the liquid level in the main cavity 211; the inner wall of the vacuum tank 21 is rotatably mounted with a rotating shaft 212 via a sealed bearing, and a swing assembly 23 is provided on the rotating shaft 212; a through vent 24 is opened on the inner wall of the vacuum tank 21, and the vent 24 is connected to the inverted U-shaped main pipeline 1 and the interior of the main cavity 211; a tank cover 25 is fixedly installed at the end of the vacuum tank 21 away from the inverted U-shaped main pipeline 1; a vacuum pump is connected to the side wall of the vacuum tank 21 via a vacuum pipeline 31, and a first manual valve 32 is provided on the vacuum pipeline 31; a silencer 41 is also fixedly installed on the side wall of the vacuum tank 21, and a second manual valve 42 is provided on the silencer 41; the through-wall pump 11, float switch 221, liquid level sensor 222 and vacuum pump are all electrically connected to the controller.

[0041] Specifically, the second manual valve 42 between the silencer 41 and the vacuum tank 21 is closed, and the first manual valve 32 on the vacuum pipeline 31 is opened to ensure that the vacuum passage is unobstructed and the ventilation passage is closed, preparing for vacuuming. The vacuum pump is started, and the vacuum pump performs vacuuming operations on the main cavity 211 of the vacuum tank 21 and the inside of the inverted U-shaped main pipeline 1 through the vacuum pipeline 31. The swing component 23 rotates naturally around the rotation axis 212 under its own gravity, and the swing rod 231 drives the protrusion 233 away from the vent 24, keeping the vent 24 open to ensure smooth vacuuming. Under the action of vacuum suction, the medium rises along the inverted U-shaped main pipeline 1. When the medium level rises to the level sensor, the medium is drawn upwards. When the device 222 is activated, the liquid level sensor 222 sends a signal to the controller. After receiving the signal, the controller controls the wall pump 11 to start automatically. The wall pump 11 works in conjunction with the vacuum pump to push the medium liquid level to continue to rise. When the liquid level rises to trigger the float switch 221, the float switch 221 sends a position signal to the controller. The controller immediately controls the vacuum pump to stop automatically to prevent the medium from entering the vacuum pump and causing blockage and damage. After the vacuum pump stops, the first manual valve 32 is closed to cut off the vacuum passage. At this time, the medium being pumped normally will cause the swing component 23 to rotate around the axis, close the vent 24, open the second manual valve 42, connect the silencer 41 and the vacuum tank 21, and complete the switching of the vacuum system.

[0042] In one embodiment of the present invention, the vacuum pump is an oil-lubricated rotary vane vacuum pump.

[0043] In one embodiment of the present invention, the swing assembly 23 includes a swing rod 231. One end of the swing rod 231 is fixedly installed outside the rotating shaft 212, and the other end of the swing rod 231 is fixedly installed with a fixing plate 232. The fixing plate 232 is located inside the inverted U-shaped main pipeline 1. The end of the swing rod 231 away from the fixing plate 232 is integrally formed with a protrusion 233 for selectively blocking the vent hole 24. A protruding rod 235 is fixedly installed outside the protrusion 233. In addition, a limiting plate 26 is fixedly installed on the inner wall of the vacuum tank 21. A limiting hole 261 is opened on the limiting plate 26. The protruding rod 235 passes through the limiting hole 261 to limit the rotation range of the swing rod 231. In addition, a rubber part 27 is fixedly provided around the vent hole 24. The protrusion 233 seals the vent hole 24 by pressing against the rubber part 27.

[0044] In one embodiment of the present invention, a transparent observation cover 28 is also fixedly installed on the side wall of the vacuum tank 21 by a sealing flange for manual observation of the medium state inside the vacuum tank 21.

[0045] In one embodiment of the present invention, a filter screen 43 is snapped into the input end of the muffler 41 to prevent external impurities from being sucked into the vacuum tank 21 during the siphon destruction process.

[0046] In one embodiment of the present invention, a pressure sensing plate 234 is fixedly installed on the protrusion 233. The movement trajectory of the pressure sensing plate 234 intersects with the rubber part 27 and is used to monitor the sealing pressure between the protrusion 233 and the rubber part 27. The pressure sensing plate 234 is electrically connected to the controller.

[0047] In use, the forward water flow in the inverted U-shaped main pipeline 1 impacts the fixing plate 232 of the swing assembly 23, pushing the swing rod 231 to rotate around the rotation axis 212, so that the protrusion 233 presses tightly against the rubber part 27 around the vent hole 24, achieving a complete seal of the vent hole 24. The limiting plate 26 limits the rotation range of the swing rod 231 through the limiting hole 261, ensuring that the sealing pressure of the protrusion 233 on the rubber part 27 is moderate. The pressure sensing plate 234 monitors the sealing pressure in real time and transmits the signal to the controller to ensure a stable and reliable sealing state.

[0048] The operator observes the liquid level of the medium in the vacuum tank 21 through the transparent observation cover 28, confirms that the liquid level is stable and the vent 24 is sealed in place, and a stable water flow is formed in the inverted U-shaped main pipeline 1. At this time, the vacuum pump can be disassembled and stored, and the through-wall pump 11 enters a continuous and stable normal operation state.

[0049] When the through-wall pump 11 stops automatically or stops operating due to a malfunction, the inverted U-shaped main pipeline 1 loses its forward power, and the medium flows in the reverse direction under the siphon effect. The reverse water flow strongly impacts the fixing plate 232 of the swing assembly 23. The thrust of the reverse water flow and the weight of the swing assembly 23 work together to drive the swing rod 231 to rotate around the rotation axis 212, causing the protrusion 233 to disengage from the rubber part 27 around the vent hole 24. The vent hole 24 automatically opens completely, and the limit plate 26 restricts the rotation stroke of the swing rod 231 to prevent excessive swinging of the components and collision damage. External air enters the inverted U-shaped main pipeline 1 through the silencer 41, filter screen 43, second manual valve 42, and vent 24 in sequence, quickly breaking the vacuum and siphon state in the pipeline, completely blocking the backflow of the medium, and achieving medium isolation between the outlet side and the inlet side. Equipment inspectors can directly observe the liquid level in the vacuum tank 21 through the transparent observation cover 28. If there is no medium in the vacuum tank 21, it can be preliminarily determined that the wall-penetrating pump 11 has stopped and the siphon has been destroyed. Combined with parameters such as the operating current of the wall-penetrating pump 11, the operating status of the equipment can be quickly confirmed.

[0050] Working principle: such as Figure 2 As shown, close the second manual valve 42 between the silencer 41 and the vacuum tank 21, and open the first manual valve 32 on the vacuum pipeline 31 to ensure that the vacuum passage is unobstructed and the ventilation passage is closed, in preparation for vacuuming.

[0051] The vacuum pump is started, and it evacuates the main cavity 211 of the vacuum tank 21 and the inside of the inverted U-shaped main pipeline 1 through the vacuum pipeline 31. The swing component 23 rotates naturally around the rotation axis 212 under its own gravity. The swing rod 231 drives the protrusion 233 away from the vent 24, keeping the vent 24 open to ensure smooth vacuum extraction. Under the action of vacuum suction, the medium rises along the inverted U-shaped main pipeline 1. When the medium level rises to the contact level sensor 222 (e.g., when the liquid level reaches the contact level sensor 222), the medium will be drawn upwards. Figure 4 As shown in the figure, the liquid level sensor 222 sends a signal to the controller, and the controller controls the through-wall pump 11 to start automatically after receiving the signal.

[0052] The through-wall pump 11 works in conjunction with the vacuum pump to push the medium level to continue rising. When the level rises to the point that the float switch 221 is triggered (e.g., Figure 5 As shown in the figure, the float switch 221 sends a position signal to the controller, and the controller immediately controls the vacuum pump to stop automatically to prevent the medium from entering the vacuum pump and causing blockage and damage.

[0053] After the vacuum pump stops, close the first manual valve 32 to cut off the vacuum passage, and simultaneously open the second manual valve 42 to connect the silencer 41 and the vacuum tank 21, thus completing the switching of the vacuum system (e.g., Figure 6 (As shown).

[0054] The forward water flow within the inverted U-shaped main pipeline 1 impacts the fixing plate 232 of the swing assembly 23, pushing the swing rod 231 to rotate around the rotation axis 212. This causes the protrusion 233 to press tightly against the rubber part 27 around the vent 24, achieving a complete seal of the vent 24. The limiting plate 26 limits the rotation range of the swing rod 231 through the limiting hole 261, ensuring that the sealing pressure of the protrusion 233 on the rubber part 27 is moderate. The pressure sensing plate 234 monitors the sealing pressure in real time and transmits the signal to the controller, ensuring a stable and reliable sealing state (e.g., ...). Figure 3 (As shown).

[0055] The operator observes the liquid level of the medium in the vacuum tank 21 through the transparent observation cover 28, confirms that the liquid level is stable and the vent 24 is sealed in place, and a stable water flow is formed in the inverted U-shaped main pipeline 1. At this time, the vacuum pump can be disassembled and stored, and the through-wall pump 11 enters a continuous and stable normal operation state, thereby realizing the use of a small power pump to meet the start-up and normal operation requirements, avoiding the energy waste and equipment redundancy caused by "using a large horse to pull a small cart".

[0056] When the through-wall pump 11 stops automatically or stops operating due to a malfunction, the inverted U-shaped main pipeline 1 loses its forward power, and the medium flows in the reverse direction under the siphon effect. The reverse water flow strongly impacts the fixed plate 232 of the swing assembly 23. The thrust of the reverse water flow and the weight of the swing assembly 23 work together to drive the swing rod 231 to rotate around the rotation axis 212, causing the protrusion 233 to disengage from the rubber part 27 around the vent hole 24, and the vent hole 24 automatically opens completely (as shown). Figure 7 , Figure 8 As shown), the limit plate 26 restricts the rotation stroke of the swing arm 231 to prevent excessive swinging of components and collision damage. External air enters the inverted U-shaped main pipeline 1 through the silencer 41, filter screen 43, second manual valve 42, and vent 24 in sequence, thereby preventing foreign objects from entering the vacuum pump and pipeline, reducing equipment failure and maintenance frequency, ensuring long-term stability of vacuuming and siphon breaking functions, quickly breaking the vacuum and siphon state in the pipeline, completely blocking the backflow of the medium, and achieving medium isolation between the outlet and inlet sides. Equipment inspectors can directly observe the liquid level in the vacuum tank 21 through the transparent observation cover 28. If there is no medium in the vacuum tank 21, It can be preliminarily determined that the through-wall pump 11 has stopped and the siphon has been destroyed. Combined with parameters such as the operating current of the through-wall pump 11, the equipment's operating status can be quickly confirmed, allowing for the rapid introduction of air to destroy the siphon, blocking media backflow. This eliminates the need for a flap valve and the additional power consumption required to open it during startup. In summary, when the through-wall pump 11 stops abnormally, the siphon in the pipeline will cause media backflow. At this time, the above structural design allows for automatic opening of the air path to destroy the siphon, automatically stopping the media backflow. No flap valve is needed; the purchase cost of the flap valve and the electricity cost required to open it during normal operation can be eliminated, reducing costs and increasing efficiency (existing technical structures are as follows). Figure 9 (As shown).

[0057] The signal interaction of the various components appearing in this application adopts the PLC control protocol commonly used in industrial equipment, which is common knowledge to those skilled in the art and can be implemented without additional detailed description. The control logic and signal interaction method are existing technologies and will not be described in detail. The standard parts used in this application can all be purchased from the market. The specific connection methods of each part are all connected by conventional methods such as riveting and welding that are mature in the existing technology. The standard parts are all of conventional models in the existing technology, and the circuit connection adopts conventional connection methods in the existing technology.

[0058] It should be noted that the above electrical components are all existing technology products. They are selected, installed and debugged by those skilled in the art according to the needs of use to ensure that all electrical appliances can work normally. The components are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known by those skilled in the art through technical manuals or conventional experimental methods. No specific restrictions are made here.

[0059] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0060] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A water pump anti-siphon device, comprising an inverted U-shaped main pipeline (1), wherein a through-wall pump (11) is provided at the input end of the inverted U-shaped main pipeline (1), characterized in that: A multi-functional valve (2) is provided on the inverted U-shaped main pipeline (1). The multi-functional valve (2) includes a vacuum tank (21). The bottom sealing flange of the vacuum tank (21) is fixedly installed on the top of the inverted U-shaped main pipeline (1). A main cavity (211) is provided inside the vacuum tank (21). The fixed end of a float switch (221) and a liquid level sensor (222) are fixedly installed inside the side wall of the vacuum tank (21). The float switch (221) is located above the liquid level sensor (222). The movable end of the float switch (221) and the sensing end of the liquid level sensor (222) both extend into the main cavity (211). The float switch (221) and the liquid level sensor (222) are both used to detect the liquid level in the main cavity (211). The inner wall of the vacuum tank (21) is rotatably mounted with a rotating shaft (212) via a sealed bearing, and a swing assembly (23) is provided on the rotating shaft (212). The inner wall of the vacuum tank (21) is provided with a through vent (24), which is connected to the inside of the inverted U-shaped main pipeline (1) and the main cavity (211). A tank cover (25) is fixedly installed at the end of the vacuum tank (21) away from the inverted U-shaped main pipeline (1). A vacuum pump is connected to the side wall of the vacuum tank (21) via a vacuum pipeline (31). A first manual valve (32) is provided on the vacuum pipeline (31). A silencer (41) is also fixedly installed on the side wall of the vacuum tank (21). A second manual valve (42) is provided on the silencer (41).

2. The anti-siphon device for water pumps according to claim 1, characterized in that: The vacuum pump is an oil-lubricated rotary vane vacuum pump.

3. The anti-siphon device for water pumps according to claim 1, characterized in that: The swing assembly (23) includes a swing rod (231), one end of which is fixedly installed outside the rotating shaft (212), and the other end of which is fixedly installed with a fixing plate (232). The fixing plate (232) is located inside the inverted U-shaped main pipeline (1). The end of the swing rod (231) away from the fixing plate (232) is integrally formed with a protrusion (233), and a protruding rod (235) is fixedly installed outside the protrusion (233).

4. The anti-siphon device for water pumps according to claim 3, characterized in that: A limiting plate (26) is also fixedly installed on the inner wall of the vacuum tank (21). A limiting hole (261) is opened on the limiting plate (26), and the protruding rod (235) passes through the limiting hole (261).

5. The anti-siphon device for water pumps according to claim 3, characterized in that: A rubber part (27) is fixedly provided around the vent (24), and the protrusion (233) seals the vent (24) by pressing against the rubber part (27).

6. The anti-siphon device for water pumps according to claim 1, characterized in that: A transparent observation cover (28) is also fixedly installed on the side wall of the vacuum tank (21) by a sealing flange.

7. The anti-siphon device for water pumps according to claim 1, characterized in that: The silencer (41) has a filter screen (43) inside the input end to prevent external impurities from being sucked into the vacuum tank (21) during the siphon destruction process.

8. The anti-siphon device for water pumps according to claim 5, characterized in that: A pressure sensor (234) is fixedly installed on the protrusion (233), and the movement trajectory of the pressure sensor (234) intersects with the rubber part (27).

9. The anti-siphon device for water pumps according to claim 1, characterized in that: The inverted U-shaped main pipeline (1) is fixedly installed at the target position by a support frame (12).

10. The anti-siphon device for water pumps according to any one of claims 1-8, characterized in that: The through-wall pump (11), float switch (221), liquid level sensor (222), pressure sensor (234) and vacuum pump are all electrically connected to the controller.

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