High pool anti-overflow backflow device

Abstract

The utility model provides a kind of high pool anti-overflow water backflow device, it is mainly related to the technical field of liquid storage, including high pool, control device, float ball valve mechanism and water suction pipe, the high pool overall is hollow container shape structure, control device is arranged on the outside wall of high pool, control device is fixed on the support structure outside high pool by support, and control device and the outside wall of high pool keep certain spacing, water outlet of water suction pipe is set in high pool inside and is connected with float ball valve mechanism;Integration float ball valve mechanism and electromagnetic flowmeter assembly, float ball is accurately linked with liquid level spool adjustment, avoid position interference, electromagnetic flowmeter can also monitor water flow in real time, double protection anti-overflow and backflow control, simultaneously, its water suction pipe design, control device wiring protection etc. Detail is more stable and durable than traditional device, greatly reduce the risk of overflow and maintenance cost.

Description

Technical Field

[0001] This utility model mainly relates to the technical field of liquid storage, specifically a device for preventing overflow and backflow of water in a high-level pool. Background Technology

[0002] In applications such as high-level water storage and supply, most common overflow prevention devices on the market rely on a single float switch to control the flow, which has obvious defects.

[0003] The float is easily displaced by the impact of water flow in the pool, causing false triggering of the switch and making it impossible to accurately match changes in liquid level to prevent overflow. In addition, the lack of a water flow monitoring structure makes it difficult to grasp the flow status during drainage or return, and it is difficult to troubleshoot abnormalities in a timely manner. Furthermore, the pipeline connection design of traditional devices is simple, and long-term use is prone to damage due to water flow impact and corrosion, resulting in insufficient stability. This not only frequently causes the risk of overflow, but also requires a lot of manpower and resources for maintenance, increasing the cost of use and making it difficult to meet the needs of high-level pools for efficient and stable overflow prevention and return. Utility Model Content

[0004] This utility model mainly provides a device for preventing overflow and backflow of water in a high-level pool, in order to solve the technical problems mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: An overflow prevention and backflow prevention device for elevated tanks includes an elevated tank, a control device, a float valve mechanism, and a suction pipe. The elevated tank is generally a hollow container structure. The control device is installed on the outer wall of the elevated tank and is fixed to a support structure on the outside of the elevated tank by a bracket, with a certain distance maintained between the control device and the outer wall of the elevated tank. A suction pipe is connected to the bottom of the elevated tank. The suction pipe has a combination of horizontal and vertical sections, with one end extending from the outside of the elevated tank to near the tank body. The inlet of the suction pipe is located outside the elevated tank, and the other end penetrates the side wall of the elevated tank. The top enters the interior of the pool body, and the water outlet of the suction pipe is located inside the high-level pool and connected to the float valve mechanism. The high-level pool includes a high-level pool shell and an annular support platform. The high-level pool shell is a cylindrical or square hollow shell structure. The annular support platform is fixed on the inner wall of the high-level pool shell, and the annular support platform is distributed in a closed ring along the circumference of the inner wall of the high-level pool shell. A certain vertical distance is left between the upper surface of the annular support platform and the top of the high-level pool shell, and a certain vertical distance is also left between the lower surface of the annular support platform and the bottom of the high-level pool shell. Its inner ring diameter is smaller than the inner diameter of the high-level pool shell.

[0006] Preferably, the two ends of the suction pipe are respectively provided with a suction pipe inlet and a suction pipe outlet, with the suction pipe outlet located inside the high-level pool; the suction pipe inlet is located outside the high-level pool, and its opening direction is at a preset angle to the opening direction of the suction pipe outlet, and the suction pipe is connected to the internal space of the high-level pool through the suction pipe outlet.

[0007] Preferably, an electromagnetic flowmeter assembly is installed on the body of the suction pipe. The electromagnetic flowmeter assembly is located on the section of the suction pipe outside the elevated pool, in the middle area between the inlet and outlet of the suction pipe or near the inlet. The internal channel of the electromagnetic flowmeter assembly is connected to the internal channel of the suction pipe. The electromagnetic flowmeter assembly includes a flow stabilizing pipe and an electromagnetic flowmeter. The flow stabilizing pipe is a tubular structure with connecting flanges at both ends. One end is fixedly connected to the section of the suction pipe near the elevated pool via a flange, and the other end is fixedly connected to the section of the suction pipe away from the elevated pool via a flange. The electromagnetic flowmeter has a circular box-shaped structure and is installed on the outer wall of the flow stabilizing pipe. The detection end of the electromagnetic flowmeter is in contact with the wall of the flow stabilizing pipe, and its installation position is in the middle of the length direction of the flow stabilizing pipe.

[0008] Preferably, the float valve mechanism includes a feedback component, a float, a valve, a valve core, and a valve seat. The float valve mechanism is located at or near the center of the elevated pool, and the top height of the float valve mechanism is lower than the top height of the elevated pool. The feedback component is a combination of a rod and a hinge, one end of which is fixedly connected to the outer wall of the float via a hinge. The float is a spherical hollow structure located on the liquid inside the elevated pool. The other end of the feedback component is fixedly connected to the outer wall of the valve via a hinge. The valve core is a cylindrical or conical structure, located in the internal cavity of the valve seat, with a certain gap between the outer wall of the valve core and the inner wall of the valve seat. The inlet end of the valve seat is sealed to the outlet of the suction pipe, and the liquid transported by the suction pipe directly enters the interior of the valve seat and flows into the elevated pool through the gap between the valve core and the valve seat. The valve is a disc-shaped structure, installed at the top opening of the valve seat, and the center of the valve is connected to the top of the valve core. The valve seat is a cylindrical hollow structure, and its bottom is fixed to the annular support platform of the elevated pool by bolts.

[0009] Preferably, the control device is fixed to the outer wall of the high-level pool by bolts. The wiring terminals inside the control device are connected to the signal output terminal of the electromagnetic flowmeter and the signal output terminal of the feedback component in the float valve mechanism by wires. After the wires pass out from the bottom of the control device, they extend along the outer wall of the high-level pool to the electromagnetic flowmeter and the feedback component, and the wires are covered with protective tubes.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: Integrating a float valve mechanism and an electromagnetic flow meter component, the float valve precisely adjusts in conjunction with the liquid level to avoid positional interference. The electromagnetic flow meter can also monitor water flow in real time, providing dual protection against overflow and backflow control. In addition, its suction pipe design and control device wiring protection details make it more stable and durable than traditional devices, significantly reducing the risk of overflow and maintenance costs.

[0011] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0012] Figure 1 This is a schematic diagram showing the position and structure of the device and the high-level pool according to this utility model; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is a schematic diagram of the electromagnetic flowmeter assembly structure of this utility model; Figure 4 This is a schematic diagram of the float valve mechanism of this utility model.

[0013] The attached diagram shows the following labels: 1. High-level tank; 11. High-level tank shell; 12. Annular support platform; 2. Control device; 3. Electromagnetic flowmeter assembly; 31. Flow stabilizing pipe; 32. Electromagnetic flowmeter; 4. Float valve mechanism; 41. Feedback assembly; 42. Float; 43. Valve; 44. Valve core; 45. Valve seat; 5. Suction pipe; 51. Suction pipe inlet; 52. Suction pipe outlet. Detailed Implementation

[0014] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0015] An overflow prevention and backflow device for a high-level pool includes a high-level pool 1, a control device 2, a float valve mechanism 4, and a suction pipe 5. The high-level pool 1 has a hollow container-like structure and serves as the core carrier for liquid storage, meeting the temporary liquid storage needs in scenarios such as agricultural irrigation, industrial water supply, and municipal water storage. It provides basic storage space for subsequent overflow prevention and backflow control. The control device 2 is installed on the outer wall of the high-level pool 1. This device serves as the system's control center, responsible for receiving and analyzing various monitoring signals and issuing control commands. The control device 2 is fixed to the support structure on the outside of the high-level pool 1 by a bracket, maintaining a certain distance from the outer wall of the high-level pool 1. The spacing is designed to prevent condensate and liquid residue on the outer wall of the elevated tank 1 from directly contacting the control device 2, while also reducing the impact of vibration on the control device 2 and ensuring the stable operation of its internal circuits and components. The suction pipe 5, as the core channel for liquid transport, is a combination of horizontal and vertical sections, made of 304 stainless steel with a pressure resistance rating ≥1.6MPa. One end extends from the outside of the elevated tank 1 to near the tank body, with the suction pipe inlet 51 located outside the elevated tank 1. The other end penetrates the side wall or top of the elevated tank 1 to enter the tank body. The suction pipe outlet 52 is located inside the elevated tank 1 and connected to the float valve mechanism 4, which can be adjusted according to actual needs. The high-level tank 1 is connected to a return pipe, drainage pipe, or subsequent treatment equipment to achieve directional transport and return control of liquids, according to actual application requirements. The high-level tank 1 includes a high-level tank shell 11 and an annular support platform 12. The high-level tank shell 11 is a cylindrical or square-column hollow shell structure. The cylindrical structure facilitates the uniform distribution of liquid pressure, while the square-column structure is more conducive to spatial layout and installation. Both structures can provide a stable storage cavity for the liquid, while also possessing certain pressure resistance and leak-proof capabilities, ensuring long-term liquid storage safety. The annular support platform 12 is fixed to the inner wall of the high-level tank shell 11 and forms a closed annular shape along the circumference of the inner wall of the high-level tank shell 11. The main function of the annular support platform 12 is to provide a stable installation support point for the subsequent float valve mechanism 4. A certain vertical distance is left between the upper surface of the annular support platform 12 and the top of the high-level tank shell 11 to avoid it occupying the top liquid storage space of the high-level tank 1 and to ensure that the liquid storage volume of the high-level tank 1 meets the standard. A certain vertical distance is also left between the lower surface and the bottom of the high-level tank shell 11 to prevent impurities settled at the bottom of the tank from accumulating on the annular support platform 12 and affecting the stability of the support and the operation of the float valve mechanism 4. Its inner ring diameter is smaller than the inner diameter of the high-level tank shell 11, which can ensure the structural strength of the annular support platform 12 itself and reserve sufficient space for the liquid flow in the tank and the installation of equipment.

[0016] For details, please refer to the appendix. Figure 2The suction pipe 5 has a suction pipe inlet 51 and a suction pipe outlet 52 at both ends. The suction pipe outlet 52 is located inside the high-level pool 1 and maintains a certain vertical height from the bottom surface of the high-level pool 1. This height design can prevent sediment and impurities from settling at the bottom of the pool from entering the suction pipe 5, preventing pipe blockage, and ensuring that water can still be drawn normally when the liquid level in the pool drops to a reasonable low level, reducing the amount of residual liquid in the pool. The suction pipe inlet 51 is located outside the high-level pool 1. The suction pipe 5 is connected to the internal space of the high-level pool 1 through the suction pipe outlet 52, allowing water to flow into the high-level pool 1 and forming a complete water flow path. This realizes the export and return control of liquid in the high-level pool 1, providing key channel support for overflow prevention and liquid level regulation.

[0017] For details, please refer to the appendix. Figure 3 The electromagnetic flowmeter assembly 3, as the core component for water flow status monitoring, can acquire real-time liquid flow data within the suction pipe 5, providing data support for the control device 2. The electromagnetic flowmeter assembly 3 is installed on the pipe body of the suction pipe 5. It is positioned on the section of the suction pipe 5 located outside the high-level tank 1, in the middle area between the suction pipe inlet 51 and the suction pipe outlet 52, or near the suction pipe inlet 51. The installation position near the suction pipe inlet 51 allows for faster capture of water flow changes, ensuring the accuracy and timeliness of flow monitoring. The internal channel of the electromagnetic flowmeter assembly 3 is connected to the internal channel of the suction pipe 5, ensuring smooth liquid flow and preventing flow obstruction due to assembly installation. The electromagnetic flowmeter assembly 3 includes a flow stabilizing pipe 31 and an electromagnetic flowmeter 32. The flow stabilizing pipe 31 is a tubular structure with connecting flanges at both ends. The flange connection facilitates the installation, disassembly, and maintenance of components. When a component malfunctions, it can be quickly replaced without affecting the overall structure of the suction pipe 5. One end of the flange is fixedly connected to the section of the suction pipe 5 near the high-level tank 1, and the other end is fixedly connected to the section of the suction pipe 5 away from the high-level tank 1. This effectively buffers the impact of water flow in the suction pipe 5 and reduces the interference of water flow fluctuations on the detection accuracy of the electromagnetic flowmeter 32. The electromagnetic flowmeter 32 has a circular box-shaped structure and is installed on the outer wall of the flow stabilizing pipe 31. The detection end is in close contact with the pipe wall of the flow stabilizing pipe 31. This close contact design ensures that the detection end can accurately sense the flow rate changes of the liquid in the pipe, with a detection accuracy of ±0.5%FS, avoiding signal attenuation due to gaps. Its installation position is at the end of the flow stabilizing pipe 31 near the water inlet 51 of the suction pipe, where the water flow is most stable, which can further improve the accuracy of flow monitoring.

[0018] For details, please refer to the appendix. Figure 4The float valve mechanism 4, as the core component for liquid level monitoring and preliminary control, can automatically adjust the liquid flow state according to the changes in the liquid level in the high-level tank 1, achieving preliminary protection against overflow. The float valve mechanism 4 includes a feedback component 41, a float 42, a valve 43, a valve core 44, and a valve seat 45. The float valve mechanism 4 is located in the center or near the center of the high-level tank 1, resulting in more uniform liquid level changes in the central area and more accurate reflection of the overall liquid level in the tank. Furthermore, the top height of the float valve mechanism 4 is lower than the top height of the high-level tank 1 to prevent the top of the float valve mechanism 4 from exceeding the height of the high-level tank 1, affecting the sealing of the high-level tank 1, or causing liquid to overflow from the top of the float valve mechanism 4. The valve seat 45... The inlet end is sealed to the outlet 52 of the suction pipe. The liquid transported by the suction pipe 5 directly enters the interior of the valve seat 45 and flows into the high-level pool 1 through the gap between the valve core 44 and the valve seat 45. The feedback component 41 is a rod-shaped structure or a combination of rod and hinge. The rod-shaped structure provides more direct transmission, while the combination of rod and hinge is more flexible and can adapt to larger changes in liquid level. One end of the component is fixedly connected to the outer wall of the float 42 through a hinge or buckle, which can convert the up-and-down movement of the float 42 into its own mechanical transmission. The float 42 is a spherical hollow structure with a density less than that of liquid. It is made of high-density polyethylene with an impact strength ≥10kJ / m² and its center of gravity is located at the bottom 1 / 3. The feedback component and The float is connected by a stainless steel hinge, with a maximum swing angle limited to ±30° to prevent displacement caused by water flow impact. It can float stably in the liquid inside the high-level tank 1, and the spherical structure distributes the force evenly, allowing it to float up and down sensitively with changes in liquid level, providing real-time feedback on the liquid level. The other end of the feedback component 41 is fixedly connected to the outer wall of the valve 43 via a hinge, transmitting the floating signal of the float 42 to the valve 43. The valve core 44 has a cylindrical or conical structure and is located in the internal cavity of the valve seat 45. A cylindrical valve core 44 provides smoother water flow regulation, while a conical valve core 44 provides better sealing. A certain gap is left between the outer wall of the valve core 44 and the inner wall of the valve seat 45, and this gap is for liquid... The system provides a flow channel, and the gap size can be adjusted by moving the valve core 44 to control the liquid flow rate. The valve 43 has a disc-shaped structure and is installed at the top opening of the valve seat 45. The center of the valve 43 is connected to the top of the valve core 44, allowing the valve 43 to drive the valve core 44 to move up and down inside the valve seat 45. When the liquid level rises, the float 42 rises, driving the valve 43 to move upward through the feedback component 41. The valve core 44 rises accordingly, reducing the gap with the inner wall of the valve seat 45 and reducing the liquid flow rate. When the liquid level falls, the float 42 sinks, driving the valve 43 and valve core 44 to move downward, increasing the gap and increasing the liquid flow rate, thus achieving automatic liquid level regulation.The valve seat 45 is a cylindrical hollow structure, and its bottom is fixed to the annular support platform 12 of the high-level pool 1 by bolts. The bolt connection facilitates the installation and maintenance of the float valve mechanism 4, while ensuring the stability of the valve seat 45. The annular support platform 12 restricts the lateral displacement of the float valve mechanism by fixing the valve seat 45, preventing the float 42 from shifting due to water flow impact, and providing a reliable foundation for the movement of the valve core 44 and the valve 43.

[0019] For details, please refer to the appendix. Figure 1 The control device 2 is bolted to the outer wall of the high-level tank 1. The bolt connection is secure and easy to disassemble. When the control device 2 needs maintenance or replacement, it can be operated quickly without damaging the outer wall of the high-level tank 1. The wiring terminals inside the control device 2 are connected to the signal output terminals of the electromagnetic flowmeter 32 and the feedback component 41 in the float valve mechanism 4 via wires, forming a complete signal transmission link: the flow data transmitted by the electromagnetic flowmeter 32 and the liquid level correlation signal transmitted by the feedback component 41 can be converged to the control device 2 in real time. The control device 2 analyzes the data through its internal chip. The control device 2 presets the high liquid level threshold and the normal flow range. When the liquid level signal transmitted by the feedback component 41 reaches the threshold or the electromagnetic flowmeter... When the detected flow rate exceeds the range, the control device 2 activates an audible and visual alarm within 3 seconds and simultaneously sends an adjustment signal to the feedback component 41 to drive the valve core 44 to complete the opening adjustment, thereby achieving intelligent control against overflow and backflow. After the wire passes through the bottom of the control device 2, it extends along the outer wall of the high-level pool 1 to the electromagnetic flowmeter 32 and the feedback component 41. The wire is covered with a protective tube made of polyvinyl chloride with a waterproof rating of IP67 to prevent water vapor from corroding the wire and improve the wiring stability of the control device. The protective tube can effectively isolate the wire from external dust, water vapor, and corrosive substances, and prevent the wire from being damaged by external pulling or friction, ensuring the stability and safety of signal transmission and ensuring the continuous and reliable operation of the entire device's control link.

[0020] The specific operation method of this utility model is as follows: When the liquid is stored in the high-level tank 1, the external liquid enters the suction pipe 5 through the inlet 51 and flows through the electromagnetic flowmeter assembly 3. The electromagnetic flowmeter 32 monitors the flow data in real time and transmits it to the control device 2. The liquid continues to enter the valve seat 45 of the float valve mechanism 4 through the outlet 52 of the suction pipe and flows into the high-level tank 1 through the gap between the valve core 44 and the valve seat 45. When the liquid level in the high-level tank 1 rises, the float 42 floats up, which drives the valve 43 to move upward through the feedback assembly 41. The valve core 44 rises accordingly, reducing the liquid flow gap in the valve seat 45. If the liquid level continues to rise to near the high-level threshold, the feedback component 41 transmits a signal to the control device 2, which issues an alarm and further controls the valve core 44 to reduce the opening until the liquid supply stops. When the liquid level in the high-level tank 1 drops, the float 42 sinks, causing the valve 43 and valve core 44 to move downward, increasing the flow gap and improving the liquid supply. If the electromagnetic flowmeter 32 detects an abnormal flow, it will immediately send a signal back to the control device 2, which will then activate a fault alarm to ensure stable operation of the device.

[0021] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A device for preventing overflow and backflow in a high-level tank, comprising a high-level tank (1), a control device (2), a float valve mechanism (4), and a suction pipe (5), characterized in that, The high-level pool (1) is a hollow container structure. A control device (2) is installed on the outer wall of the high-level pool (1). The control device (2) is fixed to the support structure on the outside of the high-level pool (1) by a bracket, and a certain distance is maintained between the control device (2) and the outer wall of the high-level pool (1). A water suction pipe (5) is connected to the bottom of the high-level pool (1). The water suction pipe (5) includes a water suction pipe inlet (51) and a water suction pipe outlet (52). The pipe body of the water suction pipe (5) is a combination of horizontal and vertical sections. One end extends from the outside of the high-level pool (1) to the vicinity of the pool body. The water suction pipe inlet (51) is located outside the high-level pool (1), and the other end penetrates the side wall or top of the high-level pool (1) to enter the interior of the pool body. The water suction pipe outlet (52) is located inside the high-level pool (1) and connected to the float valve mechanism (4). The high-level pool (1) includes a high-level pool shell (11) and an annular support platform (12). The high-level pool shell (11) is a cylindrical or square hollow shell structure. The annular support platform (12) is fixed on the inner wall of the high-level pool shell (11). The annular support platform (12) is distributed in a closed ring along the circumferential direction of the inner wall of the high-level pool shell (11). There is a certain vertical distance between the upper surface of the annular support platform (12) and the top of the high-level pool shell (11), and there is also a certain vertical distance between the lower surface and the bottom of the high-level pool shell (11). The inner ring diameter is smaller than the inner diameter of the high-level pool shell (11).

2. The high-level pool overflow prevention and backflow device according to claim 1, characterized in that, The water outlet (52) of the suction pipe is located inside the high-level pool (1); the water inlet (51) of the suction pipe is located outside the high-level pool (1), and its opening direction is at a preset angle to the opening direction of the water outlet (52) of the suction pipe. The suction pipe (5) is connected to the internal space of the high-level pool (1) through the water outlet (52) of the suction pipe.

3. The high-level pool overflow prevention and backflow device according to claim 2, characterized in that, It also includes an electromagnetic flow meter assembly (3), which is installed on the body of the suction pipe (5). The electromagnetic flow meter assembly (3) is located on the section of the suction pipe (5) outside the high-level pool (1), and is located in the middle area between the suction pipe inlet (51) and the suction pipe outlet (52) or near the suction pipe inlet (51). The internal channel of the electromagnetic flow meter assembly (3) is connected to the internal channel of the suction pipe (5). The electromagnetic flow meter assembly (3) includes a flow stabilizing pipe (31) and an electromagnetic flow meter. The flow meter (32) and the flow stabilizing pipe (31) are tubular structures with connecting flanges at both ends. One end is fixedly connected to the section of the suction pipe (5) near the high-level pool (1) through the flange, and the other end is fixedly connected to the section of the suction pipe (5) away from the high-level pool (1) through the flange. The electromagnetic flow meter (32) is a circular box-shaped structure and is installed on the outer wall of the flow stabilizing pipe (31). The detection end of the electromagnetic flow meter (32) is in contact with the pipe wall of the flow stabilizing pipe (31), and its installation position is in the middle of the length direction of the flow stabilizing pipe (31).

4. The high-level pool overflow prevention and backflow device according to claim 1, characterized in that, The float valve mechanism (4) includes a feedback component (41), a float (42), a valve (43), a valve core (44), and a valve seat (45). The float valve mechanism (4) is located at or near the center of the high-level pool (1), and the top height of the float valve mechanism (4) is lower than the top height of the high-level pool (1). The feedback component (41) is a rod and hinge combination structure. One end of the rod is fixedly connected to the outer wall of the float (42) through a hinge. The float (42) is a spherical hollow structure located on the liquid inside the high-level pool (1). The other end of the feedback component (41) is fixedly connected to the outer wall of the valve (43) through a hinge. The valve core (44) is cylindrical or... The conical structure is set in the internal cavity of the valve seat (45), and there is a certain gap between the outer wall of the valve core (44) and the inner wall of the valve seat (45); the inlet end of the valve seat (45) is sealed to the outlet (52) of the suction pipe, and the liquid transported by the suction pipe (5) directly enters the interior of the valve seat (45) and flows into the high-level pool (1) through the gap between the valve core (44) and the valve seat (45); the valve (43) is a disc-shaped structure, installed at the top opening of the valve seat (45), and the center position of the valve (43) is connected to the top position of the valve core (44). The valve seat (45) is a cylindrical hollow structure, and its bottom is fixed to the annular support platform (12) of the high-level pool (1) by bolts.

5. The high-level pool overflow prevention and backflow device according to claim 1, characterized in that, The control device (2) is fixed to the support structure outside the high-level pool (1) by a bracket. The wiring terminals inside the control device (2) are connected to the signal output terminal of the electromagnetic flowmeter (32) and the signal output terminal of the feedback component (41) in the float valve mechanism (4) respectively by wires. After the wires pass out from the bottom of the control device (2), they extend along the outer wall of the high-level pool (1) to the electromagnetic flowmeter (32) and the feedback component (41), and the wires are covered with protective tubes.

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