A magnetic flap level gauge with self-flushing function

Abstract

The present invention discloses a magnetic flap level gauge with a self-flushing function, comprising a level gauge body and a float arranged in the level gauge body; the level gauge body comprises a level gauge main pipe, a level gauge auxiliary pipe and a cover, the diameter of the level gauge auxiliary pipe is larger than the diameter of the level gauge main pipe, the upper end of the level gauge auxiliary pipe is sleeved on the lower end of the level gauge main pipe and is correspondingly connected, and the water inlet is arranged on the level gauge auxiliary pipe; a filter cartridge is arranged in the level gauge auxiliary pipe, the upper and lower ends of the filter cartridge are respectively correspondingly connected to the lower end of the level gauge main pipe and the cover, a plurality of water holes are arranged on the surface of the filter cartridge, and a filter screen is arranged on the outer surface of the filter cartridge for intercepting iron in the water. The level gauge auxiliary pipe is made of ferromagnetic material and a coil is arranged on its outer side, which can generate magnetic adsorption of iron when energized. The level gauge has adsorption and filtering functions, can effectively remove iron in water, reduce the number of maintenance times, and achieve a longer normal use cycle; when flushing, it can be flushed by internal pressure, and can effectively reduce the labor intensity of maintenance personnel.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a magnetic flap level gauge with a self-flushing function. Background Art

[0002] In wide-plate metallurgical descaling projects, pumps with high flow rates often require accumulators for pressure stabilization and flow regulation. These accumulators are equipped with magnetic flap level gauges. Because the metallurgical industry operates 24 / 7, the accuracy and timeliness of the level gauge's display are crucial. Because the water in the accumulator is turbid circulating water (steel mills simply filter and recycle it after descaling, and it contains a high concentration of iron powder and rust), this water often accumulates on the float within the magnetic flap level gauge. This increases the float's diameter, reducing its mobility. When the adsorption reaches a certain level, the float becomes stuck and no longer responds to actual water level changes, affecting the accuracy and timeliness of the level gauge's display. This situation requires immediate repair.

[0003] Liquid level gauges are typically 4 meters long and installed vertically, requiring maintenance personnel to climb high, which is physically demanding and unsafe. Therefore, technical personnel in this field are eager to address the challenges of extending the normal life of liquid level gauges, reducing the number of maintenance cycles, and minimizing the labor intensity of maintenance personnel. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a magnetic flap level gauge with a built-in flushing function. The level gauge has adsorption and filtration functions, which can effectively remove iron in water, reduce the number of maintenance times, and achieve a longer normal use cycle; during flushing, flushing can be carried out reliably by internal pressure, and the labor intensity of maintenance personnel can be effectively reduced.

[0005] The technical solution of the present invention is achieved as follows:

[0006] A magnetic flap level gauge with a built-in flushing function comprises a level gauge body and a float arranged in the level gauge body. The top and bottom of the level gauge body are respectively provided with an exhaust port and a sewage outlet. The upper and lower side walls of the level gauge body are respectively provided with an air inlet and a water inlet, which are used to connect to the accumulator for gas phase and liquid phase respectively. A display flap is provided on the level gauge body.

[0007] The liquid level gauge body includes a liquid level gauge main pipe, a liquid level gauge auxiliary pipe arranged at the lower end of the liquid level gauge main pipe and a sealing cover arranged at the lower end of the liquid level gauge auxiliary pipe. The diameter of the liquid level gauge auxiliary pipe is larger than the diameter of the liquid level gauge main pipe. The upper end of the liquid level gauge auxiliary pipe is sleeved on the lower end of the liquid level gauge main pipe and is correspondingly connected to the liquid level gauge main pipe through a horizontally arranged annular connecting plate. The water inlet is arranged on the liquid level gauge auxiliary pipe, and the sewage outlet is arranged on the sealing cover.

[0008] A filter cartridge is provided in the auxiliary pipe of the liquid level gauge. The upper and lower ends of the filter cartridge are respectively connected to the lower end of the liquid level gauge main pipe and the cover, thereby forming an annular accommodating cavity between the filter cartridge and the auxiliary pipe of the liquid level gauge. A plurality of water holes are provided on the surface of the filter cartridge to facilitate the water in the accommodating cavity to enter the filter cartridge, and a filter screen is provided on the outer surface of the filter cartridge to intercept iron in the water and prevent iron from entering the filter cartridge and the liquid level gauge main pipe.

[0009] Furthermore, the auxiliary pipe of the liquid level gauge is made of ferromagnetic material, and the main pipe and connecting plate of the liquid level gauge are both made of stainless steel; a coil is provided on the outside of the auxiliary pipe of the liquid level gauge, and the coil is connected to a power supply, so that the auxiliary pipe of the liquid level gauge generates magnetism when power is turned on, and then absorbs the iron entering the auxiliary pipe of the liquid level gauge.

[0010] Furthermore, the filter cartridge and the liquid level gauge main pipe are coaxially arranged, the liquid level gauge auxiliary pipe and the filter cartridge are eccentrically arranged, and the distance between the center axis of the liquid level gauge auxiliary pipe and the water inlet is smaller than the distance between the center axis of the filter cartridge and the water inlet.

[0011] Furthermore, an arc-shaped baffle is provided in the accommodating cavity, which is coaxially arranged with the liquid level gauge main pipe and corresponds to the water inlet, so that water enters the accommodating cavity tangentially along both sides of the baffle after entering from the water inlet, and the upper end of the baffle is correspondingly connected to the lower surface of the connecting plate.

[0012] Furthermore, an annular collection groove is provided on the upper surface of the cover corresponding to the accommodating cavity. The collection groove is a conical structure with a larger upper part and a smaller lower part. Two flushing ports are provided on the cover corresponding to the collection groove. The two flushing ports are evenly distributed along the collection groove to facilitate the discharge of the collected iron. A flushing valve is provided at each flushing port for opening and closing the flushing port.

[0013] Furthermore, the auxiliary pipe of the liquid level gauge has a tapered structure that is smaller at the top and larger at the bottom.

[0014] Furthermore, the lower end of the auxiliary pipe of the liquid level gauge has a connecting flange, and the sealing cover is fixedly connected to the connecting flange by bolts; the sewage outlet has a conical structure with a larger upper part and a smaller lower part, which facilitates the discharge of the float from the sewage outlet; correspondingly, a bottom cover is provided at the sewage outlet to facilitate the closure of the sewage outlet.

[0015] Furthermore, the filter cartridge has a conical structure that is larger at the top and smaller at the bottom. The upper and lower ends of the filter cartridge respectively have a vertically arranged upper positioning sleeve and a lower positioning sleeve. The upper positioning sleeve is arranged on the lower end of the liquid level gauge main pipe to achieve the positioning of the upper end of the filter cartridge; a positioning cylinder is vertically provided on the sealing cover corresponding to the lower end of the filter cartridge, and the lower positioning sleeve is arranged on the positioning cylinder to achieve the positioning of the lower end of the filter cartridge; the sewage outlet is arranged on the inner side of the positioning cylinder.

[0016] Furthermore, a vertically arranged air pipe is connected to the exhaust port, the upper end of the air pipe is bent and connected to the exhaust port, an exhaust valve is provided at the lower end of the air pipe, and a branch pipe is connected to the air pipe, which is arranged close to the lower end of the air pipe, one end of the branch pipe is connected to the air pipe, and the other end is provided with an inspection valve and a pressure gauge.

[0017] Furthermore, the water inlet has a horizontally arranged connecting pipe, one end of which is inserted into the accommodating cavity and fixed to the auxiliary pipe of the liquid level gauge, and the other end is provided with a pipe flange; the inserted end of the connecting pipe has an outlet inclined downward.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention sets a filtering mechanism in the auxiliary pipe of the liquid level gauge to remove iron in the water by filtering, thereby reducing the amount of iron entering the main pipe of the liquid level gauge. The auxiliary pipe of the liquid level gauge is made of ferromagnetic material, and a coil is set outside the auxiliary pipe of the liquid level gauge. By passing a weak current through the coil, the auxiliary pipe of the liquid level gauge becomes magnetic, which absorbs the iron entering the accommodating cavity, further reducing the amount of iron entering the main pipe of the liquid level gauge. As a result, the float does not absorb the iron and does not get stuck, accurately displaying the water level. At the same time, it can also effectively extend the normal use period of the liquid level gauge and reduce the number of maintenance times.

[0020] 2. The eccentric setting of the filter cartridge and the auxiliary pipe of the liquid level gauge in the present invention can effectively increase the volume of the accommodating chamber corresponding to the water inlet, thereby reducing the flow rate of the water flow. At the same time, through the action of the arc-shaped baffle, the water flows tangentially along both sides of the baffle into the rear of the accommodating chamber. Combined with the eccentric setting of the filter cartridge and the auxiliary pipe of the liquid level gauge, the flow channel of the water changes from large to small during the flow process, thereby making the water flow rate in the accommodating chamber more uniform, reducing the impact of the water flow on the adsorption force of the filter screen and the auxiliary pipe of the liquid level gauge, enhancing the iron removal effect, and thus extending the normal use cycle of the liquid level gauge.

[0021] 3. During the flushing and maintenance process, the maintenance personnel first release the original pressure of about 30 MPa in the liquid level gauge to 3~5 MPa, and then rely on the pressure in the liquid level gauge itself and the gravity of the water to remove the float from the sewage outlet. The whole operation can be carried out standing on the ground without climbing, which can effectively reduce the labor intensity of the maintenance personnel and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 -Schematic diagram of the structure of the present invention.

[0023] Figure 2-Figure 1 Enlarged view of part A.

[0024] Figure 3 -Schematic diagram of the structure of the filtering mechanism.

[0025] Figure 4 -Schematic diagram of the structure of the filter cartridge and the liquid level gauge auxiliary pipe eccentrically arranged.

[0026] Figure 5 - Schematic diagram illustrating the flow of water in the accommodating chamber.

[0027] Figure 6 -Schematic diagram of the structure of the present invention in use.

[0028] Among them: 1-gas-related shut-off valve; 2-liquid level gauge main pipe; 3-float; 4-liquid level shut-off valve; 5-filter mechanism; 6-connecting flange; 7-sealing cover; 8-flushing valve; 9-bottom cover; 10-coil; 11-coil protection cover; 12-power supply; 13-switch; 14-liquid level gauge auxiliary pipe; 15-connecting plate; 16-exhaust valve; 17-inspection valve; 18-pressure gauge; 19-display column; 20-air pipe; 21-upper positioning sleeve; 22-upper cable tie; 23-filter screen; 24-filter cartridge; 25-lower cable tie; 26-lower positioning sleeve; 27-pipe flange; 28-connecting pipe; 29-baffle; 30-accumulator. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] See also Figures 1 to 6 A magnetic flap level gauge with a built-in flushing function includes a level gauge body and a float 3 arranged in the level gauge body. The top and bottom of the level gauge body are respectively provided with an exhaust port and a sewage outlet. The upper and lower side walls of the level gauge body are respectively provided with an air inlet and a water inlet, which are used to connect with the accumulator 30 for gas phase and liquid phase respectively, and a display flip column 19 is provided on the level gauge body.

[0031] The liquid level gauge body includes a liquid level gauge main pipe 2, a liquid level gauge auxiliary pipe 14 arranged at the lower end of the liquid level gauge main pipe 2, and a sealing cover 7 arranged at the lower end of the liquid level gauge auxiliary pipe 14. The diameter of the liquid level gauge auxiliary pipe 14 is larger than the diameter of the liquid level gauge main pipe 2. The upper end of the liquid level gauge auxiliary pipe 14 is sleeved on the lower end of the liquid level gauge main pipe 2 and is correspondingly connected to the liquid level gauge main pipe 2 through a horizontally arranged annular connecting plate 15. The water inlet is arranged on the liquid level gauge auxiliary pipe 14, and the sewage outlet is arranged on the sealing cover 7.

[0032] A filter cartridge 24 is provided in the auxiliary pipe 14 of the liquid level gauge, and the upper and lower ends of the filter cartridge 24 are respectively connected to the lower end of the liquid level gauge main pipe 2 and the cover 7, thereby forming an annular accommodating cavity between the filter cartridge 24 and the liquid level gauge auxiliary pipe 14. A plurality of water holes are provided on the surface of the filter cartridge 24 to facilitate the water in the accommodating cavity to enter the filter cartridge 24, and a filter screen 23 is provided on the outer surface of the filter cartridge 24 to intercept iron in the water and prevent iron from entering the filter cartridge 24 and the liquid level gauge main pipe 2.

[0033] like Figure 3As shown, in this embodiment, the filter screen is fixed to the filter cartridge by an upper tie 22 and a lower tie 25. The filter cartridge and filter screen here constitute the filter mechanism 5, which filters the water entering the accommodating chamber from the water inlet, reducing or preventing iron in the water from entering the filter cartridge and then entering the main pipe of the liquid level gauge. This reduces or even prevents the float from adsorbing iron, preventing the float from getting stuck and accurately displaying the water level. It also effectively extends the normal service life of the liquid level gauge and reduces the number of maintenance times.

[0034] During specific implementation, the liquid level gauge auxiliary pipe 14 is made of ferromagnetic material, and the liquid level gauge main pipe 2 and the connecting plate 15 are both made of stainless steel; a coil 10 is provided on the outside of the liquid level gauge auxiliary pipe 14, and the coil 10 is connected to the power supply 12, so that the liquid level gauge auxiliary pipe 14 generates magnetism when power is applied, and then absorbs the iron entering the liquid level gauge auxiliary pipe 14.

[0035] See also Figure 2 In this embodiment, a coil protection cover 11 is also provided on the outside of the coil and is secured to the level gauge auxiliary pipe with screws. The level gauge main pipe and connecting plate are made of stainless steel, which does not attract iron. The level gauge auxiliary pipe is made of ferromagnetic material. During operation, switch 13 is turned on to pass weak current, causing the level gauge auxiliary pipe to become magnetic, attracting iron and further preventing it from entering the level gauge main pipe. When flushing or repairing the level gauge, switch 13 is turned off to demagnetize the pipe, allowing the iron to fall off the pipe, which can then be cleaned.

[0036] In specific implementation, the filter cartridge 24 and the liquid level gauge main pipe 2 are coaxially arranged, the liquid level gauge auxiliary pipe 14 and the filter cartridge 24 are eccentrically arranged, and the distance between the center axis of the liquid level gauge auxiliary pipe 14 and the water inlet is smaller than the distance between the center axis of the filter cartridge 24 and the water inlet.

[0037] The schematic diagram of the eccentric setting of the filter cartridge and the auxiliary pipe of the liquid level gauge is as follows Figure 4 As shown, Figure 4 In the figure, a is the centerline of the level gauge auxiliary tube, b is the centerline of the filter cartridge, and the distance d between the two centerlines is the eccentric distance. This allows the width of the chamber near the water inlet to be larger, effectively reducing the flow rate of water entering the chamber, preventing iron from entering the filter cartridge due to the high water flow rate. It also prolongs the time the level gauge auxiliary tube absorbs iron, enhancing the adsorption effect.

[0038] In specific implementation, an arc-shaped baffle 29 is provided in the accommodating cavity. The baffle 29 is coaxially arranged with the liquid level gauge main pipe 2 and corresponds to the water inlet, so that water enters the accommodating cavity tangentially along both sides of the baffle 29 after entering from the water inlet. The upper end of the baffle 29 is correspondingly connected to the lower surface of the connecting plate 15.

[0039] The central angle of the arc baffle is about 60°. The schematic diagram of water flow in the accommodating cavity is as follows: Figure 5As shown, water enters the accommodating chamber tangentially along both sides of the baffle. Since the filter cartridge and the auxiliary pipe of the liquid level gauge are eccentrically arranged, the flow channel formed in the accommodating chamber changes from large to small, thereby making the flow rate of water in the accommodating chamber more uniform, thereby ensuring the adsorption effect of the auxiliary pipe of the liquid level gauge on iron, and further preventing iron from entering the filter cartridge and the main pipe of the liquid level gauge.

[0040] During specific implementation, an annular collection groove is provided on the upper surface of the cover 7 corresponding to the accommodating cavity. The collection groove is a conical structure with a larger upper part and a smaller lower part. Two flushing ports are provided on the cover corresponding to the collection groove. The two flushing ports are evenly distributed along the collection groove to facilitate the discharge of the collected iron. A flushing valve 8 is provided at each flushing port for opening and closing the flushing port.

[0041] The collection tank is set into a conical structure, which is convenient for collecting iron and facilitating the flushing of iron, so that iron can be flushed out through the collection tank and the flushing port. The two flushing ports can shorten the flushing path of iron and flush iron more quickly.

[0042] In a specific implementation, the auxiliary pipe 14 of the liquid level gauge has a tapered structure that is smaller at the top and larger at the bottom.

[0043] The iron adsorbed on the auxiliary tube of the liquid level gauge is easier to fall into the collection tank after power off and demagnetization, making it easier to flush.

[0044] During specific implementation, the lower end of the liquid level gauge auxiliary pipe 14 has a connecting flange 6, and the sealing cover 7 is fixedly connected to the connecting flange 6 by bolts; the sewage outlet has a conical structure with a larger upper part and a smaller lower part, which facilitates the float 3 to be discharged from the sewage outlet; correspondingly, a bottom cover 9 is provided at the sewage outlet to facilitate closing the sewage outlet.

[0045] During flushing and maintenance, the bottom cover can be opened and the float can be removed from the sewage outlet.

[0046] During specific implementation, the filter cartridge 24 has a conical structure with a larger upper portion and a smaller lower portion. The upper and lower ends of the filter cartridge 24 respectively have a vertically arranged upper positioning sleeve 21 and a lower positioning sleeve 26. The upper positioning sleeve 21 is sleeved on the lower end of the liquid level gauge main pipe 2, thereby realizing the positioning of the upper end of the filter cartridge 24; a positioning cylinder is vertically provided on the sealing cover 7 corresponding to the lower end of the filter cartridge 24, and the lower positioning sleeve 26 is sleeved on the positioning cylinder, thereby realizing the positioning of the lower end of the filter cartridge 24; the sewage outlet is arranged on the inner side of the positioning cylinder.

[0047] The filter cartridge has a conical structure with a larger upper portion and a smaller lower portion. When flushing in the reverse direction from the sewage outlet, the iron on the filter screen can be effectively washed off. In this way, the filter cartridge, the upper positioning sleeve and the lower positioning sleeve are integrally arranged and together with the filter screen form the filter mechanism 5. The entire filter mechanism is an easily replaceable whole.

[0048] During specific implementation, a vertically arranged air pipe 20 is connected to the exhaust port, the upper end of the air pipe 20 is bent and connected to the exhaust port, an exhaust valve 16 is provided at the lower end of the air pipe 20, and a branch pipe is connected to the air pipe 20. The branch pipe is arranged close to the lower end of the air pipe 20, one end of the branch pipe is connected to the air pipe 20, and the other end is provided with a maintenance valve 17 and a pressure gauge 18.

[0049] In this way, when inspection and flushing are required, maintenance personnel can operate while standing on the ground.

[0050] In specific implementation, the water inlet has a horizontally arranged connecting pipe 28, one end of which is inserted into the accommodating cavity and fixed to the liquid level gauge auxiliary pipe 14, and the other end is provided with a pipe flange 27; the inserted end of the connecting pipe 28 has an outlet inclined downward.

[0051] The pipe flange is connected to the accumulator 30 in liquid phase via a liquid-connected pipe. Here, the outlet end of the pipe 28 is tilted downward to avoid material accumulation and prevent the pipe from being blocked.

[0052] See also Figure 6 The liquid level gauge is connected to the accumulator 30 through a gas-connected pipe and a liquid-connected pipe, respectively, for gas and liquid phase connections. A gas-related shutoff valve 1 is provided on the gas-connected pipe, and a liquid-related shutoff valve 4 is provided on the liquid-connected pipe. When flushing and repairing the liquid level gauge, first close the gas-related shutoff valve and the liquid-related shutoff valve, then slowly open the exhaust valve and observe the pressure gauge to maintain an air pressure of approximately 3-5 MPa. Turn off the switch, power off and demagnetize, open the flushing valve, and flush outward under the combined action of gravity and air pressure. The flushing interval is approximately 2-4 times per year, and the filter is effective for a long time. If necessary, the cover can also be removed, and the entire filter mechanism can be removed for cleaning or replacement. To repair the float alone, simply open the bottom cover and remove the float for inspection.

[0053] Finally, it should be noted that the above embodiments of the present invention are merely examples for illustrating the present invention and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations and modifications can be made based on the above description. It is not possible to enumerate all embodiments here. Any obvious variations or modifications arising from the technical solution of the present invention remain within the scope of protection of the present invention.

Claims

1. A magnetic flap level gauge with a self-flushing function, comprising a gauge body and a float disposed within the gauge body. The gauge body is provided with an exhaust port and a sewage outlet at the top and bottom, respectively. The upper and lower sidewalls of the gauge body are provided with an air inlet and a water inlet, respectively, for connecting to an accumulator for gas and liquid phases. The gauge body is provided with a display column. The following features are present: The liquid level gauge body includes a liquid level gauge main pipe, a liquid level gauge auxiliary pipe provided at the lower end of the liquid level gauge main pipe, and a sealing cover provided at the lower end of the liquid level gauge auxiliary pipe. The diameter of the liquid level gauge auxiliary pipe is larger than that of the liquid level gauge main pipe. The upper end of the liquid level gauge auxiliary pipe is sleeved on the lower end of the liquid level gauge main pipe and is correspondingly connected to the liquid level gauge main pipe via a horizontally arranged annular connecting plate. The water inlet is provided on the liquid level gauge auxiliary pipe, and the sewage outlet is provided on the sealing cover. A filter cartridge is provided in the auxiliary pipe of the liquid level gauge. The upper and lower ends of the filter cartridge are respectively connected to the lower end of the liquid level gauge main pipe and the sealing cover, thereby forming an annular accommodating chamber between the filter cartridge and the auxiliary pipe of the liquid level gauge. The surface of the filter cartridge is provided with a plurality of water holes to facilitate the water in the accommodating chamber to enter the filter cartridge, and a filter screen is provided on the outer surface of the filter cartridge to intercept iron in the water and prevent iron from entering the filter cartridge and the liquid level gauge main pipe. The auxiliary pipe of the liquid level gauge is made of ferromagnetic material, and the main pipe and connecting plate of the liquid level gauge are both made of stainless steel; a coil is provided on the outside of the auxiliary pipe of the liquid level gauge, and the coil is connected to a power supply, so that the auxiliary pipe of the liquid level gauge generates magnetism when powered on, and then absorbs the iron entering the auxiliary pipe of the liquid level gauge.

2. A magnetic flap level gauge with self-flushing function according to claim 1, characterized in that: The filter cartridge and the liquid level gauge main pipe are coaxially arranged, the liquid level gauge auxiliary pipe is eccentrically arranged with the filter cartridge, and the distance between the central axis of the liquid level gauge auxiliary pipe and the water inlet is smaller than the distance between the central axis of the filter cartridge and the water inlet.

3. The magnetic flap level gauge with self-flushing function according to claim 2, characterized in that: An arc-shaped baffle is provided in the accommodating cavity. The baffle is coaxially arranged with the liquid level gauge main pipe and corresponds to the water inlet, so that water enters the accommodating cavity tangentially along both sides of the baffle after entering from the water inlet. The upper end of the baffle is correspondingly connected to the lower surface of the connecting plate.

4. The magnetic flap level gauge with self-flushing function according to claim 3, characterized in that: An annular collection groove is provided on the upper surface of the cover corresponding to the accommodating cavity. The collection groove is a conical structure with a larger upper part and a smaller lower part. Two flushing ports are provided on the cover corresponding to the collection groove. The two flushing ports are evenly distributed along the collection groove to facilitate the discharge of the collected iron. A flushing valve is provided at each flushing port for opening and closing the flushing port.

5. The magnetic flap level gauge with self-flushing function according to claim 4, characterized in that: The auxiliary pipe of the liquid level gauge is in a tapered structure that is smaller at the top and larger at the bottom.

6. The magnetic flap level gauge with self-flushing function according to claim 1, characterized in that: The lower end of the auxiliary pipe of the liquid level gauge is provided with a connecting flange, and the sealing cover is fixedly connected to the connecting flange by bolts; the sewage outlet is in a conical structure with a larger upper portion and a smaller lower portion, which facilitates the float to be discharged from the sewage outlet; correspondingly, a bottom cover is provided at the sewage outlet to facilitate the sealing of the sewage outlet.

7. The magnetic flap level gauge with self-flushing function according to claim 6, characterized in that: The filter cartridge has a conical structure that is larger at the top and smaller at the bottom. The upper and lower ends of the filter cartridge are respectively provided with a vertically arranged upper positioning sleeve and a lower positioning sleeve. The upper positioning sleeve is arranged on the lower end of the liquid level gauge main pipe to achieve the positioning of the upper end of the filter cartridge; a positioning cylinder is vertically provided on the sealing cover corresponding to the lower end of the filter cartridge, and the lower positioning sleeve is arranged on the positioning cylinder to achieve the positioning of the lower end of the filter cartridge; the sewage outlet is arranged on the inner side of the positioning cylinder.

8. The magnetic flap level gauge with self-flushing function according to claim 1, characterized in that: The exhaust port is connected to a vertical air pipe, the upper end of the air pipe is bent and connected to the exhaust port, the lower end of the air pipe is provided with an exhaust valve, and a branch pipe is connected to the air pipe. The branch pipe is arranged close to the lower end of the air pipe, one end of the branch pipe is connected to the air pipe, and the other end is provided with an inspection valve and a pressure gauge.

9. The magnetic flap level gauge with self-flushing function according to claim 1, characterized in that: The water inlet has a horizontally arranged connecting pipe, one end of which is inserted into the accommodating cavity and fixed to the auxiliary pipe of the liquid level gauge, and the other end is provided with a pipe flange; the inserted end of the connecting pipe has an outlet inclined downward.

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