Water level automatic control switch for pump

Abstract

The utility model discloses a pump water level automatic control switch which comprises a switch body and an opening and closing mechanism, a switch cavity is formed in the switch body, and the opening and closing mechanism is arranged in the switch cavity; the opening and closing mechanism comprises a switch, a swing arm, a floater and a lifting rod, the swing arm is in a U shape, one end of the swing arm is connected with a switch body, the other end of the swing arm is in a U shape and can be connected with the lifting rod in a magnetic attraction mode, the swing arm can trigger the switch to achieve opening and closing of the water level automatic control switch, and the lifting rod is connected with the floater. The water level automatic control switch has the effects of reducing the space occupied by the water level automatic control switch and enhancing the switching-on accuracy of the water level automatic control switch.

Description

Technical Field

[0001] The present application relates to the field of submersible pump technology, and in particular to an automatic water level control switch for a pump. Background Art

[0002] During the use of the submersible pump, a water level automatic switch is required to automatically control the start and stop of the pump. Although the commonly used float switch type water level automatic switch is relatively economical, it occupies a large space. It is necessary to consider how to optimize the arrangement of components in the float switch type water level automatic switch and increase the universality of the use scenarios of the float switch type water level automatic switch. In addition, for the water level automatic switch, sometimes its internal structure is sometimes affected by the water quality. It is also necessary to consider how to eliminate the influence of water quality on the water level automatic switch, and at the same time ensure that it will not affect the accuracy of the normal operation of the water level automatic switch.

[0003] In order to reduce the space occupied by the automatic water level control switch and enhance the accuracy of opening the automatic water level control switch, we propose an automatic water level control switch for a pump. Utility Model Content

[0004] In order to reduce the space occupied by the automatic water level control switch and enhance the accuracy of opening the automatic water level control switch, the present application provides an automatic water level control switch for a pump.

[0005] The present application provides a pump water level automatic control switch adopts the following technical solution:

[0006] A pump water level automatic control switch, characterized in that it includes a switch body and an opening and closing mechanism, the switch body is provided with a switch cavity, and the opening and closing mechanism is arranged in the switch cavity; the opening and closing mechanism includes a switch, a swing arm, a float and a lifting rod, the swing arm is "U"-shaped, one end of the swing arm is connected to the switch body, and the other end is "U"-shaped and can be magnetically connected to the lifting rod, and the swing arm can trigger the switch to realize the opening and closing of the water level automatic control switch, and the lifting rod is connected to the float.

[0007] By adopting the above technical scheme, the float of the opening and closing mechanism rises with the rise of the ambient water level of the water level automatic control switch, so that the lifting rod on the float rises with the rise of the float. When the ambient water level of the float reaches the preset start-up water level, the lifting rod and the swing arm are magnetically attracted. The magnetic connection is actually a connection relationship of "like repels like and opposites attract" through magnetic lines of force. In actual use, they are not fitted together, so that the swing arm rotates around the switch body, and then the swing arm triggers the switch to turn on, so that the submersible pump starts working, and then the ambient water level of the water level automatic control switch continues to drop. When the lifting rod is magnetically connected to the swing arm, the swing arm is in a "U" shape and can be connected to the lifting rod, which is beneficial to reduce the obstruction of the swing arm between the switch and the lifting rod, so that there is no other obstruction between the lifting rod and the switch. His device allows the lifting rod and the switch to be set close to each other, so there is no need to leave a gap between the lifting rod and the switch, so that the space volume occupied by the lifting rod, the switch and the swing arm as a whole is reduced. By reducing the swing arm part between the switch and the magnet cavity, the layout of the switch, the swing arm and the magnet cavity is optimized. Moreover, since the swing arm is "U"-shaped around the lifting rod, the thickness of the contact surface between the swing arm and the switch can be appropriately increased without reducing the thickness of the swing arm considering the rotation problem of the swing arm between the lifting rod and the switch. In this way, the pressing force of the button on the switch by the swing arm is enhanced, and the strength of the switch driven by the swing arm is increased. When the water level of the float environment drops, the lifting rod and the swing arm are gradually magnetically attracted away, and the swing arm resets the switch, causing the submersible pump to stop.

[0008] Preferably, the swing arm and the lifting rod are arranged perpendicularly.

[0009] Preferably, the switch cavity comprises a first cavity and a second cavity, the switch and the swing arm are arranged in the first cavity, the float and the lifting rod are arranged in the second cavity, and the first cavity is at least partially located on the outer wall of the second cavity.

[0010] Preferably, the switch body is provided with a guide column at the position of the second cavity, the float is provided with a hole, and the guide column is connected to the hole to limit the movement range of the float.

[0011] Preferably, the guide column includes a fixed column and a shift rod, the shift rod is rotatably connected to the fixed rod, a first protrusion is provided on the shift rod, the float is provided with a first groove at the hole, and the first protrusion can cooperate with the first groove.

[0012] Preferably, the switch cavity includes a float cavity, the float is located in the float cavity, and the pump water level automatic control switch also includes a pressure control mechanism, the pressure control mechanism includes an air intake channel and a one-way valve, one end of the air intake channel is connected to the upper side of the float cavity, and the other end is connected to the outside world, and the one-way valve is arranged on the air intake channel.

[0013] Preferably, the one-way valve is a rubber sheet.

[0014] Preferably, the lifting rod is provided with a magnetic head, which is called magnet No. 2, and the swing arm is also provided with a magnetic head, which is called magnet No. 1, so that when magnet No. 2 approaches magnet No. 1, the interaction between the magnetic heads can drive the swing arm to move.

[0015] Preferably, the magnetic head on the lifting rod is called magnet No. 2, and the magnetic head on the swing arm can be divided into two parts, respectively called magnet No. 1 and magnet No. 3, and the magnet No. 1 and the magnet No. 3 are respectively located on both sides of the rising path of the magnet No. 2; the end of the magnet No. 1 close to the magnet No. 2 has the same magnetic property as the magnet No. 2, and the end of the magnet No. 3 close to the magnet No. 2 has a different magnetic property from the magnet No. 2; the end of the magnet No. 1 close to the magnet No. 2 has a different magnetic property from the magnet No. 2, and the end of the magnet No. 3 close to the magnet No. 2 has the same magnetic property as the magnet No. 2; the position of the magnet No. 1 can be interchanged with that of the magnet No. 3.

[0016] Preferably, a spring sheet is provided on the switch body.

[0017] In summary, the present application includes at least one of the following beneficial technical effects:

[0018] 1. The swing arm is in a "U" shape and can be connected to the lifting rod, which is conducive to reducing the obstruction of the swing arm between the switch and the lifting rod, so that there is no other device between the lifting rod and the switch, so that the lifting rod and the switch can be set close to each other, and there is no need to deliberately leave a gap between the lifting rod and the switch, so that the space volume occupied by the lifting rod, the switch and the swing arm as a whole is reduced. By reducing the swing arm part between the switch and the magnet cavity, the layout of the switch, the swing arm and the magnet cavity is optimized;

[0019] 2. Since the swing arm is "U"-shaped and surrounds the lifting rod, the thickness of the contact surface between the swing arm and the switch can be appropriately increased without reducing the thickness of the swing arm considering the rotation problem of the swing arm between the lifting rod and the switch. In this way, the pressing force of the button on the switch by the swing arm is enhanced, and the strength of the switch driven by the swing arm is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a cross-sectional view of the automatic water level control switch for the pump in this embodiment;

[0021] Figure 2 This is a bottom view of the automatic water level control switch for the pump in this embodiment;

[0022] Figure 3 It is a cross-sectional view of the automatic water level control switch for the pump in this embodiment.

[0023] Figure numerals: 1. switch body; 2. pressure control mechanism; 3. opening and closing mechanism; 4. switch cavity; 5. switch; 6. swing arm; 7. float; 8. lifting rod; 9. first cavity; 10. second cavity; 11. guide column; 12. hole; 13. fixing column; 14. lever; 15. first protrusion; 16. first groove; 17. air inlet channel; 18. one-way valve; 19. magnetic head; 20. No. 2 magnet; 21. No. 1 magnet; 22. No. 3 magnet; 23. switch button; 24. spring; 25. float cavity; 26. magnet cavity; 27. switch water inlet; 28. switch air inlet. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-3 This application is described in further detail.

[0025] The embodiment of the present application discloses an automatic water level control switch for a pump.

[0026] Reference Figure 1 , Figure 2 and Figure 3 , including a switch body 1, an opening and closing mechanism 3 and a pressure control mechanism 2. A switch cavity 4 is opened in the switch body 1. The switch cavity 4 has a switch water inlet 27. The opening and closing mechanism 3 is arranged in the switch cavity 4, and the pressure control mechanism 2 is arranged on the switch body 1.

[0027] The switch cavity 4 includes a first cavity 9 and a second cavity 10. The first cavity 9 is located at the upper part of the switch body 1, and the second cavity 10 is located at the lower part of the switch body 1. The second cavity 10 includes a float cavity 25 and a magnet cavity 26. The float cavity 25 is connected to the magnet cavity 26, and part of the first cavity 9 is located at the outer wall of the magnet cavity 26.

[0028] The opening and closing mechanism 3 includes a switch 5, a swing arm 6, a lifting rod 8 and a float 7. The switch 5 and the swing arm 6 are arranged in a first cavity 9. The switch 5, the swing arm 6, the lifting rod 8 and the float 7 are separated by the first cavity 9, so as to reduce the influence of the environmental water level of the lifting rod 8 and the float 7 on the switch 5 and the swing arm 6, and effectively increase the service life of the automatic water level switch. The swing arm 6 is in a "U" shape, one end of the swing arm is rotatably connected to the switch body 1, and the other end of the swing arm 6 is in a "U" shape, and the side wall of the swing arm can trigger the opening and closing of the switch 5. The switch includes a switch button 23, and the switch button 23 is located on one side of the micro-motion body, so that the swing arm 6 can be pressed to turn on the switch button 23 after rotating around the switch body 1, thereby putting the submersible pump in the starting state. The swing arm 6 is symmetrically plugged with magnetic suction heads 19 on both sides of the "U" shape, and the magnetic suction heads 19 are respectively called No. 1 magnet 21 and No. 3 magnet 22, so that the No. 1 magnet 21 and the No. 3 magnet 22 are respectively located in the magnet cavity 2 6, compared with the inverted "Y"-shaped swing arm 6, the "U"-shaped swing arm 6 is conducive to reducing the obstruction of the swing arm 6 between the switch 5 and the magnet cavity 26, so that there is no other device between the magnet cavity 26 and the switch 5, so that the magnet cavity 26 and the switch 5 can be set in close distance, and there is no need to deliberately leave a gap between the magnet cavity 26 and the switch 5, so that the space volume occupied by the magnet cavity 26, the switch 5 and the swing arm 6 is reduced, and the layout of the switch 5, the swing arm 6 and the magnet cavity 26 is optimized by reducing the portion of the swing arm 6 between the switch 5 and the magnet cavity 26. In addition, since the "U" shape of the swing arm 6 surrounds the outer wall of the magnet cavity 26, the thickness of the contact surface between the swing arm 6 and the switch 5 can be appropriately increased, and there is no need to consider the rotation problem of the swing arm 6 between the magnet cavity 26 and the switch 5 and reduce the thickness of the swing arm 6, thereby enhancing the pressing force of the button on the switch 5 by the swing arm 6.

[0029] The switch body 1 is provided with a guide column 11 at the float cavity 25, and the guide column 11 includes a fixed column 13 and a lever 14. The fixed column 13 is integrally connected to the float cavity 25 of the switch body 1, and the lever 14 is rotatably connected to the end of the fixed column 13 away from the magnet cavity 26. The outer wall of the lever 14 is integrally connected with a first protrusion 15. The float 7 is provided with a hole 12, and the float 7 is provided with a first groove 16 on the side wall of the hole 12, so that the float 7 will correspond the first groove 16 to the first protrusion 15. 5 is sleeved on the fixed column 13 and the lever 14, and then the user rotates the lever 14 to make the first protrusion 15 staggered with the first groove 16 of the float 7, so that the float 7 is limited on the guide column 11. The fixed column 13 and the lever 14 jointly limit the radial displacement of the float 7, so that the float 7 can only move up and down along the guide column 11, and the first protrusion 15 on the lever 14 and the upper wall of the float cavity 25 limit the axial position of the float 7, so that the float 7 has limited displacement in the axial direction.

[0030] The lifting rod 8 is glued to the upper side of the float 7, and a magnetic head 19 is also inserted on the upper side of the lifting rod 8. The magnetic head 19 is called the No. 2 magnet 20. The No. 2 magnet 20 is located in the magnet cavity 26, and the end of the No. 1 magnet 21 close to the No. 2 magnet 20 has the same magnetic property as the No. 2 magnet 20, and the end of the No. 3 magnet 22 close to the No. 2 magnet 20 has a different magnetic property from the No. 2 magnet 20. The float 7 is filled with a counterweight, so that when the lifting rod 8 and the No. 2 magnet 20 are located on the upper side of the float 7, the float 7 continues to keep the lifting rod 8 located at the top without tipping over. The float 7 floats up and down along the float cavity 25, and the No. 2 magnet 20 floats up and down along the magnet cavity 26, so that the No. 2 magnet 20 can be located between the No. 1 magnet 21 and the No. 3 magnet 22, so that the "U" shape of the swing arm can be magnetically connected to the lifting rod. The magnetic connection is actually a relationship of "like repels like and opposites attract" through magnetic lines of force, and they are not fitted together during actual use.

[0031] The swing arm 6 and the lifting rod 8 are arranged perpendicular to each other, that is, the float 7 and the lifting rod 8 are installed in the second cavity 10 of the switch body along the vertical direction, and the switch 5 and the swing arm 6 are installed horizontally in the first cavity 9 of the switch body. Since the float 7 itself has a certain volume and is usually flat, it is beneficial to unify the overall shape of the opening and closing mechanism 3 by setting the switch 5 and the swing arm 6 to be flat. By setting the switch 5 part to a flat shape similar to the float 7, it is beneficial to reduce the axial space requirement of the overall opening and closing mechanism 3. Due to the close arrangement of the switch 5, the swing arm 6 and the magnet cavity 26, the space occupied by the automatic water level control switch is reduced.

[0032] The pressure control mechanism 2 includes an air inlet channel 17 and a one-way valve 18. The upper portion of the air inlet channel 17 is in an inverted "U" shape. One end of the inverted "U" shape of the air inlet channel 17 is connected to the upper side of the float cavity 25, and the other end is connected to the outside. The end of the air inlet channel 17 connected to the outside is called a switch air inlet 28. The horizontal plane at the position of the switch air inlet 28 is higher than the horizontal plane at the position of the switch water inlet 27, so that after the switch air inlet 28 has begun to take air into the float cavity 25, the second cavity 10 can also be opened through the lower portion of the float cavity 25. In the water-sealed state, the inverted "U"-shaped air inlet channel 17 facilitates the exhaust of the gas in the float cavity 25 as much as possible, and facilitates the gas in the air inlet channel 17 to enter the float cavity 25, without having to worry about the water in the air inlet channel 17 or the float cavity 25 affecting the gas exchange. The one-way valve 18 is installed at the upper end of the inverted "U"-shaped air inlet channel 17. The one-way valve 18 allows the gas in the air inlet channel 17 and the float 7 switch to reach the external environment through the one-way valve 18, while the gas in the external environment cannot enter through the one-way valve 18.

[0033] In this way, when the ambient water level of the automatic water level control switch gradually rises, and before the switch air inlet 28 is water-sealed, the ambient water level in the float cavity 25 rises with the ambient water level of the automatic water level control switch, and the float 7 rises along the guide column 11 direction with the ambient water level in the float cavity 25, and drives the second magnet to rise along the guide column 11 direction in the magnet cavity 26. After the switch air inlet 28 is water-sealed, the gas in the float cavity 25 is discharged from the float cavity 25 through the one-way valve 18, so that the ambient water level in the float cavity 25 still rises with the ambient water level of the automatic water level control switch; when the ambient water level of the automatic water level control switch reaches the preset start-up water level, the second magnet in the magnet cavity 26 also rises between the first magnet and the third magnet, so that the swing arm 6 rotates due to the interaction between the magnets, and then drives the swing arm 6 to press the switch button 23 of the switch 5, so that the submersible pump is in working state; the submersible pump is turned on After working, the environmental water level of the submersible pump will continue to drop. Before the environmental water level of the water level automatic control switch unseals the switch air inlet 28, the air pressure in the float cavity 25 is maintained, so the environmental water level in the float cavity 25 is always maintained, so that the submersible pump continues to work; after the environmental water level of the submersible pump continues to drop and the switch air inlet 28 is unsealed, due to the principle of communicating vessels, the environmental water level in the float cavity 25 gradually drops, and due to the magnetic attraction of the second magnet 20 and the first magnet 21 and the third magnet 22, when the second magnet 20 moves away from the first magnet and the third magnet 22 as the float 7, the swing arm 6 can also rotate to press the switch button 23 for a period of time, so that the submersible pump can continue to work for a period of time, thereby making the submersible pump have a lower shutdown water level, which can be as low as 1mm, and when the swing arm 6 is reset, the reset of the swing arm 6 drives the reset of the switch button 23, so that the submersible pump is in the shutdown position, thereby realizing automatic control of the water level.

[0034] Furthermore, in the present embodiment, further, in the present embodiment, a bracket may be provided between the swing arm 6 and the switch body 1, so that the switch body 1 is connected to the swing arm 6 through the bracket, and the switch body 1 can cooperate with the installation of the swing arm 6 of different heights through the bracket, so as to adjust the strength and position of the magnet action between the swing arm 6 and the lifting rod 8, thereby increasing the universal applicability of the water level control switch, and the bracket also allows the installation position of the swing arm 6 to have a greater degree of freedom.

[0035] Furthermore, in the present embodiment, the one-way valve 18 is a rubber sheet, and a one-way valve channel is provided on the air inlet channel 17, so that the inner wall of the one-way valve channel is provided with a one-way valve inner protrusion, and the lower end of the rubber sheet is integrally connected with a connecting piece for connecting with the one-way valve inner protrusion, and the rubber sheet is placed on the upper side of the one-way valve channel, so that the rubber sheet covers the one-way valve channel and is hooked with the one-way valve inner protrusion through the connecting piece, so that when outside air wants to enter the one-way valve 18, the outside air will only squeeze the rubber sheet covering the surface of the one-way valve channel, so that the one-way valve channel is more tightly sealed by the rubber sheet, and when the gas in the second cavity 10 wants to reach the outside through the one-way valve 18, the air pressure in the second cavity 10 drives the rubber sheet to deform, so that the rubber sheet deforms upward with a gap, thereby allowing the gas in the second cavity 10 to overflow, and after the gas in the second cavity 10 stops overflowing, the rubber sheet returns to its original position to seal the one-way valve channel.

[0036] Furthermore, in the present embodiment, a spring piece 24 is inserted into one side of the switch body 1. During the installation of the automatic water level control switch, one end of the automatic water level control switch is quickly limited by the spring piece 24, which effectively increases the convenience of producing the automatic water level control switch. When the automatic water level control switch needs to be disassembled and repaired, the user first removes the end of the automatic water level control switch away from the spring piece 24, and then realizes the quick removal of the end of the spring piece 24, so that the automatic water level control switch has the characteristics of quick removal and quick installation.

[0037] Furthermore, in the present embodiment, the one-way valve 18 may also be in other forms. For example, the one-way valve 18 is a diaphragm, and the diaphragm covers the upper side of the one-way valve channel. The diaphragm seals the one-way valve 18 channel under the action of gravity. The diaphragm has a connector for connecting to the inner protrusion of the one-way valve, and the connector is located under the inner protrusion of the one-way valve, so that after the diaphragm moves upward, the connector is hooked with the inner protrusion of the one-way valve to limit the axial displacement of the diaphragm, so that when the gas in the second cavity 10 wants to reach the outside through the one-way valve 18, the air pressure in the second cavity 10 squeezes the diaphragm, so that the one-way valve 18 channel is more tightly sealed by the diaphragm. When the gas in the second cavity 10 wants to reach the outside through the one-way valve 18, the air pressure in the second cavity 10 drives the diaphragm to move upward, and after the diaphragm moves upward to a certain position, the connector of the diaphragm is hooked with the inner protrusion of the one-way valve, thereby limiting the position of the diaphragm, and after the gas in the second cavity 10 stops overflowing, the diaphragm returns to its original position to seal the one-way valve channel.

[0038] Furthermore, in this embodiment, the one-way valve 18 may also adopt other mechanical or electronic structures, so that the gas in the second cavity 10 can be discharged to the outside, while the outside gas cannot enter the second cavity 10.

[0039] Furthermore, in the present embodiment, the opening and closing mechanism 3 may also adopt other structures, and it is only necessary that the opening and closing mechanism 3 can change the opening and closing state through the magnetic connection between the float 7 and the switch 5 .

[0040] Furthermore, in this embodiment, the switch 5 can be turned on not only by the switch button 23, but also by a push rod, a slide rod, a contact, etc.

[0041] Furthermore, in this embodiment, the swing arm 6 can be rotated by having one end of the No. 1 magnet 21 close to the No. 2 magnet 20 having a different magnetic property from the No. 2 magnet 20, and one end of the No. 3 magnet 22 close to the No. 2 magnet 20 having the same magnetic property as the No. 2 magnet 20, thereby driving the magnet assembly to turn on the switch 5.

[0042] Furthermore, in this embodiment, the position of the No. 1 magnet and the No. 3 magnet 22 can be interchanged.

[0043] Furthermore, in this embodiment, the pressure control mechanism 2 can also control the air pressure in the switch cavity 4 through an air pump, an electrically opened and closed air inlet, etc., thereby controlling the water level in the switch cavity 4.

[0044] Furthermore, in this embodiment, a protrusion is integrally connected to the upper side of the float cavity 25, so that when the float 7 rises to the upper wall of the float cavity 25, the float 7 will not be unable to float up and down with the water level due to static friction or other forces between it and the upper wall of the float cavity 25.

[0045] The implementation principle of a pump water level automatic control switch disclosed in the embodiment of the present application is as follows: the "U"-shaped swing arm 6 is conducive to reducing the obstruction of the swing arm 6 between the switch 5 and the magnet cavity 26, so that there is no other device between the magnet cavity 26 and the switch 5, so that the magnet cavity 26 and the switch 5 can be set in close proximity, and there is no need to deliberately leave a gap between the magnet cavity 26 and the switch 5, so that the space volume occupied by the magnet cavity 26, the switch 5 and the swing arm 6 is reduced, and by reducing the portion of the swing arm 6 between the switch 5 and the magnet cavity 26, the layout of the switch 5, the swing arm 6 and the magnet cavity 26 is optimized, and because the swing arm 6 is "U"-shaped and surrounds the outer wall of the magnet cavity 26, the thickness of the contact surface between the swing arm 6 and the switch 5 can be appropriately increased, and there is no need to consider the rotation problem of the swing arm 6 between the magnet cavity 26 and the switch 5 and reduce the thickness of the swing arm 6, thereby enhancing the pressing force of the button on the switch 5 by the swing arm 6.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pump water level automatic control switch, characterized in that: It comprises a switch body (1) and an opening and closing mechanism (3), wherein a switch cavity (4) is provided on the switch body (1), and the opening and closing mechanism (3) is arranged in the switch cavity (4); The opening and closing mechanism (3) comprises a switch (5), a swing arm (6), a float (7) and a lifting rod (8); the swing arm (6) is in a "U" shape; one end of the swing arm (6) is connected to the switch body (1); the other end is in a "U" shape and can be magnetically connected to the lifting rod (8); the swing arm (6) can trigger the switch (5) to realize the opening and closing of the water level automatic control switch; the lifting rod (8) is connected to the float (7).

2. The pump water level automatic control switch according to claim 1, characterized in that: The swing arm (6) and the lifting rod (8) are arranged vertically.

3. The pump water level automatic control switch according to claim 1, characterized in that: The switch cavity (4) comprises a first cavity (9) and a second cavity (10); the switch (5) and the swing arm (6) are arranged in the first cavity (9); the float (7) and the lifting rod (8) are arranged in the second cavity (10); and the first cavity (9) is at least partially located at the outer wall of the second cavity (10).

4. The pump water level automatic control switch according to claim 3 is characterized in that: The switch body (1) is provided with a guide column (11) at the position of the second cavity (10), the float (7) is provided with a hole (12), and the guide column (11) is connected to the hole (12) to limit the movement range of the float (7).

5. The pump water level automatic control switch according to claim 4, characterized in that: The guide column (11) comprises a fixed column (13) and a lever (14), the lever (14) being rotatably connected to the fixed column (13), the lever (14) being provided with a first protrusion (15), the float (7) being provided with a first groove (16) at the hole (12), and the first protrusion (15) being capable of cooperating with the first groove (16).

6. The automatic water level control switch for pumps according to claim 1, characterized in that: The switch cavity (4) comprises a float cavity (25), the float (7) is located in the float cavity (25), and the pump water level automatic control switch also comprises a pressure control mechanism (2), the pressure control mechanism (2) comprises an air intake channel (17) and a one-way valve (18), one end of the air intake channel (17) is connected to the upper side of the float cavity (25), and the other end is connected to the outside, and the one-way valve (18) is arranged on the air intake channel (17).

7. The pump water level automatic control switch according to claim 6, characterized in that: The one-way valve (18) is a rubber sheet.

8. The automatic water level control switch for pumps according to claim 1, characterized in that: The lifting rod (8) has a magnetic head (19), and the magnetic head (19) on the lifting rod (8) is called the second magnet (20). The swing arm (6) also has a magnetic head (19), and the magnetic head (19) on the swing arm (6) is called the first magnet (21), so that when the second magnet (20) approaches the first magnet (21), the magnetic heads (19) interact with each other to drive the swing arm (6) to move.

9. The automatic water level control switch for pumps according to claim 8, characterized in that: The magnetic head (19) on the lifting rod (8) is called the second magnet (20). The magnetic head (19) on the swing arm (6) can be divided into two parts, respectively called the first magnet (21) and the third magnet (22). The first magnet (21) and the third magnet (22) are respectively located on both sides of the ascending path of the second magnet (20); the end of the first magnet (21) close to the second magnet (20) has the same magnetic property as the second magnet (20), and the end of the third magnet (22) close to the second magnet (20) has a different magnetic property from the second magnet (20); the end of the first magnet (21) close to the second magnet (20) has a different magnetic property from the second magnet (20), and the end of the third magnet (22) close to the second magnet (20) has the same magnetic property as the second magnet (20); the position of the first magnet (21) and the third magnet (22) can be interchanged.

10. The pump water level automatic control switch according to claim 1, characterized in that: The switch body (1) is provided with a spring sheet (24).

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