An explosion-proof motor with a sealed, low-noise structure

Abstract

The application relates to the technical field of explosion-proof motors, in particular to an explosion-proof motor with a sealed low-noise structure, which comprises a motor body, a sealing mechanism and a damping mechanism, the sealing mechanism comprises a cover body, an end cover, a floating seat and a fluff structure, the end cover is detachably connected at both ends of the cover body; the end cover is detachably connected on the floating seat; the fluff structure is arranged on the inner wall of the cover body; the motor body is installed on the floating seat; the damping mechanism comprises a water tank, a base, a sleeve, a pressing rod, a spring A, a ball A and a ball B; the base is arranged inside the water tank, a plurality of ball grooves A are formed in the base; the ball A is rollingly arranged on the inner side of the ball groove A and connected with the sleeve; the pressing rod is slidably arranged on the inner side of the sleeve and connected with the sleeve through the spring A; a plurality of ball grooves B are formed in the bottom end of the floating seat; the ball B is rollingly arranged on the inner side of the ball groove B and connected with the pressing rod. The motor body is comprehensively sealed and vibration-damped, cold water is used in cooperation with the fluff structure, and the heat dissipation and noise reduction functions of the motor body are realized.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof motor technology, and specifically to an explosion-proof motor with a sealed, low-noise structure. Background Technology

[0002] Explosion-proof motors are special motors designed for flammable and explosive environments (such as petroleum, chemical, and coal mines). Their core design objective is to prevent internal sparks, arcs, or high temperatures from igniting surrounding explosive gases or dust.

[0003] Chinese patent CN118826356B discloses an explosion-proof motor with a sealed, low-noise structure. By mounting the explosion-proof motor on a mounting plate, when the motor vibrates, the mounting plate vibrates up and down, causing the first spring and the shock absorber to reciprocate and compress, effectively dissipating the vibration force generated by the explosion-proof motor. This prevents the vibration generated by the explosion-proof motor from colliding with the mounting base, thus reducing noise. At the same time, it provides a synchronous sealing effect at the connection between the connecting pipe and the connection port on the outer wall of the explosion-proof motor.

[0004] However, the aforementioned existing technologies have the following drawbacks: the vibration of explosion-proof motors is multi-directional, and the existing technologies can only effectively dissipate the vibration force in the vertical direction, while the vibration force in other directions cannot be effectively dissipated, resulting in a significant reduction in the actual noise reduction effect; in addition, the sealing structure of the existing technologies can only seal the connection between the connecting pipe and the connection port set on the outer wall of the explosion-proof motor, and cannot completely seal the explosion-proof motor. When the explosion-proof motor is used in a coal mine, coal dust can easily enter the inside of the motor and accumulate on the surface of the motor, which not only affects the heat dissipation of the motor, but also poses certain safety hazards. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing an explosion-proof motor with a sealed and low-noise structure.

[0006] The technical solution of the present invention: an explosion-proof motor with a sealed and low-noise structure, comprising a motor body, and further comprising:

[0007] A sealing mechanism includes a cover, end caps, a float seat, pipe a, pipe b, a pump body, elastic membrane a, elastic membrane b, and a fleece structure. Two end caps are detachably connected to both ends of the cover. The end caps are detachably connected to the float seat. A water storage chamber is provided inside the cover, and a through-hole is provided on the cover. Elastic membrane a is located on the inner wall of the inlet. An opening communicating with the water storage chamber is provided on the cover. Elastic membrane b is located on the opening. The fleece structure is located on the inner wall of the cover and extends to the inner side of the water storage chamber. The motor body is mounted on the float seat and located inside the cover. The pump body is located on the float seat and communicates with the water storage chamber through pipe a. Pipe b communicates with the water storage chamber and is equipped with a pressure relief valve; one end of pipe b extends to the inner side of the water tank.

[0008] The shock absorption mechanism includes a water tank, a base, a sleeve, a pressure rod, a spring a, a ball a, and a ball b. The water tank contains cold water. The float floats on the water surface. The base is located inside the water tank and has multiple ball grooves a. Ball a rolls inside the ball groove a. Ball a is connected to the sleeve. The pressure rod slides inside the sleeve and is connected to the bottom of the sleeve via spring a. The bottom of the float has multiple ball grooves b. Ball b rolls inside the ball groove b and is connected to the pressure rod.

[0009] Preferably, the pile structure is made of thermally conductive carbon fiber and sound-absorbing cotton strips.

[0010] Preferably, the cover is equipped with an atomizing nozzle that communicates with the water storage chamber.

[0011] Preferably, a baffle is connected to the outer periphery of the float seat; a groove a is opened at the top of the water tank; a surrounding plate is slidably provided inside the groove a; and a spring b is connected between the surrounding plate and the bottom of the inner side of the groove a.

[0012] Preferably, the base is provided with a telescopic component; a plate a is connected to the telescopic component; a circular opening is provided on the plate a, a sleeve passes through the circular opening, and a sealing ring is slidably provided on the sleeve; an elastic membrane c is connected between the sealing ring and the inner wall of the circular opening.

[0013] Preferably, the outer peripheral surface of plate a and the inner wall of the sealing ring are provided with a rubber layer to enhance the sealing performance.

[0014] Preferably, a liquid level sensor is floating on the water surface inside the water tank to monitor the water level height.

[0015] Preferably, the outer surface of the water tank is equipped with a controller to receive feedback signals from the liquid level sensor, and an alarm is installed on the water tank; the liquid level sensor establishes an information transmission connection with the telescopic component and the alarm.

[0016] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects:

[0017] By incorporating a cover and a fleece structure, the motor body is fully sealed while the cold water inside the cover, in conjunction with the fleece structure, facilitates heat dissipation. Additionally, the dense fleece structure, combined with the cold water, absorbs most of the noise generated during motor operation, thus reducing noise.

[0018] By incorporating a float, water tank, pressure rod, spring A, and sleeve, the pressure rod and sleeve will respond accordingly (tilting and telescopic movements) when the motor body vibrates in multiple directions. With the buffering effect of water and spring A, the vibration force of the motor body can be buffered. At the same time, water can act as a damper to prevent spring A from aggravating the vibration frequency of the motor body, ensuring that the vibration force of the motor body can be effectively absorbed and buffered. Attached Figure Description

[0019] Figure 1 This is a perspective view of one embodiment of the present invention;

[0020] Figure 2 This is a structural schematic diagram of the water tank in cross-sectional state in one embodiment of the present invention;

[0021] Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle;

[0022] Figure 4 This is a schematic cross-sectional view of the cover body when the end cap is separated from the cover body in one embodiment of the present invention;

[0023] Figure 5 for Figure 4 Enlarged structural diagram at point C;

[0024] Figure 6 This is a schematic diagram of the structure when the end cap and the cover are separated and the pump body is exposed in one embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure when plate a separates from the sleeve and ball a separates from the ball groove a in one embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the cross-sectional structure of the pressure rod, sleeve, and ball a in one embodiment of the present invention, showing the plate a and the base in cross-sectional state.

[0027] Figure 9 for Figure 8 Enlarged structural diagram at point B.

[0028] Reference numerals in the attached drawings: 1. Cover; 101. End cap; 102. Elastic membrane a; 103. Elastic membrane b; 2. Floating seat; 201. Ball groove b; 3. Atomizing nozzle; 4. Baffle; 5. Water tank; 6. Pressure relief valve; 7. Pipe b; 8. Inlet; 9. Base; 901. Ball groove a; 10. Plate a; 11. Elastic membrane c; 12. Sleeve; 13. Pressure rod; 14. Spring b; 15. Sealing ring; 16. Telescopic component; 17. Ball b; 18. Flocked structure; 19. Pump body; 20. Ball a; 21. Pipe a; 22. Enclosure; 23. Spring a; 24. Motor body. Detailed Implementation

[0029] Example 1, as Figures 1-6 as well as Figure 9 As shown, the explosion-proof motor with a sealed and low-noise structure proposed in this invention includes a motor body 24, as well as a sealing mechanism and a shock-absorbing mechanism.

[0030] The sealing mechanism includes a cover 1, end caps 101, a float seat 2, pipe a21, pipe b7, a pump body 19, elastic membrane a102, elastic membrane b103, and a fleece structure 18. Two end caps 101 are provided and detachably connected to both ends of the cover 1. The end caps 101 are detachably connected to the float seat 2. By removing the end caps 101, maintenance and other work can be performed on the motor body 24. A water storage chamber is provided inside the cover 1, and a through-hole inlet 8 is provided on the cover 1. The inlet 8 facilitates the connection between the motor body 24 and the wiring. The elastic membrane a102 is located on the inner wall of the inlet 8, utilizing… Water pressure compresses the elastic diaphragm a102, causing it to compress the circuit and achieve a seal between the inlet 8 and the circuit. An opening communicating with the water storage chamber is provided on the cover 1. An elastic diaphragm b103 is located on the opening; the elastic diaphragm b103 further increases the water storage capacity of the water storage chamber, and its expansion further compresses the water inside, increasing the water pressure. A pile structure 18 is located on the inner wall of the cover 1 and extends into the inner side of the water storage chamber. The pile structure 18 is woven from thermally conductive carbon fiber and sound-absorbing cotton strips. Multiple thermally conductive carbon fibers are wrapped around the outside of the sound-absorbing cotton strips to prevent them from being exposed to the air. When the sound-absorbing cotton strip comes into contact with water, it enhances the sound absorption effect of the fleece structure 18. The fleece structure 18, in conjunction with the cold water in the water storage chamber, absorbs the noise generated by the motor body 24 during operation. The thermally conductive carbon fiber has excellent thermal conductivity, enabling heat exchange between the motor body 24 and the cold water, thus achieving heat dissipation for the motor body 24. The motor body 24 is mounted on the float seat 2 and located inside the cover 1. The cover 1 provides a complete seal for the motor body 24, preventing dust from entering its interior. The pump body 19 is mounted on the float seat 2 and connected to the water storage chamber via pipe a21. The cavity is connected; pipe b7 is connected to the water storage cavity and is equipped with a pressure relief valve 6. The pressure relief valve 6 can automatically discharge water into the water tank 5 through pipe b7 when the water pressure inside the water storage cavity is too high, so as to maintain the liquid level in the water tank 5. One end of pipe b7 extends to the inside of the water tank 5. The pump body 19 draws cold water from the water tank 5 into pipe a21, and then transports it to the water storage cavity through pipe a21. The cover 1 is equipped with an atomizing nozzle 3 that is connected to the water storage cavity. The cold water in the water storage cavity is atomized by the atomizing nozzle 3 and sprayed out, which can play a role in dust settling of coal ash and dust inside the coal mine, and improve the working environment of the coal mine.

[0031] The shock absorption mechanism includes a water tank 5, a base 9, a sleeve 12, a pressure rod 13, a spring a23, a ball a20, and a ball b17. The water tank 5 contains cold water, and the float seat 2 floats on the water surface. The base 9 is located inside the water tank 5 and has multiple ball grooves a901. The ball a20 rolls inside the ball groove a901, with two-thirds of the ball a20 inside the ball groove a901, allowing it to roll freely inside the ball groove a901. The ball a20 is connected to the sleeve 12. The pressure rod 13 slides inside the sleeve 12 and is connected to the bottom of the inner side of the sleeve 12 via the spring a23. The bottom of the float seat 2 has multiple ball grooves b201. The ball b17 rolls inside the ball groove b201 and is connected to the pressure rod 13, with two-thirds of the ball b17 inside the ball groove b201, allowing it to roll freely inside the ball groove b201.

[0032] In this embodiment, when the motor body 24 vibrates up and down, it will cause the float seat 2 to vibrate up and down. With the buffering effect of water, the vibration force of the motor can be initially buffered. When the float seat 2 vibrates up and down, it will cause the pressure rod 13 to vibrate up and down. The pressure rod 13 will compress the spring a23. With the buffering effect of the spring a23, the vibration force of the motor can be further buffered. At the same time, the water can also act as a damper to prevent the spring a23 from aggravating the vibration of the motor body 24, ensuring that the spring a23 can effectively buffer the vibration force of the motor body 24. When the motor body 24 vibrates in the horizontal direction, under the action of ball a20 in conjunction with ball groove a901 and ball b17 in conjunction with ball groove b201, the pressure rod 13 and sleeve 12 will tilt. When the pressure rod 13 and sleeve 12 tilt, the pressure rod 13 will stretch the spring a23. Under the elastic force of the spring a23, the vibration force of the motor body 24 in the horizontal direction can be buffered, thereby realizing the multi-directional vibration buffering function of the motor body 24 and significantly reducing the noise caused by vibration.

[0033] It is worth noting that when the motor body 24 vibrates, the vibration frequency is relatively high but the amplitude is relatively small, and the maximum tilt angle of the pressure rod 13 and the sleeve 12 is greater than the maximum amplitude of the motor body 24 in the horizontal direction.

[0034] Example 2, as Figure 2-3 As shown, the explosion-proof motor with a sealed and low-noise structure proposed in this invention, compared with Embodiment 1, further includes a baffle 4 connected to the outer peripheral surface of the float seat 2; a groove a is opened at the top of the water tank 5; a surrounding plate 22 is slidably provided inside the groove a; and a spring b14 is connected between the surrounding plate 22 and the bottom of the inner side of the groove a.

[0035] In this embodiment, the spring b14 is in a compressed state. Under the elastic force of the spring b14, when the motor body 24 vibrates up and down, the baffle 4 will vibrate along with the float 2 and drive the enclosure 22 to vibrate synchronously, so that the top of the enclosure 22 is always in contact with the baffle 4, thus preventing the water in the water tank 5 from splashing out.

[0036] Example 3, as Figure 7-8 As shown, the explosion-proof motor with a sealed and low-noise structure proposed in this invention, compared with Embodiment 2, further includes a telescopic component 16 on the base 9, a plate a10 connected to the telescopic component 16, a circular opening on the plate a10, a sleeve 12 passing through the circular opening, and a sealing ring 15 slidably mounted on the sleeve 12; an elastic membrane c11 is connected between the sealing ring 15 and the inner wall of the circular opening, the elastic membrane c11 can ensure that the sleeve 12 can tilt freely while ensuring the sealing between the plate a10 and the sleeve 12; a rubber layer is provided on the outer circumference of the plate a10 and the inner wall of the sealing ring 15 to enhance the sealing performance; a liquid level sensor floats on the water surface inside the water tank 5 to monitor the liquid level height, the liquid level sensor is a float-type liquid level sensor, its working principle is to use the float to rise and fall with the liquid level, and convert it into an electrical signal through a mechanical or magnetic device; a controller is provided on the outer surface of the water tank 5 to receive the feedback signal of the liquid level sensor, and an alarm is provided on the water tank 5; the liquid level sensor establishes an information transmission connection with the telescopic component 16 and the alarm.

[0037] In this embodiment, the rubber layer can enhance the sealing between the outer periphery of plate a10 and the inner wall of water tank 5, and at the same time enhance the sealing between sealing ring 15 and sleeve 12, ensuring that when plate a10 and sealing ring 15 move, water in water tank 5 can be prevented from seeping into the space below plate a10; when the water in water tank 5 decreases significantly (at this time, the buoyancy of water on float 2 decreases significantly, so it is necessary to raise the liquid level to ensure that the buoyancy of water on float 2 is at a normal value), the liquid level sensor can detect that the liquid level is lower than the threshold. At this time, the liquid level sensor sends a signal to the controller, and the controller controls the telescopic component 16 to start working, which drives plate a10 to rise through the telescopic component 16. A10 drives the sealing ring 15 to rise along the sleeve 12 via the elastic membrane C11, which in turn drives the cold water in the water tank 5 to rise, making it easier to adjust the liquid level of the cold water. When the liquid level returns to the normal range, the liquid level sensor feeds back to the controller, and the controller controls the telescopic component 16 to stop working. At this time, the liquid level of the cold water no longer rises, and the buoyancy of the float seat 2 returns to normal (when the liquid level drops significantly, the buoyancy of the float seat 2 will decrease significantly. At this time, the weight of the motor body 24, the cover 1 and other structures on the float seat 2 is mainly supported by the pressure rod 13 and the spring A23. The pressure rod 13 and the spring A23 can provide support for a short time to ensure that the position of the motor body 24 is in a normal state).

[0038] It is worth noting that the water tank 5 is equipped with a water injection pipe; when the telescopic component 16 reaches its maximum extension, the plate a10 and the sealing ring 15 reach their maximum rising height. At this time, the sealing ring 15 is still on the surface of the sleeve 12 and will not separate from the sleeve 12; when the telescopic component 16 reaches its maximum extension, the water level value monitored by the liquid level sensor has not returned to normal, indicating that the cold water in the water tank 5 needs to be replenished. The controller will control the alarm to sound an alarm to remind the staff, and the staff will replenish the cold water in the water tank 5 through the water injection pipe on the water tank 5.

[0039] In summary, when using this invention, after the external wiring passes through the inlet 8 and connects to the motor body 24, the end caps 101 on both sides are connected to the cover 1. Then, the pump body 19 draws cold water from the water tank 5 into the water storage chamber inside the cover 1 through pipe a21 until the elastic membrane b103 stops expanding. At this point, the pressure relief valve 6 is opened under water pressure, allowing the water in the storage chamber to flow back into the water tank 5 through pipe b7, thus achieving dynamic balance (i.e., the inflow rate of pipe a21 and the outflow rate of pipe b7 are the same, and the pressure relief valve 6 is always open). Simultaneously, during this process, the operator replenishes cold water into the water tank 5 through the water injection pipe to maintain the cold water level in the water tank 5 at a normal value (water injection into the water tank 5 is stopped after the above process is completed). At this time, Under the pressure of the water in the water storage chamber, the elastic membrane a102 is squeezed, and the elastic membrane a102 squeezes the inner surface of the line inlet 8, thus sealing the line inlet 8 and preventing external coal ash from entering the inner side of the cover 1. At the same time, the cold water in the water storage chamber comes into contact with the pile structure 18. The heat-conducting carbon fiber in the pile structure 18 can realize the heat exchange function between the motor body 24 and the cold water, thus realizing the heat dissipation function of the motor body 24. Meanwhile, the pile structure 18 is relatively dense and has a good sound absorption effect. Together with the cold water in the water storage chamber, it can absorb the noise generated by the motor body 24 when it is working. The cold water in the water storage chamber is atomized by the atomizing nozzle 3 and sprayed out, which can play a dust settling role for coal ash and dust inside the coal mine, thereby improving the working environment of the coal mine.

[0040] When the motor body 24 vibrates up and down, it drives the float 2 to vibrate up and down. With the buffering effect of the water, the vibration force of the motor can be initially buffered. When the float 2 vibrates up and down, it drives the pressure rod 13 to vibrate up and down. The pressure rod 13 compresses the spring a23. With the buffering effect of the spring a23, the vibration force of the motor can be further buffered. At the same time, the water can also act as a damper to prevent the spring a23 from aggravating the vibration of the motor body 24, ensuring that the spring a23 can effectively buffer the vibration force of the motor body 24. When the motor body 24 vibrates in the horizontal direction, under the action of ball a20 in conjunction with ball groove a901 and ball b17 in conjunction with ball groove b201, the pressure rod 13 and sleeve 12 will tilt. When the pressure rod 13 and sleeve 12 tilt, the pressure rod 13 will stretch the spring a23. Under the elastic force of the spring a23, the vibration force of the motor body 24 in the horizontal direction can be buffered, thereby realizing the multi-directional vibration buffering function of the motor body 24 and significantly reducing the noise caused by vibration.

[0041] As the cold water inside water tank 5 is consumed (through the atomizing nozzle 3), the water level in water tank 5 gradually decreases. When the level sensor detects that the cold water level is below the threshold, it sends a signal to the controller. The controller then controls the telescopic component 16 to start working, which in turn raises plate a10. Plate a10, through the elastic diaphragm c11, raises the sealing ring 15 along the sleeve 12, thereby raising the cold water level in water tank 5. This facilitates adjustment of the cold water level. When the water level returns to the normal range, the level sensor sends a signal to the controller, which then stops the telescopic component 16. At this point, the cold water level stops rising, and the buoyancy of the float 2 returns to normal (a significant drop in water level would cause a significant decrease in the buoyancy of the float 2). The weight of the motor body 24, cover 1, and other structures on the floating seat 2 is mainly supported by the pressure rod 13 and spring a23. The pressure rod 13 and spring a23 can provide support for a short time to ensure that the motor body 24 is in a normal position. When the telescopic component 16 reaches its maximum extension, the water level value monitored by the liquid level sensor has not returned to normal, indicating that the cold water in the water tank 5 needs to be replenished. The controller will control the alarm to sound an alarm to remind the staff. The staff will replenish the cold water in the water tank 5 through the water injection pipe on the water tank 5. At the same time, the controller will control the telescopic component 16 to work, so that the plate a10 descends to the lowest position (i.e., the initial position, which facilitates the maximum replenishment of cold water in the water tank 5). When the liquid level of the cold water in the water tank 5 returns to the initial state, the alarm will stop.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. An explosion-proof motor having a sealed low-noise structure, comprising a motor body (24), characterized by, Also include: The sealing mechanism, including cover (1), end cap (101), floating seat (2), pipe a (21), pipe b (7), pump body (19), elastic film a (102), elastic film b (103) and fluff structure (18); end cap (101) is provided with two and can be detachably connected in the cover (1) both ends; end cap (101) can be detachably connected on the floating seat (2); the inside of cover (1) is provided with water storage cavity, cover (1) is provided with through inlet (8); elastic film a (102) is arranged on the inner wall of inlet (8); cover (1) is provided with opening communicated with water storage cavity; elastic film b (103) is arranged on the opening; fluff structure (18) is arranged on the inner wall of cover (1) and extends to the inside of water storage cavity; motor body (24) is installed on the floating seat (2) and is located in the inside of cover (1); pump body (19) is arranged on the floating seat (2) and is communicated with water storage cavity through pipe a (21); pipe b (7) is communicated with water storage cavity and is provided with pressure relief valve (6) on pipe b (7), one end of pipe b (7) extends to the inside of water tank (5); The damping mechanism, including water tank (5), base (9), sleeve (12), pressure rod (13), spring a (23), ball a (20) and ball b (17); the inside of water tank (5) has cold water; floating seat (2) floats on the water surface; base (9) is arranged at the bottom of water tank (5), a plurality of ball grooves a (901) are arranged on base (9); ball a (20) is arranged inside ball groove a (901) and rolls; ball a (20) is connected with sleeve (12); pressure rod (13) is arranged inside sleeve (12) and slides and is connected with the bottom end of sleeve (12) through spring a (23); a plurality of ball grooves b (201) are arranged at the bottom end of floating seat (2); ball b (17) is arranged inside ball groove b (201) and rolls and is connected with pressure rod (13).

2. The explosion-proof motor with a sealed low-noise structure according to claim 1, characterized in that, Fluff structure (18) is woven from heat-conducting carbon fiber and sound-absorbing cotton.

3. The explosion-proof motor with a sealed low-noise structure according to claim 1, characterized in that, The cover (1) is provided with an atomizing nozzle (3) communicated with the water storage cavity.

4. The explosion-proof motor with a sealed low-noise structure according to claim 1, characterized in that, The outer periphery of the floating seat (2) is connected with a baffle (4); the top end of the water tank (5) is provided with a groove a; a baffle (22) is slidably arranged inside the groove a; a spring b (14) is connected between the baffle (22) and the bottom end inside the groove a.

5. The explosion-proof motor with a sealed low-noise structure according to claim 1, characterized in that, The base (9) is provided with a telescopic component (16); the telescopic component (16) is connected with a plate a (10); the plate a (10) is provided with a circular opening; the sleeve (12) passes through the circular opening, and a sealing ring (15) is slidably arranged on the sleeve (12); the sealing ring (15) and the inner wall of the circular opening are connected with an elastic film c (11).

6. The explosion-proof motor having a sealed low-noise structure according to claim 5, characterized by The outer periphery of the plate a (10) and the inner wall of the sealing ring (15) are provided with a rubber layer for enhancing the sealing property.

7. The explosion-proof motor with a sealed low-noise structure according to claim 1, characterized in that, A liquid level sensor is floated on the water surface inside the water tank (5) for monitoring the liquid level height of the water surface.

8. The explosion-proof motor with a sealed low-noise structure according to claim 7, characterized in that, The outer surface of the water tank (5) is provided with a controller for receiving the feedback signal of the liquid level sensor, and the water tank (5) is provided with an alarm; the liquid level sensor is connected with the telescopic component (16) and the alarm for information transmission.

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