A water tank liquid level measuring device

Abstract

The utility model relates to liquid level monitoring technical field especially relates to water tank liquid level measuring device, including magnetic flap liquid level meter department, static pressure type liquid level meter department, blowdown valve and switch mechanism, magnetic flap liquid level meter department includes main guide pipe, magnetic flap display board and magnetic float, and the lower extreme of main guide pipe is connected with water tank main body, and the blowdown valve is installed on the main guide pipe, and the magnetic float sets up in the main guide pipe, and the magnetic flap display board fixedly connected in the one side of main guide pipe, and the magnetic flap display board floats with magnetic float and shows liquid level in real time, and the magnetic flap display board can reflect the position of magnetic float in main guide pipe in real time, to obtain first liquid level data. Static pressure type liquid level meter department includes controller and probe, and the probe is fixedly connected in the lower extreme of main guide pipe, and the second liquid level data is measured with water pressure, and the controller is connected with the probe, is used for receiving and dispatching liquid level data. The controller integrates wireless transceiver function, and after receiving the liquid level data that probe measures, utilizes wireless signal to transmit the liquid level data to the background terminal, and the background staff is monitored conveniently.

Description

Technical Field

[0001] This utility model relates to the field of liquid level monitoring technology, and in particular to a water tank liquid level measuring device. Background Technology

[0002] Water is an essential part of our lives, and the quality of urban water supply is related to people's health and quality of life.

[0003] As urbanization continues to advance in my country, many high-rise buildings are springing up. These buildings employ a water tank + variable frequency water supply secondary pressurization mode to ensure water pressure for residents. Existing water tanks use static pressure level gauges for remote monitoring of the tank level. However, the measurement data is limited and cannot quickly determine whether the level gauge is malfunctioning, leading to maintenance difficulties. Utility Model Content

[0004] The purpose of this invention is to provide a water tank level measuring device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides a water tank level measuring device, comprising a magnetic float level gauge, a hydrostatic level gauge, a drain valve, and a switching mechanism. The magnetic float level gauge includes a main guide tube, a magnetic float display panel, and a magnetic float cylinder. The lower end of the main guide tube is connected to the main body of the water tank, and the drain valve is installed on the main guide tube. The magnetic float cylinder is disposed inside the main guide tube, and the magnetic float display panel is fixedly connected to one side of the main guide tube. The magnetic float display panel floats with the magnetic float cylinder and displays the liquid level in real time. The hydrostatic level gauge includes a controller and a probe. The probe is fixedly connected inside the lower end of the main guide tube, and the controller is connected to the probe for transmitting and receiving liquid level data. The switching mechanism is used to control the opening and closing of the drain valve.

[0006] Furthermore, the water tank level measuring device also includes a back-end terminal. The controller is communicatively connected to the back-end terminal. After receiving the level data measured by the probe, the controller transmits the level data to the back-end terminal. Level data and other information can be transmitted to multiple back-end terminals via communication methods such as dedicated networks of communication operators.

[0007] Furthermore, the liquid level measuring device also includes an alarm connected to the controller, which sounds an alarm when the liquid level in the water tank exceeds a preset value.

[0008] Furthermore, the back-end terminal is preset with abnormal liquid level values. When the liquid level data measured by the probe reaches the abnormal liquid level value, the controller triggers the alarm. Furthermore, the water tank level measuring device also includes a wiping section, which is installed inside the lower end of the main guide tube and used to clean the probe. The switching mechanism is installed between the wiping section and the drain valve and is used to control the switching of the wiping section. Furthermore, the wiping unit includes a sliding seat, a rotating shaft, blades, a brush head, and brushing material. The sliding seat is located in front of the probe. The front end of the rotating shaft is rotatably connected to the sliding seat, and the rear end of the rotating shaft is fixedly connected to the brush head. The brushing material is installed on the brush head, and the blades are fixedly connected to the rotating shaft. A water inlet communicating with the water tank body is provided on one side of the lower end of the main guide tube. When the wiping unit is open, the brushing material contacts the probe, and the blades are opposite to the water inlet. When the wiping unit is closed, the brushing material is disengaged from the probe, and the blades are offset from the water inlet. The switching mechanism drives the sliding seat to move back and forth to control the switching of the wiping unit. Furthermore, the wiping unit also includes a housing, and the main guide tube has an installation port on the side away from the probe. The housing is installed outside the installation port, and the sliding seat is slidably connected in the housing. When the wiping unit is closed, the distance between the brush head and the probe is greater than 5cm. Furthermore, the rotating shaft is coaxially arranged with the probe, and the brush head includes a first segment and a second segment. The first segment is parallel to the end face of the probe and is fixedly connected to the rotating shaft. The second segment is parallel to the outer peripheral surface of the probe. The brush material is installed on the inner side of both the first segment and the second segment. When the wiping part is turned on, the brush material on the first segment contacts the end face of the probe, and the brush material on the second segment contacts the outer peripheral surface of the probe. Furthermore, the wiping unit also includes a gear, a drive shaft, and a rack. The rack is fixedly connected to the lower side of the sliding seat. The gear is rotatably connected to the housing through the drive shaft and meshes with the rack. The drive shaft passes through the housing and extends to the outside of the housing. Furthermore, the switching mechanism includes a transmission component and a handle. The handle is connected to the transmission shaft via the transmission component. The handle is mounted on the drain valve. Rotating the handle controls the switching of the drain valve and the wiping unit.

[0009] The beneficial effects of this utility model are as follows: 1. The magnetic levitation tube floats on the water surface and moves up and down within the main guide tube according to the liquid level. A magnetic float display panel is fixedly connected to one side of the main guide tube and displays the liquid level in real time as the magnetic levitation tube floats. The magnetic float display panel reflects the position of the magnetic levitation tube within the main guide tube in real time, obtaining the first liquid level data. The hydrostatic level gauge unit includes a controller and a probe. The probe is fixedly connected to the lower end of the main guide tube and uses water pressure to measure the second liquid level data. The controller is connected to the probe for transmitting and receiving liquid level data. The controller integrates wireless transceiver functionality. After receiving the liquid level data measured by the probe, it transmits the liquid level data wirelessly to the back-end terminal for convenient monitoring by back-end personnel. When the water tank is being cleaned or maintained, maintenance information can be transmitted to the back-end terminal via the controller for convenient monitoring by back-end personnel. When the two liquid level data differ significantly, it indicates a malfunction in the magnetic float level gauge unit or the hydrostatic level gauge unit, requiring repair of the liquid level measuring device.

[0010] 2. The wiping section is installed inside the lower end of the main guide tube and is used to clean the probe. The wiping section adopts a motor and brush structure, or a push rod and scraper structure, or other structures, which are not limited here. The switching mechanism is installed between the wiping section and the drain valve and is used to control the opening and closing of the wiping section and the drain valve. The switching mechanism can be two independent structures that can control the opening and closing of the drain valve 3 and the wiping section respectively, or a linkage structure that controls the opening and closing of the drain valve and the wiping section synchronously, which are not limited here.

[0011] 3. The liquid level measuring device also includes an alarm connected to the controller. When the liquid level in the water tank exceeds a preset value, the alarm will sound. The alarm can be an audible and visual alarm, installed on the upper end of the main pipe, visible even to personnel at a distance. Abnormal liquid levels can be preset on the back-end terminal, for example, setting the height of the water tank as the abnormal liquid level. The probe monitors the liquid level data in real time. When the liquid level reaches the abnormal level, the controller triggers the alarm, which emits a flashing light and an alarm sound, facilitating nearby property management to conduct an inspection. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 A schematic diagram of the water tank level measuring device provided in this embodiment of the present invention when the wiping section is not working; Figure 2 for Figure 1 A sectional view; Figure 3 for Figure 2Enlarged view of section A; Figure 4 A schematic diagram of the liquid level measuring device provided in this embodiment of the present invention when the wiping section is working; Figure 5 for Figure 4 Enlarged view of section B.

[0014] Explanation of reference numerals in the attached figures: 3. Drain valve; 4. Main pipe; 5. Magnetic flip display panel; 6. Magnetic levitation cylinder; 7. Water tank body; 8. Probe; 9. Sliding seat; 10. Rotating shaft; 11. Blade; 12. Brush head; 121. First section; 122. Second section; 13. Brush material; 14. Water inlet; 15. Housing; 16. Mounting port; 17. Gear; 18. Drive shaft; 19. Rack; 20. Handle; 21. Drive pulley; 22. Belt; 23. Driven pulley. Detailed Implementation

[0015] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0019] Reference Figures 1 to 5 As an embodiment of this utility model, a water tank 7 liquid level measuring device includes a magnetic float liquid level gauge, a static pressure liquid level gauge, a drain valve 3, and a switching mechanism. The magnetic float liquid level gauge includes a main guide tube 4, a magnetic float display plate 5, and a magnetic float cylinder 6. The lower end of the main guide tube 4 is connected to the main body of the water tank 7. The drain valve 3 is installed on the main guide tube 4. The magnetic float cylinder 6 is disposed inside the main guide tube 4. The magnetic float display plate 5 is fixedly connected to one side of the main guide tube 4. The magnetic float display plate 5 floats with the magnetic float cylinder 6 and displays the liquid level in real time. The static pressure liquid level gauge includes a controller and a probe 8. The probe 8 is fixedly connected inside the lower end of the main guide tube 4. The controller is connected to the probe 8 and is used to send and receive liquid level data. The switching mechanism is used to control the opening and closing of the drain valve 3.

[0020] Specifically, the main guide pipe 4 is vertically fixed to the outside of the main body of the water tank 7. The lower end of the main guide pipe 4 is connected to the main body of the water tank 7 and the aforementioned drain valve 3 is installed thereon. Water in the main body of the water tank 7 enters the main guide pipe 4 from the lower end. An air hole is provided at the upper end of the main guide pipe 4 to balance the air pressure inside the main guide pipe 4. The liquid level inside the main guide pipe 4 is consistent with the liquid level inside the main body of the water tank 7. A filter screen can be installed on the air hole to prevent foreign objects from entering. The drain valve 3 can be a butterfly valve, a ball valve, a solenoid valve, or other valve structures, which are not limited here. The magnetic float 6 is set inside the main guide pipe 4. The magnetic float 6 has a hollow structure and floats on the water surface, moving up and down inside the main guide pipe 4 with the liquid level. The magnetic float plate displays... The display panel 5 is fixedly connected to one side of the main guide tube 4 and floats with the magnetic float 6 to display the liquid level in real time. The specific structure and principle of the magnetic float display panel 5 can refer to existing magnetic float level gauges and will not be elaborated further. The magnetic float display panel 5 can reflect the position of the magnetic float 6 in the main guide tube 4 in real time to obtain the first liquid level data. The hydrostatic level gauge includes a controller and a probe 8. The probe 8 is fixedly connected to the lower end of the main guide tube 4 and uses water pressure to measure the second liquid level data. The controller is connected to the probe 8 and is used to transmit and receive liquid level data. The controller integrates wireless transceiver function. After receiving the liquid level data measured by the probe 8, it uses a wireless signal to transmit the liquid level data to the back-end terminal for easy monitoring by back-end personnel. When the difference between the two liquid level data is large, it indicates that the magnetic float level gauge or the hydrostatic level gauge is faulty and the liquid level measuring device needs to be repaired. The specific structure of the probe 8 and the controller can refer to existing hydrostatic level gauges and will not be elaborated further here, as it is not the main improvement of this utility model.

[0021] Because the water contains impurities such as mud, sand, and rust, these impurities are easily deposited at the bottom of the main pipe 4 and attached to the surface of the probe 8, affecting the measurement accuracy. Therefore, it is necessary to open the drain valve 3 regularly to remove the impurities at the bottom of the main pipe 4. When removing impurities, the wiping part is opened to wipe the surface of the probe 8. After the impurities on the surface of the probe 8 are wiped off, they are discharged with the water flow.

[0022] Furthermore, the water tank 7 level measuring device also includes a wiping section, which is installed inside the lower end of the main guide pipe 4 and used to clean the probe 8. A switching mechanism is installed between the wiping section and the drain valve 3 to control the switching of the wiping section. The wiping section, installed inside the lower end of the main guide pipe 4, is used to clean the probe 8. The wiping section can be a motor and brush structure, a push rod and scraper structure, or other structures, which are not limited here. The switching mechanism, installed between the wiping section and the drain valve 3, is used to control the switching of both the wiping section and the drain valve 3. The switching mechanism can be two independent structures that can separately control the switching of the drain valve 3 and the wiping section, or a linked structure that synchronously controls the switching of the drain valve 3 and the wiping section, which are not limited here.

[0023] Specifically, the wiping unit includes a sliding seat 9, a rotating shaft 10, a blade 11, a brush head 12, and brush material 13. The sliding seat 9 is located in front of the probe 8. Figure 3 The probe 8 has a cylindrical structure, with its end face facing forward and installed inside the main guide tube 4. A sliding seat 9 supports the rotating shaft 10, with its front end rotatably connected to the sliding seat 9. The rear end of the rotating shaft 10 is fixedly connected to the brush head 12, and the brush material 13 is mounted on the brush head 12. Multiple blades 11 are fixedly connected to the rotating shaft 10 along its outer circumference. A water inlet 14, communicating with the main body of the water tank 7, is located on one side of the lower end of the main guide tube 4. The water inlet 14 is specifically connected to the main body of the water tank 7 via a flange structure to ensure sealing and reliability. When the wiping section is open, the brush material 13 contacts the probe 8, and the blades 11 on the upper side of the rotating shaft 10 face the water inlet 14. When the drain valve 3 is opened, water in the main guide tube 4 is discharged downwards, and water from the main body of the water tank 7 enters the main guide tube 4 through the water inlet 14, using the water flow as a power source to clean the probe 8. Water flow impacts the blade 11, and the blade 11 drives the brush material 13 and brush head 12 to rotate via the rotating shaft 10. The brush material 13 wipes the probe 8 along the outer peripheral surface to remove impurities from the surface of the probe 8. When the wiping part is closed, the brush material 13 is disengaged from the probe 8, and the blade 11 on the upper side of the rotating shaft 10 is misaligned with the water inlet 14. The switching mechanism drives the sliding seat 9 to move back and forth to control the opening and closing of the wiping part.

[0024] The wiping unit also includes a housing 15, which is made of stainless steel to enhance rust resistance. A mounting port 16 is located on the side of the main guide tube 4 furthest from the probe 8. The housing 15 is mounted on the outside of the mounting port 16 via a flange sealing structure to ensure a seal between the housing 15 and the mounting port 16. When the wiping unit malfunctions or wears out, the housing 15 can be removed for repair or replacement of internal components. The sliding seat 9 is slidably connected within the housing 15. A guide rail, track, or sleeve can be installed between the sliding seat 9 and the housing 15 to improve the stability of the sliding seat 9's movement. When the wiping unit is closed, the distance between the brush head 12 and the probe 8 is L, where L > 5cm, to prevent the brush head 12 from affecting the water flow around the probe 8, thereby affecting the accuracy of the liquid level data.

[0025] In this embodiment, the rotating shaft 10 is coaxially arranged with the probe 8. The brush head 12 includes a first segment 121 parallel to the end face of the probe 8 and fixedly connected to the rotating shaft 10, and a second segment 122 parallel to the outer peripheral surface of the probe 8. The brush head 12 has an L-shaped structure. One end of the first segment 121 is vertically fixedly connected to the rear end of the rotating shaft 10, and the front end of the second segment 122 is fixedly connected to the end of the first segment 121 away from the rotating shaft 10. The brush material 13 is installed on the inner side of both the first segment 121 and the second segment 122. When the wiping part is turned on, the brush material 13 on the first segment 121 contacts the end face of the probe 8, and the brush material 13 on the second segment 122 contacts the outer peripheral surface of the probe 8. When the rotating shaft 10 rotates under the action of water flow, the first segment 121 drives the inner brush material 13 to wipe the entire end face of the rotating shaft 10, and the second segment 122 drives the inner brush material 13 to wipe the outer peripheral surface of the rotating shaft 10.

[0026] Furthermore, the wiping unit also includes a gear 17, a drive shaft 18, and a rack 19. The rack 19 is fixedly connected to the lower side of the sliding seat 9. The gear 17 is rotatably connected to the housing 15 through the drive shaft 18 and meshes with the rack 19. The drive shaft 18 passes through the housing 15 and extends to the outside of the housing 15.

[0027] Specifically, a dynamic seal is applied between the housing 15 and the drive shaft 18 to prevent water leakage from the housing 15. The switching mechanism includes a transmission assembly and a handle 20. The handle 20 is connected to the drive shaft 18 via the transmission assembly. The handle 20 is mounted on the drain valve 3. Rotating the handle 20 controls the opening and closing of the drain valve 3 and the wiping section. In this embodiment, the drain valve 3 is specifically a ball valve. Rotating the handle 20 controls the opening and closing of the drain valve 3. Since the handle 20 and the rotating shaft 10 are connected via the transmission assembly, when the handle 20 is rotated to open the drain valve 3, the drive shaft 18 will rotate accordingly, driving the sliding seat 9 to move backward, causing the brush 13 to contact the probe 8, thus opening the wiping section. Similarly, rotating the handle 20 in the opposite direction closes the drain valve 3 and the wiping section. The transmission assembly includes a drive pulley 21, a belt 22, and a driven pulley 23. The drive pulley 21 is fixedly connected to the handle 20, and the driven pulley 23 is fixedly connected to the transmission shaft 18. The drive pulley 21 and the driven pulley 23 are driven by the belt 22.

[0028] Furthermore, the liquid level measuring device also includes an alarm connected to the controller. When the liquid level in the main body of the water tank 7 exceeds the preset value, the alarm will sound. The alarm can be an audible and visual alarm, installed on the upper end of the main pipe 4, which can be seen by people at a distance. Abnormal liquid level values ​​can be preset in the background terminal, such as setting the height of the main body of the water tank 7 as the abnormal liquid level. The probe 8 detects the liquid level data in real time. When the liquid level data reaches the abnormal liquid level, the controller triggers the alarm, which emits a flash and an alarm sound, making it convenient for nearby property management to come and check.

[0029] Furthermore, the brush 13 is made of soft bristles or silicone. Both soft bristles and silicone are relatively soft, preventing the brush 13 from damaging the probe 8.

[0030] In this embodiment, the magnetic levitation cylinder 6 floats on the water surface and moves up and down within the main guide tube 4 according to the liquid level. A magnetic flip display panel 5 is fixedly connected to one side of the main guide tube 4 and displays the liquid level in real time as the magnetic levitation cylinder 6 floats. The magnetic flip display panel 5 can reflect the position of the magnetic levitation cylinder 6 in the main guide tube 4 in real time to obtain the first liquid level data. The hydrostatic level gauge includes a controller and a probe 8. The probe 8 is fixedly connected to the lower end of the main guide tube 4 and uses water pressure to measure the second liquid level data. The controller is connected to the probe 8 for transmitting and receiving liquid level data. The controller integrates wireless transceiver functionality; after receiving the liquid level data measured by the probe 8, it uses a wireless signal to transmit the liquid level data to the back-end terminal for convenient monitoring by back-end personnel.

[0031] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A water tank level measuring device, characterized in that, The system includes a magnetic float level gauge, a static pressure level gauge, a drain valve (3), and a switching mechanism. The magnetic float level gauge includes a main pipe (4), a magnetic float display panel (5), and a magnetic float cylinder (6). The lower end of the main pipe (4) is connected to the main body of the water tank (7). The drain valve (3) is installed on the main pipe (4). The magnetic float cylinder (6) is located inside the main pipe (4). The magnetic float display panel (5) is fixedly connected to one side of the main pipe (4). The magnetic float display panel (5) floats with the magnetic float cylinder (6) and displays the liquid level in real time. The static pressure level gauge includes a controller and a probe (8). The probe (8) is fixedly connected to the lower end of the main pipe (4). The controller is connected to the probe (8) and is used to send and receive liquid level data. The switching mechanism is used to control the opening and closing of the drain valve (3).

2. The water tank level measuring device as described in claim 1, characterized in that, It also includes a back-end terminal. The controller is connected to the back-end terminal for communication. After receiving the liquid level data measured by the probe (8), the controller transmits the liquid level data to the back-end terminal.

3. The water tank level measuring device as described in claim 2, characterized in that, The liquid level measuring device also includes an alarm connected to the controller. When the liquid level in the water tank body (7) exceeds the preset value, the alarm will sound an alarm.

4. The water tank level measuring device as described in claim 3, characterized in that, The background terminal is preset with abnormal liquid level values. When the liquid level data measured by the probe (8) reaches the abnormal liquid level value, the controller triggers the alarm.

5. The water tank level measuring device as described in claim 1, characterized in that, It also includes a wiping section, which is installed in the lower end of the main tube (4) and used to clean the probe (8). The switching mechanism is installed between the wiping section and the drain valve (3) and is used to control the switching of the wiping section.

6. The water tank level measuring device as described in claim 5, characterized in that, The wiping unit includes a sliding seat (9), a rotating shaft (10), blades (11), a brush head (12), and brushing material (13). The sliding seat (9) is located in front of the probe (8). The front end of the rotating shaft (10) is rotatably connected to the sliding seat (9). The rear end of the rotating shaft (10) is fixedly connected to the brush head (12). The brushing material (13) is mounted on the brush head (12). The blades (11) are fixedly connected to the rotating shaft (10). The main guide tube (4) The lower end of the wiping part is provided with a water inlet (14) that communicates with the main body of the water tank (7). When the wiping part is turned on, the brush (13) contacts the probe (8) and the blade (11) is opposite to the water inlet (14). When the wiping part is turned off, the brush (13) is separated from the probe (8) and the blade (11) is offset from the water inlet (14). The switching mechanism drives the sliding seat (9) to move back and forth to control the wiping part switch.

7. The water tank level measuring device as described in claim 6, characterized in that, The wiping unit also includes a housing (15). The main tube (4) is provided with an installation port (16) on the side away from the probe (8). The housing (15) is installed outside the installation port (16). The sliding seat (9) is slidably connected in the housing (15). When the wiping unit is closed, the distance between the brush head (12) and the probe (8) is greater than 5cm.

8. The water tank level measuring device as described in claim 7, characterized in that, The rotating shaft (10) is coaxially arranged with the probe (8). The brush head (12) includes a first segment (121) and a second segment (122). The first segment (121) is parallel to the end face of the probe (8) and is fixedly connected to the rotating shaft (10). The second segment (122) is parallel to the outer peripheral surface of the probe (8). The brush material (13) is installed on the inner side of both the first segment (121) and the second segment (122). When the wiping part is turned on, the brush material (13) on the first segment (121) contacts the end face of the probe (8), and the brush material (13) on the second segment (122) contacts the outer peripheral surface of the probe (8).

9. The water tank level measuring device as described in claim 6, characterized in that, The wiping unit also includes a gear (17), a drive shaft (18), and a rack (19). The rack (19) is fixedly connected to the lower side of the sliding seat (9). The gear (17) is rotatably connected to the housing (15) through the drive shaft (18) and meshes with the rack (19). The drive shaft (18) passes through the housing (15) and extends to the outside of the housing (15).

10. The water tank level measuring device as described in claim 9, characterized in that, The switching mechanism includes a transmission component and a handle (20). The handle (20) is connected to the transmission shaft (18) via the transmission component. The handle (20) is mounted on the drain valve (3). Rotating the handle (20) controls the switch between the drain valve (3) and the wiping part.

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