Liquid level measuring device suitable for urea solution storage tank

Abstract

The invention discloses a liquid level measuring device suitable for a urea solution storage tank, and belongs to the field of liquid level measurement, the liquid level measuring device comprises a measuring tube, a magnetic turning plate mounted on the measuring tube, and a magnetic floater slidably arranged in the measuring tube and used for being matched with the magnetic turning plate; a first cleaning mechanism is arranged on the measuring tube and comprises driving discs arranged at the top and the bottom in the measuring tube, a scraper plate fixedly connected between the two driving discs and abutting against the inner wall of the measuring tube, and a driving piece used for driving the two driving discs to rotate synchronously. Through the design of the first cleaning mechanism, the driving piece drives the two driving discs and the scraper to rotate synchronously, the scraper rotates circumferentially along the inner wall of the measuring pipe to effectively scrape crystals on the inner wall of the measuring pipe, the situation that the crystals cause the caliber of the measuring pipe to be reduced, and normal movement of a magnetic floater is affected is avoided, and the liquid level measuring accuracy is improved; the device is not only suitable for a urea solution storage tank, but also can be used for measuring the liquid level of other easy-to-crystallize liquid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid level measurement, in particular to a liquid level measuring device suitable for a urea solution storage tank. BACKGROUND

[0002] In the operation process of a selective catalytic reduction (SCR) system, urea solution as a core reducing agent, its stable storage and accurate liquid level monitoring are crucial to the overall performance of the system. In order to meet the storage needs of urea solution, the industry generally uses stainless steel to make urea solution storage tanks. This material has good corrosion resistance and can ensure the stability of urea solution during storage.

[0003] Since the liquid level state of urea solution is directly related to the stability of the liquid supply of the SCR system, a liquid level monitoring device needs to be configured outside the stainless steel storage tank. The magnetic flap liquid level meter is currently widely used. This type of liquid level meter is mainly composed of a measuring tube, a magnetic flap and a magnetic float. The measuring tube is in communication with the inside of the storage tank, the magnetic flap is installed outside the measuring tube, and the magnetic float is slidingly arranged inside the measuring tube. When working, the magnetic float moves up and down along the measuring tube with the change of the liquid level of urea solution in the storage tank, and drives the outside magnetic flap to flip through magnetic coupling, thereby realizing real-time visual monitoring of the liquid level of urea solution in the storage tank.

[0004] However, urea solution is prone to crystallization during storage due to factors such as environmental temperature fluctuations. Solid particles produced by crystallization can gradually adhere to the inner wall of the measuring tube of the magnetic flap liquid level meter. With the passage of time, the accumulation of crystalline substances will gradually reduce the effective aperture of the measuring tube. This problem not only increases the sliding resistance of the magnetic float in the measuring tube, but also causes the magnetic float to be stuck, thereby causing measurement errors and even causing the entire liquid level monitoring device to fail.

[0005] Therefore, the present application provides a liquid level measuring device suitable for a urea solution storage tank to solve the above problems. SUMMARY

[0006] The present application provides a liquid level measuring device suitable for a urea solution storage tank, which aims to solve the problems of existing magnetic flap liquid level meters caused by urea solution crystallization adhering to the inner wall of the measuring tube, such as reducing the effective aperture of the measuring tube, increasing the sliding resistance of the magnetic float, or even causing the magnetic float to be stuck, resulting in measurement errors or device failure.

[0007] In order to achieve the above object, the present application provides the following technical scheme: A liquid level measuring device suitable for urea solution storage tank, comprising a measuring tube, a magnetic float installed on the measuring tube and a magnetic float installed in the measuring tube for adapting to the magnetic float, the bottom of the measuring tube is provided with a water inlet pipe for communicating with the water outlet of the urea solution storage tank, and the water inlet pipe is arranged obliquely downward, the top of the measuring tube is provided with a water outlet pipe for communicating with the water inlet of the urea solution storage tank, and the water inlet pipe and the water outlet pipe are both provided with a control valve; in order to facilitate cleaning of the crystallization on the inner wall of the measuring tube: the measuring tube is provided with a first cleaning mechanism, the first cleaning mechanism comprises drive discs arranged at the top and bottom of the measuring tube, a scraper fixedly connected between the two drive discs and abutting against the inner wall of the measuring tube, and a driving member for driving the two drive discs to rotate synchronously. The two drive discs are driven to rotate synchronously by the driving member, the drive disc rotates to drive the scraper to rotate along the inner wall of the measuring tube, the scraper abuts against the inner wall of the measuring tube, and the crystallization adsorbed on the inner wall of the measuring tube is directly scraped off in the rotating process, so that the internal space of the measuring tube is unobstructed, and the magnetic float can slide up and down normally with the liquid level.

[0008] Preferably, in order to reduce the adsorption of crystallization: the measuring tube, the scraper and the drive disc are all made of stainless steel resistant to urea corrosion, and the inner wall of the measuring tube, the outer wall of the scraper and the outer wall of the drive disc are all smooth and polished. The adsorption probability of the crystallization on the inner wall of the measuring tube, the outer wall of the scraper and the outer wall of the drive disc is reduced, the cleaning frequency is reduced, the corrosion resistance of the components is improved, and the service life of the device is prolonged.

[0009] Preferably, in order to improve the scraping efficiency: the end of the scraper close to the inner wall of the measuring tube is in a V shape, and the other end is in a square shape. The scraping efficiency of the crystallization on the inner wall of the measuring tube is improved, the crystallization is completely removed, and the residual crystallization does not affect the subsequent measurement.

[0010] Preferably, the driving member comprises a protective shell fixedly connected to the upper end and the lower end of the measuring tube, and a servo motor, one end of each of the two drive discs is fixedly connected with a rotating shaft, one end of the rotating shaft away from the drive disc penetrates through the measuring tube and extends into the protective shell, a driven gear fixedly sleeved on the rotating shaft is arranged in the protective shell, a rotating rod parallel to the side of the measuring tube penetrates through the protective shell, one end of the rotating rod is fixedly connected with the output end of the servo motor installed on the protective shell, a transmission gear fixedly sleeved on the rotating rod is arranged in the protective shell, and the transmission gear is in meshing connection with the driven gear. Through the cooperation of the servo motor, the rotating shaft, the driven gear, the rotating rod and the transmission gear, stable and synchronous driving force is provided for the drive disc, the scraper rotates uniformly along the inner wall of the measuring tube, the cleaning effect is stable, the internal transmission components are protected from external interference and corrosion by the protective shell.

[0011] Preferably, in order to prevent liquid leakage: a mechanical seal is arranged between the rotating shaft and the measuring tube, and the rotating shaft is connected to the protective shell through a sealed bearing. The urea solution or other liquid in the measuring tube is prevented from leaking, ensuring the sealing and safety of the device operation, avoiding liquid corrosion of external components or environmental pollution.

[0012] Preferably, in order to improve the cleaning effect: a plurality of fixed sleeves are fixedly connected to the rotating shaft along its length direction, and a plurality of beating belts are fixedly connected to the outer wall of the fixed sleeves. Through the cooperation of the fixed sleeves and beating belts on the rotating shaft, the rotation of the beating belts is driven by the rotation of the rotating shaft, so that the beating belts strike the outer wall of the measuring tube during rotation, forming vibration waves, further enhancing the removal effect of the crystals on the inner wall of the measuring tube, and realizing "scraping + vibration stripping" dual cleaning, reducing stubborn crystal residues.

[0013] Preferably, in order to facilitate the collection and discharge of crystals inside the measuring tube: an arc-shaped elbow pipe is fixedly connected to the bottom of the measuring tube, and a blowdown valve is fixedly installed at the bottom of the arc-shaped elbow pipe. The collected crystals in the measuring tube are conveniently discharged, avoiding the accumulation of crystals at the bottom of the measuring tube, ensuring the smoothness of the measuring tube, and reducing the difficulty of subsequent cleaning.

[0014] Preferably, in order to facilitate the removal of crystals adsorbed on the scraper: a floating ball is fixedly sleeved on the outside of the magnetic float, air cavities are arranged at the top and bottom of the floating ball, a vertical groove is formed on the outside of the floating ball, the floating ball is slidably sleeved on the scraper through the vertical groove, a plurality of polyurethane crystal scraping strips are equidistantly arranged in the vertical groove along its vertical direction, and the crystal scraping strips are in interference fit with the scraper. Through the cooperation of the liquid, the magnetic float and the floating ball, the floating ball drives the crystal scraping strips to move up and down along the scraper, which can automatically remove the crystals adsorbed on the scraper, prevent the accumulation of crystals on the surface of the scraper from causing the scraper to be stuck or the cleaning effect to be reduced, and further ensure the stable operation of the device and the accuracy of liquid level measurement.

[0015] Preferably, the floating ball is made of aging-resistant nitrile rubber, and a polytetrafluoroethylene anti-sticking layer is sprayed on the surface of the floating ball. The middle part of the floating ball is in a cylindrical shape, and the two ends are in a conical arc surface shape. The aging resistance and anti-sticking property of the floating ball are improved, the adsorption of crystals on the surface of the floating ball is reduced, the stress structure of the floating ball is optimized, the resistance during the up and down movement of the floating ball is reduced, and the synchronous and stable movement of the floating ball with the magnetic float is ensured.

[0016] Preferably, the shape of the crystal scraping strip is consistent with the shape of the outer wall of the scraper, and the cross section of the crystal scraping strip is triangular. The crystal scraping strip is fully attached to the outer wall of the scraper, the removal effect of the crystals on the surface of the scraper is improved, and the residual crystals caused by loose attachment are avoided.

[0017] This application utilizes the design of a first cleaning mechanism, which uses a driving component to drive two driving discs and a scraper to rotate synchronously. The scraper rotates circumferentially along the inner wall of the measuring tube, effectively scraping away crystals on the inner wall of the measuring tube. This prevents crystallization from reducing the diameter of the measuring tube and affecting the normal movement of the magnetic float, thereby improving the accuracy of liquid level measurement. It is not only suitable for urea solution storage tanks, but can also be used for liquid level measurement of other easily crystallizing liquids.

[0018] This application utilizes the cooperation of a servo motor, rotating shaft, driven gear, rotating rod, and transmission gear to provide a stable and synchronous driving force for the drive disk, ensuring that the scraper rotates at a uniform speed along the inner wall of the measuring tube, thus guaranteeing a stable cleaning effect. At the same time, the protective shell can protect the internal transmission components from external interference and corrosion.

[0019] This application utilizes the cooperation between the fixed sleeve on the rotating rod and the tapping belt. The rotation of the rotating rod drives the tapping belt to rotate, causing the tapping belt to strike the outer wall of the measuring tube during rotation, generating vibration waves. This further enhances the removal effect on the crystals on the inner wall of the measuring tube. Combined with the scraper, it achieves dual cleaning of "scraping + vibration peeling", reducing stubborn crystal residue.

[0020] This application utilizes the combination of liquid, magnetic float, and float ball to cause the float ball to drive the crystal scraper to move up and down along the scraper, which can automatically remove crystals adsorbed on the scraper and prevent crystals from accumulating on the scraper surface, causing the scraper to jam or reducing the cleaning effect, thereby further ensuring the stable operation of the device and the accuracy of liquid level measurement. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a liquid level measuring device suitable for urea solution storage tanks; Figure 2 for Figure 1 A schematic diagram of the other side of the liquid level measuring device; Figure 3 This is a schematic diagram of the internal structure of the measuring tube; Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 for Figure 3 Enlarged view of the structure at point B; Figure 6 for Figure 3 Enlarged view of a local part of the structure; Figure 7 This is a schematic diagram of the connection between the drive disc and the scraper. Figure 8 This is a schematic diagram of the structure of the float and the scraper bar; Figure 9 for Figure 8 The structural sectional view in the image.

[0022] In the picture: 1. Measuring tube; 11. Inlet pipe; 12. Outlet pipe; 13. Control valve; 14. Arc-shaped bend; 15. Drain valve; 2. Magnetic flap; 3. Magnetic float; 4. First cleaning mechanism; 41. Drive disc; 42. Scraper; 43. Drive component; 431. Protective shell; 432. Rotating shaft; 433. Driven gear; 434. Rotating rod; 4341. Fixed sleeve; 4342. Beating belt; 435. Transmission gear; 436. Servo motor; 5. Float; 51. Air chamber; 52. Vertical groove; 53. Scraper bar. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] Example 1 This embodiment provides a liquid level measuring device suitable for urea solution storage tanks, such as... Figures 1-9 As shown, the liquid level measuring device includes a measuring tube 1, a magnetic flip plate 2 installed on the measuring tube 1, and a magnetic float 3 slidably disposed inside the measuring tube 1 for matching the magnetic flip plate 2. The bottom of the measuring tube 1 is provided with an inlet pipe 11 for communicating with the outlet of the urea solution storage tank, and the inlet pipe 11 is arranged obliquely downward. The top of the measuring tube 1 is provided with an outlet pipe 12 for communicating with the inlet of the urea solution storage tank. Control valves 13 are installed on both the inlet pipe 11 and the outlet pipe 12. In order to facilitate the cleaning of crystals on the inner wall of the measuring tube 1, a first cleaning mechanism 4 is provided on the measuring tube 1. The first cleaning mechanism 4 includes a drive disk 41 disposed at the top and bottom of the measuring tube 1, a scraper 42 fixedly connected between the two drive disks 41 and in contact with the inner wall of the measuring tube 1, and a drive component 43 for driving the two drive disks 41 to rotate synchronously. The first cleaning mechanism 4 utilizes a drive unit 43 to drive two drive discs 41 and a scraper 42 to rotate synchronously. The scraper 42 rotates circumferentially along the inner wall of the measuring tube 1, effectively removing crystals from the inner wall and preventing crystallization from reducing the diameter of the measuring tube 1 and affecting the normal movement of the magnetic float 3. This improves the accuracy of liquid level measurement and is suitable not only for urea solution storage tanks but also for liquid level measurement of other easily crystallizing liquids. The drive unit 43 drives two drive discs 41 to rotate synchronously. As the drive discs 41 rotate, they drive the scraper 42 to rotate circumferentially along the inner wall of the measuring tube 1. The scraper 42 contacts the inner wall of the measuring tube 1, directly scraping away the crystals adsorbed on the inner wall during rotation. This ensures unobstructed internal space of the measuring tube 1, allowing the magnetic float 3 to slide normally up and down with the liquid level.

[0025] To reduce crystal adsorption: the measuring tube 1, scraper 42, and drive disk 41 are all made of urea-resistant stainless steel, and the inner wall of the measuring tube 1, the outer wall of the scraper 42, and the outer wall of the drive disk 41 are all smoothly polished. This reduces the probability of crystal adsorption on the inner wall of the measuring tube 1, the outer wall of the scraper 42, and the outer wall of the drive disk 41, reducing the frequency of cleaning, while improving the corrosion resistance of components and extending the service life of the device. The measuring tube 1, scraper 42, and drive disk 41 are made of urea-resistant stainless steel, which can resist the corrosive effect of urea solution; and the contact surfaces of the three are all smoothly polished, reducing the contact area and adhesion between crystals and the surface, reducing the possibility of crystals adhering to the surface, and reducing the problem of crystal accumulation from the source.

[0026] To improve scraping efficiency, the scraper 42 has a "V" shape at one end near the inner wall of the measuring tube 1 and a square shape at the other end. This improves the scraping efficiency of crystals on the inner wall of the measuring tube 1, ensuring more thorough removal of crystals and preventing residual crystals from affecting subsequent measurements. The "V"-shaped end of the scraper 42 near the inner wall of the measuring tube 1 concentrates the crystals towards the tip when rotating circumferentially, generating greater scraping force and quickly peeling off stubborn crystals; the square end can perform secondary cleaning on the area scraped by the "V" end, covering more inner wall area, reducing crystal residue, and improving the overall scraping effect.

[0027] The driving component 43 includes a protective shell 431 fixedly connected to the upper and lower ends of the measuring tube 1 and a servo motor 436. The opposite ends of the two driving disks 41 are fixedly connected to a rotating shaft 432. The end of the rotating shaft 432 away from the driving disk 41 passes through the measuring tube 1 and extends into the protective shell 431. A driven gear 433 is fixedly mounted on the rotating shaft 432 inside the protective shell 431. A rotating rod 434 is arranged parallel to the side of the measuring tube 1 and passes through the protective shell 431. One end of the rotating rod 434 is fixedly connected to the output end of the servo motor 436 mounted on the protective shell 431. A transmission gear 435 is fixedly mounted on the rotating rod 434 inside the protective shell 431. The transmission gear 435 meshes with the driven gear 433. The servo motor 436, rotating shaft 432, driven gear 433, rotating rod 434, and transmission gear 435 work together to provide a stable and synchronous driving force to the drive disk 41, ensuring that the scraper 42 rotates at a uniform speed along the inner wall of the measuring tube 1, thus guaranteeing a stable cleaning effect. Meanwhile, the protective shell 431 protects the internal transmission components from external interference and corrosion. When the servo motor 436 is started, its output drives the rotating rod 434 to rotate. The rotating rod 434 drives the transmission gear 435, which is fixedly mounted on it, to rotate. The transmission gear 435 meshes with the driven gear 433, which is fixedly mounted on the rotating shaft 432, thereby driving the rotating shaft 432 to rotate. The rotating shaft 432 is fixedly connected to the drive disk 41, ultimately driving the two drive disks 41 to rotate synchronously, enabling the scraper 42 to perform circumferential cleaning motion along the inner wall of the measuring tube 1. The protective shell 431 encloses the driven gear 433, transmission gear 435, and other components, providing protection.

[0028] To prevent liquid leakage: a mechanical seal is installed between the rotating shaft 432 and the measuring tube 1, and the rotating rod 434 is connected to the protective shell 431 via a sealed bearing. This prevents leakage of urea solution or other liquids from the measuring tube 1, ensuring the sealing and safety of the device operation, and avoiding liquid corrosion of external components or environmental pollution. The mechanical seal between the rotating shaft 432 and the measuring tube 1, through the tight fit of the sealing surfaces, prevents liquid inside the measuring tube 1 from leaking outward along the gap between the rotating shaft 432 and the tube wall; the sealed bearing between the rotating rod 434 and the protective shell 431, while ensuring the flexible rotation of the rotating rod 434, uses the bearing's sealing structure to prevent external impurities from entering the protective shell 431, and also prevents leakage of any small amount of liquid that may exist inside the protective shell 431. This double sealing ensures the device's airtightness.

[0029] To improve cleaning effectiveness, multiple fixed sleeves 4341 are equidistantly connected to the rotating rod 434 along its length, and multiple tapping belts 4342 are fixedly connected to the outer wall of the fixed sleeves 4341. Through the cooperation of the fixed sleeves 4341 and the tapping belts 4342 on the rotating rod 434, the rotation of the rotating rod 434 drives the tapping belts 4342 to rotate, causing the tapping belts 4342 to strike the outer wall of the measuring tube 1 during rotation, forming vibration waves, which further enhances the removal effect on the crystals on the inner wall of the measuring tube 1. Combined with the scraper 42, it achieves dual cleaning of "scraping + vibration peeling", reducing stubborn crystal residue. When the rotating rod 434 rotates, it drives the fixed sleeve 4341, which is fixedly mounted on it, to rotate synchronously. The fixed sleeve 4341 drives the tapping belt 4342 connected to the outer wall to rotate. During the rotation, the tapping belt 4342 continuously taps the outer wall of the measuring tube 1. The vibration wave generated by the tapping is transmitted to the inner wall of the measuring tube 1, causing the stubborn crystals adsorbed on the inner wall that have not been completely scraped off by the scraper 42 to fall off due to the vibration, thereby improving the overall cleaning effect.

[0030] To facilitate the collection and discharge of crystals inside the measuring tube 1, an arc-shaped bend 14 is fixedly connected to the bottom of the measuring tube 1, and a drain valve 15 is fixedly installed at the bottom of the arc-shaped bend 14. This facilitates the collection and discharge of crystals scraped from inside the measuring tube 1, preventing crystals from accumulating at the bottom of the measuring tube 1, ensuring unobstructed flow inside the measuring tube 1, and reducing the difficulty of subsequent cleaning. The crystals scraped by the scraper 42 fall downwards under the action of gravity and eventually fall into the arc-shaped bend 14 fixedly connected to the bottom of the measuring tube 1, where the arc-shaped bend 14 can temporarily store the crystals. When it is necessary to discharge the crystals, the drain valve 15 at the bottom of the arc-shaped bend 14 is opened, and the stored crystals can be discharged outside the device through the drain valve 15, achieving centralized processing of the crystals.

[0031] Example 2 Unlike Embodiment 1, to facilitate the removal of crystals adsorbed on the scraper 42, a float ball 5 is fixedly sleeved on the outside of the magnetic float 3. Air chambers 51 are provided at the top and bottom of the float ball 5, and a vertical groove 52 is formed on the outer side of the float ball 5. The float ball 5 slides onto the scraper 42 through the vertical groove 52. Multiple polyurethane crystal scraping strips 53 are evenly spaced along the vertical direction within the vertical groove 52, and the crystal scraping strips 53 are interference-fitted with the scraper 42. With the cooperation of the liquid, the magnetic float 3, and the float ball 5, the float ball 5 drives the crystal scraping strips 53 to move up and down along the scraper 42, automatically removing the crystals adsorbed on the scraper 42. This prevents crystals from accumulating on the surface of the scraper 42, which could cause the scraper 42 to jam or reduce the cleaning effect, further ensuring stable operation of the device and accurate liquid level measurement. The float 5 is slidably mounted on the scraper 42 through the vertical groove 52, and the float 5 is fixedly connected to the magnetic float 3. When the liquid level in the storage tank changes, the magnetic float 3 drives the float 5 to move up and down along the measuring tube 1. During the movement of the float 5, the crystal scraping strip 53, which is interference-fitted with the scraper 42 in the vertical groove 52, slides up and down along the scraper 42 in sync. The crystal scraping strip 53 is in close contact with the scraper 42 and scrapes away the crystals adsorbed on the surface of the scraper 42 during the sliding process. The air cavity 51 in the float 5 can adjust the buoyancy of the float 5 to ensure that the float 5 can move stably with the magnetic float 3.

[0032] The float 5 is made of aging-resistant nitrile rubber with a polytetrafluoroethylene (PTFE) anti-stick coating. The float 5 is cylindrical in the middle and tapered at both ends. This design enhances the float 5's aging resistance and anti-stick properties, reduces crystal adhesion to its surface, and optimizes its force-bearing structure, reducing resistance during vertical movement and ensuring stable synchronous movement with the magnetic float 3. The aging-resistant nitrile rubber construction of the float 5 resists aging wear and tear during long-term use, extending its service life. The PTFE anti-stick coating reduces the adhesion of crystals to the float 5 surface, preventing crystals from adhering to the float 5 and affecting buoyancy. The cylindrical structure in the middle of the float 5 ensures stable cooperation with the vertical groove 52 of the scraper 42, while the tapered design at both ends reduces liquid resistance during vertical movement, allowing the float 5 to respond flexibly and stably to changes in liquid level with the magnetic float 3.

[0033] The shape of the scraping strip 53 is consistent with the outer wall shape of the scraper 42, and the cross-section of the scraping strip 53 is triangular. This ensures that the scraping strip 53 fully adheres to the outer wall of the scraper 42, improving the removal effect on the surface of the scraper 42 and avoiding crystal residue due to loose adhesion. The shape of the scraping strip 53, consistent with the outer wall shape of the scraper 42, allows for all-round contact between the scraping strip 53 and the surface of the scraper 42, eliminating cleaning dead corners; the triangular cross-section design makes the scraping end of the scraping strip 53 sharper, enabling more efficient removal of crystals from the surface of the scraper 42 when sliding up and down along the scraper 42, further improving the cleaning effect.

[0034] The wiring diagram of the servo motor 436 in this application is common knowledge in the field, and its working principle is a well-known technology. The appropriate model is selected according to the actual use. Therefore, the control method and wiring layout of the servo motor 436 will not be explained in detail.

[0035] The control method of this application is through a controller. The control circuit of the controller can be implemented by a person skilled in the art through simple programming. The power supply is also common knowledge in the art. Since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0036] All electrical components mentioned in the text are electrically connected to the main controller and power supply. The main controller can be a conventional and known device such as a computer, and the existing publicly available power connection technology will not be elaborated in the text.

[0037] It should be noted that many of the standard parts used in this application are available on the market, while non-standard parts can be specially customized. The connection method used in this application is also a very common method in the mechanical field, and will not be described in detail here.

[0038] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A liquid level measuring device suitable for urea solution storage tanks, characterized in that: The device includes a measuring tube (1), a magnetic flip plate (2) installed on the measuring tube (1), and a magnetic float (3) slidably disposed in the measuring tube (1) for matching the magnetic flip plate (2). The bottom of the measuring tube (1) is provided with an inlet pipe (11) for communicating with the outlet of the urea solution storage tank, and the inlet pipe (11) is arranged obliquely downward. The top of the measuring tube (1) is provided with an outlet pipe (12) for communicating with the inlet of the urea solution storage tank. Both the inlet pipe (11) and the outlet pipe (12) are equipped with control valves (13). The measuring tube (1) is provided with a first cleaning mechanism (4), which includes a drive disk (41) disposed at the top and bottom of the measuring tube (1), a scraper (42) fixedly connected between the two drive disks (41) and in contact with the inner wall of the measuring tube (1), and a drive component (43) for driving the two drive disks (41) to rotate synchronously.

2. The liquid level measuring device for urea solution storage tanks according to claim 1, characterized in that: The measuring tube (1), scraper (42) and drive disk (41) are all made of stainless steel resistant to urea corrosion, and the inner wall of the measuring tube (1), the outer wall of the scraper (42) and the outer wall of the drive disk (41) are all smoothly polished.

3. The liquid level measuring device for urea solution storage tanks according to claim 1, characterized in that: The scraper (42) is V-shaped at one end near the inner wall of the measuring tube (1) and square-shaped at the other end.

4. The liquid level measuring device for urea solution storage tanks according to claim 1, characterized in that: The driving component (43) includes a protective shell (431) fixedly connected to the upper and lower ends of the measuring tube (1) and a servo motor (436). The two driving disks (41) are fixedly connected to a rotating shaft (432) at opposite ends. The end of the rotating shaft (432) away from the driving disk (41) passes through the measuring tube (1) and extends into the protective shell (431). A driven gear (433) fixedly mounted on the rotating shaft (432) is provided inside the protective shell (431). A rotating rod (434) passing through the protective shell (431) is arranged parallel to the side of the measuring tube (1). One end of the rotating rod (434) is fixedly connected to the output end of the servo motor (436) mounted on the protective shell (431). A transmission gear (435) fixedly mounted on the rotating rod (434) is provided inside the protective shell (431). The transmission gear (435) meshes with the driven gear (433).

5. The liquid level measuring device for urea solution storage tanks according to claim 4, characterized in that: A mechanical seal is provided between the rotating shaft (432) and the measuring tube (1), and the rotating rod (434) is connected to the protective shell (431) through a sealed bearing.

6. The liquid level measuring device for urea solution storage tanks according to claim 4, characterized in that: Multiple fixed sleeves (4341) are fixedly connected at equal intervals along the length direction of the rotating rod (434), and multiple beater belts (4342) are fixedly connected to the outer wall of the fixed sleeves (4341).

7. The liquid level measuring device for urea solution storage tanks according to claim 1, characterized in that: The bottom of the measuring tube (1) is fixedly connected to an arc-shaped bend (14), and a drain valve (15) is fixedly installed at the bottom of the arc-shaped bend (14).

8. The liquid level measuring device for urea solution storage tanks according to claim 1, characterized in that: The magnetic float (3) is fixedly fitted with a float ball (5). The top and bottom of the float ball (5) are provided with air chambers (51). The float ball (5) has a vertical groove (52) on its outer side. The float ball (5) is slidably fitted on the scraper (42) through the vertical groove (52). Multiple polyurethane scraping strips (53) are equidistantly arranged in the vertical groove (52) along its vertical direction. The scraping strips (53) are interference-fitted with the scraper (42).

9. The liquid level measuring device for urea solution storage tanks according to claim 8, characterized in that: The float (5) is made of aging-resistant nitrile rubber and coated with a polytetrafluoroethylene anti-stick layer. The middle part of the float (5) is cylindrical and the two ends are conical arc surfaces.

10. The liquid level measuring device for urea solution storage tanks according to claim 8, characterized in that: The shape of the scraper strip (53) is consistent with the outer wall shape of the scraper (42), and the cross section of the scraper strip (53) is triangular.

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