A ship circulating water tank liquid level display device and a method of using the same

Abstract

This invention provides a liquid level display device for a ship's circulating water tank and its usage method, belonging to the technical field of circulating water tanks. The device includes a tank body and further comprises: a liquid level tube disposed on the outside of the tank body, with flanges at both ends connecting it to the interior of the tank body; a float movably disposed within the liquid level tube; a glass tube fixed to the outside of the liquid level tube by clips, with graduation lines on the outside of the glass tube and a magnet movably disposed inside the glass tube, magnetically coupled to the float; and a descaling component disposed inside the liquid level tube for cleaning scale formed on the inner wall of the liquid level tube. This invention achieves clear liquid level display through the magnetic coupling between the magnet inside the external glass tube and the float inside the liquid level tube, solving the problems of difficulty in observing colorless liquids in a liquid level mirror and the easy damage and leakage of traditional liquid level mirrors during cleaning, providing a maintainable and highly visible liquid level display system.

Description

Technical Field

[0001] This invention relates to the field of circulating water tank technology, specifically to a liquid level display device for a ship's circulating water tank and its usage method. Background Technology

[0002] Shipboard circulating water tanks are key equipment in a ship's water supply system, primarily used to store and regulate circulating water to ensure the stable operation of the ship's power and cooling systems. The circulating water tanks maintain water pressure using compressed air, providing a stable supply of fresh or seawater to the ship.

[0003] The most basic and important function of a level gauge is to observe liquid levels. Currently, the liquid levels inside the tanks for freshwater and seawater pressure tanks on ships are generally observed through level gauges. However, with existing level gauges, seawater must enter the gauge. Since water is colorless, it is difficult to observe the liquid level. Furthermore, the entry of seawater over time inevitably causes the level gauge to become clogged, posing a risk of damage during cleaning. After cleaning, the level gauge is prone to leakage, requiring rework, which is time-consuming and labor-intensive. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art, and to propose a liquid level display device for ship circulating water tanks and its usage method.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A water level display device for a ship's circulating water tank includes a tank body and further includes:

[0007] A liquid level pipe is installed on the outside of the water tank body, and flanges are provided at both ends of the liquid level pipe to connect with the inside of the water tank body.

[0008] A float, which is movably disposed inside the liquid level tube;

[0009] A glass tube is fixed to the outside of a liquid level tube by a snap fastener. The outside of the glass tube is provided with scale lines, and a magnet that is magnetically coupled to a float is movably disposed inside the glass tube.

[0010] And a descaling component, which is installed inside the level tube and is used to clean the scale generated on the inner wall of the level tube.

[0011] Preferably, the liquid level pipe includes a straight pipe and bent pipes disposed at both ends of the straight pipe. The two bent pipes are respectively connected to the inside of the water tank body through flanges. The top and bottom of the straight pipe are the highest and lowest points of the liquid level warning inside the water tank body, respectively.

[0012] Preferably, the float includes two frustums and a strong magnet disposed within the frustums. A plurality of circumferentially arranged limiting guide grooves are fixed inside the liquid level tube. The frustums are provided with limiting components that cooperate with the limiting guide grooves. There is a gap between the frustums and the inner wall of the liquid level tube.

[0013] Preferably, the limiting member includes an elastic telescopic rod fixed to the frustum body and a connecting ball fixed to the end of the elastic telescopic rod.

[0014] Preferably, the descaling assembly includes a first electric telescopic rod fixed to the top of the liquid level tube, a connecting seat fixed to the lower side of the first electric telescopic rod via a connecting rod, a second electric telescopic rod evenly arranged in a circle on the connecting seat, and an arc-shaped scraper disposed at the bottom of the second electric telescopic rod, wherein the arc-shaped scraper moves against the inner wall of the liquid level tube.

[0015] Preferably, a scale guide tube is rotatably connected between the bent tube and the straight tube at the bottom of the liquid level tube, and the scale guide tube has a connecting opening for connecting the bent tube and the straight tube.

[0016] Preferably, a sealing shaft seat is provided on the bent pipe at the bottom of the liquid level pipe, a sealing ring is provided between the sealing shaft seat and the scale guide pipe, and a scale guide opening is provided on the sealing shaft seat to cooperate with the communication opening.

[0017] Preferably, the glass tube is provided with a stop seat at both the upper and lower ends, a spiral track is fixed inside the glass tube, and the magnet is slidably connected to the spiral track.

[0018] Preferably, the liquid level tube is made of stainless steel, and the inner wall of the liquid level tube is provided with an anti-scaling coating, which is a polytetrafluoroethylene or diamond-like carbon coating, and the surface of the magnet is coated with a high-visibility fluorescent coating.

[0019] This invention also discloses a method for using a liquid level display device for a ship's circulating water tank, comprising the following steps:

[0020] S1: Liquid level reading: After water enters the water tank, the water slowly flows into the liquid level pipe through the bottom flange, pushing the float to rise. The float drives the magnet inside the glass tube to move upward synchronously through magnetic coupling. Keep the line of sight level with the scale line and read the scale value corresponding to the top of the magnet, which is the actual liquid level height inside the water tank. Because the surface of the magnet is coated with a high-visibility fluorescent coating, the liquid level can be clearly identified even in low light environments.

[0021] S2: Descaling maintenance operation:

[0022] Preparation stage: Close the inlet and outlet valves of the water tank body, open the drain valve to drain the water in the water tank body, release the internal pressure, and after confirming that the pressure gauge reading is zero, release the rotation restriction of the sealing shaft seat and the scale guide pipe. After the float ball is no longer buoyant, it slides down to the bottom of the straight pipe.

[0023] Scale guide tube adjustment: Rotate the scale guide tube to make the connecting opening coincide with the scale guide opening, forming a scale removal and sewage discharge channel;

[0024] S3: Descaling execution:

[0025] The first electric telescopic rod extends, causing the connecting seat to move down, while the second electric telescopic rod drives the arc-shaped scraper to scrape away the scale on the inner wall of the straight pipe.

[0026] The first electric telescopic rod will stop extending until the bottom of the descaling component moves to the float.

[0027] Step-by-step descaling: Control each of the second electric telescopic rods to work one by one, avoiding simultaneous pressure that would cause the connecting ball on the outside of the float to be stressed, causing the elastic telescopic rods to contract simultaneously and the float to fall off. Ensure that at least two symmetrically arranged limiting components always maintain the limiting effect on the float to prevent the float from falling off.

[0028] S4: Cleaning and finishing: The scraped scale is discharged through the scale guide pipe. Control the first and second electric telescopic rods to retract. After completion, restore the scale guide pipe to a sealed state.

[0029] As can be seen from the above technical solutions, the present invention has the following beneficial effects:

[0030] 1. In this invention, by adopting the principle of magnetic coupling non-contact transmission, combined with a high-visibility fluorescent coated magnet and clear scale lines, the liquid level reading is made more intuitive and accurate, solving the problems of colorless liquids being difficult to observe in the liquid level mirror and traditional liquid level mirrors being easily damaged and prone to water leakage during cleaning, thus providing a maintainable liquid level display system.

[0031] 2. In this invention, the maintenance mode of the traditional level gauge is changed by setting up a descaling component. By using an electrically controlled arc scraper and a rotating scale guide tube design, a semi-automatic descaling operation is achieved, which greatly reduces the time and frequency of manual cleaning. It also solves the problem that the increased and thickened scale on the inner wall of the level tube consumes magnetic energy and affects the magnetic force of the float on the magnet.

[0032] 3. In this invention, by setting a limiting guide groove, the float is laterally suppressed, and the connecting ball at the end of the elastic telescopic rod is placed in the limiting guide groove, so that even if there is some scale on the inner wall of the liquid level tube, the elastic telescopic rod can freely extend and retract as the float moves, avoiding scale from hindering the stable movement of the float.

[0033] 4. In this invention, by sliding the magnet along the spiral track, when the ship tilts or sways, the spiral track can limit the axial movement of the magnet in the glass tube, converting the axial movement of the magnet into rotational movement. The moment of inertia is used to offset part of the impact energy, preventing the magnet from suddenly falling or soaring due to inertia. This prevents the magnet from quickly moving out of the magnetic field of the float. When the liquid level inside the tank is stable, the magnet returns to the same height as the float under magnetic action, ensuring the stability and accuracy of the liquid level indication. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 This is a schematic diagram of the external structure of the liquid level tube of the present invention;

[0036] Figure 3 This is a schematic diagram of the glass tube structure of the present invention;

[0037] Figure 4 This is a schematic cross-sectional view of the glass tube of the present invention;

[0038] Figure 5 For the present invention Figure 4 Enlarged structural diagram of section A in the middle;

[0039] Figure 6 This is a schematic cross-sectional view of the liquid level tube of the present invention;

[0040] Figure 7 This is a schematic diagram of the cross-sectional structure of the float of the present invention placed inside a straight tube;

[0041] Figure 8 This is a schematic diagram of the structure of the float of the present invention;

[0042] Figure 9 This is a schematic cross-sectional view of the float of the present invention;

[0043] Figure 10 This is a schematic diagram of the descaling component of the present invention;

[0044] Figure 11 This is a schematic diagram of the structure when the connecting opening and the scale-guiding opening of the present invention coincide.

[0045] In the diagram: 1. Water tank body; 2. Liquid level pipe; 201. Straight pipe; 202. Bent pipe; 3. Flange; 4. Float; 401. Frustum; 402. Strong magnet; 5. Glass tube; 501. Stop seat; 502. Spiral track; 6. Magnet; 7. Limiting guide groove; 8. Limiting component; 801. Elastic telescopic rod; 802. Connecting ball; 9. First electric telescopic rod; 901. Connecting seat; 902. Second electric telescopic rod; 903. Arc-shaped scraper; 10. Scaling guide pipe; 1001. Connecting opening; 11. Sealing shaft seat; 111. Scaling guide opening. Detailed Implementation

[0046] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0047] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0048] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 This embodiment provides a liquid level display device for a ship's circulating water tank, including a tank body 1, and further including: a liquid level pipe 2, a float 4, a glass tube 5, and a descaling assembly; the liquid level pipe 2 is located on the outside of the tank body 1, and both ends of the liquid level pipe 2 are provided with flanges 3 that connect to the inside of the tank body 1, forming a communicating vessel so that the liquid level inside the water tank body 1 is consistent with the actual liquid level height inside the tank body 1; the liquid level pipe 2 typically includes a straight pipe 201 and bent pipes 202 at both ends, with the straight pipe 201 corresponding to the highest and lowest points of the liquid level warning in the tank body 1; the float 4 is movably installed inside the liquid level pipe 2, floating... The float 4 has a strong magnet 402 embedded inside, and its outer shell is designed as a combination of two frustums 401. A gap is left between the frustums 401 and the inner wall of the liquid level tube 2 to reduce movement resistance. The float 4 cooperates with the limiting member 8 on it and the pre-set limiting guide groove 7 in the liquid level tube 2 to ensure that the float 4 can only move smoothly up and down along the limiting guide groove 7 and prevent deflection or jamming. The glass tube 5 is fixed to the outside of the liquid level tube 2 by a buckle. The outside of the glass tube 5 is provided with scale lines for direct reading of the liquid level height. A magnet 6 is movably installed inside the glass tube 5 and magnetically coupled to the float 4. The descaling component is installed inside the liquid level tube 2 to clean the scale generated on the inner wall of the liquid level tube 2.

[0049] Specifically, when the liquid level inside the water tank body 1 changes, the liquid level in the level tube 2 changes synchronously, causing the float 4 to float up and down accordingly. The strong magnet 402 inside the float 4 drives the magnet 6 inside the glass tube 5 to move through magnetic coupling. By observing the position of the magnet 6 in the graduated glass tube 5, the operator can read the real-time liquid level height inside the water tank body 1. The non-contact transmission method of magnetic coupling accurately transmits the displacement of the float 4 in the level tube 2 to the external display component, that is, the position of the magnet 6 in the glass tube 5. This solves the problems of colorless liquid being difficult to observe in the level mirror and the easy damage and water leakage of traditional level mirrors during cleaning, providing a maintainable and highly visible level display system.

[0050] Reference Figure 6 , Figure 7 and Figure 8 As a preferred technical solution in this embodiment, the limiting member 8 includes an elastic telescopic rod 801 fixed on the frustum body 401 and a connecting ball 802 fixed at the end of the elastic telescopic rod 801. The elastic telescopic rod 801 contains a spring mechanism, which allows the rod to elastically extend and retract in the axial direction, providing a continuous outward pressing force to the connecting ball 802, and also allowing it to retract under the action of external force. The connecting ball 802 is made of a wear-resistant material with a low coefficient of friction. The spherical design helps to reduce the contact area, reduce the resistance to movement, and better adapt to the irregular surface in the limiting guide groove 7. The connecting ball 802 is embedded in the limiting guide groove 7 corresponding to the inner wall of the liquid level tube 2, thereby restricting the movement of the float 4 in the vertical direction and preventing it from rotating or swaying laterally.

[0051] Specifically, when the liquid level in the water tank body 1 rises or falls, the float 4 moves vertically within the liquid level tube 2. At this time, the connecting ball 802 of the limiting component 8 rolls or slides smoothly within the limiting guide groove 7. The pre-tightening force provided by the elastic telescopic rod 801 ensures continuous contact between the connecting ball 802 and the guide groove wall, thereby ensuring that the float 4 moves smoothly without shaking. As the water tank is used for a long time, if scale or impurities accumulate in the limiting guide groove 7 on the inner wall of the liquid level tube 2, causing the guide groove to narrow locally or protrude, the elastic telescopic rod 801 will compress and retract under the action of resistance, allowing the connecting ball 802 to temporarily avoid the obstacle point. After passing the obstacle point, the elastic telescopic rod 801 will quickly push the connecting ball 802 back to its original position, so that it re-contacts the effective guide surface of the limiting guide groove 7, greatly reducing the risk of the float 4 being stuck by scale.

[0052] Reference Figure 6 and Figure 10As a preferred technical solution in this embodiment, the descaling assembly includes a first electric telescopic rod 9 fixed to the top of the liquid level tube 2, a connecting seat 901 fixed to the lower side of the first electric telescopic rod 9 via a connecting rod, a second electric telescopic rod 902 evenly arranged on the connecting seat 901 in a circular pattern, and an arc-shaped scraper 903 disposed at the bottom of the second electric telescopic rod 902. The arc-shaped scraper 903 moves against and fully fits the inner wall of the liquid level tube 2. The first electric telescopic rod 9 is fixed to the top outer side of the liquid level tube 2, and its telescopic rod extends vertically downward into the interior of the liquid level tube 2, serving as the main drive unit of the descaling assembly, providing the power and stroke for the entire scraping component to move up and down.

[0053] Specifically, after the water tank body 1 has been used for a long time, the scale in the liquid level tube 2 may gradually accumulate and thicken. The iron oxide in the scale has a high magnetic permeability, and the scale layer will cause the alternating magnetic field to generate eddy currents, which consume magnetic energy and affect the magnetic force of the float 4 on the magnet 6. The magnet 6 will respond with delay or get stuck. Therefore, it is necessary to descale the liquid level tube 2, that is, the straight tube 201 in which the float 4 moves.

[0054] When the descaling component is working, it first discharges the water in the water tank body 1. After the float ball 4 loses buoyancy, it slides down to the bottom of the straight pipe 201. It controls the first electric telescopic rod 9 to extend, which drives the connecting seat 901 to move down. The second electric telescopic rod 902 drives the arc-shaped scraper 903 to scrape off the scale on the inner wall of the straight pipe 201. The scraped scale slides down along the gap between the float ball 4 and the straight pipe 201 until the bottom of the descaling component moves to the float ball 4, and the first electric telescopic rod 9 stops extending.

[0055] Subsequently, each of the second electric telescopic rods 902 is controlled to work one by one. Each second electric telescopic rod 902 drives the arc-shaped scraper 903 to move down to perform a scraping action and then moves back. Then the next second electric telescopic rod 902 starts to work, scraping away the scale or impurities on the inner wall of the straight pipe 201 and the inner wall of the limiting guide groove 7. This avoids the simultaneous pressure causing the connecting ball 802 on the outside of the float 4 to be stressed, which would cause the elastic telescopic rods 801 to contract at the same time and cause the float 4 to fall off. This ensures that at least two symmetrically arranged limiting members 8 always maintain the limiting effect on the float 4 and prevent the float 4 from falling off.

[0056] Reference Figure 1 , Figure 2 , Figure 6 and Figure 11 As a preferred technical solution in this embodiment, a scale guide tube 10 is rotatably connected between the bent tube 202 and the straight tube 201 at the bottom of the liquid level tube 2. The scale guide tube 10 is installed between the bent tube 202 and the straight tube 201 at the bottom of the liquid level tube 2 by a rotatable connection, so that it can be used as part of the fluid channel and as a movable functional component. The scale guide tube 10 is provided with a connecting opening 1001 for connecting the bent tube 202 and the straight tube 201.

[0057] Furthermore, a sealing bearing 11 is provided on the bent pipe 202 at the bottom of the liquid level pipe 2 to provide rotational support for the scale guide pipe 10; a sealing ring is provided between the sealing bearing 11 and the scale guide pipe 10. The sealing ring is usually made of O-ring or other corrosion-resistant and wear-resistant elastic sealing material to ensure that the connection is completely sealed when the scale guide pipe 10 is in a non-drainage state, with no risk of leakage. The sealing bearing 11 is provided with a scale guide opening 111 that matches the connecting opening 1001. When the scale guide pipe 10 is rotated to a specific angle, the connecting opening 1001 and the scale guide opening 111 coincide to form a drainage path and block the fluid passage between the straight pipe 201 and the lower bent pipe 202.

[0058] Specifically, before starting the descaling process, close the inlet and outlet valves of the water tank body 1, open the drain valve to drain the water in the water tank body 1, release the internal pressure, and after confirming that the pressure gauge reading is zero, release the rotation restriction between the sealing shaft seat 11 and the scale guide tube 10, such as the locking screw or handle in the prior art; when the scale guide tube 10 rotates to a specific angle, the connecting opening 1001 on its pipe wall and the scale guide opening 111 on the sealing shaft seat 11 are completely overlapped and aligned. At this time, a dedicated sewage discharge channel from the straight pipe 201 through the scale guide tube 10 to the sealing shaft seat 11 is successfully opened. When the descaling component starts to work, the scale fragments and dirt scraped off fall naturally downwards under the action of gravity. These dirt are smoothly discharged from the scale guide tube 10 through the channel formed by the opened connecting opening 1001 and the scale guide opening 111 and enter the designated collection container or sewage discharge system.

[0059] After the descaling operation is completed, rotate the scale guide tube 10 in the reverse direction so that its connecting opening 1001 is misaligned with the scale guide opening 111 of the sealing shaft seat 11. In this state, the tube wall of the scale guide tube 10 itself blocks the channel, restoring its function as a normal liquid level channel. Finally, re-lock the scale guide tube 10 and the sealing shaft seat 11. Relying on the elastic deformation of the sealing ring, an effective seal is formed between the two to ensure that the device has no leakage under normal liquid level monitoring conditions.

[0060] Reference Figure 4 and Figure 5 As a preferred technical solution in this embodiment, both the upper and lower ends of the glass tube 5 are provided with stop seats 501 to restrict the magnet 6 from moving out of the glass tube 5. A spiral track 502 is fixed inside the glass tube 5, and the magnet 6 is slidably connected to the spiral track 502.

[0061] Specifically, when the float 4 rises and falls with the liquid level, the magnet 6 is driven to move up or down along the trajectory of the spiral track 502 through magnetic coupling. Since the track is spiral, the movement path of the magnet 6 is actually rotating around the central axis to rise or fall, rather than simply going straight up and down. When the ship rolls, pitches, or tilts, the glass tube 5 will also tilt. If the magnet 6 is in the smooth glass tube 5, it is very easy for it to slide and fall due to inertia under the action of gravity, and then leave the magnetic range of the float 4. This would cause the magnet 6 to slide directly to the bottom of the glass tube 5, making it impossible to accurately indicate the liquid level in the tank body 1. The spiral track 502 can restrict the magnet 6 axially, effectively suppressing the accidental sliding of the magnet 6 and keeping it basically at the real-time height corresponding to the magnetic coupling of the float 4, ensuring the immediacy and accuracy of the reading.

[0062] Reference Figure 1 , Figure 5 and Figure 6 As a preferred technical solution in this embodiment, the liquid level tube 2 is made of stainless steel, and the inner wall of the liquid level tube 2 is provided with an anti-scaling coating, which is polytetrafluoroethylene or diamond-like carbon coating, and the surface of the magnet 6 is coated with a high-visibility fluorescent coating.

[0063] Specifically, the main body of the level tube 2 is made of austenitic stainless steel. This type of material has excellent mechanical strength and good corrosion resistance, and can resist long-term erosion from seawater, fresh water and water vapor, providing a solid foundation for the entire device. The polytetrafluoroethylene coating is known for its extremely low surface energy and coefficient of friction, and has recognized excellent non-stick and hydrophobic properties. The diamond-like carbon coating combines the high hardness of diamond and the lubricity of graphite, making it extremely smooth, wear-resistant and chemically inert. Scale-forming substances in the water have difficulty adhering, greatly inhibiting the formation and accumulation of scale, and reducing the workload and maintenance frequency of the active descaling components. When reading the level, regardless of the ambient light, the fluorescent coating on the surface of the magnet 6 can absorb light energy (including ultraviolet light) and emit bright and lasting light, making its position very conspicuous inside the glass tube 5, making it easy for the observer to quickly and accurately read the scale.

[0064] This invention also discloses a method for using a liquid level display device for a ship's circulating water tank, comprising the following steps:

[0065] S1: Liquid level reading: After water enters the water tank body 1, the water slowly flows into the liquid level pipe 2 through the bottom flange 3, pushing the float 4 to rise. The float 4 drives the magnet 6 in the glass tube 5 to move upward synchronously through magnetic coupling. Keep the line of sight level with the scale line and read the scale value corresponding to the top of the magnet 6, which is the actual liquid level height in the water tank body 1. Since the surface of the magnet 6 is coated with a high-visibility fluorescent coating, the liquid level can be clearly identified even in low light environment.

[0066] S2: Descaling maintenance operation:

[0067] Preparation stage: Close the inlet and outlet valves of the water tank body 1, open the drain valve to drain the water in the water tank body 1, release the internal pressure, and after confirming that the pressure gauge reading is zero, release the rotation restriction between the sealing shaft seat 11 and the scale guide pipe 10. After the float ball 4 is no longer buoyant, it slides down to the bottom of the straight pipe 201.

[0068] Adjustment of scale guide tube 10: Rotate scale guide tube 10 to make the connecting opening 1001 coincide with the scale guide opening 111, forming a scale removal and sewage discharge channel;

[0069] S3: Descaling execution:

[0070] The first electric telescopic rod 9 is extended, which drives the connecting seat 901 to move down. The second electric telescopic rod 902 drives the arc-shaped scraper 903 to scrape off the scale on the inner wall of the straight pipe 201.

[0071] The first electric telescopic rod 9 will stop extending until the bottom of the descaling component moves to the float 4.

[0072] Step-by-step descaling: Control each second electric telescopic rod 902 to work one by one, avoiding simultaneous pressure that would cause the connecting ball 802 on the outside of the float 4 to be stressed, causing the elastic telescopic rod 801 to contract simultaneously and cause the float 4 to fall off, ensuring that at least two symmetrically arranged limiting parts 8 always maintain the limiting effect on the float 4, preventing the float 4 from falling off.

[0073] S4: Cleaning and finishing: The scraped scale is discharged through the scale guide pipe 10. Control the first electric telescopic rod 9 and the second electric telescopic rod 902 to retract. After completion, restore the scale guide pipe 10 to a sealed state.

[0074] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0075] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A liquid level display device for a ship's circulating water tank, comprising a tank body (1), characterized in that, Also includes: Liquid level pipe (2), the liquid level pipe (2) is set on the outside of the water tank body (1), and both ends of the liquid level pipe (2) are provided with flanges (3) that are connected to the inside of the water tank body (1); A float (4) is movably disposed inside the level tube (2); Glass tube (5), the glass tube (5) is fixed to the outside of the liquid level tube (2) by a buckle, the glass tube (5) is provided with scale lines on the outside of the glass tube (5), and a magnet (6) magnetically coupled to the float (4) is movably arranged inside the glass tube (5). And a descaling component, which is installed inside the level tube (2) and is used to clean the scale generated on the inner wall of the level tube (2); The float (4) includes two frustums (401) and a strong magnet (402) disposed inside the frustums (401). The liquid level tube (2) is fixed with a plurality of circumferentially arranged limiting guide grooves (7). The frustums (401) are provided with limiting members (8) that cooperate with the limiting guide grooves (7). There is a gap between the frustums (401) and the inner wall of the liquid level tube (2). Both the upper and lower ends of the glass tube (5) are provided with stop seats (501), and a spiral track (502) is fixed inside the glass tube (5). The magnet (6) is slidably connected to the spiral track (502). The liquid level tube (2) is made of stainless steel. The inner wall of the liquid level tube (2) is provided with an anti-scaling coating, which is polytetrafluoroethylene or diamond-like carbon coating. The surface of the magnet (6) is coated with a high-visibility fluorescent coating.

2. The ship circulating water tank level display device according to claim 1, characterized in that, The liquid level pipe (2) includes a straight pipe (201) and bent pipes (202) set at both ends of the straight pipe (201). The two bent pipes (202) are connected to the inside of the water tank body (1) through flanges (3). The top and bottom of the straight pipe (201) are the highest and lowest points of the liquid level warning inside the water tank body (1), respectively.

3. The ship circulating water tank level display device according to claim 2, characterized in that, The limiting member (8) includes an elastic telescopic rod (801) fixed on the frustum body (401) and a connecting ball (802) fixed at the end of the elastic telescopic rod (801).

4. The ship circulating water tank level display device according to claim 3, characterized in that, The descaling assembly includes a first electric telescopic rod (9) fixed at the top of the liquid level tube (2), a connecting seat (901) fixed at the lower side of the first electric telescopic rod (9) by a connecting rod, a second electric telescopic rod (902) evenly arranged on the connecting seat (901) in a circular pattern, and an arc-shaped scraper (903) disposed at the bottom of the second electric telescopic rod (902). The arc-shaped scraper (903) moves against the inner wall of the liquid level tube (2).

5. The ship circulating water tank level display device according to claim 4, characterized in that, A scale guide tube (10) is rotatably connected between the bent tube (202) and the straight tube (201) at the bottom of the liquid level tube (2). The scale guide tube (10) has a connecting opening (1001) for connecting the bent tube (202) and the straight tube (201).

6. The ship circulating water tank level display device according to claim 5, characterized in that, A sealing shaft seat (11) is provided on the bent pipe (202) at the bottom of the liquid level pipe (2). A sealing ring is provided between the sealing shaft seat (11) and the scale guide pipe (10). A scale guide opening (111) is provided on the sealing shaft seat (11) to cooperate with the connecting opening (1001).

7. A method of using the ship's circulating water tank level display device according to claim 6, characterized in that, Includes the following steps: S1: Liquid level reading: After water enters the water tank body (1), the water slowly flows into the liquid level pipe (2) through the bottom flange (3), pushing the float (4) to rise. The float (4) drives the magnet (6) in the glass tube (5) to move upward synchronously through magnetic coupling. Keep the line of sight level with the scale line and read the scale value corresponding to the top of the magnet (6), which is the actual liquid level height in the water tank body (1). Since the surface of the magnet (6) is coated with a high-visibility fluorescent coating, the liquid level can be clearly identified even in environments with insufficient light. S2: Descaling maintenance operation: Preparation stage: Close the inlet and outlet valves of the water tank body (1), open the drain valve to drain the water in the water tank body (1), release the internal pressure, and after confirming that the pressure gauge reading is zero, release the rotation restriction between the sealing shaft seat (11) and the scale guide pipe (10), and the float (4) slides down to the bottom of the straight pipe (201) after it is no longer buoyant; Adjustment of scale guide tube (10): Rotate scale guide tube (10) to make the connecting opening (1001) coincide with the scale guide opening (111) to form a scale removal and sewage discharge channel; S3: Descaling execution: The first electric telescopic rod (9) is extended, which drives the connecting seat (901) to move down. The second electric telescopic rod (902) drives the arc-shaped scraper (903) to scrape off the scale on the inner wall of the straight pipe (201). The first electric telescopic rod (9) will stop extending until the bottom of the descaling component moves to the float (4); Step-by-step descaling: Control each of the second electric telescopic rods (902) to work one by one, avoid applying pressure at the same time to cause the connecting ball (802) on the outside of the float (4) to be stressed, causing the elastic telescopic rod (801) to contract at the same time and causing the float (4) to fall off, and ensure that at least two symmetrically arranged limiting parts (8) always maintain the limiting effect on the float (4) to prevent the float (4) from falling off; S4: Cleaning and finishing: The scraped scale is discharged through the scale guide pipe (10), and the first electric telescopic rod (9) and the second electric telescopic rod (902) are controlled to retract. After completion, the scale guide pipe (10) is restored to a sealed state.

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