A water level measuring device for an insulated kettle

Abstract

This application relates to the field of water level measurement and discloses a water level measuring device for a thermos flask. The device includes a stopper, a sliding rod on the stopper, a rotating shaft rotatably mounted on the stopper, a float slidably mounted on the sliding rod along the height of the inner liner, and a limiting structure at the connection between the sliding rod and the float to prevent the float from deflecting. A spiral plate is mounted around the rotating shaft, and a groove is formed in the float, within which the spiral plate slidably mounts. A liquid level display component connected to the rotating shaft is located inside the stopper, converting the rotation angle of the rotating shaft into a liquid level indication. This application allows for the measurement of the water level in the thermos flask by using a float to drive the spiral plate to rotate, which in turn drives the rotating shaft. The liquid level display component displays the water level based on the rotation angle of the rotating shaft, without damaging the thermos flask body. This allows for easy observation of the water level without affecting the thermos flask's insulation performance.

Description

Technical Field

[0001] This application relates to the field of water level measurement, and more particularly to a water level measuring device for a thermos. Background Technology

[0002] A thermos is a container used to hold water and is an indispensable item in people's daily lives.

[0003] Currently, the body of a thermos consists of an inner liner and an outer shell, with a vacuum layer between them. The inner liner is coated with a heat-reflecting coating. When liquid is poured into the thermos and the stopper is inserted into the mouth, the vacuum layer effectively inhibits the conduction of heat in the inner liner, and the heat-reflecting coating reflects the heat back into the inner liner, thus achieving efficient heat preservation.

[0004] Because the body of the thermos is made of stainless steel, the water level inside cannot be observed from the outside. If a float-type water level gauge is embedded in the body of the thermos, with the float positioned inside the liner, the water level can be observed. However, this method compromises the integrity of the thermos body, weakening the heat-reflecting coating and insulation layer inside the liner, thus reducing the thermos's heat retention performance. Summary of the Invention

[0005] In order to facilitate the observation of the water level in a thermos without affecting its heat preservation performance, this application provides a water level measuring device for a thermos.

[0006] The water level measuring device for a thermos provided in this application adopts the following technical solution:

[0007] A water level measuring device for a thermos includes a stopper, a sliding rod on the stopper, and a rotating shaft rotatably mounted on the stopper. Both the sliding rod and the rotating shaft extend into the inner liner of the thermos. A float is slidably mounted on the sliding rod along the height of the inner liner. A limiting structure is provided at the connection between the sliding rod and the float to prevent the float from deflecting. A spiral plate is provided around the rotating shaft, and a groove is formed in the float, with the spiral plate slidably mounted in the groove. A liquid level display component connected to the rotating shaft is provided inside the stopper, and the liquid level display component converts the rotation angle of the rotating shaft into a liquid level indication.

[0008] By adopting the above technical solution, the bottle stopper is inserted into the bottle mouth. The stopper drives the sliding rod and rotating shaft into the inner liner of the thermos. During the sliding rod's entry into the inner liner, the float slides on the sliding rod and remains on the water surface. As the float slides on the sliding rod, it drives the spiral plate to rotate through the slot. The spiral plate then drives the rotating shaft to rotate. Finally, the liquid level display component displays the water level in the thermos based on the angle of rotation of the rotating shaft. When the water level in the thermos changes, the float slides on the sliding rod again, allowing the liquid level display component to show the water level in the thermos in real time. This design allows for water level measurement without damaging the thermos body, thus facilitating the observation of the water level without affecting the thermos's insulation performance.

[0009] Preferably, the bottle stopper has a receiving cavity, and the liquid level display component includes a turntable rotatably disposed in the receiving cavity and a float that slides through the bottle stopper. The center of the turntable is fixedly connected to the rotating shaft, and the top wall of the turntable gradually slopes upward along its circumference to form a spiral receiving platform. The bottom end of the float slides against the spiral receiving platform, and the top end of the float protrudes through the bottle stopper.

[0010] By adopting the above technical solution, when the float slides on the slide bar, the float drives the rotating shaft to rotate through the spiral plate. The rotating shaft drives the turntable in the accommodating cavity to rotate. The turntable drives the spiral receiving platform to rotate. The spiral receiving platform then drives the float to rise and fall inside the bottle stopper. Finally, the water level in the thermos can be quickly determined by the length of the float beyond the bottle stopper.

[0011] Preferably, a scale is provided on the top side wall of the bottle stopper along the direction of the float's movement.

[0012] By adopting the above technical solution, after the float moves up and down inside the bottle stopper, the top of the float is compared with the scale, so that the amount of water in the thermos can be quickly and accurately determined.

[0013] Preferably, the end of the slide bar away from the bottle stopper is provided with a fixed seat, and the end of the rotating shaft away from the bottle stopper is rotatably disposed within the fixed seat.

[0014] By adopting the above technical solution, the fixed seat positions the slide rod and the rotating shaft, making it less likely for the slide rod and the rotating shaft to deflect, thus facilitating the float to drive the spiral plate to rotate.

[0015] Preferably, the bottle stopper includes a stopper body and a bottom cap, the bottom cap being detachably and fixedly disposed at the bottom of the stopper body; the sliding rod includes an upper rod body, a lower rod body, and multiple connecting rod bodies, the upper rod body being detachably and fixedly disposed at the bottom of the bottom cap, the multiple connecting rod bodies being sequentially and coaxially and detachably fixedly connected to the bottom of the upper rod body, and the lower rod body being detachably and fixedly connected to the bottom of the connecting rod body at the end away from the upper rod body, with the bottom end of the lower rod body inserted and fixedly disposed in a fixing seat; the rotating shaft includes an upper shaft body, a lower shaft body, and a connecting shaft, the shaft body sealingly penetrating the bottom cap and inserted and fixedly disposed at the bottom of the turntable, and the multiple connecting shaft bodies being sequentially and coaxially and detachably fixedly disposed in a fixed seat. The upper shaft is fixedly connected to the bottom of the upper shaft body, and the lower shaft body is detachably and fixedly connected to the bottom of the shaft body at the end away from the upper shaft body, and the bottom end of the lower shaft body is rotatably inserted into the fixed seat; the spiral plate includes a plurality of arc-shaped plates that are detachably and fixedly connected in sequence, one end of the arc-shaped plate body is provided with a connecting post, and the other end is provided with a connecting groove, the connecting post is inserted and fixed in the connecting groove, the side wall of the upper shaft body is fixedly provided with a mounting top plate below the bottom cover, the connecting groove is also opened on the bottom wall of the mounting top plate, and the arc-shaped plate body of the spiral plate near the bottom cover is fixedly inserted and fixed below the mounting top plate through the connecting post.

[0016] By adopting the above technical solution, when manufacturing the water level measuring device, the lengths of the slide rod, rotating shaft, and spiral plate can be adjusted by splicing different numbers of connecting rods, connecting shafts, and arc-shaped plates. The spiral plate is installed below the mounting top plate through connecting columns and connecting grooves. The turntable is connected to the rotating shaft on the bottom cover. The inclination of the spiral support platform on the turntable corresponds to the lengths of different shafts, so that when the float moves from the bottom to the top of the slide rod, the movement stroke of the float is fixed, thus making the water level measuring device suitable for thermos flasks of different depths.

[0017] Preferably, a positioning ring is rotatably provided on the outer wall of the lower shaft, a positioning base plate is fixedly provided on the side wall of the positioning ring, the connecting column is also provided on the positioning base plate, and the positioning base plate is fixedly provided below the arc-shaped plate near the fixed seat end of the spiral plate through the connecting column.

[0018] By adopting the above technical solution, when the spiral plate rotates, the spiral plate drives the positioning ring to rotate on the lower shaft through the positioning base plate. The positioning ring positions the rotation of the spiral plate, thereby making the rotation of the spiral plate more stable.

[0019] Preferably, the positioning base plate has a semi-circular cross-section near the bottom of the fixed seat, and a receiving ring is provided on the fixed seat on the outer periphery of the lower shaft. The receiving ring has a semi-circular cross-section, and the positioning base plate abuts against the receiving ring and makes point contact with the receiving ring.

[0020] By adopting the above technical solution, the receiving ring supports the spiral plate through the positioning base plate, making it less likely for the multiple arc-shaped plates inside the spiral plate to separate. At the same time, the positioning base plate makes point contact with the receiving ring, reducing the friction between the positioning base plate and the receiving ring, thus facilitating the rotation of the spiral plate.

[0021] Preferably, the limiting structure includes a guide slider disposed within the float, and a guide groove is provided on the outer wall of the slide rod along its own axis, and the guide slider is slidably disposed within the guide groove in accordance with the axis of the slide rod.

[0022] By adopting the above technical solution, when the float slides on the slide rod, the float drives the guide slider to slide in the guide groove of the slide rod. The guide slider and the guide groove cooperate to prevent the float from deflecting on the slide rod during the sliding process.

[0023] Preferably, the bottom end of the buoy's abutting spiral receiving platform is hemispherical.

[0024] By adopting the above technical solution, the bottom of the buoy hemisphere reduces the contact area between the buoy and the turntable, thereby facilitating the buoy's sliding on the spiral support platform.

[0025] Preferably, a limiting ring is provided at the bottom end of the outer wall of the buoy, and the limiting ring abuts against the bottle stopper located on the top wall of the accommodating cavity.

[0026] By adopting the above technical solution, the limiting ring limits the upward stroke of the buoy, thereby preventing the buoy from slipping out of the bottle stopper.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By using a float to drive the spiral plate to rotate, and the spiral plate in turn drives the rotating shaft to rotate, the liquid level display component displays the water level in the thermos according to the angle of rotation of the rotating shaft. This does not require damaging the body of the thermos and can also measure the water level in the thermos, thus making it easy to observe the water level in the thermos without affecting the heat preservation performance of the thermos.

[0029] 2. By using a turntable and a float, the rotating shaft drives the turntable inside the accommodating cavity to rotate, the turntable drives the spiral receiving platform to rotate, and the spiral receiving platform then drives the float to rise and fall inside the bottle stopper. Finally, the length of the float beyond the bottle stopper is used to quickly determine the amount of water in the thermos.

[0030] 3. By using the bottom of the buoy hemisphere, the contact area between the buoy and the turntable is reduced, which makes it easier for the buoy to slide on the spiral support platform. Attached Figure Description

[0031] Figure 1This is a schematic diagram of the overall structure of the water level measuring device for a thermos in Embodiment 1 of this application;

[0032] Figure 2 This application Figure 1 Enlarged view of point A in the middle;

[0033] Figure 3 This is a partial structural diagram of the water level measuring device for a thermos flask, used to highlight the liquid level display component.

[0034] Figure 4 This is a schematic diagram of the water level measuring device for a thermos in Embodiment 2 of this application;

[0035] Figure 5 This is a partial exploded view of the structure of the water level measuring device for a thermos in Embodiment 2 of this application;

[0036] Figure 6 This is a partial structural reverse explosion diagram of the water level measuring device for a thermos in Embodiment 2 of this application.

[0037] Explanation of reference numerals in the attached drawings: 1. Bottle stopper; 11. Stopper body; 12. Bottom cover; 2. Slide rod; 21. Upper rod body; 22. Lower rod body; 23. Connecting rod body; 3. Rotating shaft; 31. Upper shaft body; 32. Lower shaft body; 33. Connecting shaft body; 4. Float; 5. Limiting structure; 51. Guide slider; 6. Spiral plate; 61. Arc-shaped plate body; 7. Slot; 8. Liquid level display assembly; 81. Turntable; 82. Float; 9. Receiving cavity; 10. Spiral receiving platform; 13. Scale; 14. Fixing seat; 15. Guide slide groove; 16. Limiting ring; 17. Outer protrusion; 18. Clearance area; 19. Connecting column; 24. Connecting groove; 25. Positioning ring; 26. Positioning base plate; 27. Receiving ring; 28. Mounting top plate. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0039] This application discloses a water level measuring device for a thermos.

[0040] Example 1:

[0041] Reference Figure 1A water level measuring device for a thermos includes a stopper 1. A sliding rod 2 is fixedly installed along the axis of the bottom wall of the stopper 1. A fixing seat 14 is fixedly installed at the bottom end of the sliding rod 2 away from the stopper 1. A rotating shaft 3 is rotatably installed at the bottom of the stopper 1, parallel to the sliding rod 2, and the bottom end of the rotating shaft 3 is rotatably installed in the fixing seat 14. An external thread is formed on the outer side wall of the stopper 1. When the stopper 1 is threaded into the thermos, the stopper 1 drives the sliding rod 2 and the rotating shaft 3 to extend into the inner liner of the thermos, and the fixing seat 14 is located at the bottom of the inner liner.

[0042] Reference Figure 1 and 2 A float 4 is slidably mounted on the slide rod 2 along its own axis. The density of the float 4 is less than that of water. A limiting structure 5 is installed inside the float 4, and the limiting structure 5 includes a guide slider 51 integrally formed with the float 4. A guide groove 15 is formed on the outer wall of the slide rod 2 along its own axis, and the guide slider 51 is adapted to slide within the guide groove 15 along the axis of the slide rod 2. When the slide rod 2 is inserted into the inner liner of the thermos, the float 4 always floats on the water surface and slides on the slide rod 2. The guide slider 51 cooperates with the guide groove 15 to prevent the float 4 from deflecting when sliding.

[0043] Reference Figure 1 and 3 A spiral plate 6 is fixedly installed on the outer periphery of the rotating shaft 3. The spiral angle from the top to the bottom of the spiral plate 6 is 180°. A groove 7 is provided in the middle of the side wall of the float block 4 away from the slide rod 2, and the spiral plate 6 is slidably disposed in the groove 7. During the lifting and lowering of the float block 4, the spiral plate 6 is always located in the groove 7. The lifting and lowering of the float block 4 can drive the spiral plate 6 to rotate, and the spiral plate 6 in turn drives the rotating shaft 3 to rotate synchronously. The maximum rotation angle of the rotating shaft 3 is 180°.

[0044] The bottle stopper 1 has an internal cavity 9. A liquid level display component 8 is installed inside the cavity 9. Specifically, the liquid level display component 8 includes a turntable 81 and a float 82. The turntable 81 is rotatably installed inside the cavity 9 of the bottle stopper 1, and the bottom center of the turntable 81 is fixedly connected to the top of the rotating shaft 3. A spiral support platform 10 is formed on the top wall of the turntable 81, and the height of the spiral support platform 10 gradually increases along the axis of the turntable 81. The float 82 slides through the bottle stopper 1 along the axis of the slide rod 2. The bottom of the float 82 is located inside the cavity 9, and the bottom end of the float 82 abuts against the top wall of the spiral support platform 10. The top end of the float 82 is located outside the bottle stopper 1.

[0045] The float 4 drives the rotating shaft 3 to rotate via the spiral plate 6. The rotating shaft 3 drives the turntable 81 to rotate synchronously, and the turntable 81 drives the spiral receiving platform 10 to rotate synchronously. This causes a change in the height of the contact point between the spiral receiving platform 10 and the float 82, which in turn causes the float 82 to rise and fall within the bottle stopper 1. Finally, the length of the float 82 extending beyond the bottle stopper 1 is used to quickly determine the water level in the thermos. In this way, the water level in the thermos can be measured without damaging the body of the thermos, making it easy to observe the water level without affecting the thermos's heat preservation performance.

[0046] The top center of the bottle stopper 1 has an upwardly protruding portion 17. The protruding portion 17 is recessed inward along the diameter direction of the bottle stopper 1 near the side wall of the float 82 to form a clearance area 18. A scale 13 is engraved on the inner side wall of the clearance area 18 along the sliding direction of the float 82, and the top of the float 82 is located within the clearance area 18. In this application, the scale 13 is composed of "E", "1 / 2" and "F" from bottom to top.

[0047] When the inner liner of the thermos is empty, float 4 is at the bottom of slide bar 2, and the screw rod does not rotate. At this time, the bottom of float 82 abuts against the side of the screw support platform 10 with the lower height, and the top of float 82 is flush with 'E'. When the inner liner of the thermos is half full of water, float 4 slides to the middle of slide bar 2, and float 4 drives the screw rod to rotate 90°. The screw rod drives the screw support platform 10 to rotate 90° through the rotating shaft 3 and the turntable 81. At this time, float 82... The bottom of float 82 rests against the center of the spiral support platform 10, and the top of float 82 is flush with '1 / 2'. When the inner liner of the thermos is full of water, float 4 slides to the top of slide rod 2, and float 4 drives the spiral rod to rotate 180°. The spiral rod drives the spiral support platform 10 to rotate 180° through the rotating shaft 3 and the turntable 81. At this time, the bottom of float 82 rests against the higher side of the spiral support platform 10, and the top of float 82 is flush with 'F'. Using a scale 13 in conjunction with float 82 allows the user to clearly and quickly observe the remaining water level in the thermos.

[0048] The bottom of the buoy 82 is hemispherical. The bottom of the hemispherical buoy 82 abuts against the top wall of the spiral support platform 10, which reduces the contact area between the buoy 82 and the spiral support platform 10. When the spiral support platform 10 rotates, the friction between the buoy 82 and the spiral support platform 10 is smaller, which makes it easier for the buoy 82 to slide on the spiral support platform 10.

[0049] Meanwhile, a limiting ring 16 is integrally formed on the outer wall of the buoy 82 near the hemisphere, and the limiting ring 16 abuts against the top wall of the bottle stopper 1 located in the accommodating cavity 9. When the thermos is in an inverted state, the buoy 82 slides outward from the bottle stopper 1 under the action of gravity, and the buoy 82 drives the limiting ring 16 to move. When the limiting ring 16 moves and abuts against the top wall of the accommodating cavity 9 of the bottle stopper 1, the limiting ring 16 limits the buoy 82, so that the buoy 82 will not slip out of the bottle stopper 1.

[0050] The implementation principle of Embodiment 1 of this application is as follows: When the stopper 1 is installed inside the thermos, the stopper 1 drives the sliding rod 2 and the rotating shaft 3 to extend into the inner liner of the thermos. The float 4 always floats on the water surface and slides on the sliding rod 2. The sliding of the float 4 drives the rotating shaft 3 to rotate through the spiral plate 6. The rotating shaft 3 drives the spiral receiving platform 10 to rotate synchronously through the turntable 81, so that the height of the spiral receiving platform 10 and the float 82 abutting each other changes, thereby causing the float 82 to rise and fall inside the stopper 1. Finally, by comparing the length of the float 82 extending beyond the stopper 1 with the scale 13, the water level in the thermos can be quickly determined. In this way, the water level in the thermos can be measured without damaging the body of the thermos, thus facilitating the observation of the water level in the thermos without affecting the thermos's heat preservation performance.

[0051] Example 2:

[0052] Reference Figure 4 and 5 The difference between this embodiment and embodiment 1 is that the lengths of the slide bar 2, the rotating shaft 3 and the spiral plate 6 are all adjustable. The bottle stopper 1 includes a stopper body 11 and a bottom cover 12. The bottom end of the stopper body 11 is open. The bottom cover 12 is circular and threadedly detachably fixed to the bottom opening end of the stopper body 11.

[0053] The slide bar 2 includes an upper rod 21, a lower rod 22, and multiple connecting rods 23. The top end of the upper rod 21 is threadedly fixed to the middle of the bottom wall of the bottom cover 12. One end of each connecting rod 23 has a threaded post, and the other end has a threaded groove. Multiple connecting rods 23 are coaxially and fixedly connected through the threaded post and the threaded groove. The threaded groove is also formed at the bottom end of the upper rod 21, and the threaded post is also formed at the top end of the lower rod 22, so that the upper rod 21 and the lower rod 22 can be installed at both ends of multiple connected connecting rods 23. In this way, by connecting different numbers of connecting rods 23, the length of the slide bar 2 can be adjusted, and the bottom end of the lower rod 22 is inserted and fixed in the fixed seat 14.

[0054] The rotating shaft 3 includes an upper shaft body 31, a lower shaft body 32, and multiple connecting shaft bodies 33. The top end of the upper shaft body 31 is sealed through the bottom cover 12 and inserted and fixed to the middle of the bottom wall of the turntable 81. One end of each connecting shaft body 33 has a threaded post, and the other end has a threaded groove. Multiple connecting shaft bodies 33 are coaxially and fixedly connected through the threaded post and the threaded groove. The threaded groove is also formed at the bottom end of the upper shaft body 31, and the threaded post is also formed at the top end of the lower shaft body 32, so that the upper shaft body 31 and the lower shaft body 32 can be installed at both ends of multiple connected connecting shaft bodies 33. In this way, by connecting different numbers of connecting shaft bodies 33, the length of the rotating shaft 3 can be adjusted, and the bottom end of the lower shaft body 32 is rotatably inserted into the fixed seat 14.

[0055] Reference Figure 5 and 6 The spiral plate 6 comprises multiple arc-shaped plates 61. Two connecting posts 19 are integrally formed at one end of each arc-shaped plate 61 along its length, and two connecting slots 24 are formed at the other end. The two connecting posts 19 of one arc-shaped plate 61 are fitted into the two connecting slots 24 of another connecting post 19, thus connecting two arc-shaped plates 61. By using different numbers of arc-shaped plates 61, the length of the spiral plate 6 can be adjusted, and the spiral angle from the top to the bottom of the spiral plate 6 does not exceed 360°. Simultaneously, a mounting top plate 28 is fixedly installed on the outer wall of the upper shaft 31 along its diameter direction below the cover plate. Two connection points are also formed on the bottom wall of the mounting top plate 28, allowing the assembled spiral plate 6 to be fixedly connected to the rotating shaft 3.

[0056] The connecting rod 23, connecting shaft 33, and arc-shaped plate 61 are of the same length. By connecting different numbers of connecting rods 23, connecting shafts 33, and arc-shaped plates 61, slide rods 2, rotating shafts 3, and threaded plates of different lengths can be assembled. After adjustment, the corresponding turntable 81 is installed on the bottom cover 12 and connected to the upper shaft 31. The inclination of the spiral support platform 10 on the corresponding turntable 81 varies, so that when the float 4 moves from the bottom to the top of the slide rod 2, the travel distance of the float 82 is fixed. In this way, water level measuring devices of different lengths can be assembled, making the water level measuring device suitable for thermos flasks of different depths.

[0057] A positioning ring 25 is rotatably mounted on the outer wall of the lower shaft 32. A positioning base plate 26 is fixedly mounted on the side wall of the positioning ring 25 along the diameter direction of the lower shaft 32. Two connecting columns 19 are also fixedly mounted on the top wall of the positioning base plate 26. After the rotating shaft 3 is assembled, the positioning ring 25 is fitted onto the lower shaft 32, and the positioning base plate 26 is installed at the bottom of the spiral plate 6 through the connecting columns 19. When the spiral plate 6 rotates, the positioning base plate 26 drives the positioning ring 25 to rotate on the lower shaft 32. The positioning ring 25 positions the rotation of the spiral plate 6, thereby making the rotation of the spiral plate 6 more stable.

[0058] Two support rings 27 are integrally formed on the top of the fixed base 14. The two support rings 27 are coaxially spaced on the outside of the rotating shaft 3, and the positioning base plate 26 abuts against the two support rings 27. The support rings 27 support the spiral plate 6 through the positioning base plate 26, so that the spiral plate 6 composed of multiple arc-shaped plates 61 is not easy to disintegrate.

[0059] The receiving ring 27 has a semi-circular cross-section with its arc surface facing upwards. The bottom of the positioning base plate 26 also has a semi-circular cross-section with its arc surface facing downwards. The receiving ring 27 and the bottom of the positioning base plate 26 are in point contact. This point contact between the positioning base plate 26 and the receiving ring 27 reduces the friction between them, thus facilitating the rotation of the spiral plate 6.

[0060] Two limiting rings 16 are installed, located at both ends of the outer wall of the buoy 82 along its axis. The two limiting rings 16 limit the position of the buoy 82, preventing the buoy 82 from slipping out of the plug body 11 during the assembly of the plug body 11 and the bottom cover 12.

[0061] The implementation principle of Embodiment 2 of this application is as follows: the connecting rod 23, the connecting shaft 33, and the arc-shaped plate 61 are of the same length. By connecting different numbers of connecting rods 23, connecting shafts 33, and arc-shaped plates 61, sliding rods 2, rotating shafts 3, and threaded plates of different lengths can be assembled. In this way, water level measuring devices of different lengths can be assembled, thereby making the water level measuring device applicable to thermos flasks of different depths.

[0062] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A water level measuring device for an insulated jug, characterised in that: The device includes a bottle stopper (1), a slide rod (2) on the bottle stopper (1), a rotating shaft (3) rotatably mounted on the bottle stopper (1), both the slide rod (2) and the rotating shaft (3) extending into the inner liner of the thermos, a float (4) slidably mounted on the slide rod (2) along the height direction of the inner liner, and a limiting structure (5) for preventing the float (4) from deflecting at the connection between the slide rod (2) and the float (4); a spiral plate (6) is mounted on the periphery of the rotating shaft (3), a slot (7) is opened in the float (4), and the spiral plate (6) is slidably mounted in the slot (7); a liquid level display component (8) connected to the rotating shaft (3) is mounted inside the bottle stopper (1), and the liquid level display component (8) converts the rotation angle of the rotating shaft (3) into a liquid level indication; The bottle stopper (1) has a receiving cavity (9). The liquid level display component (8) includes a turntable (81) rotatably disposed in the receiving cavity (9) and a float (82) sliding through the bottle stopper (1). The center of the turntable (81) is fixedly connected to the rotating shaft (3). The top wall of the turntable (81) gradually tilts upward along its circumference to form a spiral receiving platform (10). The bottom end of the float (82) slides against the spiral receiving platform (10), and the top end of the float (82) protrudes through the bottle stopper (1).

2. The water level measuring device for a thermos flask according to claim 1, characterized in that: A scale (13) is provided on the top side wall of the bottle stopper (1) along the moving direction of the buoy (82).

3. The water level measuring device for a thermos flask according to claim 1, characterized in that: The end of the slide bar (2) away from the bottle stopper (1) is provided with a fixed seat (14), and the end of the rotating shaft (3) away from the bottle stopper (1) is rotatably disposed in the fixed seat (14).

4. A water level measuring device for a thermos flask according to claim 3, characterized in that: The bottle stopper (1) includes a stopper body (11) and a bottom cover (12). The bottom cover (12) is detachably and fixedly disposed at the bottom of the stopper body (11). The sliding rod (2) includes an upper rod body (21), a lower rod body (22), and multiple connecting rod bodies (23). The upper rod body (21) is detachably and fixedly disposed at the bottom of the bottom cover (12). Multiple connecting rod bodies (23) are sequentially and coaxially and detachably fixedly connected to the bottom of the upper rod body (21). The lower rod body (22) is detachably and fixedly connected to the bottom of the connecting rod body (23) at the end away from the upper rod body (21), and the bottom end of the lower rod body (22) is inserted and fixedly disposed in the fixed seat (14). The rotating shaft (3) includes an upper shaft body (31), a lower shaft body (32), and a connecting shaft body (33). The shaft body seals through the bottom cover (12) and is inserted and fixedly disposed at the bottom of the turntable (81). Multiple connecting shaft bodies (33) are sequentially and coaxially and detachably disposed. The lower shaft (32) is detachably and fixedly connected to the bottom of the upper shaft (31) and the lower shaft (32) is detachably and fixedly connected to the bottom of the shaft (33) at the end away from the upper shaft (31), and the bottom end of the lower shaft (32) is rotatably inserted into the fixed seat (14); the spiral plate (6) includes a plurality of arc-shaped plates (61) that are detachably and fixedly connected in sequence. One end of the arc-shaped plate (61) in the connecting direction is provided with a connecting post (19), and the other end is provided with a connecting groove (24). The connecting post (19) is inserted and fixed in the connecting groove (24). The upper shaft (31) is fixedly provided with a mounting top plate (28) at the side wall below the bottom cover (12). The connecting groove (24) is also opened on the bottom wall of the mounting top plate (28), and the arc-shaped plate (61) of the spiral plate (6) near the bottom cover (12) is inserted and fixed below the mounting top plate (28) through the connecting post (19).

5. A water level measuring device for a thermos flask according to claim 4, characterized in that: A positioning ring (25) is rotatably provided on the outer wall of the lower shaft (32), and a positioning base plate (26) is fixedly provided on the side wall of the positioning ring (25). The connecting column (19) is also provided on the positioning base plate (26), and the positioning base plate (26) is fixedly provided below the arc-shaped plate (61) of the spiral plate (6) near the fixed seat (14) through the connecting column (19).

6. A water level measuring device for a thermos flask according to claim 5, characterized in that: The positioning base plate (26) has a semi-circular cross-section near the bottom end of the fixed seat (14). A receiving ring (27) is provided on the outer periphery of the lower shaft (32) on the fixed seat (14). The receiving ring (27) has a semi-circular cross-section. The positioning base plate (26) abuts against the receiving ring (27) and makes point contact with the receiving ring (27).

7. A water level measuring device for a thermos flask according to claim 1, characterized in that: The limiting structure (5) includes a guide slider (51) disposed in the float (4). A guide groove (15) is provided on the outer wall of the slide rod (2) along its own axis. The guide slider (51) is adapted to slide in the guide groove (15) along the axis of the slide rod (2).

8. A water level measuring device for a thermos flask according to claim 1, characterized in that: The bottom end of the abutting spiral support platform (10) of the buoy (82) is hemispherical.

9. A water level measuring device for a thermos flask according to claim 1, characterized in that: A limiting ring (16) is provided at the bottom of the outer wall of the buoy (82), and the limiting ring (16) abuts against the bottle stopper (1) located on the top wall of the accommodating cavity (9).

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