A fuel level sensor

Abstract

The invention relates to the field of sensor technology, and in particular to a fuel level sensor. The fuel level sensor comprises a fixing seat, an electron tube is arranged on the fixing seat, a float is sleeved on the electron tube, the float can slide along the axis direction of the electron tube, a plurality of clamping rollers and a plurality of annular dampers are inserted in the float, and the clamping roller can rotate around its own axis; the plurality of clamping rollers are arranged along the circumferential direction to be clamped on the electron tube together; the annular damper is connected between the float and the clamping roller, and is configured to hinder the rotation of the clamping roller around its own axis; the clamping roller is configured to have a first state according to the vibration amplitude of the fuel, and in the first state, the axis of the clamping roller is perpendicular to the axis of the electron tube, and then when the vehicle travels on a road section with poor road conditions, the vibration of the fuel in the fuel tank synchronously drives the float to move upward, and the clamping roller rotates at the same time, at this time, the clamping roller will lag in rotation due to the obstruction of the annular damper, so that the float lags in movement, thereby ensuring that the sensor output is more stable and accurate.

Description

Technical Field

[0001] The invention relates to the technical field of sensors, and in particular to a fuel level sensor. Background Art

[0002] A fuel level sensor is a device used to detect the fuel level in a container. Its main function is to ensure the normal and safe operation of the equipment by measuring the fuel level. It is widely used in automobiles, ships, aircraft and other industrial fields.

[0003] Existing fuel level sensors can be divided into fiber optic fuel level sensors, capacitive fuel level sensors and resistive fuel level sensors according to their working principles. Among them, the resistive fuel level sensor is a resistance-based oil level sensor that is mechanically connected to a float. As the fuel level rises or falls, the movement of the float causes the sensor resistance to change. This type of sensor is more common in automobiles.

[0004] In the related technology, for example, Chinese patent CN115655421B discloses a resistance sensor capable of improving sampling accuracy. The resistance sensor capable of improving sampling accuracy drives the unwinder to descend to a specified position through a micro electric push rod driving the mobile frame, the motor inside the unwinder drives the cable reel to rotate for unwinding, the cleaning mechanism descends from the inner cavity of the storage shell to the bottom under the action of gravity, the micro double-end motor drives the universal couplings at the corresponding positions on both sides to rotate, and drives the rotating seat to rotate under the transmission of the universal coupling, thereby causing the rotating seat to drive one end of the connecting rod to move circumferentially, and the connecting rod drives the mounting seat to rotate with the rotating rod pin. The apex moves upward, and the mounting seat squeezes the inner wall of the spring sheet while driving the annular sheet to move inward. The upper and lower annular sheets move inward and move along the inclined surface of the rotating sheet at the corresponding position to drive the rotating sheet to rotate inward with the hinge position of the through-hole groove as the apex, and the rotating sheet pushes the scraper to move inward with the cooperation of the limit spring to contact the outer wall of the liquid level rod. The unwinder reels the cleaning mechanism to move upward along the outer wall of the liquid level rod, and scrapes off the oil on the outer wall of the liquid level rod with the cooperation of the scraper, thereby realizing automatic cleaning of oil attached to the surface of the liquid level rod of the resistive oil tank level sensor after long-term use, thereby improving the measurement accuracy of the oil tank level.

[0005] Although the above-mentioned resistance sensor that can improve sampling accuracy can scrape off the oil stains adhered to the outer wall of the liquid level rod in time, it is found in actual use that when the vehicle is traveling on a road with general road conditions, the fuel in the fuel tank will vibrate, causing the float to float up and down, and then the resistance value output by the sensor will change continuously, causing the fuel level detection data to fluctuate, and it is impossible to accurately reflect the actual fuel level, affecting the judgment of the fuel amount. Summary of the invention

[0006] Based on this, it is necessary to provide a fuel level sensor to address the problems of low detection accuracy and large data errors in the current fuel level detection process.

[0007] The above purpose is achieved through the following technical solutions:

[0008] A fuel level sensor, the fuel level sensor comprising a fixing seat, an electron tube being arranged on the fixing seat, a float being sleeved on the electron tube, the float being able to slide along the axis direction of the electron tube, a clamping roller and a plurality of annular dampers being inserted in the float, the clamping roller being able to rotate around its own axis; there are a plurality of clamping rollers, the plurality of clamping rollers being arranged along the circumferential direction to be clamped on the electron tube together; the annular damper being connected between the float and the clamping roller, and being configured to hinder the rotation of the clamping roller around its own axis; the clamping roller being configured to have a first state according to the vibration amplitude of the fuel, and in the first state, the axis of the clamping roller is perpendicular to the axis of the electron tube.

[0009] Further, the clamping roller is capable of rotating around a first axis, and the first axis extends in a radial direction of the electron tube; the clamping roller is further configured to have a second state and a third state according to the vibration amplitude of the fuel, and when in the second state, there is an acute angle between the axis of the clamping roller and the axis of the electron tube, and the size of the acute angle is negatively correlated with the vibration amplitude of the fuel; when in the third state, the axis of the clamping roller is parallel to the axis of the electron tube; the fuel level sensor also includes a switching mechanism, and the switching mechanism is configured to be able to switch the state of the clamping roller between the first state, the second state and the third state.

[0010] Further, the switching mechanism comprises a floating ring and a plurality of pairs of switching components, wherein the floating ring is sleeved on the electron tube and can slide relative to the float along the axis direction of the electron tube; the two switching components of the same pair are arranged corresponding to the same clamping roller and are symmetrically arranged between the float and the floating ring; the switching component comprises a first adjustment frame, a second adjustment frame, a slider, a one-way damper, a telescopic plate and a transmission part, wherein the first ends of the first adjustment frame and the second adjustment frame are both inserted and slidably mounted on the floating ring along the circumferential direction, and the second ends are both inserted and slidably mounted on the float along the axis direction of the electron tube; the slider is arranged on the float and can slide elastically along the radial direction of the electron tube; the one-way damper is fixedly arranged on the float, and the output end is arranged on the slider, and is configured to prevent the slider from moving in a direction away from the electron tube; one end of the telescopic plate is hinged on the first adjustment frame, and the other end is hinged on the second adjustment frame, and can form a sliding fit with the slider; the transmission part is configured to convert the movement of the slider into the rotation of the clamping roller around the first axis.

[0011] Furthermore, the transmission part includes an inclined groove, a gear and a rack, the inclined groove is arranged on the slider; the gear is arranged on the clamping roller; the rack is inserted on the float and extends along the axial direction of the electron tube, the top end of the rack is slidably inserted in the inclined groove, and the bottom end is meshed with the gear.

[0012] Furthermore, the fuel level sensor also includes a first adjustment mechanism, which is configured to adjust the inclination angle of the telescopic plate according to the height of the liquid level of the float, so that when the liquid level of the float is higher, the inclination angle of the telescopic plate is adjusted to be larger and closer to vertical.

[0013] Further, the first adjustment mechanism includes two sliding rings, a plurality of wedge blocks and a plurality of wedge rods, the two sliding rings are coaxially arranged on the floating ring, and both can slide along the axial direction of the floating ring; the wedge blocks are correspondingly arranged to the two switching assemblies of the same pair, and can slide along the radial direction of the floating ring, and simultaneously form a guiding fit with the two sliding rings; the wedge rods are correspondingly arranged to the wedge blocks, and are fixedly arranged on the fixing seat, the wedge rods extend along the axial direction of the electron tube, and form a guiding fit with the wedge blocks.

[0014] Furthermore, the fuel level sensor also includes a second adjustment mechanism, which is configured to adjust the acute angle to be negatively correlated with the vibration amplitude of the fuel when the vibration amplitude of the fuel is less than a preset amplitude; and to adjust the acute angle to be equal to zero when the vibration amplitude of the fuel is greater than a preset amplitude.

[0015] Furthermore, the second adjustment mechanism includes multiple pairs of slide grooves and multiple pairs of elastic protrusions, the slide grooves are arranged on the float and extend in a direction perpendicular to the axis of the electron tube; the two slide grooves of the same pair are correspondingly arranged on the same slider; the two elastic protrusions of the same pair are arranged on the same slider and are respectively slidably inserted into the two slide grooves of the same pair.

[0016] Furthermore, the friction coefficient of the middle portion of the clamping roller is smaller than the friction coefficient of the two ends.

[0017] Furthermore, the clamping roller is elastically clamped on the electron tube.

[0018] The beneficial effects of the present invention are:

[0019] During use of the fuel level sensor provided by the present invention, when the vibration amplitude of the fuel is small, the fuel synchronously drives the float to move up and down, and the clamping roller rotates at the same time. At this time, under the damping action of the annular damper, the clamping roller will have a delayed rotation, thereby causing the float to move with a lag. On the one hand, this can make the output signal of the fuel level sensor more stable, which helps to improve the accuracy of the oil quantity information. On the other hand, it can reduce the frequent up and down movement of the float caused by the fuel impact, which helps to reduce the mechanical wear of the float and the electron tube, and is conducive to extending the service life of the fuel level sensor.

[0020] Furthermore, a switching mechanism is provided so that during use, when the vibration amplitude of the fuel is moderate, the clamping roller is switched to the second state through the switching mechanism, at which time there is an acute angle between the axis of the clamping roller and the axis of the electron tube, and the size of the acute angle is negatively correlated with the vibration amplitude of the fuel. At this time, the fuel drives the float to move up and down. Since the clamping roller is inclined, the float moves along a spiral path at the same time under the drive of the clamping roller, thereby, on the one hand, avoiding the liquid level error caused by the large axial movement of the float, and on the other hand, when the clamping roller moves, it can also clean the oil stains adhered to the electron tube in the circumferential and axial directions at the same time, which is beneficial to improve the measurement accuracy of the fuel level; when the vibration amplitude of the fuel is large, the clamping roller is switched to the third state through the switching mechanism, at which time the axis of the clamping roller is parallel to the axis of the electron tube, and the float rotates at the same time under the impact of the fuel, which, on the one hand, can lock the height of the float in the axial direction to avoid signal instability and mechanical wear caused by frequent movement, and on the other hand, can consume the impact energy of the fuel on the float to prevent slipping.

[0021] Furthermore, by setting a first adjustment mechanism, during use, when the liquid level at which the float is located is higher, the inclination angle of the telescopic plate is adjusted to be larger and closer to vertical, so that the distance that the telescopic plate can drive the slider to move in the radial direction of the electron tube when the telescopic plate moves upward by a unit distance is smaller, thereby making the number of turns of the clamping roller around the first axis smaller, thereby reducing the rate at which the clamping roller state switches; when the liquid level at which the float is located is lower, the inclination angle of the telescopic plate is adjusted to be smaller and closer to horizontal, so that the distance that the telescopic plate can drive the slider to move in the radial direction of the electron tube when the telescopic plate moves upward by a unit distance is larger, thereby making the number of turns of the clamping roller around the first axis greater, thereby increasing the rate at which the clamping roller state switches, thereby being able to adjust the clamping roller state to have a suitable rate according to different fuel levels, thereby further improving the accuracy of fuel level detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the three-dimensional structure of a fuel level sensor provided in an embodiment of the present invention;

[0023] Figure 2A schematic diagram of the front view of the fuel level sensor provided by an embodiment of the present invention;

[0024] Figure 3 for Figure 2 Middle AA section view;

[0025] Figure 4 for Figure 2 Middle BB section view;

[0026] Figure 5 for Figure 4 A schematic diagram of the partially enlarged structure at C in the middle;

[0027] Figure 6 A schematic diagram of a three-dimensional cross-sectional structure of a floating ring, a sliding ring and a wedge block of a fuel level sensor provided by an embodiment of the present invention when assembled;

[0028] Figure 7 A schematic diagram of the three-dimensional structure of the switch assembly and the elastic protrusion of the fuel level sensor provided by the embodiment of the present invention when assembled;

[0029] Figure 8 A schematic diagram of a three-dimensional cross-sectional structure of a clamping roller, a mounting frame, a mounting ring, a second compression spring, a torsion spring and an annular damper of a fuel level sensor provided by an embodiment of the present invention when assembled;

[0030] Fig. 9 A schematic diagram of the three-dimensional structure of the assembly of the clamping roller and the sleeve ring of the fuel level sensor provided by the embodiment of the present invention;

[0031] Fig.10 A schematic diagram of the three-dimensional structure of a float of a fuel level sensor provided in an embodiment of the present invention;

[0032] Fig.11 for Fig.10 The schematic diagram of the local enlarged structure at D in the middle;

[0033] Fig.12 A schematic cross-sectional view of a float of a fuel level sensor provided in an embodiment of the present invention;

[0034] Fig.13 A working principle diagram of the clamping roller of the fuel level sensor provided by the embodiment of the present invention when it is in the second state;

[0035] Fig.14 A diagram showing the working principle of the clamping roller of the fuel level sensor provided in an embodiment of the present invention when it is in the third state.

[0036] in:

[0037] 1. Fixed seat; 11. Sliding rod;

[0038] 2. Electron tube;

[0039] 3. Float; 301. First vertical groove; 302. Second vertical groove; 303. Horizontal groove; 31. Vertical rail; 311. Third vertical groove; 32. Fixed ring;

[0040] 4. Clamping roller; 41. Mounting frame; 42. Mounting ring; 43. Second compression spring; 44. Torsion spring;

[0041] 51, liquid chamber; 52, baffle; 53, collar; 531, push block; 532, damping hole;

[0042] 61, floating ring; 611, first ring groove; 612, fixing rod; 621, first adjustment frame; 622, second adjustment frame; 623, slider; 624, one-way damper; 6241, third compression spring; 625, telescopic plate; 6251, first comb tooth dividing plate; 6252, second comb tooth dividing plate; 6261, inclined groove; 6262, gear; 6263, rack;

[0043] 7. first adjustment mechanism; 71. sliding ring; 711. second ring groove; 712. wedge-shaped annular surface; 72. wedge-shaped block; 73. wedge-shaped rod;

[0044] 81. Slide groove; 82. Elastic protrusion. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned herein, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] like Figures 1 to 14 As shown, the fuel level sensor provided by the embodiment of the present invention is used to detect the fuel level, and is configured to include a fixing seat 1, on which an electron tube 2 is arranged, and a float 3 is sleeved on the electron tube 2, and the float 3 can slide along the axial direction of the electron tube 2, and a clamping roller 4 and a plurality of annular dampers are inserted in the float 3, and the clamping roller 4 can rotate around its own axis; there are multiple clamping rollers 4, and the multiple clamping rollers 4 are arranged along the circumferential direction to be clamped on the electron tube 2 together; the annular damper is connected between the float 3 and the clamping roller 4, and is configured to hinder the rotation of the clamping roller 4 around its own axis; the clamping roller 4 is configured to have a first state according to the vibration amplitude of the fuel, and when in the first state, the axis of the clamping roller 4 is perpendicular to the axis of the electron tube 2.

[0049] Specifically in this embodiment, Figure 1 As shown, the fixing base 1 is configured as a columnar frame structure; the electron tube 2 is coaxially inserted into the fixing base 1 during installation; Fig.10 and Fig.12 As shown, the float 3 is configured as an annular shell structure, such as Figure 1 As shown, the float 3 is coaxially sleeved on the electron tube 2 during installation and inserted into the fixing seat 1 .

[0050] like Figure 3 As shown, the clamping roller 4 is configured as a roller-shaped structure, and a mounting shaft is fixedly arranged on both end surfaces of the clamping roller 4. The mounting shaft and the clamping roller 4 are coaxially arranged. The number of the clamping rollers 4 can be four and evenly arranged along the circumferential direction. In order to facilitate the installation of the clamping roller 4 on the float 3, the fuel level sensor is configured to further include four mounting frames 41, four mounting rings 42 and four fixing rings 32. Taking a set of mounting frames 41, mounting rings 42, fixing rings 32 and clamping rollers 4 as an example, as shown in FIG. Figure 8As shown, the mounting frame 41 is configured to consist of a first part and a second part, wherein the first part is configured to be a strip-shaped structure and a notch is provided on the first part, and the second part is configured to be a columnar structure, the second part is vertically mounted on the first part and is arranged opposite to the notch on the first part; the clamping roller 4 is inserted into the notch of the first part by rotating the mounting shaft during installation, so that the clamping roller 4 can rotate around its own axis; the mounting ring 42 is configured to be a "cross"-shaped rotating body structure and is sleeved on the first part during installation; as shown Fig.12 As shown, the fixing ring 32 is arranged on the inner peripheral wall of the float 3 during installation, and the axis of the fixing ring 32 extends along the radial direction of the float 3; Figure 5 As shown, the mounting ring 42 is coaxially inserted into the fixing ring 32 during installation, so that the clamping rollers 4 can be suspended in the air and arranged toward the electron tube 2, so that the four clamping rollers 4 can clamp the electron tube 2 together.

[0051] There are eight annular dampers, which are divided into four groups. Each group includes two annular dampers. The two annular dampers in the same group are corresponding to the same clamping roller 4. The annular damper is configured to include a liquid chamber 51, a baffle 52 and a collar 53. Figure 8 As shown, the liquid chamber 51 is arranged on the suspended end of the first part of the mounting frame 41, and is arranged in a cylindrical groove structure, and is arranged coaxially with the clamping roller 4. The liquid chamber 51 is filled with damping liquid when in use. The liquid chambers 51 of the two annular dampers in the same group are respectively arranged on the two suspended ends of the first part of the same mounting frame 41; the baffle 52 is inserted into the liquid chamber 51, and the baffle 52 and the axis of the clamping roller 4 are arranged in parallel, and the baffle 52 can slide elastically along the axis direction of the clamping roller 4; the number of baffles 52 is eight, and they are evenly divided into four groups, each group includes two baffles 52, and the four groups of baffles 52 are evenly arranged along the circumferential direction, and the two baffles 52 in the same group are arranged along the axis direction of the clamping roller 4, and are sealed and abutted under the action of elasticity, so as to divide the liquid chamber 51 into four independent sub-chambers along the circumferential direction; as shown Fig. 9 As shown, the collar 53 is fixedly sleeved on the end of the clamping roller 4 during installation, and is coaxially inserted into the liquid chamber 51. A push block 531 is fixedly arranged on the outer peripheral wall of the collar 53. The push block 531 is arranged in a hexagonal pyramid structure, and the small end faces the collar 53. The two opposite side wall surfaces of the push block 531 are respectively arranged to coincide with the two end surfaces of the collar 53. Damping holes 532 are arranged on the side wall surfaces of the push block 531 and the collar 53 located in the same circumferential direction. The push block 531 is inserted into the sub-chamber during installation, and the sub-chamber is divided into two sub-chambers, so that the damping liquid can only be exchanged in the two sub-chambers of the same sub-chamber through the damping hole 532, thereby achieving a damping effect.

[0052] In order to facilitate the elastic sliding of the baffle 52 along the axial direction of the clamping roller 4, the fuel level sensor is configured to also include eight mounting grooves and eight first compression springs. The mounting grooves extend along the axial direction of the liquid chamber 51. The eight mounting grooves are grouped in pairs to form four groups in total. The two mounting grooves in the same group are respectively arranged on the two end faces of the liquid chamber 51, and the mounting grooves in different groups are evenly arranged along the circumferential direction; the first compression spring is inserted into the mounting groove during installation and extends along the axial direction of the liquid chamber 51; the baffle 52 is slidably inserted into the mounting groove during installation and is fixedly connected to the first compression spring. Under the push of the first compression spring, the two baffles 52 in the same group tend to extend out of the mounting groove, thereby achieving sealing abutment.

[0053] like Figure 3 As shown, when the clamping roller 4 is in the first state, the axis of the clamping roller 4 and the axis of the electron tube 2 are arranged perpendicularly.

[0054] During use, when the vibration amplitude of the fuel is small, the fuel level will change, thereby driving the float 3 to move up and down, and the movement of the float 3 needs to be achieved by the rolling of the clamping roller 4 on the electron tube 2, and the rolling of the clamping roller 4 needs to be achieved by rotating around its own axis; when the clamping roller 4 rotates around its own axis, the clamping roller 4 synchronously drives the ring 53 and the push block 531 to rotate; during the revolution of the push block 531, since the push block 531 is inserted in the sub-chamber and the sub-chamber is divided into two sub-chambers, the damping fluid can only be exchanged in the two sub-chambers of the sub-chamber through the damping hole 532 to produce a damping effect on the rotation of the push block 531. Under the damping effect, the clamping roller 4 will lag in rotation, thereby causing the float 3 to lag in movement, so that on the one hand, the output signal of the fuel level sensor can be made more stable, which is helpful to improve the accuracy of the oil quantity information, and on the other hand, the frequent up and down movement of the float 3 caused by the fuel impact can be reduced, which helps to reduce the mechanical wear of the float 3 and the electron tube 2 and prolong the service life of the fuel level sensor.

[0055] In some embodiments, in order to further improve the accuracy of fuel level detection, the clamping roller 4 is configured to be able to rotate around a first axis, and the first axis extends in the radial direction of the electron tube 2; the clamping roller 4 is also configured to have a second state and a third state according to the vibration amplitude of the fuel, and when in the second state, there is an acute angle between the axis of the clamping roller 4 and the axis of the electron tube 2, and the size of the acute angle is negatively correlated with the vibration amplitude of the fuel; when in the third state, the axis of the clamping roller 4 is parallel to the axis of the electron tube 2; the fuel level sensor is configured to also include a switching mechanism, and the switching mechanism is configured to be able to switch the state of the clamping roller 4 between the first state, the second state and the third state.

[0056] Specifically in this embodiment, the mounting ring 42 can be inserted into the fixing ring 32 to rotate when installed, and the first axis coincides with the axis of the mounting ring 42; Figure 8As shown, a torsion spring 44 is inserted into the end of the mounting ring 42 away from the mounting frame 41, and the torsion spring 44 is connected between the mounting ring 42 and the fixing ring 32; Fig.13 As shown, the clamping roller 4 is in the second state, at which time there is an acute angle between the axis of the clamping roller 4 and the axis of the electron tube 2; Fig.14 As shown, the clamping roller 4 is in the third state, at which time the axis of the clamping roller 4 is parallel to the axis of the electron tube 2 .

[0057] During use, when the vibration amplitude of the fuel is small, the fuel liquid surface is relatively stable. Therefore, the measurement error of the fuel liquid level can be reduced by only adjusting the clamping roller 4 to the first state. When the vibration amplitude of the fuel is moderate, the damping effect of the annular damper only limits the lifting speed of the float 3, but does not limit the lifting displacement of the float 3. As a result, during the vibration of the fuel, the float 3 may still have a large lifting displacement, resulting in a large measurement error of the fuel liquid level. To solve this problem, when the vibration amplitude of the fuel is moderate, the clamping roller 4 is switched to the second state through the switching mechanism. At this time, there is an acute angle between the axis of the clamping roller 4 and the axis of the electron tube 2. During the vibration of the fuel, the fuel level will change, thereby driving the float 3 to move up and down. , and the movement of the float 3 needs to be realized by the rolling of the clamping roller 4 on the electron tube 2, and the rolling of the clamping roller 4 needs to be realized by rotating around its own axis; when the clamping roller 4 rotates around its own axis, since the clamping roller 4 is tilted, the travel path of the clamping roller 4 on the electron tube 2 is a spiral line, thereby driving the float 3 to move along the spiral path at the same time. Since the spiral path lengthens the travel distance of the float 3, when other conditions remain unchanged, the lifting and lowering displacement of the clamping roller 4 in the second state will be reduced compared with the lifting and lowering displacement when the clamping roller 4 is in the first state, thereby avoiding the liquid level error caused by the large axial movement of the float 3 on the one hand, and on the other hand, when the clamping roller 4 moves, it can also clean the oil stains adhering to the electron tube 2 in the circumferential and axial directions at the same time, which is conducive to improving the measurement accuracy of the fuel level.

[0058] Under the premise that the vibration amplitude of the fuel is moderate, when the vibration amplitude of the fuel increases, the measurement error of the fuel level will increase. To solve this problem, the size of the acute angle is set to be negatively correlated with the vibration amplitude of the fuel, that is, the larger the vibration amplitude of the fuel, the smaller the acute angle between the axis of the clamping roller 4 and the axis of the electron tube 2, and the closer the clamping roller 4 is to a vertical setting; when the acute angle between the axis of the clamping roller 4 and the axis of the electron tube 2 is smaller, the pitch of the spiral path is smaller, so that the travel distance of the float 3 is further lengthened, and then the lifting displacement of the float 3 is further reduced, so that the measurement error of the fuel level can be effectively reduced.

[0059] When the vibration amplitude of the fuel is large, the vibration of the fuel is very violent. Although the lifting speed and lifting displacement of the float 3 are limited at this time, the float 3 will still float along the axial direction driven by the fuel, resulting in a measurement error of the fuel level. To solve this problem, it is configured to switch the clamping roller 4 to the third state through a switching mechanism. At this time, the axis of the clamping roller 4 is parallel to the axis of the electron tube 2. Under the impact of the fuel, the float 3 rotates at the same time. On the one hand, it can lock the height of the float 3 in the axial direction to avoid signal instability and mechanical wear caused by frequent movement. On the other hand, it can consume the impact energy of the fuel on the float 3 to prevent slipping.

[0060] In a further embodiment, the switching mechanism is configured to include a floating ring 61 and a plurality of pairs of switching components. The floating ring 61 is sleeved on the electron tube 2 and can slide relative to the float 3 along the axial direction of the electron tube 2. Two switching components of the same pair are correspondingly arranged with the same clamping roller 4 and are symmetrically arranged between the float 3 and the floating ring 61. The switching component includes a first adjustment frame 621, a second adjustment frame 622, a slider 623, a one-way damper 624, a telescopic plate 625 and a transmission part. The first ends of the first adjustment frame 621 and the second adjustment frame 622 are both circumferentially slidably inserted on the floating ring 61, and the second ends are The first adjusting frame 621 and the second adjusting frame 622 are both slidably inserted on the float 3 along the axial direction of the electron tube 2; the slider 623 is arranged on the float 3 and can slide elastically along the radial direction of the electron tube 2; the one-way damper 624 is fixedly arranged on the float 3, and the output end is arranged on the slider 623, and is configured to prevent the slider 623 from moving away from the electron tube 2; one end of the telescopic plate 625 is hinged on the first adjusting frame 621, and the other end is hinged on the second adjusting frame 622, and can form a sliding fit with the slider 623; the transmission part is configured to convert the movement of the slider 623 into the rotation of the clamping roller 4 around the first axis.

[0061] Specifically in this embodiment, Figure 1 As shown, the fixed seat 1 has four slide bars 11, and the four slide bars 11 are evenly arranged along the circumferential direction. The slide bars 11 extend along the axial direction of the fixed seat 1. When installed, the four slide bars 11 simultaneously penetrate the upper and lower end surfaces of the floating ring 61 and form a sliding fit with the floating ring 61. The number of switching components can be set to eight, and the two switching components of the same pair are symmetrically arranged about the clamping roller 4.

[0062] like Figure 7As shown, the first adjusting frame 621 is composed of a first vertical plate portion and a first horizontal plate portion. The first vertical plate portion is vertically arranged during use, and a notch is provided on the plate surface of the first vertical plate portion. The first horizontal plate portion is horizontally arranged during use, with its inner end perpendicularly and fixedly connected to the outer plate surface of the first vertical plate portion, and its outer end is suspended. The second adjusting frame 622 is composed of a second vertical plate portion and a second horizontal plate portion. The second vertical plate portion is vertically arranged during use, and a notch is provided on the plate surface of the second vertical plate portion. The second horizontal plate portion is horizontally arranged during use, with its inner end perpendicularly and fixedly connected to the outer plate surface of the second vertical plate portion, and its outer end is suspended.

[0063] To facilitate the first ends of both the first adjusting frame 621 and the second adjusting frame 622 to be slidably inserted circumferentially onto the floating ring 61, as Figure 6 shown, two first annular grooves 611 and two second annular grooves 711 are coaxially provided on the inner peripheral wall of the floating ring 61. The two first annular grooves 611 are arranged at intervals along the axial direction, and the two second annular grooves 711 are located between the two first annular grooves 611 and are arranged at intervals along the axial direction. As Figure 5 shown, when the first adjusting frame 621 is installed, the right end of the first horizontal plate portion is slidably inserted into the upper first annular groove 611, and when the second adjusting frame 622 is installed, the right end of the second horizontal plate portion is slidably inserted into the upper second annular groove 711.

[0064] To facilitate the second ends of both the first adjusting frame 621 and the second adjusting frame 622 to be slidably inserted along the axis direction of the electron tube 2 onto the float 3, as Fig.10 shown, four first vertical grooves 301 are vertically and penetratingly provided on the top surface of the float 3. The first vertical grooves 301 are of a T-shaped structure, with the small end facing outward and penetrating the outer peripheral wall of the float 3. As Fig.12 shown, the first vertical grooves 301 and the fixing ring 32 are correspondingly arranged; sixteen vertical rails 31 are provided on the float 3. As Fig.10 shown, the vertical rails 31 are of a "C"-shaped strip structure and extend along the axis direction of the float 3. The sixteen vertical rails 31 are evenly divided into two large groups, and each large group is evenly divided into four small groups. The two large groups are respectively arranged on the upper and lower end faces of the float 3. The four small groups are evenly arranged circumferentially. Two vertical rails 31 of the same group are arranged on both sides of the first vertical groove 301 and have their openings facing each other, and a third vertical groove 311 is formed within the vertical rails 31. As Fig.12 shown, the third vertical grooves 311 on the two vertical rails 31 of the same group and the first vertical groove 301 together form a "tu" (Chinese character for "soil") - shaped structure. As Figure 5 shown, when the first adjusting frame 621 is installed, the first vertical plate portion is simultaneously slidably inserted into the third vertical grooves 311 on the two vertical rails 31 of the same group, and when the second adjusting frame 622 is installed, the second vertical plate portion is slidably inserted into the large end of the first vertical groove 301.

[0065] like Fig.10 and Fig.11 As shown, a transverse groove 303 is provided on the right end surface of the first vertical groove 301, the transverse groove 303 passes through the top surface of the float 3 and extends in the radial direction of the float 3, and the cross-sectional shape of the transverse groove 303 is set to be a "cross" shape; Figure 5 As shown, the slider 623 and the one-way damper 624 are both inserted into the transverse groove 303 during installation, and the one-way damper 624 is located at the end of the transverse groove 303 close to the axis of the float 3, as shown in FIG. Figure 7 As shown, a "cross"-shaped protrusion is provided at the left end of the slider 623, and the protrusion is slidably inserted into the transverse groove 303 during installation so that the slider 623 can slide along the transverse groove 303; and a third compression spring 6241 is connected between the slider 623 and the one-way damper 624, and the third compression spring 6241 is used to realize the reset of the slider 623.

[0066] like Figure 7 As shown, the telescopic plate 625 is composed of a first comb tooth dividing plate 6251 and a second comb tooth dividing plate 6252, and the comb tooth sections of the first comb tooth dividing plate 6251 and the second comb tooth dividing plate 6252 are staggered and plugged in to achieve telescopic cooperation; the right end of the first comb tooth dividing plate 6251 is hinged to the notch of the first vertical plate part of the first adjustment frame 621 when installed, and the left end of the second comb tooth dividing plate 6252 is hinged to the notch of the second vertical plate part of the second adjustment frame 622 when installed.

[0067] During the vibration of the fuel, the liquid level of the fuel will change, thereby driving the float 3 and the floating ring 61 to move up and down. Since the float 3 is restricted by the annular damper and the floating ring 61 is not restricted, the floating ring 61 has a larger lifting displacement than the float 3, thereby enabling the floating ring 61 to slide relative to the float 3 along the axial direction of the electron tube 2. The floating ring 61 simultaneously drives the first adjustment frame 621 and the second adjustment frame 622 to move up and down, thereby enabling the telescopic plate 625 to move up and down relative to the slider 623.

[0068] When the vibration amplitude of the fuel is small, the floating ring 61 floats up and down, synchronously driving the first adjustment frame 621 and the second adjustment frame 622 to move up and down. Since the vibration amplitude of the fuel is small, the sliding distance of the floating ring 61 relative to the float 3 along the axial direction is small, so that the telescopic plate 625 will not contact the slider 623, thereby failing to drive the slider 623 to move along the transverse groove 303, and failing to drive the clamping roller 4 to rotate around the first axis through the transmission part, so that the axis of the clamping roller 4 is perpendicular to the axis of the electron tube 2, and the clamping roller 4 remains in the first state.

[0069] When the vibration amplitude of the fuel is moderate, the floating ring 61 floats up and down, synchronously driving the first adjustment frame 621 and the second adjustment frame 622 to move up and down. Since the vibration amplitude of the fuel is moderate, the sliding distance of the floating ring 61 relative to the float 3 in the axial direction is moderate, so that the telescopic plate 625 will contact the slider 623, thereby driving the slider 623 to move along the transverse groove 303, and the third compression spring 6241 is synchronously compressed, thereby driving the clamping roller 4 to rotate around the first axis through the transmission part, so that the axis of the clamping roller 4 and the axis of the electron tube 2 have an acute angle, and the clamping roller 4 remains in the second state; and the greater the vibration amplitude of the fuel, the greater the sliding distance of the floating ring 61 relative to the float 3 in the axial direction, thereby causing the slider 623 to move along the transverse groove 303. The greater the angle of rotation of the clamping roller 4 around the first axis through the transmission part, the smaller the acute angle between the axis of the clamping roller 4 and the axis of the electron tube 2, and the closer to the vertical.

[0070] When the vibration amplitude of the fuel oil is large, the floating ring 61 floats up and down, synchronously driving the first adjustment frame 621 and the second adjustment frame 622 to move up and down. Due to the large vibration amplitude of the fuel oil, the sliding distance of the floating ring 61 relative to the float 3 in the axial direction is large, so that the telescopic plate 625 will contact the slider 623, thereby driving the slider 623 to move along the transverse groove 303, and the third compression spring 6241 is compressed, thereby driving the clamping roller 4 to rotate around the first axis through the transmission part, so that the axis of the clamping roller 4 is perpendicular to the axis of the electron tube 2, and the clamping roller 4 remains in the third state.

[0071] When the slider 623 moves to the extreme position, the slider 623 slowly resets under the joint action of the third compression spring 6241 and the one-way damper 624 to avoid the slider 623 resetting too quickly, causing the clamping roller 4 to be quickly reset through the transmission part, thereby preventing the state of the clamping roller 4 from being maintained for only a short time.

[0072] In a further embodiment, the transmission part can be configured to include an inclined groove 6261, a gear 6262 and a rack 6263, wherein the inclined groove 6261 is arranged on the slider 623; the gear 6262 is arranged on the clamping roller 4; the rack 6263 is inserted on the float 3 and extends along the axial direction of the electron tube 2, the top end of the rack 6263 is slidably inserted in the inclined groove 6261, and the bottom end is engaged with the gear 6262.

[0073] Specifically in this embodiment, Figure 7 As shown, the inclined groove 6261 is arranged on the front side wall of the slider 623 and extends obliquely in the upper right direction; a sliding column is arranged on the rear side wall of the rack 6263 near the top, and the sliding column is slidably inserted into the sliding groove 81 when in use; Figure 8 As shown, the gear 6262 is fixedly sleeved on the end of the mounting ring 42 away from the mounting frame 41; to avoid interference, as shown in FIG. Fig.10 and Fig.11 As shown, eight second vertical grooves 302 are arranged on the top surface of the float 3. The eight second vertical grooves 302 are grouped in pairs. The two second vertical grooves 302 in the same group are respectively arranged on both sides of the transverse groove 303. The rack 6263 is slidably inserted into the second vertical groove 302 during installation.

[0074] During use, if Figure 5 As shown, when the telescopic plate 625 moves upward relative to the slider 623, the slider 623 moves to the left under the push of the top inclined surface of the telescopic plate 625, and the third compression spring 6241 is synchronously compressed. The greater the distance the telescopic plate 625 moves upward relative to the slider 623, the greater the distance the slider 623 moves to the left, and the greater the degree of compression of the third compression spring 6241. In the process of the slider 623 moving to the left, the rack 6263 moves upward under the guidance of the inclined groove 6261, and synchronously drives the mounting ring 42 to rotate forward through the engagement with the gear 6262. The mounting ring 42 drives the clamping roller 4 to rotate around the first axis through the mounting frame 41 to switch the state of the clamping roller 4.

[0075] Similarly, when the third compression spring 6241 pushes the lower slider 623 to move to the right, the lower rack 6263 moves downward under the guidance of the inclined groove 6261, and synchronously drives the mounting ring 42 to rotate in the opposite direction through the engagement with the gear 6262. The mounting ring 42 drives the clamping roller 4 to rotate around the first axis through the mounting frame 41 to switch the state of the clamping roller 4.

[0076] In other embodiments, the transmission part may also be configured to include a friction strip, which may replace the rack 6263 and the gear 6262 and form a friction fit with the mounting ring 42 to drive the clamping roller 4 to rotate.

[0077] In other embodiments, when the fuel level is higher, the volume of the fuel itself is larger, and the inertia is larger. At the same time, the activity of the fuel is smaller, so that the amount by which the float 3 can float up and down is smaller, and then the measurement error of the fuel level caused by the fuel vibration is smaller, so that the required adjustment ability of the fuel level sensor is smaller, and sensitive adjustment will accelerate the mechanical wear of the parts and affect the service life; similarly, when the fuel level is lower, the volume of the fuel itself is smaller, and the inertia is smaller. At the same time, the activity of the fuel is larger, so that the amount by which the float 3 can float up and down is larger, and then the measurement error of the fuel level caused by the fuel vibration is larger, so that the required adjustment ability of the fuel level sensor is larger, and sensitive adjustment is necessary at this time; in order to adapt to this trend and improve the versatility of the fuel level sensor, it is set that the fuel level sensor also includes a first adjustment mechanism 7, and the first adjustment mechanism 7 is configured to be able to adjust the inclination angle of the telescopic plate 625 according to the height of the liquid level of the float 3, so that when the liquid level of the float 3 is higher, the inclination angle of the telescopic plate 625 is adjusted to be larger and closer to the vertical.

[0078] During use, when the liquid level of the float 3 is higher, the inclination angle of the telescopic plate 625 is adjusted to be larger and closer to the vertical, so that the distance that the telescopic plate 625 can drive the slider 623 to move in the radial direction of the electron tube 2 when the telescopic plate 625 moves upward by a unit distance is smaller, thereby reducing the number of turns of the clamping roller 4 around the first axis to reduce the speed of the state switching of the clamping roller 4; when the liquid level of the float 3 is lower, the inclination angle of the telescopic plate 625 is adjusted to be smaller and closer to the horizontal, so that the distance that the telescopic plate 625 can drive the slider 623 to move in the radial direction of the electron tube 2 when the telescopic plate 625 moves upward by a unit distance is larger, thereby increasing the number of turns of the clamping roller 4 around the first axis to increase the speed of the state switching of the clamping roller 4, thereby adjusting the state switching of the clamping roller 4 to have a suitable speed according to different fuel liquid levels, further improving the accuracy of fuel level detection.

[0079] In a further embodiment, the first adjustment mechanism 7 is configured to include two sliding rings 71, a plurality of wedge blocks 72 and a plurality of wedge rods 73. The two sliding rings 71 are coaxially arranged on the floating ring 61 and can both slide along the axial direction of the floating ring 61; the wedge blocks 72 are correspondingly arranged to the two switching components of the same pair and can slide along the radial direction of the floating ring 61 and simultaneously form a guiding fit with the two sliding rings 71; the wedge rods 73 are correspondingly arranged to the wedge blocks 72 and are fixedly arranged on the fixing seat 1, the wedge rods 73 extend along the axial direction of the electron tube 2 and form a guiding fit with the wedge blocks 72.

[0080] Specifically in this embodiment, Figure 6 As shown, a fixed rod 612 is provided on the floating ring 61, and the fixed rod 612 extends along the axial direction of the floating ring 61 and penetrates the two sliding rings 71 at the same time to limit the rotation of the sliding ring 71; the number of the fixed rods 612 can be four, and the four fixed rods 612 are evenly arranged along the circumferential direction; a wedge-shaped annular surface 712 is provided on the outer peripheral wall of the sliding ring 71, and the wedge-shaped annular surfaces 712 on the two sliding rings 71 are symmetrically arranged and together form an "eight"-shaped structure, and the flared opening is arranged outward; the wedge block 72 is set as a U-shaped structure, and the opening is set inward, and is inserted into the floating ring 61 during installation. The number of the wedge blocks 72 can be four, and they are evenly arranged along the circumferential direction. The two suspended ends of the wedge block 72 are provided with a first wedge surface, and the first wedge surface and the wedge surface 712 form a guiding fit; as shown Figure 1 As shown, the wedge rod 73 is vertically arranged on the fixing seat 1 and penetrates the floating ring 61 during installation. The side wall surface of the wedge rod 73 facing the electron tube 2 is set as a second wedge surface. The second wedge surface is set as an inclined surface and is inclined from top to bottom in a direction away from the electron tube 2 to form a guiding match with the wedge block 72. The number of the wedge rods 73 can be four, and the four wedge rods 73 are evenly arranged along the circumferential direction; as shown in FIG. Figure 6As shown, the second annular groove 711 is formed on the inner peripheral wall of the sliding ring 71 .

[0081] During use, when the fuel level is higher, the distance that the wedge block 72 moves inward under the push of the second wedge surface is greater. Figure 5 As shown, when the wedge block 72 moves inward, the two sliding rings 71 are synchronously driven to move away from each other through the guiding cooperation between the first wedge surface and the wedge ring surface 712. When the two sliding rings 71 move away from each other, as shown in FIG. Figure 5 As shown, the sliding ring 71 synchronously drives the second adjustment frame 622 to move toward the first adjustment frame 621, so that the inclination angle of the telescopic plate 625 becomes smaller.

[0082] Similarly, when the fuel level is lower, the distance that the wedge block 72 moves outward under the push of the second wedge surface is greater. Figure 5 As shown, when the wedge block 72 moves outward, the two sliding rings 71 are synchronously driven to approach each other through the guiding cooperation between the first wedge surface and the wedge ring surface 712. When the two sliding rings 71 approach each other, the sliding ring 71 synchronously drives the second adjustment frame 622 to move away from the first adjustment frame 621, so that the inclination angle of the telescopic plate 625 becomes larger.

[0083] In other embodiments, when the pitch of the spiral path is small to a certain extent, the clamping roller 4 is prone to getting stuck. To solve this problem, the fuel level sensor is configured to also include a second adjustment mechanism. The second adjustment mechanism is configured to adjust the acute angle to be negatively correlated with the vibration amplitude of the fuel when the vibration amplitude of the fuel is less than a preset amplitude; and to adjust the acute angle to be equal to zero when the vibration amplitude of the fuel is greater than the preset amplitude.

[0084] In a further embodiment, the second adjustment mechanism is configured to include multiple pairs of slide grooves 81 and multiple pairs of elastic protrusions 82. The slide grooves 81 are arranged on the float 3 and extend in a direction perpendicular to the axis of the electron tube 2; the two slide grooves 81 of the same pair are correspondingly arranged on the same slider 623; the two elastic protrusions 82 of the same pair are arranged on the same slider 623, and are respectively slidably inserted into the two slide grooves 81 of the same pair.

[0085] Specifically in this embodiment, the number of elastic protrusions 82 can be set to four pairs, such as Figure 7 As shown, the two elastic protrusions 82 of the same pair are arranged on the front and rear side walls of the same slider 623; the number of the slide grooves 81 can be set to four pairs, such as Fig.11As shown, the two slide grooves 81 of the same pair are symmetrically arranged on the two side wall surfaces of the same transverse groove 303, and the slide grooves 81 are located at the innermost side of the transverse groove 303. The length of the slide grooves 81 is set to be equal to the distance moved by the slider 623 when the angle between the axis of the clamping roller 4 and the axis of the electron tube 2 is perpendicular to 45 degrees; when the angle between the axis of the clamping roller 4 and the axis of the electron tube 2 is 45 degrees, the vibration amplitude of the fuel is the preset amplitude.

[0086] During use, when the vibration amplitude of the fuel is less than the preset amplitude, the elastic protrusion 82 slides normally in the slide groove 81; when the vibration amplitude of the fuel is greater than the preset amplitude, the slider 623 drives the elastic protrusion 82 to cross the slide groove 81 and move inward to the extreme position, so that the angle between the axis of the clamping roller 4 and the axis of the electron tube 2 is changed from 45 degrees to the axis of the clamping roller 4 and the axis of the electron tube 2 are parallel to each other, thereby avoiding the problem that the clamping roller 4 is easily stuck when the pitch of the spiral path is small to a certain extent.

[0087] In other embodiments, in order to improve the working performance of the clamping roller 4 when it is in different states, the friction coefficient of the middle part of the clamping roller 4 is set to be smaller than the friction coefficient of the two ends.

[0088] Specifically in this embodiment, when the clamping roller 4 is in the first state or the second state, the clamping roller 4 contacts the electron tube 2 with the middle part. Since the friction coefficient of the middle part of the clamping roller 4 is smaller than the friction coefficient of the two ends, the friction force that needs to be overcome when the clamping roller 4 rotates around its own axis is smaller, thereby making it easier for the clamping roller 4 to rotate around its own axis, and while being able to more easily drive the float 3 to move up and down, the float 3 can better reflect the real liquid level of the fuel; when the clamping roller 4 is in the third state, the clamping roller 4 contacts the electron tube 2 with the middle part and the two ends at the same time. Since the friction coefficient of the middle part of the clamping roller 4 is smaller than the friction coefficient of the two ends, the friction force that needs to be overcome when the clamping roller 4 rotates around its own axis is larger, thereby making it more difficult for the clamping roller 4 to rotate around its own axis, thereby improving the stability of the clamping roller 4 when locked on the electron tube 2.

[0089] In other embodiments, the rigid clamping of the electron tube 2 by the clamping roller 4 causes severe wear between the clamping roller 4 and the electron tube 2 when the clamping roller 4 rotates; in order to reduce the mechanical wear between the clamping roller 4 and the electron tube 2, it is configured that the clamping roller 4 is elastically clamped on the electron tube 2.

[0090] Specifically in this embodiment, Figure 8 As shown, the mounting ring 42 and the second part of the mounting frame 41 are splined, so that the mounting ring 42 can drive the clamping roller 4 to rotate synchronously around the first axis through the mounting frame 41, and the mounting ring 42 and the mounting frame 41 can slide relative to each other; a second compression spring 43 is inserted inside the mounting ring 42, as shown in FIG. Figure 5As shown, the second compression spring 43 is arranged horizontally when in use, with the left end arranged on the right end of the mounting frame 41 and the right end arranged on the float 3 . Under the action of the second compression spring 43 , the clamping roller 4 is elastically clamped on the electron tube 2 .

[0091] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A fuel level sensor, characterized in that: The fuel level sensor comprises a fixing seat, an electron tube is arranged on the fixing seat, a float is sleeved on the electron tube, the float can slide along the axis direction of the electron tube, a clamping roller and a plurality of annular dampers are inserted in the float, the clamping roller can rotate around its own axis; there are a plurality of clamping rollers, and the plurality of clamping rollers are arranged along the circumferential direction to clamp the electron tube together; the annular damper is connected between the float and the clamping roller, and is configured to hinder the rotation of the clamping roller around its own axis; the clamping roller is configured to have a first state according to the vibration amplitude of the fuel, and in the first state, the axis of the clamping roller is perpendicular to the axis of the electron tube; The clamping roller is capable of rotating around a first axis, and the first axis extends in the radial direction of the electron tube; the clamping roller is further configured to have a second state and a third state according to the vibration amplitude of the fuel, and in the second state, there is an acute angle between the axis of the clamping roller and the axis of the electron tube, and the size of the acute angle is negatively correlated with the vibration amplitude of the fuel; in the third state, the axis of the clamping roller is parallel to the axis of the electron tube; the fuel level sensor also includes a switching mechanism, and the switching mechanism is configured to be able to switch the state of the clamping roller between the first state, the second state and the third state.

2. The fuel level sensor according to claim 1, characterized in that: The switching mechanism comprises a floating ring and a plurality of pairs of switching components, wherein the floating ring is sleeved on the electron tube and can slide relative to the float along the axis direction of the electron tube; the two switching components of the same pair are arranged correspondingly to the same clamping roller and are symmetrically arranged between the float and the floating ring; the switching component comprises a first adjustment frame, a second adjustment frame, a slider, a one-way damper, a telescopic plate and a transmission part, wherein the first ends of the first adjustment frame and the second adjustment frame are both inserted and slidably mounted on the floating ring along the circumferential direction, and the second ends are both inserted and slidably mounted on the float along the axis direction of the electron tube; the slider is arranged on the float and can slide elastically along the radial direction of the electron tube; the one-way damper is fixedly arranged on the float, and the output end is arranged on the slider, and is configured to prevent the slider from moving in a direction away from the electron tube; one end of the telescopic plate is hinged on the first adjustment frame, and the other end is hinged on the second adjustment frame, and can form a sliding fit with the slider; the transmission part is configured to convert the movement of the slider into the rotation of the clamping roller around the first axis.

3. The fuel level sensor according to claim 2, characterized in that: The transmission part includes an inclined groove, a gear and a rack. The inclined groove is arranged on the slider; the gear is arranged on the clamping roller; the rack is inserted on the float and extends along the axial direction of the electron tube. The top end of the rack is slidably inserted in the inclined groove, and the bottom end is meshed with the gear.

4. The fuel level sensor according to claim 2, characterized in that: The fuel level sensor also includes a first adjustment mechanism, which is configured to adjust the inclination angle of the telescopic plate according to the height of the liquid level of the float, so that when the liquid level of the float is higher, the inclination angle of the telescopic plate is adjusted to be larger and closer to vertical.

5. The fuel level sensor according to claim 4, characterized in that: The first adjustment mechanism includes two sliding rings, a plurality of wedge blocks and a plurality of wedge rods. The two sliding rings are coaxially arranged on the floating ring and can slide along the axial direction of the floating ring. The wedge blocks are arranged correspondingly to the two switching assemblies of the same pair and can slide along the radial direction of the floating ring and form a guiding fit with the two sliding rings at the same time. The wedge rods are arranged correspondingly to the wedge blocks and are fixedly arranged on the fixing seat. The wedge rods extend along the axial direction of the electron tube and form a guiding fit with the wedge blocks.

6. The fuel level sensor according to claim 2, characterized in that: The fuel level sensor also includes a second adjustment mechanism, which is configured to adjust the acute angle to be negatively correlated with the vibration amplitude of the fuel when the vibration amplitude of the fuel is less than a preset amplitude; and to adjust the acute angle to be equal to zero when the vibration amplitude of the fuel is greater than the preset amplitude.

7. The fuel level sensor according to claim 6, characterized in that: The second adjustment mechanism includes multiple pairs of slide grooves and multiple pairs of elastic protrusions. The slide grooves are arranged on the float and extend in a direction perpendicular to the axis of the electron tube; the two slide grooves of the same pair are correspondingly arranged on the same slider; the two elastic protrusions of the same pair are arranged on the same slider and are respectively slidably inserted into the two slide grooves of the same pair.

8. The fuel level sensor according to claim 1, characterized in that: The friction coefficient of the middle portion of the nip roller is smaller than the friction coefficient of the two ends.

9. The fuel level sensor according to claim 1, characterized in that: The clamping roller is elastically clamped on the electron tube.

Images