Oil level sensor calibration tool

Abstract

The utility model discloses an oil level sensor calibration tool which comprises a box body, a standard liquid level sensor and a support assembly, and an oil storage space is arranged in the box body. The standard liquid level sensor is connected with the box body and at least partially located in the oil storage space. The support assemblies are connected with the box body and located in the oil storage space, and the support assemblies are used for supporting the oil level sensor and enabling the oil level sensor to be located at a set position and a set angle. According to the oil level sensor calibration tool, the support assembly is configured to enable the oil level sensor to be located at the set position and the set angle, the support assembly is designed according to needs, and the oil level sensor can simulate the installation state of the oil level sensor under the actual use working condition for calibration. Therefore, the difference between the installation state of the oil level sensor in the calibration process and the installation state of the oil level sensor in actual use is effectively reduced, the calibration accuracy of the oil level sensor is improved, and then the accuracy and reliability of the measurement result of the oil level sensor are improved.

Description

Technical Field

[0001] This utility model relates to the field of calibration technology, and in particular to a calibration fixture for an oil level sensor. Background Technology

[0002] Fuel level sensors are crucial components of the fuel system on aircraft and other flying vehicles. They measure the amount of fuel remaining in the aircraft's fuel tanks, allowing pilots to determine the flight range. The accuracy and precision of the fuel level sensor measurements are critical to the smooth conduct of flight missions and can even affect flight safety. Therefore, fuel level sensors must be calibrated in a simulated fuel tank before leaving the factory.

[0003] In related technologies, a common simulated fuel tank is currently used to calibrate multiple fuel level sensors of the same aircraft. The multiple fuel level sensors are installed in the same installation state in the simulated fuel tank. This results in a large difference between the measurement attitude of each fuel level sensor during the calibration process and its measurement attitude when it is actually used in the aircraft's fuel tank. As a result, when the calibrated sensors are actually installed in the aircraft's fuel tank, the measurement accuracy of the fuel level is found to be poor. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an oil level sensor calibration fixture that can simulate the installation state of the oil level sensor under actual operating conditions for calibration, thereby improving the accuracy of oil level sensor calibration and thus improving the precision and reliability of oil quantity measurement results.

[0005] The oil level sensor calibration fixture according to an embodiment of the present invention includes:

[0006] The tank has an internal oil storage space;

[0007] A standard liquid level sensor is connected to the housing and is at least partially located within the oil storage space; and

[0008] Multiple support assemblies are connected to the housing and located within the oil storage space. The support assemblies are used to support the oil level sensor and position the oil level sensor at a set position and angle.

[0009] The oil level sensor calibration fixture according to the embodiments of this utility model has at least the following beneficial effects:

[0010] In this invention, the oil level sensor calibration fixture includes a housing and a standard liquid level sensor. At least a portion of the standard liquid level sensor is located within the oil storage space of the housing. Multiple support assemblies are connected to the housing. Multiple oil level sensors to be calibrated are supported within the oil storage space by the multiple support assemblies. The support assemblies are configured to position the oil level sensors at a set position and angle. By designing the support assemblies as needed, the oil level sensors can be calibrated in a manner that simulates their installation state under actual operating conditions. This effectively reduces the difference between the installation state during the calibration process and the actual installation state during use, thereby improving the accuracy of the oil level sensor calibration and ultimately enhancing the precision and reliability of the oil level sensor's oil quantity measurement results.

[0011] According to some embodiments of the present invention, the support assembly includes:

[0012] A support frame is connected to the inner wall of the housing;

[0013] Mounting bracket, mounted on the support frame, and connected to the oil level sensor;

[0014] In this embodiment, at least one of the bracket assemblies has an angle adjustment section on its mounting bracket, which is used to adjust the mounting angle of the mounting bracket relative to the support frame, and / or, the angle adjustment section is used to adjust the mounting angle of the oil level sensor relative to the support frame, so that the oil level sensor is at the set angle.

[0015] According to some embodiments of the present invention, the mounting bracket includes a mounting plate, the mounting plate includes a first surface facing the support frame, and the support frame includes a second surface facing the mounting plate; the angle adjustment part includes a boss, the boss is disposed between the first surface and the second surface, and is configured to tilt the first surface relative to the second surface in a first direction.

[0016] According to some embodiments of the present invention, the boss includes an abutment surface facing away from the mounting plate and in contact with the support frame. The distance between the abutment surface and the first surface increases or decreases along a second direction, which is perpendicular to the first direction.

[0017] According to some embodiments of the present invention, the boss and the mounting plate are separate connecting structures, or the boss and the mounting plate are integrally formed structures.

[0018] According to some embodiments of the present invention, the mounting bracket is provided with two first positioning holes, the support bracket is provided with two connecting holes, and the mounting bracket is positioned and fixed to the support bracket by first fasteners passing through the first positioning holes and the connecting holes;

[0019] The angle adjustment part further includes two second positioning holes, and the mounting bracket is positioned and connected to the oil level sensor by a second fastener passing through the second positioning holes; wherein, the line connecting the axes of the two second positioning holes is inclined in a third direction relative to the line connecting the axes of the two first positioning holes.

[0020] According to some embodiments of the present invention, the support frame is used to adjust the relative position of the mounting frame in the oil storage space. The support frame includes a connecting plate and a support arm. The connecting plate is connected to the inner wall of the housing. The support arm is connected to the side of the connecting plate away from the inner wall of the housing and is connected to the mounting frame.

[0021] According to some embodiments of the present invention, the box body includes a box body, a cover and a sealing gasket. The box body has an opening, the cover is connected to the box body and covers the opening, and the sealing gasket is sandwiched between the cover and the box body. The sealing gasket is a conductive gasket.

[0022] According to some embodiments of the present invention, the bottom of the housing is provided with an oil passage hole, and the oil level sensor calibration fixture also includes an oil valve, which is connected to the oil passage hole.

[0023] According to some embodiments of the present utility model, the outer wall of the box is provided with a first connecting pipe and a second connecting pipe communicating with the oil storage space. The first connecting pipe is located near the top wall of the box, and the second connecting pipe is located near the bottom wall of the box.

[0024] The oil level sensor calibration fixture also includes a transparent tube, one end of which is connected to the first connecting tube and the other end of which is connected to the second connecting tube.

[0025] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0027] Figure 1 This is a schematic diagram of the structure of the oil level sensor calibration fixture according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the oil level sensor calibration fixture of this utility model with part of the housing removed;

[0029] Figure 3 This is a cross-sectional view of the oil level sensor calibration fixture according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the first type of bracket assembly of the oil level sensor calibration fixture according to an embodiment of the present utility model;

[0031] Figure 5 for Figure 4 A side view of the bracket assembly shown;

[0032] Figure 6 for Figure 4 A schematic diagram of the mounting bracket of the bracket assembly shown;

[0033] Figure 7 This is a schematic diagram of the structure of the second type of bracket assembly of the oil level sensor calibration fixture according to an embodiment of the present invention;

[0034] Figure 8 for Figure 7 A top view of the bracket assembly shown;

[0035] Figure 9 for Figure 4 A bottom view of the bracket assembly shown;

[0036] Figure 10 for Figure 3 A magnified view of a portion of point A in the middle.

[0037] Explanation of icon numbers:

[0038] 10. Oil level sensor calibration fixture;

[0039] 100. Housing; 110. Housing body; 111. Oil storage space; 112. Opening; 113. Oil passage hole;

[0040] 120. Cover; 130. Sealing gasket; 200. Bracket assembly;

[0041] 210. Support frame; 211. Connecting plate; 212. Support arm; 2121. Second surface; 2122. Connecting hole;

[0042] 220. Mounting bracket; 221. Mounting plate; 2211. First surface; 222. Angle adjustment part; 2221. Boss; 2221a. Abutment surface; 2222. Second positioning hole; 223. First positioning hole; 230. First fastener;

[0043] 300, Standard liquid level sensor; 400, First connecting tube; 500, Second connecting tube; 600, Transparent tube. Detailed Implementation

[0044] The following will describe the concept and technical effects of this utility model clearly and completely with reference to the embodiments, so as to fully understand the purpose, features and effects of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the protection scope of this utility model.

[0045] In the description of the embodiments of this utility model, if directional descriptions are involved, such as "up", "down", "front", "back", "left", "right" etc., indicating the directional or positional relationship, they are based on the directional or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] In the description of this utility model embodiment, if a feature is referred to as "setting," "fixing," "connecting," or "installing" on another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, connected, or installed on the other feature. In the description of this utility model embodiment, if "several" is involved, it means one or more; if "multiple" is involved, it means two or more; if "greater than," "less than," or "exceeds," it should be understood as excluding the stated number; if "above," "below," or "within," it should be understood as including the stated number. If "first" or "second" is involved, it should be understood as used to distinguish technical features, and not as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0047] This invention provides a fuel level sensor calibration fixture for calibrating a fuel level sensor by simulating a fuel tank. The fuel tank to which the fuel level sensor is to be calibrated can be the fuel tank of an aircraft, helicopter, or other aircraft, or the fuel tank of a vehicle, ship, or other carrier. The following description will primarily use an aircraft fuel tank as an example to illustrate the fuel level sensor calibration fixture.

[0048] Please refer to Figures 1 to 3 The oil level sensor calibration fixture 10 includes a housing 100 and a standard liquid level sensor 300. The housing 100 can be used to simulate an aircraft fuel tank, such as an airplane fuel tank, and has an internal oil storage space 111. The standard liquid level sensor 300 is connected to the housing 100 and is at least partially located within the oil storage space 111. The oil level sensor to be calibrated is installed within the oil storage space 111 for calibration.

[0049] In related technologies, a common simulated fuel tank is currently used to calibrate multiple fuel level sensors for the same aircraft. These sensors are installed in the same way in the simulated fuel tank, usually vertically. This results in a significant difference between the measurement attitude of each fuel level sensor during calibration and its actual measurement attitude in the aircraft's fuel tank. Consequently, when the calibrated sensors are actually installed in the aircraft's fuel tank, the accuracy of fuel level measurement is found to be poor, and the accuracy and reliability of the fuel level measurement results cannot be guaranteed.

[0050] In this embodiment, the oil level sensor calibration fixture 10 further includes multiple support assemblies 200. These support assemblies 200 are connected to the housing 100 and located within the oil storage space 111. The support assemblies 200 support the oil level sensor and position it at a set location and angle. Each support assembly 200 supports one oil level sensor.

[0051] The oil level sensor is installed in the oil storage space 111 via the bracket assembly 200. Understandably, the structural design of the bracket assembly 200 can affect the angle and orientation of the oil level sensor. By designing the structure of the bracket assembly 200 and controlling its installation position within the housing 100 as needed, the oil level sensor can be positioned at a set angle and position. This allows the oil level sensor to simulate its installation state under actual operating conditions for measurement and calibration as closely as possible. This effectively reduces the difference between the installation state during the calibration process and the actual installation state during use, thereby improving the accuracy of the oil level sensor calibration and ultimately enhancing the precision and reliability of the oil level sensor's oil quantity measurement results.

[0052] In some embodiments, please refer to Figure 4 and Figure 7 , Figure 4 and Figure 7 Schematic diagrams of two different bracket assemblies are provided. The bracket assembly 200 includes a support frame 210 and a mounting frame 220. The support frame 210 is connected to the inner wall of the housing 100, and the mounting frame 220 is mounted on the support member and connected to the oil level sensor.

[0053] Understandably, since the oil level sensor is fixed to the mounting bracket 220, and the mounting bracket 220 is supported in the oil storage space 111 by the support bracket 210, the relative position of the mounting bracket 220 in the oil storage space 111 can be changed by adjusting the installation position of the support bracket 210 on the inner wall of the housing 100, thereby changing the relative position of the oil level sensor in the oil storage space 111. Therefore, the installation position of the support bracket 210 relative to the inner wall of the housing 100 can be determined according to the actual position of the oil level sensor to be calibrated in the aircraft fuel tank.

[0054] Exemplary, in one embodiment, reference Figure 4 As shown, the support frame 210 includes a connecting plate 211 and a support arm 212. The connecting plate 211 is connected to the inner wall of the housing 100, and the support arm 212 is connected to the side of the connecting plate 211 away from the inner wall of the housing 100. The support arm 212 is also connected to the mounting frame 220. The connecting plate 211 defines the planar position of the support frame 210 relative to the inner wall of the housing 100. The support arm 212 can extend away from the connecting plate 211, and the mounting frame 220 can be connected to the end of the support arm 212 away from the connecting plate 211. By controlling the extension length of the support arm 212, the distance of the mounting frame 220 relative to the inner wall of the housing 100 can be controlled. The cooperation of the connecting plate 211 and the support arm 212 determines the vertical, front-back, and horizontal positions of the mounting frame 220 within the oil storage space 111.

[0055] The mounting bracket 220 is used to control the angle and orientation of the oil level sensor. In some embodiments, reference... Figure 5 As shown, at least one bracket assembly 200 has a mounting bracket 220 with an angle adjustment part 222. The angle adjustment part 222 is used to adjust the mounting angle of the mounting bracket 220 relative to the support bracket 210, and / or, the angle adjustment part 222 is used to adjust the mounting angle of the oil level sensor relative to the support bracket 210 so that the oil level sensor is at a set angle.

[0056] In some embodiments, the mounting bracket 220 adjusts the mounting angle of the mounting bracket 220 relative to the support bracket 210 by means of the angle adjustment part 222, so that the oil level sensor can be at a set angle after installation.

[0057] For example, in one embodiment, please refer to Figure 5 And refer to Figure 6 The mounting bracket 220 includes a mounting plate 221, which includes a first surface 2211 facing the support frame 210. The support frame 210 includes a second surface 2121 facing the mounting plate 221. The angle adjustment part 222 includes a boss 2221, which is disposed between the first surface 2211 and the second surface 2121 and configured to tilt the first surface 2211 relative to the second surface 2121 in a first direction.

[0058] In the above embodiment, the boss 2221 is disposed between the first surface 2211 and the second surface 2121, and the first surface 2211 is inclined relative to the second surface 2121 in a first direction. That is, the boss 2221 is disposed between the mounting plate 221 and the support frame 210, and the mounting plate 221 is inclined relative to the support frame 210 in a first direction. Thus, when the oil level sensor is mounted on the mounting plate 221, the oil level sensor is in an inclined posture relative to the support frame 210 in the first direction. By designing the structure of the boss 2221 to adjust the tilt angle between the first surface 2211 and the second surface 2121, the actual operating conditions of the oil level sensor in the aircraft fuel tank can be simulated, so that the oil level sensor is in the angle posture required for actual measurement.

[0059] In this embodiment, the first direction can be the height direction of the housing 100. For ease of explanation, the height direction (i.e., the vertical direction) of the housing 100 is defined as the Z-axis, the width direction (i.e., the horizontal direction) of the housing 100 is defined as the Y-axis, and the front-back direction of the housing 100 is defined as the X-axis. The boss 2221 can tilt the first surface 2211 relative to the second surface 2121 along the Z-axis, thereby tilting the oil level sensor along the Z-axis. Of course, the first direction can also be the width direction or the front-back direction of the housing 100, and the boss 2221 can also tilt the first surface 2211 relative to the second surface 2121 along the Y-axis or X-axis, thereby tilting the oil level sensor along the Y-axis or X-axis. The accompanying drawings of this embodiment use the width direction of the housing 100, i.e., the Y-axis, as an example for illustration and should not be considered a limitation of this application.

[0060] To achieve the inclination of the first surface 2211 relative to the second surface 2121 of the boss 2221, in one embodiment, the boss 2221 includes an abutment surface 2221a facing away from the mounting plate 221 and in contact with the support frame 210. The distance between the abutment surface 2221a and the first surface 2211 increases or decreases along a second direction, which is perpendicular to the first direction. Since the distance between the abutment surface 2221a and the first surface 2211 increases or decreases, meaning the abutment surface 2221a is not parallel to the first surface 2211 and is inclination relative to the first surface 2211, when the boss 2221 contacts the second surface 2121 of the support frame 210 via the abutment surface 2221a, the second surface 2121 is also inclination relative to the first surface 2211.

[0061] Understandably, when the first surface 2211 is inclined relative to the second surface 2121 along the Y-axis, the distance between the abutting surface 2221a and the first surface 2211 can decrease or increase along the Z-axis.

[0062] Optionally, in another embodiment, the boss 2221 may also be composed of a plurality of sub-protrusions arranged at intervals, each sub-protrusion having a different height relative to the first surface 2211. Thus, when the plurality of sub-protrusions are arranged in order of height between the first surface 2211 and the second surface 2121, the distance between the first surface 2211 and the second surface 2121 is different at various points, which can also make the first surface 2211 tilted relative to the second surface 2121.

[0063] The boss 2221 and the mounting plate 221 can be separate components, meaning that the boss 2221 and the mounting plate 221 are independent parts, and the boss 2221 can be connected to the mounting plate 221 through a connecting structure. Alternatively, the boss 2221 and the mounting plate 221 can be integrally formed, meaning that the boss 2221 and the mounting plate 221 are an inseparable whole. In one embodiment, the boss 2221 and the mounting plate 221 are integrally formed.

[0064] Please refer to the reference. Figure 4 and Figure 5 The mounting bracket 220 is provided with two first positioning holes 223, and the support bracket 210 is provided with two connecting holes 2122. The mounting bracket 220 is positioned and fixed to the support bracket 210 by first fasteners 230 passing through the connecting holes 2122 and the first positioning holes 223. The first fasteners 230 can be screws.

[0065] In one embodiment, to facilitate the assembly of the support frame 210 and the mounting frame 220, the first positioning hole 223 extends axially through the boss 2221 and the mounting plate 221. Thus, when the mounting plate 221 and the boss 2221 are two independent components, the first positioning hole 223 actually includes two through holes that respectively penetrate the mounting plate 221 and the boss 2221. The first fastener 230 passes through the connecting hole 2122 and the first positioning hole 223 formed by the two through holes, thereby positioning and connecting the mounting frame 220 and the support frame 210. That is, while the first fastener 230 connects the mounting frame 220 and the support frame 210, it also connects the mounting plate 221 and the boss 2221 of the mounting frame 220 itself. Therefore, by setting the first positioning hole 223 through the boss 2221 and the mounting plate 221, when the mounting plate 221 and the boss 2221 are connected separately, there is no need to set other positioning and connection structures separately for the connection between the mounting plate 221 and the boss 2221, which simplifies the assembly and makes it easy to replace mounting brackets 220 of different specifications.

[0066] Understandably, the first positioning hole 223 serves a positioning and connection function; only two first positioning holes 223 are needed to achieve positioning between the mounting bracket 220 and the support bracket 210. In some embodiments, when the mounting bracket 220 is large or the oil level sensor is heavy, the mounting bracket 220 can also be provided with additional mounting holes to further connect and fix it to the support member, so as to ensure the stability of the connection between the mounting bracket 220 and the support bracket 210.

[0067] The above embodiments describe adjusting the mounting angle of the mounting bracket 220 relative to the support bracket 210 by means of the angle adjustment part 222 (boss 2221). In other embodiments, the mounting angle of the oil level sensor relative to the mounting bracket 220 can also be adjusted by means of the angle adjustment part 222.

[0068] For example, please refer to Figure 8 and Figure 9 The angle adjustment part 222 also includes two second positioning holes 2222. The mounting plate 221 is connected to the oil level sensor through second fasteners (not shown in the figure) passing through the second positioning holes 2222. The line P2 connecting the axes of the two second positioning holes 2222 is inclined in a third direction relative to the line P1 connecting the axes of the two first positioning holes 223, and this third direction is perpendicular to the first direction. Specifically, the outer surface of the oil level sensor can be fitted with two clamps, which are fixed to the mounting plate 221 by the second fasteners, thereby positioning and fixing the oil level sensor to the mounting plate 221 through the clamps.

[0069] Understandably, the first positioning hole 223 serves as the positioning reference for the mounting bracket 220 and the support bracket 210, and the second positioning hole 2222 serves as the positioning reference for the mounting bracket 220 and the oil level sensor. In this embodiment, by setting the line P2 connecting the axes of the two second positioning holes 2222 to be inclined in a third direction relative to the line P1 connecting the axes of the two first positioning holes 223, that is, the positioning reference of the mounting bracket 220 and the oil level sensor is inclined in a third direction relative to the positioning reference of the mounting bracket 220 and the support bracket 210, the oil level sensor will be inclined in a third direction relative to the support bracket 210 after being installed on the mounting plate 221, thus realizing the adjustment of the angle and attitude of the oil level sensor.

[0070] In some embodiments, please refer to the reference Figure 6 and Figure 9 As shown ( Figure 6 and Figure 9 All Figure 4(A schematic diagram of the first type of bracket assembly 200 shown) At least one bracket assembly 200 has an angle adjustment part 222 of the mounting bracket 220 including a boss 2221 and a second positioning hole 2222. The oil level sensor supported by these mounting brackets 220 can be tilted at a certain angle in two directions relative to the support bracket 210 through the angle adjustment function of the boss 2221 and the angle adjustment function of the second positioning hole 2222, so as to achieve the installation angle required for the actual measurement of the oil level sensor and better simulate the installation state of the oil level sensor under actual use conditions.

[0071] Specifically, due to the complex shape of aircraft fuel tanks, the tank body 100 cannot be manufactured to simulate the actual shape of an aircraft fuel tank to facilitate its processing and production. The tank body 100 is generally designed as a regular shape such as a square. Therefore, to ensure that each fuel level sensor can be calibrated simulating its installation state within the aircraft fuel tank, the fuel level sensor supported by one of the bracket components 200 can be used as a reference fuel level sensor (e.g., sensor 0). Then, based on the distance and relative angle of other fuel level sensors within the aircraft fuel tank relative to the reference fuel level sensor, the required installation position and angle of the mounting brackets 220 corresponding to these fuel level sensors within the fuel storage space 111 can be calculated. This allows for targeted configuration of the mounting brackets 220 and support frames 210 of each bracket component 200.

[0072] Please refer to Figure 10 The housing 100 includes a housing body 110 and a cover 120. The housing body 110 has an opening 112 through which an oil level sensor can be inserted into the oil storage space 111. The cover 120 is connected to the housing body 110 and covers the opening 112. Specifically, the housing body 110 and the cover 120 can be connected by screws. Both the housing body 110 and the cover 120 can be made of metal materials, such as stainless steel.

[0073] In some embodiments, the housing 100 further includes a sealing gasket 130, which is sandwiched between the cover 120 and the housing body 110. The sealing gasket 130 is a conductive gasket. The sealing gasket 130 can be a conductive rubber ring. By providing a conductive gasket between the housing 100 and the cover 120, the conductive gasket not only seals the oil storage space 111 but also provides electrical shielding, giving the entire calibration fixture a certain degree of resistance to electromagnetic interference. This effectively prevents electromagnetic interference from affecting the oil level sensor's oil quantity measurement, further improving the accuracy and reliability of the oil level sensor calibration.

[0074] Please refer to this again. Figure 1The bottom of the housing 100 is provided with an oil passage hole 113, through which calibration personnel can add fuel to the oil storage space 111, or the fuel in the oil storage space 111 can be drained from the oil passage hole 113. In some embodiments, the oil level sensor calibration fixture 10 may also include an oil valve (not shown in the figure), which is connected to the oil passage hole 113. The oil valve can regulate the opening or closing of the oil passage hole 113, and can also regulate the opening size of the oil passage hole 113 to adjust the refueling speed or the draining speed.

[0075] In the above embodiment, by providing an oil passage hole 113 at the bottom of the tank 100, fuel can be added through the oil passage hole 113 as needed during the calibration process. During the filling process, there is no need to open the cover 120, which will not interfere with the oil level sensor that is measuring the oil quantity inside the tank 100. At the same time, it is convenient to release the fuel after the oil level sensor calibration is completed.

[0076] In some embodiments, please refer to Figure 1 The outer wall of the housing 100 is provided with a first connecting pipe 400 and a second connecting pipe 500 that communicate with the oil storage space 111. The first connecting pipe 400 is located near the top wall of the housing 100, and the second connecting pipe 500 is located near the bottom wall of the housing 100. The oil level sensor calibration fixture 10 also includes a transparent tube 600, one end of which is connected to the first connecting pipe 400, and the other end of which is connected to the second connecting pipe 500.

[0077] Since the two ends of the transparent tube 600 are connected to the oil storage space 111 through the first connecting tube 400 and the second connecting tube 500 respectively, the transparent tube 600 and the box 100 form a communicating vessel. The fuel in the oil storage space 111 can enter the transparent tube 600 from the bottom through the second connecting tube 500, and the height of the fuel in the transparent tube 600 is the same as the height in the box 100. Thus, the calibration personnel can confirm the oil level in the oil storage space 111 by observing the fuel height in the transparent tube 600, so as to control the amount of fuel injected according to the measurement needs.

[0078] The transparent tube 600 may be printed with graduations indicating the oil volume (or depth), which helps calibration and testing personnel to more intuitively and quickly confirm the oil volume in the oil storage space 111. Alternatively, in some embodiments, a graduation scale may be installed on the outer wall of the housing 100 near the transparent tube 600.

[0079] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A calibration fixture for an oil level sensor, characterized in that, include: The tank has an internal oil storage space; A standard liquid level sensor is connected to the housing and is at least partially located within the oil storage space; and Multiple support assemblies are connected to the housing and located within the oil storage space. The support assemblies are used to support the oil level sensor and position the oil level sensor at a set position and angle.

2. The oil level sensor calibration fixture according to claim 1, characterized in that, The support assembly includes: A support frame is connected to the inner wall of the housing; Mounting bracket, mounted on the support frame, and connected to the oil level sensor; In this embodiment, at least one of the bracket assemblies has an angle adjustment section on its mounting bracket, which is used to adjust the mounting angle of the mounting bracket relative to the support frame, and / or, the angle adjustment section is used to adjust the mounting angle of the oil level sensor relative to the support frame, so that the oil level sensor is at the set angle.

3. The oil level sensor calibration fixture according to claim 2, characterized in that, The mounting bracket includes a mounting plate, the mounting plate including a first surface facing the support frame, and the support frame including a second surface facing the mounting plate; the angle adjustment part includes a boss disposed between the first surface and the second surface, and configured to tilt the first surface relative to the second surface in a first direction.

4. The oil level sensor calibration fixture according to claim 3, characterized in that, The boss includes an abutment surface facing away from the mounting plate and in contact with the support frame. The distance between the abutment surface and the first surface increases or decreases along a second direction, which is perpendicular to the first direction.

5. The oil level sensor calibration fixture according to claim 3, characterized in that, The boss and the mounting plate are either separate connected structures or they are integrally formed structures.

6. The oil level sensor calibration fixture according to any one of claims 2 to 5, characterized in that, The mounting bracket is provided with two first positioning holes, and the support frame is provided with two connecting holes. The mounting bracket is positioned and fixed to the support frame by first fasteners passing through the first positioning holes and the connecting holes. The angle adjustment part further includes two second positioning holes, and the mounting bracket is positioned and connected to the oil level sensor by a second fastener passing through the second positioning holes; wherein, the line connecting the axes of the two second positioning holes is inclined in a third direction relative to the line connecting the axes of the two first positioning holes.

7. The oil level sensor calibration fixture according to any one of claims 2 to 5, characterized in that, The support frame is used to adjust the relative position of the mounting bracket within the oil storage space. The support frame includes a connecting plate and a support arm. The connecting plate is connected to the inner wall of the housing, and the support arm is connected to the side of the connecting plate away from the inner wall of the housing and is connected to the mounting bracket.

8. The oil level sensor calibration fixture according to any one of claims 1 to 5, characterized in that, The enclosure includes a main body, a cover, and a sealing gasket. The main body has an opening, the cover is connected to the main body and covers the opening, and the sealing gasket is sandwiched between the cover and the main body. The sealing gasket is a conductive gasket.

9. The oil level sensor calibration fixture according to any one of claims 1 to 5, characterized in that, The bottom of the housing is provided with an oil passage hole, and the oil level sensor calibration fixture also includes an oil valve, which is connected to the oil passage hole.

10. The oil level sensor calibration fixture according to any one of claims 1 to 5, characterized in that, The outer wall of the housing is provided with a first connecting pipe and a second connecting pipe that communicate with the oil storage space. The first connecting pipe is located near the top wall of the housing, and the second connecting pipe is located near the bottom wall of the housing. The oil level sensor calibration fixture also includes a transparent tube, one end of which is connected to the first connecting tube and the other end of which is connected to the second connecting tube.

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