Aircraft parts flow capacity measuring equipment and optical liquid level measuring device

Abstract

The present invention discloses a device for measuring the flow capacity of aviation parts and a light-sensitive liquid level measuring device thereof, wherein the light-sensitive liquid level measuring device includes a mounting seat, a laser transceiver module and a reflector provided on the mounting seat, the laser transceiver module includes a laser transmitter with a light emitting direction tilted downward and a laser receiver provided below the laser transmitter, and the reflector is used to reflect the laser emitted by the laser transmitter to the laser receiver. The light-sensitive liquid level measuring device provided by the present invention emits a laser at a downward tilt through the laser transmitter, so that the laser passes through the liquid in the measuring pipe and is reflected back to the laser receiver by the reflector. When the liquid in the measuring pipe reaches a preset height, the emitted laser penetrates into the liquid from the upper surface of the liquid surface and changes due to the influence of parameters such as the different refractive index and reflectivity of the air and water surface properties, so that it is promptly sensed by the laser receiver, and the time node when the liquid level reaches the preset height is accurately measured.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level measurement, in particular to a light-sensitive liquid level measuring device and aviation part flow capacity measuring equipment using the light-sensitive liquid level measuring device. Background Art

[0002] Since most aviation parts, such as blades and turbines, have strict requirements for their flow capacity, these parts often have large diameters and irregular cross-sections. Common flowmeters and other measurement methods cannot accurately measure their flow capacity characteristics. To address this, a water storage tank can be connected to the aircraft part. The flow rate of the water in the tank through the aircraft part can be used to measure the flow capacity of the aircraft part.

[0003] However, most existing liquid level measurement devices use a float built into a measuring pipe and a magnetic induction switch for sensing the float's height to achieve measurement. However, due to the gap between the float and the measuring pipe, the float is not in an absolutely vertical state when it rises and falls with the liquid level, but instead swings at a certain angle relative to the measuring pipe. As a result, the action between the float and the magnetic induction switch cannot accurately reflect the actual height of the water surface, but rather has a certain random error from the actual height. Secondly, the induction of the magnetic induction switch has a certain range, and the metal part of the float also has a certain vertical height. When the float rises and falls in the measuring waterway, the magnetic induction switch will continue to operate while the metal part rises and falls within the sensing range of the magnetic induction switch. As a result, the signal output to the system using this measurement structure reflects the water surface height as a certain value, but in fact it is a time period with a certain delay. Therefore, for high-precision aviation parts, it cannot meet the measurement accuracy requirements. Summary of the Invention

[0004] The present invention mainly provides a light-sensitive liquid level measuring device to solve the technical problem that the liquid level height cannot be measured timely and accurately in the flow capacity measuring equipment of aviation parts.

[0005] The present invention also provides a device for measuring the flow capacity of aviation parts, which adopts the above-mentioned light-sensitive liquid level measuring device.

[0006] According to one aspect of the present invention, a photosensitive liquid level measuring device is provided, comprising a mounting base for fixing to a measuring pipe, a laser transceiver module and a reflective plate arranged on the mounting base, the laser transceiver module and the reflective plate being arranged on opposite sides of the measuring pipe, the laser transceiver module comprising a laser emitter arranged with a light emitting direction tilted downward and a laser receiver arranged below the laser emitter, the position of the reflective plate relative to the mounting base being adjustable and being used to reflect the laser emitted by the laser emitter to the laser receiver.

[0007] Preferably, the optical liquid level measuring device also includes a fixing plate, a mounting plate and a fastening nut, the fixing plate is connected to the mounting seat, an adjustment hole is provided on the fixing plate, an adjustment screw is provided on the mounting plate and passes through the adjustment hole, the reflector is provided on the mounting plate and is rotatably arranged along the adjustment hole through the adjustment screw, and the fastening nut is threadedly connected to the extending end of the adjusting screw that passes through the adjustment hole and extends outside the mounting plate.

[0008] Preferably, the adjustment hole is a waist-shaped hole extending in a vertical direction and used for the adjustment screw to move up and down and slide.

[0009] Preferably, the fastening nut is a butterfly nut.

[0010] Preferably, the optical liquid level measuring device further comprises a lifting mechanism connected to the mounting seat, the laser transceiver module and the reflector plate are both arranged on the lifting mechanism, and the lifting mechanism is used to drive the laser transceiver module and the reflector plate to move up and down relative to the mounting seat.

[0011] Furthermore, the lifting mechanism includes a lifting seat, a lifting nut and a lifting bolt. The laser transceiver module and the reflector plate are both installed on the lifting seat. The lifting seat is arranged below the mounting seat. The lifting nut is fixedly connected to the lifting seat. The mounting seat is provided with a lifting hole. The lifting bolt passes through the lifting hole along the top of the mounting seat and is threadedly connected to the lifting nut.

[0012] Furthermore, the lifting seat includes a guide sleeve for being sleeved on the measuring pipe and arranged to be lifted and slidable along the measuring pipe.

[0013] Preferably, the optical liquid level measuring device further includes a light shield, and the laser transceiver module and the reflective plate are both arranged in the light shield.

[0014] According to the second aspect of the present invention, there is also provided an aviation parts flow capacity measuring device, comprising a water storage cylinder and a measuring station provided at the bottom of the water storage cylinder and used for installing aviation parts, as well as a measuring pipe connected to the water storage cylinder and maintaining the same liquid level height as the water storage cylinder, and the above-mentioned photosensitive liquid level measuring device provided on the measuring pipe and used to send a signal when the liquid level in the measuring pipe reaches a preset height position.

[0015] Preferably, the water storage cylinder includes a first water storage cylinder with the measuring station provided at the bottom and a second water storage cylinder connected to the top of the first water storage cylinder, the diameter of the second water storage cylinder is larger than the diameter of the first water storage cylinder, the measuring pipe includes a first measuring pipe connected to the first water storage cylinder and a second measuring pipe connected to the second water storage cylinder, and the optical liquid level measuring device includes a first optical liquid level measuring device provided on the first measuring pipe and a second optical liquid level measuring device provided on the second measuring pipe.

[0016] The present invention has the following beneficial effects:

[0017] In the optical liquid level measuring device provided by the present invention, the measuring pipe at the position to be measured is a pipe that can be directionally penetrated by laser. The laser emitter emits laser light in an inclined state relative to the measuring pipe, so that the laser light can pass through the liquid in the measuring pipe and then be reflected back to the laser receiver by the reflector. When in use, liquid is first introduced to make the liquid flow toward the measuring pipe at the position to be measured. When the liquid in the measuring pipe reaches a preset height, the emitted laser light penetrates the liquid from the upper surface of the liquid surface and changes under the influence of parameters such as the different refractive index and reflectivity of the air and water surface, so that it is timely sensed by the laser receiver and the time node when the liquid level reaches the preset height is accurately measured. Secondly, because the laser emitter and the laser receiver are arranged in the same module, the spacing and angle between the two can be precisely controlled and are not affected by the diameter of the measuring pipe. During installation, only the position of the reflector needs to be adjusted to achieve better measurement accuracy, effectively reducing the difficulty of measurement operation and ensuring measurement accuracy. It can be better applied to the flow capacity measurement equipment of aviation parts with high parameter requirements for flow capacity measurement of aviation parts.

[0018] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 A three-dimensional diagram of a light-sensitive liquid level measuring device provided in an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A three-dimensional view of the optical liquid level measuring device from another angle;

[0022] Figure 3 for Figure 1 Reference diagram of the optical liquid level measuring device in use;

[0023] Figure 4 A schematic diagram of the structure of an aviation parts flow capacity measurement device provided by an embodiment of the present invention;

[0024] Figure 5 for Figure 4 A partial enlarged view of area A in the flow capacity measurement equipment of aviation parts is shown.

[0025] Legend:

[0026] 1000. Equipment for measuring the flow capacity of aviation parts; 1. Photosensitive liquid level measuring device; 11. Mounting seat; 12. Laser transceiver module; 121. Laser transmitter; 122. Laser receiver; 13. Reflector; 14. Lifting mechanism; 141. Lifting seat; 1411. Guide sleeve; 142. Lifting nut; 143. Lifting bolt; 15. Fixing plate; 151. Adjusting hole; 16. Mounting plate; 161. Adjusting screw; 17. Fastening nut; 171. Driving unit; 2. Measuring pipe; 21. First measuring pipe; 22. Second measuring pipe; 3. Water tank; 4. Pumping device; 5. Water storage cylinder; 51. First water storage cylinder; 52. Second water storage cylinder; 6. Water guide cylinder; 7. Control pipe; 8. Control device; 81. Float; 82. Magnetic induction switch; 2000. Aviation parts. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0028] Please combine Figure 1 and Figure 2 The optical liquid level measuring device 1 provided in an embodiment of the present invention includes a mounting base 11, a laser transceiver module 12 and a reflective plate 13. The laser transceiver module 12 and the reflective plate 13 are both arranged on the mounting base 11. The mounting base 11 is used to be fixed to the measuring pipe 2. The laser transceiver module 12 and the reflective plate 13 are used to be arranged on opposite sides of the measuring pipe 2. The measuring pipe 2 is made of a quartz tube or other light-transmitting materials to ensure that the laser can pass through without causing refraction, reflection, etc. to the laser.

[0029] like Figure 3 As shown, the laser transceiver module 12 includes a laser emitter 121 and a laser receiver 122 arranged side by side in a vertical direction. The light emitting direction of the laser emitter 121 is toward the reflective plate 13 and is tilted downward relative to the horizontal plane. The laser receiver 122 is arranged below the laser emitter 121. The reflective plate 13 is used to reflect the laser emitted by the laser emitter 121 into the laser receiver 122.

[0030] Among them, the measuring pipe 2 at the position to be measured is a pipe that the laser can penetrate in a direction. The light-sensitive liquid level measuring device 1 emits the laser downwardly and obliquely relative to the measuring pipe 2 through the laser emitter 121, so that the laser passes through the liquid in the measuring pipe 2 and is reflected back to the laser receiver 122 by the reflector 13. Compared with the method of directly emitting the laser in the horizontal direction, when the liquid in the measuring pipe 2 reaches the preset height, the emitted laser will penetrate obliquely from the upper surface of the liquid surface into the liquid, making the laser more susceptible to changes in parameters such as the different refractive index and reflectivity of the air and water surface properties, so that it can be timely and accurately sensed by the laser receiver 122, and the time node when the liquid level reaches the preset height can be accurately measured.

[0031] Secondly, since the laser emitter 121 and the laser receiver 122 are arranged in the same module, the spacing and angle between the two can be precisely controlled and adjusted in advance, and are not affected by the structure and caliber of the measuring pipe 2 when installed on the measuring pipe 2. That is, there is no need to adjust the installation position and angle of the laser emitter 121 and the laser receiver 122 in turn according to the caliber of the measuring pipe 2. Only the position of the reflector 13 needs to be adjusted to achieve better measurement accuracy, effectively reducing the difficulty of measurement operation and ensuring measurement accuracy, so that the optical liquid level measuring device 1 can be better used in the flow capacity measurement equipment of aviation parts to measure the flow capacity of aviation parts with higher parameter requirements.

[0032] exist Figure 1 and Figure 2 As shown in the figure, the optical liquid level measuring device 1 also includes a lifting mechanism 14, and the laser transceiver module 12 and the reflector plate 13 are both arranged on the lifting mechanism 14. The lifting mechanism 14 is connected to the mounting seat 11 and can be lifted and lowered relative to the mounting seat 11, thereby driving the laser transceiver module 12 and the reflector plate 13 to lift and lower synchronously. While ensuring that the relative position between the laser transceiver module 12 and the reflector plate 13 remains unchanged, the laser transceiver module 12 and the reflector plate 13 are fine-tuned in the height direction at the same time to accurately adjust the liquid level trigger position of the optical liquid level measuring device 1 to facilitate accurate measurement.

[0033] Furthermore, the measuring pipe 2 is preset with a scale line for indicating the liquid level height, and the lifting mechanism 14 includes an adjustment window (not shown in the figure, the same below) for observing and aligning the scale line. The lifting mechanism 14 can be accurately raised and lowered to a preset position through the adjustment window, thereby further improving the measurement accuracy.

[0034] Furthermore, the lifting mechanism 14 includes a lifting seat 141, a lifting nut 142 and a lifting bolt 143. The laser transceiver module 12 and the reflector 13 are both installed on the lifting seat 141. The lifting seat 141 is arranged below the mounting seat 11. The lifting nut 142 is fixedly connected to the lifting seat 141. The mounting seat 11 is provided with a lifting hole. The lifting bolt 143 passes through the lifting hole along the top of the mounting seat 11 and is threadedly connected to the lifting nut 142. When in use, a wrench can be used to drive the lifting bolt 143 to rotate and drive the lifting nut 142 to move up and down, thereby driving the lifting seat 141 to move up and down, thereby realizing the lifting and lowering adjustment of the optical transceiver module 12 and the reflector 13. The lifting structure is simple, the connection strength is high, the stability is good, and the production cost can be reduced.

[0035] Furthermore, the lifting seat 141 also includes a guide sleeve 1411 for being mounted on the measuring pipe 2 and capable of rising and falling and sliding along the measuring pipe 2. The guide sleeve 1411 is composed of two semicircular groove clamps arranged on opposite sides of the measuring pipe 2 and spliced ​​together. The guide sleeve 1411 limits and guides the lifting movement of the lifting seat 141, thereby improving the lifting accuracy and stability of the lifting seat 141.

[0036] Preferably, the lifting mechanism 14 also includes a limiting structure (not shown in the figure, the same below) provided on the mounting seat 11 and used to limit the axial movement of the lifting bolt 143. The limiting structure can specifically be a slot structure that abuts or clamps on the top of the lifting bolt 143 and does not affect the rotation of the lifting bolt 143. The lifting bolt 143 is axially limited by the limiting structure to prevent the lifting bolt 143 from being directly lifted and moved to drive the lifting seat 141 as a whole to ensure the stability and position accuracy of the lifting seat 141.

[0037] like Figure 2As shown, the optical liquid level measuring device 1 also includes a fixing plate 15, a mounting plate 16 and a fastening nut 17. The fixing plate 15 is arranged on the lifting seat 141. The fixing plate 15 is provided with an adjusting hole 151. One side of the mounting plate 16 is used to install the reflecting plate 13, and the other side is provided with an adjusting screw 161 that passes through the adjusting hole 151. The mounting plate 16 can be rotated along the adjusting hole 151 through the adjusting screw 161, thereby driving the reflecting plate 13 to rotate. The fastening nut 17 is threadedly connected to the extending end of the adjusting screw 161 that passes through the adjusting hole 151 and extends outside the mounting plate 16, that is, the fastening nut 17 is provided on a side of the fixing plate 15 away from the mounting plate 16. The adjusting screw 161 can be tightened and fixed to the fixing plate 15 through the fastening nut 17, thereby realizing a fixed connection of the mounting plate 16 relative to the fixing plate 15.

[0038] Due to the influence of processing accuracy and flatness, the reflection effects at different positions on the surface of the reflection plate 13 may be different. In actual use, when the reflection effect of the reflection plate 13 is not good, after loosening the fastening nut 17, the reflection plate 13 can be slightly rotated along the axis of the adjusting screw 161 to change the position of the surface of the reflection plate 13 for reflecting laser light, thereby improving the reflection effect.

[0039] Preferably, the adjustment hole 151 is a waist-shaped hole extending in the vertical direction and used for the adjustment screw 161 to move up and down and slide, that is, after loosening the fastening nut 17, the adjustment screw 161 can move up and down along the waist-shaped hole, and independently realize the lifting and lowering movement of the reflector 13, thereby adjusting the installation height of the reflector 13 relative to the laser transceiver module 12, so that the reflector 13 can better adapt to the laser transceiver module 12.

[0040] Preferably, the fastening nut 17 is a butterfly nut, and a protruding driving portion 171 is provided on its opposite sides. The driving portion 171 is specifically a sheet-like structure extending in a direction away from the adjusting screw 161. The driving portion 171 makes it convenient for a person to directly screw the fastening nut 17 by hand, thereby improving the convenience of adjustment.

[0041] exist Figure 1 As shown in the figure, the optical liquid level measuring device 1 also includes a light shield 18. The laser transceiver module 12 and the reflector 13 are both arranged in the light shield 18. The light shield 18 shields external light to prevent external light from affecting the normal operation of the laser transceiver module 12.

[0042] Preferably, the inner wall of the light shield 18 is coated with dark paint to ensure the shielding effect of external light while avoiding reflection of internal light.

[0043] like Figure 4 As shown, according to a second aspect of the present invention, there is also provided an aviation part flow capacity measurement device 1000, comprising the aforementioned optical liquid level measurement device 1 and a measuring pipe 2. Furthermore, the aviation part flow capacity measurement device 1000 further comprises a water tank 3, a pumping device 4, a water storage cylinder 5, and a water guide cylinder 6. The water tank 3 is used to provide test liquid for the entire system. The pumping device 4 is used to pump liquid from the water tank 3 into the water storage cylinder 5. The bottom of the water storage cylinder 5 is provided with a measuring station for mounting an aviation part 2000. The top end of the water guide cylinder 6 is used to communicate with the aviation part 2000 on the measuring station, and the bottom end is connected to the water tank 3. A valve is provided within the water guide cylinder 6.

[0044] Specifically, the measuring pipe 2 is arranged in a vertical direction and its upper and lower ends are connected to the water storage cylinder 5, so that the liquid level height in the measuring pipe 2 remains the same as the liquid level height of the water storage cylinder 5. The optical liquid level measuring device 1 is arranged on the measuring pipe 2 and is used to detect the liquid level height of the measuring pipe 2 in real time, thereby detecting the liquid level height of the water storage cylinder 5 in real time.

[0045] Furthermore, at least two optical liquid level measuring devices 1 are provided, and the two optical liquid level measuring devices 1 are spaced apart in the vertical direction to respectively detect the time nodes when the liquid in the measuring pipe 2 reaches two heights.

[0046] The testing process of the aviation part flow capacity measuring device 1000 is as follows: first, close the valve in the water guide cylinder 6, and pump the test liquid in the water tank 3 into the water storage cylinder 5 through the pumping device 4, so that the liquid in the water storage cylinder 5 reaches a preset volume; then open the valve in the water guide cylinder 6, so that the test liquid in the water storage cylinder 5 flows back to the water tank 3 along the aviation part 2000. When the liquid in the water storage cylinder 5 drops to a first preset height, the time node t1 is recorded by one of the optical liquid level measuring devices 1. When the liquid in the water storage cylinder 5 drops to a second preset height, the time node t2 is recorded by another optical liquid level measuring device 1. Finally, the time node t1 is subtracted from the time node t2 to obtain the time required for a fixed amount of water to circulate through the aviation part 2000, and the flow capacity of the aviation part 2000 is accurately calculated.

[0047] Preferably, the water storage cylinder 5 includes a first water storage cylinder 51 with the measuring station provided at the bottom and a second water storage cylinder 52 connected to the top of the first water storage cylinder 51, the diameter of the second water storage cylinder 52 is larger than the diameter of the first water storage cylinder 51, the measuring pipe 2 includes a first measuring pipe 21 connected to the first water storage cylinder 51 and a second measuring pipe 22 connected to the second water storage cylinder 52, and the optical liquid level measuring device 1 includes a first optical liquid level measuring device provided on the first measuring pipe 21 and a second optical liquid level measuring device provided on the second measuring pipe 22.

[0048] When measuring aviation parts 2000 with a large flow capacity, the pumping device 4 can be used to pump test liquid until the first water reservoir 51 is filled, and then the second water reservoir 52 is filled. The larger diameter second water reservoir 52 is then used for testing, preventing the test liquid from running out too quickly and ensuring measurement effectiveness. When testing aviation parts 2000 with a smaller flow capacity, testing can be performed solely using the smaller diameter first water reservoir 51, improving measurement accuracy.

[0049] Furthermore, the capacity of the water tank 3 is 1.5 to 1.8 times the capacity of the water storage cylinder 5, so as to ensure that the water tank 3 can provide sufficient test liquid for the accessories in the entire measurement process and ensure the smooth operation of the measurement operation.

[0050] Furthermore, a temperature sensor and a pressure sensor are provided in the measuring pipe 2, and the temperature and pressure of the test liquid are detected in real time by the temperature sensor and the pressure sensor to determine whether they meet the measurement requirements, thereby ensuring the accuracy of the measurement results.

[0051] Please combine Figure 5 The aviation parts flow capacity measuring device 1000 also includes a control pipe 7 and a control device 8. The control pipe 7 is connected to the water storage cylinder 5 and maintains the same liquid level height as the water storage cylinder 5. The control device 8 is used to send a control signal according to the liquid level height in the control pipe 7.

[0052] Specifically, the control device 8 includes a float 81 disposed within the control pipe 7 and capable of floating on the liquid surface, and a magnetic induction switch 82 disposed outside the control pipe 7. When the float 81 reaches a preset height, it is sensed by the magnetic induction switch 82. This senses when the liquid level within the water tank 5 reaches the measurement start or end point, and controls the switch to start or stop the entire test operation. Because the control device 8 does not require high precision, it can reduce costs and provide greater reliability compared to structures using the optical liquid level measurement device 1 for control.

[0053] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A light-sensitive liquid level measuring device, characterized in that: The invention comprises a mounting base (11) for fixing to a measuring pipe (2), a laser transceiver module (12) and a reflector (13) arranged on the mounting base (11), wherein the laser transceiver module (12) and the reflector (13) are arranged on two opposite sides of the measuring pipe (2), the laser transceiver module (12) comprises a laser emitter (121) arranged with a light emitting direction tilted downward, and a laser receiver (122) arranged below the laser emitter (121), and the reflector (13) is adjustable in position relative to the mounting base (11) and is used to reflect laser light emitted by the laser emitter (121) to the laser receiver (122); The laser emitter (121) is used to emit laser light that obliquely penetrates the liquid from the upper surface of the liquid when the liquid in the measuring pipe (2) reaches a preset height, thereby causing the laser light to change due to the different refractive reflectivity of the air and the water surface.

2. The optical liquid level measuring device according to claim 1, characterized in that: The optical liquid level measuring device further comprises a fixing plate (15), a mounting plate (16) and a fastening nut (17); the fixing plate (15) is connected to the mounting seat (11); an adjusting hole (151) is provided on the fixing plate (15); an adjusting screw (161) is provided on the mounting plate (16) and is passed through the adjusting hole (151); the reflecting plate (13) is arranged on the mounting plate (15) and is rotatably arranged along the adjusting hole (151) through the adjusting screw (161); the fastening nut (17) is threadedly connected to the extending end of the adjusting screw (161) that passes through the adjusting hole (151) and extends outside the mounting plate (15).

3. The optical liquid level measuring device according to claim 2, characterized in that: The adjustment hole (151) is a waist-shaped hole extending in a vertical direction and used for the adjustment screw (161) to rise and fall and slide.

4. The optical liquid level measuring device according to claim 2, characterized in that: The fastening nut (17) is a butterfly nut.

5. The optical liquid level measuring device according to claim 1, characterized in that: The optical liquid level measuring device further comprises a lifting mechanism (14) connected to the mounting seat (11); the laser transceiver module (12) and the reflector plate (13) are both arranged on the lifting mechanism (14); and the lifting mechanism (14) is used to drive the laser transceiver module (12) and the reflector plate (13) to move upward and downward relative to the mounting seat (11).

6. The optical liquid level measuring device according to claim 5, characterized in that: The lifting mechanism (14) includes a lifting seat (141), a lifting nut (142) and a lifting bolt (143); the laser transceiver module (12) and the reflector (13) are both mounted on the lifting seat (141); the lifting seat (141) is arranged below the mounting seat (11); the lifting nut (142) is fixedly connected to the lifting seat (141); the mounting seat (11) is provided with a lifting hole; the lifting bolt (143) passes through the lifting hole along the top of the mounting seat (11) and is threadedly connected to the lifting nut (142).

7. The optical liquid level measuring device according to claim 6, characterized in that: The lifting seat (141) comprises a guide sleeve (1411) for being sleeved on the measuring pipe (2) and being arranged to be lifted and slidable along the measuring pipe (2).

8. The optical liquid level measuring device according to claim 1, characterized in that: The optical liquid level measuring device further comprises a light shield (18), and the laser transceiver module (12) and the reflective plate (13) are both arranged in the light shield (18).

9. An apparatus for measuring the flow capacity of aviation parts, comprising a water storage cylinder (5) and a measuring station provided at the bottom of the water storage cylinder (5) for mounting an aviation part (2000), a measuring pipe (2) communicating with the water storage cylinder (5) and maintaining the same liquid level as the water storage cylinder (5), and a liquid level measuring device provided on the measuring pipe (2) for sending a signal when the liquid level in the measuring pipe (2) reaches a preset height position, characterized in that: The liquid level measuring device is the optical liquid level measuring device according to any one of claims 1 to 8.

10. The aviation parts flow capacity measuring device according to claim 9, characterized in that: The water storage cylinder (5) comprises a first water storage cylinder (51) having the measuring station provided at the bottom thereof and a second water storage cylinder (52) connected to the top end of the first water storage cylinder (51); the caliber of the second water storage cylinder (52) is larger than the caliber of the first water storage cylinder (51); the measuring pipe (2) comprises a first measuring pipe (21) connected to the first water storage cylinder (51) and a second measuring pipe (22) connected to the second water storage cylinder (52); and the optical liquid level measuring device comprises a first optical liquid level measuring device provided on the first measuring pipe (21) and a second optical liquid level measuring device provided on the second measuring pipe (22).

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