Unmanned aerial vehicle aeroengine rotating speed sensor

Abstract

The utility model belongs to the technical field of fuel aero-engines, and particularly relates to an unmanned aerial vehicle aero-engine rotating speed sensor which comprises an engine shell, a signal wheel is arranged on the periphery of a crankshaft in a sleeved mode, multiple sets of first plate grooves are formed in the crankshaft, and clamping grooves are symmetrically formed in the inner walls of the first plate grooves. Multiple sets of second plate grooves are formed in the signal wheel, moving plates are assembled in the second plate grooves, first springs are installed between the moving plates and the inner walls of the second plate grooves, moving rods are assembled in the rod grooves, second springs are installed between the inner walls of the rod grooves and the side walls of the moving rods, and the moving rods are clamped in the clamping grooves; the positioning of the moving plate is realized, the fixed connection of the signal wheel and the crankshaft is realized, the signal wheel is clamped, the stability of the signal wheel can still be ensured after the signal wheel is used for a long time, the deviation between the signal wheel and the crankshaft is avoided, the speed measurement accuracy is ensured, and the stability of the signal wheel is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel aviation engines, in particular to a rotation speed sensor for an aircraft engine of a drone. Background Art

[0002] A fuel aircraft engine is a device that provides power for aircraft. It includes the aircraft engine and the systems and accessories necessary to ensure its normal operation, such as the fuel system, lubricating oil system, ignition system, starting system, and fire protection system. During the operation of a fuel aircraft engine, a speed sensor is required to measure the engine speed.

[0003] The structure of a speed sensor includes the sensing element: The key component of a speed sensor is the sensing element used to detect rotational motion. Common sensing elements include Hall effect sensors, photoelectric sensors, and magnetic sensors. The signal processing circuit: The signal obtained by the sensor through the sensing element needs to be amplified, filtered, and processed by the signal processing circuit to ensure signal stability and accuracy. The output interface: The speed sensor typically outputs the measured speed signal to a control system or data acquisition device for speed control and monitoring.

[0004] When measuring the speed of a fuel aircraft engine, the existing speed sensor usually fixes the signal wheel inside the speed sensor directly to the crankshaft with screws. However, after the crankshaft has been working for a long time, the screws are easily loosened due to the influence of rotational centrifugation, resulting in poor stability of the signal wheel and affecting the accuracy of speed measurement. Therefore, a UAV aircraft engine speed sensor is proposed to address the above problems. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art and solve the problems existing in the prior art, the utility model proposes a UAV aero-engine speed sensor.

[0006] The technical solution adopted by the utility model to solve its technical problems is a UAV aircraft engine speed sensor, comprising an engine casing, a fixing frame is installed on the inner wall of the engine casing, a crankshaft is rotatably installed on the inner wall of the fixing frame through a bearing, a signal generator is fixedly installed on the inner wall of the engine casing, a light emitting diode and a photosensitive diode are installed on the signal generator, a signal wheel is provided on the outer periphery of the crankshaft, a plurality of blades are installed on the signal wheel, a plurality of stripes are provided on the signal wheel, a plurality of groups of first plate grooves are provided on the crankshaft, a card groove is symmetrically provided on the inner wall of the first plate groove, a plurality of groups of second plate grooves are provided inside the signal wheel, a movable plate is assembled in the second plate groove, a first spring is installed between the movable plate and the inner wall of the second plate groove, two groups of rod grooves are symmetrically provided in the movable plate, a movable rod is assembled in the rod groove, a second spring is installed between the inner wall of the rod groove and the side wall of the movable rod, and the blades are provided with 6 0, 60 stripes are provided, the angle between two adjacent groups of stripes is 6°, and one stripe is provided between every two adjacent blades. Six groups of first plate slots are provided, and the angle between two adjacent groups of first plate slots is 60°. Six groups of movable plates are provided, and the angle between two adjacent groups of movable plates is 60°. A first rod hole and a second rod hole are provided on the movable plate, and a third rod hole is provided on the signal wheel. A thread is provided on the inner wall of the third rod hole, and a screw rod passes through the third rod hole, and the screw rod slides in cooperation with the third rod hole through the thread. A knob is installed on the screw, and the positioning of the movable plate is realized by clamping the movable rod in the slot. The positioning of the movable plate realizes the fixed connection between the signal wheel and the crankshaft. This structure can ensure the stability of the signal wheel after long-term use by clamping the signal wheel. There is no deviation between the signal wheel and the crankshaft, which ensures the accuracy of speed measurement and is beneficial to improving the stability of the signal wheel.

[0007] Preferably, an intake cone is installed on the front side of the crankshaft, a fan disk is provided on the fixed sleeve of the crankshaft, a compressor is provided on the fixed sleeve of the crankshaft, and a high-pressure turbine is provided on the fixed sleeve of the crankshaft. When the signal wheel rotates one circle, the signal generator outputs a voltage pulse signal equal to the number of blades to the ECU. The ECU can calculate the engine speed based on the relationship between the number of output signals, the period and the engine speed, which is beneficial to improving the accuracy of the speed measurement.

[0008] The utility model is beneficial in that:

[0009] 1. The utility model realizes the positioning of the movable plate by clamping the movable rod in the clamping slot. The positioning of the movable plate realizes the fixed connection between the signal wheel and the crankshaft. This structure can ensure the stability of the signal wheel after long-term use by clamping the signal wheel, and there will be no deviation between the signal wheel and the crankshaft, thereby ensuring the accuracy of speed measurement and improving the stability of the signal wheel.

[0010] 2. In this utility model, the signal generator outputs a voltage pulse signal equal to the number of blades to the ECU when the signal wheel rotates one circle. The ECU can calculate the engine speed based on the relationship between the number and period of the output signal and the engine speed, which is beneficial to improving the accuracy of speed measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 It is a schematic diagram of a first-person perspective three-dimensional structure;

[0013] Figure 2 It is a schematic diagram of the three-dimensional structure of the signal generator;

[0014] Figure 3 Schematic diagram of the internal three-dimensional structure of the second plate slot;

[0015] Figure 4 This is a schematic diagram of the internal three-dimensional structure of the signal wheel;

[0016] Figure 5 It is a schematic diagram of the internal three-dimensional structure of the engine casing.

[0017] In the figure: 1. Engine casing; 2. Fixing frame; 3. Crankshaft; 4. Signal generator; 5. Light-emitting diode; 6. Photosensitive diode; 7. Signal wheel; 8. Blade; 9. Stripe; 10. First plate slot; 11. Card slot; 12. Second plate slot; 13. Moving plate; 14. First spring; 15. Rod slot; 16. Moving rod; 17. Second spring; 18. First rod hole; 19. Screw; 20. Knob; 21. Inlet cone; 22. Fan disk; 23. Compressor; 24. High-pressure turbine. DETAILED DESCRIPTION

[0018] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-5As shown, a UAV engine speed sensor includes an engine housing 1, a fixing frame 2 is installed on the inner wall of the engine housing 1, a crankshaft 3 is rotatably installed on the inner wall of the fixing frame 2 through a bearing, a signal generator 4 is fixedly installed on the inner wall of the engine housing 1, a light-emitting diode 5 and a photosensitive diode 6 are installed on the signal generator 4, a signal wheel 7 is sleeved on the outer periphery of the crankshaft 3, a plurality of blades 8 are installed on the signal wheel 7, a plurality of stripes 9 are provided on the signal wheel 7, a plurality of groups of first plate grooves 10 are provided on the crankshaft 3, a card slot 11 is symmetrically provided on the inner wall of the first plate groove 10, a plurality of groups of second plate grooves 12 are provided inside the signal wheel 7, a movable plate 13 is assembled in the second plate groove 12, and the movable plate 13 and the second plate groove 12 are provided with a plurality of stripes 9. A first spring 14 is installed between the walls, two groups of rod grooves 15 are symmetrically opened in the movable plate 13, and a movable rod 16 is assembled in the rod groove 15. A second spring 17 is installed between the inner wall of the rod groove 15 and the side wall of the movable rod 16. There are 60 blades 8, 60 stripes 9, and the angle between two adjacent groups of stripes 9 is 6°. There is a stripe 9 between each two adjacent blades 8. There are six groups of first plate grooves 10, and the angle between two adjacent groups of first plate grooves 10 is 60°. There are six groups of movable plates 13, and the angle between two adjacent groups of movable plates 13 is 60°. A first rod hole 18 and a second rod hole 25 are opened on the movable plate 13. A third rod hole is opened on the signal wheel 7, and the inner wall of the third rod hole is provided with a A thread is provided, and a screw 19 passes through the third rod hole, and the screw 19 slides in cooperation with the third rod hole through the thread, and a knob 20 is installed on the screw 19, and an intake cone 21 is installed on the front side of the crankshaft 3, a fan disk 22 is fixed on the crankshaft 3, a compressor 23 is fixed on the crankshaft 3, and a high-pressure turbine 24 is fixed on the crankshaft 3; when working, in the process of measuring the speed of a fuel aircraft engine, the existing speed sensor has a signal wheel 7 in the speed sensor that is usually fixed directly to the crankshaft 3 by screws. However, after the crankshaft 3 has been working for a long time, the screws are easily affected by the centrifugal rotation and become loose, resulting in poor stability of the signal wheel 7, which affects the accuracy of speed measurement. During aircraft engine speed measurement, the crankshaft 3 rotates at high speed through the operation of the fuel-powered aircraft engine, driving the signal wheel 7 to rotate at high speed. When the signal wheel 7 rotates, the light-emitting diode 5 of the signal generator 4 emits light that shines on the stripes 9. The photosensitive diode 6 receives the reflected light and converts the received light signal into an electrical pulse signal through the detection circuit. Whenever the blade 8 blocks the light beam, the voltage of the photosensitive diode 6 is zero. The photosensitive diode 6 generates a voltage due to light sensitivity. When the signal wheel 7 rotates one circle, the signal generator 4 outputs a voltage pulse signal equal to the number of blades 8 to the ECU. The ECU can calculate the engine speed based on the relationship between the number of output signals, the period, and the engine speed.

[0020] During the installation of the signal wheel 7, the signal wheel 7 is sleeved on the crankshaft 3. At this time, a screw 19 is inserted on the signal wheel 7. The screw 19 is inserted into the first rod hole 18 of the movable plate 13 and the third rod hole of the signal wheel 7 to fix the position of the movable plate 13. By unscrewing the screw 19 from the first rod hole 18 of the movable plate 13 and the third rod hole of the signal wheel 7, the screw 19 no longer limits the movable plate 13. Under the action of the first spring 14, the first spring 14 pushes the movable plate 13 to slide into the first plate groove 10 of the crankshaft 3. After one end of the movable plate 13 is inserted into the first plate groove 10 of the crankshaft 3, the movable rod 16 on the movable plate 13 is pushed by the second spring 17. One end of the movable rod 16 It slides into the slot 11 of the crankshaft 3, and the moving rod 16 is stuck in the slot 11, thereby realizing the positioning of the moving plate 13. The positioning of the moving plate 13 realizes the fixed connection between the signal wheel 7 and the crankshaft 3. Finally, the screw 19 is screwed into the third rod hole of the signal wheel 7, and the second rod hole 25 on the moving plate 13 is aligned with the third rod hole. The screw 19 passes through the third rod hole and the second rod hole 25, thereby realizing the secondary positioning of the moving plate 13 and strengthening the fixed connection between the signal wheel 7 and the crankshaft 3. This structure can ensure the stability of the signal wheel 7 after long-term use by clamping the signal wheel 7, and there will be no deviation between the signal wheel 7 and the crankshaft 3, thereby ensuring the accuracy of speed measurement and helping to improve the stability of the signal wheel 7.

[0021] Working principle: In the process of measuring the speed of a fuel aircraft engine, the existing speed sensor usually fixes the signal wheel 7 in the speed sensor directly to the crankshaft 3 with screws. However, after the crankshaft 3 has been working for a long time, the screws are easily loosened due to the influence of rotational centrifugation, resulting in poor stability of the signal wheel 7, affecting the accuracy of speed measurement. In the process of measuring the speed of a fuel aircraft engine, the crankshaft 3 rotates at a high speed due to the operation of the fuel aircraft engine, and the crankshaft 3 drives the signal wheel 7 to rotate at a high speed. When the signal wheel 7 rotates, the light emitting diode 5 of the signal generator 4 emits light to illuminate the stripes 9. The photosensitive diode 6 receives the reflected light and converts the received light signal into an electrical pulse signal through the detection circuit. Whenever the blade 8 blocks the light beam, the voltage of the photosensitive diode 6 is zero. The photosensitive diode 6 generates a voltage due to light sensitivity. When the signal wheel 7 rotates one circle, the signal generator 4 outputs a voltage pulse signal equal to the number of blades 8 to the ECU. The ECU can calculate the engine speed based on the relationship between the number of output signals, the period and the engine speed. In the process of installing the signal wheel 7, the signal wheel 7 is put on the crankshaft 3. At this time, a screw 19 is inserted on the signal wheel 7, and the screw 19 is inserted on the movable plate 13. The position of the movable plate 13 is fixed in the first rod hole 18 of the movable plate 13 and the third rod hole of the signal wheel 7. By unscrewing the screw 19 from the first rod hole 18 of the movable plate 13 and the third rod hole of the signal wheel 7, the screw 19 no longer limits the movable plate 13. Under the action of the first spring 14, the first spring 14 pushes the movable plate 13 to slide into the first plate groove 10 of the crankshaft 3. After one end of the movable plate 13 is inserted into the first plate groove 10 of the crankshaft 3, the movable rod 16 on the movable plate 13 is pushed by the second spring 17. One end of the movable rod 16 slides into the slot 11 of the crankshaft 3, and the movable rod 16 is stuck in the slot 11, realizing The positioning of the movable plate 13 and the positioning of the movable plate 13 realize the fixed connection between the signal wheel 7 and the crankshaft 3. Finally, the screw 19 is screwed into the third rod hole of the signal wheel 7, and the second rod hole 25 on the movable plate 13 is aligned with the third rod hole. The screw 19 passes through the third rod hole and the second rod hole 25, realizing the secondary positioning of the movable plate 13 and strengthening the fixed connection between the signal wheel 7 and the crankshaft 3. This structure can ensure the stability of the signal wheel 7 after long-term use by clamping the signal wheel 7, and there will be no deviation between the signal wheel 7 and the crankshaft 3, thereby ensuring the accuracy of speed measurement and helping to improve the stability of the signal wheel 7.

[0022] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. A UAV engine speed sensor, characterized by: The invention comprises an engine housing (1), a fixing frame (2) is installed on the inner wall of the engine housing (1), a crankshaft (3) is rotatably installed on the inner wall of the fixing frame (2) via a bearing, a signal generator (4) is fixedly installed on the inner wall of the engine housing (1), a light emitting diode (5) and a photosensitive diode (6) are installed on the signal generator (4), a signal wheel (7) is sleeved on the outer periphery of the crankshaft (3), a plurality of blades (8) are installed on the signal wheel (7), a plurality of stripes (9) are provided on the signal wheel (7), and a plurality of groups of A first plate slot (10) is provided, wherein a card slot (11) is symmetrically provided on the inner wall of the first plate slot (10), a plurality of second plate slots (12) are provided inside the signal wheel (7), a movable plate (13) is installed in the second plate slot (12), a first spring (14) is installed between the movable plate (13) and the inner wall of the second plate slot (12), two groups of rod slots (15) are symmetrically provided in the movable plate (13), a movable rod (16) is installed in the rod slot (15), and a second spring (17) is installed between the inner wall of the rod slot (15) and the side wall of the movable rod (16).

2. The UAV engine speed sensor according to claim 1, characterized in that: There are 60 blades (8) and 60 stripes (9), the angle between two adjacent groups of stripes (9) is 6°, and one stripe (9) is provided between every two adjacent blades (8).

3. The UAV engine speed sensor according to claim 1, characterized in that: The first plate slots (10) are provided in six groups, and the angle between two adjacent groups of first plate slots (10) is 60°; the movable plates (13) are provided in six groups, and the angle between two adjacent groups of movable plates (13) is 60°.

4. The UAV engine speed sensor according to claim 3, characterized in that: The movable plate (13) is provided with a first rod hole (18) and a second rod hole (25), the signal wheel (7) is provided with a third rod hole, and the inner wall of the third rod hole is provided with a thread.

5. The UAV engine speed sensor according to claim 4, characterized in that: A screw rod (19) passes through the third rod hole. The screw rod (19) slides in cooperation with the third rod hole through a thread. A knob (20) is installed on the screw rod (19).

6. The UAV engine speed sensor according to claim 1, characterized in that: An intake cone (21) is installed on the front side of the crankshaft (3), a fan disk (22) is fixedly sleeved on the crankshaft (3), a compressor (23) is fixedly sleeved on the crankshaft (3), and a high-pressure turbine (24) is fixedly sleeved on the crankshaft (3).

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