Solid-state pneumatic angle probe

Abstract

The invention relates to the technical field of aeronautical instruments, and discloses a solid-state pneumatic angle probe which adopts a fixed cone as a cone sensing part, eight pressure measuring grooves are formed in the circumferential direction of the cone, and the pressure measuring grooves are uniformly distributed at an angle of 45 degrees. During use, one pressure measuring groove faces the incoming flow direction, so that the central axis of the conical sensing part is perpendicular to the incoming flow direction; when the pneumatic angle changes, the pressure values of the pressure measuring grooves symmetrical with the pressure measuring grooves as the symmetry axis change, the pneumatic angle value can be reversely deduced through the pressure difference of the symmetrical grooves, no rotating mechanism is needed, and the reliability is high.

Description

Technical Field

[0001] The invention relates to the technical field of aviation instruments and discloses a solid-state pneumatic angle probe. Background Art

[0002] During the flight, the flight attitude of the aircraft needs to be monitored in real time. The angle of attack sensor is an important measurement device for measuring the changes in the flight angle of attack of the aircraft. The commonly used angle of attack sensor is the rotating wind vane angle of attack sensor, which uses the clamping effect of high-speed airflow on the wind vane to make the wind vane always align with the incoming wind direction, thereby measuring the angle of attack. However, due to the existence of a rotating mechanism inside it, its reliability is relatively low. Summary of the invention

[0003] The object of the present invention is to provide a solid-state pneumatic angle probe, which can calculate the pneumatic angle through the pressure difference between pressure measuring grooves, does not require any rotating mechanism, and has high reliability.

[0004] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0005] A solid-state pneumatic angle probe comprises a conical body sensing part, wherein pressure measuring grooves are provided on the conical surface of the conical body sensing part, wherein the number of the pressure measuring grooves is 8, and each of the pressure measuring grooves is provided on the conical surface along the direction of the corresponding conical body generatrix; the 8 pressure measuring grooves are evenly distributed in the circumferential direction of the conical body sensing part, and each of the pressure measuring grooves is provided with an air path connected to a pressure sensor.

[0006] Furthermore, the cone top of the cone-shaped body sensing portion is a spherical structure, and the spherical structure is tangent to the cone surface of the cone-shaped body sensing portion.

[0007] Furthermore, the position of the cone-shaped body sensing portion close to the cone top is a turbulent flow zone, and the pressure measuring groove is arranged at a position on the cone surface away from the turbulent flow zone at the cone top.

[0008] Furthermore, one of the eight pressure measuring grooves faces the incoming flow direction, and the remaining pressure measuring grooves are spatially symmetrically distributed with the central axis of the pressure measuring groove facing the incoming flow direction as the symmetry axis.

[0009] Furthermore, the distances from the three pressure measuring grooves facing away from the incoming flow direction to the top of the cone are greater than the distances from the five pressure measuring grooves facing the incoming flow direction to the top of the cone.

[0010] Furthermore, it also includes a solving component, which includes a pressure sensor and a solving circuit. The pressure sensor is used to communicate with the corresponding air path, and the solving circuit is used to receive a pressure signal collected by the pressure sensor and solve the angle of attack according to the pressure signal.

[0011] Furthermore, it also includes a pressure self-test sensor, which is arranged together with the eight pressure sensors in the form of a silicon piezoresistive sensor array, and is used for the eight pressure sensors to perform self-test based on the pressure self-test sensor when the solid-state pneumatic angle probe is in a working state.

[0012] Furthermore, the interior of the conical sensing part is a hollow structure, and a heating wire is installed on the inner surface of the conical sensing part.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts a fixed cone as the cone sensing part, and a total of 8 pressure measuring grooves are opened in the circumferential direction of the cone, and the pressure measuring grooves are evenly distributed at 45 degrees. When in use, one of the pressure measuring grooves is directed toward the incoming flow direction, so that the central axis of the cone sensing part is perpendicular to the incoming flow direction; when the pneumatic angle changes, the pressure values ​​of the pressure measuring grooves symmetrical with the pressure measuring groove as the symmetry axis change, and the pneumatic angle value can be reversed by the pressure difference of the symmetrical grooves, without any rotating mechanism, and with high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the structure of the solid-state pneumatic angle probe in Example 1 or 2;

[0015] Figure 2 is a stereogram of the solid-state pneumatic angle probe in Example 1 or 2;

[0016] Figure 3 This is a schematic diagram of the internal structure of the solid-state pneumatic angle probe in Example 2;

[0017] Figure 4 This is a schematic diagram of the distribution of the pressure measuring grooves on the cone-shaped sensing part in Example 2;

[0018] Among them, 1. cone-shaped sensing part; 101. pressure measuring tank; 102. gas path; 2. resolution component; 201. pressure sensor; 202. resolution circuit; 203. pressure self-test sensor; 3. heating wire; 4. glass adapter. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the embodiments and drawings. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0020] Example 1

[0021] See also Figure 1 and Figure 2A solid-state pneumatic angle probe comprises a conical sensing portion 1, wherein a pressure measuring groove 101 is provided on the conical surface of the conical sensing portion 1, wherein the number of the pressure measuring grooves 101 is 8, and each of the pressure measuring grooves 101 is provided on the conical surface along the direction of the corresponding conical generatrix; the 8 pressure measuring grooves 101 are evenly distributed in the circumferential direction of the conical sensing portion 1, and each of the pressure measuring grooves 101 is provided with an air path 102 connected to a pressure sensor 201.

[0022] In this embodiment, a fixed cone is used as the cone sensing part 1, and a total of 8 pressure measuring grooves 101 are provided in the circumferential direction of the cone, and the pressure measuring grooves 101 are evenly distributed at 45 degrees. When in use, one of the pressure measuring grooves 101 is directed toward the incoming flow direction, so that the central axis of the cone sensing part 1 is perpendicular to the incoming flow direction; when the pneumatic angle changes, the pressure values ​​of the pressure measuring grooves 101 symmetrical with the pressure measuring groove 101 as the symmetry axis change, and the pneumatic angle value can be reversed by the pressure difference of the symmetrical grooves, without any rotating mechanism, and with high reliability.

[0023] In this embodiment, the cone top of the conical sensing part 1 is a spherical structure, and the spherical structure is tangent to the conical surface of the conical sensing part 1, which can reduce the disturbance of the flow of the conical sensing part 1 and improve the measurement accuracy of the aerodynamic angle.

[0024] According to aerodynamic simulation calculation, a certain area away from the cone top is the top turbulence area, where the pressure is unstable and there is turbulence, which is not conducive to pressure measurement. To further improve the pressure measurement accuracy, the pressure measuring groove 101 is set at a conical surface position away from the cone top turbulence area in this embodiment.

[0025] Example 2

[0026] See also Figure 1-Figure 4 A solid-state pneumatic angle probe comprises a conical sensing part 1 and a solving part 2; a pressure measuring groove 101 is provided on the conical surface of the conical sensing part 1, and the number of the pressure measuring grooves 101 is 8 (such as Figure 41#, 2#, 3#, 4#, 5#, 6#, 7#, 8#), each of the pressure measuring grooves 101 is respectively opened on the cone surface along the corresponding cone generatrix direction; the 8 pressure measuring grooves 101 are evenly distributed in the circumference of the cone sensing part 1, and each of the pressure measuring grooves 101 is respectively provided with an air path 102 connected to the pressure sensor 201. Among the 8 pressure measuring grooves 101, the 1# pressure measuring groove 101 is facing the incoming flow direction, and the other pressure measuring grooves 101 are spatially symmetrically distributed with the central axis of the pressure measuring groove 101 facing the incoming flow direction as the symmetry axis. The distance from the 3 pressure measuring grooves 101 (6#, 7#, 8#) away from the incoming flow direction to the top of the cone is greater than the distance from the 5 pressure measuring grooves 101 (1#, 2#, 3#, 4#, 5#) facing the incoming flow direction to the top of the cone. The solving component 2 includes a pressure sensor 201 and a solving circuit 202. The pressure sensor 201 is used to communicate with the corresponding gas path 102. The solving circuit 202 is used to receive the pressure signal collected by the pressure sensor 201 and solve the angle of attack according to the pressure signal.

[0027] In this embodiment, the cone sensing part 1 is used to sense the pressure value on the cone surface and output the pressure value to the pressure sensor 201 in the solver component. At the same time, the cone sensing part 1 has a built-in electric heater to realize the ice protection function of the product. The solver component 2 includes a pressure sensor 201 and a solver circuit 202. The pressure sensor 201 is used to convert the air pressure signal output by the cone sensing part 1 into an electrical signal. The solver circuit 202 is used to receive the electrical signal and output it according to the local angle of attack.

[0028] The area within a certain distance from the top of the cone is the top turbulence area. In this area, the pressure is unstable and there is turbulence, which is not conducive to pressure measurement. The range of this area is related to the spherical radius and cone angle of the cone top. The cone angle of the cone sensing part 1 in this embodiment is 13°. The cone top is spherical, tangent to the cone surface, and the sphere radius is SR4.5mm. The cone height (from the spherical cone top to the upper surface of the mounting flange) is 105mm. According to the simulation results, the turbulence area is within 30mm from the top of the cone, so the pressure measuring groove 101 on the windward side of the product is 35mm away from the top of the cone to avoid the adverse effects of the top turbulence area on the pressure measurement.

[0029] In this embodiment, the hypotenuse generatrix length of the cone-shaped body sensing part 1 is 15 mm, the width of the pressure measuring groove 101 is 1 mm, and it is opened in the normal direction, and the long side of the pressure measuring groove 101 is consistent with the direction of the cone generatrix. In the circumferential direction of the cone, the angles between the pressure measuring grooves 101 are evenly distributed, which is 45°, so a total of 8 pressure measuring grooves 101 are opened. Among the 8 pressure measuring grooves 101, the 5 pressure measuring grooves 101 (1#, 2#, 3#, 4#, 5#) on the windward side are closer to the top of the cone, and the 3 pressure measuring grooves 101 (6#, 7#, 8#) on the leeward side are farther from the top of the cone. The axial spacing between the pressure measuring grooves 101 on the windward side and the leeward side is 5 mm. When the aerodynamic angle is 0°, the middle pressure measuring slot 101 of the five pressure measuring slots 101 on the windward side should face the incoming flow, and the other pressure measuring slots 101 of the cone body are symmetrical along the center line of the pressure measuring slot 101, so under normal conditions, the pressure values ​​measured by the two mutually symmetrical pressure measuring slots 101 are consistent. When the aerodynamic angle changes, the pressure values ​​of the pressure measuring slots 101 symmetrical with the pressure measuring slot 101 as the symmetry axis change, and the aerodynamic angle value can be inferred by the pressure difference of the symmetrical slots.

[0030] In this embodiment, the air paths 102 inside the cone sensing part 1 are 8 independent and mutually airtight air paths 102. To avoid delay of the pressure signal and to have a certain capacity to accommodate foreign objects, the minimum diameter area of ​​the air path 102 is 7.065 mm2 (equivalent to a Φ3 mm cross-sectional area).

[0031] The product's icing protection uses armored heating wire 3 as a heating element. The heater has an operating voltage of 115V, is wound in a double-wire system, and is tightly fitted inside the cone through silver brazing. The heater adapter uses a miniaturized glass adapter 4, which is transferred to the inside of the solver 2.

[0032] The solution component 2 is composed of a pressure sensor 201 and a solution circuit 202; the pressure cone gas circuit 102 transmits the measured pressure signals of each channel to the pressure sensor 201, and the pressure sensor 201 converts the pressure signal into an electrical signal and transmits it to the solution circuit 202, thereby solving the angle of attack. The pressure sensor 201 is arranged in the form of a silicon piezoresistive sensor array, and a high-precision silicon piezoresistive sensor is used as a self-test reference when the product starts working, that is, the pressure self-test sensor 203, and the other eight are conventional silicon piezoresistive sensors connected to the product gas circuit 102. When the product starts, the eight conventional silicon piezoresistive sensors perform self-tests with the high-precision silicon piezoresistive sensor as the reference.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A solid-state pneumatic angle probe, characterized in that: The invention comprises a conical body sensing part (1), wherein a pressure measuring groove (101) is provided on the conical surface of the conical body sensing part (1), the number of the pressure measuring grooves (101) is 8, and each of the pressure measuring grooves (101) is provided on the conical surface along the direction of the corresponding conical body generatrix; the 8 pressure measuring grooves (101) are evenly distributed in the circumferential direction of the conical body sensing part (1), and each of the pressure measuring grooves (101) is provided with an air path (102) connected to a pressure sensor (201).

2. The solid-state pneumatic angle probe according to claim 1, characterized in that: The cone top of the cone-shaped sensing portion (1) is a spherical structure, and the spherical structure is tangent to the cone surface of the cone-shaped sensing portion (1).

3. The solid-state pneumatic angle probe according to claim 1, characterized in that: The position of the cone-shaped body sensing portion (1) close to the cone top is a disturbance zone, and the pressure measuring groove (101) is arranged at a position on the cone surface away from the cone top disturbance zone.

4. The solid-state pneumatic angle probe according to claim 1, characterized in that: One of the eight pressure measuring grooves (101) faces the incoming flow direction, and the remaining pressure measuring grooves (101) are spatially symmetrically distributed with the central axis of the pressure measuring groove (101) facing the incoming flow direction as the symmetry axis.

5. The solid-state pneumatic angle probe according to claim 4, characterized in that: The distance from the three pressure measuring grooves (101) facing away from the incoming flow direction to the cone top is greater than the distance from the five pressure measuring grooves (101) facing the incoming flow direction to the cone top.

6. The solid-state pneumatic angle probe according to claim 4, characterized in that: The invention also comprises a solving component (2), wherein the solving component (2) comprises a pressure sensor (201) and a solving circuit (202), wherein the pressure sensor (201) is used to communicate with the corresponding gas path (102), and the solving circuit (202) is used to receive a pressure signal collected by the pressure sensor (201) and solve the angle of attack according to the pressure signal.

7. The solid-state pneumatic angle probe according to claim 6, characterized in that: It also comprises a pressure self-test sensor (203), wherein the pressure self-test sensor (203) and the eight pressure sensors (201) are arranged in the form of a silicon piezoresistive sensor array, and is used for the eight pressure sensors (201) to perform self-test based on the pressure self-test sensor (203) when the solid-state pneumatic angle probe is in a working state.

8. The solid-state pneumatic angle probe according to any one of claims 1 to 7, characterized in that: The interior of the conical sensing portion (1) is a hollow structure, and a heating wire (3) is installed on the inner surface of the conical sensing portion (1).

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