A propeller blade angle measuring device

Abstract

The invention discloses a propeller blade angle measuring device, comprising: a reference angle measuring mechanism, a displacement angle measuring mechanism and a controller, the reference angle measuring mechanism comprising a reference wheel, a reference displacement assembly and a first sensor, the displacement angle measuring mechanism comprising a cam, a displacement sensing assembly and a second sensor, the reference wheel being mounted at the blade root of a first blade, the cam being mounted at the blade root of a second blade, the first blade and the second blade being symmetrically mounted on a hub, the second sensor having the same structure as the first sensor, both being fixed to an engine casing through a bracket; the displacement sensing assembly having the same structure as the reference displacement assembly, a contact being provided at one end thereof for rolling contact with an outer circumferential surface of the cam, and a sensing disk being provided at the other end thereof for corresponding to the second sensor; the invention can measure and timely feedback the blade angle at any time, has a simple structure, accurate measurement, and is convenient for installation and disassembly.

Description

Technical Field

[0001] The present invention relates to the field of measurement technology, and more particularly to a propeller blade angle measuring device. Background Art

[0002] The flight environment of an aircraft is very complex. In order to match the propeller with the aircraft engine at all times and achieve the best working efficiency of the propeller, the propeller must be able to work at the best blade angle. The working propeller blade angle is measured and collected, and the blade angle closed-loop control is achieved through the relationship between the blade angle, propeller speed, and engine power. The pitch of the propeller blade is measured and fed back in real time, thereby improving the performance of the propeller.

[0003] Therefore, how to provide a propeller blade angle measurement device is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The present invention provides a propeller blade angle measuring device, aiming to solve the above-mentioned technical problems in the prior art to a certain extent.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A propeller blade angle measuring device, comprising:

[0007] A reference angle measurement mechanism, the reference angle measurement mechanism comprising a reference wheel, a reference displacement assembly and a first sensor, the reference wheel being mounted at the blade root of the first blade, the first sensor being fixed to the engine housing through a bracket, one end of the reference displacement assembly being provided with a contact in rolling contact with the outer circumference of the reference wheel, and the other end being provided with an induction disk, the induction disk being a permanent magnet corresponding to the first sensor;

[0008] A displacement angle measuring mechanism, the displacement angle measuring mechanism comprising a cam, a displacement sensing assembly and a second sensor, the cam being mounted at the root of the second blade, the first blade and the second blade being symmetrically mounted on the hub, the second sensor having the same structure as the first sensor, and the second sensor being fixed to the engine housing through a bracket; the displacement sensing assembly having the same structure as the reference displacement assembly, a contact being provided at one end thereof for rolling contact with the outer circumferential surface of the cam, and the induction disk being provided at the other end thereof for corresponding to the second sensor;

[0009] A controller is electrically connected to the first sensor and the second sensor respectively.

[0010] Furthermore, the reference displacement assembly also includes a displacement rod, a support, a first linear motion ball bearing, a second linear motion ball bearing, a spring and a spring seat; a mounting plate and a fixing plate are respectively provided at the middle and rear ends of the outer wall of the support, and the support is fixed to the propeller shell through the mounting plate;

[0011] The displacement rod is movably arranged in the support, the contact is arranged at the front end of the displacement rod, the support is defined with a first cavity and a second cavity, the displacement rod located in the first cavity is installed with the first linear motion ball bearing, the spring is accommodated in the second cavity, and the spring is sleeved on the displacement rod, the rear end of the support is connected with a spring baffle, the inner side of the spring baffle is connected to the fixed disk, the middle part of the inner side of the spring baffle is fixedly connected to the spring seat, the displacement rod sequentially passes through the spring seat and the spring baffle, a third cavity is arranged in the spring seat, a second linear motion ball bearing is arranged in the third cavity, the second linear motion ball bearing is installed on the displacement rod, and one end of the displacement rod close to the spring baffle is fixedly connected to the center of the induction disk.

[0012] Furthermore, the front end of the contact is a conical structure, and a ball bearing is rotatably arranged inside the contact, and the ball bearing is in rolling contact with the outer circumferential surface of the cam or the reference wheel.

[0013] Furthermore, a connecting hole is opened in the middle part of the rear end of the contact, a positioning hole is provided on the outer wall of the connecting hole, the front end of the displacement rod is plugged into and adapted to the connecting hole, and a through hole corresponding to the positioning hole is provided on the displacement rod, and the displacement rod is fixedly connected to the contact by passing a pin shaft through the positioning hole and the through hole.

[0014] Furthermore, the induction disc is composed of titanium alloy and samarium-cobalt alloy, and the samarium-cobalt alloy is encapsulated in a titanium alloy shell.

[0015] Furthermore, the first sensor includes a shell and an AD conversion module, a DA conversion module, a signal processing module, and a Hall element located in the shell. The AD conversion module is connected to an amplification module, which is used to convert the magnetic induction voltage signal detected by the Hall element into a digital signal, amplify the output, and send it to the signal processing module. After processing, the signal processing module performs temperature compensation and linearization processing, and then outputs a voltage signal that is linearly related to the measured distance through the DA conversion module to the controller for angle resolution.

[0016] Furthermore, a limiting boss is provided in the cam, and the limiting boss cooperates with a limiting groove of the root of the second blade to prevent the cam from falling out and angularly rotating under the action of centrifugal force.

[0017] Furthermore, the cam rotates at an angle of 9° to 51°.

[0018] Furthermore, the linear distance between the sensing disk and the sensor is 0-20 mm.

[0019] Furthermore, the distance D1 between the sensing disk of the reference displacement assembly and the blade axis is 0.3 mm to 0.5 mm smaller than the distance D2 between the sensing disk of the displacement sensing assembly and the blade axis.

[0020] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a propeller blade angle measuring device. When the blade angle changes, the cam and the reference wheel rotate, the displacement sensing component converts the rotation of the cam into a linear displacement, and the second sensor senses the linear displacement and converts it into a voltage change signal to provide feedback on the blade angle.

[0021] The linear displacement of the reference displacement component against the reference wheel is 0, which is used as the reference of the displacement sensing component and serves as the reference for blade angle measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 It is a schematic structural diagram of the reference angle measurement mechanism of the present invention.

[0024] Figure 2 It is a structural schematic diagram of the displacement angle measuring mechanism of the present invention.

[0025] Figure 3 This is a schematic diagram of the installation of the displacement angle measurement mechanism.

[0026] Figure 4 It is a structural schematic diagram of a reference displacement component or a displacement sensing component.

[0027] in:

[0028] 10-spring baffle; 11-reference wheel; 12-first sensor; 13-contact; 14-sensing disk; 15-displacement rod; 16-support; 17-first linear motion ball bearing; 18-spring seat; 19-spring; 161-mounting disk; 162-fixed disk; 20-second blade; 21-cam; 22-second sensor; 30-hub; 31-engine housing. DETAILED DESCRIPTION

[0029] The following will be combined with the 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] The embodiment of the present invention discloses a propeller blade angle measuring device, comprising: a reference angle measuring mechanism, a displacement angle measuring mechanism and a controller, wherein the reference angle measuring mechanism comprises a reference wheel 11, a reference displacement assembly and a first sensor 12, the reference wheel 11 is installed at the blade root of the first blade, and in order to enhance the connection degree, a limiting boss is provided on the inner ring of the reference wheel 11, and the limiting boss cooperates with the limiting groove of the blade root to prevent the cam from coming out and rotating circumferentially under the action of centrifugal force; the first sensor 12 is fixed to the engine housing through a bracket, one end of the reference displacement assembly is provided with a contact 13 that rolls with the outer circumferential surface of the reference wheel 11, and the other end is provided with an induction disk 14, the induction disk 14 is a permanent magnet, and the induction disk 14 corresponds to the first sensor 12;

[0035] The displacement angle measuring mechanism includes a cam 21, a displacement sensing component and a second sensor 22. The cam 21 is installed at the root of the second blade 20. To enhance the connection, a limiting boss is provided inside the cam 21. The limiting boss cooperates with the limiting groove at the root of the second blade 20 to prevent the cam from falling out and rotating circumferentially under the action of centrifugal force.

[0036] The first blade and the second blade 20 are symmetrically mounted on the hub 30. The second sensor 22 has the same structure as the first sensor 12 and is fixed to the engine housing 31 through a bracket. The displacement sensing component has the same structure as the reference displacement component, with a contact 13 at one end that rolls in contact with the outer circumference of the cam 21, and a sensing disk 14 at the other end that corresponds to the second sensor 22. The controller is electrically connected to the first sensor 12 and the second sensor 22, respectively.

[0037] Advantageously, the cam and the reference wheel are respectively connected by two semicircular cams and two semicircular reference wheels, and a connecting boss with bolt holes is provided at the connection, which is clamped on the blade root of the blade and fixed together by bolts and nuts.

[0038] In this embodiment, the induction disc 14 is made of titanium alloy and samarium-cobalt alloy, and the samarium-cobalt alloy is encapsulated in a titanium alloy housing.

[0039] It should be noted that the linear distance between the sensing disk 14 and the first sensor 12 or the second sensor 22 is 0-20 mm. The structure of the reference displacement assembly is the same as that of the displacement sensing assembly, but the length of the displacement rod is different. The distance D1 between the sensing disk of the reference displacement assembly and the blade axis is 0.3 mm to 0.5 mm smaller than the distance D2 between the sensing disk of the displacement sensing assembly and the blade axis, ensuring that the two sensing disk signals collected by the two sensors do not overlap.

[0040] In one embodiment, the first sensor 12 includes a shell and an AD conversion module, a DA conversion module, a signal processing module, and a Hall element located in the shell. The AD conversion module is connected to an amplification module, which is used to convert the magnetic induction voltage signal detected by the Hall element into a digital signal, amplify the output, and send it to the signal processing module. After processing, the signal processing module performs temperature compensation and linearization processing, and then outputs a voltage signal that is linearly related to the measured distance through the DA conversion module to the controller for angle resolution.

[0041] In order to further optimize the above scheme, the effective measurement angle range of the pitch measuring device is 2° to 49°. Considering the smooth transition between the cam curve and the non-pitch measurement area, the rotation angle of the cam 21 is 9° to 51°.

[0042] Specifically, the reference displacement assembly also includes a displacement rod 15, a support 16, a first linear motion ball bearing 17, a second linear motion ball bearing, a spring 19 and a spring seat 18; a mounting plate 161 and a fixing plate 162 are respectively provided at the middle and rear ends of the outer wall of the support 16, and the support 16 is fixed to the propeller shell through the mounting plate 161; the displacement rod 15 is movably arranged in the support 16, and the contact 13 is arranged at the front end of the displacement rod 15; a first cavity and a second cavity are defined in the support 16, and a first linear motion ball bearing is installed on the displacement rod 15 located in the first cavity, The spring 19 is accommodated in the second cavity, and the spring 19 is sleeved on the displacement rod 15. The rear end of the support 16 is connected to the spring baffle 10, the inner side of the spring baffle 10 is connected to the fixed disk 162, the middle part of the inner side of the spring baffle 10 is fixedly connected to the spring seat 18, and the displacement rod 15 passes through the spring seat 18 and the spring baffle 10 in sequence. A third cavity is provided in the spring seat 18, and a second linear motion ball bearing is provided in the third cavity. The second linear motion ball bearing is installed on the displacement rod 15, and one end of the displacement rod 15 close to the spring baffle 10 is fixedly connected to the center of the induction disk 14.

[0043] Advantageously, the front end of the contact 13 is a conical structure, and a ball bearing is rotatably arranged inside the contact 13, and the ball bearing is in rolling contact with the outer circumference of the cam or the reference wheel to reduce the influence of friction. A connecting hole is opened in the middle of the rear end of the contact 13, and a positioning hole is arranged on the outer wall of the connecting hole. The front end of the displacement rod 15 is plugged and matched with the connecting hole, and a through hole corresponding to the positioning hole is arranged on the displacement rod 15. The displacement rod 15 is fixedly connected to the contact 13 by passing a pin through the positioning hole and the through hole.

[0044] The working principle of the present invention is as follows: the influence of external factors is eliminated in the process of measuring the propeller blade angle, blade angle measuring devices are installed on the two symmetrical blades of the propeller, one set is used as a reference, and the other set is used for measurement, the displacement sensing component cooperates with the cam to convert the change of the blade angle into the linear motion of the displacement sensing component, and then the change of the blade angle is measured by the second sensor; the reference displacement sensing component cooperates with the reference wheel as the reference of the displacement sensing component, and is used to eliminate the influence of factors such as the propeller shaft movement in the negative tension state and the deformation of the blade root in the flight state on the pitch measurement accuracy, the measuring devices of the two blades feed back the measured values ​​to the controller at the same time, and the controller realizes the blade angle pitch change accuracy control and measurement after comparison and correction.

[0045] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0046] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A propeller blade angle measuring device, characterized in that: include: A reference angle measurement mechanism, the reference angle measurement mechanism comprising a reference wheel (11), a reference displacement assembly and a first sensor (12), the reference wheel (11) being mounted at the blade root of a first blade, the first sensor (12) being fixed to an engine casing (31) via a bracket, one end of the reference displacement assembly being provided with a contact (13) in rolling contact with an outer circumferential surface of the reference wheel (11), and the other end being provided with an induction disk (14), the induction disk (14) being a permanent magnet corresponding to the first sensor (12); A displacement angle measuring mechanism, the displacement angle measuring mechanism comprising a cam (21), a displacement sensing component and a second sensor (22), the cam (21) being mounted at the blade root of a second blade (20), the first blade and the second blade (20) being symmetrically mounted on a hub (30), the second sensor (22) having the same structure as the first sensor (12), and the second sensor (22) being fixed to an engine housing (31) via a bracket; the displacement sensing component having the same structure as the reference displacement component, one end of which is provided with the contact (13) for rolling contact with the outer circumferential surface of the cam (21), and the other end of which is provided with the sensing disk (14) corresponding to the second sensor (22); A controller, the controller being electrically connected to the first sensor (12) and the second sensor (22) respectively; The reference displacement assembly further comprises a displacement rod (15), a support (16), a first linear motion ball bearing (17), a second linear motion ball bearing, a spring (19) and a spring seat (18); The middle and rear ends of the outer wall of the support (16) are respectively provided with a mounting plate (161) and a fixing plate (162); the support (16) is fixed to the propeller shell via the mounting plate (161); the displacement rod (15) is movably arranged in the support (16); the contact (13) is arranged at the front end of the displacement rod (15); a first cavity and a second cavity are defined in the support (16); the first linear motion ball bearing is installed on the displacement rod (15) located in the first cavity; the spring (19) is accommodated in the second cavity, and the spring (19) is sleeved on the displacement rod (15); The rear end of the support (16) is connected to a spring baffle (10), the inner side of the spring baffle (10) is connected to the fixed disk (162), the middle part of the inner side of the spring baffle (10) is fixedly connected to the spring seat (18), the displacement rod (15) passes through the spring seat (18) and the spring baffle (10) in sequence, a third cavity is provided in the spring seat (18), a second linear motion ball bearing is provided in the third cavity, the second linear motion ball bearing is mounted on the displacement rod (15), and one end of the displacement rod (15) close to the spring baffle (10) is fixedly connected to the center of the induction disk (14); The front end of the contact (13) is a conical structure, and a ball bearing is rotatably arranged inside the contact, and the ball bearing is in rolling contact with the outer circumferential surface of the cam or the reference wheel.

2. A propeller blade angle measuring device according to claim 1, characterized in that: A connecting hole is provided in the middle of the rear end of the contact (13), a positioning hole is provided on the outer wall of the connecting hole, the front end of the displacement rod (15) is plugged and matched with the connecting hole, and a through hole corresponding to the positioning hole is provided on the displacement rod (15), and a pin shaft passes through the positioning hole and the through hole to fix the displacement rod (15) and the contact (13).

3. A propeller blade angle measuring device according to claim 1, characterized in that: The first sensor (12) comprises a shell and an AD conversion module, a DA conversion module, a signal processing module and a Hall element located in the shell. The AD conversion module is connected to an amplification module for converting a magnetic induction voltage signal detected by the Hall element into a digital signal for amplification and output, and sending it to the signal processing module. After processing by the signal processing module, temperature compensation and linearization are performed, and then a voltage signal having a linear relationship with the measured distance is output through the DA conversion module to the controller for angle resolution.

4. A propeller blade angle measuring device according to claim 1, characterized in that: A limiting boss is arranged inside the cam (21), and the limiting boss cooperates with a limiting groove at the root of the second blade (20).

5. A propeller blade angle measuring device according to claim 1, characterized in that: The cam (21) rotates at an angle of 9° to 51°.

6. A propeller blade angle measuring device according to claim 1, characterized in that: The linear distance between the sensing disk (14) and the first sensor (12) or the second sensor (22) is 0-20 mm.

7. A propeller blade angle measuring device according to claim 1, characterized in that: The distance D1 between the sensing disk of the reference displacement component and the blade axis is 0.3 mm to 0.5 mm smaller than the distance D2 between the sensing disk of the displacement sensing component and the blade axis.

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