Vibration-resistant torque motor structure with position monitoring

Abstract

The application discloses a vibration-resistant torque motor structure with position monitoring and relates to the field of electro-hydraulic servo valves. The vibration-resistant torque motor structure can prevent the spring tube in the torque motor from being damaged due to the deflection of the armature by a large angle in a vibration environment, improve the reliability and service life of the servo valve, and monitor the motion state of the armature. The vibration-resistant torque motor structure with position monitoring comprises an armature assembly, a magnetic circuit assembly, a first limiting structure and a second limiting structure. By adjusting the limiting monitor in the limiting structure, the limiting of the translation and rotation of the armature in the armature assembly and the monitoring of the motion state of the armature are realized.

Description

Technical Field

[0001] This invention relates to the field of electro-hydraulic servo valve torque motor technology, and in particular to a vibration-resistant torque motor structure with position monitoring. Background Technology

[0002] Electro-hydraulic servo valves are widely used in aero engines to control fuel metering, guide vane control, and nozzle vector control. Aero engines are high-temperature and high-vibration operating components, and electro-hydraulic servo valves need to withstand acceleration vibration tests of about 100g before being applied to products.

[0003] As the electro-mechanical conversion device of electro-hydraulic servo valve, the performance of the torque motor directly affects the static and dynamic performance of the entire valve. In high-acceleration vibration environment, the Bourdon tube in the torque motor often breaks and is damaged due to the excessive deflection of the armature, which seriously affects the reliability and life of the servo valve. In addition, in traditional structural design, more consideration needs to be given to the compactness of the structure, and the space for installing displacement sensors is limited, making it difficult for external sensors to monitor its motion displacement. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a vibration-resistant torque motor structure with position monitoring. By installing a limit monitor on the upper magnet and the fixed plate, the excessive deflection of the armature is firstly limited to prevent damage to the elastic element, the Bourdon tube, thereby improving the reliability and lifespan of the torque motor. Secondly, the movement state of the armature is monitored to obtain the armature's posture in space.

[0005] To achieve the above objectives, the vibration-resistant torque motor structure with position monitoring provided by the present invention adopts the following technical solution:

[0006] A vibration-resistant torque motor structure with position monitoring is characterized by comprising: an upper magnetic conductor, an armature, a support tube, a spring tube, a lower magnetic conductor, a mounting base, a first magnet, a second magnet, a first torque motor screw, a second torque motor screw, a third torque motor screw, a fourth torque motor screw, a first limiting structure, a second limiting structure, a first spring tube screw, and a second spring tube screw.

[0007] The first limiting structure and the second limiting structure are exactly the same, both including a first mounting screw, a first fixing plate, a first limiting monitor, a second mounting screw, a third mounting screw, a second limiting monitor, a second fixing plate, a fourth mounting screw, and a third limiting monitor;

[0008] The first fixing plate is fixed to the upper magnetic conductor and the lower magnetic conductor by the first mounting screw and the second mounting screw respectively, and the second fixing plate is fixed to the upper magnetic conductor and the lower magnetic conductor by the third mounting screw and the fourth mounting screw respectively;

[0009] Furthermore, the upper conductor magnet has a threaded hole at the middle of both pole shoes for installing a third limit monitor. The distance between the third limit monitor and the armature can be adjusted by the threaded pair to limit the armature and prevent it from getting stuck. It can also monitor the displacement of the armature along the axial direction of the third limit monitor in real time.

[0010] Furthermore, the first fixing plate has a threaded hole in the middle for installing the first limit monitor. The distance between the first limit monitor and the armature can be adjusted by the threaded pair to play a limiting role. It can also monitor the displacement of the armature along the axial direction of the first limit monitor in real time.

[0011] Furthermore, the second fixing plate has a threaded hole in the middle for installing the second limit monitor. The distance between the second limit monitor and the armature can be adjusted by the threaded pair, and its function is the same as that of the first limit monitor.

[0012] Furthermore, the left and right magnetic poles of the armature are completely symmetrical, while the upper and lower magnetic poles are asymmetrical, and the area of ​​the upper surface magnetic pole is larger than that of the lower surface magnetic pole.

[0013] Furthermore, the components contained in the first limiting structure and the second limiting structure are made of the same material and are all non-magnetic materials, so as not to affect the magnetic flux distribution of the entire magnetic circuit.

[0014] Furthermore, the vibration-resistant torque motor structure with position monitoring is characterized in that the components of the first limiting structure and the second limiting structure are made of the same material and are all non-magnetic materials.

[0015] Compared with existing torque motor structures, this invention has the following advantages:

[0016] (1) The limit monitor can limit the movement of the armature at too large an angle, protect the thin-walled components of the spring tube, and improve the reliability and vibration resistance of the torque motor;

[0017] (2) The limit distance can be adjusted according to the acceleration value in the application scenario;

[0018] (3) The motion state of the armature can be monitored in real time. The motion posture of the armature in space can be obtained by collecting data from 6 limit monitors. Attached Figure Description

[0019] Figure 1 Front view of a torque motor;

[0020] Figure 2 Right view of a torque motor;

[0021] Figure 3 Left view of a torque motor;

[0022] Figure 4 Top view of a torque motor;

[0023] Figure 5 Schematic diagram of armature assembly. Detailed Implementation

[0024] To more intuitively and clearly illustrate the structural principles and working methods in the embodiments of the present invention, the following description will be based on the accompanying drawings. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] The embodiments of the present invention provide a vibration-resistant torque motor structure with position monitoring. Through structural innovation, by installing a limit monitor on the upper conductor magnet and the fixed plate, the armature's deflection movement at too large an angle is firstly limited to prevent the elastic element of the Bourdon tube from being damaged, thereby improving the reliability and life of the torque motor. Secondly, the movement state of the armature is monitored to obtain the armature's posture in space.

[0026] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0027] A vibration-resistant torque motor structure with position monitoring, such as... Figure 1 , 2 As shown in Figures 3 and 4, the structure includes: an upper magnetic conductor 1, an armature 2, a support tube 3, a spring tube 4, a lower magnetic conductor 5, a mounting base 6, a first magnet 7, a second magnet 11, a first torque motor screw 8, a second torque motor screw 10, a third torque motor screw 20, a fourth torque motor screw 21, a first limiting structure A, a second limiting structure B, a first spring tube screw 23, and a second spring tube screw 24; the spring tube 4 has connecting seats of a certain thickness at both ends, and a thin-walled cylindrical structure in the middle;

[0028] The inner hole of the armature 2 is interference-fitted with the support tube 3, and the root of the step of the support tube 3 is interference-fitted with the inner hole of the spring tube 4. The spring tube 4 is fastened to the mounting base 6 by the first spring tube screw 22 and the second spring tube screw 23. The mounting base 6 is also equipped with a lower magnetic conductor 5. The upper surface of the lower magnetic conductor 5 is equipped with a first magnet 7 and a second magnet 11. The upper surface of the first magnet 7 and the second magnet 11 is equipped with an upper magnetic conductor 1. The upper magnetic conductor 1, the first magnet 7, the second magnet 11 and the lower magnetic conductor 5 are fastened by the first torque motor screw 8, the second torque motor screw 10, the third torque motor screw 20 and the fourth torque motor screw 21 to form a magnetic circuit assembly. The upper magnetic conductor 1, the armature 2 and the lower magnetic conductor 5 form four working air gaps.

[0029] The first limiting structure A and the second limiting structure B are exactly the same, both including the first mounting screw 12, the first fixing plate 13, the first limiting monitor 14, the second mounting screw 15, the third mounting screw 16, the second limiting monitor 17, the second fixing plate 18, the fourth mounting screw 19, and the third limiting monitor 9.

[0030] The first fixing plate 13 is fixed to the upper magnetic conductor 1 and the lower magnetic conductor 5 by the first mounting screw 12 and the second mounting screw 15 respectively, and the second fixing plate 18 is fixed to the upper magnetic conductor 1 and the lower magnetic conductor 5 by the third mounting screw 16 and the fourth mounting screw 19 respectively.

[0031] The upper magnetic conductor 1 has a threaded hole at the middle of both pole shoes for installing the third limit monitor 9. The distance between the third limit monitor 9 and the armature 2 can be adjusted by the threaded pair to limit the armature and prevent it from being stuck. It can also monitor the displacement of the armature 2 along the axial direction of the third limit monitor 9 in real time.

[0032] The first fixing plate 13 has a threaded hole in the middle position for installing the first limit monitor 14. The distance between the first limit monitor 14 and the armature 2 can be adjusted by the threaded pair. It can not only limit the movement, but also monitor the displacement of the armature 2 along the axial direction of the first limit monitor 14 in real time.

[0033] The second fixing plate 18 has a threaded hole in the middle for installing the second limit monitor 17. The distance between the second limit monitor 17 and the armature 2 can be adjusted by the threaded pair, and its function is the same as that of the first limit monitor 14.

[0034] The left and right magnetic poles of the armature 2 are completely symmetrical, while the upper and lower magnetic poles are asymmetrical, such as... Figure 5 As shown, the magnetic pole area 24 on the upper surface is larger than the magnetic pole area 25 on the lower surface, which compensates for the reduction in electromagnetic force caused by the threaded hole on the upper magnetic conductor 1.

[0035] The vibration-resistant torque motor structure with position monitoring is characterized in that the components contained in the first limiting structure A and the second limiting structure B are made of the same material and are all non-magnetic materials, so as not to affect the magnetic flux distribution of the entire magnetic circuit.

[0036] Compared with existing torque motor structures, this invention has the following advantages:

[0037] (1) The limit monitor can limit the movement of the armature at too large an angle, protect the thin-walled components of the spring tube, and improve the reliability and vibration resistance of the torque motor;

[0038] (2) The limit distance can be adjusted according to the acceleration value in the application scenario;

[0039] (3) The motion state of the armature can be monitored in real time. The motion posture of the armature in space can be obtained by collecting data from 6 limit monitors.

[0040] The present invention has been described in detail above with reference to the accompanying drawings and specific embodiments. It should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described, and these examples should not be construed as limited to those set forth herein. Rather, these examples are described to further highlight the positive effects of the present invention, and all aspects not detailed herein are considered to be well-known or conventional techniques in the art.

Claims

1. A vibration-resistant torque motor structure with position monitoring, characterized in that, include: Upper magnet (1), armature (2), support tube (3), spring tube (4), lower magnet (5), mounting base (6), first magnet (7), second magnet (11), first torque motor screw (8), second torque motor screw (10), third torque motor screw (20), fourth torque motor screw (21), first limiting structure (A), second limiting structure (B), first spring tube screw (23), second spring tube screw (24); The first limiting structure (A) and the second limiting structure (B) are exactly the same, both including the first mounting screw (12), the first fixing plate (13), the first limit monitor (14), the second mounting screw (15), the third mounting screw (16), the second limit monitor (17), the second fixing plate (18), the fourth mounting screw (19), and the third limit monitor (9). The first fixing plate (13) is fixed to the upper magnetic conductor (1) and the lower magnetic conductor (5) by the first mounting screw (12) and the second mounting screw (15) respectively, and the second fixing plate (18) is fixed to the upper magnetic conductor (1) and the lower magnetic conductor (5) by the third mounting screw (16) and the fourth mounting screw (19) respectively; The upper magnet (1) has a threaded hole at the middle of the pole shoes at both ends for installing the third limit monitor (9); the first fixing plate (13) has a threaded hole at the middle for installing the first limit monitor (14); the spring tube (4) has connecting seats of a certain thickness at both ends and a thin-walled cylindrical structure in the middle; The inner hole of the armature (2) is press-fitted with the support tube (3), and the root of the step of the support tube (3) is press-fitted with the inner hole of the spring tube (4). The spring tube (4) is fastened to the mounting base (6) by the first spring tube screw (22) and the second spring tube screw (23). The mounting base (6) is also equipped with a lower magnetic conductor (5). The upper surface of the lower magnetic conductor (5) is equipped with a first magnet (7) and a second magnet (11). The upper surface of the first magnet (7) and the second magnet (11) is equipped with an upper magnetic conductor (1). The upper magnetic conductor (1), the first magnet (7), the second magnet (11) and the lower magnetic conductor (5) are fastened by the first torque motor screw (8), the second torque motor screw (10), the third torque motor screw (20) and the fourth torque motor screw (21) to form a magnetic circuit assembly. The upper magnetic conductor (1), the armature (2) and the lower magnetic conductor (5) form four working air gaps.

2. The vibration-resistant torque motor structure with position monitoring according to claim 1, characterized in that, The distance between the third limit monitor (9) and the armature (2) is adjusted by the threaded pair to play a limiting role, suppress the armature from being sucked in, and monitor the displacement of the armature (2) along the axial direction of the third limit monitor (9) in real time.

3. The vibration-resistant torque motor structure with position monitoring according to claim 1, characterized in that, The distance between the first limit monitor (14) and the armature (2) is adjusted by the threaded pair to play a limiting role and monitor the displacement of the armature (2) along the axial direction of the first limit monitor (14) in real time.

4. The vibration-resistant torque motor structure with position monitoring according to claim 1, characterized in that, The second fixing plate (18) has a threaded hole in the middle position for installing the second limit monitor (17). The distance between the second limit monitor (17) and the armature (2) is adjusted by the threaded pair, and its function is the same as that of the first limit monitor (14).

5. The vibration-resistant torque motor structure with position monitoring according to claim 4, characterized in that, The left and right magnetic poles of the armature (2) are completely symmetrical, while the upper and lower magnetic poles are asymmetrical. The area of ​​the upper magnetic pole is larger than that of the lower magnetic pole, which compensates for the reduction in electromagnetic force caused by the threaded hole on the upper conductor (1).

6. The vibration-resistant torque motor structure with position monitoring according to claim 1, characterized in that, The components contained in the first limiting structure (A) and the second limiting structure (B) are made of the same material and are both non-magnetic materials.

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