High-efficiency high-stability high-pressure-resistant torque motor for servo valve and assembly process method

Abstract

The invention provides a high-efficiency high-stability high-pressure-resistant torque motor for a servo valve and an assembly process method. An armature assembly (8) comprises a damping wire (15), an armature (16), a mounting ring (17), a spring tube (18), a spring tube base (19) and a counter-force rod (20). A mounting ring (17), a bourdon tube (18), a bourdon tube base (19) and a counter-force rod (20) are designed in a split mode, one end of a damping wire (15) is additionally inserted into an upper shell (11), and the other end of the damping wire (15) is inserted into the center of the upper end of an armature (16) and welded to the mounting ring (17). According to the torque motor for the servo valve, the howling restraining capacity of the torque motor for the servo valve can be improved, and therefore the armature assembly can still keep stable when bearing disturbance of a high-pressure jet flow field while high-gain and high-efficiency work of the torque motor is guaranteed.

Description

Technical Field

[0001] This invention relates to the technical field of hydraulic components, and in particular to a high-efficiency, high-stability, high-pressure torque-resistant motor for servo valves and its assembly process. Background Technology

[0002] With the rapid development of aviation technology, the main characteristics of future equipment requirements are lightweight, high maneuverability, ultra-high speed, and high reliability. Future aircraft will also place higher demands on their core and critical systems. Electro-hydraulic servo valves, as core control components in hydraulic actuation systems, act as power amplifiers, converting low-power electrical signals into flow or pressure power signals to drive the actuators. Their failure will directly lead to the failure of the hydraulic control system, affecting the performance of the aircraft's core and critical systems.

[0003] As the pressure system continues to increase, the rapid temperature changes caused by the servo valve throttling and the structural leakage magnetic effect affect the electromagnetic conversion circuit magnetic characteristics of the torque motor under different working conditions. At the same time, changes in the coil current and the rotation of the armature will cause eddy currents to be generated inside the magnetic material, resulting in a decrease in the electromagnetic conversion efficiency of the torque motor under complex working conditions. Ultimately, this leads to a significant decrease in the conversion efficiency of the torque motor under high pressure.

[0004] To meet the high flow rate and high dynamic performance requirements of servo valves, a high-gain torque motor structure is typically designed. However, a high-gain design for the torque motor leads to a decrease in its stability margin. A torque motor with a low stability margin is prone to forced vibration and high-frequency noise when subjected to unstable hydrodynamic forces. Under high-frequency alternating hydrodynamic forces, the stiffness of the Bourdon tube in the low-damping motor armature assembly gradually decreases, severely affecting the dynamic performance and stability of the servo valve. Long-term operation of the torque motor under low-damping conditions increases the risk of fatigue damage to the armature assembly, ultimately leading to structural failure of the product. Summary of the Invention

[0005] This invention provides a high-efficiency, high-stability, high-pressure torque motor for servo valves and an assembly process, which solves the problem that long-term operation of high-gain torque motors under low-damping conditions increases the risk of fatigue damage to the armature assembly, leading to structural failure of the product.

[0006] The first aspect of the present invention provides a high-efficiency, high-stability, high-pressure torque resistant motor for servo valves, comprising: an armature assembly 8 and an upper housing 11; the armature assembly 8 includes: a damping wire 15, an armature 16, a mounting ring 17, a spring tube 18, a spring tube base 19, and a reaction rod 20. Mounting ring 17 is located inside the center of armature 16. The lower end of mounting ring 17 is interference-fitted with spring tube 18. The lower end of spring tube 18 is interference-fitted with spring tube base 19. Spring tube base 19 is inserted into upper housing 11 and presses against jet disk 12, connecting the oil passage of jet disk 12 with the oil passage of upper housing 11. Through upper housing 11, the oil passage on spring tube base 19 is connected to the servo valve slide stage. The lower end of spring tube base 19 is connected to reaction rod 20. One end of the damping wire 15 is inserted into the upper housing 11, and the other end is inserted into the center of the upper end of the armature 16 and welded to the mounting ring 17.

[0007] Optionally, the lower end of the mounting ring 17 is welded to the spring tube 18, and the lower end of the spring tube 18 is welded to the spring tube base 19.

[0008] Optionally, the spring tube base 19 is interference-fitted with the reaction rod 20.

[0009] Optionally, the damping wire 15 is mounted in the mounting ring 17 with a clearance fit and is connected by brazing.

[0010] Optionally, a horizontal hole is provided in the upper housing 11, which is perpendicularly intersecting the vertical circular hole through which the damping wire 15 is inserted in the upper housing 11.

[0011] Optionally, the servo valve uses a high-efficiency, high-stability, high-pressure torque resistant motor, which also includes: a separator ring 1, a motor screw 2, a gasket 3, a motor limit screw 4, an upper magnetic conductor 5, a coil assembly 6, a magnet 7, a lower magnetic conductor 9, an adjusting shim 10, a jet cover 13, and a positioning pin 14. The jet plate 12 and the lower jet cover 13 are placed in the central circular hole of the upper shell 11; The lower magnetic conductor 9 is placed on the upper surface of the upper housing 11, with an adjusting shim 10 inserted in the middle; The armature assembly 8 is disposed on the lower magnetic conductor 9 and inserted into the lower magnetic conductor 9 and the upper housing 11; The positioning pin 14 is inserted into the pin hole in the spring tube base, jet disk 12, and lower jet cover plate 13 of the armature assembly 8; The coil assembly 6 is respectively fitted onto the left and right arms of the armature assembly 8, the magnet 7 is set on the lower magnetic conductor 9, and the upper magnetic conductor 5 is pressed tightly on the magnet 7. The upper magnetic conductor 5, the lower magnetic conductor 9, and the upper housing 11 are fixedly connected by motor screws 2 and washers 3; The motor limit screw 4 is threaded into the 2 threaded mounting holes of the upper magnet; The separator ring 1 is inserted into the large circular hole in the center of the upper magnet 5.

[0012] A second aspect of the present invention provides an assembly process method for a high-efficiency, high-stability, high-pressure torque resistant motor for a servo valve as described in any one of the first aspects, comprising: First, the mounting ring 17 is press-fitted to achieve an interference fit with the armature 16, and its connection strength is strengthened by laser welding; Secondly, the upper and lower ends of the spring tube 18 are press-fitted to achieve an interference fit with the mounting ring 17 and the spring tube base 19, respectively, and the connection strength is strengthened by laser welding. Then, the reaction rod 20 is press-fitted to the spring tube base 19 to achieve an interference fit; Finally, the damping wire 15 is installed into the mounting ring 17 with a clearance fit, and its effective connection is achieved by brazing. Then, its assembly stress is eliminated by vacuum heat treatment.

[0013] Optionally, the assembly process may also include: The lower magnetic conductor 9 is placed on the upper surface of the upper housing 11, and the adjusting shim 10 is inserted in the middle; At the same time, the jet disk 12 and the lower jet cover plate 13 are placed into the central hole of the upper housing 11 from below, and the armature assembly 8, the jet disk 12, and the lower jet cover plate 13 are positioned by the positioning pin 14. Then, the coil assembly 6 is respectively fitted into the left and right arms of the armature assembly 8, and the magnet 7 is placed on the lower magnetic conductor 9 at the front and rear positions of the armature assembly 8, and then the upper magnetic conductor 5 is used to press the magnet 7 tightly. Place the washer 3 onto the stud of the motor screw 2, insert the motor screw 2 into the four mounting holes of the upper magnetic conductor 5 and the lower magnetic conductor 9, and tighten it in the four threaded holes of the upper housing 11. Finally, the motor limit screw 4 is screwed into the two threaded mounting holes of the upper magnet and the separator ring 1 is inserted into the large circular hole in the center of the upper magnet 5, thereby realizing the assembly of a high-efficiency and high-stability torque motor.

[0014] This invention provides a high-efficiency, high-stability, high-pressure torque motor for servo valves and its assembly process. It can improve the ability of torque motors for servo valves to suppress whistling, thereby ensuring high gain and high-efficiency operation of the torque motor while maintaining the stability of the armature assembly under high-pressure jet flow field disturbance. In addition, the above-mentioned armature assembly method increases the structural connection strength and sealing capability under high pressure, and is suitable for servo valve applications in high-pressure systems. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is an exploded view of a high-efficiency, high-stability torque motor for a servo valve according to an embodiment of the present invention. Figure 2 This is an assembly schematic diagram of a high-efficiency, high-stability torque motor for a servo valve according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the assembly of the armature assembly 8 and the upper housing 11 according to an embodiment of the present invention; Figure 4 This is an exploded view of the armature assembly 8 according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the assembly of the armature assembly 8 according to an embodiment of the present invention; Among them: 1-separator ring, 2-motor screw, 3-washer, 4-motor limit screw, 5-upper magnet, 6-coil assembly, 7-magnet, 8-armature assembly, 9-lower magnet, 10-adjusting shim, 11-upper housing, 12-jet plate, 13-lower jet cover, 14-positioning pin, 15-damping wire, 16-armature, 17-mounting ring, 18-spring tube, 19-spring tube base, 20-reaction rod. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0019] like Figure 1-5 As shown, the present invention provides a high-efficiency, high-stability, high-pressure torque motor for servo valves, including: an armature assembly 8, an upper housing 11, and other components of the torque motor; the armature assembly 8 includes: a damping wire 15, an armature 16, a mounting ring 17, a spring tube 18, a spring tube base 19, and a reaction rod 20. Mounting ring 17 is located inside the center of armature 16. The lower end of mounting ring 17 is interference-fitted with spring tube 18. The lower end of spring tube 18 is interference-fitted with spring tube base 19. Spring tube base 19 is inserted into upper housing 11 and presses against jet disk 12, connecting the oil passage of jet disk 12 with the oil passage of upper housing 11. Through upper housing 11, the oil passage on spring tube base 19 is connected to the servo valve slide stage. The lower end of spring tube base 19 is connected to reaction rod 20. One end of the damping wire 15 is inserted into the upper housing 11, and the other end is inserted into the center of the upper end of the armature 16 and welded to the mounting ring 17.

[0020] Damping wire 15 is used to improve the ability of armature assembly 8 to suppress minor vibrations; The armature 16 is used to provide an effective magnetic circuit for the torque motor; Mounting ring 17 is used to provide an effective connection for Bourdon tube 18, damping wire 15 and armature 16; Bourdon tube 18 is used to provide deformation force for armature assembly 8; The spring tube base 19 is used to provide structural support for the spring tube 18, and can also press the jet disk 12, while communicating the oil passage of the jet disk 12 with the oil passage of the upper housing 11. The reaction rod 20 is used to provide a deflection structure, which changes the flow field of the jet disk 12 as the armature 16 moves, and at the same time provides feedback force for the movement of the servo valve slide valve stage valve core; The upper housing 11 provides structural support for the Bourdon tube base 19 and connects the oil passage of the Bourdon tube base 19 to the servo valve slide stage.

[0021] Furthermore, this invention also provides an assembly process method for some parts of the torque motor. This mainly involves the assembly of the armature assembly 8: First, the mounting ring 17 is press-fitted to achieve an interference fit with the armature 16, and its connection strength is strengthened by laser welding; Secondly, the upper and lower ends of the spring tube 18 are press-fitted to achieve an interference fit with the mounting ring 17 and the spring tube base 19, respectively, and the connection strength is strengthened by laser welding. Then, the reaction rod 20 is press-fitted to the spring tube base 19 to achieve an interference fit; Finally, the damping wire 15 is installed into the mounting ring 17 with a clearance fit, and its effective connection is achieved by brazing. Then, its assembly stress is eliminated by vacuum heat treatment.

[0022] like Figure 1 and Figure 2 As shown, a high-efficiency, high-stability torque motor for servo valves may include: a separator ring 1, a motor screw 2, a gasket 3, a motor limit screw 4, an upper magnetic conductor 5, a coil assembly 6, a magnet 7, an armature assembly 8, a lower magnetic conductor 9, an adjusting shim 10, an upper housing 11, a jet plate 12, a lower jet cover 13, and a positioning pin 14.

[0023] The lower magnet 9 is placed on the upper surface of the upper housing 11, with an adjusting shim 10 inserted in the middle. Then, the lower cylindrical structure of the armature assembly 8 is inserted from above into the central circular hole of the upper housing 11, while ensuring that the lower cylindrical part of the damping wire 15 in the armature assembly 8 is inserted into the circular hole on the upper surface of the upper housing 11. Figure 5As shown, in the performance test of the high-efficiency and high-stability torque motor, the tooling is inserted into the horizontal hole that intersects with the vertical circular hole on the upper surface of the upper housing 11 to adjust the installation posture of the damping wire 15. After ensuring the zero-position performance of the high-efficiency and high-stability torque motor assembly, the lower cylinder of the damping wire 15 and the vertical circular hole on the upper surface of the upper housing 11 form a rigid constraint. Simultaneously, the jet disk 12 and the lower jet cover plate 13 are placed into the central circular hole of the upper housing 11 from below, and the armature assembly 8, the jet disk 12, and the lower jet cover plate 13 are positioned using the positioning pin 14; then the coil assembly 6 is respectively fitted onto the left and right arms of the armature assembly 8, and the magnet 7 is placed on the lower magnetic conductor 9 at the front and rear positions of the armature assembly 8, and then the magnet 7 is pressed tightly by the upper magnetic conductor 5; the washer 3 is fitted onto the stud of the motor screw 2, and the motor screw 2 is inserted into the four mounting holes of the upper magnetic conductor 5 and the lower magnetic conductor 9, and finally tightened in the four threaded holes of the upper housing 11; finally, the motor limit screw 4 is screwed into the two threaded mounting holes of the upper magnetic conductor, and the separator ring 1 is inserted into the central large circular hole of the upper magnetic conductor 5, thereby realizing the assembly of a high-efficiency and high-stability torque motor.

[0024] The above-described embodiments of the invention enable the assembly of a high-efficiency, high-stability torque motor, and the zero-position performance of the high-efficiency, high-stability torque motor can be adjusted by adjusting the installation posture of the damping wire 15. The damping wire design of the armature assembly improves the torque motor's ability to resist minor disturbances from the high-pressure jet flow field under high-gain, high-efficiency conditions, thus increasing the stability of the torque motor. Furthermore, the above-described armature assembly method increases structural connection strength and sealing capability under high pressure, making it suitable for servo valve applications in high-pressure systems.

[0025] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A high-efficiency, high-stability, high-pressure torque resistant motor for servo valves, characterized in that, include: Armature assembly (8), upper housing (11); Armature assembly (8) includes: damping wire (15), armature (16), mounting ring (17), spring tube (18), spring tube base (19), and reaction rod (20); The mounting ring (17) is located inside the center of the armature (16). The lower end of the mounting ring (17) is interference-fitted with the spring tube (18). The lower end of the spring tube (18) is interference-fitted with the spring tube base (19). The spring tube base (19) is inserted into the upper housing (11) and presses the jet plate (12) to communicate with the oil passage of the jet plate (12) and the oil passage of the upper housing (11). Through the upper housing (11), the oil passage on the spring tube base (19) communicates with the servo valve slide valve stage. The lower end of the spring tube base (19) is connected to the reaction rod (20). One end of the damping wire (15) is inserted into the upper housing (11), and the other end is inserted into the center of the upper end of the armature (16) and welded to the mounting ring (17).

2. The high-efficiency, high-stability, high-pressure torque resistant motor for servo valves according to claim 1, characterized in that, The lower end of the mounting ring (17) is welded to the spring tube (18), and the lower end of the spring tube (18) is welded to the spring tube base (19).

3. The high-efficiency, high-stability, high-pressure torque resistant motor for servo valves according to claim 1, characterized in that, The spring tube base (19) is interference-fitted with the reaction rod (20).

4. The high-efficiency, high-stability, high-pressure torque resistant motor for servo valves according to claim 1, characterized in that, The damping wire (15) is installed in the mounting ring (17) with a clearance fit and is connected by brazing.

5. The high-efficiency, high-stability, high-pressure torque resistant motor for servo valves according to claim 1, characterized in that, A horizontal hole is provided in the upper housing (11), which is perpendicular to the vertical circular hole through which the damping wire (15) is inserted in the upper housing (11).

6. The high-efficiency, high-stability, high-pressure torque resistant motor for servo valves according to claim 1, characterized in that, Also includes: Separator ring (1), motor screw (2), washer (3), motor limit screw (4), upper conductor magnet (5), coil assembly (6), magnet (7), lower conductor magnet (9), adjusting shim (10), jet cover plate (13), positioning pin (14). The jet disk (12) and the lower jet cover plate (13) are placed in the central circular hole of the upper shell (11); The lower magnet (9) is placed on the upper surface of the upper housing (11), and an adjustment shim (10) is inserted in the middle. The armature assembly (8) is disposed on the lower magnetic conductor (9) and inserted into the lower magnetic conductor (9) and the upper housing (11); The positioning pin (14) is inserted into the pin hole in the spring tube base, jet disk (12) and lower jet cover plate (13) of the armature assembly (8); The coil assembly (6) is respectively fitted onto the left and right arms of the armature assembly (8), the magnet (7) is set on the lower magnetic conductor (9), and the upper magnetic conductor (5) is pressed on the magnet (7); The upper magnet (5), the lower magnet (9) and the upper housing (11) are fixedly connected by motor screws (2) and washers (3); The motor limit screw (4) is threaded into the two threaded mounting holes of the upper magnet; The separator ring (1) is inserted into the large circular hole in the center of the upper magnet (5).

7. An assembly process method for a high-efficiency, high-stability, high-pressure torque resistant motor for a servo valve as described in any one of claims 1-6, characterized in that, include: First, the mounting ring (17) is press-fitted to achieve an interference fit with the armature (16), and its connection strength is strengthened by laser welding; Next, the upper and lower ends of the spring tube (18) are press-fitted to achieve an interference fit with the mounting ring (17) and the spring tube base (19), and the connection strength is strengthened by laser welding. Then, the reaction rod (20) is press-fitted to achieve an interference fit with the spring tube base (19); Finally, the damping wire (15) is installed into the mounting ring (17) with a clearance fit and is effectively connected by brazing. Then, its assembly stress is eliminated by vacuum heat treatment.

8. The assembly process method according to claim 7, characterized in that, Also includes: The lower magnet (9) is placed on the upper surface of the upper housing (11), and the adjusting shim (10) is inserted in the middle. At the same time, the jet disk (12) and the lower jet cover plate (13) are placed into the center hole of the upper shell (11) from below, and the armature assembly (8), the jet disk (12) and the lower jet cover plate (13) are positioned by the positioning pin (14); Then, the coil assembly (6) is put into the left and right arms of the armature assembly (8) respectively, and the magnet (7) is placed on the lower magnetic conductor (9) at the front and rear positions of the armature assembly (8), and the magnet (7) is pressed tightly by the upper magnetic conductor (5). Place the washer (3) on the stud of the motor screw (2), and insert the motor screw (2) into the four mounting holes of the upper magnet (5) and the lower magnet (9), and tighten it in the four threaded holes of the upper housing (11). Finally, the motor limit screw (4) is screwed into the two threaded mounting holes of the upper magnet and the separator ring (1) is inserted into the large circular hole in the center of the upper magnet (5) to achieve the assembly of a high-efficiency and high-stability torque motor.

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