Armature jet flow deflection plate assembly and applied electro-hydraulic servo valve

Abstract

The invention discloses an armature jet flow deflection plate assembly and an applied electro-hydraulic servo valve, and belongs to the technical field of electro-hydraulic servo valves. The damper comprises an armature deflection plate assembly and a first-stage seat assembly, a traditional thin-wall cylinder spring tube is replaced with a spring beam of an n-shaped structure, return oil is sealed through a sealing ring, and magnetorheological fluid and a driver are installed on the spring beam to adjust rigidity. The spring tube solves the problems that a traditional spring tube is poor in vibration resistance, high in machining difficulty and non-adjustable in rigidity, the vibration resistance value can reach 100 G or above, the machining cost is reduced, the spring tube is suitable for flow servo valves of different specifications, the influence of a sealing ring on armature displacement hysteresis is eliminated through the structural design, and the zero-position stability is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electro-hydraulic servo valves, and particularly relates to an armature jet deflector plate assembly and an electro-hydraulic servo valve applying the same. BACKGROUND

[0002] Double-nozzle baffle, jet pipe, jet deflector plate electro-hydraulic servo valves are widely used in electro-hydraulic servo control systems in the fields of aviation, aerospace, navigation, etc. A common two-stage electro-hydraulic servo valve mainly consists of a pilot stage and a spool valve stage. Generally, the pilot stage converts the displacement of an armature into the displacement of a jet flow device by a spring tube, which is a thin-walled cylindrical part. The thin-walled cylindrical spring tube also plays a role in oil return sealing. The thickness of the thin-walled spring tube in the industry is generally about 0.01 mm. With the development of high-performance aircraft engines, the vibration value of the system is significantly improved, even reaching more than 100G. The conventional spring tube is difficult to withstand such high vibration values. In order to improve the vibration resistance of the spring tube, the industry generally increases the wall thickness of the spring tube. However, this measure has certain limitations and cannot increase the wall thickness indefinitely. Because the wall thickness of the spring tube increases, the stiffness also increases, which seriously affects the optimal solution of the parameter matching of the servo valve armature assembly, causing problems such as excessive magnetization, armature sticking, armature shaking, zero position sudden jump, etc. In addition, it also reduces the dynamic performance of the product. In addition, the stiffness value of the thin-walled spring tube significantly affects the dynamic and static performance of the servo valve. The industry has strict requirements for the size tolerance and stiffness value of the part. The stiffness value is measured during processing to ensure that the part meets the stiffness requirements. At the same time, the wall thickness of about 0.01 mm has a low qualified rate during processing and is prone to processing defects or even failure, which increases the cost of the product and has low reliability. SUMMARY

[0003] The purpose of the present application is to provide an armature jet deflector plate assembly and an electro-hydraulic servo valve applying the same. A "door" type beam structure spring beam is used instead of the traditional thin-walled cylindrical spring tube part, and a sealing ring is used for oil return sealing. This structure improves the vibration resistance of the servo valve. Compared with the traditional spring tube structure with a wall thickness of about 0.01 mm, the same stiffness value is achieved. The thin wall of the "door" type beam structure spring beam is 70-80 times thicker, reaching 0.7-0.8 mm. A magnetorheological damper is arranged at the torsion position of the spring beam. This structure adjusts the stiffness of the spring beam to adapt to different stiffness adjustments of different specifications of flow servo valves and reduces the processing difficulty, improving the universality of the armature jet deflector plate assembly.

[0004] To achieve the above purpose, the armature jet deflector plate assembly structure provided by the present application adopts the following technical scheme: An armature jet flow deflection plate assembly for electro-hydraulic servo valve, comprising an armature deflection plate assembly and a primary seat assembly; the armature deflection plate assembly comprises an armature, a spring beam, a deflection plate, a first magneto-rheological fluid, a first magneto-rheological fluid driver, a second magneto-rheological fluid, and a second magneto-rheological fluid driver; the primary seat assembly comprises a sealing ring, a sealing sleeve, a primary seat, an elastic sheet, an upper pressing block, a jet flow sheet, and a lower pressing block; the armature is axisymmetric, with a square structure in the middle and a circular through hole, and the square structure surface is connected and fixed with the upper step surface of the spring beam in a "door" structure; the upper surface of the spring beam is symmetrically provided with a first mounting hole and a second mounting hole, the first mounting hole is provided with the first magneto-rheological fluid driver, the first mounting hole and the second mounting hole are filled with the first magneto-rheological fluid, the second mounting hole is provided with the second magneto-rheological fluid driver, the second mounting hole and the second mounting hole are filled with the second magneto-rheological fluid, and the spring beam is provided with a circular step hole in the middle; the upper end cylindrical surface of the deflection plate is gap-fitted and brazed with the circular through hole of the armature and the circular step hole of the spring beam; the sealing ring and the sealing sleeve are sequentially placed in the upper end step hole of the primary seat, and the elastic sheet, the upper pressing block, the jet flow sheet, and the lower pressing block are sequentially placed in the lower end step hole of the primary seat; the armature deflection plate assembly is installed on the primary seat assembly by screws, and the deflection plate sequentially passes through the primary seat, the sealing ring, the sealing sleeve, the elastic sheet, the upper pressing block, the jet flow sheet, and the lower pressing block.

[0005] Further, the armature middle circular through hole is coaxial with the spring beam middle circular through hole.

[0006] Further, the armature axis is perpendicular to the first mounting hole and the second mounting hole center line of the spring beam.

[0007] Further, the armature axis is parallel to the deflection plate flat surface jet flow groove.

[0008] Further, the armature axis passes through the rotation center of the armature deflection plate assembly.

[0009] Further, the sealing ring inner diameter center is on the rotation center of the armature deflection plate assembly.

[0010] Further, the bisection surface between the spring beam first mounting hole bottom surface and the first magneto-rheological fluid driver bottom end surface passes through the rotation center of the armature deflection plate assembly, and the bisection surface between the spring beam second mounting hole bottom surface and the second magneto-rheological fluid driver bottom end surface passes through the rotation center of the armature deflection plate assembly.

[0011] Further, the stiffness of the first magneto-rheological fluid is adjusted by adjusting the first magneto-rheological fluid driver, the stiffness of the second magneto-rheological fluid is adjusted by adjusting the second magneto-rheological fluid driver, and the final stiffness of the spring beam is controlled.

[0012] As a typical application of the present application, it is applied to an electro-hydraulic servo valve, which adopts the armature jet flow deflection plate assembly for electro-hydraulic servo valve designed as above.

[0013] Compared with the existing armature jet deflector plate assembly for electro-hydraulic servo valve, the present application has the following advantages: (1) The "door" type beam structure spring beam structure design improves the vibration resistance of the servo valve, which can reach more than 100G; (2) The magneto-rheological fluid is used at the bending position of the spring beam, which improves the convenience of stiffness adjustment of the spring beam, the convenience of processing, and the convenience of adaptation to different models; (3) By designing the rotation center of the armature deflector plate assembly, the inner diameter of the sealing ring, and the position of the magneto-rheological fluid, the influence of the sealing ring on the hysteresis of the armature displacement is reduced to zero, and the zero position stability of the torque motor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. The drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0015] Figure 1 is a structure diagram of the armature jet deflector plate assembly of the present application; Figure 2 is a schematic diagram of a spring beam; Figure 3 is a schematic diagram of an armature deflector plate assembly; Figure 4 is a schematic diagram of a primary seat assembly; Marked: armature 1, spring beam 2, deflector plate 3, sealing ring 4, sealing sleeve 5, primary seat 6, elastic sheet 7, upper pressing block 8, jet sheet 9, lower pressing block 10, first magneto-rheological fluid 11, first magneto-rheological fluid driver 12, second magneto-rheological fluid 14, second magneto-rheological fluid driver 13. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0017] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0018] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0020] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] 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.

[0022] In its specific implementation, this invention designs an armature jet deflector assembly, such as... Figure 1 , 2 As shown in Figures 3 and 4, the components include: armature 1, spring beam 2, deflection plate 3, first magnetorheological fluid 11, first magnetorheological fluid actuator 12, second magnetorheological fluid 14, second magnetorheological fluid actuator 13, sealing ring 4, sealing sleeve 5, primary seat 6, elastic sheet 7, upper pressure block 8, jet sheet 9, and lower pressure block 10. The armature 1, spring beam 2, deflection plate 3, first magneto-rheological fluid 11, first magneto-rheological fluid driver 12, second magneto-rheological fluid 14, and second magneto-rheological fluid driver 13 form an armature deflection plate assembly I. The armature 1 is axisymmetric, with cantilevered ends and a square middle portion having a circular through hole. The square surface of the middle portion of the armature 1 is in contact with the upper step surface of the spring beam 2 and is connected by brazing at the joint. The spring beam 2 has a "door" structure, with a first mounting hole 2.1 and a second mounting hole 2.2 symmetrically provided on the upper surface. The first magneto-rheological fluid driver 12 is mounted in the first mounting hole 2.1, and the bottom end surface of the first magneto-rheological fluid driver 12 is filled with the first magneto-rheological fluid 11 between the bottom of the first mounting hole 2.1. The second magneto-rheological fluid driver 13 is mounted in the second mounting hole 2.2, and the bottom end surface of the second magneto-rheological fluid driver 13 is filled with the second magneto-rheological fluid 14 between the bottom of the second mounting hole 2.2. A circular step hole is provided in the middle of the spring beam 2. The upper end of the deflection plate 3 is cylindrical, the middle end has a flat surface jet flow groove, and the lower end has a feedback ball. The upper end cylindrical surface of the deflection plate 3 is in clearance fit with the circular through hole of the armature 1 and the circular step hole of the spring beam 2, and is connected by brazing at the joint. The sealing ring 4, sealing sleeve 5, primary seat 6, elastic sheet 7, upper pressing block 8, jet flow sheet 9, and lower pressing block 10 form a primary seat assembly II. The primary seat 6 has a "J" shape, with a step hole provided at the upper end and a step hole provided at the lower end. The sealing ring 4 and the sealing sleeve 5 are sequentially placed in the upper end step hole, and the elastic sheet 7, upper pressing block 8, jet flow sheet 9, and lower pressing block 10 are sequentially placed in the lower end step hole. The armature deflection plate assembly I is mounted on the primary seat assembly II by screws, and the deflection plate 3 sequentially passes through the primary seat 6, sealing ring 4, sealing sleeve 5, elastic sheet 7, upper pressing block 8, jet flow sheet 9, and lower pressing block 10. In the specific implementation process, in order to facilitate the control of the hysteresis and zero position of the servo valve, the middle circular through hole of the armature 1 is coaxial with the middle circular through hole of the spring beam 2, the axis of the armature 1 is perpendicular to the line connecting the centers of the first mounting hole 2.1 and the second mounting hole 2.2 of the spring beam 2, the axis of the armature 1 is parallel to the flat surface jet flow groove of the deflection plate 3, the axis of the armature 1 passes through the rotation center of the armature deflection plate assembly I, the inner diameter center of the sealing ring 4 is on the rotation center of the armature deflection plate assembly I, the bisector between the bottom end surface of the first magneto-rheological fluid driver 12 and the bottom of the first mounting hole 2.1 of the spring beam 2 passes through the rotation center of the armature deflection plate assembly I, and the bisector between the bottom end surface of the second magneto-rheological fluid driver 13 and the bottom of the second mounting hole 2.2 of the spring beam 2 passes through the rotation center of the armature deflection plate assembly I. In the specific implementation process, in order to facilitate the control of the rigidity of the torque motor, the rigidity of the first magneto-rheological fluid 11 is adjusted by adjusting the first magneto-rheological fluid driver 13, the rigidity of the second magneto-rheological fluid 14 is adjusted by adjusting the second magneto-rheological fluid driver 13, and then the final rigidity of the spring beam 2 is controlled; On the basis of the above structure design, it is applied in an electro-hydraulic servo valve, and specific installation logic is as follows: the lower magnetic conductor is installed on the spring beam, one magnetic steel is placed in front of and behind the upper magnetic conductor, the upper magnetic conductor is installed above the magnetic steel, the control coil is installed in the region formed by the lower magnetic conductor, the magnetic steel, the upper magnetic conductor and the armature, four torque motor screws fix the lower magnetic conductor, the magnetic steel and the upper magnetic conductor on the spring beam, the primary seat is installed in the shell, the shell is internally provided with a valve sleeve, the valve sleeve is internally provided with a valve core, and the feedback ball at the lower end of the deflection plate is matched with the ball groove or the ball hole in the valve core.

[0023] The above specific embodiments are detailed descriptions of the present application, and cannot be considered as limitations of the specific embodiments of the present application. For ordinary skilled persons in the technical field of the present application, a number of simple deductions and substitutions can be made without departing from the concept of the present application, and all of them should be considered as falling within the protection scope of the present application.

Claims

1. An armature jet deflector plate assembly for an electro-hydraulic servo valve, characterized in that, It includes an armature deflection plate assembly and a first-stage seat assembly; the armature deflection plate assembly includes an armature, a spring beam, a deflection plate, a first magnetorheological fluid, a first magnetorheological fluid driver, a second magnetorheological fluid, and a second magnetorheological fluid driver; the first-stage seat assembly includes a sealing ring, a sealing sleeve, a first-stage seat, an elastic sheet, an upper pressing block, a jet sheet, and a lower pressing block; the armature is axisymmetric, with a square structure in the middle and a circular through-hole, and the surface of the square structure is connected and fixed to the upper step surface of the spring beam in a "door"-type structure; on the upper surface of the spring beam, a first mounting hole and a second mounting hole are symmetrically provided. The first magnetorheological fluid driver is installed in the first mounting hole, and the first magnetorheological fluid is filled between them. The second magnetorheological fluid driver is installed in the second mounting hole, and the second magnetorheological fluid is filled between them. A circular step hole is provided in the exact middle of the spring beam; the upper cylindrical surface of the deflection plate is in clearance fit with the circular through-hole of the armature and the circular step hole of the spring beam and is connected by brazing; in the upper step hole of the first-stage seat, a sealing ring and a sealing sleeve are sequentially placed, and in the lower step hole, an elastic sheet, an upper pressing block, a jet sheet, and a lower pressing block are sequentially placed; the armature deflection plate assembly is installed on the first-stage seat assembly by screws, and the deflection plate passes through the first-stage seat, the sealing ring, the sealing sleeve, the elastic sheet, the upper pressing block, the jet sheet, and the lower pressing block in sequence.

2. The armature jet deflector plate assembly for an electro-hydraulic servo valve according to claim 1, characterized in that, The circular through-hole in the middle of the armature is coaxially arranged with the circular step hole in the exact middle of the spring beam.

3. The armature jet deflector plate assembly for an electro-hydraulic servo valve according to claim 2, characterized in that, The axis of the armature is perpendicular to the connecting line of the centers of the first mounting hole and the second mounting hole on the spring beam.

4. The armature jet deflector plate assembly for an electro-hydraulic servo valve according to claim 1, characterized in that, The axis of the armature is parallel to the flat jet groove provided in the middle of the deflection plate.

5. The armature jet deflector plate assembly for an electro-hydraulic servo valve according to claim 1, characterized in that, The center of the inner diameter of the sealing ring is located on the rotation center of the armature deflection plate assembly.

6. The armature jet deflector plate assembly for an electro-hydraulic servo valve according to claim 1, characterized in that, The bisecting plane between the bottom surface of the first mounting hole of the spring beam and the bottom end surface of the first magnetorheological fluid driver, and the bisecting plane between the bottom surface of the second mounting hole and the bottom end surface of the second magnetorheological fluid driver both pass through the rotation center of the armature deflection plate assembly.

7. The armature jet deflector plate assembly for an electro-hydraulic servo valve according to claim 6, characterized in that, By adjusting the first magnetorheological fluid driver to change the stiffness of the first magnetorheological fluid and adjusting the second magnetorheological fluid driver to change the stiffness of the second magnetorheological fluid, the final stiffness of the spring beam is controlled.

8. The armature jet deflector plate assembly for an electro-hydraulic servo valve according to claim 1, characterized in that, The upper end of the deflection plate is cylindrical, a flat jet groove is provided in the middle, and a feedback ball is provided at the lower end.

9. The armature jet deflector plate assembly for an electro-hydraulic servo valve according to claim 1, characterized in that, The first-stage seat is in a "J" shape, and a step hole is provided at the upper end and the lower end respectively.

10. An electro-hydraulic servo valve, characterized in that, Adopt the armature jet deflection plate assembly for an electro-hydraulic servo valve as described in any one of claims 1 to 9.

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