A valve sleeve outer zero adjustment structure servo valve

Abstract

The application belongs to the technical field of mechanical hydraulic pressure, and discloses a servo valve with a valve sleeve outer zero adjustment structure, which comprises a valve core, a valve sleeve, a shell, a nut assembly, an eccentric shaft, a bushing, a feedback rod and an armature assembly. The shell is internally provided with a horizontal adjustment cavity, the eccentric shaft is arranged in the adjustment cavity c, the rear end of the eccentric shaft is connected with the nut assembly, and the outer thread of the nut assembly is matched with the inner thread of the adjustment cavity c. The shell is internally provided with a through hole for mounting the valve sleeve, the front end of the eccentric shaft extends into the through hole and is connected with the valve sleeve adjustment half groove a in a matched mode, the valve core is arranged in the valve sleeve, and the valve core is coaxially arranged with the valve sleeve. The shell is internally provided with a shell overflow cavity d downward from the top surface, the shell overflow cavity d is communicated with the through hole for mounting the valve sleeve, the valve sleeve is provided with a valve sleeve overflow cavity b, the shell overflow cavity d and the valve sleeve overflow cavity b are coaxial, the bushing is inserted into the shell overflow cavity d and the valve sleeve overflow cavity b, one end of the feedback rod is arranged in the armature assembly, the other end of the feedback rod is inserted into the annular feedback rod groove e of the valve core through the bushing, and the feedback rod can drive the valve core to move horizontally in the valve sleeve.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical engineering and relates to a valve sleeve external zero adjustment structure servo valve. BACKGROUND

[0002] The user cannot independently adjust the zero position of the servo valve after the traditional electro-hydraulic servo valve is completed and delivered from the factory. Adjusting the zero position of the servo valve must return the servo valve to the manufacturer, and the servo valve is disassembled in a super-clean workshop to adjust the zero position, which is complicated to operate, has high technical difficulty, takes a long time, and has high cost. With the increasing demand for electro-hydraulic servo valves in the field of aviation and aerospace, such as airplanes and missiles, reducing the time cost and economic cost of the return of the electro-hydraulic servo valve to the factory for maintenance, improving the use efficiency of the electro-hydraulic servo valve, and reducing the operation and maintenance difficulty of the electro-hydraulic servo valve have become a problem to be solved at present. Designing an electro-hydraulic servo valve that can independently adjust the zero output without disassembly has become the focus of attention in the field of electro-hydraulic servo valve testing. In order to overcome the defect that the user cannot adjust the zero position after the traditional electro-hydraulic servo valve is delivered, a kind of electro-hydraulic servo valve with external zero adjustment, simple structure, high reliability and convenient operation is developed, which has very important theoretical significance and engineering application value for improving the use efficiency of the electro-hydraulic servo valve in the field of aviation and aerospace. SUMMARY

[0003] The purpose of the application is to overcome the defect that the existing electro-hydraulic servo valve cannot externally adjust the zero position. The application provides a valve sleeve external zero adjustment structure servo valve with an internal zero adjustment structure in the housing. The adjustment cavity opening is in communication with the outside of the housing. The zero position can be adjusted by rotating the nut assembly without disassembling the servo valve. The operation is simple, and it is not necessary to strictly control the cleanliness of the operating environment. The risk of contaminating the internal oil of the servo valve during operation is avoided. The servo valve can meet the user's demand for independent adjustment of the zero position during use, improve the matching of the servo valve with the upper system during use, and reduce the failure rate of the servo valve. The external zero adjustment device of the valve sleeve external zero adjustment structure servo valve of the application is composed of a nut assembly and an eccentric shaft, which also plays a role in positioning the valve sleeve. Axial movement of the valve sleeve in the housing is avoided, which causes the covering amount of the valve core shoulder and the corresponding valve sleeve opening to change, thereby avoiding changes in the output flow or pressure of the servo valve, improving the stability of the zero position and the output flow or pressure of the servo valve, and improving the reliability of the performance of the servo valve. The external zero adjustment device of the valve sleeve external zero adjustment structure servo valve of the application is installed in the adjustment cavity of the housing, and the adjustment cavity reserves the space required for the wrench to rotate. The overall weight of the servo valve is reduced, which can effectively meet the harsh requirements of the aviation and aerospace field for the weight of the servo valve.

[0004] The technical scheme of the application is as follows:

[0005] A valve sleeve external zero adjustment structure servo valve, comprising: a valve core 1, a valve sleeve 2, a housing 3, a nut assembly 4, an eccentric shaft 5, a bushing 7, a feedback rod 8, an armature assembly 9;

[0006] The shell 3 is internally provided with a horizontal adjusting cavity c, the eccentric shaft 5 is arranged in the adjusting cavity c, and the rear end of the eccentric shaft 5 is connected with the nut assembly 4.

[0007] The shell 3 is internally provided with a through hole for mounting the valve sleeve 2, the front end of the eccentric shaft 5 extends into the through hole and is connected with the adjusting half groove a of the valve sleeve 2, the valve core 1 is arranged in the valve sleeve 2, and the valve core 1 is coaxially arranged with the valve sleeve 2.

[0008] The shell 3 is internally provided with a shell overflow cavity d downward from the top surface, the shell overflow cavity d is communicated with the through hole for mounting the valve sleeve 2, the valve sleeve 2 is provided with a valve sleeve overflow cavity b, the shell overflow cavity d and the valve sleeve overflow cavity b are coaxial, the bushing 7 is inserted into the shell overflow cavity d and the valve sleeve overflow cavity b, one end of the feedback rod 8 is arranged in the armature assembly 8, the other end of the feedback rod 8 is inserted into the annular feedback rod groove e of the valve core 1 through the bushing 7, and the feedback rod 8 can drive the valve core 1 to move horizontally in the valve sleeve 2.

[0009] Further, the sealing ring 6 is arranged between the outer cylindrical surface of the eccentric shaft 5 close to the front end and the adjusting cavity c, so that the oil leakage of the spool valve stage is avoided.

[0010] Further, the axial direction of the valve sleeve overflow cavity b is perpendicular to the axial direction of the valve sleeve 2 and passes through the axial center of the valve sleeve 2.

[0011] Further, the rear end of the eccentric shaft 5 is pressed into the nut assembly 4 in an interference manner.

[0012] Further, the opening of the adjusting cavity c is communicated with the outside of the shell, and an adjusting wrench operation space is reserved.

[0013] Further, the eccentric amount of the front end axis and the rear end axis of the eccentric shaft 5 is not greater than the stroke of the valve core 1 and not greater than the preset adjusting amount of the valve sleeve 2.

[0014] Further, the valve core 1 is provided with the convex shoulder 11 at both ends and the middle shaft section.

[0015] Further, the valve sleeve 2 is provided with the opening 12 at both ends and the middle shaft section, and the convex shoulder 11 and the opening 12 are one-to-one corresponding.

[0016] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0017] 1. The valve sleeve outer zero adjustment structure servo valve of the present application is provided with an inner zero adjustment structure on the shell, the adjustment cavity opening is communicated with the outside of the shell, zero adjustment can be carried out by rotating the nut assembly without disassembling the servo valve, the operation is simple, the operation environment cleanliness does not need to be strictly controlled, the risk of contaminating the internal oil of the servo valve during operation is avoided, the demand of users for self-adjustment of zero position during use can be met, the matching with the upper system during use of the servo valve is improved, and the failure rate of the servo valve is reduced.

[0018] 2. The valve sleeve outer zero adjustment structure of the present application is rotated at the front end of the eccentric shaft in the valve sleeve adjustment half groove, drives the valve sleeve to translate along the axial direction, changes the relative position of the valve sleeve and the valve core, changes the covering amount of the valve core shoulder and the corresponding valve sleeve opening, thereby changing the output flow size or pressure size of the servo valve, and the purpose of adjusting the zero position of the servo valve is achieved.

[0019] 3. In the present application, the eccentric amount of the front end axis and the rear end axis of the eccentric shaft is not greater than the stroke of the valve core and not greater than the preset valve sleeve adjustment amount, the eccentric amount is strictly set, the efficiency of external zero adjustment can be improved, and the damage to the valve core, feedback rod and other servo valve parts caused by excessive displacement of the valve sleeve during zero adjustment is avoided.

[0020] 4. In the valve sleeve outer zero adjustment structure servo valve of the present application, when external zero adjustment is not needed, the nut assembly and the eccentric shaft are fixed, the front end of the eccentric shaft is inserted into the valve sleeve adjustment half groove, the outer zero adjustment device composed of the nut assembly and the eccentric shaft simultaneously plays a valve sleeve positioning role, avoids the axial movement of the valve sleeve in the shell, changes the covering amount of the valve core shoulder and the corresponding valve sleeve opening, thereby avoiding the change of the output flow or pressure of the servo valve, improving the zero position stability and the output flow or pressure stability of the servo valve, and improving the reliability of the performance of the servo valve.

[0021] 5. In the present application, the outer zero adjustment device is installed in the adjustment cavity of the shell, and the adjustment cavity reserves the space required for the rotation of the wrench. The overall weight of the servo valve is reduced, which can effectively meet the harsh requirements of the aerospace field on the weight of the servo valve. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a valve sleeve outer zero adjustment structure servo valve principle diagram of the present application.

[0023] Figure 2 is a valve sleeve outer zero adjustment structure servo valve principle diagram of the present application.

[0024] Figure 3 is a relative position diagram of the valve sleeve and the outer zero adjustment structure of the present application.

[0025] Figure 4 is a front view of the eccentric shaft of the valve sleeve outer zero adjustment structure servo valve of the present application.

[0026] Figure 5 is a valve sleeve outer zero setting structure servo valve eccentric shaft top view of the application.

[0027] Wherein: 1 is the valve core, 2 is the valve sleeve, 3 is the shell, 4 is the nut assembly, 5 is the eccentric shaft, 6 is the sealing ring, 7 is the bushing, 8 is the feedback rod, 9 is the armature assembly, 10 is the torque motor, 11 is the shoulder, 12 is the opening, a is the valve sleeve adjustment half groove, b is the valve sleeve overflow cavity, c is the shell adjustment cavity, d is the shell overflow cavity, e is the annular feedback rod groove. DETAILED DESCRIPTION

[0028] The application is further described below in conjunction with the embodiments shown in the drawings.

[0029] Example 1

[0030] The application provides a valve sleeve outer zero setting structure servo valve, as shown in Figure 1 , Figure 2 , comprising: a valve core 1, a valve sleeve 2, a shell 3, a nut assembly 4, an eccentric shaft 5, a bushing 7, a feedback rod 8, an armature assembly 9; the shell 3 is internally provided with a horizontal adjustment cavity c, the rear end of the eccentric shaft 5 is connected with the nut assembly 4, the outer thread of the nut assembly 4 matches the inner thread of the adjustment cavity c; the shell 3 is internally provided with a through hole for mounting the valve sleeve 2, the front end of the eccentric shaft 5 extends into the through hole and is connected with the valve sleeve 2 adjustment half groove a, the valve core 1 is arranged in the valve sleeve 2, and the valve core 1 and the valve sleeve 2 are coaxially arranged; the shell 3 is internally provided with a shell overflow cavity d downward from the top surface, the shell overflow cavity d communicates with the through hole for mounting the valve sleeve 2, the valve sleeve 2 is provided with a valve sleeve overflow cavity b, the shell overflow cavity d and the valve sleeve overflow cavity b are coaxial, the bushing 7 is inserted into the shell overflow cavity d and the valve sleeve overflow cavity b, one end of the feedback rod 8 is arranged in the armature assembly 9, the other end of the feedback rod 8 is inserted into the annular feedback rod groove e of the valve core 1 through the bushing 7, and the feedback rod 8 can drive the valve core 1 to move horizontally in the valve sleeve 2.

[0031] Further, it further comprises a sealing ring 6, which is arranged between the outer cylindrical surface of the eccentric shaft 5 close to the front end and the adjustment cavity c, to avoid the leakage of the spool valve stage oil.

[0032] Further, the axial direction of the valve sleeve overflow cavity b is perpendicular to the axial direction of the valve sleeve 2 and passes through the shaft center of the valve sleeve 2.

[0033] Further, the rear end of the eccentric shaft 5 is pressed into the nut assembly 4 in an interference manner.

[0034] Further, the opening of the adjustment cavity c communicates with the outside of the shell, leaving space for the operation of the adjusting wrench.

[0035] Further, the eccentricity of the front end axis and the rear end axis of the eccentric shaft 5 is not greater than the stroke of the spool 1 and not greater than the preset adjustment amount of the valve sleeve 2.

[0036] Further, the spool 1 is provided with a shoulder 11 at both ends and a middle shaft section.

[0037] Further, the valve sleeve 2 is provided with an opening 12 at both ends and a middle shaft section, and the shoulder 11 and the opening 12 are one-to-one corresponding.

[0038] Figure 3 is a relative position diagram of the valve sleeve and the external zero adjustment structure of the present application.

[0039] When the servo valve needs external zero adjustment, the torque motor 12 inputs a zero position control signal, the armature assembly 9 and the feedback rod 8 are in the zero position under the action of the torque motor 10, and the feedback rod 8 drives the spool 1 to be in the zero position; the nut assembly 4 is rotated by a wrench, the front end of the eccentric shaft 5 is rotated in the adjustment half groove a of the valve sleeve 2, the valve sleeve 2 is translated along the axis direction, the relative position of the valve sleeve 2 and the spool 1 is changed, the covering amount of the spool shoulder 11 and the corresponding valve sleeve opening 12 is changed to be larger or smaller, and thus the output flow size or pressure size of the servo valve is changed, so as to achieve the purpose of adjusting the zero position of the servo valve.

[0040] The adjustment cavity c opening is communicated with the outside of the shell 3, the zero position can be adjusted by rotating the nut assembly 4 without disassembling the servo valve, the operation is simple, it is not necessary to strictly control the cleanliness of the operation environment, the risk of contaminating the internal oil of the servo valve in the operation process is avoided, the demand of users for self-adjusting the zero position in use can be met, the matching of the servo valve with the superior system in use is improved, and the failure rate of the servo valve is reduced.

[0041] When the servo valve does not need external zero adjustment, the nut assembly 4 and the eccentric shaft 5 are fixed, the front end of the eccentric shaft 5 is inserted into the valve sleeve adjustment half groove a, the external zero adjustment device composed of the nut assembly 4 and the eccentric shaft 5 simultaneously plays a valve sleeve positioning role, the axial movement of the valve sleeve 2 in the shell 3 is avoided, the covering amount of the spool shoulder 11 and the corresponding valve sleeve opening 12 is changed, and thus the output flow or pressure of the servo valve is changed, the stability of the zero position and the output flow or pressure of the servo valve is improved, and the reliability of the performance of the servo valve is improved.

[0042] Figure 4 、 Figure 5 is an eccentric shaft of a valve sleeve external zero adjustment structure servo valve of the present application. The eccentricity of the front end axis and the rear end axis of the eccentric shaft 5 is not greater than the stroke of the spool 1 and not greater than the preset adjustment amount of the valve sleeve 2, the eccentricity setting requirement is strict, the efficiency of external zero adjustment can be improved, and the displacement of the valve sleeve during zero adjustment is avoided to damage the spool, the feedback rod and other servo valve parts.

[0043] The external zero adjusting device in the application is installed in the adjusting cavity c of the shell, and the adjusting cavity reserves space required for the rotation of a wrench.

[0044] The foregoing description of the embodiments is for the purpose of enabling a person with ordinary skill in the art to understand and apply the application. Those skilled in the art can easily make various modifications to the embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the application is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art based on the disclosure of the application without departing from the scope of the application should be within the protection scope of the application.

Claims

1. A valve-in-housing zeroing structure servo valve, characterized by, It includes: Valve core (1), valve sleeve (2), shell (3), nut assembly (4), eccentric shaft (5), bushing (7), feedback rod (8), armature assembly (9); The shell (3) is internally provided with a horizontal adjusting cavity c, the eccentric shaft (5) is arranged in the adjusting cavity c, the rear end of the eccentric shaft (5) is connected with the nut assembly (4), and the outer thread of the nut assembly (4) is matched with the inner thread of the adjusting cavity c. The shell (3) is internally provided with a through hole for mounting the valve sleeve (2), the front end of the eccentric shaft (5) extends into the through hole and is connected with the adjusting half groove a of the valve sleeve (2), the valve core (1) is arranged in the valve sleeve (2), and the valve core (1) and the valve sleeve (2) are coaxially arranged. The shell (3) is internally provided with a shell overflow cavity d downward from the top surface, the shell overflow cavity d is communicated with the through hole for mounting the valve sleeve (2), the valve sleeve (2) is provided with a valve sleeve overflow cavity b, the shell overflow cavity d and the valve sleeve overflow cavity b are coaxial, the bushing (7) is inserted into the shell overflow cavity d and the valve sleeve overflow cavity b, one end of the feedback rod (8) is arranged in the armature assembly (9), the other end is inserted into the annular feedback rod groove e of the valve core (1) through the bushing 7, and the feedback rod (8) can drive the valve core (1) to move horizontally in the valve sleeve (2). The valve core (1) is provided with a shoulder (11) at both ends and a middle shaft section, respectively; the valve sleeve (2) is provided with an opening (12) at both ends and a middle shaft section, respectively, and the positions of the shoulder (11) and the opening (12) correspond one by one; the front end of the eccentric shaft rotates in the adjusting half groove of the valve sleeve, drives the valve sleeve to translate along the axial direction, changes the relative position of the valve sleeve and the valve core, changes the covering amount of the valve core shoulder and the corresponding valve sleeve opening, and thus changes the output flow size or pressure size of the servo valve.

2. The servo valve of claim 1, wherein, It also includes a sealing ring (6), which is arranged between the outer cylindrical surface of the front end of the eccentric shaft (5) and the adjusting cavity c, to prevent the spool valve stage from leaking oil.

3. The servo valve of claim 1, wherein, The axial direction of the valve sleeve overflow cavity b is perpendicular to the axial direction of the valve sleeve (2) and passes through the shaft center of the valve sleeve (2).

4. The servo valve of claim 1, wherein, The rear end of the eccentric shaft (5) is pressed into the nut assembly (4) in an interference manner.

5. The servo valve of claim 1, wherein, The adjusting cavity c opening is communicated with the outside of the shell (3), and an adjusting wrench operation space is reserved.

6. The servo valve of claim 1 wherein: The eccentric amount of the front end axis of the eccentric shaft (5) and the rear end axis is not greater than the stroke of the valve core (1) and not greater than the preset adjusting amount of the valve sleeve (2).

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