End cover assembly with flow adjusting and limiting function and applied servo valve

Abstract

The utility model belongs to the technical field of servo valves, and particularly discloses an end cover assembly with a flow adjusting and limiting function and an applied servo valve, and the end cover assembly comprises an end cover and a limiting screw; a boss structure is arranged in the center of the end cover, and the boss structure can extend into a shell of the servo valve and abut against the end face of a valve sleeve of the servo valve. The center of the end cover is provided with a step hole used for installing a limiting screw, the limiting screw penetrates through the step hole and extends into the valve sleeve, a certain distance is kept between the limiting screw and the end face of the valve element, and the distance can be adjusted through the limiting screw. According to the utility model, the servo valve limiting flow debugging efficiency is greatly improved, the working steps are simplified, and the workload is reduced, so that the repeated debugging, repairing and grinding cost is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electro-hydraulic servo valve technical field, especially a kind of end cover assembly with regulating limit flow function and the servo valve of application. BACKGROUND

[0002] Electro-hydraulic servo valve is important control element of electro-hydraulic servo system, and it plays the role of electro-hydraulic conversion and power amplification in system, and is widely used in aviation, aerospace, ship and other fields.

[0003] Traditional servo valve limit flow regulation adopts the design structure form of limit block, generally two limit blocks are symmetrically arranged on the both sides of valve core, the end of two limit blocks is flush with the end of valve sleeve, and finally end cover is fixedly installed on shell to limit and fix one end of limit block.

[0004] Main weakness / issue: when regulating limit flow, when flow is insufficient, end cover needs to be disassembled, limit block is taken out, and limit block axial length is revised and processed, then limit block is installed into valve sleeve, end cover is fixed, and limit flow test is carried out again to judge;The above debugging process usually needs to be repeated several times, and the efficiency is low, which greatly affects product debugging time. INVENTION CONTENTS

[0005] The utility model aims at solving the above-mentioned problems, and provides an end cover assembly with regulating limit flow function and the servo valve of application, to solve the problem that traditional electro-hydraulic servo valve limit flow regulation structure needs to be repeatedly disassembled and debugged.

[0006] Technical scheme: in order to realize the above-mentioned purpose, the utility model provides an end cover assembly with regulating limit flow function, which comprises end cover and limit screw;The center position of the end cover is provided with boss structure, the boss structure can extend into the shell of servo valve, and abuts against the end face of servo valve sleeve;The end cover is provided with stepped hole for installing limit screw, the limit screw extends into valve sleeve through the stepped hole, and keeps a certain distance from the end face of valve core, and the distance can be adjusted by limit screw.

[0007] Further, sealing assembly is arranged between the limit screw and the end cover and between the end cover and the shell.

[0008] Further, the sealing assembly adopts the combined sealing structure of O-ring and check ring.

[0009] Further, adjusting gasket is arranged between the limit screw and the end face of the end cover.

[0010] Further, the adjusting gasket can be correspondingly provided with thickness according to the adjustment distance of limit screw.

[0011] Further, the end cover end face is provided with an identification which is uniformly distributed along the center of the screw mounting hole in the circumferential direction, and an arrow identification is arranged on the end face of the limiting screw, which is used for recording the rotating angle of the limiting screw when the limiting distance is adjusted.

[0012] Further, the end cover stepped hole is provided with an internal thread near the small hole on the side of the valve sleeve.

[0013] As a typical application of the end cover assembly with the adjusting and limiting flow function, the utility model also designs a servo valve, the servo valve comprises a front stage and a slide valve stage, and the slide valve stage comprises the end cover assembly designed above.

[0014] The utility model works as follows: when the flow of the servo valve is insufficient, the position of the screw is directly adjusted by the internal hexagonal wrench outside until the flow of the servo valve is sufficient; at this time, the rotating angle of the screw arrow is observed, the rotating linear distance of the screw is converted, and the adjusting gasket of the same thickness value is selected and installed, and then the screw is tightened, so that the disassembly-free servo valve limiting flow rapid adjusting function is realized.

[0015] The utility model has the advantages of the following:

[0016] The limiting flow of the traditional servo valve mainly depends on the debugging calculation flow difference, the valve core displacement is roughly converted, the end cover is disassembled, the limiting plug is taken out, the end face of the limiting plug is ground again after installation, and the traditional servo valve needs to be repeatedly disassembled and debugged, so that the efficiency is low, the time is long, the workload is large, and the limiting flow is not accurate.

[0017] Compared with the end cover structure of the traditional servo valve, the utility model patent adopts a new type of limiting screw (such as an internal hexagonal adjustable structure screw) with sealing instead of the original limiting plug, the end cover stepped hole is passed through by the screw, the limiting flow of the servo valve can be quickly adjusted by adjusting the position of the screw without disassembling the end cover; the rotating angle of the screw can be judged by the arrow on the outer end face of the screw corresponding to the circular mark uniformly distributed on the outer end face of the end cover, the adjusting distance of the screw is converted, the adjusting gasket of the same thickness value is selected and installed, and finally the screw is tightened, so that the servo valve limiting flow debugging efficiency is greatly improved, the working steps are simplified, the workload is reduced, and the repeated debugging and grinding cost is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the end cover assembly of the utility model;

[0019] Figure 2 It is a structure schematic view of the utility model application servo valve;

[0020] Wherein, 1 - limit screw, 2 - adjusting washer, 3 - first check ring, 4 - first sealing ring, 5 - end cover, 6 - second check ring, 7 - second sealing ring, 8 - valve core, 9 - valve sleeve, 10 - shell. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the utility model is described in detail below in combination with the drawings or specific implementation cases, and 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 understood as being limited to the examples set forth herein. On the contrary, these examples are described so that the positive effects of the utility model are more embodied, and the details not described herein are regarded as known or conventional technical means in the art.

[0022] Referring to the drawings Figure 1 2 In the specific implementation process of the utility model, an end cover assembly with adjusting and limiting flow functions is designed, which comprises a limiting screw 1, an adjusting washer 2, a first check ring 3, a first sealing ring 4, an end cover 5, a second check ring 6, a second sealing ring 7, a valve core 8, a valve sleeve 9 and a shell 10.

[0023] Among them, the limiting screw 1 and the end cover 5 are used in cooperation as an end cover assembly, the center position of the end cover 5 is provided with a boss structure, the boss structure can extend into the shell 10 of the servo valve and abut against the end face of the valve sleeve 9 of the servo valve, the end cover 5 is provided with a stepped hole in the center for installing the limiting screw 1, the limiting screw 1 extends into the valve sleeve 9 through the stepped hole and keeps a certain distance from the end face of the valve core 8, and the distance can be adjusted by the limiting screw 1.

[0024] In order to ensure the sealing reliability of the structure, sealing assemblies are arranged between the limiting screw 1 and the end cover 5 and between the end cover 5 and the shell 10, and a sealing ring is generally used to realize sealing, that is Figure 1 the first sealing ring 4 and the second sealing ring 7 in the sealing assembly; considering the actual application, the sealing performance is enhanced, and the sealing ring is used in cooperation with the check ring, that is Figure 1 the combination of the first check ring 3, the second check ring 6 and the sealing ring.

[0025] In some improved implementation cases, a plurality of adjusting washers 2 are arranged between the limiting screw 1 and the end face of the end cover 5, and the thickness of the adjusting washer can be set according to the adjustment distance required by the limiting screw.

[0026] ​The end cover assembly designed as above is applied to an electro-hydraulic servo valve, the servo valve comprising a pre-stage and a spool valve stage, the spool valve stage comprising the end cover assembly designed as above, when the servo valve has insufficient flow, the position of the screw is directly adjusted by an internal hex wrench outside until the flow of the servo valve meets the requirement; at this time, the rotation angle of the screw arrow is observed, the screw rotation linear distance is converted, and the adjusting washer of the same thickness value is selected and installed, and then the screw is tightened, so that the disassembly-free servo valve limiting flow quick adjustment function is realized.

[0027] Since the limiting screw passes through the end cover stepped hole, the disassembly of the end cover can be avoided and the servo valve limiting flow quick adjustment can be realized by adjusting the position of the screw; the rotation angle of the screw can be judged by the arrow on the outer end surface of the screw corresponding to the circular marks uniformly distributed on the outer end surface of the end cover, the screw adjustment distance is converted, and the adjusting washer of the same thickness value is selected and installed, and then the screw is tightened, so that the servo valve limiting flow debugging efficiency is greatly improved, the working steps are simplified, the work load is reduced, and the repeated debugging and grinding cost is greatly reduced.

[0028] The above specific embodiments or cases are only used to explain the technical solutions of the utility model, and are not limited to the application, and the parts not described in detail are regarded as conventional technical means or common knowledge in the art; it can be understood by those skilled in the art that: based on the design idea of the application, the technical solutions recorded in the foregoing embodiments can be adaptively modified, or part or all of the technical features can be replaced, the modified, replaced and adapted technical solutions do not deviate from the technical essence of the utility model, and should be covered in the protection scope of the application.

Claims

1. An end cap assembly with adjustable and limiting flow rate function, characterized in that, The end cap assembly includes an end cap and a limiting screw; the end cap is configured with a boss structure at its center, which can extend into the housing of the servo valve and abut against the end face of the servo valve sleeve; the end cap has a stepped hole at its center for installing the limiting screw, which passes through the stepped hole and extends into the valve sleeve, maintaining a certain distance from the end face of the valve core, and this distance can be adjusted by the limiting screw.

2. The end cap assembly with adjustable flow limit function as described in claim 1, characterized in that, Sealing components are provided between the limiting screw and the end cap, and between the end cap and the housing.

3. The end cap assembly with adjustable flow limit function as described in claim 2, characterized in that, The sealing assembly adopts a combination sealing structure of O-ring and retaining ring.

4. The end cap assembly with adjustable flow limit function as described in claim 1, characterized in that, An adjusting shim is provided between the limiting screw and the end face of the end cap.

5. An end cap assembly with adjustable flow limit function as described in claim 4, characterized in that, The thickness of the adjusting shim can be set according to the adjustment distance required by the limit screw.

6. An end cap assembly with adjustable flow limit function as described in claim 1, characterized in that, The end cap has markings evenly distributed around the center of the screw mounting hole on its end face, and arrow markings are provided on the end face of the limit screw to record the rotation angle of the limit screw when adjusting the limit distance.

7. A servo valve, the servo valve comprising a pre-stage and a spool stage, characterized in that, The slide valve stage includes the end cap assembly as described in any one of claims 1 to 6.

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