阅读说明：本技术 一种工作棱边结构、阀芯及滑阀 (Working edge structure, valve core and slide valve ) 是由 刘新强 刘飞 冀宏 张建军 李娜娜 于 2021-08-06 设计创作，主要内容包括：本发明公开了一种工作棱边结构、阀芯及滑阀,涉及电液伺服阀技术领域,包括端面结构和周面结构,所述端面结构的一端和所述周面结构的一端连接,所述端面结构和所述周面结构的连接处为棱边结构,所述棱边结构与工作棱边对应,所述端面结构上沿远离所述棱边结构的方向依次设置有第一减摩涂层、第一凸起阵列和第一缓冲带,所述周面结构上沿远离所述棱边结构的方向依次设置有第二减摩涂层、第二凸起阵列和第二缓冲带。本发明将第一缓冲带、第一凸起阵列、第一减摩涂层或第二缓冲带、第二凸起阵列、第二减摩涂层复合使用,能够较好地提高阀芯工作棱边的抗冲蚀能力,降低工作棱边在工作中的冲蚀磨损,延长阀芯的使用寿命。(The invention discloses a working edge structure, a valve core and a slide valve, which relate to the technical field of electro-hydraulic servo valves and comprise an end surface structure and a peripheral surface structure, wherein one end of the end surface structure is connected with one end of the peripheral surface structure, the joint of the end surface structure and the peripheral surface structure is an edge structure, the edge structure corresponds to a working edge, a first antifriction coating, a first protrusion array and a first buffer zone are sequentially arranged on the end surface structure along the direction far away from the edge structure, and a second antifriction coating, a second protrusion array and a second buffer zone are sequentially arranged on the peripheral surface structure along the direction far away from the edge structure. According to the invention, the first buffer zone, the first bump array, the first antifriction coating or the second buffer zone, the second bump array and the second antifriction coating are used in a composite manner, so that the erosion resistance of the working edge of the valve core can be better improved, the erosion wear of the working edge in the working process is reduced, and the service life of the valve core is prolonged.)

1. A working edge structure characterized by: including end face structure and global structure, end face structure's one end with global structure's one end is connected, end face structure with global structure's junction is edge structure, edge structure corresponds with the edge of working, the structural edge of going up of end face is kept away from edge structure's direction has set gradually first antifriction coating, first protruding array and first buffering area, structural edge of going up of global has set gradually second antifriction coating, the protruding array of second and second buffering area.

2. A working edge structure according to claim 1, characterized in that: the first buffer zone and the second buffer zone are made of materials which are softer than those of the valve core.

3. A working edge structure according to claim 1, characterized in that: the first buffer zone and the second buffer zone are both made of copper alloy.

4. A working edge structure according to claim 1, characterized in that: the first protruding array and the second protruding array comprise a plurality of rows of protrusions, and the protrusions of adjacent rows are arranged in a staggered mode.

5. A working edge structure according to claim 1, characterized in that: the protrusion is cylindrical.

6. A working edge structure according to claim 5, characterized in that: the height of the protrusions is 0.5-2 μm, and the diameter of the protrusions is 5-10 μm.

7. A working edge structure according to claim 1, characterized in that: the first and second friction reducing coatings each comprise at least two layers of an anti-erosion coating.

8. A valve cartridge, characterized by: the valve comprises a valve rod, wherein a plurality of shoulders are arranged on the valve rod, a working edge of each shoulder is provided with a working edge structure according to any one of claims 1 to 7, the peripheral surface structure corresponds to the peripheral surface of the shoulder, and the end surface structure corresponds to the end surface of the shoulder.

9. The valve cartridge of claim 8, wherein: the shoulder is provided with a plurality of pressure equalizing grooves.

10. A slide valve, characterized by: comprising a valve cartridge according to claim 8 or 9.

Technical Field

The invention relates to the technical field of electro-hydraulic servo valves, in particular to a working edge structure, a valve core and a sliding valve.

Background

The electro-hydraulic servo valve has the characteristics of compact structure, quick action, sensitive response, reliable use, stable transmission, strong anti-interference capability, high control precision, long service life and the like, and is widely applied to electro-hydraulic servo systems in the fields of aviation, aerospace, ships, metallurgy, chemical industry and the like. The slide valve core and the valve sleeve are paired to form a high-precision main control slide valve of the electro-hydraulic servo valve, so that the oil-liquid direction, pressure and flow rate in the system are accurately controlled.

The slide valve core moves left and right near the zero position of the servo valve under the action of pilot control oil hydraulic pressure difference on two sides, and forms a control valve port with a valve sleeve window, the opening degree of the slide valve port is extremely small and is generally several microns to dozens of microns, but the pressure difference of the valve port is large, and the rated working condition is 3.5 MPa. The high-speed liquid flow containing micron-sized solid particles can seriously erode the working edge of the slide valve core, so that the working edge is broken, the valve port throttling control characteristic is strongly nonlinear, the zero leakage is increased, and the control precision of the electro-hydraulic servo valve is reduced, so that the electro-hydraulic servo valve and the system have important significance for reducing the erosion of the oil and the particles to the slide valve core.

The traditional electro-hydraulic servo valve design generally requires the working edge of the slide valve core to keep a sharp edge, and the fillet is not more than 0.5 micron. In actual machining, the wear resistance of the surface of the valve core is usually enhanced by increasing the integral hardness of the valve core, but the erosion and the abrasion of the working edge of the valve core are not concerned, and the working edge of the valve core is not correspondingly subjected to erosion and corrosion resisting measures.

The prior patent of published documents is searched to find that the research on the erosion resistance problem of the hydraulic slide valve core mainly comprises the following steps: (1) "Luoxin. electrohydraulic proportional directional valve core erosion wear research [ D ]. Huazhong university of science and technology, 2017." build a valve core erosion wear experiment platform, carry out a valve core erosion wear experiment, analyze the influence of flow and valve core hardness on valve core erosion wear, and carry out experiment verification on a simulation result. The results show that: the through-flow capacity of the electro-hydraulic proportional directional valve is gradually reduced along with the increase of the particle diameter; the erosive wear rate of the valve element surface is related to the valve port opening, inlet velocity, particle diameter and valve element hardness. (2) "Chenwenna, half desert black and thick tail scorpion body surface erosion resistance bionic research [ D ] Jilin university, 2019" applies bionic structures such as convex hulls and grooves on the surface of a sample piece, and finds that the erosion resistance and wear resistance of the bionic sample piece are superior to those of the sample piece without measures. (3) The utility model provides a high pressure water valve case valve pocket valve port integrated configuration "(CN 103899766B) has the water injection mouth main valve core of bionical characteristic, and main valve cover surface is opened has the V-arrangement groove of imitative rose willow surface, can effectively reduce the erosion of aquatic silt for flow control valve life-span increases, reduce cost.

The above research on the erosion resistance of the hydraulic spool and the surface provides a beneficial reference for the erosion resistance of the working edge of the hydraulic spool, but has the following disadvantages:

1. the erosion and abrasion of the surface of the valve core are related to factors such as the opening degree, the speed, the particle size and the like of a valve port, but effective solutions are not provided;

2. the existing bionic erosion resistance design is that the surface erosion resistance is designed aiming at the surface of a part, and no erosion resistance measure is provided for the erosion resistance of a working edge, in particular to an erosion resistance structure scheme of the working edge based on the bionic principle;

3. the existing hydraulic valve has single erosion resistance way and poor effect.

Disclosure of Invention

The invention aims to provide a working edge structure, a valve core and a slide valve, which are used for solving the problems in the prior art, reducing the erosion and wear of the working edge in the working process and prolonging the service life of the valve core.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a working edge structure which comprises an end surface structure and a peripheral surface structure, wherein one end of the end surface structure is connected with one end of the peripheral surface structure, the joint of the end surface structure and the peripheral surface structure is an edge structure, the edge structure corresponds to a working edge, a first antifriction coating, a first protrusion array and a first buffer zone are sequentially arranged on the end surface structure along the direction far away from the edge structure, and a second antifriction coating, a second protrusion array and a second buffer zone are sequentially arranged on the peripheral surface structure along the direction far away from the edge structure.

Preferably, the first buffer zone and the second buffer zone are made of materials softer than that of the valve core.

Preferably, the first buffer zone and the second buffer zone are both made of copper alloy.

Preferably, the first protrusion array and the second protrusion array each include a plurality of rows of protrusions, and the protrusions of adjacent rows are arranged in a staggered manner.

Preferably, the protrusion is cylindrical.

Preferably, the height of the protrusions is 0.5 to 2 μm, and the diameter of the protrusions is 5 to 10 μm.

Preferably, the first and second anti-friction coatings each comprise at least two layers of anti-erosion coating.

The invention also provides a valve core, which comprises a valve rod, wherein a plurality of shoulders are arranged on the valve rod, the working edge of each shoulder is provided with the working edge structure, the peripheral surface structure corresponds to the peripheral surface of the shoulder, and the end surface structure corresponds to the end surface of the shoulder.

Preferably, a plurality of pressure equalizing grooves are formed in the shoulder.

The invention also provides a slide valve which comprises the valve core.

Compared with the prior art, the invention has the following technical effects:

according to the invention, the first buffer zone, the first bump array, the first antifriction coating or the second buffer zone, the second bump array and the second antifriction coating are used in a composite manner, so that the erosion resistance of the working edge of the valve core can be better improved, the erosion wear of the working edge in the working process is reduced, and the service life of the valve core is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of a working edge structure portion of the present invention;

FIG. 2 is a schematic view of the valve cartridge of the present invention;

wherein: 100-working edge structure, 200-valve core, 1-end face structure, 2-circumferential surface structure, 3-edge structure, 4-first antifriction coating, 5-first bulge array, 6-first buffer zone, 7-second antifriction coating, 8-second bulge array, 9-second buffer zone, 10-bulge, 11-valve rod, 12-shoulder and 13-pressure equalizing groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

The invention aims to provide a working edge structure, a valve core and a slide valve, which are used for solving the problems in the prior art, reducing the erosion and wear of the working edge in the working process and prolonging the service life of the valve core.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example one

As shown in fig. 1: this embodiment provides a work edge structure 100, including end surface structure 1 and global structure 2, end surface structure 1's one end is connected with global structure 2's one end, end surface structure 1 is edge structure 3 with global structure 2's junction, edge structure 3 corresponds with the work edge, end surface structure 1 is gone up and has been set gradually first antifriction coating 4 along the direction of keeping away from edge structure 3, first protruding array 5 and first buffering area 6, global structure 2 is gone up and has been set gradually second antifriction coating 7 along the direction of keeping away from edge structure 3, protruding array 8 of second and second buffering area 9. In this embodiment, the first buffer zone 6, the first protrusion array 5, the first antifriction coating 4 or the second buffer zone 9, the second protrusion array 8, and the second antifriction coating 7 are used in a composite manner, so that the erosion resistance of the working edge of the valve element 200 can be better improved.

In this embodiment, the first buffer zone 6 and the second buffer zone 9 are made of a material softer than that of the valve element 200.

In this embodiment, the first buffer strip 6 and the second buffer strip 9 are made of copper alloy, wherein the copper alloy contains 3% of lead, 5% of nickel, 12% of tin and 80% of copper.

The first buffer zone 6 and the second buffer zone 9 are made of soft wear-resistant copper alloy, the hardness is low but the wear-resistant copper alloy is wear-resistant, when the hydraulic slide valve core 200 works in a servo valve, the valve port pressure difference formed by the valve core 200 and a valve sleeve window is large, liquid flow and particles have large jet flow impact on a working edge when flowing through the valve port, the first buffer zone 6 and the second buffer zone 9 are a damping and impact-resistant mechanism imitating a neck muscle and flesh belt of a woodpecker, and impact energy of high-pressure high-speed liquid flow and the particles on the working edge is transferred into the first buffer zone 6 and the second buffer zone 9 from a valve core 200 material near the working edge and absorbed, so that the impact energy and the impact force borne by the working edge are reduced. Whether the flow direction is inward or outward, the respective first buffer zone 6 or second buffer zone 9 will function accordingly.

In this embodiment, each of the first protrusion array 5 and the second protrusion array 8 includes a plurality of rows of protrusions 10, and the protrusions 10 of adjacent rows are disposed in a staggered manner.

In this embodiment, the projection 10 is cylindrical. The height of the protrusions 10 is 0.5-2 μm, and the diameter of the protrusions 10 is 5-10 μm.

The first bulge array 5 and the second bulge array 8 are of an erosion-resistant shell structure imitating desert scorpions, when liquid flows through the first bulge array 5 and the second bulge array 8, a plurality of groups of micro karman vortex streets can be generated, and a continuous vortex bed is formed near a working edge, so that the particle track of jet flow to the wall surface is changed, and impact energy is buffered.

In this embodiment, the first antifriction coating 4 and the second antifriction coating 7 each comprise at least two layers of anti-erosion coating. The first antifriction coating 4 and the second antifriction coating 7 adopt at least two layers of anti-erosion coatings to imitate a snake sloughing mechanism to carry out multilayer redundant anti-erosion, and the sacrifice of the outer anti-erosion coating is utilized to protect the inner anti-erosion coating or the surface and the working edge of the valve core 200. The first and second friction reducing coatings 4 and 7 near the working edge protect the inner erosion resistant coating by erosion wear of the outer erosion resistant coating and the integrity of the working edge of the valve cartridge 200 by erosion wear of the inner erosion resistant coating, thereby maintaining the sharpness of the working edge of the valve cartridge 200 for a long period of time.

The working process of the embodiment is as follows: when the valve core 200 moves near the zero position, liquid flow and particles flow through the valve port at a high speed under the driving of large pressure difference in front of and behind the valve port, and jet flow with circular high impact energy is generated at the periphery of the working edge of the valve core 200. The first and second buffer zones 6, 9 transfer and absorb high pressure high velocity fluid flow and impact energy of particles on the working edge from the spool 200 material near the working edge into the first and second buffer zones 6, 9. After flowing through the first protrusion array 5 and the second protrusion array 8 near the wall surface, the liquid flow generates a plurality of groups of micro karman vortex streets, a continuous vortex bed is formed near the working edge, and the particle track of the jet flow to the wall surface is changed and the impact energy is buffered. The first and second friction reducing coatings 4 and 7 near the working edge protect the inner erosion resistant coating by erosion wear of the outer erosion resistant coating, which protects the integrity of the working edge of the valve cartridge 200. In this embodiment, the composite use of three bionic erosion-resistant structures, namely the first buffer zone 6, the first protrusion array 5, the first antifriction coating 4 or the second buffer zone 9, the second protrusion array 8 and the second antifriction coating 7, is adopted, so that the erosion-resistant capability of the working edge of the valve element 200 can be better improved.

The first buffer zone 6 and the second buffer zone 9 of the present embodiment are made of soft wear-resistant copper alloy, and impact energy of high-pressure high-speed liquid flow and particles to the working edge is transferred to the first buffer zone 6 and the second buffer zone 9 from the valve core 200 material near the working edge and absorbed, so that impact energy and impact force borne by the working edge are reduced. When liquid flows through the first protrusion array 5 and the second protrusion array 8 in the bionic working edge, a plurality of groups of micro karman vortex streets can be generated, so that the particle track of jet flow to the wall surface is changed, and impact energy is buffered. The first antifriction coating 4 and the second antifriction coating 7 adopt at least two layers of anti-erosion coatings for multi-layer redundant erosion resistance, and the sharp working edge of the valve element 200 can be kept for a long time.

Example two

As shown in fig. 2: the embodiment provides a valve core 200, including valve rod 11, be provided with a plurality of shoulders 12 on the valve rod 11, the working edge of each shoulder 12 all sets up the working edge structure 100 of an embodiment one, and peripheral structure 2 corresponds with the global of shoulder 12, and end face structure 1 corresponds with the terminal surface of shoulder 12, and peripheral structure 2 can the cladding be around the peripheral of shoulder 12 near the working edge promptly, and end face structure 1 can the cladding be around the terminal surface of shoulder 12 near the working edge. In this embodiment, the shoulder 12 is provided with a plurality of pressure equalizing grooves 13, each pressure equalizing groove 13 is arranged along the circumferential direction, and the plurality of pressure equalizing grooves 13 are arranged along the axial direction.

EXAMPLE III

The present embodiment provides a spool valve including the spool 200 of the second embodiment, and the spool 200 is disposed in a valve housing or valve body. In this embodiment, the erosion wear of the working edge of the valve element 200 is reduced and the service lives of the valve element 200 and the spool valve are prolonged by the comprehensive application of three bionic erosion-resistant measures, namely the first buffer zone 6, the first protrusion array 5, the first antifriction coating 4 or the second buffer zone 9, the second protrusion array 8 and the second antifriction coating 7.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.