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CN-121993620-A - Valve core for throttle valve, processing method of valve core and throttle valve

CN121993620ACN 121993620 ACN121993620 ACN 121993620ACN-121993620-A

Abstract

The application discloses a valve core for a throttle valve, a processing method thereof and the throttle valve, relating to the field of valve design and manufacture, wherein the valve core comprises: the body, the body is from first end to the shutoff portion that the second end orientation was sealed in proper order including connecting portion, be used for with the disk seat contact and be used for improving the erosion resistant portion of erosion resistance ability, the radius of erosion resistant portion has the trend that reduces gradually from first end to the second end orientation, the surface of erosion resistant portion has multiscale structure, multiscale structure includes a plurality of edges the axis direction of body distributes be annular slot portion and a plurality of being located the depressed part on the surface of slot portion, slot portion with the size of depressed part is in microscale range. The application can provide a valve core structure with the advantages of low cost and erosion resistance.

Inventors

  • Zhai Zhenjie
  • WU YU
  • QIU YANHUA
  • YANG JIANYING
  • Qiao Shihang
  • SHEN YUHAN
  • SHEN PENGYU
  • HE HAOMIAO
  • SONG XUECHUN
  • ZHAO YUEQI
  • LEI TING

Assignees

  • 中国石油天然气集团有限公司
  • 北京石油机械有限公司
  • 中国石油集团昆仑制造有限公司

Dates

Publication Date
20260508
Application Date
20251208

Claims (11)

  1. 1. A valve cartridge for a throttle valve, the valve cartridge comprising: The body, the body is from first end to the shutoff portion that the second end orientation was sealed in proper order including connecting portion, be used for with the disk seat contact and be used for improving the erosion portion of erosion resistance ability, the radius of erosion portion has the trend of taper from first end to the second end orientation, the surface of erosion portion has multiscale structure, multiscale structure includes a plurality of edges the axis direction of body distributes be annular slot portion and a plurality of being located the depressed part on the surface of slot portion, slot portion with the size of depressed part is in micro-size scope, wherein, the width scope of slot portion is except.
  2. 2. The valve cartridge for a throttle valve according to claim 1, wherein the cross section of the groove portion is arc-shaped, the width of the cross section of the groove portion is between 2mm and 4mm, the depth of the cross section of the groove portion is between 0.1mm and 0.2mm, and the interval between centers of two adjacent groove portions is between 2mm and 4mm.
  3. 3. The valve element for a throttle valve according to claim 2, wherein the cross-sectional portion of the groove portion is in the shape of a circular arc, the radius of the circular arc is between 1mm and 3mm, and the width of the cross-sectional portion of the groove portion in the shape of a circular arc is between 1mm and 2 mm.
  4. 4. The valve spool for a throttle valve according to claim 2, wherein annular edges of cross sections of adjacent two of the groove portions are connected so that surfaces of the erosion portions form a continuous arc.
  5. 5. The valve cartridge for a throttle valve of claim 1, wherein the depth of the recess is between 20um and 50um, the included angle between the inner sidewall and the bottom wall of the recess is between 120 degrees and 150 degrees, and the diameter of the recess is between 0.5mm and 0.7 mm.
  6. 6. The valve element for a throttle valve according to claim 1, wherein the body further includes a tip end portion on a second end side of the erosion resistant portion, the tip end portion being partially spherical.
  7. 7. The spool for a throttle valve according to claim 1, characterized in that the spool is made of 30CrMo alloy steel or 12Cr18Ni9 alloy steel.
  8. 8. The valve element for a throttle valve according to claim 1, wherein the groove portion is machined by a ball rolling cutter.
  9. 9. The valve cartridge for a throttle valve of claim 1, wherein the recess is formed by laser shock.
  10. 10. A throttle valve, characterized in that the throttle valve comprises: A housing having an inlet and an outlet, a valve seat disposed within the housing, the valve seat having an excess flow passage communicable with the inlet and the outlet, respectively, the valve cartridge of any one of claims 1 to 9 being movable to urge the blocking portion against or separate from the valve seat.
  11. 11. A processing method for a valve element of a throttle valve as recited in claim 1, characterized by comprising the steps of: Processing the bar stock into a connecting part, a plugging part and a conical surface in a turning way; rolling on the conical surface by using a ball rolling cutter to form a plurality of annular groove parts distributed along the axial direction of the body; and (3) performing laser impact on the conical surface by using a laser so as to form a plurality of concave parts on the surface of the groove part.

Description

Valve core for throttle valve, processing method of valve core and throttle valve Technical Field The invention relates to the field of valve design and manufacturing, in particular to a valve core for a throttle valve, a processing method of the valve core and the throttle valve. Background The throttle valve is a core executing element in a fluid conveying and controlling system, and the flow area is changed by adjusting the relative position between the valve core and the valve seat, so that controllable local resistance is formed, and accurate regulation and control of fluid medium pressure and flow parameters are finally realized. In the working process of the throttle valve, the valve core is used as a key component which is directly contacted with fluid and bears the throttling function, and the structural integrity and the working stability of the valve core directly determine the overall working performance and the service life of the throttle valve. In the actual industrial application scene, the fluid medium conveyed by the throttle valve is often not in a pure state, and solid particles with different particle diameters can be doped in the medium under a large number of working conditions. When the valve core and the valve seat form a throttling gap, the fluid can flow at a high speed in the area due to the rapid reduction of the flow area, and solid particles in the medium move along with the high-speed fluid to form continuous impact, cutting and grinding effects on the surface of the valve core. The erosion effect can gradually destroy the surface structure of the valve core, so that the dimensional accuracy of the valve core is reduced, the sealing performance is invalid, finally, the regulating failure of the throttle valve is triggered, the equipment maintenance cost is increased, the continuity of the whole production process can be influenced by sudden faults, and even potential safety hazards are brought. Therefore, the anti-erosion capability of the valve core of the throttle valve is improved, and the valve is a key technical break for solving the problems of short service life, poor operation reliability and the like of the throttle valve. In order to cope with the problem of erosion of the valve core, related technical researches have been carried out in the industry and various solutions have been proposed, wherein the most representative is to use a high-hardness material for valve core manufacturing or surface strengthening. In the aspect of integral application of materials, the technical scheme commonly used at present is to integrally mold the valve core by selecting high-hardness carbide alloy, and the damage of solid particles can be resisted by utilizing the excellent wear resistance and erosion resistance of the carbide alloy. For example, chinese patent application publication No. CN105179714a discloses a method for producing a erosion-resistant and corrosion-resistant high-pressure throttle valve and a combined valve core, which specifically adopts cemented carbide material to manufacture core parts such as a throttle sleeve, a throttle core, a valve seat, etc. which are in direct contact with high-speed flowing gas medium, and realizes the resistance to erosion of high-speed gas flow through the high hardness characteristic of cemented carbide, thereby improving the erosion resistance and corrosion resistance of the parts. However, the technical scheme for manufacturing the valve core by adopting the integral carbide alloy has the inherent defects that firstly, the toughness of the valve core is extremely low due to the mechanical property of a carbide alloy material, equipment in industrial production often vibrates to a certain extent, the integral carbide alloy valve core is extremely easy to generate stress concentration under the vibration working condition so as to generate fracture failure, and the operation stability of the throttle valve is affected, and secondly, the purchase cost and the processing and manufacturing cost of the high-hardness carbide alloy are both at high levels, and the integral cost of the valve is greatly increased due to the integral manufacturing of the valve core by adopting the material. In order to balance the erosion resistance and the manufacturing cost, part of researchers propose a surface strengthening scheme for carrying out carbide alloy spraying on the surface of a common alloy valve core. However, the core short plate of the surface spraying technical scheme is characterized in that the combination property of the coating and the matrix is insufficient, and the metallurgical bonding force between the common alloy matrix and the carbide coating is weak because of the large difference of the material characteristics of the common alloy matrix and the carbide coating, and the coating is very easy to peel from the surface of the matrix under the combined action of high-speed fluid impact and long-term vibration. Once the coating