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CN-122014887-A - Valve core with composite guide structure, safety valve comprising valve core and working method of safety valve

CN122014887ACN 122014887 ACN122014887 ACN 122014887ACN-122014887-A

Abstract

A valve core with a composite guide structure, a safety valve comprising the valve core and a working method of the safety valve belong to the technical field of safety valves. The valve core is a integrally processed and formed revolving body, the sealing end of the valve core body is a spherical sealing surface, the outer side wall is a valve clack guiding surface and an oil storage tank, and the upper end is a spring guiding surface. The outer end of the spherical sealing surface is a cutting plane, the inner diameter of the shell is in clearance fit with the guide surface of the valve clack, one end of the spring is sleeved outside the guide surface of the valve core in a clearance mode, the other end of the spring is connected with the inner wall of the shell in an assembling mode, and the chamfer of the shell is attached to the spherical sealing surface of the valve core. The invention ensures the coaxiality of valve core movement, solves the problems of large vibration and unstable sealing performance of a pure spherical valve core, improves the repeated precision of pressure control, enhances the sealing reliability, reduces erosion and abrasion and prolongs the service life.

Inventors

  • LI JIANGHUI
  • YOU LIXIN
  • LOU BENHONG
  • LU ZHENGDONG
  • WANG YANG

Assignees

  • 哈尔滨东安实业发展有限公司

Dates

Publication Date
20260512
Application Date
20260131

Claims (9)

  1. 1. A valve core with a composite guide structure is characterized in that the valve core is a integrally machined rotary body and comprises a valve core body (1), a sealing end of the valve core body (1) is a spherical sealing surface (5), the outer end of the spherical sealing surface (5) is a cutting plane, the spherical sealing surface (5) is used for being matched with a chamfer angle of a shell (8) to achieve sealing, one side, adjacent to the spherical sealing surface (5), of the outer side wall of the valve core body (1) is a valve clack guide surface (4) used for being matched with the inner diameter of the shell (8), one side, far away from the spherical sealing surface (5), of the outer side wall of the valve core body (1) is provided with an oil storage groove (6), the oil storage groove (6) is used for storing lubricating media, and the upper end of the valve core body (1) is provided with a spring guide surface used for being matched with the inner diameter of a spring (7) to achieve radial positioning of the spring (7).
  2. 2. The valve cartridge with the composite guide structure according to claim 1, wherein the spring guide surface comprises an initial guide surface (2) of a spherical surface and a top guide surface (3) of a cylindrical surface which are arranged up and down.
  3. 3. A valve cartridge with a composite guide structure according to claim 2, characterized in that the radius of the initial guide surface (2) is SR4.15.
  4. 4. The valve core with the composite guide structure according to claim 1, wherein the number of the oil storage grooves (6) is at least one, and when the number of the oil storage grooves (6) is more than one, all the oil storage grooves (6) are arranged in parallel along the axial direction of the valve core body (1).
  5. 5. A safety valve with a valve core of a composite guide structure according to claim 3 is characterized by comprising a shell (8), a spring (7) and a valve core, wherein the inner diameter of the shell (8) is in clearance fit with a valve clack guide surface (4) of the valve core, one end of the spring (7) is in clearance fit with the outer side of the spring guide surface of the valve core, the other end of the spring (7) is connected with the inner wall of the shell (8) in an assembling mode, and a chamfer angle of the shell (8) is attached to a spherical sealing surface (5) of the valve core.
  6. 6. The relief valve of claim 5 wherein said spring guide surface has a surface roughness of 1.6.
  7. 7. The safety valve according to claim 6, wherein the chamfer angle of the housing (8) is 45 ° -60 °, and the surface roughness of the chamfer is not more than 1.6.
  8. 8. The safety valve according to claim 7, characterized in that the outer diameter of the top guide surface (3) is calculated as follows: step one, calculating the pitch diameter of the spring in a free state : Wherein: indicating the outer diameter of the spring in the free state; representing the diameter of the section of the spring steel wire; Step two, calculating the inner diameter of the spring in the free state : Step three, calculating the change amount of the inner diameter of the spring : Wherein: Representing the pitch of the spring, wherein, Representing the coefficients; Step four, calculating the inner diameter of the spring under the state of pressing and combining : Calculating the outer diameter of the top guiding surface (3) : Wherein: The clearance between the inner diameter and the top guide surface (3) in the state of spring compression is shown.
  9. 9. A method of operating a safety valve according to claim 8, comprising the steps of: s1, sleeving a spring (7) into a spring guide surface of a valve core along the axial direction, and ensuring that the axis of the spring (7) coincides with the movement axis of the valve core; s2, mounting a valve core provided with a spring (7) from one end of a shell (8), enabling a valve clack guide surface (4) of the valve core to be matched with the inner diameter of the shell (8), and filling a lubricating medium into an oil storage tank (6); s3, when the system pressure does not exceed a set value, the elastic force of the spring (7) acts on the valve core to enable the spherical sealing surface (5) to be tightly attached to the chamfer angle of the shell (8) so as to realize system sealing; s4, when the system pressure exceeds a set value, the pressure acts on the spherical sealing surface (5) through fluid to generate thrust and overcome the elastic force of the spring (7) to push the valve core to move axially, the spring (7) is compressed, and the fluid is decompressed through a gap between the valve core and the shell (8); and S5, when the system pressure is reduced below a set value, the elastic restoring force of the spring (7) pushes the valve core to axially restore, the spherical sealing surface (5) is attached to the chamfer angle of the shell (8) again, and the safety valve restores to a sealing state.

Description

Valve core with composite guide structure, safety valve comprising valve core and working method of safety valve Technical Field The invention relates to a valve core with a composite guide structure, a safety valve comprising the valve core and a working method of the safety valve, and belongs to the technical field of safety valves. Background In the field of aerospace, a safety valve is a core device for guaranteeing safe operation of a lubricating oil pump system. The working principle of the lubricating oil pump is that when the lubricating oil pressure at the inlet of the safety valve exceeds a rated value, the valve is automatically opened, so that the inlet of the lubricating oil pump is communicated with the outlet of the lubricating oil pump, the pressure of the outlet of the lubricating oil pump is reduced to the pressure relief pressure within a limited time, the balance of the whole pressure difference of the lubricating oil pump system is further maintained, and the safe and stable operation of the lubricating system is ensured. The core performance of the safety valve needs to meet four key requirements, namely accurate opening pressure, rapid opening and closing response, tight sealing performance and long-term working reliability. However, the valve core design in the prior art generally has performance contradiction, and has the defects that when a steel ball is adopted as a pure spherical valve core, the steel ball has good self-centering property, but lacks an effective guiding structure, the problems of large vibration amplitude and high vibration frequency are presented in the test process, after repeated cyclic tests, the sealing performance of a safety valve is unstable, the repeated precision of pressure control is poor, when a plunger valve core is adopted, the guiding performance is improved, but the sealing surface is extremely sensitive to eccentric wear and has the defect of larger flow resistance, and in addition, the traditional bottom guiding valve core is easy to generate erosive wear even if the guiding surface can ensure excellent centering, and is easy to generate clamping stagnation phenomenon when in thermal expansion or impurity invasion, thereby seriously affecting the reliability of valve action. Disclosure of Invention In order to solve the problems in the background art, the invention provides a valve core with a composite guide structure, a safety valve comprising the valve core and a working method of the safety valve. The valve core with the composite guide structure comprises a valve core body, a sealing end of the valve core body is a spherical sealing surface, the outer end of the spherical sealing surface is a cutting plane, the spherical sealing surface is used for being matched with a chamfer angle of a shell to realize sealing, one side, adjacent to the spherical sealing surface, of the outer side wall of the valve core body is a valve clack guide surface used for being matched with the inner diameter of the shell, an oil storage groove is formed in one side, far away from the spherical sealing surface, of the outer side wall of the valve core body, and is used for storing lubricating media, and the upper end of the valve core body is a spring guide surface used for being matched with the inner diameter of a spring to realize radial positioning of the spring. Further, the spring guide surface includes an initial guide surface of a spherical surface and a top guide surface of a cylindrical surface disposed up and down. Further, the radius of the initial guiding surface is SR4.15. Further, the number of the oil storage tanks is at least one, and when the number of the oil storage tanks is greater than one, all the oil storage tanks are arranged in parallel along the axial direction of the valve core body. The invention relates to a safety valve with a valve core of a composite guide structure, which comprises a shell, a spring and a valve core, wherein the inner diameter of the shell is in clearance fit with a valve clack guide surface of the valve core, one end of the spring is in clearance fit with the outer side of the spring guide surface of the valve core, the other end of the spring is connected with the inner wall of the shell in an assembling way, and a chamfer of the shell is attached to a spherical sealing surface of the valve core. Further, the surface roughness of the spring guide surface is 1.6. Further, the chamfering angle of the shell is 45 degrees to 60 degrees, and the surface roughness of the chamfer is not more than 1.6. Further, the calculation process of the outer diameter of the top guide surface is as follows: step one, calculating the pitch diameter of the spring in a free state : Wherein: indicating the outer diameter of the spring in the free state; representing the diameter of the section of the spring steel wire; Step two, calculating the inner diameter of the spring in the free state : Step three, calculating the change amount