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CN-121993658-A - Orifice plate and angle valve

CN121993658ACN 121993658 ACN121993658 ACN 121993658ACN-121993658-A

Abstract

The invention relates to the field of valves for controlling fluid, and discloses an orifice plate and an angle valve, wherein the orifice plate is fixedly arranged in a throttling area of an outlet pipeline of the angle valve, the cross section shape and the size of the orifice plate are the same as those of a runner of the outlet pipeline, the orifice plate is based on a dividing line, a plurality of orifices are respectively arranged above and below the dividing line, the dividing line is the horizontal diameter of the orifice plate, the number of the orifices above the dividing line is larger than that below the dividing line, and meanwhile, the orifice aperture above the dividing line is smaller than that below the dividing line. The invention is easy to process and realize in actual production, and can effectively enhance the decompression effect and flow field stability of the valve on the premise of not influencing the design and manufacture of other parts of the angle valve.

Inventors

  • LU HANAN
  • LI HAOYANG
  • LI QIUSHI

Assignees

  • 北京航空航天大学

Dates

Publication Date
20260508
Application Date
20260213

Claims (6)

  1. 1. An orifice plate is characterized in that the orifice plate is fixedly arranged on the inner wall of the outlet end of an outlet pipeline of an angle valve or is butted with the outlet end; the cross section shape and the size of the flow passage of the orifice plate are the same as those of the outlet pipeline, the orifice plate is based on a dividing line, a plurality of orifices are respectively arranged above and below the dividing line, and the dividing line is the horizontal diameter of the orifice plate; The number of the orifices above the dividing line is larger than that below the dividing line, and the aperture of the orifices above the dividing line is smaller than that below the dividing line; The distance between the installation position of the throttle orifice plate in the outlet pipeline and the axis of the valve rod of the angle valve is L, and meanwhile, L is more than or equal to 1.5D and less than or equal to 3D, wherein D is the inner diameter of the outlet pipeline.
  2. 2. The orifice plate of claim 1, wherein the orifice plate has an outer diameter that is the same as an inner diameter of the outlet conduit when the orifice plate is fixedly mounted to an inner wall of the outlet end of the outlet conduit.
  3. 3. The orifice plate of claim 1, wherein the orifice flow passage of the orifice is a curve approaching the dividing line, the curve takes the center of a circle of a central section of a pore canal of the orifice as an origin of coordinates, the axial direction of the orifice plate, namely the main flow direction of fluid, is an X axis, and a curve equation is constructed along the radial Y axis of the orifice plate; wherein the curve equation of the orifice flow passage above the demarcation line is: y = -tanh(μH/D·x); Wherein the curve equation of the orifice flow passage below the dividing line is: y = μH/D·tanh(μH/D·x); In the curve equation, X is the coordinate value on the X axis, Y is the coordinate value on the Y axis, X is more than or equal to 0.5H and less than or equal to 0.5H, H is the thickness of the guide plate, D is the diameter of the outlet pipe diameter, and mu is the scaling factor.
  4. 4. The orifice plate of claim 1, wherein the orifice plate is positioned at a location from the axis L of the valve stem of the angle valve in the orifice region by the formula: ; Where Re is the Reynolds number, m is the base installation threshold, and n is the dynamic compensation value for jet extension.
  5. 5. An orifice plate as set forth in claim 1 wherein the orifice passage is circular in cross-section.
  6. 6. An angle valve, the included angle of inlet and outlet pipelines of which is 90 degrees, characterized in that the orifice plate as set forth in any one of claims 1-5 is fixedly arranged on the outlet pipeline of the angle valve.

Description

Orifice plate and angle valve Technical Field The invention relates to the field of valves for controlling fluid, in particular to an orifice plate and an angle valve. Background The angle valve is used as a common valve form and is widely applied to fluid control systems such as liquid, gas and the like. In the field of pressure reducing valves, the angle valve has better flow control and pressure regulation functions because of the structural characteristic that the valve body of the angle valve is at a 90-degree angle, and plays an important role in industrial application. The working principle is that the flow area of the fluid is controlled by changing the opening between the valve core and the valve seat, so that the adjustment of flow and pressure is realized. The 90-degree flow path design of the angle valve enables the fluid to turn in the valve, is beneficial to guiding and distributing the fluid, and is particularly suitable for pipeline layout with limited installation space. In addition, the angle valve has the advantages of compact structure, good sealing performance, wear resistance and the like, so the angle valve is often used in occasions with certain requirements on pressure control precision. However, the pressure reducing effect of the angle valve is limited to a certain extent by its structural design. Since the fluid path of the angle valve turns 90 degrees, the kinetic energy of the fluid is lost during the turning process. While this helps reduce fluid pressure, for systems requiring higher pressure relief accuracy, the pressure relief effect of a single stage relief angle valve may not be as complex as other designs of relief valves, which may fluctuate under high pressure differential conditions. In addition, the velocity direction of the fluid is turned over at a large angle during the steering process, and additional shear stress is generated. Particularly, under the condition of high-speed flow or high pressure difference, the shearing effect generally causes turbulence and flow separation, so that the pressure fluctuation of a flow field in the pressure reducing valve is large, the flow field is unstable, and finally the control precision of the pressure reducing valve is reduced. Disclosure of Invention Therefore, in order to solve the defects, the invention provides the throttle plate and the angle valve, and the problems of low decompression effect and poor flow field stability of the angle valve under the working condition of high pressure difference and high flow speed can be relieved through the design of the throttle plate. The invention is easy to process and realize in actual production, and can effectively enhance the decompression effect and flow field stability of the valve on the premise of not influencing the design and manufacture of other parts of the angle valve. In one aspect, the invention provides a restrictor plate fixedly mounted on the inner wall of the outlet end of the outlet conduit near the angular valve restrictor region or in butt joint with the outlet end; the cross section shape and the size of the flow passage of the orifice plate are the same as those of the outlet pipeline, the orifice plate is based on a dividing line, a plurality of orifices are respectively arranged above and below the dividing line, and the dividing line is the horizontal diameter of the orifice plate; The number of the orifices above the dividing line is larger than that below the dividing line, and the aperture of the orifices above the dividing line is smaller than that below the dividing line; The distance between the installation position of the throttle orifice plate in the throttle zone and the axis of the valve rod of the angle valve is L, and meanwhile, L is more than or equal to 1.5D and less than or equal to 3D, wherein D is the inner diameter of the outlet pipeline. Optionally, when the orifice plate is fixedly mounted on the inner wall of the outlet end of the outlet pipe, the outer diameter of the orifice plate is the same as the inner diameter of the outlet pipe. Optionally, the orifice flow passage of the orifice is a curve approaching to the dividing line, the curve takes the center of a circle of the central section of the orifice channel as the origin of coordinates, the direction along the axial direction of the orifice, namely the direction of the main flow of the fluid, is the X axis, and the radial direction of the orifice is the Y axis, so as to construct a curve equation; wherein the curve equation of the orifice flow passage above the demarcation line is: y= -tanh(μH/D·x); Wherein the curve equation of the orifice flow passage below the dividing line is: y=μH/D·tanh(μH/D·x); In the curve equation, X is the coordinate value on the X axis, Y is the coordinate value on the Y axis, X is more than or equal to 0.5H and less than or equal to 0.5H, H is the thickness of the guide plate, D is the diameter of the outlet pipe diameter, and mu is the scaling