CN-122014904-A - Built-in throttle arc plate and angle valve

CN122014904ACN 122014904 ACN122014904 ACN 122014904ACN-122014904-A

Abstract

The invention discloses a built-in throttling arc plate and an angle valve, wherein the built-in throttling arc plate comprises a plate body, the plate body is vertically arranged in an inlet straight pipe section of an outlet pipeline of a pressure reducing valve, the plate surfaces at two ends of the plate body are perpendicular to the axis of the straight pipe section, a plurality of arc throttling strips are arranged in the plate body in a layered mode at set intervals along the radial direction, adjacent throttling strips or throttling strips and the inner wall of the plate body form throttling channels, the outlet end of each throttling strip is in an upturned mode along the inlet end direction, the throttling strips above the horizontal base line are upper throttling strips, the throttling strips below the horizontal base line are lower throttling strips, the molded lines of the upper throttling strips are full curves, and the molded lines of the lower throttling strips are gentle curves. The invention adopts a streamline diversion curved surface with a partition design, and the molded line is defined by a controllable parameter equation. Unnecessary separation and turbulence in the flow are reduced, and the throttling orifice plate can effectively reduce the flow loss and improve the energy efficiency.

Inventors

LU HANAN
LI HAOYANG
LI QIUSHI

Assignees

北京航空航天大学

Dates

Publication Date: 20260512
Application Date: 20260213

Claims (6)

1. A built-in throttling arc plate is characterized by comprising a plate body which is vertically arranged in an inlet straight pipe section of an outlet pipeline of a pressure reducing valve, The plate surfaces at two ends of the plate body are perpendicular to the axis of the straight pipe section, a plurality of arc-shaped throttling strips are arranged in the plate body, the throttling strips are distributed in a layered mode at set intervals along the radial direction, adjacent throttling strips or throttling strips and the inner wall of the plate body form throttling channels, and the throttling strips take an upturned mode along the inlet end direction by the outlet end; Based on the horizontal base line of the plate body, the throttling strip above the horizontal base line is an upper throttling strip, the throttling strip below the horizontal base line is a lower throttling strip, wherein the molded line of the upper throttling strip is a full-type curve, and the molded line of the lower throttling strip is a gentle type curve.
2. The method of claim 1, wherein the equation for the curve fit of the upper throttle strip is as follows: ; wherein X is the coordinate value of the X axis, Y is the coordinate value of the Y axis, the node at the inlet of the throttling strip is taken as the origin of coordinates, the X axis is along the outflow direction of the outlet pipeline, the Y axis is along the radial outward direction, a is a longitudinal scaling factor larger than zero, b is an inlet curvature regulation parameter, and c is an outlet attenuation parameter.
3. The method of claim 1, wherein the gentle curve fit equation for the lower throttle strip is as follows: ; Wherein X is the coordinate value of the X axis, Y is the coordinate value of the Y axis, the node at the inlet of the throttling strip is taken as the origin of coordinates, the X axis is along the outflow direction of the outlet pipeline, the Y axis is along the radial inward direction, a is a longitudinal scaling factor larger than zero, b is an inlet curvature regulation parameter, and c is an outlet attenuation parameter.
4. The built-in throttle arc plate of claim 1, wherein the upper throttle strip above the horizontal base line is three layers, and the lower throttle strip below the horizontal base line is four layers; the spacing between adjacent upper throttle strips is greater than the spacing between adjacent lower throttle strips.
5. The plate of claim 1, wherein the plate body is mounted on the inlet straight pipe section at a distance L, D≤L≤3D from the axis of the valve rod based on the axis of the valve rod of the pressure reducing valve, wherein D is the nominal diameter of the outlet pipe of the pressure reducing valve.
6. An angle valve, the included angle of an inlet pipeline and an outlet pipeline of which is 90 degrees, is characterized in that the built-in throttle arc plate as set forth in any one of claims 1-5 is fixedly arranged in an inlet straight pipe section of an outlet pipeline of the angle valve.

Description

Built-in throttle arc plate and angle valve Technical Field The invention relates to the field of valve design, in particular to a built-in throttling arc plate and an angle valve. Background The angle valve is used as a common valve form and is widely applied to liquid and gas fluid control systems. In the field of pressure reducing valves, the angle valve has remarkable flow control capacity and pressure regulating function due to the unique structural design, and plays an important role in industrial application. The core working principle of the angle valve is similar to that of other pressure reducing valves, and the flow rate and pressure of fluid passing through the valve are controlled by changing the opening between the valve core and the valve seat. The valve is characterized in that the 90-degree steering structure of the valve body causes the fluid to have abrupt change of direction when entering and leaving the valve, thereby changing the flow field distribution, and therefore, the valve has better flexibility and fluid guiding capability in the space-limited pipeline layout. However, under the working condition of high pressure difference and high flow rate, the internal flow field of the flow opening type high-pressure angle type pressure reducing valve has obvious asymmetry and instability characteristics. The valve is characterized in that after the fluid is throttled by the valve core, high-speed eccentric jet flow is formed due to inertia in the 90-degree steering process, and the jet flow strongly impacts the upper side wall surface of the outlet pipeline, so that the area is subjected to continuous erosion and abrasion, and the service life and sealing integrity of the valve are seriously affected. At the same time, in the vicinity of the lower side wall surface of the outlet pipe, a large-scale flow separation region is liable to occur due to rapid decrease in flow velocity and rapid change in flow direction, and vortex shedding and energy dissipation are accompanied. The combined action of the eccentric jet flow and the separation of the lower side flow ensures that the flow field in the outlet pipeline presents serious uneven speed and pressure distribution, the uniformity of the whole flow field is poor, and low-frequency pressure pulsation and vibration noise are easy to induce. Under the condition of high pressure difference, the instability of the flow field is further aggravated, so that the steady-state adjusting precision of the pressure reducing valve is reduced, the dynamic response characteristic is deteriorated, and the requirement of a high-precision pressure control system is difficult to meet. Disclosure of Invention Therefore, in order to solve the defects, the invention provides a built-in throttling arc plate and an angle valve, which solve the problems that the erosion and abrasion of the upper wall surface are serious, the flow separation of the lower wall surface is obvious and the uniformity and the stability of the whole flow field are poor due to eccentric jet flow in an outlet pipeline under the working conditions of high pressure difference and high flow rate of the existing flow opening type high-pressure angle type pressure reducing valve. Unnecessary separation and turbulence in the flow are reduced, and the throttling orifice plate can effectively reduce the flow loss and improve the energy efficiency. In one aspect, the invention provides a built-in throttle arc plate, comprising a plate body vertically arranged in an inlet straight pipe section of an outlet pipeline of a pressure reducing valve, The plate surfaces at two ends of the plate body are perpendicular to the axis of the straight pipe section, a plurality of arc-shaped throttling strips are arranged in the plate body, the throttling strips are distributed in a layered mode at set intervals along the radial direction, adjacent throttling strips or throttling strips and the inner wall of the plate body form throttling channels, and the throttling strips take an upturned mode along the inlet end direction by the outlet end; Based on the horizontal base line of the plate body, the throttling strip above the horizontal base line is an upper throttling strip, the throttling strip below the horizontal base line is a lower throttling strip, wherein the molded line of the upper throttling strip is a full-type curve, and the molded line of the lower throttling strip is a gentle type curve. Optionally, the equation of the filled curve fit of the upper throttle stripe is as follows: ; wherein X is the coordinate value of the X axis, Y is the coordinate value of the Y axis, the node at the inlet of the throttling strip is taken as the origin of coordinates, the X axis is along the outflow direction of the outlet pipeline, the Y axis is along the radial outward direction, a is a longitudinal scaling factor larger than zero, b is an inlet curvature regulation parameter, and c is an outlet attenuation paramete