Built-in throttling arc plate and angle valve

Abstract

The invention discloses a built-in throttling arc plate and an angle valve, the built-in throttling arc plate comprises a plate body, the plate body is vertically installed in an inlet straight pipe section of an outlet pipeline of a pressure reducing valve, the plate surfaces at the 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, and the throttling strips are arranged in the plate body. The throttling strips are arranged in a layered mode at set intervals in the radius direction, throttling channels are formed by the adjacent throttling strips or the throttling strips and the inner wall of the plate body, and the outlet ends of the throttling strips are in an upwarp state in the direction of the inlet ends. On the basis of the horizontal base line of the plate body, the throttling strip located above the horizontal base line is an upper throttling strip, the throttling strip located below the horizontal base line is a lower throttling strip, the molded line of the upper throttling strip is a full curve, and the molded line of the lower throttling strip is a smooth curve. A streamline flow guide curved surface designed in a partition mode is adopted, and the molded line of the streamline flow guide curved surface is defined by a controllable parameter equation. Unnecessary separation and turbulent flow in flowing are reduced, the flow loss can be effectively reduced through the throttling orifice plate, and the energy efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of valve design, specifically to a built-in throttling arc plate and angle valve. Background Technology

[0002] Angle valves, as a common type of valve, are widely used in liquid and gas fluid control systems. In the field of pressure reducing valves, angle valves, due to their unique structural design, possess significant flow control and pressure regulation capabilities, holding an important position in industrial applications. The core working principle of angle valves is similar to other pressure reducing valves: controlling the flow rate and pressure of fluid through the valve by changing the opening between the valve core and the valve seat. Their significant feature lies in the 90-degree turning structure of the valve body, causing a sudden change in fluid direction upon entering and leaving the valve, thereby altering the flow field distribution. Therefore, they offer good flexibility and fluid guiding capability in space-constrained pipeline layouts.

[0003] However, under high pressure differential and high flow velocity conditions, the internal flow field of the flow-opening type high-pressure angle pressure reducing valve exhibits obvious asymmetry and instability. Specifically, after the fluid is throttled by the valve core, it forms a high-speed eccentric jet due to inertia during the 90-degree turn. This jet strongly impacts the upper wall of the outlet pipe, causing continuous erosion and wear in this area, severely affecting the valve's service life and sealing integrity. At the same time, near the lower wall of the outlet pipe, due to the sudden decrease in flow velocity and the abrupt change in flow direction, a large-scale flow separation zone is easily generated, accompanied by vortex shedding and energy dissipation.

[0004] The combined effect of the eccentric jet and the flow separation on the lower side results in severe uneven velocity and pressure distribution within the outlet pipe, leading to poor overall flow field uniformity and easily inducing low-frequency pressure pulsations and vibration noise. Under high pressure differential conditions, this flow field instability is further exacerbated, causing a decrease in the steady-state regulation accuracy of the pressure reducing valve and a deterioration in its dynamic response characteristics, making it difficult to meet the requirements of high-precision pressure control systems. Summary of the Invention

[0005] Therefore, to address the aforementioned shortcomings, this invention provides a built-in throttling arc plate and angle valve. This solves the problems of existing flow-opening high-pressure angle valves under high pressure differential and high flow velocity conditions, where the eccentric jet in the outlet pipe causes severe erosion and wear on the upper wall, significant flow separation on the lower wall, and poor overall flow field uniformity and stability. The built-in throttling arc plate of this invention is installed in the inlet straight section of the pressure reducing valve's outlet pipe, employing a streamlined guide surface with a zoned design. Its profile is defined by controllable parameter equations. By reducing unnecessary separation and turbulence in the flow, the throttling orifice plate can effectively reduce flow losses and improve energy efficiency.

[0006] On one hand, the present invention provides a built-in throttling arc plate, including a plate body, which is vertically installed in the inlet straight pipe section of the outlet pipe of a pressure reducing valve. The plate surfaces at both ends are perpendicular to the axis of the straight pipe section. The plate has several arc-shaped throttling strips. The throttling strips are arranged in layers at a set interval along the radial direction. Adjacent throttling strips or throttling strips and the inner wall of the plate form a throttling channel. The throttling strips are in an upward-curving shape with the outlet end facing the inlet end. Based on the horizontal baseline of the plate, the throttling strip above the horizontal baseline is called the upper throttling strip, and the throttling strip below the horizontal baseline is called the lower throttling strip. The upper throttling strip has a full curve, while the lower throttling strip has a gentle curve.

[0007] Optionally, the full-shape curve fitting equation for the upper throttling bar is as follows: ; in, x These are the coordinates on the X-axis. y These are the Y-axis coordinates, with the node at the inlet of the throttling bar as the origin. The X-axis represents the outflow direction along the outlet pipe, and the Y-axis represents the radial outward direction. a It is a vertical scaling factor greater than zero. b It is the inlet curvature control parameter. c It is the export attenuation parameter.

[0008] The equation for fitting the smooth curve of the lower throttling bar is as follows: ; Where x is the coordinate value of the X-axis and y is the coordinate value of the Y-axis, with the node at the inlet of the throttling bar as the origin. The X-axis is along the outflow direction of the outlet pipe, and the Y-axis is along the radial inward direction. a It is a vertical scaling factor greater than zero. b It is the inlet curvature control parameter. c It is the export attenuation parameter.

[0009] Optionally, there are three upper throttling strips above the horizontal baseline and four lower throttling strips below the horizontal baseline. The spacing between adjacent upper throttling bars is greater than the spacing between adjacent lower throttling bars.

[0010] Optionally, the plate is installed at the inlet straight pipe section at a distance L from the valve stem axis of the pressure reducing valve, with D≤L≤3D, where D is the nominal diameter of the outlet pipe of the pressure reducing valve.

[0011] On the other hand, the present invention provides an angle valve in which the included angle between the inlet and outlet pipes is 90°, and the built-in throttling arc plate is fixedly installed in the straight inlet pipe section of the outlet pipe of the angle valve.

[0012] The present invention has the following advantages: This invention provides a built-in throttling arc plate and angle valve to solve the problems of severe erosion and wear on the upper wall, significant flow separation on the lower wall, and poor overall flow field uniformity and stability in existing flow-opening high-pressure angle valves under high pressure differential and high flow velocity conditions, caused by eccentric jet flow in the outlet pipe. The built-in throttling arc plate of this invention is installed in the inlet straight pipe section of the outlet pipe of the pressure reducing valve and adopts a streamlined guide surface with a zoned design. Its profile is defined by a controllable parameter equation. The upper throttling strip has a full curve profile to guide and disperse the high-speed jet, reducing its impact and erosion on the upper side of the pipe wall; the lower throttling strip has a gentle curve profile to adhere to and reshape the separated flow, suppress vortex generation, and promote flow field recovery.

[0013] This invention, without altering the original structure and interface of the angle valve, achieves active flow rectification through a built-in throttling arc plate, significantly improving the uniformity of velocity and pressure distribution in the outlet pipe, enhancing pressure reduction stability and control accuracy, while also reducing local erosion wear and extending valve service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a pressure reducing valve. Figure 2 This is a velocity contour plot of the flow field of the pressure reducing valve; Figure 3 It is a cloud of streamline distribution in the flow field of the pressure reducing valve; Figure 4 It is the control equation curve of the throttling arc centerline; Figure 5 It is a throttling arc plate structure; Figure 6 This is a cross-sectional schematic diagram of the throttling arc plate; Figure 7 It is a graph showing the curves corresponding to the upper and lower throttling bars; Figure 8 This is a schematic diagram of a pressure reducing valve with an orifice plate installed. In the diagram: 100, plate; 110, upper throttling bar; 120, lower throttling bar; 200, valve stem. Detailed Implementation

[0015] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0016] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0017] As described in the background section, the combined effect of the eccentric jet and the flow separation on the lower side results in severe uneven velocity and pressure distribution within the outlet pipe, leading to poor overall flow field uniformity and easily inducing low-frequency pressure pulsations and vibration noise. Under high pressure differential conditions, this flow field instability is further exacerbated, causing a decrease in the steady-state regulation accuracy of the pressure reducing valve and a deterioration in its dynamic response characteristics, making it difficult to meet the requirements of high-precision pressure control systems.

[0018] For the reasons stated above, this embodiment focuses on a pressure reducing valve, such as... Figure 1 As shown, this pressure-reducing valve is an angle valve with a 90° angle between the inlet and outlet pipes, and is a flow-opening valve. Under high pressure differential and high flow velocity conditions, this valve exhibits engineering problems such as large pressure fluctuations, unstable flow field, and reduced control accuracy.

[0019] like Figure 2 As shown, the flow field velocity contour map of the pressure reducing valve under a certain operating condition was plotted using numerical calculation methods. After the fluid enters the throttling zone formed by the valve core and valve seat from the inlet pipe, the flow velocity increases due to the reduced flow area. Due to the 90° pipe design structure of the angle valve, the fluid undergoes a large angle deflection. The high-speed fluid, due to inertia, forms a high-speed jet that impacts and converges on the upper wall of the outlet pipe, while the fluid velocity near the lower wall of the pipe is lower.

[0020] like Figure 3 The diagram shows the streamlines of the pressure reducing valve. It can be seen that the streamlines are evenly distributed at the inlet pipe, indicating a relatively stable flow field. Turbulence occurs after the fluid enters the throttling zone. After the fluid deflects and enters the outlet pipe, a large separation zone forms near the lower wall of the pipe, creating vortices and causing localized deterioration in fluid flow stability.

[0021] Therefore, this embodiment provides a built-in throttling arc plate, such as Figures 5-8 As shown, it includes a plate 100, which is vertically installed in the inlet straight pipe section of the outlet pipe of the pressure reducing valve. The plate is installed in the inlet straight pipe section at a distance L from the valve stem 200 axis of the pressure reducing valve, with D≤L≤3D, where D is the nominal diameter of the outlet pipe of the pressure reducing valve. The plate surfaces at both ends are perpendicular to the axis of the straight pipe section. The plate has several arc-shaped throttling strips. The throttling strips are arranged in layers at a set interval along the radial direction. Adjacent throttling strips or throttling strips and the inner wall of the plate form a throttling channel. The throttling strips are in an upward-curving shape with the outlet end facing the inlet end. Based on the horizontal baseline of the plate, the throttling strip above the horizontal baseline is called the upper throttling strip 110, and the throttling strip below the horizontal baseline is called the lower throttling strip 120. The upper throttling strip has a full curve, while the lower throttling strip has a gentle curve.

[0022] The full-shape curve fitting equation for the upper throttling bar is as follows: ; The equation for fitting the smooth curve of the lower throttling bar is as follows: ; The guide surface profile is precisely defined by three sets of controllable parameter equations. x These are the coordinates on the X-axis. y These are the Y-axis coordinates, with the node at the inlet of the throttling bar as the origin. The X-axis represents the flow direction along the outlet pipe, and the Y-axis represents the radial direction. The vertical scaling factor is... a ( a >0) Directly determines the guide height, adaptable to the flow field space of pipes with different nominal diameters; inlet curvature control parameter b ( b ∈(0,5]) By adjusting the initial segment fullness, the impact intensity of the jet at different flow velocities is matched; outlet attenuation parameter c ( c ∈(0,1]) controls the descent rate of the tail section to ensure a smooth transition of the fluid to the downstream flow field.

[0023] Based on computational fluid dynamics analysis and numerical simulation verification of the flow field within the valve, the built-in throttling arc plate must be installed within the straight inlet section of the outlet pipe of the pressure reducing valve. Specifically, it should be installed within a range of 1 to 3 times the nominal diameter D of the outlet pipe, with the valve stem axis as the reference, and ensuring that its plate surface is perpendicular to the pipe axis. This location is determined because after the fluid is throttled by the valve core and completes a 90-degree turn, a strong high-speed eccentric jet and initial flow separation are formed precisely in this region. Timely intervention at this critical location can achieve the most effective rectification of the asymmetric flow field with minimal flow resistance, and lay a good foundation for the subsequent pressure recovery process, thereby fundamentally improving the uniformity and stability of the flow field.

[0024] For example, the plate thickness is 10mm, and the outer diameter of the plate is the same as the outer diameter of the pressure reducing valve outlet pipe, which is 46mm. After passing through the throttling zone, the fluid velocity is higher above the outlet pipe and lower below. Therefore, to adapt to the fluid flow field characteristics in different areas, a partitioned non-uniform guide surface is adopted. The profile equation above the pipe is taken as... a =6, b =0.1, c =0.5. The value is taken as 0.5 in the pipe profile equation. a =0.2, b =4, c =0.02 Plot the curve as follows Figure 4 As shown.

[0025] This built-in throttling arc plate features a streamlined arc design, effectively rectifying the fluid flow. The streamlined arc design not only suppresses fluid deviation but also guides the fluid, causing fluid at the edges to move towards the center, thus reducing erosion of the pipe wall. This design optimizes fluid flow characteristics and improves the overall system efficiency. When fluid passes through the throttling zone, changes in velocity and fluid eddies can lead to uneven flow distribution. The built-in throttling arc plate effectively regulates the flow, optimizes the fluid flow path, reduces drastic changes in the fluid within the channel, thereby reducing impact effects and improving the overall fluid flow characteristics. By reducing unnecessary separation and turbulence in the flow, the built-in throttling arc plate effectively reduces flow losses and improves the system's energy efficiency.

[0026] The upper throttling strip adopts a full profile with a large radius. When high-speed fluid impacts this full convex surface, the streamline is forced to bend, the flow channel locally contracts, and part of the fluid's kinetic energy is converted into pressure energy. More importantly, after passing through the convex surface, the fluid is guided to produce a moderate flow direction deflection. At the end of the guide surface, the fluid flow direction tends to be closer to the center of the pipe, which can effectively alleviate the erosion and wear phenomenon caused by eccentric jets.

[0027] The lower throttling strip employs a gentle profile with a small radius. For flow separation vortices present below the pipe, this profile does not forcibly obstruct the fluid, but rather acts as a guide and straightener embedded in the separation zone. Its gentle contour allows the separated streamlines to reattach, guiding the mainstream fluid to smoothly fill the space where the separation vortex resides. This breaks down and stretches large-scale, energy-consuming vortices into a series of tiny vortices that dissipate rapidly. This process converts the ineffective pressure energy contained in the separation vortex into effective pressure recovery, significantly reducing energy loss caused by vortices. Simultaneously, it eliminates vortex-induced vibrations and noise, making the downstream flow field more uniform and stable, and improving the overall energy efficiency and operational smoothness of the system.

[0028] Traditional orifice plates focus on passive throttling, suitable for medium- and low-pressure scenarios with stable operating conditions and low rectification requirements. This invention's throttling arc plate emphasizes active rectification and synergistic throttling, suitable for scenarios with high pressure differentials, high flow velocities, and high requirements for flow uniformity and stability (such as industrial hydraulic systems and high-pressure gas transmission pipelines). Furthermore, for media with high viscosity, the throttling arc plate design is less prone to clogging.

[0029] The key technical feature of this invention is a grid-type throttling arc plate with specific profile characteristics, significantly different from traditional perforated throttling plates. This arc plate is not a simple perforated plate, but rather a continuous, smooth curved surface (upper and lower throttling strips) with differentiated design based on the flow field distribution at the outlet pipe cross-section (high speed above, low speed below). The upper part of the guide surface adopts a full convex profile with a large radius of curvature, while the lower part adopts a gentle profile with a smaller radius of curvature. The two parts achieve a smooth transition through mathematical control equations, together forming a complete streamlined guide structure. This design achieves a fundamental transformation from discrete throttling to continuous rectification, and from a symmetrical structure to an asymmetrical adaptive structure.

[0030] In summary, the built-in throttling arc plate of this invention, through its partitioned streamlined design, can significantly suppress the eccentric jet impact on the upper side wall of the outlet pipe and the flow separation on the lower side wall, thereby effectively improving the uniformity and stability of the flow field and enhancing the control accuracy of the pressure reducing valve. At the same time, it greatly reduces local erosion wear, extends the service life of the valve, reduces flow loss and operating noise, improves system energy efficiency, and its smooth and continuous surface has good anti-clogging characteristics, making it suitable for complex media conditions such as those containing particles or high viscosity.

[0031] In another embodiment, an angle valve is provided, wherein the included angle between the inlet and outlet pipes of the angle valve is 90°, and the built-in throttling arc plate is fixedly installed in the straight inlet pipe section of the outlet pipe of the angle valve.

[0032] This angle valve has all the functions of the aforementioned built-in throttling arc plate.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A built-in throttling arc plate, characterized in that: This includes a plate body, which is vertically installed within the inlet straight pipe section of the pressure reducing valve outlet pipeline. The plate surfaces at both ends are perpendicular to the axis of the straight pipe section. The plate has several arc-shaped throttling strips. The throttling strips are arranged in layers at a set interval along the radial direction. Adjacent throttling strips or throttling strips and the inner wall of the plate form a throttling channel. The throttling strips are in an upward-curving shape with the outlet end facing the inlet end. Based on the horizontal baseline of the plate, the throttling strip above the horizontal baseline is called the upper throttling strip, and the throttling strip below the horizontal baseline is called the lower throttling strip. The upper throttling strip has a full curve, while the lower throttling strip has a gentle curve.

2. The built-in throttling arc plate according to claim 1, characterized in that: The full-shape curve fitting equation for the upper throttling bar is as follows: ； Where x is the coordinate value of the X-axis and y is the coordinate value of the Y-axis, with the node at the inlet of the throttling bar as the origin. The X-axis is along the outflow direction of the outlet pipe, and the Y-axis is along the radial outward direction. a It is a vertical scaling factor greater than zero. b It is the inlet curvature control parameter. c It is the export attenuation parameter.

3. The built-in throttling arc plate according to claim 1, characterized in that: The equation for fitting the smooth curve of the lower throttling bar is as follows: ； in, x These are the coordinates on the X-axis. y These are the Y-axis coordinates, with the node at the inlet of the throttling bar as the origin. The X-axis represents the outflow direction along the outlet pipe, and the Y-axis represents the radial inward direction. a It is a vertical scaling factor greater than zero. b It is the inlet curvature control parameter. c It is the export attenuation parameter.

4. The built-in throttling arc plate according to claim 1, characterized in that: There are three upper throttling strips above the horizontal baseline, and four lower throttling strips below the horizontal baseline. The spacing between adjacent upper throttling bars is greater than the spacing between adjacent lower throttling bars.

5. The built-in throttling arc plate according to claim 1, characterized in that: The plate is installed at the inlet straight pipe section with the valve stem axis of the pressure reducing valve as the reference, and the distance from the valve stem axis is L, where D≤L≤3D, and D is the nominal diameter of the outlet pipe of the pressure reducing valve.

6. An angle valve, wherein the included angle between the inlet and outlet pipes of the angle valve is 90°, characterized in that: An internal throttling arc plate as described in any one of claims 1-5 is fixedly installed in the inlet straight pipe section of the angle valve outlet pipe.

Images