A method for alleviating bias flow erosion and wear of high pressure angle valve

Abstract

The present invention discloses a method for alleviating the erosion and wear of bias flow of a high-pressure angle valve, wherein the high-pressure valve comprises a valve seat, and an outlet portion of the valve seat comprises a tubular expansion section, and at least one guide plate is fixedly arranged on a designated side of an inner wall of the expansion section, and the guide plate extends along the outlet direction of the expansion section, and the upper and lower ends of the guide plate extend to the inlet end and the outlet end of the expansion section respectively; the designated side is the opposite side of the inlet of the high-pressure angle valve; the radial height of the guide plate increases with the increase of the diameter of the expansion tube, and the radial height is the extension height of the guide plate pointing to the central axis of the expansion section; the present invention installs the guide plate on the designated side of the expansion section of the L-shaped angle valve (the opposite side of the inlet of the high-pressure angle valve), and through the guiding effect of the guide plate, the direct impact of the fluid on the pipe wall is reduced, the wear is effectively reduced, and the service life of the equipment is extended, and at the same time, the flow path of the fluid is improved through the guide plate, the generation of eddy currents and secondary flows is reduced, and the efficiency of fluid flow is improved.

Description

Technical Field

[0001] The invention relates to the field of valves, in particular to a method for alleviating bias flow erosion and wear of a high-pressure angle valve. Background Art

[0002] Angle valve is a key fluid control equipment, which is widely used in the industrial field, covering multiple industries such as petroleum, chemical, electric power, nuclear power and aerospace. Its main functions include fluid control, backflow prevention, emergency shut-off, etc. The structural design of angle valve usually includes main parts such as valve body, valve stem, valve seat and valve core, and the specific structure may vary depending on the application requirements. The valve body of a typical angle valve is L-shaped. This design allows the fluid to turn at a 90-degree angle, thereby realizing the diversion and control functions of the fluid in a limited space. However, a major problem faced by such L-shaped angle valves during use is eccentric flow erosion and wear. Eccentric flow erosion and wear refers to the eccentric jet generated by the change of flow velocity and flow direction when the fluid passes through the valve, which in turn causes lateral impact and wear on the internal surface of the valve body. This phenomenon is particularly serious in high-pressure and high-speed fluid environments, which increases the failure rate of equipment and extremely reduces the service life, which has an adverse impact on the safety and economic benefits of industrial systems. Summary of the invention

[0003] Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a method for alleviating the bias flow erosion wear of the high-pressure angle valve, which includes installing a guide plate on the designated side (opposite to the inlet of the high-pressure angle valve) of the expansion section (primary expansion section) of the L-shaped angle valve. Through the guiding effect of the guide plate, the direct impact of the fluid on the pipe wall is reduced, the wear is effectively reduced, and the service life of the equipment is extended. At the same time, the guide plate improves the flow path of the fluid, reduces the generation of vortices and secondary flows, and improves the efficiency of fluid flow.

[0004] Specifically, a method for alleviating bias flow erosion and wear of a high-pressure angle valve, the high-pressure valve having a valve seat, a tubular expansion section at the outlet of the valve seat, at least one guide plate fixedly arranged on a designated side of the inner wall of the expansion section, the guide plate extending along the outlet direction of the expansion section, the upper and lower ends of the guide plate extending to the inlet end and the outlet end of the expansion section respectively; the designated side is the opposite side of the inlet of the high-pressure angle valve;

[0005] The radial height of the guide plate increases as the diameter of the expansion tube increases, and the radial height is the extension height of the guide plate pointing to the central axis of the expansion section.

[0006] Optionally, two guide plates are fixedly provided on a designated side of the inner wall of the expansion section, and the two guide plates are arranged along the circumference of the expansion section;

[0007] The included angle between the two guide plates is sixty degrees.

[0008] Optionally, three guide plates are fixedly provided on a designated side of the inner wall of the expansion section, and the three guide plates are arranged along the circumference of the expansion section;

[0009] The included angle between adjacent guide plates is thirty degrees.

[0010] Optionally, the radial height of the upper end of the guide plate is determined by the following formula:

[0011] L0=0.25D0;

[0012] Where L0 is the radial height of the upper end of the guide plate, and D0 is the inlet diameter of the expansion section;

[0013] The radial height of the lower end of the guide plate is determined by the following formula:

[0014] L1=0.25D1;

[0015] Among them, L1 is the radial height of the lower end of the guide plate, and D1 is the outlet diameter of the expansion section.

[0016] Optionally, guide channels extending along the central axis of the expansion section are respectively arranged on both sides of the guide plate, and the guide channels on both sides are arranged on opposite sides.

[0017] Optionally, guide channels are respectively arranged on both sides of the guide plate at 0.2L0, 0.4L0, 0.6L0 and 0.8L0, wherein L0 is the radial height of the upper end of the guide plate.

[0018] Optionally, the flow guide groove is of a flared type, and the flared width increases as the diameter of the expansion tube increases.

[0019] The present invention has the following advantages:

[0020] The present invention is a method for alleviating the bias flow erosion and wear of a high-pressure angle valve, and the method includes installing a guide plate on a designated side (opposite to the inlet of the high-pressure angle valve) of the expansion section (primary expansion section) of the L-shaped angle valve. The guiding effect of the guide plate reduces the direct impact of the fluid on the pipe wall, effectively reduces wear and tear, and extends the service life of the equipment. At the same time, the guide plate improves the flow path of the fluid, reduces the generation of eddies and secondary flows, and improves the efficiency of fluid flow. By reducing the uneven erosion of the pipe wall by the fluid, the stability and reliability of the entire fluid delivery system are enhanced. Since the wear of the pipe wall is reduced, the frequency of valve maintenance and replacement is reduced, and the maintenance cost is reduced. In addition, the present invention is easy to process and implement, and can effectively alleviate the bias flow erosion and wear of the high-pressure angle valve without affecting the design and manufacture of other components, thereby extending the service life and reducing safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the structure of the high-pressure angle valve;

[0022] Figure 2 is a two-dimensional schematic diagram of the guide plate size;

[0023] Figure 3 A schematic diagram of a cross-sectional view of the installation of the guide plate;

[0024] Figure 4 The velocity distribution cloud diagram of the meridian plane of angle valves with different structures;

[0025] Figure 5 The three-dimensional high-speed fluid velocity distribution diagram of angle valves with different structures;

[0026] Figure 6 The meridian streamline distribution cloud diagram for angle valves with different structures;

[0027] Figure 7 It is a symmetrical pressure monitoring line;

[0028] Figure 8 The pressure drop change of the flow field in the left and right areas of angle valves with different structures;

[0029] Fig. 9 Schematic diagram of a guide plate with guide grooves (embodied in the form of grooves);

[0030] Fig.10 The guide groove is presented in the form of a groove, showing the schematic diagram of the inlet and outlet structure at present;

[0031] Fig.11 Schematic diagram of a guide plate with a guide channel (embodied in the form of a through hole);

[0032] Fig.12 Schematic diagram of the inlet and outlet structure when the diversion channel is embodied in the form of a through hole;

[0033] In the figure: 1. valve cover; 2. valve stem; 3. valve body; 4. valve seat; 5. valve core; 6. guide plate; 61. guide channel; 7. expansion section. DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0035] In this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus.

[0036] As described in the background technology, one of the main problems faced by L-shaped angle valves during use is eccentric flow erosion wear. Eccentric flow erosion wear refers to the eccentric jet generated by the change of flow velocity and flow direction when the fluid passes through the valve, which in turn causes lateral impact and wear on the internal surface of the valve body. This phenomenon is particularly serious in high-pressure and high-speed fluid environments, which increases the equipment failure rate and extremely reduces the service life, and has an adverse impact on the safety and economic benefits of industrial systems.

[0037] Based on the above reasons, this embodiment provides a method for alleviating the erosion and wear of the high-pressure angle valve. Figure 1 and Figure 2 As shown, the high-pressure angle valve includes a valve cover 1, a valve stem 2, a valve body 3, an inlet, a valve seat 4, a valve core 5 and an expansion section 7; the valve body and the valve cover constitute the pressure-bearing components of the angle valve, and they are important components to ensure the integrity of the flow boundary of the medium inside the valve. The valve body is the main outer shell structure of the valve, which bears the pressure of the medium fluid and ensures the normal flow path and sealing performance of the fluid. The valve cover is located at one end of the valve body, forming a closed structure with the valve body, and also plays a role in supporting and protecting the internal mechanism of the valve. The valve core and the valve seat constitute the throttling element of the angle valve, which are located inside the valve and are mainly responsible for controlling the flow of the medium. Specifically, the valve core is a moving component inside the valve, and its position determines the flow area of ​​the medium that can pass through the valve. The valve seat is a fixed component corresponding to the valve core to ensure the sealing performance of the valve core when it moves and the stable operation of the valve. The valve stem and the actuator constitute the driving element of the angle valve. The valve stem is a component connecting the valve handle or actuator with the valve core, and the valve is opened or closed by driving the valve core. The upper end expansion pipe of the downstream outlet can form a multi-stage expansion section to achieve the purpose of deceleration and pressure expansion. In order to alleviate the serious erosion and wear of the wall surface on the opposite side of the inlet of the expansion section (especially the first-stage expansion section); the method for alleviating the erosion and wear of the high-pressure angle valve bias flow is to fix at least one guide plate 6 on the designated side of the inner wall of the expansion section 7 (especially the first-stage expansion section), and the guide plate extends along the outlet direction of the expansion section. The upper and lower ends of the guide plate extend to the inlet and outlet ends of the expansion section respectively; the designated side is the opposite side of the inlet of the high-pressure angle valve (such as Figure 2 right side shown);

[0038] The radial height of the guide plate increases as the diameter of the expansion tube increases, and the radial height is the extension height of the guide plate pointing to the central axis of the expansion section.

[0039] The above technical features can alleviate the erosion and wear of the expansion section caused by the deviation flow of the high-pressure angle valve. Through the guiding effect of the guide plate, the direct impact of the fluid on the wall of the expansion section is reduced, which effectively reduces the wear and extends the service life of the angle valve. At the same time, the guide plate improves the flow path of the fluid in the expansion section, reduces the generation of eddy currents and secondary flows, and improves the flow efficiency of the fluid in the expansion section. By reducing the uneven erosion of the fluid on the wall of the expansion section pipeline, the stability and reliability of the entire fluid delivery system are enhanced.

[0040] At the same time, the radial height of the guide plate increases as the diameter of the expansion tube increases (forming a trapezoidal shape, such as Figure 2 The expanded tube (shown in the section line) can better adapt to the change of the expansion tube diameter, and can also effectively guide the flow direction of the fluid, reduce the direct impact of the fluid on the pipe wall, thereby reducing wear.

[0041] For example, Figure 3 As shown, two or three guide plates are fixedly arranged on a designated side of the inner wall of the expansion section, and the plurality of guide plates are arranged circumferentially along the expansion section; when two guide plates are arranged, the angle between the two guide plates is sixty degrees, as shown in FIG. Figure 3 As shown in (a); Preferably, three guide plates are provided in the expansion section, and the angle between adjacent guide plates is thirty degrees, such as Figure 3 As shown in (b).

[0042] Although the erosion wear is alleviated by designing the guide plate, if the radial height of the guide plate is not designed reasonably, it is easy to cause the blockage problem of the expansion section; therefore, in order to solve this problem, in one embodiment, the radial height of the upper end of the guide plate is determined by the following formula:

[0043] L0=0.25D0;

[0044] Where L0 is the radial height of the upper end of the guide plate, and D0 is the inlet diameter of the expansion section;

[0045] The radial height of the lower end of the guide plate is determined by the following formula:

[0046] L1=0.25D1;

[0047] Among them, L1 is the radial height of the lower end of the guide plate, and D1 is the outlet diameter of the expansion section.

[0048] The above technical features utilize the inlet and outlet diameters of the expansion section to respectively determine the radial heights of the upper and lower ends of the guide plate, thereby ensuring that the radial height of the guide plate is as small as possible compared to the diameter of the expansion section, thereby ensuring that the guide plate has little impact on the flow capacity of the valve flow channel (mainly the expansion section) after installation, and is not prone to causing pipeline blockage problems.

[0049] In order to further illustrate the effect of the above guide plate, through the disassembly and flaw detection of the high-pressure angle valve after wear and numerical simulation calculation results, it is found that the serious erosion and wear in the expansion section is mainly concentrated in a certain angle area in the direction of the inlet opposite side wall. Figure 3 The present invention adopts two installation schemes and further describes them.

[0050] Solution 1:

[0051] In order to maximize the coverage of the area susceptible to erosion, two guide plates are installed. The two plates are symmetrical about the XZ plane, with an angle of 60° between them, and are installed on the right wall (Z>0) of the first expansion section.

[0052] Option 2:

[0053] In order to further reduce the flow area of ​​the fluid in the right side (opposite to the inlet of the high-pressure angle valve), increase the pressure recovery rate in the local area, and make the fluid distribution more uniform, two guide plates are installed. The three plates are symmetrical about the XZ plane, with an angle of 30° between adjacent plates. They are installed on the right side (Z>0) wall of the first expansion section.

[0054] In order to verify the effects of different schemes on eccentric jet suppression, numerical simulation method is used to compare and analyze them.

[0055] like Figure 4 Shown is the meridian velocity distribution cloud diagram of high-pressure angle valves with different structures. Figure 4 (a) shows an angle valve without a guide plate. In the first expansion section, due to the asymmetric adverse pressure gradient and viscous force, a large vortex area is generated on the left side. The generation of this vortex will intensify the generation of eccentric jets and cause serious erosion and wear. Figure 4 (b) shows an angle valve with two guide plates installed. The separation area on the left side is reduced, and separation also occurs on the right side. The asymmetric flow state of the fluid on the left and right sides is alleviated, but there is still a certain eccentric jet phenomenon. Figure 4 In (c), the angle valve with two guide plates installed has a large separation on both sides of the first expansion section. The high-speed fluid is mainly concentrated at the axis position, and the eccentric jet phenomenon is greatly alleviated. This phenomenon shows that installing the guide plate on the right side has a certain rectification and obstruction effect on the high-speed fluid, thereby suppressing the generation of eccentric jets.

[0056] like Figure 5The figure shows the three-dimensional distribution of high-speed fluids with internal velocities greater than 100m / s in angle valves of different structures. It can be seen that the pressure difference between the inlet and outlet of the high-pressure angle valve is large, and the flow velocity increases rapidly after the fluid passes through the throttling area due to the reduction of the flow area. In addition, due to the special structure of the angle valve, the fluid will have a large angle deflection, resulting in the following Figure 5 The severe asymmetric eccentric jet phenomenon shown in (a) is shown in Figure 1. The high-speed fluid continuously impacts the opposite side of the inlet, causing severe erosion and wear on the side wall. Figure 5 (b) shows that after installing two guide plates, high-speed fluid will also scour the wall at the entrance of the first-stage expansion section, but it is alleviated in the downstream area. Figure 5 Middle (c) shows that after installing three guide plates, it can be seen that the high-speed jet is mainly concentrated in the center of the pipe, which greatly reduces the scouring effect of the high-speed eccentric jet.

[0057] Figure 6 Meridian streamline distribution of angle valves with different structures. Figure 6 In (a), it can be seen that the angle valve without guide plates has a larger separation zone on the left. Due to the adverse pressure gradient and higher viscosity, a larger clockwise vortex is generated, which has a certain exclusion effect on the fluid in the right area, resulting in a serious eccentric jet phenomenon. After installing two guide plates on the right side, Figure 6 As shown in (b), a small vortex is generated in the guide plate area, the left separation area is reduced, and the eccentric jet is alleviated to a certain extent. After installing three guide plates, Figure 6 As shown in (c), the separation area on the right side increases, while the separation area on the left side decreases, and the scouring on the right wall is reduced.

[0058] like Figure 7 As shown, two symmetrical monitoring lines L and R are established near the wall of the straight section A of the high-pressure angle valve seat and the first-stage expansion section B. The pressure distribution at the symmetrical position of the flow field of angle valves with different structures is compared by extracting the pressure values ​​on the monitoring lines.

[0059] like Figure 8 The figure shows the pressure changes along the flow direction of the monitoring lines L and R. It can be seen that the pressure of the fluid drops rapidly after passing through the throttling area, and the flow area increases after entering the straight section of the valve seat and the expansion section, and the pressure gradually recovers. Due to the eccentric jet phenomenon, the angle valve without a guide plate generates more vortices on the left side, and the high-speed fluid is concentrated in the right area, resulting in large pressure fluctuations on the monitoring line L and relatively stable pressure changes on the monitoring line R. After the guide plate is installed in the expansion section, the pressure fluctuations in the straight section of the valve seat and the left side of the inlet of the first-stage expansion section are reduced, and the pressure recovery speed in the right area of ​​the first-stage expansion section is increased, which can better balance the asymmetric pressures on the left and right sides.

[0060] From the local streamline distribution diagram of angle valves with different structures ( Figure 6 ) and pressure distribution diagram ( Figure 8) It can be seen that although installing three guide plates can better alleviate the eccentric jet phenomenon, it will cause the local flow instability to increase, the turbulence intensity to increase, the pressure fluctuation to increase, the local flow resistance loss to increase, and also bring greater noise; In order to solve this problem, such as Fig. 9 and Fig.11 As shown, in one embodiment, guide channels 61 extending along the central axis of the expansion section are respectively provided on both sides of the guide plate 6, and the guide channels 61 on both sides are arranged on opposite sides. Preferably, guide channels are respectively provided at 0.2L0, 0.4L0, 0.6L0, and 0.8L0 on both sides of the guide plate, wherein L0 is the radial height of the upper end of the guide plate; the guide flow groove is a flared type, and the flared width increases with the increase of the diameter of the expansion tube. Optionally, the bottom width of the guide channel inlet is L0 / 13, and the bottom width of the guide channel outlet is 2L0 / 13.

[0061] The guide channel in the above technical features can rectify the unstable flow in the local area (especially the guide plate wall in the expansion section), effectively guide the fluid to flow along the predetermined path, improve the flow stability of the fluid, and reduce flow noise and energy loss. The expansion structure gradually increases the flow area, so that the fluid gradually expands during the flow process, thereby reducing turbulence and eddy currents in the flow. When the fluid flows through the guide channel, the velocity will gradually decrease and the pressure will gradually increase; this pressure diffusion effect helps to balance the pressure distribution of the fluid during the flow process, reduce the phenomenon of local excessive flow velocity or low pressure, thereby improving the stability and reliability of the entire system, and also can reduce structural damage or uneven flow caused by excessive flow velocity. The use of the guide channel can not only maintain the strength of the structure, but also reduce the overall weight of the plate. Without affecting the guide performance, it effectively reduces the amount of material used, thereby reducing the weight of the overall structure and improving the efficiency and economy of the system.

[0062] In one embodiment, the guide channel may be a groove starting from the side of the guide plate, such as Fig. 9 and Fig.10 As shown, the walls on both sides of the groove form an angle of 140° with the bottom surface. The groove allows the fluid to flow into the groove better, reduces the resistance of the fluid when entering the groove, and allows the fluid to be more evenly distributed in the groove, thereby improving the flow efficiency of the fluid. It can also reduce the separation of the fluid at the entrance of the groove, which may lead to energy loss and unstable flow. By reducing separation, the transmission efficiency of the fluid can be improved.

[0063] In one embodiment, the guide channel may be a through hole starting from both sides of the guide plate, such as Fig.11 and Fig.12 As shown, the walls on both sides of the through hole form an angle of 140° with the bottom surface, and the distance between the outer wall of the channel and the wall of the guide plate is L0 / 65.

[0064] By setting an expansion-shaped guide channel structure on the guide plate, it can play many roles such as fluid rectification, deceleration and pressure expansion, and reducing structural weight, thereby optimizing the flow characteristics of the fluid, reducing fluid disturbance, making the fluid flow more stable, reducing turbulence, and improving the overall performance and economy of the system.

[0065] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for alleviating bias flow erosion wear of a high-pressure angle valve, wherein the high-pressure angle valve has a valve seat, and a tubular expansion section is provided at the outlet of the valve seat, characterized in that: Two or three guide plates arranged along the circumference of the expansion section are fixedly provided on the designated side of the inner wall of the expansion section, the guide plates extend along the outlet direction of the expansion section, and the upper and lower ends of the guide plates extend to the inlet end and the outlet end of the expansion section respectively; the designated side is the opposite side of the inlet of the high-pressure angle valve; The radial height of the guide plate increases as the diameter of the expansion section increases, and the radial height is the extension height of the guide plate pointing to the central axis of the expansion section; On both sides of the guide plate, flow guide channels extending along the central axis of the expansion section are respectively arranged, and the flow guide channels on both sides are arranged on opposite sides; the flow guide channels are flared, and the flared width increases with the increase of the diameter of the expansion section; The radial height of the upper end of the guide plate is determined by the following formula: L 0 =0.25 D 0 ； in, L 0 is the radial height of the upper end of the guide vane, D 0 is the inlet diameter of the expansion section; The radial height of the lower end of the guide plate is determined by the following formula: L 1 =0.25 D 1 ； in, L 1 is the radial height of the lower end of the guide plate, D 1 is the outlet diameter of the expansion section.

2. According to claim 1, a method for alleviating bias flow erosion and wear of a high-pressure angle valve is characterized by: Two guide plates are fixedly arranged on a designated side of the inner wall of the expansion section, and the two guide plates are arranged along the circumference of the expansion section; The included angle between the two guide plates is sixty degrees.

3. According to claim 1, a method for alleviating bias flow erosion and wear of a high-pressure angle valve is characterized by: Three guide plates are fixedly arranged on a designated side of the inner wall of the expansion section, and the three guide plates are arranged along the circumference of the expansion section; The included angle between adjacent guide plates is thirty degrees.

4. A method for alleviating bias flow erosion and wear of a high-pressure angle valve according to any one of claims 1 to 3, characterized in that: The two sides of the guide plate are provided with guide channels at 0.2 L0, 0.4 L0, 0.6 L0 and 0.8 L0 respectively, wherein: L 0 is the radial height of the upper end of the guide vane.

5. According to the method for alleviating bias flow erosion and wear of a high-pressure angle valve as described in claim 1, the guide channel is a groove or a through hole.

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