A regulating valve

Abstract

This application discloses a regulating valve, belonging to the field of fluid control valves. The valve head of the valve stem has a curved profile that varies along the axial direction, and a guide portion extending axially is provided on the outer circumferential surface of the valve head to guide the valve head to maintain centering contact with the valve seat within the stroke range of the valve stem. The valve seat includes a positioning section and a disassembly section. The positioning section has a cylindrical structure for positioning in conjunction with the inner wall of the valve body, and the disassembly section has a conical structure, the diameter of which gradually decreases along the side away from the valve body. A support portion is provided in the inner cavity of the valve body, located on the side of the valve seat near the valve body outlet end, and has a through hole for the valve stem to pass through, thereby increasing the support rigidity of the valve stem. This application solves the problems of existing on / off valves, such as the inability to continuously and accurately regulate flow, easy vibration of the valve stem, difficulty in disassembling and maintaining the valve seat, and poor valve head alignment.

Description

Technical Field

[0001] This application relates to the field of fluid control valve technology, and more particularly to a regulating valve. Background Technology

[0002] In the feed systems of reactors in the chemical and petrochemical industries, it is often necessary to precisely adjust the flow rate of the medium in the conveying pipeline in order to accurately control the mixing ratio of various raw materials added to the reactor in order to ensure reaction stability and product quality.

[0003] Taking PTA slurry conveying as an example, existing technologies often use on / off valves to control the flow of the medium. However, traditional on / off valves only have two working states: open or closed, and cannot continuously and precisely adjust the flow rate of the medium according to actual process requirements. When the process requires the valve to have flow regulation capabilities and be able to stop stably at any position within its stroke range to match different flow requirements, the existing on / off valve structure obviously cannot meet the requirements.

[0004] Furthermore, media such as PTA slurry typically contain solid particles, presenting harsh operating conditions. When ordinary on / off valves operate under these conditions for extended periods, especially when the valve is frequently at a small opening, the following problems can easily occur: the valve stem wears or erodes rapidly due to the impact of solid particles, increasing the risk of external leakage; the valve head sealing surface becomes misaligned when closed due to poor guidance, causing sealing leaks; the valve seat wobbles within the bottom flange due to poor positioning, and disassembly becomes difficult due to media adhesion; and the valve stem vibrates violently at small openings, affecting the overall valve stability and service life.

[0005] Therefore, there is an urgent need to design a regulating valve that is specifically designed for conveying solid-containing slurries such as PTA slurry, and has good regulating performance and high reliability. Utility Model Content

[0006] This application provides a regulating valve that solves the problems mentioned in the background art.

[0007] This application provides a regulating valve, including a valve body, a valve seat installed at the outlet end of the valve body, a valve stem movably inserted into the valve body along the axial direction, and a driving device for driving the valve stem to move axially. The valve head of the valve stem has a curved profile that varies along the axial direction, and a guide portion extending axially is provided on the outer circumferential surface of the valve head. The guide portion is used to guide the valve head to maintain centering contact with the valve seat within the stroke range of the valve stem. The valve seat includes a positioning section and a disassembly section. One end of the positioning section is connected to the disassembly section. The positioning section has a cylindrical structure and is used to cooperate with the inner wall of the valve body for positioning. The disassembly section has a conical structure, and the diameter of the conical structure gradually decreases along the side away from the valve body. A support portion is provided in the inner cavity of the valve body. The support portion is located on the side of the valve seat near the outlet end of the valve body, and a through hole is opened on the support portion for the valve stem to pass through. The valve stem passes through the through hole and cooperates with the valve seat. The support portion is used to increase the support stiffness of the valve stem in the direction of medium flow.

[0008] In one possible implementation, the outer wall of the valve stem is provided with an isolation protective sleeve; the isolation protective sleeve is located above the stuffing gland of the valve body and is used to physically isolate the surface of the valve stem from the medium flowing through the valve.

[0009] In one possible implementation, the support portion is provided with multiple concave structures in the circumferential direction to increase the flow area of ​​the medium.

[0010] In one possible implementation, the regulating valve further includes a locking assembly; the end of the valve stem away from the valve seat and the output end of the drive device are connected through the locking assembly; the locking assembly has an internal thread, the valve stem and the output end of the drive device are respectively provided with external threads that mate with the internal thread, and a clearance is reserved at the joint between the valve stem and the output end of the drive device for on-site adjustment of the axial position of the valve stem.

[0011] In one possible implementation, the locking assembly includes two mating locking elements; the outer wall of the valve stem is provided with a square structure for manual adjustment with a tool.

[0012] In one possible implementation, the regulating valve further includes an anti-rotation part; a guide rod is provided between the valve body and the driving device; the anti-rotation part is disposed on the outer wall of the locking assembly and is slidably connected to the guide rod.

[0013] In one possible implementation, the curved profile of the valve head is a tapered guide surface with at least two varying slopes along the axial direction, wherein the slope at the proximal end is greater than the slope at the distal end along the valve opening direction.

[0014] In one possible implementation, the height of the disassembly segment is greater than the height of the positioning segment.

[0015] One or more technical solutions provided in the embodiments of this application have at least the following technical effects:

[0016] The regulating valve provided in this application embodiment, by setting a valve head with a curved profile that varies along the axial direction, allows the valve head to form different medium flow areas at different stroke positions when the driving device drives the valve stem to move axially, thereby achieving precise flow regulation and solving the problem that existing regulating valves cannot continuously regulate flow. A guide portion set on the outer circumference of the valve head and extending axially guides the valve head and valve seat to maintain centering contact throughout the entire stroke of the valve stem, avoiding sealing leakage caused by poor guidance. By setting the valve seat as a structure combining a cylindrical positioning section and a conical disassembly section, the positioning section cooperates with the inner wall of the valve body to prevent valve seat swaying, and the diameter of the disassembly section gradually decreases along the side away from the valve body to facilitate on-site installation and disassembly, solving the problems of poor valve seat positioning and disassembly difficulties caused by medium adhesion. By setting a support portion on the side of the valve seat near the valve body outlet end, and allowing the valve stem to pass through a through hole in the support portion, the support stiffness of the valve stem in the medium flow direction is increased, effectively suppressing severe vibration of the valve stem under small opening conditions, and improving the overall stability and service life of the valve. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the regulating valve provided in an embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the internal structure of the valve body provided in an embodiment of this application;

[0020] Figure 3 for Figure 2 A schematic diagram of the AA cross-section;

[0021] Figure 4 This is a schematic diagram of the valve seat provided in an embodiment of this application;

[0022] Figure 5 This is a schematic diagram of the anti-rotation part provided in an embodiment of this application;

[0023] Figure 6 This is a schematic diagram of the structure of the guide section provided in an embodiment of this application.

[0024] Icons: 1-Valve body; 2-Valve seat; 21-Positioning section; 22-Disassembly section; 3-Valve stem; 31-Isolation protective sleeve; 32-Square structure; 4-Drive device; 5-Valve head; 6-Guide part; 7-Support part; 71-Concave structure; 8-Locking assembly; 81-Locking element; 9-Anti-rotation part; 10-Guide rod; 11-Nut. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0027] This application provides a regulating valve, such as Figures 1 to 6As shown. The regulating valve includes a valve body 1, a valve seat 2 installed at the outlet end of the valve body 1, a valve stem 3 movably inserted into the valve body 1 along the axial direction, and a drive device 4 for driving the valve stem 3 to move axially. The valve head 5 of the valve stem 3 has a curved profile that varies along the axial direction, and a guide portion 6 extending axially is provided on the outer circumferential surface of the valve head 5. The guide portion 6 is used to guide the valve head 5 to maintain centering contact with the valve seat 2 within the stroke range of the valve stem 3. The valve seat 2 includes a positioning section 21 and a disassembly section 22. One end of the positioning section 21 is connected to the disassembly section 22. The positioning section 21 has a cylindrical surface structure and is used to cooperate with the inner wall of the valve body 1 for positioning. The disassembly section 22 has a conical surface structure, and the diameter of the conical surface structure gradually decreases along the side away from the valve body 1. The valve body 1 has a support part 7 in its inner cavity. The support part 7 is located on the side of the valve seat 2 near the outlet end of the valve body 1. The support part 7 has a through hole for the valve stem 3 to pass through. The valve stem 3 passes through the through hole and cooperates with the valve seat 2. The support part 7 is used to increase the support rigidity of the valve stem 3 in the direction of medium flow.

[0028] Furthermore, a guide portion 6 extending axially is provided on the outer circumferential surface of the valve head 5. Specifically, the guide portion 6 consists of four guide ribs evenly distributed circumferentially along the valve head 5. Throughout the entire axial stroke of the valve stem 3, the guide portion 6 maintains a sliding connection with the inner wall of the valve seat 2, thereby guiding the valve head 5 and the valve seat 2 to always be in a centered contact state when the valve stem 3 moves, effectively avoiding sealing leakage or uneven wear of the valve seat 2 caused by the misalignment of the valve head 5.

[0029] It should be noted that the regulating valve provided in this application embodiment, by setting a valve head 5 with a curved profile that varies along the axial direction, allows the valve head 5 to form different medium flow areas at different stroke positions when the driving device 4 drives the valve stem 3 to move axially, thereby achieving precise flow regulation and solving the problem that existing on / off valves cannot continuously regulate flow. The guide portion 6, set on the outer circumference of the valve head 5 and extending axially, guides the valve head 5 to maintain centering contact with the valve seat 2 throughout the entire stroke range of the valve stem 3, avoiding sealing leakage caused by poor guidance. By setting the valve seat 2 as a cylindrical surface... The structure combining the positioning section 21 and the conical disassembly section 22 allows the positioning section 21 to cooperate with the inner wall of the valve body 1 to prevent the valve seat 2 from swinging. The diameter of the disassembly section 22 gradually decreases along the side away from the valve body 1 to facilitate on-site installation and disassembly, thus solving the problems of poor positioning of the valve seat 2 and difficulty in disassembly due to medium adhesion. By setting a support part 7 on the side of the valve seat 2 near the outlet end of the valve body 1 and allowing the valve stem 3 to pass through the through hole on the support part 7, the support stiffness of the valve stem 3 in the direction of medium flow is increased, effectively suppressing the severe vibration of the valve stem 3 under small opening conditions, and improving the overall stability and service life of the valve.

[0030] In this embodiment, an isolation protective sleeve 31 is provided on the outer wall of the valve stem 3. The isolation protective sleeve 31 is located above the stuffing box of the valve body 1 and is used to physically isolate the surface of the valve stem 3 from the medium flowing through the valve, effectively avoiding direct scouring and wear of the valve stem 3 by the solid medium and reducing the risk of external leakage of the valve.

[0031] In this embodiment, the support part 7 is provided with a plurality of concave structures 71 in the circumferential direction, which increases the medium flow area while ensuring the support rigidity of the valve stem 3, and effectively reduces the flow resistance of the medium when it flows through the support part 7.

[0032] In this embodiment, the regulating valve further includes a locking assembly 8. The end of the valve stem 3 furthest from the valve seat 2 and the output end of the drive device 4 are connected via the locking assembly 8. The locking assembly 8 has an internal thread, and the output ends of the valve stem 3 and the drive device 4 are respectively provided with external threads that mate with the internal threads. A clearance is reserved at the joint between the valve stem 3 and the output ends of the drive device 4 for on-site adjustment of the axial position of the valve stem 3. This achieves a reliable connection between the valve stem 3 and the output ends of the drive device 4, and also facilitates flexible on-site adjustment of the initial axial position of the valve stem 3.

[0033] In this embodiment, the locking assembly 8 includes two interlocking locking members 81. The outer wall of the valve stem 3 is provided with a square structure 32 for manual adjustment with tools, allowing for manual adjustment of the valve opening on-site without disassembling the entire device, thus improving the convenience of debugging and maintenance.

[0034] In this embodiment, the regulating valve further includes an anti-rotation part 9. A guide rod 10 is provided between the valve body 1 and the driving device 4; the anti-rotation part 9 is disposed on the outer wall of the locking assembly 8 and slidably connected to the guide rod 10. Specifically, the guide rod 10 is provided with a boss, and the anti-rotation part 9 is provided with a groove corresponding to the boss. This arrangement, through the sliding cooperation between the anti-rotation part 9 and the guide rod 10, effectively restricts the circumferential rotation of the locking assembly 8 during the movement of the valve stem 3.

[0035] Furthermore, a nut 11 is provided on the outer wall of the valve stem 3, which is used to lock the valve stem 3 to prevent it from loosening.

[0036] In this embodiment, the curved profile of the valve head 5 is a conical guide surface with at least two varying slopes along the axial direction. Along the valve opening direction, the slope at the near end is greater than the slope at the far end, so that the valve achieves rapid flow response in the initial opening stage (small opening degree) due to the larger slope, and achieves fine flow regulation in the later opening stage (large opening degree) due to the smaller slope.

[0037] Specifically, in this embodiment, the curved profile of the valve head 5 is formed by connecting ten tapered guide surfaces with different slopes in sequence, which further refines the corresponding curve between flow rate and opening degree, improves the adjustment accuracy and linearity throughout the entire stroke range, and meets the requirements for precise control of the mixing ratio of the feed into the reactor.

[0038] Specifically, the slope of each segment can be determined through experimental calibration based on the valve diameter and flow characteristic curve, and will not be listed here.

[0039] This application increases the guide length of the conical structure by setting the height of the disassembly section 22 to be greater than the height of the positioning section 21 (specifically, the height of the disassembly section 22 is 5 times the height of the positioning section 21), effectively reducing the disassembly resistance caused by medium adhesion, and allowing the valve seat 2 to be easily removed from the outlet end of the valve body 1, thereby improving the convenience of on-site maintenance.

[0040] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0041] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A regulating valve, comprising a valve body (1), a valve seat (2) mounted at the outlet end of the valve body (1), a valve stem (3) axially movably inserted in the valve body (1), and a driving device (4) for driving the valve stem (3) to move axially, characterized in that, The valve head (5) of the valve stem (3) has a curved profile that varies along the axial direction, and a guide portion (6) extending along the axial direction is provided on the outer peripheral surface of the valve head (5). The guide portion (6) is used to guide the valve head (5) and the valve seat (2) to maintain center contact within the stroke range of the valve stem (3). The valve seat (2) includes a positioning section (21) and a disassembly section (22). One end of the positioning section (21) is connected to the disassembly section (22). The positioning section (21) is a cylindrical structure used to cooperate with the inner wall of the valve body (1) for positioning. The disassembly section (22) is a conical structure, and the diameter of the conical structure gradually decreases along the side away from the valve body (1). The valve body (1) has a support part (7) in its inner cavity. The support part (7) is located on the side of the valve seat (2) near the outlet end of the valve body (1). The support part (7) has a through hole for the valve stem (3) to pass through. The valve stem (3) passes through the through hole and cooperates with the valve seat (2). The support part (7) is used to increase the support stiffness of the valve stem (3) in the direction of medium flow.

2. The regulating valve according to claim 1, characterized in that The outer wall of the valve stem (3) is provided with an isolation protective sleeve (31); The isolation sleeve (31) is located above the stuffing box of the valve body (1) and is used to physically isolate the surface of the valve stem (3) from the medium flowing through the valve.

3. The regulating valve according to claim 1, characterized in that, The support part (7) is provided with multiple concave structures (71) in the circumferential direction to increase the flow area of ​​the medium.

4. The regulating valve according to claim 1, characterized in that, It also includes a locking component (8); The end of the valve stem (3) away from the valve seat (2) and the output end of the drive device (4) are connected by the locking assembly (8); The locking assembly (8) has an internal thread, and the output ends of the valve stem (3) and the drive device (4) are respectively provided with external threads that mate with the internal thread. The output ends of the valve stem (3) and the drive device (4) have a gap reserved at the joint for adjusting the axial position of the valve stem (3) on site.

5. The regulating valve according to claim 4, characterized in that, The locking assembly (8) includes two locking members (81) that abut against each other. The outer wall of the valve stem (3) is provided with a square structure (32) for manual adjustment with the help of tools.

6. The regulating valve according to claim 5, characterized in that, It also includes the anti-rotation part (9); A guide rod (10) is provided between the valve body (1) and the drive device (4). The anti-rotation part (9) is disposed on the outer wall of the locking assembly (8) and is slidably connected to the guide rod (10).

7. The regulating valve according to claim 1, characterized in that, The curved profile of the valve head (5) is a conical guide surface with at least two varying slopes along the axial direction, with the slope at the near end being greater than that at the far end along the valve opening direction.

8. The regulating valve according to claim 1, characterized in that, The height of the disassembly section (22) is greater than the height of the positioning section (21).

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