Stain-resistant multi-stage single-seat valve core regulating valve structure
By employing a combination design of multi-stage throttling sections and throttling orifices in the valve core regulating valve, the problems of fluid cavitation and impurity blockage at the valve are solved, achieving uniform dispersion of fluid pressure difference and effective removal of impurities, thereby improving the operational stability and lifespan of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-16
- Publication Date
- 2026-03-27
AI Technical Summary
In existing technologies, fluids are prone to cavitation and blockage by impurities at valves, which can damage valve internals, reduce production efficiency, and increase maintenance costs.
A fouling-resistant multi-stage single-seat valve core regulating valve structure is designed, which adopts a combination of multiple throttling sections and throttling orifices. The sidewalls of the throttling sections form inclined surfaces to disperse pressure differentials and avoid impurity accumulation. The fluid flows tangentially and forms vortices or high-speed shear flow, reducing noise and impurity deposition.
It effectively disperses fluid pressure differential, avoids local stress concentration in the valve core, extends service life, reduces noise and impurity deposition, improves production efficiency, and reduces maintenance costs.
Smart Images
Figure CN224049802U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to fluid control technical field, especially relate to a kind of anti-fouling multistage single seat valve core regulating valve structure. BACKGROUND
[0002] At present, power plant, steel plant often encounter some fluid pressure difference, many impurities in the working condition. Fluid flows through valve and can produce cavitation, while the impurities in medium can block flow passage, valve internals are seriously damaged, valve core hole is blocked and other problems, and further reduce production efficiency, improve maintenance cost. SUMMARY
[0003] The present application is aimed at the shortcomings of the prior art, and provides an anti-fouling multistage single seat valve core regulating valve structure to solve the technical problems of frequent damage of valve internals and blockage of valve core hole in the prior art.
[0004] The anti-fouling multistage single seat valve core regulating valve structure provided by the embodiment of the present application mainly comprises a valve body assembly and a valve core. The valve body assembly has a fluid passage, and the fluid passage comprises a plurality of throttle holes connected in series. The valve core is rod-shaped and comprises a plurality of throttle segments arranged in the axial direction, and the plurality of throttle segments correspond to the plurality of throttle holes in sequence. The valve core can move along the axis of the valve core, and the valve core moves in a first direction to achieve the cutoff of the fluid passage. The valve core moves in a second direction to achieve the conduction of the fluid passage. The first direction and the second direction are opposite. The projection area of the plurality of throttle segments in the axial direction decreases in sequence along the first direction, the side wall of the throttle segment forms at least one throttle inclined surface, and the throttle inclined surface is inclined towards the first direction and the axis of the valve core.
[0005] As an optional embodiment, the throttle inclined surfaces of adjacent throttle segments are arranged in axial displacement.
[0006] As an optional embodiment, the distance between the end of the throttle inclined surface of the plurality of throttle segments and the end of the corresponding throttle hole in the axial direction decreases in sequence along the first direction.
[0007] As an optional embodiment, the projection area of the plurality of throttle holes in the axial direction decreases in sequence along the first direction.
[0008] As an optional embodiment, the anti-fouling multistage single seat valve core regulating valve structure further comprises a hard alloy layer, which covers the inner wall of the throttle hole.
[0009] As an optional implementation, the valve body assembly comprises a valve body, the valve body has a mounting cavity inside, and a shell wall of the valve body forms a fluid inlet and a fluid outlet in communication with the mounting cavity; the valve body assembly further comprises a valve cover, a pressure cage, a sleeve and a valve seat connected in sequence; the valve seat, the sleeve and at least part of the pressure cage are mounted in the mounting cavity and connected with the valve body, and the valve cover is arranged outside the valve body; the valve cover, the pressure cage, the sleeve and the valve seat all have hollow structures and the hollow structures of the four are in communication to form a valve core channel, the valve core channel is in communication with the mounting cavity to form the fluid channel, and the valve core is assembled in the valve core channel and moves along the valve core channel.
[0010] As an optional implementation, the mounting cavity comprises a first cavity and a second cavity in communication; the first cavity is in communication with the fluid inlet; the second cavity is in communication with the fluid outlet, the valve seat is assembled in the first cavity, and the hollow structure of the valve seat forms the plurality of throttling holes; the pressure cage and the sleeve are both assembled in the second cavity, the sleeve is in a columnar shape, and a side wall of the sleeve is provided with a side hole in communication with the inside and outside of the hollow structure of the sleeve.
[0011] As an optional implementation, the anti-fouling multi-stage single seat valve core regulating valve structure further comprises a first sealing member sealing the connection between the valve body and the valve seat.
[0012] As an optional implementation, the anti-fouling multi-stage single seat valve core regulating valve structure further comprises a second sealing member sealing the connection between the valve body and the pressure cage.
[0013] As an optional implementation, the valve core comprises a threaded valve rod and a throttling body, and a cylindrical pin penetrating the valve rod and the throttling body; the throttling body comprises a plurality of throttling sections connected in sequence; the valve rod and the throttling body are fixed against rotation by the cylindrical pin.
[0014] The application provides an anti-fouling multi-stage single seat valve core regulating valve structure, and the technical scheme provided by the embodiments of the application at least brings the following beneficial effects:
[0015] The fluid flows through the plurality of throttling sections, each throttling section generates a local pressure drop, the structure of the plurality of throttling sections disperses the pressure difference, the valve core is subjected to more uniform force, and cracks or deformation caused by local stress concentration are avoided. The design of the throttling bevel avoids right-angle or groove structures, eliminates "dead corners" for impurity accumulation, can also make the fluid flow tangentially to form a vortex or high-speed shear flow to flush the particles that may be deposited, and the throttling bevel can also guide the fluid to turn gently to reduce turbulence and vortex separation and reduce noise generated by fluid impact on the valve core.
[0016] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application, as claimed. BRIEF DESCRIPTION OF DRAWINGS
[0017] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the references to the figures, in which:
[0018] Figure 1 A schematic diagram of an anti-fouling multi-stage single seat valve core regulating valve structure provided for an embodiment of the present application;
[0019] Figure 2 A schematic diagram of the position relationship of a valve seat, a throttling hole and a hard alloy layer in an anti-fouling multi-stage single seat valve core regulating valve structure provided for an embodiment of the present application;
[0020] Figure 3 A schematic diagram of the position relationship of a valve body, a mounting cavity, a fluid inlet and a fluid outlet in an anti-fouling multi-stage single seat valve core regulating valve structure provided for an embodiment of the present application;
[0021] Figure 4 A schematic diagram of the structure of a valve core in an anti-fouling multi-stage single seat valve core regulating valve structure provided for an embodiment of the present application.
[0022] Corresponding explanations of the reference signs:
[0023] 1: valve body assembly; 11: throttling hole; 12: valve body; 13: mounting cavity; 131: first cavity; 132: second cavity; 14: valve cover; 15: pressure cage; 16: sleeve; 17: valve seat; 18: valve core passage;
[0024] 2: valve core; 21: throttling section; 22: throttling inclined surface; 23: valve stem; 24: throttling body; 25: cylindrical pin.
[0025] 3: hard alloy layer;
[0026] 4: first sealing element;
[0027] 5: second sealing element;
[0028] A: fluid inlet;
[0029] B: fluid outlet. DETAILED DESCRIPTION
[0030] The present application is described in detail below, examples of embodiments of the present application are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar components or components having the same or similar functions throughout. In addition, if a detailed description of known technology is unnecessary for the features of the present application shown, it is omitted. The embodiments described below by reference to the accompanying drawings are exemplary and are for the purpose of explaining the present application only, and cannot be interpreted as a limitation on the present application.
[0031] Those skilled in the art can understand that, unless specifically stated, the singular forms "a", "an" and "the" used herein also include the plural forms. It should be further understood that the use of the phrase "comprising" in the specification of the present application means that the features, elements and / or components are present, but do not exclude the presence or addition of one or more other features, elements, components and / or their components. The phrase "and / or" used herein includes all or any single unit and all combinations of the associated listed items.
[0032] The anti-fouling multi-stage single seat valve core regulating valve structure provided by the embodiments of the present application is suitable for power plant equipment, steel plant equipment and equipment that often encounters high pressure difference, large flow and medium containing many impurities.
[0033] As shown in Figures 1-4 The anti-fouling multi-stage single seat valve core regulating valve structure mainly includes a valve body assembly 1 and a valve core 2. The valve body assembly 1 has a fluid passage including a plurality of throttle holes 11 connected in communication; the valve core 2 is rod-shaped and includes a plurality of throttle sections 21 arranged in the axial direction, which correspond to the plurality of throttle holes 11 in sequence; the valve core 2 is movable along the axis of the valve core 2, and the valve core 2 is moved in a first direction to achieve fluid passage cutoff; the valve core 2 is moved in a second direction to achieve fluid passage conduction; the first direction and the second direction are opposite; wherein the projection area of the plurality of throttle sections 21 in the axial direction decreases in sequence along the first direction, the side wall of the throttle section 21 forms at least one throttle inclined surface 22, and the throttle inclined surface 22 is inclined to the first direction and to the axis of the valve core 2.
[0034] In the present embodiment, the anti-fouling multi-stage single seat valve core regulating valve structure is arranged in the horizontal plane. The valve body assembly 1 is in communication with the fluid source, and the fluid can flow through the valve body assembly 1. The axial direction of the valve core 2 is the same as the arrangement direction of the plurality of throttle holes 11, and the valve core 2 and the plurality of throttle holes 11 are both arranged vertically.
[0035] The relative position of the throttling segments 21 and the throttling holes 11 is changed to adjust the fluid 24 channel to be in a cut-off state or a conducting state. If the fluid channel is in the cut-off state, there is a throttling segment 21 in each throttling hole 11, and the corresponding throttling segment 21 and the throttling hole 11 are in sealing connection, so that the fluid is cut off at the throttling hole 11; if the fluid channel is in the conducting state, the corresponding throttling segment 21 is separated from the throttling hole 11, and the fluid passes through the space between the throttling segment 21 and the throttling hole 11 from bottom to top to flow through the throttling hole 11.
[0036] The plurality of throttling segments 21 are arranged at the lower end of the valve core 2. It is assumed that the aforementioned first direction is downward and the second direction is upward. When the valve core 2 moves downward, the corresponding throttling segment 21 and the throttling hole 11 are close to each other until they are in sealing connection, so that the fluid channel is cut off; when the valve core 2 moves upward, the corresponding throttling segment 21 and the throttling hole 11 are far away from each other, so that the fluid channel is conducted.
[0037] The projection area of the throttling segment 21 located at the upper side in the axial direction is greater than the projection area of the throttling segment 21 located at the lower side in the axial direction; for example, there are three throttling segments 21, which are the first throttling segment 21, the second throttling segment 21 and the third throttling segment 21 from top to bottom, respectively, the projection area of the first throttling segment 21 in the axial direction is the largest, the projection area of the second throttling segment 21 in the axial direction is the second, and the projection area of the third throttling segment 21 in the axial direction is the smallest.
[0038] The side surface of each throttling segment 21 has at least one throttling slope 22 extending along the axial direction of the valve rod 23. When there are a plurality of throttling slopes 22, the plurality of throttling slopes 22 are uniformly arranged on the throttling segment 21 to ensure the dynamic stability of the valve core 2. Optionally, the throttling slope 22 is a plane. The throttling slope 22 is inclined downward to the axis of the valve core 2, that is, the throttling slope 22 is inclined downward and inward.
[0039] The anti-fouling multi-stage single-seat valve core regulating valve structure provided by the embodiment has the following advantages: the fluid flows through the plurality of throttling segments 21, each throttling segment 21 generates a local pressure drop, the structure of the plurality of throttling segments 21 disperses the fluid pressure difference, the valve core 2 is subjected to more uniform force, cracks or deformation caused by local stress concentration are avoided, and the service life is prolonged. The design of the throttling slope 22 avoids the structure of a right angle or a groove, eliminates the "dead angle" of impurity accumulation, can also make the fluid flow tangentially, forms a vortex or a high-speed shear flow, flushes the particles that may be deposited, and the throttling slope 22 can also guide the fluid to turn gently, reduces the turbulence and vortex separation, and reduces the noise generated by the fluid impacting the valve core 2.
[0040] As shown in FIGS. 1, 2 and 3, the throttling slope 22 of each throttling segment 21 is arranged in the axial direction. Figure 1 4 As an optional embodiment, the throttling slopes 22 of adjacent throttling segments 21 are arranged in the axial direction.
[0041] With the above scheme, the misalignment of the throttle bevel 22 causes the fluid to change direction multiple times, increasing the flow length and prolonging the energy dissipation time. The misalignment of the throttle bevel 22 can also cause lateral shear force on the bevel, assisting in peeling off the attached particles. When the fluid changes direction, a local high-speed area is formed, achieving scouring and avoiding continuous accumulation of impurities at the same location.
[0042] As an optional embodiment, the distance from the end of the throttle bevel 22 of each throttle section 21 to the end of the corresponding throttle hole 11 decreases in the first direction.
[0043] Based on the foregoing embodiments, in this embodiment, the valve core 2 has three throttle sections 21, from top to bottom, the first throttle section 21, the second throttle section 21, and the third throttle section 21. The valve body assembly 1 has three throttle holes 11, from top to bottom, the first throttle hole 11, the second throttle hole 11, and the third throttle hole 11. When the fluid passage is in the closed state, the first throttle section 21 is located in the first throttle hole 11 and the two are in sealed connection, the second throttle section 21 is located in the second throttle hole 11 and the two are in sealed connection, the third throttle section 21 is located in the third throttle hole 11 and the two are in sealed connection, the first throttle hole 11, the second throttle hole 11, and the third throttle hole 11 cannot be connected, and the fluid cannot pass through the first throttle hole 11, the second throttle hole 11, and the third throttle hole 11; when the fluid passage is in the open state, the first throttle section 21 is separated from the first throttle hole 11, the first throttle hole 11, the second throttle hole 11, and the third throttle hole 11 are connected, and the fluid can pass through the third throttle hole 11, the second throttle hole 11, and the first throttle hole 11 in turn.
[0044] Since the fluid flows from bottom to top, the end of the throttle bevel 22 and the end of the throttle hole 11 are both upper ends, and the head of the throttle bevel 22 and the head of the throttle hole 11 are both lower ends, that is, both the end of the throttle bevel 22 and the end of the throttle hole 11 are related to the flow direction of the fluid. The throttle section 21 and the throttle hole 11 are both cylindrical, the end of the throttle bevel 22 and the end of the throttle hole 11 are not connected, and the end of the throttle bevel 22 and the end of the throttle hole 11 are both the widest part of the throttle section 21; the head of the throttle bevel 22 and the head of the throttle hole 11 are connected, and the end of the throttle bevel 22 and the end of the throttle hole 11 are both the narrowest part of the throttle section 21.
[0045] The distance from the end of the throttling slope 22 of the first throttling section 21 to the end of the first throttling orifice 11 is the largest, the distance from the end of the throttling slope 22 of the second throttling section 21 to the end of the second throttling orifice 11 is the second largest, and the distance from the end of the throttling slope 22 of the third throttling section 21 to the end of the third throttling orifice 11 is the smallest. This ensures that the fluid passage is open when the valve core 2 moves upward to the minimum opening distance, guaranteeing the effective operation of the equipment. The minimum opening distance is the distance from the end of the throttling slope 22 of the throttling section 21 with the largest projected area in the axial direction to the end of the corresponding throttling orifice 11. In this embodiment, the minimum opening distance is the distance from the end of the throttling slope 22 of the topmost first throttling section 21 to the end of the first throttling orifice 11.
[0046] like Figure 1 and 4 As shown, as an optional implementation, the projected area of the plurality of throttling orifices 11 in the axial direction decreases sequentially along the first direction.
[0047] Based on the aforementioned embodiments, in this embodiment, the projected area of the upper throttling orifice 11 in the axial direction is larger than that of the lower throttling orifice 11 in the axial direction; that is, the first throttling orifice 11 has the largest projected area in the axial direction, the second throttling orifice 11 has the second largest, and the third throttling orifice 11 has the smallest. This ensures that the corresponding throttling orifice 11 and throttling section 21 are compatible. The number and shape of the throttling orifice 11 and throttling section 21 can be set according to specific application scenarios, such as being related to fluid.
[0048] like Figure 1 and 2 As shown, as an optional implementation, the anti-fouling multi-stage single-seat valve core regulating valve structure also includes a hard alloy layer 3, which covers the inner wall of the throttling orifice 11.
[0049] Due to the long-term friction between the throttling section 21 and the throttling orifice 11, a hard alloy layer 3 is provided on the inner wall of the throttling orifice 11 to ensure the sealing of the fluid channel in the cut-off state.
[0050] like Figures 1-4As shown, in one optional embodiment, the valve body assembly 1 includes a valve body 12, which has a mounting cavity 13. The shell wall of the valve body 12 forms a fluid inlet A and a fluid outlet B that communicate with the mounting cavity 13. The valve body assembly 1 also includes a valve cover 14, a pressure cage 15, a sleeve 16, and a valve seat 17 connected in sequence. The valve seat 17, the sleeve 16, and at least part of the pressure cage 15 are all installed in the mounting cavity 13 and are all connected to the valve body 12. The valve cover 14 covers the outside of the valve body 12. The valve cover 14, the pressure cage 15, the sleeve 16, and the valve seat 17 all have hollow structures, and the hollow structures of the four are connected to form a valve core channel 18. The valve core channel 18 communicates with the mounting cavity 13 to form a fluid channel. The valve core 2 is assembled in the valve core channel 18 and moves along the valve core channel 18.
[0051] Based on the aforementioned embodiments, in this embodiment, the shell wall of the valve body 12 forms an installation cavity 13, which is part of the flow channel. The fluid inlet A is on the left, and the fluid outlet B is on the right. The valve cover 14, pressure cage 15, sleeve 16, and valve seat 17 are arranged sequentially from top to bottom. The valve cover 14, pressure cage 15, sleeve 16, and valve seat 17 are all columnar. The hollow structures of the valve cover 14, pressure cage 15, sleeve 16, and valve seat 17 are all vertically arranged, forming a valve core channel 18 extending in the vertical direction. Fluid flows into the installation cavity 13 from the fluid inlet A on the left, then flows upward through the valve core channel 18, then flows back into the installation cavity 13, and finally flows out from the fluid outlet B on the right.
[0052] like Figure 3 As shown, in one optional implementation, the mounting cavity 13 includes a first cavity 131 and a second cavity 132 that are connected to each other; the first cavity 131 is connected to the fluid inlet A; the second cavity 132 is connected to the fluid outlet B; the valve seat 17 is assembled in the first cavity 131, and a plurality of throttling holes 11 are formed in the hollow structure of the valve seat 17; the pressure cage 15 and the sleeve 16 are both assembled in the second cavity 132; the sleeve 16 is columnar, and the side wall of the sleeve 16 has a side hole that communicates with the inside and outside of the hollow structure of the sleeve 16.
[0053] Based on the aforementioned embodiments, in this embodiment, the first cavity 131 is lower than the second cavity 132. Side holes are evenly distributed on the sidewalls of multiple sleeves 16, connecting the hollow structure of the sleeves 16 and the second cavity 132. Fluid flows into the first cavity 131 from the fluid inlet A on the left, then flows upward through the hollow structure of the valve seat 17 and the hollow structure of the sleeves 16, then flows into the second cavity 132 through the side holes of the sleeves 16, and finally flows out from the fluid outlet B on the right.
[0054] like Figure 1 As shown, as an optional implementation, the anti-fouling multi-stage single-seat valve core regulating valve structure also includes a first seal 4, which seals the connection between the valve body 12 and the valve seat 17.
[0055] Based on the foregoing embodiment, in this embodiment, the first seal 4 is annular. One of the valve body 12 and the valve seat 17 has a convex part, and the other has a concave part, and the two are matched in concave-convex, and the first seal 4 is sealed at the concave-convex matched part of the two, so that the high-pressure fluid can be prevented from leaking.
[0056] As shown in Figure 1 , as an optional embodiment, the anti-fouling multi-stage single-seat valve core regulating valve structure further comprises a second seal 5, which is sealed at the connection between the valve body 12 and the pressure cage 15.
[0057] Based on the foregoing embodiment, in this embodiment, the second seal 5 is annular. One of the valve body 12 and the pressure cage 15 has a convex part, and the other has a concave part, and the two are matched in concave-convex, and the second seal 5 is sealed at the concave-convex matched part of the two, so that the high-pressure fluid can be prevented from leaking.
[0058] As shown in Figure 1 and 4 , as an optional embodiment, the valve core 2 comprises a threaded valve stem 23 and a throttling body 24, and a cylindrical pin 25 passing through both the valve stem 23 and the throttling body 24; the throttling body 24 comprises a plurality of throttling sections 21 connected in sequence; the valve stem 23 and the throttling body 24 are fixed against rotation by the cylindrical pin 25.
[0059] Based on the foregoing embodiment, in this embodiment, the throttling body 24 is cylindrical, and a threaded hole extending downward is formed at the top of the throttling body 24, and the threaded hole extends along the axis of the throttling body 24. Optionally, the valve stem 23 and the throttling body 24 are coaxially connected. The throttling body 24 is provided with a pin hole which communicates with the threaded hole. The valve stem 23 is provided with a pin fixing hole. The pin fixing hole can pass through the valve stem 23, and when the throttling body 24 is screwed to a specified position, the pin fixing hole corresponds to the pin hole, and the cylindrical pin 25 passes through the pin hole and the pin fixing hole.
[0060] As shown in Figure 4 , the pin fixing hole can also be formed in the side wall of the valve stem 23, forming a half-closed structure with a semicircular cross-section. When the throttling body 24 is screwed to a specified position, the pin fixing hole corresponds to the pin hole, and the cylindrical pin 25 passes through the pin hole and is located in the pin fixing hole; optionally, the cylindrical pin 25 abuts against the pin fixing hole.
[0061] When the throttling body 24 is rotated by the impact of high-pressure differential fluid, it will cause the valve stem 23 and the throttling body 24 to separate, so the cylindrical pin 25 is arranged at the threaded connection between the valve stem 23 and the throttling body 24 for fixation.
[0062] In the description of the present application, it needs to be understood that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0063] The terms "first", "second", are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.
[0064] In the description of the present application, it needs to be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0065] In the description of the present application, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable way.
[0066] The above is only part of the embodiments of the present application, and it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be regarded as the protection scope of the present application.
Claims
1. A dirt resistant multi-stage single seat trim regulating valve structure, characterized by, include: The valve body assembly (1) has a fluid passage including a plurality of interconnected throttling orifices (11); The valve core (2) is rod-shaped and includes a plurality of throttling sections (21) arranged axially, the plurality of throttling sections (21) corresponding sequentially to the plurality of throttling orifices (11); the valve core (2) is movable along its axis, the valve core (2) moves in a first direction to close the fluid passage; the valve core (2) moves in a second direction to open the fluid passage; the first direction and the second direction are opposite. Among them, the projected area of the plurality of throttling sections (21) in the axial direction decreases sequentially along the first direction, and at least one throttling inclined surface (22) is formed on the sidewall of the throttling section (21), and the throttling inclined surface (22) is inclined in the first direction and towards the axis of the valve core (2).
2. The anti-fouling multi-stage single-seat valve core regulating valve structure according to claim 1, characterized in that, The throttling ramps (22) of adjacent throttling sections (21) are offset in the axial direction.
3. The anti-fouling multi-stage single-seat valve core regulating valve structure according to claim 1, characterized in that, The distance from the end of the throttling slope (22) of the plurality of throttling sections (21) to the end of the corresponding throttling orifice (11) in the axial direction decreases sequentially along the first direction.
4. The anti-fouling multi-stage single-seat valve core regulating valve structure according to claim 1, characterized in that, The projected area of the plurality of throttling orifices (11) in the axial direction decreases sequentially along the first direction.
5. The anti-fouling multi-stage spool valve trim regulating valve structure according to claim 1, wherein, Also includes: A hard alloy layer (3) covers the inner wall of the throttling orifice (11).
6. The anti-fouling multi-stage single-seat valve core regulating valve structure according to claim 1, characterized in that, The valve body assembly (1) includes a valve body (12), the valve body (12) having a mounting cavity (13), and the shell wall of the valve body (12) forming a fluid inlet (A) and a fluid outlet (B) communicating with the mounting cavity (13); The valve body assembly (1) also includes a valve cover (14), a pressure cage (15), a sleeve (16), and a valve seat (17) connected in sequence; The valve seat (17), the sleeve (16) and at least part of the pressure cage (15) are all installed in the mounting cavity (13) and are all connected to the valve body (12), and the valve cover (14) is placed on the outside of the valve body (12); The valve cover (14), the pressure cage (15), the sleeve (16) and the valve seat (17) all have hollow structures and their hollow structures are connected to form a valve core channel (18). The valve core channel (18) is connected to the mounting cavity (13) to form the fluid channel. The valve core (2) is assembled in the valve core channel (18) and moves along the valve core channel (18).
7. The anti-fouling multi-stage single-seat valve core regulating valve structure according to claim 6, characterized in that, The mounting cavity (13) includes a first cavity (131) and a second cavity (132) that are connected to each other; The first cavity (131) is connected to the fluid inlet (A); The second cavity (132) is in communication with the fluid outlet (B), The valve seat (17) is assembled in the first cavity (131), and the plurality of throttling holes (11) are formed in the hollow structure of the valve seat (17); The pressing cage (15) and the sleeve (16) are both assembled in the second cavity (132), the sleeve (16) is in a columnar shape, and a side hole is formed in the side wall of the sleeve (16) and is in communication with the inside and outside of the hollow structure of the sleeve (16).
8. The anti-fouling multi-stage spool valve trim regulating valve structure according to claim 6, wherein, Further comprising: A first sealing member (4) is sealed at the connection between the valve body (12) and the valve seat (17).
9. The anti-fouling multi-stage spool valve trim regulating valve structure according to claim 6, wherein, Further comprising: A second sealing member (5) is sealed at the connection between the valve body (12) and the pressing cage (15).
10. The anti-fouling multi-stage single-seat valve core regulating valve structure according to any one of claims 1-9, wherein The valve core (2) comprises a threaded valve stem (23) and a throttling body (24), and a cylindrical pin (25) penetrating both the valve stem (23) and the throttling body (24); The throttling body (24) comprises the plurality of throttling sections (21) connected in sequence; The valve stem (23) and the throttling body (24) are fixedly prevented from rotating by the cylindrical pin (25).