High-precision throttle valve

Abstract

The application belongs to the technical field of valves, and discloses a high-precision throttling valve, which comprises a valve body, a valve core and a valve seat arranged in the valve body, the cooperation part of the valve core and the valve seat comprises a sealing part and a throttling part arranged in sequence along an axial direction, the sealing part is in a conical shape, the valve seat is provided with a sealing cavity corresponding to the sealing part, and the sealing cavity is provided with a conical inner wall for sealing cooperation with the sealing part; the valve seat is further provided with a throttling cavity in communication with the sealing cavity, and the throttling part can be inserted into the throttling cavity, wherein the throttling part comprises at least two conical throttling sections connected in sequence along a first direction, the taper angles of the conical throttling sections are all 0°-9°, the taper angles of the conical throttling sections increase gradually along the first direction, and the adjacent conical throttling sections are smoothly connected. The separate arrangement of the sealing surface and the throttling surface can effectively reduce the scouring of the sealing surface by high-speed sand-containing fluid, the multi-section small taper angles and the gradual increase of the taper angles can reduce the change gradient of the flow area, so that the flow regulation precision in the small flow control scene is improved.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a high-precision throttling valve. Background Technology

[0002] Throttling valves are widely used in various fields such as oil and gas extraction, oil and gas well control, oil and gas production, throttling manifolds, and high-pressure testing processes. As oil and gas exploration and development extend to deep wells, ultra-deep wells, and high-pressure, high-production areas, the operating conditions are becoming increasingly demanding. Especially in the early stages of oil and gas well production, the wellbore fluid often carries a large amount of formation sand, cementing particles, and drilling fluid impurities, resulting in fluids exhibiting significant characteristics such as high pressure differential, high flow velocity, high sand content, and strong scouring. This places extremely high demands on the scouring resistance and adjustment accuracy of throttling valves, and their performance directly affects the safety and economy of oil and gas extraction.

[0003] Existing traditional plunger-type throttle valves have the following obvious technical defects under the above-mentioned complex working conditions: On the one hand, the high-speed flowing sand-containing fluid directly impacts the valve sealing surface, which can easily cause scratches and wear on the sealing surface, leading to premature failure of the sealing surface and causing excessive internal leakage. This not only affects the throttling control effect but may also cause safety hazards, increase equipment maintenance costs and downtime losses. On the other hand, traditional plunger-type throttle valves have low adjustment accuracy and poor stability in low-flow control scenarios. They cannot achieve precise control of fluid flow and are difficult to adapt to working conditions with strict requirements for adjustment accuracy, such as high-pressure testing and fine oil extraction.

[0004] Therefore, there is an urgent need to develop a high-precision throttling valve to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to solve or at least alleviate some or all of the aforementioned problems. Therefore, the purpose of this invention is to provide a high-precision throttle valve to improve sealing reliability and flow regulation accuracy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A high-precision throttle valve includes a valve body, a valve core, and a valve seat disposed within the valve body, wherein the valve core and the valve seat are slidably engaged.

[0008] The valve core and the valve seat mating part includes a sealing part and a throttling part arranged sequentially along the axial direction. The sealing part is conical. The valve seat has a sealing cavity corresponding to the sealing part. The sealing cavity has a conical inner wall for sealing mating with the sealing part.

[0009] The valve seat also has a throttling cavity that communicates with the sealing cavity. The throttling part can be inserted into the throttling cavity. The throttling part includes at least two conical throttling sections connected sequentially along a first direction. The cone angle of each conical throttling section is 0° to 9°, and the cone angle of each conical throttling section increases segment by segment along the first direction. The adjacent conical throttling sections are smoothly connected.

[0010] In some optional embodiments, the cone angle of the sealing portion is 55° to 65°.

[0011] In some alternative embodiments, the throttling section includes three sections of the conical throttling segment.

[0012] In some optional embodiments, the three conical throttling sections are designated as a first throttling section, a second throttling section, and a third throttling section, wherein the cone angle of the first throttling section is α, 0° < α < 2°, and / or,

[0013] The cone angle of the second throttling section is β, 2°≤β≤4°, and / or,

[0014] The cone angle of the third throttling section is γ, where 5°≤γ≤9°.

[0015] In some alternative embodiments, the throttling cavity is a cylindrical cavity.

[0016] In some optional embodiments, a first stepped cross-section is provided between the sealing portion and the throttling portion, and a second stepped cross-section is provided between the sealing cavity and the throttling cavity. When the sealing portion and the conical inner wall of the sealing cavity are in sealing engagement, the first stepped cross-section and the second stepped cross-section are axially spaced opposite each other to form a buffer region; and / or,

[0017] The sealing part and the throttling part are provided with hard alloy reinforced structures.

[0018] In some optional embodiments, the high-precision throttle valve further includes a cage sleeve, which is coaxially press-fitted onto the upper end of the valve seat, and the valve core further includes a mating part that slides with the cage sleeve, the mating part being coaxially connected to the upper end of the sealing part.

[0019] In some optional embodiments, the lower end of the cage sidewall is provided with a plurality of throttling holes.

[0020] In some optional embodiments, the cage sidewall is provided with at least two throttling structures, each of the throttling structures being arranged at intervals along the axial direction of the cage, and each of the throttling structures including a plurality of throttling holes evenly spaced along the circumference of the cage.

[0021] In some alternative embodiments, the projections of the throttling orifices of each of the throttling structures onto the radial section of the cage are staggered.

[0022] The beneficial effects of this invention are:

[0023] This invention provides a high-precision throttling valve, comprising a valve body, a valve core, and a valve seat disposed within the valve body. The valve core and valve seat are slidably fitted together. The valve core and valve seat mating area includes a sealing portion and a throttling portion arranged sequentially along the axial direction. The sealing portion is conical. The valve seat has a sealing cavity corresponding to the sealing portion, and the sealing cavity has a conical inner wall for sealing with the sealing portion. The valve seat also has a throttling cavity communicating with the sealing cavity. The throttling portion can be inserted into the throttling cavity. The throttling portion includes at least two conical throttling segments connected sequentially along a first direction. The cone angle of each conical throttling segment is 0°~9°, and the cone angle of each conical throttling segment gradually increases along the first direction. Adjacent conical throttling segments are smoothly transitioned and connected. The first direction is the direction along the valve core axis toward the throttling cavity.

[0024] The sealing and throttling parts of the aforementioned high-precision throttling valve are arranged sequentially along the axial direction, achieving a separate arrangement of the sealing surface and the throttling surface. Based on the fluid scouring characteristics, it can be seen that the area with the greatest scouring force under throttling conditions is concentrated between the throttling part and the inner wall of the throttling chamber. Compared with the traditional throttling valve structure where the sealing and throttling surfaces are integrated, this separate structure allows the sealing surface to avoid the area with the greatest scouring force, effectively reducing the direct scouring of the sealing surface by high-speed sand-containing fluid. This reduces the probability of scratches, wear, and premature failure of the sealing surface, avoids excessive internal leakage, and reduces equipment maintenance costs and downtime losses.

[0025] The multi-segment design with gradually increasing cone angles offers the following advantages: First, the structural characteristics of the small cone angle result in a slower rate of change of flow area with displacement. Compared to a large cone angle design, the change in flow area per unit axial displacement is smaller, thus reducing the gradient of flow area change, making the CV curve smoother, avoiding flow fluctuations caused by abrupt changes in flow area, significantly improving valve regulation resolution, and achieving precise control of minute flow rates. Second, the arrangement of multi-segment cone angles with gradually increasing angles ensures that the cone angle of the upper throttling segment is smaller, further improving control accuracy under minute flow rates. Specifically, in minute flow rate control scenarios, the accuracy requirements for flow area changes are extremely high, requiring minute and precise adjustments to the flow area. The upper throttling segment serves as the initial flow path or micro-flow path for the fluid. The throttling structure, which functions primarily at small openings, features a smaller cone angle that allows for more subtle changes in the flow area with axial displacement of the throttling section. This further reduces the increase in flow area per unit displacement, enabling precise adjustment of the flow area. This effectively addresses the shortcomings of traditional throttling valves, such as instability and insufficient precision in controlling small flow rates. It is suitable for demanding conditions requiring precise control of small flow rates, such as high-pressure testing and fine oil extraction, further enhancing the overall regulating performance of the valve. In addition, the smooth connection of the small cone angles in each section makes the overall CV curve of the throttling section smoother, further improving the flow regulation accuracy and stability in small flow control scenarios. At the same time, the smooth CV curve also reduces the local resistance and scouring intensity when the fluid flows through the throttling section, further improving the anti-scouring performance of the throttling section, extending the overall service life of the valve, and ensuring long-term stable operation of the valve. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional view of the high-precision throttle valve described in an embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional view of the valve core, valve seat, and cage sleeve as described in the embodiments of the present invention;

[0029] Figure 3 This is a schematic diagram of the sealing part and the throttling part according to an embodiment of the present invention;

[0030] Figure 4 This is a cross-sectional view of the cage sleeve described in an embodiment of the present invention;

[0031] Figure 5 yes Figure 4 Sectional view at point AA;

[0032] Figure 6 yes Figure 4 Sectional view at point BB.

[0033] In the picture:

[0034] 1. Valve body; 2. Valve core; 21. Sealing part; 22. Throttling part; 221. First throttling section; 222. Second throttling section; 223. Third throttling section; 23. First stepped section; 24. Fitting part; 3. Valve seat; 31. Sealing cavity; 32. Throttling cavity; 33. Second stepped section; 4. Buffer area; 5. Cage sleeve; 51. Throttling orifice. Detailed Implementation

[0035] Embodiments of the present invention 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 components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] In this invention, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a 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. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0037] In this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "and / or" relationship.

[0038] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," "combined," "coupled," and "installed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection via an intermediate medium; or the internal communication of two components or the interaction between two components. As examples, a direct connection refers to two parts or components being connected together without the need for an intermediate medium, while an indirect connection refers to two parts or components each being connected to at least one intermediate medium, with the connection achieved through the intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, "connected" and "coupled" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0039] In this invention, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0040] In this invention, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0041] In this invention, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientations or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, 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 invention. Furthermore, in the context, it should be understood that when an element is mentioned as being "upper" or "lower" than another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as "upper side," "lower side," "left side," "right side," "front side," and "rear side" not only represent positive orientation but can also be understood as lateral orientation. For example, "above," "on top of," "upper side of," and "above" the first feature "above" or "on the second feature" includes the first feature being directly above, to the upper left, to the upper right, to the upper front, and to the upper rear of the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature. The terms "below," "under," "below," and "below" for "first feature" and "second feature" include situations where the first feature is directly below, to the lower left, to the lower right, in front of, or behind the second feature, or simply indicate that the first feature is at a lower horizontal level than the second feature. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0042] like Figure 1 and Figure 2 As shown, this embodiment provides a high-precision throttle valve, including a valve body 1, a valve core 2, and a valve seat 3 disposed within the valve body 1. The valve core 2 and the valve seat 3 are slidably fitted together. The fit between the valve core 2 and the valve seat 3 includes a sealing part 21 and a throttling part 22 arranged sequentially along the axial direction. The sealing part 21 is conical. The valve seat 3 has a sealing cavity 31 corresponding to the sealing part 21. The sealing cavity 31 has a conical inner wall for sealing fit with the sealing part 21. The valve seat 3 also has a throttling cavity 32 connected to the sealing cavity 31. The throttling part 22 can be inserted into the throttling cavity 32. The throttling part 22 includes at least two conical throttling sections connected sequentially along a first direction. The cone angle of each conical throttling section is 0°~9°, and the cone angle of each conical throttling section gradually increases along the first direction. Adjacent conical throttling sections are smoothly transitioned and connected. The first direction is the direction along the axis of the valve core 2 toward the throttling cavity 32.

[0043] The sealing part 21 and the throttling part 22 of the high-precision throttling valve are arranged sequentially along the axial direction to achieve a separate arrangement of the sealing surface and the throttling surface. According to the fluid scouring characteristics, the area with the greatest scouring force under throttling conditions is concentrated between the throttling part 22 and the inner wall of the throttling cavity 32. Compared with the traditional throttling valve structure where the sealing surface and the throttling surface are integrated, this separate structure allows the sealing surface to avoid the area with the greatest scouring force, effectively reducing the direct scouring of the sealing surface by high-speed sand-containing fluid, thereby reducing the probability of scratches, wear and premature failure of the sealing surface, avoiding excessive internal leakage, and reducing equipment maintenance costs and downtime losses.

[0044] It is easy to understand that the cone angle of the throttling section 22 of the traditional valve core 2 is consistent. The flow area changes linearly or with a fixed slope as the axial displacement of the throttling section 22 changes. If the cone angle is too large, the change in flow area under the same axial displacement will be too large, and the change gradient will be steep. If the cone angle is too small, although the change gradient can be reduced, the single small cone angle design is difficult to meet the control requirements of different flow ranges, and it is easy to cause the overall length of the throttling section 22 to be too long, affecting the rationality of the valve structure.

[0045] Therefore, this embodiment adopts a multi-segment small cone angle design with progressively increasing cone angles, which has the following effects: First, the structural characteristics of the small cone angle itself determine that its flow area changes slowly with displacement. Compared with the large cone angle design, the change in flow area per unit axial displacement is smaller, thereby reducing the gradient of flow area change and making the CV curve (flow area as a function of valve opening) smoother. This avoids flow fluctuations caused by sudden changes in flow area, significantly improving the valve's adjustment resolution and achieving precise control of small flow rates. Second, the arrangement of multi-segment cone angles with progressively increasing cone angles results in a smaller cone angle in the upper throttling segment, which further improves the control accuracy under small flow rates. Specifically, in small flow rate control scenarios, the accuracy requirements for the change in flow area are extremely high, requiring small and precise adjustments to the flow area. The upper throttling segment, as... The throttling structure, which primarily functions during initial fluid flow or at small openings, features a small cone angle that allows for more subtle changes in the flow area with the axial displacement of the throttling section 22. This further reduces the increase in flow area per unit displacement, enabling precise adjustment of the flow area. This effectively addresses the shortcomings of traditional throttling valves, such as unstable and insufficient precision in small flow control. It is suitable for demanding conditions requiring precise control of small flow rates, such as high-pressure testing and fine oil extraction, further enhancing the overall regulating performance of the valve. In addition, the smooth connection of the small cone angles in each section makes the overall CV curve of the throttling section 22 smoother, further improving the flow regulation accuracy and stability in small flow control scenarios. At the same time, the smooth CV curve also reduces the local resistance and scouring intensity when the fluid flows through the throttling section 22, further improving the scouring resistance of the throttling section 22, extending the overall service life of the valve, and ensuring long-term stable operation of the valve.

[0046] It should be noted that the cone angle refers to the angle between the two generatrices of a cone structure on the axial section; the cylindrical structure is the ultimate form where the cone angle is 0°.

[0047] In some optional embodiments, the cone angle of the sealing part 21 is 55° to 65°. This angle range ensures that a sufficiently large and stable initial contact stress is formed between the sealing part 21 and the conical inner wall of the sealing cavity 31 to achieve reliable sealing. At the same time, it effectively avoids problems such as excessively long sealing surface travel, increased axial dimension of valve core 2, and slow opening and closing action caused by too small a cone angle. It also prevents the sealing surface from being too narrow and the specific pressure from being too high due to too large a cone angle, which would lead to wear or plastic deformation of the sealing pair. Thus, this cone angle range achieves the optimal balance between sealing reliability, action sensitivity, and sealing pair service life, and is especially suitable for high-pressure throttling conditions that require frequent opening and closing or long-term shut-off.

[0048] In this embodiment, the cone angle of the sealing portion 21 is 60°. Optionally, in other embodiments, the cone angle of the sealing portion 21 may include, but is not limited to, 55°, 57°, 62° or 65°, and is not limited here.

[0049] In some optional embodiments, the throttling section 22 includes three conical throttling sections, which can improve the precision of pressure drop distribution throughout the entire stroke of the valve core 2 from closed to fully open, making the flow-opening characteristic curve exhibit a smooth gradual trend. This avoids the step effect in the opening region of the two conical sections and also avoids excessive processing complexity, achieving high linearity and continuous precision adjustment at a lower cost. In other embodiments, the throttling section 22 may also include two or five conical throttling sections, which is not limited here.

[0050] like Figure 3 As shown, in some optional embodiments, the three conical throttling sections are the first throttling section 221, the second throttling section 222, and the third throttling section 223. The cone angle of the first throttling section 221 is α, where 0° < α < 2°. As the main throttling structure for the initial flow of fluid or when the valve is slightly open, its extremely small cone angle allows the flow area to change more subtly with the slight displacement of the throttling section 22. The increase in flow area corresponding to each unit axial displacement is minimized. Operators can achieve fine adjustment of the flow area by precisely controlling the slight displacement of the throttling section 22, thereby achieving precise control of the small flow rate. This solves the problems of flow fluctuation and insufficient accuracy that are prone to occur when controlling the small flow rate of traditional throttling valves. It is suitable for working conditions with extremely high requirements for the precision of small flow rate control, such as high pressure testing and fine oil extraction.

[0051] Optionally, the cone angle α of the first throttling section 221 can be 0.2°, 0.6°, 1°, 1.5° or 1.9°, and is not limited here.

[0052] The cone angle of the second throttling section 222 is β, 2°≤β≤4°. As a transition structure between the first throttling section 221 and the third throttling section 223, its cone angle is between the two, which can achieve a smooth connection of the flow area change, avoid the sudden change of flow area caused by the sudden change of cone angle of adjacent throttling sections, and thus avoid the generation of local eddies and pressure changes when the fluid flows through, reduce the scouring intensity of the fluid on the throttling section 22, and at the same time keep the CV curve continuous and smooth, further improving the stability and accuracy of the overall valve regulation, ensuring the regulation effect in the medium flow range, and taking into account both regulation accuracy and flow efficiency.

[0053] Optionally, the cone angle β of the second throttling section 222 can be 2°, 2.6°, 3°, 3.5° or 4°, and is not limited here.

[0054] The cone angle of the third throttling section 223 is γ, 5°≤γ≤9°, which is suitable for slightly larger flow control scenarios. When the valve opening increases and a large flow is required, the larger cone angle can moderately increase the flow area with the increase of the axial displacement of the throttling section 22. Under the premise of avoiding sudden changes in the flow area, the flow requirements are met without excessively increasing the overall length of the throttling section 22. This balances the efficiency of large flow and the compactness of the valve structure, and solves the defect that a single small cone angle design requires increasing the length of the throttling section 22 to meet the large flow requirements, resulting in an unreasonable valve structure.

[0055] Optionally, the cone angle γ of the third throttling section 223 can be 5°, 6°, 7°, 8° or 9°, and is not limited here.

[0056] In some optional embodiments, the throttling cavity 32 is a cylindrical cavity, and a uniform annular flow channel can be formed between the inner wall of the cylindrical cavity and the throttling section 22. This ensures that the flow field distribution is uniform when the fluid flows through the throttling section 22, avoiding problems such as excessively high local flow velocity and eddy current generation caused by irregular flow channel shape. This further reduces the scouring intensity of the fluid on the throttling section 22 and protects the surface of the throttling section from wear. At the same time, during the axial movement of the throttling section 22, the gap between it and the inner wall of the cylindrical throttling cavity 32 is uniform and consistent, ensuring the accuracy of the flow area change. This further improves the adjustment accuracy and operational stability of the valve, and works synergistically with the gradient design of the three-section conical throttling section to jointly ensure the reliable operation of the valve under complex working conditions.

[0057] In some optional embodiments, a first stepped section 23 is provided between the sealing part 21 and the throttling part 22, and a second stepped section 33 is provided between the sealing cavity 31 and the throttling cavity 32. When the sealing part 21 and the conical inner wall of the sealing cavity 31 are in sealing engagement, the first stepped section 23 and the second stepped section 33 are axially spaced apart to form a buffer region 4. This buffer region 4 is located between the sealing surface and the throttling surface, and works synergistically with the separate design of the sealing surface and the throttling surface to further enhance the anti-erosion effect of the sealing surface and extend the service life of the sealing pair.

[0058] In some optional embodiments, the sealing part 21 and the throttling part 22 are provided with hard alloy reinforced structures. These hard alloy reinforced structures can be any one of a solid hard alloy segment, a hard alloy insert, or a hard alloy protective coating. Alternatively, they can be obtained by welding onto a low-hardness alloy base material, thereby ensuring the wear resistance, erosion resistance, and structural strength of the critical sealing and throttling surfaces, guaranteeing the service life and safety of the throttling valve. The remaining parts of the valve core 2 can be made of a low-hardness alloy base material, significantly reducing costs while ensuring wear resistance and erosion resistance.

[0059] like Figure 2 As shown, in some optional embodiments, the high-precision throttle valve further includes a cage sleeve 5, which is coaxially press-fitted onto the upper end of the valve seat 3. The valve core 2 also includes a mating part 24 that slides with the cage sleeve 5, and the mating part 24 is coaxially connected to the upper end of the sealing part 21. The installation method of coaxially press-fitting the cage sleeve 5 onto the upper end of the valve seat 3 provides a firm connection and high coaxiality, effectively ensuring the concentricity between the cage sleeve 5, the valve seat 3, and the valve core 2. This avoids component wear or jamming caused by assembly deviations. Furthermore, the press-fit structure eliminates the need for additional complex connecting parts, simplifying the overall valve assembly process and facilitating subsequent disassembly and maintenance. The mating part 24 of the valve core 2 slides with the cage sleeve 5, and the mating part 24 is coaxially connected to the upper end of the sealing part 21. This provides precise guidance for the axial movement of the valve core 2, ensuring that the valve core 2 always moves along the axial direction during reciprocating movement. This prevents the valve core 2 from shifting or tilting, thereby ensuring the sealing fit accuracy between the sealing part 21 and the sealing cavity 31, and preventing sealing failure and internal leakage caused by valve core 2 shifting.

[0060] like Figure 2 , Figures 4-6As shown, the lower end of the side wall of the cage sleeve 5 is provided with multiple throttling holes 51, which can divert high-speed fluid. It can evenly disperse the overall high-speed fluid into multiple fine streams, effectively weaken the local impact kinetic energy of the fluid, significantly reduce the local flow velocity at the fluid flow location, greatly reduce the erosion and wear caused by direct fluid scouring, avoid the problems of local scouring damage and fluctuation of throttling effect that are prone to occur in a single flow channel, and regulate the fluid flow state, reduce fluid turbulence and pressure change, effectively improve the stability and continuity of the overall throttling operation, further enhance the scouring resistance and service life of the sealing surface, and adapt to the long-term stable use requirements under high flow velocity and strong scouring conditions.

[0061] Furthermore, the sidewall of the cage sleeve 5 is provided with at least two throttling structures, each throttling structure being arranged at intervals along the axial direction of the cage sleeve 5, and each throttling structure including multiple throttling holes 51 evenly spaced along the circumference of the cage sleeve 5. The multiple rings of densely packed small holes further disperse the fluid, reducing the local flow velocity and erosion intensity.

[0062] Furthermore, the projections of the throttling orifices 51 of each throttling structure onto the radial section of the cage 5 are staggered. The staggered arrangement of the throttling orifices 51 of each throttling structure on the radial section prevents the fluid from concentrating and rushing along a single vertical path, further dispersing and weakening the fluid's impact kinetic energy. This allows the fluid pressure and scouring force to be evenly distributed across the entire sidewall of the cage 5, avoiding long-term high-intensity erosion loss in localized areas, effectively optimizing the overall stress and scouring environment, continuously improving the throttling valve's scouring and wear resistance, and extending its service life and stability under harsh media conditions.

[0063] In this embodiment, the diameters of the mating part 24, the sealing part 21, and the throttling part 22 decrease sequentially, ensuring that each bend in the outer wall of the valve core 2 is not less than 90°. This creates a streamlined, dead-angle-free flow channel between the valve core 2, the cage sleeve 5, and the valve seat 3. The absence of stagnant areas and dead zones within the flow channel effectively prevents the accumulation of medium sand particles, avoids eddy current impacts and localized high-speed erosion, improves fluid flow smoothness, reduces the wear rate of internal components, and effectively extends the overall service life of the valve.

[0064] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A high-precision throttle valve, comprising a valve body (1), a valve core (2), and a valve seat (3) disposed within the valve body (1), wherein the valve core (2) and the valve seat (3) are in sliding engagement, characterized in that, The valve core (2) and the valve seat (3) are connected by a sealing part (21) and a throttling part (22) arranged sequentially along the axial direction. The sealing part (21) is conical. The valve seat (3) has a sealing cavity (31) corresponding to the sealing part (21). The sealing cavity (31) has a conical inner wall for sealing and engaging with the sealing part (21). The valve seat (3) also has a throttling cavity (32) that communicates with the sealing cavity (31). The throttling part (22) can be inserted into the throttling cavity (32). The throttling part (22) includes at least two conical throttling sections connected sequentially along a first direction. The cone angle of each conical throttling section is 0°~9°, and the cone angle of each conical throttling section increases segment by segment along the first direction. The adjacent conical throttling sections are smoothly connected.

2. The high-precision throttle valve according to claim 1, characterized in that, The cone angle of the sealing part (21) is 55°~65°.

3. The high-precision throttle valve according to claim 1, characterized in that, The throttling section (22) includes three conical throttling sections.

4. The high-precision throttle valve according to claim 3, characterized in that, The three conical throttling sections are the first throttling section (221), the second throttling section (222), and the third throttling section (223), respectively. The cone angle of the first throttling section (221) is α, where 0° < α < 2°, and / or, The cone angle of the second throttling section (222) is β, 2°≤β≤4°, and / or, The cone angle of the third throttling section (223) is γ, 5°≤γ≤9°.

5. The high-precision throttle valve according to claim 1, characterized in that, The throttling cavity (32) is a cylindrical cavity.

6. The high-precision throttle valve according to claim 1, characterized in that, The sealing part (21) and the throttling part (22) have a first stepped cross-section (23), and the sealing cavity (31) and the throttling cavity (32) have a second stepped cross-section (33). When the sealing part (21) and the conical inner wall of the sealing cavity (31) are sealed together, the first stepped cross-section (23) and the second stepped cross-section (33) are axially spaced apart to form a buffer area (4); and / or, The sealing part (21) and the throttling part (22) are provided with hard alloy reinforced structures.

7. The high-precision throttle valve according to claim 1, characterized in that, The high-precision throttle valve also includes a cage sleeve (5), which is coaxially press-fitted onto the upper end of the valve seat (3). The valve core (2) also includes a mating part (24) that slides with the cage sleeve (5), and the mating part (24) is coaxially connected to the upper end of the sealing part (21).

8. The high-precision throttle valve according to claim 7, characterized in that, The cage (5) has multiple throttling holes (51) at the lower end of its side wall.

9. The high-precision throttle valve according to claim 8, characterized in that, The cage sleeve (5) has at least two throttling structures on its side wall. Each throttling structure is arranged at intervals along the axial direction of the cage sleeve (5), and each throttling structure includes a plurality of throttling holes (51) evenly spaced along the circumference of the cage sleeve (5).

10. The high-precision throttle valve according to claim 9, characterized in that, The projections of the throttling orifices (51) of each of the throttling structures on the radial section of the cage (5) are staggered.

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