Sleeve adjusting valve with segmented adjusting function

Abstract

The utility model discloses a sleeve adjusting valve with a sectional adjusting function, aims to solve the problems that fine adjustment and large-flow passing cannot be considered at the same time and flow jumps in the prior art, and relates to the technical field of adjusting valves. A plurality of small holes are formed in the low section area, a plurality of middle holes similar to inverted triangles are uniformly distributed in the circumferential direction of the middle section area, and a plurality of large holes are uniformly distributed in the circumferential direction of the high section area; the area of a hole area, allowing a medium to pass through, of the low section area accounts for 10%-15% of the total hole area of the sleeve, the area of a hole area, allowing a medium to pass through, of the middle section area accounts for 20%-30% of the total hole area of the sleeve, and the area of a hole area, allowing a medium to pass through, of the high section area accounts for 55%-65% of the total hole area of the sleeve. The adjusting effect that the medium passing area is smoothly and progressively increased along with the increase of the opening degree in the opening process of the valve element is achieved; the inverted triangular hole in the middle section serves as a transition area, so that the flow change slope in the middle opening stage tends to be gentle, the linearity of a control curve is improved, and the applicable working condition of the valve is widened.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, and particularly relates to a sleeve control valve with a segmented adjustment function. Background Art

[0002] Sleeve control valves are widely used in the field of industrial fluid control, and the design of their throttling structure directly affects the adjustment performance. The throttling hole structures of existing sleeve control valves mostly adopt a single type or a fixed combination form, making it difficult to balance the performance requirements of different adjustment stages in the same valve. For example, when a traditional sleeve is adjusted at a small opening, due to the lack of a throttling structure specifically adapted for fine adjustment, the change in the throttling area of a single aperture is not smooth enough, easily resulting in large fluctuations in fluid flow rate, and it is difficult to achieve stable control of trace fluids. Especially in scenarios such as chemical industry and pharmaceuticals that require precise metering or precise proportioning, the problem of insufficient small-flow adjustment accuracy is more prominent. In the large-opening stage, the sudden increase in the flow area is likely to cause a flow jump, and the control curve shows obvious non-linear characteristics. Existing sleeve control valves mostly adopt equal-diameter holes or a fixed number of aperture combinations, and cannot balance the dual requirements of fine adjustment and large-flow passage in the same valve. Moreover, although there are attempts in the prior art to improve the flow characteristics by combining different hole types, their structures are mostly limited, and the change in hole types lacks transitional connection, resulting in uneven throttling transition when the valve core moves, and the medium flow area still shows a step-like mutation, causing a flow jump phenomenon during the adjustment process and affecting the system stability. Summary of the Utility Model

[0003] The purpose of the utility model: Aiming at the problems of inability to balance fine adjustment and large-flow passage and flow jump existing in the above-mentioned prior art, the utility model provides a sleeve control valve with a segmented adjustment function.

[0004] The technical solution of the utility model: It includes a sleeve and a valve core. The valve core is movably arranged inside the sleeve. The sleeve at least includes a low-section area, a middle-section area, and a high-section area in sequence from bottom to top along its axial direction. The areas available for the medium to pass through in the low-section area, the middle-section area, and the high-section area gradually increase in sequence as the opening of the valve core increases; a plurality of small holes are arranged in the low-section area, a plurality of middle holes similar to inverted triangles are evenly distributed circumferentially in the middle-section area, and a plurality of large holes are evenly distributed circumferentially in the high-section area; the area of the hole area available for the medium to pass through in the low-section area accounts for between 10% and 15% of the total hole area of the sleeve, the area of the hole area available for the medium to pass through in the middle-section area accounts for between 20% and 30% of the total hole area of the sleeve, and the area of the hole area available for the medium to pass through in the high-section area accounts for between 55% and 65% of the total hole area of the sleeve.

[0005] Adopting the above technical solution, by axially dividing the sleeve into a low-section area, a middle-section area, and a high-section area, and setting the proportion of the hole area in different areas, the adjustment effect that the medium passage area increases smoothly with the increase of the opening degree during the opening process of the valve core is achieved; the small holes in the low-section area open first, which is suitable for fine adjustment of small flow rates and meets the requirements of scenarios such as precision metering; the medium holes in the middle-section area gradually participate in throttling, and the inverted triangular medium holes ensure a linear flow rate change at medium opening degrees; the large holes in the high-section area provide a large flow rate passage capacity at large opening degrees; this structure avoids the problems of large fluctuations at small opening degrees and large flow rate jumps at large opening degrees caused by a single hole type in traditional sleeves, and through the inverted triangular holes in the middle section as a transition area, its gradually expanding hole type and the proportion of the area make the slope of the flow rate change tend to be gentle in the medium opening degree stage, improving the linearity of the control curve, effectively improving the adjustment accuracy and stability within the full stroke range of the control valve, and broadening the applicable working conditions of the valve.

[0006] In a possible design, the bottom endpoint of the medium hole is close to the low-section area, its top side is close to the high-section area, its two side edges are in the shape of concave arcs, and its three endpoints are respectively rounded.

[0007] Adopting the above design, when the valve core gradually opens from a medium opening degree, this shape can make the fluid passage area increase linearly with the valve core displacement, achieving a linear adjustment effect, and the concave arc and rounded transition designs reduce the resistance and turbulence of the fluid flow, reduce energy loss, and at the same time avoid flow rate jumps caused by sudden changes in the hole type, ensuring the smoothness and predictability of flow rate adjustment at medium opening degrees, and is suitable for process control scenarios with high requirements for flow rate linearity.

[0008] In a possible design, multiple small holes are evenly arranged in a circumferential array along the sleeve, and the shape of a single small hole is a circular hole with a diameter not exceeding 3 mm.

[0009] Adopting the above design, the evenly distributed small holes can allow the fluid to pass through with a small and stable flow rate at small opening degrees, avoiding adjustment inaccuracy caused by local flow concentration; the small hole diameter of less than 3 mm limits the initial fluid passage volume, helps to achieve precise control of trace fluids, strengthens the fine adjustment ability of the low-section area, and is especially suitable for scenarios such as chemical proportioning and laboratory fluid control with extremely high requirements for flow rate accuracy.

[0010] In a possible design, the large hole is rectangular, and each endpoint of the rectangle is rounded.

[0011] Adopting the above design, making full use of the characteristic of the relatively large cross-sectional area of the rectangular hole, it provides a wide and smooth flow passage for the fluid at large opening degrees, significantly improving the large flow rate passage capacity of the valve, and the rounded transition can reduce the impact and eddy current of the fluid at the hole edge, reducing the risk of cavitation and fluid noise.

[0012] In a possible design, the sealing surface of the valve core is a conical frustum structure that matches the inner wall of the sleeve.

[0013] With the above design, compared with traditional planar sealing, this structure can form a tighter contact seal when the valve core is closed, effectively reducing the medium leakage and improving the sealing performance and reliability of the valve.

[0014] In a possible design, the valve core and the inner wall of the sleeve are respectively provided with steps, and the steps of the two abut against each other when the valve core and the sleeve are closed.

[0015] With the above design, when the valve core is closed, the stepped structure can provide a clear limiting function to prevent damage to the sealing surface caused by excessive displacement of the valve core. Description of the Drawings

[0016] Figure 1 It is a cross-sectional view of the present utility model in the closed state;

[0017] Figure 2 It is a cross-sectional view of the present utility model in the open state;

[0018] Figure 3 It is a schematic structural diagram of the sleeve of the present utility model;

[0019] Figure 4 It is a schematic structural diagram of the sleeve of the present utility model;

[0020] Wherein, 1. Sleeve; 11. Low section area; 111. Small hole; 12. Middle section area; 121. Middle hole; 13. High section area; 131. Large hole; 2. Valve core; 21. Conical frustum structure; 22. Step. Detailed Embodiment

[0021] Such as Figures 1-4A sleeve control valve with a segmented adjustment function as shown includes a sleeve 1 and a valve core 2. The valve core 2 is movably arranged inside the sleeve 1. The sleeve 1 at least includes a low-section area 11, a middle-section area 12, and a high-section area 13 in sequence from bottom to top along its axial direction. The areas available for the medium to pass through in the low-section area 11, the middle-section area 12, and the high-section area 13 gradually increase in sequence as the opening degree of the valve core 2 increases. Multiple small holes 111 are arranged in the low-section area 11. In the middle-section area 12, multiple middle holes 121 similar to inverted triangles are evenly distributed circumferentially. In the high-section area 13, multiple large holes 131 are evenly distributed circumferentially. The area of the hole area available for the medium to pass through in the low-section area 11 accounts for 10% to 15% of the total hole area of the sleeve 1. The area of the hole area available for the medium to pass through in the middle-section area 12 accounts for 20% to 30% of the total hole area of the sleeve 1. The area of the hole area available for the medium to pass through in the high-section area 13 accounts for 55% to 65% of the total hole area of the sleeve 1. During actual manufacturing, an integral molding process can be adopted, and the sleeve 1 is made of corrosion-resistant and high-strength stainless steel material. To ensure that the area ratio of each section meets the design requirements, the number, size, and distribution of the holes are controlled through precision numerical control machining technology.

[0022] The middle hole 121 is in a shape similar to an inverted triangle. Its bottom endpoint is close to the low-section area 11, its top side is close to the high-section area 13, its two side edges are in a concave arc shape, and its three endpoints are respectively transitioned by rounded corners. During the manufacturing process, the middle hole 121 is formed by wire cutting or electric discharge machining process. After machining, the endpoints of the hole are polished so that the radius of the rounded corner is controlled within 3 mm. This structure of the middle hole 121 enables the fluid passing area to increase linearly with the displacement of the valve core 2 when the valve core 2 is gradually opened from a medium opening degree, effectively ensuring the smoothness and linearity of the flow regulation at the medium opening degree.

[0023] Multiple small holes 111 are evenly arranged in an array along the circumference of the sleeve 1. The shape of a single small hole 111 is a circular hole and its diameter does not exceed 3 mm. During actual production, the diameter of the small holes 111 is set within 3 mm, and the distance between adjacent small holes 111 is controlled at 2 mm, which not only ensures the dense distribution of the small holes 111 in the low-section area 11 to achieve the fine adjustment function but also avoids the reduction of the structural strength of the sleeve 1 due to too small hole spacing.

[0024] The large hole 131 is rectangular, and each endpoint of the rectangle is transitioned by a rounded corner. The large hole 131 provides a broad flow passage for the fluid at a large opening degree. At the same time, the rounded corner transition reduces the fluid impact and eddy current, reducing the risk of cavitation and fluid noise.

[0025] The sealing surface of the valve core 2 is a frustum of a cone structure 21 that matches the inner wall of the sleeve 1. During assembly, the sealing surface of the valve core 2 and the inner wall of the sleeve 1 are ground through a grinding process to ensure the sealing performance between the two. This frustum of a cone structure 21 forms a conical surface contact seal when the valve core 2 is closed, effectively reducing the medium leakage amount, and also helps with the precise guiding of the valve core 2 within the sleeve 1.

[0026] The valve core 2 and the inner wall of the sleeve 1 are respectively provided with steps 22, and the steps 22 of the two abut against each other when the valve core 2 and the sleeve 1 are closed. During assembly, by adjusting the relative positions of the valve core 2 and the sleeve 1, the steps 22 of the two can accurately abut against each other when the valve core 2 and the sleeve 1 are closed. This step 22 structure not only provides a clear limit for the closing of the valve core 2, but also can share part of the fluid pressure, enhancing the sealing stability and reliability of the valve under high-pressure working conditions.

[0027] This application lists an implementable scheme. Taking the inner diameter of the sleeve 1 as 50 mm and the outer diameter as 72 mm as an example, then:

[0028] Lower section area 11: 720 circular small holes 111 are evenly distributed circumferentially, with a hole diameter of 1 mm and a center distance between adjacent holes of 1.5 mm. The flow-through area of the small holes 111 in the lower section area 11 is 720×π×(0.5)² = 565 mm².

[0029] Middle section area 12: 8 inverted triangular middle holes 121 are evenly distributed circumferentially, with a bottom side length of 15 mm, a height of 20 mm. The arcs on both sides can be regarded as straight lines, and the vertex fillet is R0.5 mm. The flow-through area of the middle holes 121 in the middle section area 12 is approximately 1200 mm².

[0030] Upper section area 13: 12 rectangular large holes 131 are evenly distributed circumferentially, with dimensions of 22 mm×10 mm and fillets at the four corners of R1 mm. The flow-through area of the large holes 131 in the upper section area 13 is approximately 2640 mm².

[0031] From the above calculations, it can be seen that the flow-through areas of the hole positions in the lower section area 11, the middle section area 12, and the upper section area 13 respectively account for about 13%, 27%, and 60% of the total flow-through area. Thus, when the valve core 2 is opened, the medium passes through the small circular holes in the lower section area 11, the inverted triangular holes in the middle section area 12, and the rectangular holes in the upper section area 13 in sequence, and the flow-through area gradually expands in a three-stage manner with the opening degree, avoiding flow rate jumps.

Claims

1. A sleeve regulating valve with a segmented regulating function, comprising a sleeve (1) and a valve core (2), wherein the valve core (2) is movably arranged in the sleeve (1), and characterized in that: The sleeve (1) comprises at least a low section (11), a middle section (12) and a high section (13) in order from bottom to top along its axial direction, and the areas of the low section (11), the middle section (12) and the high section (13) through which the medium can pass gradually increase in sequence as the opening of the valve core (2) increases; the low section (11) is arranged with a plurality of small holes (111), and the middle section (12) is evenly distributed in the circumferential direction with a plurality of inverted triangle-shaped middle holes (121) The high section (13) has a plurality of large holes (131) evenly distributed in the circumferential direction; the hole area of ​​the low section (11) through which the medium can pass accounts for between 10% and 15% of the total hole area of ​​the sleeve (1); the hole area of ​​the middle section (12) through which the medium can pass accounts for between 20% and 30% of the total hole area of ​​the sleeve (1); and the hole area of ​​the high section (13) through which the medium can pass accounts for between 55% and 65% of the total hole area of ​​the sleeve (1).

2. The sleeve regulating valve with segmented regulating function according to claim 1, characterized in that: The bottom end point of the middle hole (121) is close to the low section area (11), and the top side is close to the high section area (13). Both sides of the middle hole (121) are in the shape of concave arcs, and the three end points are rounded transitions.

3. The sleeve regulating valve with segmented regulating function according to claim 1 or 2, characterized in that: The plurality of small holes (111) are evenly arranged in an array along the circumference of the sleeve (1); each small hole (111) is in the shape of a circular hole and has a diameter not exceeding 3 millimeters.

4. The sleeve regulating valve with segmented regulating function according to claim 1 or 2, characterized in that: The large hole (131) is rectangular, and each end point of the rectangle is rounded.

5. The sleeve regulating valve with segmented regulating function according to claim 1 or 2, characterized in that: The sealing surface of the valve core (2) is a truncated cone structure (21) that matches the inner wall of the sleeve (1).

6. The sleeve regulating valve with segmented regulating function according to claim 1 or 2, characterized in that: The valve core (2) and the inner wall of the sleeve (1) are respectively provided with steps (22), and the steps (22) of the two abut against each other when the valve core (2) and the sleeve (1) are closed.

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