Anti-blocking regulating valve

Abstract

The utility model discloses an anti-blocking regulating valve which solves the problem that a throttling hole is easy to block after long-term use. A plurality of long-strip-shaped throttling holes are formed in the sleeve in the circumferential direction of the sleeve, the throttling holes extend upwards to form extending holes, the extending holes extend to the top face of the sleeve, a plurality of scraping edges are integrally arranged on the outer circumferential face of the valve element in the circumferential direction of the sleeve, and the number of the scraping edges is the same as that of the throttling holes. The scraping edge moves between the throttling hole and the extending hole along with the lifting action of the valve element, and the side wall of the scraping edge is close to the hole wall of the throttling hole. When the valve element moves up and down in the sleeve, the scraping edges can effectively remove impurities such as solid particles and fibers attached to the edge and the interior of the throttling hole, so that the possibility of blockage is reduced, and the stability and the accuracy of the regulating valve in long-term use are ensured; in addition, as the side walls of the scraping edges are close to the hole walls of the throttling holes, the throttling holes can be effectively cleaned under the condition that the operating force is not obviously increased, and smooth medium circulation is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating valves, in particular to an anti-clogging regulating valve. Background Technique

[0002] As an important control element in industrial processes, regulating valves are widely used in the regulation of parameters such as flow rate and pressure. The sleeve-type regulating valve has become a common form due to its compact structure and high regulating accuracy. It changes the flow area through the relative movement between the throttle holes opened on the sleeve surface and the valve core to achieve the control of the medium flow rate. However, in working conditions with solid particles, fibers or high-viscosity media, such regulating valves expose significant defects when facing complex media.

[0003] When the medium contains solid particles or fibers, the particles are likely to stay and accumulate at the edges of the throttle holes, and fiber-like impurities may get entangled and jammed in the window gaps; the high-viscosity medium will adhere to the inner wall of the window to form a retention layer, resulting in a reduction in the effective cross-sectional area of the throttle channel. The above problems will not only reduce the throttling accuracy of the regulating valve and distort the control characteristics, but may also cause the valve core to jam and malfunction severely, forcing the system to stop for maintenance.

[0004] Taking the paper-making industry as an example, the fibers and filler particles contained in the pulp are easy to wind and agglomerate at the sleeve throttle holes, causing local blockage, affecting the pulp supply stability of the paper machine headbox, and even triggering paper breakage accidents; crystalline media such as ammonium sulfate solution and sodium chloride solution in the chemical industry precipitate crystalline particles due to pressure changes during throttling, accumulate at the throttle holes to form hard scale, resulting in the malfunction of the regulating valve and requiring frequent disassembly and cleaning, increasing the equipment maintenance cost and the risk of production interruption.

[0005] In the prior art, some solutions improve the blockage problem by increasing the throttle hole size, optimizing the flow channel chamfer or using wear-resistant materials, etc., but still cannot fundamentally solve the physical mechanism of impurity retention, and may deteriorate the throttling characteristics or increase the manufacturing cost due to structural changes. Content of the Utility Model

[0006] The purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides an anti-clogging regulating valve to solve the problem that the throttle holes are easy to be blocked after long-term use.

[0007] The technical solution of the utility model: It includes a valve core, a sleeve and a valve body. The valve core is arranged to move up and down inside the sleeve, and the sleeve is fixed inside the valve body; a plurality of strip-shaped throttle holes are opened on the sleeve along its circumferential direction, the throttle holes extend upward to form extension holes, and the extension holes extend to the top surface of the sleeve. A plurality of scraping edges are integrally arranged on the outer peripheral surface of the valve core along its circumferential direction. The number of the scraping edges is the same as that of the throttle holes. The scraping edges move between the throttle holes and the extension holes along with the up and down movement of the valve core, and the side wall of the scraping edge is close to the hole wall of the throttle hole.

[0008] With the above technical solution, by using a valve core with scraping edges and making the number of scraping edges consistent with the number of throttle holes, when the valve core moves up and down in the sleeve, these scraping edges can effectively remove impurities such as solid particles and fibers attached to the edges and inside of the throttle holes. In this way, not only the possibility of blockage is reduced, but also the stability and accuracy during the long-term use of the regulating valve are ensured. In addition, since the side wall of the scraping edge is close to the hole wall of the throttle hole, the throttle hole can be effectively cleaned without significantly increasing the operating force, keeping the medium flow unobstructed.

[0009] In a possible design, a connecting body is arranged on the outer side of the extension hole, and the connecting body is integrally formed with the sleeve.

[0010] With the above design, by increasing the material thickness around the extension hole, the circumferential strength reduction of the sleeve caused by opening the through extension hole is offset, enhancing the overall structural strength of the sleeve and avoiding the situation that the sleeve is bent or deformed due to the setting of the extension hole.

[0011] In a possible design, the bottom side of the sleeve abuts against the valve body, and an annular groove is provided between the bottom side of the sleeve and the connecting body.

[0012] With the above design, the annular groove thins the barrel wall at the throttle hole, making the scraping edge fit the wall thickness at the throttle hole, ensuring that the scraping edge can cover the throttle hole and further improving the anti-blocking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a sectional view of the whole of the present utility model;

[0014] Figure 2 is a schematic structural diagram of the valve core and the sleeve in the closed state of the present utility model;

[0015] Figure 3 is a sectional view of the valve core and the sleeve in the closed state of the present utility model;

[0016] Figure 4 is a schematic structural diagram of the valve core and the sleeve in the open state of the present utility model;

[0017] Figure 5 is an exploded view of the valve core and the sleeve of the present utility model;

[0018] Among them, 1, valve core; 11, scraping edge; 2, sleeve; 21, throttle hole; 22, extension hole; 23, connecting body; 24, annular groove; 3, valve body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] As Figures 1 - 5A clog - proof regulating valve shown in the figure includes a valve core 1, a sleeve 2, and a valve body 3. The valve core 1 is arranged to move up and down within the sleeve 2, and the sleeve 2 is fixed within the valve body 3. A number of long - strip throttle holes 21 are provided along the circumferential direction of the sleeve 2. The setting direction of the throttle holes 21 is consistent with the height direction of the sleeve 2. The throttle holes 21 are evenly distributed along the circumferential direction of the sleeve, and the adjacent hole spacing is equal to avoid the uneven flow of the medium. The throttle holes 21 extend upward to form extension holes 22, and the extension holes 22 extend to the top surface of the sleeve 2, which means that the throttle holes 21 and the extension holes 22 are interconnected and extend to the topmost surface along the height direction of the sleeve 2. A number of scraping edges 11 are integrally arranged along the circumferential direction of the outer peripheral surface of the valve core 1. The number of scraping edges 11 is the same as the number of throttle holes 21, for example, between six and twenty, and they correspond to each other in the circumferential position. The scraping edges 11 move between the throttle holes 21 and the extension holes 22 along with the lifting movement of the valve core 1, and the width of the scraping edges 11 is adapted to the hole width of the throttle holes 21, so that the side wall of the scraping edge 11 is close to the hole wall of the throttle hole 21. For example, the distance between the side wall of the scraping edge 11 and the hole wall of the throttle hole 21 is controlled within 0.1 - 0.5 mm, and it can also be adjusted according to the particle size of the medium to ensure close contact and no jamming. When the regulating valve works, the medium flows through the throttle holes 21 on the sleeve 2. Since the medium may contain solid particles or fibers, these substances are likely to gradually accumulate around the throttle holes 21 and cause blockage. However, as the valve core 1 moves up and down, the scraping edges 11 thereon will move along the throttle holes 21 and their extension holes 22, scraping off the impurities attached to the hole wall and leaving the throttle holes 21 with the flow of the medium, thus keeping the throttle holes 21 unobstructed. In this way, during the reciprocating movement of the valve core 1, the high - viscosity medium retention layer attached to the hole wall can be scraped off in real - time, as well as the solid particles and fiber impurities stuck at the edge of the throttle holes 21, avoiding the long - term retention and accumulation of impurities, achieving self - cleaning in cooperation with the flow of the medium, and reducing the frequency of manual disassembly and cleaning. The fact that the extension holes 22 penetrate the top surface of the sleeve 2 can also facilitate the docking and assembly with the valve core 1 and reduce the assembly difficulty. The shape of the scraping edges 11 can be a cuboid, or sharp corners can be provided on both sides of the top surface and both sides of the bottom surface in the height direction of the scraping edges 11 to facilitate scraping the accumulated substances and improve the cleaning effect.

[0020] In order to compensate for the possible decrease in the strength of the sleeve 2 caused by the opening of the extension holes 22, a connecting body 23 can be provided at the edge of the top surface of the sleeve 2, that is, outside the extension holes 22. The connecting body 23 is integrally formed with the sleeve 2, and the connecting body 23 is equivalent to filling the through - hole left by the original opening. This not only enhances the overall structural strength of the sleeve 2 but also prevents the sleeve 2 from deforming under the impact of high - pressure medium, ensuring the long - term stability of the matching precision between the throttle holes 21 and the scraping edges 11.

[0021] Due to the existence of the connecting body 23, the height by which the scraping edge 11 protrudes from the outer peripheral surface of the valve core 1 is slightly smaller than the wall thickness at the throttle hole 21, making it difficult for the scraping edge 11 to touch the hole wall of the throttle hole 21 near the outer peripheral surface of the sleeve 2, and deposits are still likely to occur at this position. Therefore, the bottom side of the sleeve 2 abuts tightly against the inside of the valve body 3, and a ring groove 24 is provided between the bottom side of the sleeve 2 and the connecting body 23 to reduce the thickness of the barrel wall where the throttle hole 21 is located, making it compatible with the width of the scraping edge 11, ensuring that the height of the scraping edge 11 can completely cover the throttle hole 21 area and achieving the best anti-blocking effect. A wear-resistant coating such as tungsten carbide can be sprayed on the surface of the scraping edge 11, and the sleeve 2 is made of stainless steel or Hastelloy to withstand the erosion of particulate media.

Claims

1. An anti-clogging regulating valve, comprising a valve core (1), a sleeve (2) and a valve body (3), wherein the valve core (1) is placed in the sleeve (2) for lifting and lowering movement, and the sleeve (2) is fixed in the valve body (3), characterized in that: The sleeve (2) is provided with a plurality of long strip-shaped throttling holes (21) along its circumferential direction, the throttling holes (21) extending upward to form extension holes (22), the extension holes (22) extending to the top surface of the sleeve (2), the outer circumferential surface of the valve core (1) is integrally provided with a plurality of scraping edges (11) along its circumferential direction, the number of the scraping edges (11) being the same as the number of the throttling holes (21), the scraping edges (11) moving between the throttling holes (21) and the extension holes (22) as the valve core (1) rises and falls, and the side walls of the scraping edges (11) are close to the hole walls of the throttling holes (21).

2. The anti-clogging regulating valve according to claim 1, characterized in that: A connecting body (23) is provided on the outer side of the extension hole (22); the connecting body (23) and the sleeve (2) are integrally formed.

3. The anti-clogging regulating valve according to claim 2, characterized in that: The bottom side of the sleeve (2) is closely attached to the inside of the valve body (3), and an annular groove (24) is provided between the bottom side of the sleeve (2) and the connecting body (23).

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