A soft sealing gate valve against scouring

Abstract

The utility model provides a kind of anti-scouring soft sealing gate valve, including valve body and upper valve cover and the valve body flow channel being arranged at both ends of valve body, the inside of valve body and upper valve cover is equipped with gate and valve stem jointly, gate is connected with valve stem, valve stem lifts and controls gate to move up and down, since the utility model is provided with the sealing ring with groove in the contact surface of gate and sealing gate base, the structure itself has good resilience characteristics, secondly, hard sealing ring of hollow is embedded in groove innovatively, this design not only enhances the overall structural strength of sealing ring, more using the deformability of hollow structure, additional, lasting elastic compensation is provided for sealing surface, when sealing surface occurs slight wear under long-term use or working condition fluctuation, the composite sealing structure can automatically rebound compensation under the sustained pressure provided by spring through connecting seat, always maintain tight sealing contact, which effectively solves the problem that traditional sealing is easy to fail due to wear or plastic deformation.

Description

Technical Field

[0001] This utility model relates to the technical field of gate valves, specifically to an anti-erosion soft-seal gate valve. Background Technology

[0002] Soft-seal gate valves are a type of gate valve. They are named for the fact that their sealing surfaces form a wedge shape with the vertical centerline. Generally, gate valves with wedge-shaped sealing surfaces are suitable for low-pressure applications or applications involving the transport of media. Wedge gate valves are further divided into rising stem gate valves and non-rising stem gate valves, as well as wedge single gate valves and wedge double gate valves.

[0003] According to Chinese patent number "CN 219655307 U", a wedge gate valve with anti-erosion capability is disclosed, including a wedge gate valve body. A flange 1 is fixed to the surface of the wedge gate valve body. A flange 2 is connected to the flange 1 by bolts. A valve seat is fixed to the side of the flange 2 away from the flange 1. A threaded rod is passed through the valve seat. When the wedge gate valve body needs to be connected, the flange 2 is placed on the surface of the flange 1, so that the connecting plate and the connecting column enter the circular slide groove. At this time, the flange 2 is pressed down, and then the flange 2 is rotated clockwise, so that the surface of the circular slide plate will abut against the connecting plate, and then the side of the connecting plate away from the circular slide plate abuts against the surface of the limiting plate, thus initially stabilizing the flange 1 and flange 2. At this time, no personnel support is required, and the bolts can be used directly for tightening.

[0004] During the assembly of the aforementioned erosion-resistant gate valve, the connecting plate, connecting column, and circular plate are arranged to ensure that the connecting plate is away from the side of the circular sliding plate and abuts against the surface of the limiting plate, thus initially stabilizing the flange and facilitating subsequent assembly and fixing. However, in actual use, the sealing performance of the gate plate and gate seat inside the gate valve is not ideal, and the baffle and sealing gasket only protect the two sides of the gate plate. The protection structure is relatively simple and cannot meet the needs of conveying fluids with a large amount of particulate impurities. Utility Model Content

[0005] The purpose of this invention is to provide an anti-erosion soft-seal gate valve to solve the problems mentioned in the background art.

[0006] The technical solution adopted to solve the above technical problems is:

[0007] An anti-erosion soft-seal gate valve includes a valve body, an upper valve cover, and valve body flow channels at both ends of the valve body. The valve body and upper valve cover share a gate and a valve stem. The gate is connected to the valve stem. Matching sealing seats are provided on the sealing surfaces of both sides of the gate. A sealing ring with an internal groove is provided on the contact surface of the gate and the sealing seat. A hollow hard sealing ring is provided within the groove, enhancing the sealing ring's resilience and sealing ability. An elastic element is fitted on the outer side of the valve stem, with connecting seats connected to both ends. An elastic ring is provided on the inner wall of the upper connecting seat, and the inner wall of the elastic ring makes movable contact with the valve stem wall. Protective structures are provided on the inner walls of the valve body flow channels on both sides.

[0008] As a preferred technical solution of this utility model, the sealing gate seat has a groove on the side near the sealing surface, and the sealing ring is connected in the groove and adapted to the gate plate.

[0009] As a preferred technical solution of this utility model, the elastic element is a spring sleeved on the outer wall of the valve stem, and the upper end of the spring is fixed on the corresponding connecting seat. The top and bottom of the two connecting seats are respectively connected and fixed to the upper valve cover and the gate by bolts.

[0010] As a preferred technical solution of this utility model, the protective structure is a spiral groove arranged in opposite directions along the inner wall of the channel, and the inner wall surface of the groove is coated with a layer of high-strength ceramic matrix composite material.

[0011] As a preferred technical solution of this utility model, the top of the upper valve cover is connected to a mounting platform, and at least two locking bolts are rotatably arranged inside the mounting platform. A sealing pressure plate is sleeved on the outer wall of the locking bolts. The lower end of the sealing pressure plate abuts against the sealing opening at the top of the upper valve cover. The bottom of the upper valve cover is connected to the top of the valve body by fixing bolts. The upper end of the valve stem passes through the sealing pressure plate and extends upward.

[0012] As a preferred embodiment of this utility model, a protective cylinder is threadedly connected to the outer wall of the valve stem, and the lower end of the protective cylinder is rotatably connected to the top of the sealing pressure plate.

[0013] As a preferred technical solution of this utility model, a rotating handle is installed on the outer wall of the protective cylinder, and a flow-blocking protrusion is provided on the bottom side of the protective cylinder near the center. The bottom of the flow-blocking protrusion is fixed on the top of the sealing pressure plate.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. Significantly improves sealing performance and durability, ensuring long-term reliable sealing.

[0016] To address the shortcomings of existing technologies in terms of the unsatisfactory sealing performance of gates and gate seats, this invention achieves a significant improvement in sealing efficiency through the synergistic effect of multiple structures. First, a grooved sealing ring is set on the contact surface between the gate and the sealing seat. This structure itself has good rebound characteristics. Second, a hollow hard sealing ring is innovatively embedded in the groove. This design not only enhances the overall structural strength of the sealing ring, but also utilizes the deformability of the hollow structure to provide additional and durable elastic compensation for the sealing surface. When the sealing surface experiences slight wear under long-term use or fluctuating operating conditions, this composite sealing structure can automatically rebound and compensate under the continuous pressure provided by the spring through the connecting seat, always maintaining a tight sealing contact. This effectively solves the problem of traditional seals failing due to wear or plastic deformation, making the valve's sealing ability more durable and reliable, and greatly extending its maintenance cycle and service life.

[0017] 2. Construct an active fluid protection mechanism to effectively resist erosion and wear.

[0018] To address the limitations of simple and ineffective protective structures in existing technologies, this invention features a unique protective structure on the inner wall of the valve body's flow channel. This structure goes beyond simply increasing the wear-resistant layer thickness; instead, it employs spiral grooves arranged in opposite directions along the inner wall of the channel, with a high-strength ceramic matrix composite material laminated onto the groove surface. This design constitutes an advanced anti-erosion system combining active guidance and passive protection. Its working principle is as follows: the spiral grooves guide the fluid to generate a controllable secondary vortex. The centrifugal effect of this vortex throws denser solid particles in the fluid towards the center of the flow channel, achieving solid-liquid separation and keeping abrasive particles away from the valve body's inner wall, thus reducing direct erosion at its source. Simultaneously, this optimized flow field reconstructs the boundary layer near the wall, suppressing the generation of local eddies and cavitation. The high-strength ceramic layer acts as a final line of defense, resisting the impact of residual particles. Compared to traditional single-structure passive protection, this composite protection mechanism offers higher anti-erosion efficiency and more significant effects, comprehensively improving the valve's durability under harsh operating conditions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the main cross-sectional structure of the present utility model;

[0021] Figure 3 for Figure 2 A partial magnified view.

[0022] In the diagram: 1. Valve body; 2. Valve body flow channel; 3. Upper valve cover; 4. Gate; 5. Sealing gate seat; 6. Sealing ring; 61. Hard sealing ring; 7. Protective structure; 8. Valve stem; 9. Spring; 10. Connecting seat; 11. Mounting platform; 12. Sealing pressure plate; 13. Protective cylinder; 14. Rotating handle; 15. Flow-blocking boss. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0028] Example 1

[0029] exist Figures 1-3This utility model provides a technical solution: an anti-erosion soft-seal gate valve, the main body of which includes a valve body 1, an upper valve cover 3, and valve body flow channels 2 disposed at both ends of the valve body 1. The valve body 1 and the upper valve cover 3 are both internally provided with a gate plate 4 and a valve stem 8. The gate plate 4 is connected to the valve stem 8. The lifting and lowering of the valve stem 8 controls the up and down movement of the gate plate 4. Both sides of the gate plate 4 are provided with matching sealing seats 5. During the lifting and lowering process, the gate plate 4 cooperates with the sealing seats 5 to realize the opening and closing of the valve. Simultaneously, a sealing ring 6 with an internal groove is provided on the contact surface of the gate plate 4 and the sealing seat 5. A hollow hard sealing ring 61 is provided in the groove. The sealing ring 6 itself has resilience, which, together with the hard sealing ring 61 set in the groove, greatly improves the resilience of the sealing structure. Together with the sealing gate seat 5, it further improves the sealing performance with the gate plate 4 in the closed state, thus improving the sealing effect and making the resilience sealing ability of the sealing ring 6 more durable. An elastic element is sleeved on the outside of the valve stem 8, and both ends of the elastic element are connected to the connecting seat 10. The inner wall of the upper connecting seat 10 is provided with an elastic ring. The inner wall of the elastic ring is in active contact with the stem wall of the valve stem 8. The setting of the sealing ring prevents fluid from entering the opening inside the upper valve cover 3, reduces contact with the sealing structure inside the upper valve cover 3, and improves the service life of the equipment.

[0030] In one aspect of this embodiment, the sealing gate seat 5 has a groove on the side near the sealing surface, and the sealing ring 6 is connected in the groove and adapted to the gate plate 4.

[0031] In one aspect of this embodiment, the elastic component is a spring 9 sleeved on the outer wall of the valve stem 8, the upper end of the spring 9 is fixed on the corresponding connecting seat 10, and the top and bottom of the two connecting seats 10 are respectively connected and fixed to the upper valve cover 3 and the gate 4 by bolts.

[0032] In one aspect of this embodiment, the protective structure 7 is specifically a spiral groove arranged facing each other along the inner wall of the channel, and the inner wall surface of the groove is laminated with a high-strength ceramic matrix composite material. The spiral groove provides the fluid with a tangential velocity component, guiding the fluid to generate a secondary flow (spiral forward). This secondary flow effect has two benefits:

[0033] Centrifugal separation: Denser solid particles are thrown towards the center of the channel during rotation, instead of moving close to the wall, thus achieving "solid-liquid separation" and keeping the particles away from the wall.

[0034] Boundary layer reconstruction: Helical flow can disturb and stabilize the boundary layer in the near-wall region, preventing the formation of local low-pressure areas and cavitation, which is also one of the important reasons for scouring.

[0035] In one aspect of this embodiment, a mounting platform 11 is connected to the top of the upper valve cover 3. At least two locking bolts are rotatably installed inside the mounting platform 11. A sealing pressure plate 12 is sleeved on the outer wall of the locking bolts. The lower end of the sealing pressure plate 12 abuts against the sealing opening at the top of the upper valve cover 3. The bottom of the upper valve cover 3 is connected to the top of the valve body 1 by fixing bolts. The upper end of the valve stem 8 passes through the sealing pressure plate 12 and extends upward. A protective cylinder 13 is threadedly connected to the outer wall of the valve stem 8. The lower end of the protective cylinder 13 is rotatably connected to the top of the sealing pressure plate 12. The protective cylinder 13 covers the outer valve stem 8 inside, preventing contact with the outside world, preventing the valve stem 8 from being corroded, and improving the service life of the valve stem 8.

[0036] In one aspect of this embodiment, a rotating handle 14 is installed on the outer wall of the protective cylinder 13. The rotating handle 14 facilitates the rotation of the protective cylinder 13. A flow-blocking boss 15 is provided on the bottom side of the protective cylinder 13 near the center. The bottom of the flow-blocking boss 15 is fixed on the top of the sealing pressure plate 12. The flow-blocking boss 15 prevents external rainwater and other substances from moving to the top opening of the upper valve cover 3 and prevents the internal sealing structure from being corroded.

[0037] The working principle of this utility model is as follows: The overall operation principle of this anti-erosion soft-seal gate valve is as follows: When the valve needs to be closed, the operator rotates the handle 14 clockwise, which drives the connected protective cylinder 13 to rotate. Since the protective cylinder 13 is connected to the valve stem 8 by a thread and its lower end is rotatably connected to the sealing pressure plate 12, the rotation of the protective cylinder 13 will drive the valve stem 8 to move downward in a straight line. The valve stem 8 drives the gate plate 4 at its bottom to move downward together, so that the sealing surfaces on both sides gradually press against the corresponding sealing gate seat 5. During this process, the spring 9 pre-installed on the outside of the valve stem 8 is compressed and accumulates elastic force. The final seal of the gate plate 4 is achieved by the sealing ring 6 on its contact surface with the sealing gate seat 5. The sealing ring 6 has a groove inside and is embedded with a hollow hard sealing ring 61. When squeezed, it generates elastic deformation to ensure a tight fit, thereby forming the first reliable seal. The continuous pressure provided by the spring 9 is transmitted to the entire system through the connecting seat 10 to ensure the sealing pair The valve maintains stable contact stress even under pressure fluctuations, making the rebound sealing ability of the sealing ring 6 more durable. When the valve is opened, the handle 14 is rotated counterclockwise, and the valve stem 8 drives the gate 4 to move upward, disengaging from the sealing gate seat 5, and the fluid passage is opened. At this time, the spring 9 releases energy to assist the lifting process and maintain system stability. When the fluid passes through the valve body flow channel 2, the protective structure 7 set on its inner wall begins to play a key role. This structure is a spiral groove with opposite sides, and its surface is composited with high-strength ceramic matrix composite material. The fluid flowing through this is guided to generate a rotating secondary flow. The centrifugal force generated by this swirling flow throws solid particles in the fluid toward the center of the flow channel, effectively avoiding direct scouring of the inner wall of the channel by the particles. At the same time, it optimizes the flow state in the near-wall area and inhibits cavitation. This mechanism, which combines active guidance and passive wear resistance, significantly improves the valve's anti-scouring ability and service life under particulate fluid conditions, meeting the needs of most particulate fluid transportation.

[0038] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An anti-erosion type soft-seal gate valve, comprising a valve body (1), an upper valve cover (3), and valve body flow channels (2) disposed at both ends of the valve body (1), characterized in that: The valve body (1) and the upper valve cover (3) are provided with a gate plate (4) and a valve stem (8) inside. The gate plate (4) is connected to the valve stem (8). The sealing surfaces on both sides of the gate plate (4) are provided with matching sealing gate seats (5). The contact surfaces of the gate plate (4) and the sealing gate seats (5) are provided with a sealing ring (6) with an internal groove. The groove is provided with a hollow hard sealing ring (61) so that the sealing ring (6) itself has a more durable rebound sealing ability. The valve stem (8) is fitted with an elastic element on the outside. Both ends of the elastic element are connected to a connecting seat (10). The inner wall of the upper connecting seat (10) is provided with an elastic ring. The inner wall of the elastic ring is in contact with the stem wall of the valve stem (8). The inner walls of the valve body flow channels (2) on both sides are provided with protective structures (7).

2. The anti-erosion soft-seal gate valve according to claim 1, characterized in that: The sealing gate seat (5) has a groove on the side near the sealing surface, and the sealing ring (6) is connected in the groove and is adapted to the gate plate (4).

3. The anti-erosion soft-seal gate valve according to claim 1, characterized in that: The elastic element is a spring (9) sleeved on the outer wall of the valve stem (8). The upper end of the spring (9) is fixed on the corresponding connecting seat (10). The top and bottom of the two connecting seats (10) are respectively connected and fixed to the upper valve cover (3) and the gate (4) by bolts.

4. The anti-erosion soft-seal gate valve according to claim 1, characterized in that: The protective structure (7) is a spiral groove arranged in opposite directions along the inner wall of the channel, and the inner wall surface of the groove is coated with a layer of high-strength ceramic matrix composite material.

5. The anti-erosion soft-seal gate valve according to claim 1, characterized in that: The top of the upper valve cover (3) is connected to a mounting platform (11). The mounting platform (11) is rotatably equipped with at least two locking bolts. A sealing pressure plate (12) is sleeved on the outer wall of the locking bolts. The lower end of the sealing pressure plate (12) abuts against the sealing opening at the top of the upper valve cover (3). The bottom of the upper valve cover (3) is connected to the top of the valve body (1) by fixing bolts. The upper end of the valve stem (8) passes through the sealing pressure plate (12) and extends upward.

6. The anti-erosion soft-seal gate valve according to claim 5, characterized in that: The outer wall of the valve stem (8) is threaded with a protective sleeve (13), and the lower end of the protective sleeve (13) is rotatably connected to the top of the sealing pressure plate (12).

7. The anti-erosion soft-seal gate valve according to claim 6, characterized in that: The outer wall of the protective cylinder (13) is equipped with a rotating handle (14), and the bottom of the protective cylinder (13) near the center is provided with a flow-blocking boss (15), the bottom of which is fixed on the top of the sealing pressure plate (12).

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