Strong sealing type gate valve
By employing a mechanical locking and sealing structure of grooves and bosses in the gate valve, the sealing and durability issues of the gate valve are solved, improving the sealing performance and service life of the gate valve, while reducing the driving force requirement and achieving energy conservation and emission reduction.
Patent Information
- Application Number
- CN202422912492.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Gate valves suffer from poor durability, inadequate sealing, and unsuitable drive mechanisms during use, leading to fluid leakage and unstable equipment operation.
The gate is closed by using a sealing method in which the groove of the gate plate matches the boss of the lower valve seat cavity, forming a five-seal structure. The mechanical engagement of the trapezoidal boss and the groove achieves the closure of the gate plate, reducing the driving force requirement.
This improved the sealing performance and service life of the gate valve, reduced maintenance costs, and achieved energy conservation and emission reduction.
Smart Images
Figure CN223768140U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gate valve technology, and in particular to a strong sealing gate valve. Background Technology
[0002] Gate valves, as a common type of pipeline equipment, are widely used in various fields such as industry, construction, and municipal engineering. Their main function is to control the flow of fluids, achieving opening and closing operations through the raising and lowering of the gate. However, gate valves also present some technical problems and challenges during use.
[0003] First, the durability of gate valves is a common challenge. Second, sealing is also crucial, as it directly affects the valve's performance and safety. Poor sealing will lead to fluid leakage, affecting the normal operation of the equipment. In particular, wear on the gate seals is a significant cause of poor sealing in gate valves.
[0004] Furthermore, the actuation mechanism of gate valves is also a significant issue. The actuation mechanism of an electric gate valve includes a motor, stroke controller, and reducer; the quality and reliability of these components determine the valve's operational performance. It needs to have sufficient torque and speed and be adaptable to various working environments. However, the current method of using high pressure to drive the gate to close is a direct cause of seal damage and reduced valve lifespan. Utility Model Content
[0005] To solve the above-mentioned technical problems, this utility model proposes a strong sealing gate valve, including a valve seat, a gate, and a drive rod, wherein the drive rod controls the opening and closing degree of the gate;
[0006] The valve seat includes a lower valve seat and an upper valve seat; the lower valve seat has a lower valve seat cavity inside, which is a cavity through which fluid passes; the upper valve seat has an upper valve seat cavity inside, which is a retraction space when the gate is opened;
[0007] When the gate is fully closed, the outer circumferential surface of the gate and the inner wall of the lower valve seat cavity achieve mechanical engagement and sealing through a locking element.
[0008] Furthermore, the inner wall of the lower valve seat cavity is provided with radial bosses in a direction perpendicular to the inner wall surface, and the outer peripheral surface of the gate is embedded with continuous grooves. The radial bosses and continuous grooves cooperate with each other to seal, forming the engaging element.
[0009] Furthermore, the groove has an inner sidewall and a bottom wall, and the surfaces of the inner sidewall and the bottom wall form a sealing surface. When the groove of the gate plate is fully engaged with the boss of the lower valve seat cavity, the sealing surface formed by the inner sidewall and the top wall of the groove is squeezed and rubbed against the top and side surfaces of the boss, thereby forming a multi-seal structure.
[0010] Furthermore, the cross-section of the boss is trapezoidal, the thickness of the boss gradually decreases in the direction away from the inner wall of the lower valve seat cavity, and the angle between the top surface of the boss and the two side surfaces is an obtuse angle, namely angle θ1 and angle θ2; the angles θ1 and θ2 are adjusted according to the flow direction of the fluid and the type of fluid.
[0011] Furthermore, the top surface of the boss is chamfered at the connection point with the two side surfaces.
[0012] Furthermore, the inner wall of the lower valve seat cavity and the boss are integrally formed by machining.
[0013] Furthermore, the body of the gate is formed by processing an elastic sealing material, and the sealing surface is formed by directly processing a groove.
[0014] Furthermore, the sealing surface is formed by coating the inner sidewalls and bottom wall surfaces of the groove with a sealing material.
[0015] Furthermore, two or more bosses are provided in the axial direction of the valve body, and two or more grooves are provided in the axial direction of the gate plate.
[0016] Furthermore, the gate has two sides and a bottom surface. The upper semicircle of the gate has an ear protruding outward along its axial direction. The ear and the grooves embedded in the two sides cooperate with the valve seat engaging element, so that the gate can retract and extend within the upper valve seat cavity. When the gate is about to close, the groove embedded in the bottom surface of the gate engages with the boss in the lower valve seat cavity and continues to move downward until it is fully engaged.
[0017] Compared with the prior art, the present invention has the following beneficial technical effects:
[0018] This utility model proposes a strong sealing gate valve, which has the following advantages:
[0019] 1. A sealing method employing the mating of the gate's grooves and the bosses in the lower valve seat cavity creates a seal at each contact surface between the bosses and grooves, resulting in a five-seal structure. Even if any one of these seals malfunctions, the others will still maintain a good sealing effect unless all five seals fail. This five-seal structure significantly reduces maintenance costs. Furthermore, multiple bosses can be positioned along the axial direction of the fluid-passing cavity, corresponding to multiple grooves on the gate, achieving an even stronger sealing structure through the interaction of these multiple bosses and grooves.
[0020] 2. In traditional gate valves, the gate plate wears down after repeated opening and closing. Once a gap forms, the sealing effect deteriorates, and the service life is affected. This invention uses a trapezoidal boss and groove. Even if the top of the boss or groove wears down during repeated opening and closing, the gate plate, being narrower at the top and wider at the bottom, will automatically slide down under the influence of gravity and driving force during closure, still achieving an effective seal. This provides excellent compensation and increases the service life of the gate valve by at least 100%.
[0021] 3. Compared to traditional gate valves, the gate requires increasing driving force as it descends during closure. This invention utilizes a combination of a boss and a groove. As the gate descends, the side of the boss gradually engages with the side of the groove, effectively blocking the fluid. This significantly reduces the driving force required for further closure, decreasing it by more than 50%. This achieves energy conservation and emission reduction, laying the foundation for industrial upgrading, transformation, and green development. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 A schematic diagram of the opening state of the strong-sealing gate valve of this utility model;
[0024] Figure 2 A schematic diagram of the closed state of the strong-sealing gate valve of this utility model;
[0025] Figure 3 A schematic diagram of the gate engagement element and the lower valve seat engagement element of this utility model;
[0026] Figure 4 A front view of the gate of this utility model;
[0027] Figure 5 A schematic diagram of the gate groove structure of this utility model;
[0028] Figure 6 A schematic diagram of the cross-section of the boss in the lower valve seat cavity of this utility model;
[0029] Figure 7 A schematic diagram of the gate of this utility model having a single groove set axially in the lower valve seat cavity;
[0030] Figure 8 A schematic diagram of the gate of this utility model having multiple grooves arranged axially in the lower valve seat cavity;
[0031] Figure 9 This utility model is a schematic diagram of the boss and fluid parameters. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0033] In the accompanying drawings of the specific embodiments of this utility model, in order to better and more clearly describe the working principle of each component in the system and show the connection relationship of each part in the device, only the relative positional relationship between each component is clearly distinguished. It does not constitute a limitation on the signal transmission direction, connection sequence, or size, dimension, and shape of each part within the component or structure.
[0034] Example 1
[0035] like Figure 1 The diagram shown is a schematic of the open state of a strong-sealing gate valve. The strong-sealing gate valve includes a valve seat 1, a gate 2, and a drive rod (not shown). The gate 2 and the drive rod are connected by a drive mechanism. The drive rod controls the opening and closing of the gate 2, thereby controlling the flow rate of fluid passing through the valve seat 1.
[0036] like Figure 2 The diagram shows the closed state of a strong-sealing gate valve. The valve seat 1 includes a lower valve seat 11 and an upper valve seat 12. The lower valve seat 11 has a lower valve seat cavity with a circular radial cross-section, which is the cavity through which fluid passes. The upper valve seat 12 has an upper valve seat cavity, which serves as the retraction space when the gate 2 is open. When the gate is fully retracted into the upper valve seat cavity, the gate is fully open, allowing unobstructed flow of fluid within the lower valve seat cavity. The degree of gate opening controls the flow rate and velocity of the fluid, achieving precise flow regulation.
[0037] In the prior art, when the gate is fully closed under high pressure driven by the drive rod, the gate and the lower surface of the lower valve seat cavity are strictly sealed. Both the lower surface of the gate and the lower surface of the lower valve seat cavity are smooth surfaces. At this time, the sealing element on the lower surface of the gate undergoes elastic deformation in the direction perpendicular to the lower surface of the lower valve seat cavity, achieving tight compression between the sealing element and the lower surface of the lower valve seat cavity, thereby completely blocking the passage of fluid and achieving a sealing effect.
[0038] In this invention, the gate achieves complete closure and liquid sealing not through high-pressure drive of the drive rod, but through mechanical engagement. That is, the lower surface of the gate and the lower surface of the lower valve seat cavity are not smooth surfaces, but each has its own engagement element, which will be described in detail below.
[0039] like Figure 3 The diagram shows the structure of the gate engaging element and the lower valve seat engaging element. The inner wall 11a of the lower valve seat cavity is provided with a radial boss 13 in a direction perpendicular to the inner wall surface. The radial boss 13 serves as the engaging element of the lower valve seat. The outer peripheral surface of the gate is embedded with a continuous groove 21, which serves as the engaging element of the gate.
[0040] like Figure 4 The diagram shows a front view of the gate 2. The gate 2 has two sides 2a and a bottom surface 2b. An ear 2c protrudes axially outward from the outer circumference of the upper semicircle of the gate 2. The ear 2c and the groove 21 embedded in the side surface 2a are used to engage with the upper valve seat engaging element, allowing the gate 2 to retract and extend within the upper valve seat cavity. When the gate 2 is about to close, the groove 21 embedded in the bottom surface 2b of the gate 2 engages with the boss 13 in the lower valve seat cavity and continues to move downwards until... Figure 2 The fully engaged state is shown.
[0041] like Figure 5 The diagram shown is a schematic of the gate groove structure. Figure 6 The diagram shows a cross-sectional view of the boss in the lower valve seat cavity. The gate groove 21 has an inner sidewall 21a and a bottom wall 21b. The surfaces of the inner sidewall 21a and the bottom wall 21b form sealing surfaces. When the groove 21 embedded in the bottom surface 2b of the gate 2 is fully engaged with the boss 13 in the lower valve seat cavity, the sealing surfaces formed by the inner sidewall and top wall of the gate groove 21 are squeezed and rubbed against the top and side surfaces of the boss, forming a seal at the contact surfaces at points ①②③④⑤, thus forming a multi-layer sealing structure. Therefore, if the sealing surface on one side is damaged due to the presence of foreign matter, the sealing surface on the other side and the sealing surface of the top wall continue to serve as a sealing barrier. The gate body can be integrally machined using elastic materials such as rubber, so that the surfaces of the inner sidewall and top wall of the directly machined groove directly form sealing surfaces; if the gate body is made of rigid material, a certain thickness of sealing material can be coated on the integrally machined rigid groove to form a sealing surface.
[0042] The cross-section of the boss 13 is trapezoidal, and its thickness gradually decreases away from the inner wall of the lower valve seat cavity. The angles between the top surface of the boss and its two side surfaces are obtuse angles, θ1 and θ2, respectively. Angles θ1 and θ2 are adjusted according to the flow direction and type of fluid. The connection between the top surface of the boss and its two side surfaces is chamfered to prevent the accumulation of foreign objects and to prevent damage to the sealing surface due to foreign objects. The inner wall of the lower valve seat cavity and the boss are formed integrally, simplifying the manufacturing process.
[0043] like Figure 7 , Figure 8 As shown, the multi-seal structure can be configured with a single boss and a single groove, or multiple bosses can be set along the axial direction of the lower valve seat cavity, and correspondingly multiple grooves can be set on the gate plate. A stronger seal can be achieved through the cooperation of multiple bosses and multiple grooves.
[0044] Example 2
[0045] This embodiment will determine the optimal shape parameters of the trapezoidal boss based on fluid mechanics and CJD simulation.
[0046] Foreign object resistance is caused by the tangential stress and pressure difference resulting from the flow of fluid around an object. Therefore, resistance includes two types: frictional resistance and pressure difference resistance. Frictional resistance refers to the direct result of the tangential stress acting on the valve surface and the material of the valve surface. Pressure difference resistance refers to the pressure difference caused by different impact forces acting on the foreign object in the fluid. The sum of frictional resistance and pressure difference resistance is the foreign object resistance.
[0047] In this invention, the foreign object resistance is reflected by the foreign object resistance coefficient. The smaller the foreign object resistance coefficient, the smaller the impact on the accumulation of foreign objects inside the gate valve.
[0048] The foreign object drag coefficient is determined by the following formula:
[0049]
[0050] S is the lateral area of the boss facing the foreign object side; θ is the angle at which the side of the trapezoidal boss facing the fluid impact is inclined in the direction of fluid flow. According to the direction of fluid flow, θ = θ1, θ = θ2; δ is the area ratio coefficient, because the foreign object does not move at all positions on the side surface of the boss, so it needs to be multiplied by δ; μ is the friction coefficient, which is related to the material of the valve seat.
[0051] like Figure 9As shown, this is a schematic diagram of the boss and fluid parameters. When the gate falls to a height h2 from the lower surface of the lower valve seat, the fluid flow velocity in the space between the gate and the upper surface of the boss is V2, and the pressure on the foreign object in this space is P2. When the gate falls to a height h1 from the lower surface of the lower valve seat, the impact velocity of the fluid in the space between the gate and the lower surface of the lower valve seat is V1, and the pressure on the foreign object in this space is P1.
[0052] P2 and P1 satisfy the following formula:
[0053]
[0054] Where ρ is the fluid density, and the weight of the foreign object itself is ignored.
[0055] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A gate valve of the strong seal type, characterized in that: The valve seat, the gate and the driving rod control the opening and closing degree of the gate; The valve seat comprises a lower valve seat and an upper valve seat; the lower valve seat has a lower valve seat cavity inside, which is a fluid passing cavity; the upper valve seat has an upper valve seat cavity inside, which is a return space when the gate is opened; The inner wall of the lower valve seat cavity is provided with a radial boss in the direction perpendicular to the inner wall surface, and the outer peripheral surface of the gate is embedded with a continuous groove; the radial boss and the continuous groove are matched and sealed with each other to form a clamping element; When the gate is completely closed, the outer peripheral surface of the gate and the inner wall of the lower valve seat cavity are mechanically matched and sealed through the clamping element; The thickness of the boss gradually decreases in the direction away from the inner wall of the lower valve seat cavity, and the top surface of the boss and the two side surfaces form obtuse angles, which are angle θ1 and angle θ2 respectively; the angles θ1 and θ2 are adjusted according to the flow direction of the fluid and the type of the fluid.
2. The high sealing gate valve according to claim 1, characterized in that, The groove has an inner side wall and a bottom wall, and the surfaces of the inner side wall and the bottom wall form a sealing surface; when the groove of the gate is completely clamped with the boss of the lower valve seat cavity, the sealing surface formed by the inner side wall and the top wall of the groove is extruded and rubbed with the top surface and the side surface of the boss, thereby forming a multi-seal structure.
3. The high sealing gate valve according to claim 2, wherein The top surface of the boss is chamfered at the connection with the two side surfaces.
4. The high sealing gate valve according to claim 1, wherein The inner wall of the lower valve seat cavity and the boss are formed by integral machining.
5. The high sealing gate valve according to claim 2, wherein The body of the gate is made of elastic sealing material, and the sealing surface is directly machined on the groove.
6. The high sealing gate valve according to claim 2, wherein The sealing surface is formed by coating a sealing material on the surfaces of the inner side wall and the bottom wall of the groove.
7. The high sealing gate valve according to claim 1, wherein The boss is provided with two or more than two in the axial direction of the valve body, and the groove is provided with two or more than two in the axial direction of the gate.
8. The high sealing gate valve according to claim 1, wherein The gate has left and right two side surfaces and a bottom surface, and the ear part protrudes outward in the axial direction of the upper half circle outer periphery of the gate; the grooves embedded in the ear part and the left and right two side surfaces cooperate with the upper valve seat clamping element, so that the gate can be retracted and extended in the upper valve seat cavity; when the gate is about to be closed, the groove embedded in the bottom surface of the gate is clamped with the boss of the lower valve seat cavity, and continues to move downward until the complete clamping state.