High sealing spherical emergency shut-off valve for industrial fluids

Abstract

This invention discloses a high-sealing spherical emergency shut-off valve for industrial fluids, comprising a right-angle linkage drive device, a valve sleeve vertically arranged below the right-angle linkage drive device, and a valve body horizontally arranged below the valve sleeve; an upper valve stem is coaxially arranged inside the valve sleeve, the upper end of the upper valve stem is connected to the output end of the right-angle linkage drive device, and a support block is fixedly arranged at the lower end of the upper valve stem; an elastic ball is arranged in the middle position inside the valve body, and a four-bar linkage is arranged between the upper end of the elastic ball and the support block, and the support block is connected to the elastic ball through the four-bar linkage; valve seats that seal with the valve body are symmetrically arranged on both sides of the elastic ball; this invention adopts an electromagnetically driven valve seat separation mechanism, which completely solves the problem of sealing surface wear during the opening and closing process, allowing the valve to achieve ultra-fast opening and closing, and at the same time, the high-speed fluid generated by the gap flushes the surface of the ball, which has a self-cleaning function and prevents the accumulation of particulate matter.

Description

Technical Field

[0001] This invention belongs to the field of pipeline fluid control technology, specifically a high-sealing spherical emergency shut-off valve for industrial fluids. Background Technology

[0002] High-sealing emergency shut-off valves for fluid applications are critical safety devices in industrial piping systems, used to quickly and strictly cut off the flow of media in hazardous conditions or when triggered by emergency signals. As the core actuator of a safety instrumented system, their function is to prevent accidents from escalating and to ensure the safety of personnel, equipment, and the environment.

[0003] Existing high-sealing emergency shut-off valves for fluids typically rely on direct solid contact between the valve core and the valve seat, along with the application of mechanical clamping force, to achieve sealing. During opening and closing, the sealing surface is constantly under pressure or sliding friction, which easily leads to wear, jamming, increased torque, and particulate contamination due to friction. CN202122717876.6 discloses a lifting rod dustproof ball valve, which achieves frictionless contact between the ball and the valve seat during opening and closing through the telescopic movement of an irregularly shaped ball, thus solving the problems of wear, jamming, and leakage of the sealing surface in traditional ball valves. However, this patent only applies to the on / off control of conventional ball valves and does not cover emergency shut-off functions. When used as a high-sealing emergency shut-off valve for fluids, this valve has the following shortcomings: Firstly, it relies solely on the contact between the irregularly shaped ball and the valve seat for sealing, without a multi-stage sealing structure. Under high pressure, corrosive fluids, or long-term operating conditions, the sealing surface is prone to aging and wear, making it difficult to achieve zero leakage requirements. Secondly, it lacks a rapid drive and emergency shut-off structure, making it impossible to achieve millisecond-level shut-off in the event of a sudden failure.

[0004] Therefore, it is necessary to provide a high-sealing spherical emergency shut-off valve for industrial fluids to solve the problems mentioned in the background art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-sealing spherical emergency shut-off valve for industrial fluids, comprising a right-angle linkage drive device, a handwheel being provided on one side of the right-angle linkage drive device; a valve sleeve being vertically arranged below the right-angle linkage drive device, and a valve body being horizontally arranged below the valve sleeve; the upper end of the valve sleeve being connected to the lower end of the right-angle linkage drive device, and the lower end of the valve sleeve being connected to the upper end of the valve body; An upper valve stem is coaxially arranged inside the valve sleeve. The upper end of the upper valve stem is connected to the output end of the right-angle linkage drive device, and a support block is fixedly arranged at the lower end of the upper valve stem. An elastic ball is disposed in the middle of the valve body. A four-bar linkage is disposed between the upper end of the elastic ball and the support block, and the support block is connected to the elastic ball through the four-bar linkage. A lower valve stem is vertically fixed in the valve body below the elastic ball, and the upper end of the lower valve stem is rotatably connected to the lower end of the elastic ball. Valve seats that are sealed and fitted to the valve body are symmetrically disposed on both sides of the elastic ball.

[0006] Furthermore, as a preferred embodiment, the right-angle linkage drive device is internally equipped with an independent angular stroke actuator and a motion conversion mechanism; the angular stroke actuator includes a motor, a reduction mechanism, a control unit, and a position feedback device; the motion conversion mechanism adopts a gear and rack mechanism.

[0007] Furthermore, as a preferred embodiment, an inverted L-shaped slot is provided in the middle of the valve sleeve.

[0008] Furthermore, as a preferred embodiment, a boss is vertically fixed at the middle position of the upper valve stem, and the end of the boss is slidably connected in the inverted L-shaped slot.

[0009] Furthermore, as a preferred embodiment, the elastic sphere has a through-flow fluid channel inside, and the inner wall of the fluid channel has guide patterns; the upper end of the elastic sphere has a vertically opened wedge-shaped notch, and the two sides of the wedge-shaped notch are symmetrically milled with limiting grooves; the wedge-shaped notch is slidably connected to the support block, and both sides of the support block are provided with limiting blocks adapted to the limiting grooves.

[0010] Furthermore, as a preferred embodiment, sealing rings are symmetrically arranged on both sides of the elastic sphere, and the sealing surfaces of the sealing rings are coated with a tungsten carbide coating.

[0011] Furthermore, as a preferred embodiment, the valve seat includes a main sealing valve seat, which is coaxially fixed inside the valve body, and an electromagnet assembly is provided at the bottom of the main sealing valve seat; a secondary sealing valve seat is slidably disposed coaxially inside the main sealing valve seat, and a self-sealing ring is provided between the outer circumference of the secondary sealing valve seat and the main sealing valve seat; a set of compression springs is provided between the bottom of the secondary sealing valve seat and the main sealing valve seat, and the two ends of the compression springs are fixedly connected to the main sealing valve seat and the secondary sealing valve seat respectively.

[0012] Furthermore, as a preferred embodiment, the contact surface between the secondary sealing valve seat and the sealing ring is a non-uniform radius curved surface, wherein the radius of curvature of the contact surface in the low-pressure region is smaller than its radius of curvature in the high-pressure region, and the radius of curvature in the high-pressure region is adapted to the sealing surface of the sealing ring.

[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention employs an electromagnetically driven valve seat separation mechanism. Under normal operating conditions, the electromagnet assembly is energized, separating the valve seat from the elastic ball to achieve "zero-friction" opening and closing, significantly reducing operating torque. In emergency shut-off, the electromagnet assembly is de-energized, and the valve seat, under the action of spring force and medium pressure, tightly adheres to the elastic ball, achieving a reliable seal. This device completely solves the problem of sealing surface wear during opening and closing, allowing the valve to achieve ultra-fast opening and closing. Simultaneously, the high-speed fluid generated by the gap flushes the ball surface, providing a self-cleaning function and preventing the accumulation of particulate matter.

[0014] This invention employs a right-angle linkage drive device and an inverted L-shaped slot. The right-angle linkage drive device replaces the original simple handwheel drive, realizing dual drive for both manual and emergency automatic operation. Through a motion conversion mechanism, the angular stroke actuator (rotational motion) can drive the upper valve stem to move along the inverted L-shaped slot to achieve a sequential compound action of "rotation first, then linear motion" or "linear motion first, then rotation," thus combining the two motion modes. This design effectively shortens the valve opening and closing stroke and time, while filling the market gap where electric valves cannot be used as emergency shut-off valves.

[0015] This invention employs an elastic sphere, which has both opening and closing functions. The opening or closing action of the elastic sphere is accomplished by a combination of components such as a four-bar linkage, a support block, and a lower valve stem. This solves a series of problems in existing high-sealing emergency shut-off valves for fluid applications, such as wear and sticking of seals, high torque, and particulate matter contamination caused by friction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the valve body in this invention; Figure 3 This is a schematic diagram of the valve seat structure in this invention; Figure 4 This is a schematic diagram of the structure of the elastic sphere in this invention; Figure 5 This is a schematic diagram illustrating different working states of the present invention; In the diagram: 1. Right-angle linkage drive device; 11. Handwheel; 2. Valve sleeve; 21. Inverted L-shaped groove; 3. Valve body; 4. Upper valve stem; 41. Boss; 5. Support block; 51. Limiting block; 6. Elastic ball; 61. Fluid passage; 62. Wedge notch; 621. Limiting groove; 63. Sealing ring; 7. Four-link rod; 8. Lower valve stem; 9. Valve seat; 91. Main sealing valve seat; 92. Secondary sealing valve seat; 93. Self-sealing ring; 94. Compression spring; 95. Contact surface. Detailed Implementation

[0017] Please see Figures 1-5In this embodiment of the invention, a high-sealing spherical emergency shut-off valve for industrial fluids includes a right-angle linkage drive device 1. A handwheel 11 is provided on one side of the right-angle linkage drive device 1. The handwheel 11 is used for manual emergency shut-off in case of power failure. The right-angle linkage drive device replaces the original simple handwheel 11 drive, realizing dual drive of manual and emergency automatic. A valve sleeve 2 is vertically arranged below the right-angle linkage drive device 1, and a valve body 3 is horizontally arranged below the valve sleeve 2. The upper end of the valve sleeve 2 is connected to the lower end of the right-angle linkage drive device 1, and the lower end of the valve sleeve 2 is connected to the upper end of the valve body 3. The valve sleeve 2 is coaxially provided with an upper valve stem 4. The upper end of the upper valve stem 4 is connected to the output end of the right-angle linkage drive device 1, and the lower end of the upper valve stem 4 is fixedly provided with a support block 5. An elastic ball 6 is provided in the middle of the valve body 3. A four-link rod 7 is provided between the upper end of the elastic ball 6 and the support block 5, and the support block 5 is connected to the elastic ball 6 through the four-link rod 7. A lower valve stem 8 is vertically fixed below the elastic ball 6 inside the valve body 3. The upper end of the lower valve stem 8 is rotatably connected to the lower end of the elastic ball 6. Valve seats 9 that are sealed and fitted to the valve body 3 are symmetrically arranged on both sides of the elastic ball 6.

[0018] In this embodiment, the right-angle linkage drive device 1 is equipped with an independent angular stroke actuator (not shown in the figure) and a motion conversion mechanism (not shown in the figure); the angular stroke actuator includes a motor (not shown in the figure), a reduction mechanism (not shown in the figure), a control unit (not shown in the figure), and a position feedback device (not shown in the figure); the motion conversion mechanism adopts a gear and rack mechanism (not shown in the figure).

[0019] The angular stroke actuator is the power source of the entire drive unit, generating rotational torque; the motion conversion mechanism is the key module for realizing the conversion of "rotational" to "linear" motion.

[0020] Electric motor: Provides raw power; Speed ​​reduction mechanism: used to reduce speed and increase output torque; Control unit: including stroke control mechanism, torque limiting mechanism, etc., used to precisely control valve position and provide overload protection; Position feedback device: used to feed back the valve position signal to the control system.

[0021] The output shaft of the angular stroke actuator is connected to a precision gear, and a rack is machined on the upper valve stem 4 to mesh perpendicularly with it. When the angular stroke actuator drives the gear to rotate, the rack will drive the upper valve stem 4 to make precise linear motion. This design is compact, has high transmission efficiency, and is accurate in positioning.

[0022] In a preferred embodiment, an inverted L-shaped slot 21 is provided in the middle of the valve sleeve 2. The inverted L-shaped slot 21 realizes the sequential compound action of "rotation first and then straight line" or "straight line first and then rotation".

[0023] In this embodiment, a boss 41 is vertically fixed at the middle position of the upper valve stem 4, and the end of the boss 41 is slidably connected in the inverted L-shaped slot 21.

[0024] When the action begins: the angular stroke actuator rotates, and the boss 41 moves in the horizontal section of the inverted L-shaped slot 21. At this time, the upper valve stem 4 first performs a 90-degree rotation. The action continues: when the boss 41 moves to the vertical section of the inverted L-shaped slot 21, the rotation stops and the upper valve stem 4 begins to perform a linear descent, completing the valve closure and achieving a reliable seal; When the action is reversed: the process is reversed, the upper valve stem 4 first performs a linear upward movement, and then rotates after reaching the position to complete the opening of the valve.

[0025] This design effectively shortens the valve's opening and closing stroke and time.

[0026] In this embodiment, the elastic sphere 6 has a through fluid channel 61 inside, and the inner wall of the fluid channel 61 is provided with flow guide patterns (not shown in the figure). The flow guide patterns can reduce fluid impact and prevent particulate media from being trapped. The upper end of the elastic sphere 6 has a vertically opened wedge-shaped notch 62, and the two sides of the wedge-shaped notch 62 are symmetrically milled with limiting grooves 621. The wedge-shaped notch 62 is slidably connected to the support block 5, and the two sides of the support block 5 are provided with limiting blocks 51 that are adapted to the limiting grooves 621.

[0027] The elastic ball 6 has the function of opening and closing. The opening or closing action of the elastic ball 6 is completed by the four-link 7, the support block 5, the lower valve rod 8 and other components.

[0028] Sealing state: When the angular stroke actuator rotates, the boss 41 moves in the horizontal section of the inverted L-shaped slot 21. At this time, the upper valve stem 4 first performs a 90-degree rotation, and the upper valve stem 4 drives the elastic ball 6 to rotate synchronously. When the boss 41 moves to the vertical section of the inverted L-shaped slot 21, the rotation stops, and the upper valve stem 4 begins to perform a linear descent. The upper valve stem 4 drives the support block 5 to descend synchronously, opening the elastic ball 6 and completing the valve closure, thus achieving a reliable seal.

[0029] Open state: The process is reversed. The upper valve stem 4 first performs a linear upward movement, which drives the support block 5 to rise synchronously, and the elastic ball 6 closes. After the upper valve stem 4 reaches its position, it rotates to complete the opening of the valve.

[0030] Zero friction effect: The elastic ball 6 and valve seat 9 rotate without friction throughout the entire valve opening and closing process, which solves a series of problems caused by friction in existing high-sealing emergency shut-off valves for fluids, such as wear of seals, jamming, large torque, and particulate matter contamination.

[0031] In this embodiment, sealing rings 63 are symmetrically arranged on both sides of the elastic ball 6. The sealing surface of the sealing rings 63 is coated with a tungsten carbide coating, which can improve the wear resistance and corrosion resistance of the sealing rings 63.

[0032] In a preferred embodiment, the valve seat 9 includes a main sealing valve seat 91, which is coaxially fixed inside the valve body 3, and an electromagnet assembly (not shown in the figure) is provided at the bottom of the main sealing valve seat 91; a secondary sealing valve seat 92 is slidably disposed coaxially inside the main sealing valve seat 91, and a self-sealing ring 93 is provided between the outer circumference of the secondary sealing valve seat 92 and the main sealing valve seat 91; a set of compression springs 94 is provided between the bottom of the secondary sealing valve seat 92 and the main sealing valve seat 91, and the two ends of the compression springs 94 are fixedly connected to the main sealing valve seat 91 and the secondary sealing valve seat 92 respectively.

[0033] Under normal operating conditions, the electromagnet assembly generates magnetic force when energized, attracting the secondary sealing valve seat 92 to move towards the main sealing valve seat 91 against the preload of the compression spring 94. This causes the secondary sealing valve seat 92 to disengage from the sealing surface of the sealing ring 63 on the elastic ball 6 and form a gap, thereby achieving "zero friction" opening and closing and significantly reducing the operating torque.

[0034] In case of emergency shut-off, the electromagnet assembly loses power, and the secondary sealing valve seat 92, under the action of spring force and medium pressure, tightly adheres to the sealing surface of the sealing ring 63, achieving a reliable seal.

[0035] This structure completely solves the problem of sealing surface wear during opening and closing, and allows the valve to open and close ultra-fast. At the same time, the gap formed under normal operating conditions allows high-speed fluid to flush the surface of the ball, thus providing a self-cleaning function and preventing the accumulation of particulate matter.

[0036] In this embodiment, the contact surface 95 between the secondary sealing valve seat 92 and the sealing ring 63 is a non-uniform radius curved surface. The radius of curvature of the contact surface 95 in the low-pressure area is smaller than its radius of curvature in the high-pressure area, which increases the sealing specific pressure. The radius of curvature in the high-pressure area is adapted to the sealing surface of the sealing ring 63, which expands the contact area.

[0037] By optimizing the structure of the contact surface 95, the sealing pressure distribution is made more uniform, thereby mitigating the "edge effect" present in traditional ball valve sealing surfaces. As a result, the leakage characteristic value of the sealing structure is reduced by at least 30% compared to the traditional structure, effectively improving sealing reliability.

[0038] Specifically, the first stage: receiving commands and outputting power. In an automation system, the central control room or field controller sends a control signal to the rotary actuator. The control unit inside the rotary actuator receives this signal and compares it with the actual position of the valve. If a deviation exists, the control unit starts the motor. The motor, through its internal reduction mechanism, converts high speed and low torque into low speed and high torque rotational force, ultimately outputting a powerful rotational torque from the output shaft.

[0039] Second stage: Motion transformation (rotation → linear) The output shaft of the angular stroke actuator is connected to a precision gear, and a rack is machined on the upper valve stem 4 to mesh perpendicularly with it; when the angular stroke actuator drives the gear to rotate, the rack will drive the upper valve stem 4 to make precise linear motion.

[0040] Third stage: Inverted L-shaped slot 21 realizes valve state switching. Sealing state: When the angular stroke actuator rotates, the boss 41 moves in the horizontal section of the inverted L-shaped slot 21. At this time, the upper valve stem 4 first performs a 90-degree rotation, and the upper valve stem 4 drives the elastic ball 6 to rotate synchronously. When the boss 41 moves to the vertical section of the inverted L-shaped slot 21, the rotation stops, and the upper valve stem 4 begins to perform a linear descent. The upper valve stem 4 drives the support block 5 to descend synchronously, opening the elastic ball 6 and completing the valve closure, thus achieving a reliable seal.

[0041] At the same time, the electromagnet assembly is de-energized, and the secondary sealing valve seat 92, under the action of spring force and medium pressure, tightly adheres to the sealing surface of the sealing ring 63, achieving a reliable seal.

[0042] Open state: The process is reversed. The upper valve stem 4 first performs a linear upward movement, which drives the support block 5 to rise synchronously, and the elastic ball 6 closes. After the upper valve stem 4 reaches its position, it rotates to complete the opening of the valve.

[0043] At the same time, the electromagnet assembly generates magnetic force when energized, attracting the secondary sealing valve seat 92 to move towards the main sealing valve seat 91 against the preload of the compression spring 94. This causes the secondary sealing valve seat 92 to disengage from the sealing surface of the sealing ring 63 on the elastic ball 6 and form a gap, thereby achieving "zero friction" opening and closing and significantly reducing the operating torque.

[0044] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-sealing spherical emergency shut-off valve for industrial fluids, characterized in that: It includes a right-angle linkage drive device (1), a handwheel (11) is provided on one side of the right-angle linkage drive device (1); a valve sleeve (2) is vertically provided below the right-angle linkage drive device (1), and a valve body (3) is horizontally provided below the valve sleeve (2); the upper end of the valve sleeve (2) is connected to the lower end of the right-angle linkage drive device (1), and the lower end of the valve sleeve (2) is connected to the upper end of the valve body (3); The valve sleeve (2) is coaxially provided with an upper valve stem (4), the upper end of which is connected to the output end of the right-angle linkage drive device (1), and a support block (5) is fixedly provided at the lower end of the upper valve stem (4). An elastic ball (6) is provided in the middle of the valve body (3). A four-link rod (7) is provided between the upper end of the elastic ball (6) and the support block (5). The support block (5) is connected to the elastic ball (6) through the four-link rod (7). A lower valve rod (8) is vertically fixed in the valve body (3) below the elastic ball (6). The upper end of the lower valve rod (8) is rotatably connected to the lower end of the elastic ball (6). Valve seats (9) that seal with the valve body (3) are symmetrically arranged on both sides of the elastic ball (6).

2. The high-sealing spherical emergency shut-off valve for industrial fluids according to claim 1, characterized in that: The right-angle linkage drive device (1) is equipped with an independent angular stroke actuator and motion conversion mechanism; the angular stroke actuator includes a motor, a reduction mechanism, a control unit and a position feedback device; the motion conversion mechanism adopts a gear and rack mechanism.

3. The high-sealing spherical emergency shut-off valve for industrial fluids according to claim 1, characterized in that: The valve sleeve (2) has an inverted L-shaped slot (21) in the middle position.

4. The high-sealing spherical emergency shut-off valve for industrial fluids according to claim 1, characterized in that: The upper valve stem (4) is vertically fixed with a boss (41) at the middle position, and the end of the boss (41) is slidably connected in the inverted L-shaped slot (21).

5. A high-sealing spherical emergency shut-off valve for industrial fluids according to claim 1, characterized in that: The elastic sphere (6) has a through fluid channel (61) inside, and the inner wall of the fluid channel (61) is provided with flow guide patterns; the upper end of the elastic sphere (6) is vertically provided with a wedge-shaped notch (62), and the two sides of the wedge-shaped notch (62) are symmetrically milled with limiting grooves (621); the wedge-shaped notch (62) is slidably connected to the support block (5), and the two sides of the support block (5) are provided with limiting blocks (51) that are adapted to the limiting grooves (621).

6. A high-sealing spherical emergency shut-off valve for industrial fluids according to claim 3, characterized in that: The elastic sphere (6) is symmetrically provided with sealing rings (63) on both sides, and the sealing surface of the sealing rings (63) is coated with tungsten carbide coating.

7. A high-sealing spherical emergency shut-off valve for industrial fluids according to claim 1, characterized in that: The valve seat (9) includes a main sealing valve seat (91), which is coaxially fixed inside the valve body (3), and an electromagnet assembly is provided at the bottom of the main sealing valve seat (91); a secondary sealing valve seat (92) is coaxially slidably provided inside the main sealing valve seat (91), and a self-sealing ring (93) is provided between the outer circumference of the secondary sealing valve seat (92) and the main sealing valve seat (91); a set of compression springs (94) is provided between the bottom of the secondary sealing valve seat (92) and the main sealing valve seat (91), and the two ends of the compression springs (94) are fixedly connected to the main sealing valve seat (91) and the secondary sealing valve seat (92) respectively.

8. A high-sealing spherical emergency shut-off valve for industrial fluids according to claim 6, characterized in that: The contact surface (95) between the secondary sealing valve seat (92) and the sealing ring (63) is a non-uniform radius curved surface. The radius of curvature of the contact surface (95) in the low-pressure area is smaller than its radius of curvature in the high-pressure area, and the radius of curvature in the high-pressure area is adapted to the sealing surface of the sealing ring (63).

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