Leakless magnetic ball valve

Abstract

A leak-free magnetic ball valve includes a main valve body, a ball and a valve seat disposed inside the main valve body. A valve stem is fixedly connected to the upper end of the ball. A connecting plate is mounted on the upper surface of the main valve body, and a connecting frame is mounted on the connecting plate. A driving device is mounted on the top of the connecting frame, and the output end of the driving device extends downward into the connecting frame and is fixedly connected to an external magnetic drive. The external magnetic drive is a hollow cavity structure with an open bottom. An isolation sleeve is provided inside the hollow cavity of the external magnetic drive, and the lower end of the isolation sleeve is fixed to the connecting plate. An internal magnetic drive is fixedly installed on the upper end of the valve stem and is housed inside the isolation sleeve. The internal magnetic drive and the external magnetic drive are magnetically coupled. This invention overcomes the shortcomings of the prior art by using a fixed isolation sleeve to completely physically isolate the internal and external magnetic drives and form a static seal between its lower end and the connecting plate, successfully confining all media inside the valve body. This solves the risk of media leakage caused by packing wear and aging in traditional valves.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a leak-free magnetic ball valve. Background Technology

[0002] As a key control component in fluid transport systems, valves primarily function to cut off, regulate, and guide the flow of media. The reliability of their sealing performance directly affects the safety, environmental protection, and operational efficiency of the entire system. Ball valves are widely used due to their advantages such as low flow resistance, rapid opening and closing, and relatively compact structure.

[0003] Currently, most mainstream ball valves on the market employ a stuffing box seal structure for their stem dynamic seals. This structure achieves a dynamic seal by filling the valve stem with flexible sealing materials such as graphite or PTFE and applying axial preload using a packing gland, ensuring a tight fit between the packing and the outer surface of the valve stem. While this technology is mature and cost-effective, the valve stem rotates during opening and closing, creating relative movement between it and the packing. Over time, this inevitably leads to packing wear, aging, and plastic deformation, weakening the preload, reducing sealing performance, and ultimately causing external leakage. Such leakage poses a significant safety and environmental hazard in applications involving flammable, explosive, toxic, or radioactive media. Furthermore, when the medium contains solid particles or is highly corrosive, it accelerates the wear and corrosion of the packing and valve stem, further shortening the seal life and potentially causing valve stem jamming. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a leak-free magnetic ball valve that overcomes these deficiencies. Its rational design utilizes a fixed isolation sleeve to completely physically isolate the inner and outer magnetic drives, forming a static seal between the sleeve's lower end and the connecting disc, successfully confining all media within the valve body. This eliminates the risk of media leakage caused by packing wear and aging in traditional valves.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A leak-free magnetic ball valve includes a main valve body, a ball disposed inside the main valve body, and a valve seat. The ball and the valve seat form a sealing fit. A valve stem is fixedly connected to the upper end of the ball. A connecting plate is fixedly installed on the upper surface of the main valve body. A connecting frame is fixedly installed on the upper surface of the connecting plate. A driving device is fixedly installed on the top of the connecting frame. The output end of the driving device extends downward into the interior of the connecting frame and is fixedly connected to an external magnetic drive. The external magnetic drive is a hollow cavity structure with an open bottom. An isolation sleeve is disposed inside the hollow cavity of the external magnetic drive. The lower end of the isolation sleeve is fixedly connected to the connecting plate. An internal magnetic drive is fixedly installed at the upper end of the valve stem through the connecting plate. The internal magnetic drive is housed inside the isolation sleeve. The internal magnetic drive and the external magnetic drive form a non-contact transmission pair through magnetic coupling.

[0007] Preferably, the upper end of the isolation sleeve is coaxially provided with an upwardly protruding annular boss, and the outer peripheral wall of the annular boss is rotatably connected to the inner wall of the hollow cavity of the external magnetic drive through a first bearing.

[0008] Preferably, the hollow cavity of the external magnetic drive has an annular step on its inner wall, a limiting groove is formed above the outer circumferential surface of the annular boss, a limiting ring is installed in the limiting groove, the limiting ring abuts against the upper surface of the inner ring of the first bearing, and the annular step abuts against the upper surface of the outer ring of the first bearing.

[0009] Preferably, the outer peripheral wall of the inner magnetic drive is rotatably connected to the inner wall of the isolation sleeve via a second bearing.

[0010] Preferably, the driving device is a manual actuator, an electric actuator, or a pneumatic actuator.

[0011] Preferably, sealing gaskets are provided between the connecting disc and the main valve body, and between the connecting disc and the isolation sleeve.

[0012] This invention provides a leak-free magnetic ball valve with the following advantages: By employing a fixed isolation sleeve to completely physically isolate the inner and outer magnetic drives, and forming a static seal between its lower end and the connecting disc, all media are successfully confined inside the valve body. Compared to traditional valves that rely on dynamic sealing between packing and valve stem, this invention fundamentally eliminates the risk of media leakage caused by packing wear and aging. This is a crucial safety guarantee for pipeline systems transporting highly hazardous media such as flammable, explosive, toxic, or radioactive materials, effectively preventing safety accidents and environmental pollution. Furthermore, because the drive device is completely isolated from the media flow channel in the valve body, users can flexibly select different types of actuators, such as manual, electric, or pneumatic, as the drive device according to actual working conditions, without worrying about media corrosion or contamination of the actuator. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this utility model or the prior art, the accompanying drawings used in the description of this utility model or the prior art will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0016] Explanation of the labels in the diagram:

[0017] 1. Main valve body; 2. Ball; 3. Valve seat; 4. Valve stem; 5. Connecting plate; 6. Connecting frame; 7. Drive unit; 8. External magnetic drive; 9. Isolation sleeve; 10. Internal magnetic drive; 11. Annular boss; 12. First bearing; 13. Second bearing; 14. Sealing gasket; 15. Limiting ring. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0019] Example 1, as Figure 1-2 As shown, a leak-free magnetic ball valve includes a main valve body 1, a ball 2 and a valve seat 3 disposed inside the main valve body 1. The ball 2 and the valve seat 3 form a sealing fit. A valve stem 4 is fixedly connected to the upper end of the ball 2. A connecting plate 5 is fixedly installed on the upper end face of the main valve body 1. A connecting frame 6 is fixedly installed on the upper surface of the connecting plate 5. A driving device 7 is fixedly installed on the top of the connecting frame 6. The output end of the driving device 7 extends downward into the interior of the connecting frame 6 and is fixedly connected to an external magnetic drive 8. The external magnetic drive 8 is a hollow cavity structure with an open bottom. An isolation sleeve 9 is disposed in the hollow cavity of the external magnetic drive 8. The lower end of the isolation sleeve 9 is fixedly connected to the connecting plate 5. An internal magnetic drive 10 is fixedly installed through the connecting plate 5 at the upper end of the valve stem 4. The internal magnetic drive 10 is housed inside the isolation sleeve 9. The internal magnetic drive 10 and the external magnetic drive 8 form a non-contact transmission pair through magnetic coupling.

[0020] Working principle:

[0021] When the valve needs to be opened or closed, the drive device 7 is activated or operated. The output shaft of the drive device 7 drives the outer magnetic drive 8 to rotate synchronously. In this embodiment, the outer magnetic drive 8 is composed of permanent magnet materials arranged in a specific polarity. When it rotates, the resulting rotating magnetic field penetrates the wall thickness of the isolation sleeve 9 and acts on the inner magnetic drive 10 enclosed by the isolation sleeve 9. Due to the coupling effect of the magnetic field (i.e., "magnetic torque"), the inner magnetic drive 10 will precisely follow the outer magnetic drive 8 in synchronous rotation. This process realizes the "non-contact" transmission of torque from the outside to the inside of the valve, forming the basis for leak-free transmission. The inner magnetic drive 10 is fixedly connected to the upper end of the valve stem 4 through the connection structure at its lower end. Therefore, when the inner magnetic drive 10 rotates, it directly drives the valve stem 4 to rotate together. The lower end of the valve stem 4 is fixedly connected to the ball 2, thereby transmitting torque to the ball 2, forcing the ball 2 to rotate approximately 90 degrees within the main valve body 1. When the flow channel axis of ball 2 is aligned with the pipeline axis, the valve is fully open, allowing the medium to flow. When ball 2 rotates to a position where its flow channel axis is perpendicular to the pipeline axis, its spherical surface tightly contacts the valve seat 3, forming a sealing pair, and the valve is closed, cutting off the medium. By controlling the rotation angle of the drive device 7, the opening and closing position of ball 2 can be precisely controlled, achieving fluid flow control.

[0022] In this embodiment, the isolation sleeve 9 is made of a non-magnetic high-strength material (such as austenitic stainless steel). Its lower end is statically sealed and fixed to the connecting disc 5, while its upper end extends into the cavity of the external magnetic drive 8. The isolation sleeve 9 acts as a robust barrier, completely and permanently isolating the medium flowing inside the valve from the external environment. The medium is sealed within the cavity formed by the main valve body 1, the ball 2, the valve seat 3, and the isolation sleeve 9. Regardless of how the valve stem 4 rotates, since the isolation sleeve 9 is fixed, there is no relative movement between it and the connecting disc 5, thus forming a reliable static seal, ensuring zero leakage of the medium and completely solving the leakage problem caused by packing seal wear in traditional valves. Simultaneously, the magnetic coupling transmission eliminates mechanical friction, avoiding additional wear on transmission components and improving system lifespan and reliability.

[0023] This invention completely physically isolates the inner magnetic drive 10 from the outer magnetic drive 8 using a fixed isolation sleeve 9, forming a static seal between its lower end and the connecting plate 5, successfully confining all media inside the valve body. Compared to traditional valves that rely on dynamic sealing between packing and valve stem, this invention fundamentally eliminates the risk of media leakage caused by packing wear and aging. This is a crucial safety guarantee for pipeline systems transporting highly hazardous media such as flammable, explosive, toxic, or radioactive materials, effectively preventing safety accidents and environmental pollution. Furthermore, since the drive device 7 is completely isolated from the valve body's media flow channel, users can flexibly select different types of actuators, such as manual, electric, or pneumatic, as the drive device 7 according to actual working conditions without worrying about media corrosion or contamination of the actuator. Simultaneously, the valve's key sealing components (such as the isolation sleeve) can be made of materials with excellent corrosion resistance, enabling this invention to easily cope with harsh conditions such as strong corrosion and high salt spray, covering multiple fields including petrochemicals, chemical industry, nuclear power, pharmaceuticals, and marine engineering.

[0024] In Embodiment Two, as a further preferred embodiment of Embodiment One, the upper end of the isolation sleeve 9 is coaxially provided with an upwardly protruding annular boss 11. The outer peripheral wall of the annular boss 11 is rotatably connected to the inner wall of the hollow cavity of the outer magnetic drive 6 via a first bearing 12. By placing the first bearing 12 between the fixed isolation sleeve 9 and the rotating outer magnetic drive 8, a precise radial support point is provided for the outer magnetic drive 8. This effectively constrains the radial runout and oscillation that may occur when the outer magnetic drive 8 rotates at high speed. This ensures that the outer magnetic drive 8 and the internal inner magnetic drive 10 always maintain a very high degree of coaxiality. The improved coaxiality directly means that the coupling of magnetic lines of force is most effective, the transmission efficiency of magnetic torque is maximized, and the additional magnetic resistance and energy loss caused by misalignment are avoided. In addition, through the combined action of the annular boss 11 and the first bearing 12, a solid and unchanging geometric center is established for the rotation of the outer magnetic drive 8. This stable rotation center prevents the external magnetic drive 8 from deviating from its theoretical axis due to vibration or manufacturing tolerances during rotation, thus ensuring a safe and uniform gap between it and the internally fixed isolation sleeve 9 and the internal magnetic drive 10. This effectively eliminates the "scratching" phenomenon (i.e., the rotating part scraping against the stationary part) and ensures long-term maintenance-free and reliable operation of the equipment.

[0025] In Example 3, as a further preferred embodiment of Example 2, the hollow cavity of the external magnetic drive 6 has an annular step on its inner wall. A limiting groove is formed above the outer circumferential surface of the annular boss 11, and a limiting ring 15 is installed in the limiting groove. The limiting ring 15 abuts against the upper surface of the inner ring of the first bearing 12, and the annular step abuts against the upper surface of the outer ring of the first bearing 12. The annular step and the limiting ring 15 respectively limit the axial movement of the inner and outer rings of the first bearing 12, thereby completely eliminating the free movement space (i.e., axial runout) of the bearing in both axial directions. This ensures that when the external magnetic drive 8 is subjected to the axial reaction force or potential vibration during the start and stop of the drive device 7, its rotating part will not experience any axial displacement, thus ensuring the stability of the geometric dimensional chain of the entire magnetic drive system.

[0026] In Example 4, as a further preferred embodiment of Example 1, the outer peripheral wall of the inner magnetic drive 10 is rotatably connected to the inner wall of the isolation sleeve 9 via a second bearing 13. The second bearing 13 establishes a precise rotating pair between the inner magnetic drive 10 and the fixed isolation sleeve 9. This ensures that the entire internal transmission shaft system, composed of the inner magnetic drive 10 and the valve stem 4, maintains extremely high coaxiality during rotation, effectively preventing eccentric rotation that may be caused by machining or assembly tolerances. This also ensures uniform and efficient coupling of magnetic lines of force between the inner magnetic drive 10 and the outer magnetic drive 8, directly improving magnetic transmission efficiency.

[0027] In Example 5, as a further preferred embodiment of Example 1, the drive device 7 is a manual actuator, an electric actuator, or a pneumatic actuator. Specifically, the most economical drive solution can be selected based on initial investment, operating costs, and site conditions. For example, in situations with limited budgets or infrequent operation, a manual actuator can be used initially; when future automation upgrades are implemented, it can simply be replaced with an electric or pneumatic actuator without replacing the valve body. This achieves flexible switching of the valve drive method and seamless integration for future upgrades, significantly reducing maintenance and modification costs throughout the valve's lifecycle.

[0028] In Example 6, as a further preferred embodiment of Example 1, sealing gaskets 14 are provided between the connecting plate 10 and the main valve body 12, and between the connecting plate 10 and the isolation sleeve 4.

[0029] 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 the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A leak-free magnetic ball valve characterized by: The valve includes a main valve body (1), a ball (2) disposed inside the main valve body (1), and a valve seat (3). The ball (2) and the valve seat (3) form a sealing fit. A valve stem (4) is fixedly connected to the upper end of the ball (2). The valve is characterized in that a connecting plate (5) is fixedly installed on the upper end face of the main valve body (1), a connecting frame (6) is fixedly installed on the upper surface of the connecting plate (5), a driving device (7) is fixedly installed on the top of the connecting frame (6), and the output end of the driving device (7) extends downward to the connecting frame. (6) The external magnetic drive (8) is a hollow cavity structure with an open bottom. An isolation sleeve (9) is provided in the hollow cavity of the external magnetic drive (8). The lower end of the isolation sleeve (9) is fixedly connected to the connecting plate (5). The upper end of the valve stem (4) passes through the connecting plate (5) and is fixedly installed with an internal magnetic drive (10). The internal magnetic drive (10) is housed inside the isolation sleeve (9). The internal magnetic drive (10) and the external magnetic drive (8) are connected by magnetic coupling to form a non-contact transmission pair.

2. A leak-free magnetic ball valve according to claim 1, characterized in that: The upper end of the isolation sleeve (9) is coaxially provided with an upwardly protruding annular boss (11), and the outer peripheral wall of the annular boss (11) is rotatably connected to the inner wall of the hollow cavity of the external magnetic drive (8) through the first bearing (12).

3. A leak-free magnetic ball valve according to claim 2, characterized in that: The hollow cavity of the external magnetic drive (8) is provided with an annular step. A limiting groove is opened above the outer circumferential surface of the annular boss (11). A limiting ring (15) is installed in the limiting groove. The limiting ring (15) abuts against the upper surface of the inner ring of the first bearing (12). The annular step abuts against the upper surface of the outer ring of the first bearing (12).

4. A leak-free magnetic ball valve according to claim 1, characterized in that: The outer peripheral wall of the inner magnetic drive (10) is rotatably connected to the inner wall of the isolation sleeve (9) through the second bearing (13).

5. A leak-free magnetic ball valve according to claim 1, wherein: The drive device (7) is a manual actuator, an electric actuator, or a pneumatic actuator.

6. A leak-free magnetic ball valve according to claim 1, characterized in that: Sealing gaskets (14) are provided between the connecting plate (5) and the main valve body (1), and between the connecting plate (5) and the isolation sleeve (9).

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