Scraping decontamination type floating ball valve

Abstract

The invention discloses a scraping sewage disposal type floating ball valve, and relates to the technical field of valve sewage disposal, the scraping sewage disposal type floating ball valve comprises a valve body, a valve rod, an annular cavity, a water inlet valve seat, a water outlet valve seat, a ball body and an electric actuator, the inner wall of the valve body is fixedly connected with a sewage disposal mechanism, and the inner surface of the water outlet valve seat is provided with an annular embedded groove in advance; and a dirt cleaning scraping plate capable of stretching and retracting in the radial direction is arranged. The scraping plate is completely accommodated in the groove in a non-working state, is flush with the sealing surface of the valve seat, and does not interfere with normal sealing of the ball body; when the floating ball valve works, the floating ball valve can accurately stretch out and be tightly attached to the annular sealing belt of the valve seat, and the problems that due to the fact that impurities (such as scale and rust) in media are accumulated on the sealing belt where the ball body makes contact with the valve seat for a long time, sealing is not tight, and a precise sealing face is scratched when the floating ball valve is opened and closed are solved. Impurities are prevented from being attached to the sealing face of the water outlet valve seat for a long time, and therefore the problems of sealing failure and damage caused by sealing face pollution are prevented.

Description

Technical Field

[0001] This invention relates to the field of valve cleaning technology, specifically to a scraping-cleaning type floating ball valve. Background Technology

[0002] A floating ball valve is a widely used fluid control device. It rotates a central ball 90 degrees driven by the valve stem, opening and closing the flow path by aligning or blocking the ball's through-hole. In the closed state, the medium pressure pushes the ball to produce a slight displacement, causing it to press tightly against the downstream valve seat sealing surface, forming a reliable seal. Due to its simple structure, good sealing performance, and low flow resistance, it plays a crucial role in many industrial fields such as petroleum, chemical, and water supply.

[0003] However, when handling media containing impurities such as calcium and magnesium ions, silt, and rust, these impurities are easily compressed and remain on the contact sealing strip between the ball and the outlet valve seat under long-term use. This accumulation of impurities acts like a gasket, hindering direct contact between the ball and the valve seat's elastic sealing surface, leading to poor sealing and internal leakage. Furthermore, during valve opening and closing, hard particles can scratch the precision surface of the ball or the valve seat, causing permanent damage, significantly shortening the valve's lifespan, and affecting system safety.

[0004] Based on this, since the effective cleaning opportunity only exists during the valve opening and closing process, and in the brief moment when the ball and the outlet valve seat lose contact, this presents a severe challenge to the design of the cleaning mechanism. Traditional online cleaning solutions are often complex in structure. If a fixed cleaning component is set inside the valve cavity, it is easy to occupy the flow channel space for a long time, which may not only hinder the normal contact and sealing between the ball and the outlet valve seat, but may also further interfere with the core sealing function.

[0005] In summary, a scraping and cleaning type floating ball valve needs to be developed. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the technical solution adopted by this invention is: a scraping and cleaning type floating ball valve, comprising: a valve body, a valve stem, an annular cavity, an inlet valve seat, an outlet valve seat, a ball, and an electric actuator. A cleaning mechanism is fixedly connected to the inner wall of the valve body, and the cleaning mechanism further comprises: A scraping component is fixed to the inner wall of the annular cavity, and the scraping component includes an arc-shaped slide rail; A fitting component is fixedly connected to the inner wall of the annular cavity, and the fitting component includes a fixing frame; A triggering component is fixed to the outer surface of the valve stem, and the triggering component includes a fixing protrusion ring.

[0007] Furthermore, a slider is slidably connected to the outer surface of the arc-shaped slide rail, and a connecting strip is fixedly connected to the lower surface of the slider. A rotating sealing plate is fixedly connected to the end of the connecting strip away from the slider. The annular cavity serves as the integrated installation base for all cleaning function modules and ensures sealed isolation from the main channel of the valve body. The valve stem penetrates the valve body and achieves dynamic sealing through a packing seal. Its upper end is connected to an actuator to receive rotational torque, and its lower end forms a driving connection with a ball via a square tenon. The ball is placed at the center of the valve cavity and can generate a slight axial displacement under the action of medium pressure, thereby achieving tight contact with the outlet valve seat for sealing. The electric actuator is fixedly connected to the top support fixed to the valve body by bolts, forming a rigid whole that provides radial support. Simultaneously, the output shaft of the electric actuator is connected to the valve stem via a coupling, and the motor inside the actuator outputs torque to drive the valve stem to rotate.

[0008] Furthermore, an installation tube is fixedly connected to the inner surface of the rotating sealing plate, and a sliding rod is slidably connected to the inner surface of the installation tube. A cleaning scraper is fixedly connected to one end of the sliding rod. The cleaning scraper is made of polytetrafluoroethylene composite material and, when not in operation, is fully embedded in the pre-reserved groove on the inner surface of the outlet valve seat, remaining flush with the valve seat sealing surface and not affecting the sealing performance. When the valve stem rotates until the ball disengages from the outlet valve seat sealing position, the cleaning scraper is driven to extend radially through transmission components. Its back side forms a scraping angle with the outlet valve seat sealing surface, and it scrapes along the sealing strip with a certain contact pressure. This material combination effectively removes calcium and magnesium scale and other deposits in the water while ensuring minimal wear on the valve seat body.

[0009] Furthermore, the arc-shaped slide rail is disposed inside the annular cavity and is fixedly connected to the inner surface of the annular cavity. The outer surface of the rotating sealing plate is slidably connected to the inner surface of the annular cavity. The cleaning scraper is embedded in the inner surface of the outlet valve seat and is movably connected to the inner surface of the outlet valve seat. The arc-shaped slide rail is made of aluminum alloy and is fixed to a preset track on the inner wall of the annular cavity by screws, providing precise arc-shaped rotational guidance for the scraping motion. Both the slider and the arc-shaped slide rail are existing technologies. The connecting strip, as a rigid transmission element, converts the motion of the slider into the rotational motion of the rotating sealing plate. The rotating sealing plate is made of a composite material with an austenitic stainless steel matrix and an inlaid PTFE sealing layer. Its two outer surfaces maintain a precise dynamic fit with the inner wall of the annular cavity, achieving both rotational sealing and controlling frictional power consumption.

[0010] Furthermore, an electromagnet is fixedly attached to the inner surface of the fixing frame, and a sliding magnetic block is positioned directly below the electromagnet. A return spring is fixedly attached to the bottom of the sliding magnetic block, and a rigid pull rope is fixedly attached to the center of the bottom of the sliding magnetic block. The fixing frame serves as the mounting base for the electromagnetic component and is threadedly fastened to the non-moving area of ​​the annular cavity. When the electromagnet is energized, it generates a repulsive electromagnetic force with the sliding magnetic block. This repulsive force can overcome the preload of the return spring and drive the component to move. The sliding magnetic block is made of neodymium iron boron permanent magnet material.

[0011] Furthermore, a limiting tube is slidably connected to the outer surface of the rigid pull rope, and a compression spring is arranged around the outer side of the rigid pull rope near the slide bar. The rigid pull rope is made of stainless steel wire rope coated with PTFE, which ensures rigidity while significantly reducing sliding friction with the limiting tube; while the limiting tube is made of polyethylene pipe with mirror-polished inner hole, providing a low-resistance guide channel for the rigid pull rope. The compression spring is made of stainless steel spring wire, and its elastic coefficient matches the contact pressure required when the cleaning scraper extends. The preload is less than that of the return spring to ensure correct action sequence. The preload of the return spring is designed to be greater than the force of the compression spring at maximum compression, thereby ensuring that in the normal state where the electromagnet is not energized, the sliding magnetic block can overcome the force of the compression spring through the rigid pull rope, locking the slide bar and cleaning scraper in the retracted position. This constraint is only released when the electromagnet is energized and generates sufficient repulsive force.

[0012] Furthermore, the fixing frame is fixed to the inner surface of the annular cavity, the end of the reset spring away from the electromagnet is fixed to the inner surface of the mounting tube, the outer surface of the limiting tube is fixed to the inner surface of the mounting tube, one end of the compression spring is fixedly connected to one end of the limiting tube, the end of the compression spring away from the limiting tube is fixedly connected to the end of the slide bar near the rigid pull rope, and the end of the rigid pull rope near the cleaning scraper is fixedly connected to the end of the slide bar near the compression spring.

[0013] Furthermore, a semi-circular push plate is movably connected to the outer surface of the fixed convex ring, and a placement plate is slidably connected to the outer surface of the semi-circular push plate. The semi-circular profile of the fixed convex ring is precisely designed so that the rotational motion of the valve stem can be converted into the linear displacement of the semi-circular push plate; the placement plate is fixed to the plane of the outer wall of the valve body by a positioning pin.

[0014] Furthermore, a connecting rod is provided on the inner surface of the placement plate, and a push spring is arranged around the outer surface of the connecting rod. A first contact piece is fixedly connected to the end of the connecting rod away from the fixing protrusion ring. The first contact piece is electrically connected to a power supply through a wire, and the power supply is electrically connected to a second contact piece through a wire. Both the first and second contact pieces are made of silver-cadmium alloy electrical contact material, and the contact surfaces are gold-plated to ensure low contact resistance and resistance to arc erosion. Part of the insulated wire of the power supply system is embedded in the inner surface of the placement plate, and part is embedded in a dedicated through-hole in the valve body wall, and is encapsulated with epoxy resin.

[0015] Furthermore, the outer surface of the placement plate is fixedly connected to the outer surface of the valve body, the end of the connecting rod away from the first contact piece is fixedly connected to the side of the semicircular push plate near the second contact piece, the end of the pushing spring near the first contact piece is fixedly connected to the inner wall of the placement plate, the end of the pushing spring away from the first contact piece is fixedly connected to the outer surface of the semicircular push plate, and the bottom of the second contact piece is fixedly connected to the inner wall of the placement plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This device features a pre-set annular embedding groove on the inner surface of the outlet valve seat, and is equipped with a radially retractable cleaning scraper. When not in operation, the scraper is completely retracted into the groove, flush with the valve seat sealing surface, and does not interfere with the normal sealing of the ball. During operation, it precisely extends and closely adheres to the annular sealing strip of the valve seat, solving the problem of impurities in the medium (such as scale and rust) accumulating on the sealing strip between the ball and the valve seat, leading to poor sealing and scratching of the precision sealing surface during opening and closing. Furthermore, regular automatic scraping prevents impurities from adhering to the outlet valve seat sealing surface for extended periods, thus preventing seal failure and damage caused by sealing surface contamination.

[0017] 2. This invention uses a fixed protruding ring fixed to the valve stem, a semi-circular push plate, and a contact piece to form a triggering mechanism. This mechanism works in conjunction with a magnetic drive consisting of an electromagnet and a sliding magnetic block. This ensures that the circuit is activated only when the valve stem rotates to a specific angle where the ball disengages from the outlet valve seat, causing the cleaning scraper to extend. This solves the risk of disordered timing of the cleaning mechanism's actions and ensures that the scraping operation is performed 100% within the safe window period when the ball is disengaged from the outlet valve seat seal and a cleaning gap exists. This avoids the cleaning mechanism from malfunctioning when the valve is closed and sealed, which could interfere with the ball's sealing or damage the cleaning scraper itself. It also avoids ineffective scraping in unsafe positions.

[0018] 3. The cleaning scraper designed in this invention uses a special polytetrafluoroethylene composite material and has two working states: one is the "embedded state," in which it perfectly fits the inner groove of the outlet valve seat and participates in the sealing as part of the valve seat sealing surface, without affecting fluid control and sealing performance; the other is the "extended scraping state," in which it moves radially out under the drive of the mechanism, and its back side presses against the valve seat sealing surface at the optimal angle for rotational scraping. This design solves the problem of integrating dynamic sealing and cleaning functions on a fixed valve seat, and solves the problem of cleaning devices occupying sealing space or affecting the integrity of the flow channel in the traditional approach. It avoids the disadvantages of permanently sacrificing valve sealing performance or hindering the movement of the ball and contact with the outlet valve seat due to the addition of a cleaning mechanism, so that the valve has both a "zero interference" sealing state and online self-cleaning capability.

[0019] 4. This invention features a transmission and sealing system comprised of an arc-shaped slide rail, a slider, a connecting strip, and a rotating sealing plate. The rotating sealing plate, with its unique structure of an austenitic stainless steel matrix inlaid with a PTFE sealing layer, reliably transmits rotational torque while forming a precise dynamic seal with the inner wall of the annular cavity. This eliminates the risk of water, impurities, and pressurized fluids intruding, corroding, and jamming precision moving parts, making it possible for the cleaning mechanism to operate stably for extended periods in the high-pressure, humid valve cavity. It effectively avoids the problem of the entire cleaning system failing due to parts corrosion or jamming. Attached Figure Description

[0020] Figure 1 This is the front view of the present invention; Figure 2 This is a cross-sectional view of the valve body of the present invention; Figure 3 This is a schematic diagram of the scraping component of the present invention; Figure 4 This is the present invention. Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the structure of the cleaning scraper of the present invention; Figure 6 This is a cross-sectional view of the mounting tube of the present invention; Figure 7 This is a schematic diagram of the structure of the sliding magnetic block of the present invention; Figure 8 This is a schematic diagram of the triggering component of the present invention; Figure 9 This is a cross-sectional view of the placement plate of the present invention.

[0021] In the diagram: 1. Valve body; 2. Valve stem; 3. Annular cavity; 4. Inlet valve seat; 5. Outlet valve seat; 6. Ball; 7. Cleaning mechanism; 71. Scraping component; 711. Arc slide rail; 712. Slider; 713. Connecting bar; 714. Rotating sealing plate; 715. Mounting tube; 716. Sliding rod; 717. Cleaning scraper; 72. Fitting component; 721. Fixing frame; 722. Electromagnet; 723. Sliding magnet; 724. Return spring; 725. Rigid pull rope; 726. Limiting tube; 727. Compression spring; 73. Triggering component; 731. Fixing convex ring; 732. Semicircular push plate; 733. Placement plate; 734. Connecting rod; 735. Push spring; 736. First contact piece; 737. Power supply; 738. Second contact piece; 8. Electric actuator. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose. Example

[0023] Please see Figure 1 - Figure 9 This invention provides a technical solution: a scraping and cleaning type floating ball valve, comprising: a valve body 1, a valve stem 2, an annular cavity 3, an inlet valve seat 4, an outlet valve seat 5, a ball 6, and an electric actuator 8. A cleaning mechanism 7 is fixedly connected to the inner wall of the valve body 1, and the cleaning mechanism 7 further comprises: The scraping component 71 is fixed to the inner wall of the annular cavity 3, and the scraping component 71 includes an arc-shaped slide rail 711; The fitting component 72 is fixed to the inner wall of the annular cavity 3, and the fitting component 72 includes a fixing frame 721; The triggering component 73 is fixed to the outer surface of the valve stem 2, and the triggering component 73 includes a fixing protrusion ring 731.

[0024] A slider 712 is slidably connected to the outer surface of the arc slide rail 711. A connecting strip 713 is fixedly connected to the lower surface of the slider 712. A rotating sealing plate 714 is fixedly connected to the end of the connecting strip 713 away from the slider 712. The annular cavity 3 serves as the integrated installation base for all cleaning function modules and ensures sealed isolation from the main channel of the valve body 1. The valve stem 2 passes through the valve body 1 and achieves dynamic sealing through packing seal. Its upper end is connected to the actuator to receive rotational torque, and its lower end is connected to the ball 6 by a square tenon to form a driving connection. The ball 6 is placed in the center of the valve cavity and can generate a small axial displacement under the action of medium pressure, thereby making tight contact with the outlet valve seat 5 to achieve sealing. The electric actuator 8 is fixedly connected to the top support fixed on the valve body 1 by bolts to form a rigid whole and provide radial support. At the same time, the output shaft of the electric actuator 8 is connected to the valve stem 2 through a coupling, and the torque output by the motor inside the actuator drives the valve stem 2 to rotate.

[0025] An installation tube 715 is fixedly connected to the inner surface of the rotating sealing plate 714. A sliding rod 716 is slidably connected to the inner surface of the installation tube 715. A cleaning scraper 717 is fixedly connected to one end of the sliding rod 716. The cleaning scraper 717 is made of polytetrafluoroethylene composite material. When not in operation, it is completely embedded in the reserved groove on the inner surface of the outlet valve seat 5, keeping it flush with the valve seat sealing surface without affecting the sealing performance. When the valve stem 2 rotates to the point where the ball 6 is disengaged from the sealing position of the outlet valve seat 5, the cleaning scraper 717 is driven to extend radially through the transmission parts. The scraping angle formed by its back side and the sealing surface of the outlet valve seat 5 is used to scrape along the sealing strip with a certain contact pressure. This material combination can effectively remove deposits such as calcium and magnesium salt scale in the water, while ensuring that the wear rate of the valve seat body is small.

[0026] The arc-shaped slide rail 711 is disposed inside the annular cavity 3 and is fixedly connected to the inner surface of the annular cavity 3. The outer surface of the rotating sealing plate 714 is slidably connected to the inner surface of the annular cavity 3. The cleaning scraper 717 is embedded in the inner surface of the outlet valve seat 5 and is movably connected to the inner surface of the outlet valve seat 5. The arc-shaped slide rail 711 is made of aluminum alloy and is fixed to a preset track on the inner wall of the annular cavity 3 by screws, providing precise arc-shaped rotation guidance for the scraping motion. Both the slider 712 and the arc-shaped slide rail 711 are existing technologies. The connecting strip 713 serves as a rigid transmission element, converting the motion of the slider 712 into the rotational motion of the rotating sealing plate 714. The rotating sealing plate 714 is a composite material with an austenitic stainless steel matrix and an inlaid PTFE sealing layer. Its two outer surfaces maintain a precise dynamic fit with the inner wall of the annular cavity 3, achieving both rotational sealing and controlling frictional power consumption.

[0027] An electromagnet 722 is fixedly attached to the inner surface of the mounting bracket 721. A sliding magnetic block 723 is positioned directly below the electromagnet 722. A return spring 724 is fixedly attached to the bottom of the sliding magnetic block 723, and a rigid pull rope 725 is fixedly attached to the center of the bottom of the sliding magnetic block 723. The mounting bracket 721 serves as the mounting base for the electromagnetic assembly and is threadedly fastened to the non-moving area of ​​the annular cavity 3. When the electromagnet 722 is energized, it generates a repulsive electromagnetic force with the sliding magnetic block 723. This repulsive force can overcome the preload of the return spring 724 and drive the component to move. The sliding magnetic block 723 is made of neodymium iron boron permanent magnet material.

[0028] A limiting tube 726 is slidably connected to the outer surface of the rigid draw rope 725, and a compression spring 727 is arranged around the outer side of the rigid draw rope 725 near the slide bar 716. The rigid draw rope 725 is made of stainless steel wire rope coated with PTFE, which ensures rigidity and significantly reduces sliding friction with the limiting tube 726; while the limiting tube 726 is made of polyethylene pipe, and the inner hole is mirror polished to provide a low-resistance guide channel for the rigid draw rope 725. The compression spring 727 is made of stainless steel spring wire, and its elastic coefficient matches the contact pressure required when the cleaning scraper 717 extends. The preload is less than that of the return spring 724 to ensure correct action timing. The preload of the return spring 724 is designed to be greater than the force of the compression spring 727 at maximum compression. This ensures that when the electromagnet 722 is not energized, the sliding magnetic block 723 can overcome the force of the compression spring 727 through the rigid pull rope 725 and lock the slide bar 716 and the cleaning scraper 717 in the retracted position. This constraint is only released when the electromagnet 722 is energized and generates sufficient repulsive force.

[0029] The fixing bracket 721 is fixedly connected to the inner surface of the annular cavity 3. The end of the return spring 724 away from the electromagnet 722 is fixedly connected to the inner surface of the mounting tube 715. The outer surface of the limiting tube 726 is fixedly connected to the inner surface of the mounting tube 715. One end of the compression spring 727 is fixedly connected to one end of the limiting tube 726. The end of the compression spring 727 away from the limiting tube 726 is fixedly connected to the end of the slide bar 716 near the rigid pull rope 725. The end of the rigid pull rope 725 near the cleaning scraper 717 is fixedly connected to the end of the slide bar 716 near the compression spring 727.

[0030] A semi-circular push plate 732 is movably connected to the outer surface of the fixed protruding ring 731, and a placement plate 733 is slidably connected to the outer surface of the semi-circular push plate 732. The semi-circular profile of the fixed protruding ring 731 is precisely designed so that the rotational motion of the valve stem 2 can be converted into the linear displacement of the semi-circular push plate 732; the placement plate 733 is fixed to the plane of the outer wall of the valve body 1 by a positioning pin.

[0031] A connecting rod 734 is provided on the inner surface of the placement plate 733, and a push spring 735 is arranged around the outer surface of the connecting rod 734. A first contact piece 736 is fixedly connected to the end of the connecting rod 734 away from the fixing protrusion ring 731. The first contact piece 736 is electrically connected to a power supply 737 through a wire, and the power supply 737 is electrically connected to a second contact piece 738 through a wire. Both the first contact piece 736 and the second contact piece 738 are made of silver-cadmium alloy electrical contact material, and the contact surface is gold-plated to ensure low contact resistance and resistance to arc erosion. Part of the insulated wire of the power supply system is buried in the inner surface of the placement plate 733, and part of it is buried in a dedicated wire hole in the wall of the valve body 1 and is potted with epoxy resin.

[0032] The outer surface of the placement plate 733 is fixedly connected to the outer surface of the valve body 1. The end of the connecting rod 734 away from the first contact piece 736 is fixedly connected to the side of the semicircular push plate 732 near the second contact piece 738. The end of the pushing spring 735 near the first contact piece 736 is fixedly connected to the inner wall of the placement plate 733. The end of the pushing spring 735 away from the first contact piece 736 is fixedly connected to the outer surface of the semicircular push plate 732. The bottom of the second contact piece 738 is fixedly connected to the inner wall of the placement plate 733.

[0033] The working principle is as follows: First, the scraping and cleaning type floating ball valve of this device has the same basic fluid control function as a conventional floating ball valve. The upper end of the valve stem 2 is connected to the electric actuator 8, and the lower end drives the ball 6 to rotate in the valve cavity via a square tenon. When the valve needs to be opened, the electric actuator 8 controls the valve stem 2 to rotate the ball 6 90 degrees, so that the through hole inside the ball 6 is aligned with the passage of the inlet valve seat 4 and the outlet valve seat 5. At this time, the fluid can pass through smoothly, and due to the balancing effect of fluid dynamic pressure, the ball 6 is roughly in the center of the valve cavity, with no obvious contact with the valve seats on both sides.

[0034] When the valve needs to be closed, the valve stem 2 rotates the ball 6 90 degrees again, making the through hole of the ball 6 perpendicular to the fluid channel. The fluid impacts the solid outer surface of the ball 6. The medium pressure acts on the upstream side of the ball 6, pushing it to produce a slight axial displacement, causing it to press tightly against the sealing edge of the outlet valve seat 5 on the downstream side, thereby achieving a forced seal. However, this working mechanism makes it easy for impurities such as calcium and magnesium scale, rust, and silt in the water to be squeezed and remain on the contact sealing edge between the outlet valve seat 5 and the ball 6. Over time, these impurities will act like gaskets, preventing direct contact between the ball 6 and the sealing edge of the outlet valve seat 5, leading to seal failure or scratching the precision sealing surface when the valve is opened and closed. The cleaning and scraping mechanism designed in this invention is specifically designed to clean this critical area after each action that may cause impurity accumulation.

[0035] The core innovation of this device lies in the fact that its cleaning action is only performed when the ball 6 is out of contact with the outlet valve seat 5 or when the valve is in a specific position, thus avoiding interference with the sealing function.

[0036] In the initial (non-working) state, the tension exerted by the return spring 724 on the slide bar 716 by pushing the sliding magnet 723 and the rigid pull rope 725 is always greater than the pushing force exerted by the compression spring 727 on the slide bar 716. Under this mechanical relationship, the cleaning scraper 717 is therefore firmly locked in the retracted position of the inner groove of the outlet valve seat 5, that is, fully embedded in the reserved groove on the inner surface of the outlet valve seat 5, flush with the sealing surface, without affecting the sealing performance of the outlet valve seat 5.

[0037] When the electric actuator 8 drives the valve stem 2 to rotate, the ball 6 opens from the closed position. When the ball 6 is released from the pressure state with the outlet valve seat 5, it enters the cleanable zone. The rotation of the valve stem 2 synchronously drives the fixed convex ring 731 fixed thereon to rotate. When the specific semi-circular contour of the fixed convex ring 731 rotates to a certain angle, it contacts the semi-circular push plate 732 and pushes it to move linearly along the inside of the placement plate 733. The linear movement of the semi-circular push plate 732 compresses the push spring 735 to store energy for reset; on the other hand, it pushes the first contact piece 736 to the second contact piece 738 through the connecting rod 734 until the two make reliable contact. The contact between the first contact piece 736 and the second contact piece 738 turns on the low-voltage control circuit composed of the power supply 737, wires, and contact pieces. The current is transmitted through the wires embedded in the wall of the valve body 1 and protected by epoxy resin potting to the electromagnet 722 fixed to the fixing frame 721.

[0038] Subsequently, the electromagnet 722 is energized, generating a magnetic field that produces a strong repulsive force with the sliding magnetic block 723 (a neodymium iron boron permanent magnet) directly below. This repulsive force overcomes the preload pressure of the return spring 724, pushing the sliding magnetic block 723 downwards along the inner wall of the mounting tube 715 and compressing the return spring 724. As mentioned above, since the tension exerted by the return spring 724 on the slide bar 716 by pushing the sliding magnetic block 723 and the rigid pull rope 725 is always greater than the pushing force of the compression spring 727 on the slide bar 716, the cleaning scraper 717 is firmly locked in the retracted position of the inner groove of the outlet valve seat 5, embedded in the reserved groove on the inner surface of the outlet valve seat 5, flush with the sealing edge. Therefore, when the sliding magnetic block 723 moves downwards under the repulsive force, the rigid pull rope 725 (a stainless steel wire rope coated with PTFE) fixed to it becomes loose, and its constraint force on the slide bar 716 disappears. At this moment, the pre-compressed compression spring 727 quickly releases its elastic potential energy, and its force pushes the slide bar 716 to slide radially toward the outlet valve seat 5 inside the mounting tube 715.

[0039] The radial movement of the slide bar 716 ultimately drives the cleaning scraper 717, fixed to its end, to smoothly extend from the embedded groove of the outlet valve seat 5 until its back surface is in contact with the annular sealing surface of the outlet valve seat 5. Simultaneously, a small drive motor (existing technology, not shown in the figure) integrated inside the power slider 712 is activated, driving the power slider 712 to slide annularly on the outer surface of the existing annular slide rail 711. Further rotation is achieved through the connecting strip 713, the mounting tube 715, and the cleaning scraper 717, causing the cleaning scraper 717 to scrape the sealing edge surface where the outlet valve seat 5 contacts the ball 6. Specifically, the power slider 712 begins to slide annularly on the outer surface of the annular slide rail 711, and the movement of the power slider 712 is converted into the rotational power of the rotating sealing plate 714 through the connecting strip 713. The rotating sealing plate 714 is a composite material with an austenitic stainless steel matrix and an embedded PTFE sealing layer, and its two outer surfaces form a precise dynamic seal with the inner wall of the annular cavity 3. This design serves a dual purpose: firstly, it reliably transmits rotational power to the internal mounting tube 715, slide bar 716, and cleaning scraper 717; secondly, it ensures that the pressurized fluid within the valve chamber is completely isolated from the annular cavity 3, effectively preventing moisture leakage into the space where the annular slide rail 711 and power slider 712 are located, thus avoiding corrosion and lubrication failure problems. Therefore, under the constant and gentle pressure provided by the compression spring 727, the extended cleaning scraper 717 adheres tightly to the sealing surface of the outlet valve seat 5, rotating together with the rotating sealing plate 714 to thoroughly scrape away impurities from the entire annular sealing strip of the outlet valve seat 5. The cleaning scraper 717 is made of polytetrafluoroethylene composite material, with carefully designed hardness, effectively removing stubborn scale while ensuring minimal wear on the valve seat body, achieving the dual purpose of cleaning and protection. It should be noted that when the sliding magnet 723 rotates synchronously with the mounting tube 715, the slide bar 716, and the cleaning scraper 717, it gradually deviates from directly below the electromagnet 722, causing the magnetic repulsion between them to weaken and eventually disappear. At this time, the elastic force of the return spring 724 on the sliding magnet 723 becomes dominant, pushing the sliding magnet 723 to reset, thereby causing the rigid pull rope 725 to tighten again, creating a tendency to pull the slide bar 716 and the cleaning scraper 717 back. However, since the cleaning scraper 717 has already extended from the embedded groove of the outlet valve seat 5 and is in close contact with its outer sealing surface, despite the reset tendency, the cleaning scraper 717 will remain extended due to the constraint of the outlet valve seat 5 structure, and will continue to scrape and clean the surface.

[0040] It should also be added that: such as Figure 6 and Figure 7As shown, the slide bar 716 adopts a variable cross-section design, with its front end near the cleaning scraper 717 refined into an S-shaped structure with a specific curvature. This S-shaped structure provides effective clearance space during the extension of the cleaning scraper 717 from the reserved groove of the outlet valve seat 5 and its subsequent rotation. That is, the S-shaped part of the slide bar 716 is located below the outlet valve seat 5, ensuring that the body of the slide bar 716 will not have any mechanical interference with the outlet valve seat 5, thereby avoiding potential problems such as jamming or breakage. Meanwhile, in the initial sealing state, when the cleaning scraper 717 is fully embedded in the reserved groove and the ball 6 presses against the sealing edge, the connection end of this specially configured slide bar 716 is located in the non-contact area. The sealing effect is achieved entirely by the upper surface of the cleaning scraper 717 and the valve seat groove, ensuring the integrity and reliability of the core sealing pair. The annular cross section at the connection between the slide bar 716 and the cleaning scraper 717 does not participate in the sealing. The slide bar 716 adopts a variable cross section design and is fixedly connected to the cleaning scraper 717. The strength of both and the connection is reliable.

[0041] Finally, when the water flow needs to be shut off, i.e., the valve stem 2 continues to rotate to control the ball 6, causing the protruding part of the fixed ring 731 to disengage from the semi-circular push plate 732, the previously compressed push spring 735 is immediately released, pushing the semi-circular push plate 732, connecting rod 734, and first contact piece 736 to reset, causing the first contact piece 736 to separate from the second contact piece 738, and the control circuit is cut off. The electromagnet 722 is de-energized, the magnetic field disappears, and the repulsive force on the sliding magnetic block 723 also disappears. Under the strong restoring force of the reset spring 724, the sliding magnetic block 723 is pushed upward to return to its initial position. The upward movement of the sliding magnetic block 723 re-tightens the rigid pull rope 725. The tension applied to the slide bar 716 by the rigid pull rope 725 quickly exceeds the thrust of the compression spring 727, thereby forcibly pulling back the slide bar 716 and the cleaning scraper 717 fixed thereon, so that they are re-embedded into the preset inner groove of the water outlet valve seat 5.

[0042] It should be noted that, to ensure the cleaning scraper 717 retracts precisely into the groove of the outlet valve seat 5 during reset, rather than erroneously impacting the valve seat outside the groove, this invention incorporates another design: a connected electric actuator 8 (existing technology) precisely controls the rotation angle of the valve stem 2. When the valve stem 2 rotates to the instant the fixed convex ring 731 disengages from the semi-circular push plate 732, the electric actuator 8 ensures the entire scraping component 71 stops precisely at a predetermined 'return angle,' at which point the power slider 712 also stops rotating along the outer surface of the annular slide rail 711. At this angle, the cleaning scraper 717 achieves precise radial alignment with the groove on the outlet valve seat 5. Subsequently, the pulling action of the rigid pull rope 725 and the retraction action of the slide bar 716 work together to guide the cleaning scraper 717 smoothly and accurately into the groove. The entire reset process is automatically completed by the control system before the ball 6 is pushed by water pressure, begins to move towards the outlet valve seat 5, and achieves final sealing. This provides ample space and time for the sealing movement of the ball 6, thus perfectly avoiding any interference between the cleaning scraper 717 and the moving ball 6.

[0043] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A scraping and cleaning type floating ball valve, comprising: The valve body (1), valve stem (2), annular cavity (3), inlet valve seat (4), outlet valve seat (5), ball (6), and electric actuator (8) are characterized in that: a cleaning mechanism (7) is fixedly connected to the inner wall of the valve body (1), and the cleaning mechanism (7) further comprises: The scraping component (71) is fixed to the inner wall of the annular cavity (3), and the scraping component (71) includes an arc slide rail (711). The fitting component (72) is fixed to the inner wall of the annular cavity (3), and the fitting component (72) includes a fixing frame (721). A triggering component (73) is fixed to the outer surface of the valve stem (2), and the triggering component (73) includes a fixing protrusion (731).

2. The scraping and cleaning type floating ball valve according to claim 1, characterized in that: The outer surface of the arc slide rail (711) is slidably connected to a slider (712), and a connecting strip (713) is fixedly connected to the lower surface of the slider (712). A rotating sealing plate (714) is fixedly connected to one end of the connecting strip (713) away from the slider (712).

3. The scraping and cleaning type floating ball valve according to claim 2, characterized in that: The inner surface of the rotating sealing plate (714) is fixedly connected to an installation tube (715), and the inner surface of the installation tube (715) is slidably connected to a slide bar (716). One end of the slide bar (716) is fixedly connected to a cleaning scraper (717).

4. The scraping and cleaning type floating ball valve according to claim 3, characterized in that: The arc slide rail (711) is located inside the annular cavity (3) and is fixedly connected to the inner surface of the annular cavity (3). The outer surface of the rotating sealing plate (714) is slidably connected to the inner surface of the annular cavity (3). The cleaning scraper (717) is embedded in the inner surface of the water outlet valve seat (5) and is movably connected to the inner surface of the water outlet valve seat (5).

5. The scraping and cleaning type floating ball valve according to claim 1, characterized in that: An electromagnet (722) is fixed to the inner surface of the fixing frame (721). A sliding magnetic block (723) is arranged directly below the electromagnet (722). A return spring (724) is fixed to the bottom of the sliding magnetic block (723). A rigid pull rope (725) is fixed to the center of the bottom of the sliding magnetic block (723).

6. The scraping and cleaning type floating ball valve according to claim 5, characterized in that: The outer surface of the rigid pull rope (725) is slidably connected to a limit tube (726), and a compression spring (727) is arranged around the outside of the rigid pull rope (725) near the slide bar (716).

7. The scraping and cleaning type floating ball valve according to claim 6, characterized in that: The fixing frame (721) is fixed to the inner surface of the annular cavity (3). The end of the reset spring (724) away from the electromagnet (722) is fixed to the inner surface of the mounting tube (715). The outer surface of the limiting tube (726) is fixed to the inner surface of the mounting tube (715). One end of the compression spring (727) is fixedly connected to one end of the limiting tube (726). The end of the compression spring (727) away from the limiting tube (726) is fixedly connected to the end of the slide bar (716) near the rigid pull rope (725). The end of the rigid pull rope (725) near the cleaning scraper (717) is fixedly connected to the end of the slide bar (716) near the compression spring (727).

8. The scraping and cleaning type floating ball valve according to claim 1, characterized in that: The outer surface of the fixed protruding ring (731) is movably connected to a semi-circular push plate (732), and the outer surface of the semi-circular push plate (732) is slidably connected to a placement plate (733).

9. The scraping and cleaning type floating ball valve according to claim 8, characterized in that: The inner surface of the placement plate (733) is provided with a connecting rod (734), and the outer surface of the connecting rod (734) is surrounded by a push spring (735). The end of the connecting rod (734) away from the fixed protrusion ring (731) is fixedly connected to a first contact piece (736). The first contact piece (736) is electrically connected to a power supply (737) through a wire. The power supply (737) is electrically connected to a second contact piece (738) through a wire.

10. The scraping and cleaning type floating ball valve according to claim 9, characterized in that: The outer surface of the placement plate (733) is fixed to the outer surface of the valve body (1). The end of the connecting rod (734) away from the first contact piece (736) is fixed to the side of the semicircular push plate (732) near the second contact piece (738). The end of the push spring (735) near the first contact piece (736) is fixed to the inner wall of the placement plate (733). The end of the push spring (735) away from the first contact piece (736) is fixed to the outer surface of the semicircular push plate (732). The bottom of the second contact piece (738) is fixed to the inner wall of the placement plate (733).

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