An adjustable split butterfly valve

Abstract

This invention relates to the field of valve technology and discloses an adjustable split butterfly valve. The butterfly valve includes a valve body, a valve stem, a butterfly plate, and a drive device. A filter section is adjacent to the opposite side of the butterfly plate. The operation mode of the filter section is switched by rotating the butterfly plate: in the working state, the butterfly plate disengages from the adjacent filter section and moves closer to the other filter section, driving the filter section to filter the medium; in the non-working state, the butterfly plate rotates in the opposite direction to reset, driving the filter section to isolate and block the medium; when the butterfly valve is closed, the butterfly plate resets and removes the thrust on the adjusting slide plate, causing the adjusting slide plate to radially reset and close the side cover, sealing the filter seat in the protective cavity formed by the side cover and the butterfly plate, achieving complete isolation from the medium. This invention avoids long-term immersion and corrosion of the filter screen in a non-flowing state, extending its service life; at the same time, it prevents the re-adhesion of removed slurry under hydraulic differential, ensuring long-term cleanliness of the filter screen.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to an adjustable split butterfly valve. Background Technology

[0002] Butterfly valves, as a simple fluid control device, have a disc-shaped closing element (valve disc) that is opened and closed by rotating 0° to 90° around an axis inside the valve seat. They are widely used in the control of various fluids such as air, water, steam, corrosive media, mud, oil, liquid metals, and radioactive media.

[0003] When conveying media such as slurry containing solid particles, slurry accumulation easily occurs on the surface of the butterfly plate, affecting sealing performance and potentially causing valve jamming. To address this issue, patent document CN111649142A discloses a novel anti-clogging butterfly valve. This butterfly valve includes a drive unit, a backflushing device, a valve body, a valve stem, and a butterfly plate connected in sequence. The backflushing device is located between the drive unit and the valve body, and a bushing is provided on the butterfly plate. The valve stem passes through the backflushing device and the bushing and connects to the drive unit. Specifically, this design... A filter screen is fixed on the top, which supports the slurry and prevents large solids from accumulating on one side of the disc plate, thus achieving the slurry collection function. At the same time, several nozzles are provided on the bushing. The nozzles include a spray pipe and a spray pipe cover that are hinged together. The spray pipe is equipped with a magnet for closing the spray pipe cover. By using the nozzles arranged on the disc plate, the filter screen can be backflushed or backwashed to remove the slurry on the filter screen. In addition, the valve stem adopts a hollow structure to provide a channel for high-pressure gas or high-pressure cleaning agent, making the overall structure more compact and easy to install.

[0004] However, the existing anti-clogging butterfly valves still have the following defects in actual use: When the butterfly valve is in a non-flowing state (i.e., closed state), the filter screen is often immersed in the fluid medium containing slurry; after the backflushing or backwashing device finishes cleaning the filter screen, due to the influence of hydraulic pressure difference and medium flow characteristics, the removed slurry particles are very easy to re-adhere to the surface of the filter screen, resulting in a significant reduction in cleaning effect and failure to achieve long-term cleaning of the filter screen; at the same time, because the filter screen is immersed in the medium for a long time and repeatedly experiences the adhesion and peeling of slurry, it is severely affected by medium corrosion, which directly shortens the service life of the filter screen and increases the maintenance cost of the equipment. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an anti-clogging butterfly valve that can isolate the medium to protect the filter screen in a non-flow state, addressing the problem that slurry easily adheres and the filter screen is corroded after backwashing of existing anti-clogging butterfly valves.

[0006] This invention provides the following technical solution: an adjustable split butterfly valve, comprising a valve body, a valve stem radially penetrating its medium flow channel, a butterfly plate fixed to the surface of the valve stem for adjusting the flow rate, and a driving device for driving the valve stem to rotate circumferentially. The butterfly plates are centrally symmetrically arranged on opposite sides of the valve stem, with their proximal ends fixed to the valve stem and rotating about the central axis of the valve stem. A filter section adjacent to the other butterfly plate on the opposite side is respectively provided on one side along the valve opening rotation direction of the butterfly plate, with its proximal end movably connected to the valve stem. During the rotation of the butterfly plate to open and close the medium flow channel, the flow regulation drive of the filter section can be triggered. In the working state, the butterfly plate, with the valve stem as its axis, disengages from its adjacent filter section and rotates circumferentially towards the other filter section on the opposite side to drive the filter section to filter the flowing medium. In the non-working state, the butterfly plate, with the valve stem as its axis, gradually disengages from the currently contacting filter section and rotates circumferentially back to its original position on the side of the originally adjacent filter section to drive the filter section to isolate and block the medium.

[0007] Furthermore, the two sets of filter sections are arranged symmetrically in the center and extend in opposite parallel directions to both sides with the central axis perpendicular to the valve stem as the reference. When the butterfly plate closes the valve and rotates to 0°, the butterfly plate rotates circumferentially to the side of the originally adjacent filter section until it fits against it, thereby forming two sets of opposite double-layer sealing structures, which are used to isolate the medium in the non-flow state to achieve isolation and protection of the filter screen.

[0008] Furthermore, the filtration unit includes a filter seat fixed within the media flow channel, with a guide rail extending from its proximal end around the circumference of the valve stem and movably fitting thereto. The curved skeleton of the filter seat is sealed and fixed within the media flow channel. A side cover is fixed on the side of the butterfly plate that is close to it when the valve is turned on. The side cover has a semi-enclosed structure, with an opening on the side close to the filter seat to cover the filter screen. An adjusting slide plate that can slide radially is provided inside the side cover. The adjusting slide plate is pushed back by the radial force of the side cover during the rotation of the butterfly plate when the valve is turned on, thereby adjusting the opening degree of the opening on the side cover.

[0009] Furthermore, the side cover has multiple openings arranged radially, and the adjusting slide plate has partitions arranged in an array corresponding to each opening; a stop arm is provided at one end of the adjusting slide plate near the valve stem, and the stop arm extends into a pre-set guide groove in the guide rail.

[0010] Furthermore, one end of the adjusting slide near the valve stem has a branch that extends movably through the side wall of the port. This branch is fixed to the stop arm, which is a telescopic structure. One end of the stop arm is fixedly connected to the branch of the adjusting slide, and the other end extends into the guide groove of the guide rail and is axially fixed with a limit block.

[0011] Furthermore, the butterfly plate is provided with a relief groove at the connection end with the valve stem, which is used to allow the guide rail to slide into the groove when the valve is rotated; a drive groove adapted to the profile of the stop arm is provided at one end of the butterfly plate adjacent to the relief groove.

[0012] Furthermore, the butterfly plate has a semi-enclosed structure, with an opening on the side of the filter section adjacent to it when the valve is closed, and can be fitted to the side of the filter seat opposite the side cover to form a protective chamber to enclose the filter screen inside.

[0013] Furthermore, the valve body has a flushing channel that intersects with the medium flow channel at the cross-section where the butterfly plate is in the closed state; the top and bottom of the curved wall of the protection chamber are provided with flushing holes that can connect with the flushing channel.

[0014] Furthermore, the valve body has a receiving cavity coaxial with the valve stem at the top of the pipe wall, and a liquid inlet communicating with the top of the receiving cavity. The other end of the liquid inlet is connected to a flushing source. The receiving cavity is connected to the medium flow channel through a diversion port, and a liquid outlet is provided at the bottom of the medium flow channel. The liquid inlet, receiving cavity, diversion port and liquid outlet constitute the flushing flow channel, wherein the liquid outlet and diversion port are symmetrically arranged on both sides of the valve stem for communicating with their respective protective chambers.

[0015] Furthermore, the butterfly valve is also equipped with a flow-stopping device that adjusts the opening and closing of the flushing channel in conjunction with the rotation of the valve stem. The flow-stopping device includes a drive valve plate that is movable within the receiving cavity and coaxially fixed to the surface of the valve stem. The surface of the drive valve plate has a through hole. By rotating it, it can be misaligned or aligned with the inlet and the diversion port to cut off or connect the flushing source. The flow-stopping device also includes a retractable part located at the bottom of the valve body. By rotating it, the opening and closing of the outlet can be controlled, and the flow channel can be switched in conjunction with the drive valve plate.

[0016] The technical effects and advantages of this invention are as follows:

[0017] When the butterfly valve is in the closed position, the butterfly plate rotates to reset and removes the thrust on the regulating slide plate, causing the regulating slide plate to radially reset and close the side cover. This seals the filter seat within the protective chamber formed by the side cover and the butterfly plate, achieving complete isolation from the slurry-containing medium. This effectively avoids the problem of corrosion caused by long-term immersion of the filter screen in a non-flowing state, significantly extending its service life. At the same time, since the filter screen no longer comes into contact with the medium after cleaning, the phenomenon of the removed slurry re-adhering under the action of hydraulic differential is eliminated, ensuring long-term cleanliness of the filter screen. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the disassembled structure of the valve body and electric actuator of the present invention.

[0020] Figure 3 This is a schematic diagram of the valve body of the present invention when it is in a non-flow state.

[0021] Figure 4 For the present invention Figure 3A front view of the valve body, valve stem, and retraction section.

[0022] Figure 5 For the present invention Figure 3 Top view of the structure of the valve stem, butterfly plate, and filter section.

[0023] Figure 6 For the present invention Figure 5 A schematic diagram of the structure when the valve stem and butterfly plate are rotated at a certain angle relative to the filter section.

[0024] Figure 7 For the present invention Figure 6 A schematic diagram of the disassembled structure of the middle filter section.

[0025] Figure 8 This is a schematic diagram of the adjusting slide structure of the present invention.

[0026] Figure 9 This is a schematic diagram of the valve body of the present invention when it is in a flow-through state.

[0027] Figure 10 For the present invention Figure 9 A front view of the valve body, valve stem, and retraction section.

[0028] Figure 11 For the present invention Figure 9 Top view of the structure of the valve stem, butterfly plate, and filter section.

[0029] Figure 12 For the present invention Figure 11 A schematic diagram of the butterfly plate and filter section interacting on one side of the valve stem.

[0030] Figure 13 This is a schematic diagram of the filter seat structure of the present invention.

[0031] Figure 14 This is a schematic diagram of the butterfly plate structure of the present invention.

[0032] The attached figures are labeled as follows: 1. Valve body; 11. Inlet; 12. Outlet; 13. Receiving cavity; 14. Diverter; 2. Electric actuator; 3. Valve stem; 4. Butterfly plate; 41. Clearance groove; 42. Drive groove; 43. Flushing hole; 44. Unblocking protrusion; 5. Drive valve plate; 6. Retraction section; 61. Gate; 62. Connecting rod; 63. Drive turntable; 7. Filter section; 71. Filter base; 711. Guide rail; 712. Ejection chamber; 72. Side cover; 721. Through port; 73. Adjusting slide plate; 731. Partition; 732. Stop arm; 733. Limit block; 734. Brush bristles. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The adjustable split butterfly valve involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Reference Figures 1 to 3 As shown, this invention provides an adjustable split butterfly valve, including a valve body 1, a valve stem 3 radially penetrating its medium flow channel, a butterfly plate 4 fixed to the surface of the valve stem 3 for adjusting the flow rate, and a drive device for driving the valve stem 3 to rotate circumferentially. The drive device can be an electric actuator 2 with automatic control function or a low-cost manual knob. By driving the valve stem 3 to rotate, it drives the butterfly plate 4 to perform the valve opening and closing action to control the opening and closing of the medium flow channel. According to international convention, rotating the valve stem 3 counterclockwise is the valve opening action, and the butterfly plate 4 rotates with the valve stem 3 from 0° to 90°, that is, from the direction perpendicular to the medium flow channel to the parallel direction, opening the medium flow; conversely, rotating clockwise returns it to 0°, blocking the medium flow.

[0035] The electric actuator 2 is detachably installed on the valve seat integrally cast on the top of the valve body 1, and the contact part of the two is fixed by bolts; the output end of the electric actuator 2 is fixedly connected to the end of the valve stem 3 that extends out of the valve seat, and its internal components include the electronic part of the control module, the power part of the execution module, and the sensing part of the feedback and indication module; no manual operation of the handwheel is required on site, and the operator can remotely control the opening and closing of the valve or adjust the opening degree by clicking the mouse on the computer in the central control room or through the preset logic program;

[0036] Reference Figure 3 , Figures 5 to 8 ,as well as Figure 9 , Figures 11 to 13As shown, the butterfly plate 4 is centrally symmetrically arranged on opposite sides of the valve stem 3. It is semi-circular with a curvature adapted to the curvature of the inner wall of the medium flow channel. Its proximal end is fixed to the valve stem 3 and rotates around the central axis of the valve stem 3, from 0° to 90°, changing its direction from perpendicular to the medium flow channel to parallel. On one side along the valve opening rotation direction of the butterfly plate 4, a filter section 7 is respectively provided adjacent to the other butterfly plate 4 on the opposite side, and its proximal end is movably connected to the valve stem 3. During the rotation of the butterfly plate 4 to open and close the medium flow channel, the flow regulation drive of the filter section 7 can be triggered. In the working state, the butterfly plate 4 disengages from its adjacent filter section 7 around the valve stem 3 and rotates circumferentially towards the other filter section 7 on the opposite side to drive the filter. Section 7 filters the flowing medium; in the non-working state, the butterfly plate 4 gradually disengages from the other filter section 7 currently in contact with it around the valve stem 3 and rotates circumferentially to reset itself towards the originally adjacent filter section 7, thereby driving the filter section 7 to isolate and block the medium; thus realizing the switching of the operating mode of the filter section 7 between the flow state and the non-flow state, that is, compatible with the filtration function in the flow mode and the isolation and protection function in the non-flow mode, thereby effectively avoiding the problem of long-term immersion and corrosion of the filter screen in the non-flow state, and significantly extending its service life; at the same time, since the filter screen no longer comes into contact with the medium after cleaning, the phenomenon of the removed slurry re-adhering under the action of hydraulic differential is eliminated, ensuring the long-term cleanliness of the filter screen;

[0037] The two sets of filter sections 7 are arranged symmetrically in the center and extend in opposite parallel directions to both sides with the central axis perpendicular to the valve stem 3 as the reference. When the butterfly plate 4 is rotated to 0° when the valve is closed, the butterfly plate 4 rotates circumferentially to the side of the originally adjacent filter section 7 until it fits with it, thereby forming two sets of opposite double-layer sealing structures, which are used to isolate the medium in the non-flow state to achieve isolation and protection of the filter screen.

[0038] The filter unit 7 includes a filter seat 71 fixed in the medium flow channel. The filter seat 71 is semi-circular and its curvature is adapted to the curvature of the inner wall of the medium flow channel. Its proximal end extends around the circumference of the valve stem 3 and has a guide rail 711 that is movably fitted to it. The curved skeleton of the filter seat 71 is sealed and fixed in the medium flow channel, so that the position of the filter seat 71 is relatively fixed, does not rotate with the valve stem 3 and maintains a sealed connection with the valve stem 3. A side cover 72 is fixed on the side of the butterfly plate 4 that is close to it when the valve is turned on. The side cover 72 has a semi-enclosed structure and the side close to the filter seat 71 is open to cover the filter screen. An adjusting slide plate 73 that can slide radially is provided inside the side cover 72. The adjusting slide plate 73 is pushed back by the radial force of the side cover 72 during the rotation of the butterfly plate 4 when the valve is turned on, so as to adjust the opening degree of the opening 721 on the side cover 72.

[0039] The side cover 72 has multiple openings 721 arranged radially on it. The outer contour of the adjusting slide plate 73 is approximately semi-circular, and the inner part has partitions 731 arranged in an array corresponding to the openings 721. The adjusting slide plate 73 is provided with a stop arm 732 at one end near the valve stem 3. The stop arm 732 extends into the guide groove preset in the guide rail 711 to provide support for the adjusting slide plate 73. When it is pushed by the butterfly plate 4, it can slide smoothly along the guide groove, causing the partitions 731 and the openings 721 to be misaligned, thereby expanding the opening of the openings 721.

[0040] One end of the adjusting slide plate 73 near the valve stem 3 forms a branch that can move through the side wall of the port 721. This branch is fixed to the stop arm 732, so that the port 721 is the only flow path between the side cover 72 and the filter seat 71. The stop arm 732 is a telescopic structure. One end of it is fixedly connected to the branch of the adjusting slide plate 73, and the other end extends into the guide groove of the guide rail 711 and is axially fixed with a limit block 733, so that the stop arm 732 is constrained in the guide groove and does not derail. It can also extend and retract adaptively along the curvature of the guide groove to compensate for the distance change between the guide groove and the adjusting slide plate 73. When the stop arm 732 slides along the guide groove toward the filter seat 71 to the limit position, the contour of the adjusting slide plate 73 has no contact interference with the side cover 72, so that the partition 731 and the port 721 are completely misaligned. At this time, the opening of the port 721 reaches its peak.

[0041] A brush bristles 734 arranged in a radial array are fixed on the side of the adjusting slide plate 73 facing the filter seat 71. The brush bristles 734 are in contact with the filter screen of the filter seat 71 at least and can move synchronously with the adjusting slide plate 73 to physically wipe and clean the main flow parts of the filter screen, thereby reducing the amount of solid impurities such as slurry adhering.

[0042] The curved frame of the filter seat 71 has an ejection cavity 712 that communicates with the guide rail 711. An elastic device, such as a spring, is installed inside the cavity. When the butterfly plate 4 removes the thrust on the adjusting slide plate 73, the elastic force of the elastic device is released, and the stop arm 732 slides to the end of the guide groove near the valve stem 3. That is, the adjusting slide plate 73 can be radially reset along the side cover 72, so that the partition plate 731 and the opening 721 on the surface of the side cover 72 are realigned.

[0043] The butterfly plate 4 and the valve stem 3 are connected by a relief groove 41, which allows the guide rail 711 to slide into it when the valve is rotated. The butterfly plate 4 near the relief groove 41 is provided with a drive groove 42 that matches the contour of the stop arm 732. When the relief groove 41 enters the outer circumference of the guide rail 711 and slides circumferentially along its surface, the drive groove 42 abuts against the stop arm 732 and applies a tangential force. This component of the tangential force is converted into a thrust that drives the adjusting slide plate 73 to slide radially along the side cover 72 until the stop arm 732... When the guide rail 711 is pushed to the limit position along the guide groove towards the filter seat 71, the guide rail 711 is fully embedded in the clearance groove 41. At this time, the butterfly plate 4 has rotated from 0° to 90°, changing its direction from perpendicular to the medium flow channel to parallel. The coordinated cooperation of the clearance groove 41, drive groove 42, guide rail 711 and regulating slide plate 73 structure not only ensures the smoothness of the entire operation of the butterfly plate 4 switching valve and avoids motion interference, but also realizes the reliable drive of the regulating slide plate 73, forming an orderly and stable mechanical transmission cooperation.

[0044] The butterfly plate 4 has a semi-enclosed structure. When facing the closed valve, it has an opening on the side of the filter section 7 that is adjacent to it. It can also fit against the side of the filter seat 71 opposite the side cover 72 to form a protective chamber to enclose the filter screen inside. The cavity of the semi-enclosed structure is provided with densely distributed unblocking protrusions 44. The unblocking protrusions 44 can pierce into the filter screen to unblock it, so as to avoid a large amount of solid impurities such as slurry clogging the filter screen and causing a decrease in flowability.

[0045] To enable flushing and cleaning of the filter screen enclosed in the protective chamber while the butterfly valve is closed, thus achieving waste discharge without disassembly, refer to... Figures 3 to 5 , Figures 9 to 11 ,as well as Figure 14 The valve body 1 has a flushing channel that intersects with the medium flow channel at the cross section where the butterfly plate 4 is in the closed state; the top and bottom of the curved wall of the butterfly plate 4 are provided with flushing holes 43 that can be connected to the flushing channel; when the butterfly plate 4 is rotated to 0° when the valve is closed, the protective chamber formed by the butterfly plate 4 and the side cover 72 is connected to the flushing channel through the flushing holes 43, and the medium flow channel is closed at the same time, thereby realizing continuous backwashing of the filter screen in the protective chamber to remove solid impurities such as slurry attached to the filter screen;

[0046] The width of the flushing hole 43 along the direction of the medium flow channel can span the filter seat 71 and reach the curved wall of the side cover 72; during the valve opening process, the medium flow channel and the flushing flow channel are briefly intersected, so that the medium is automatically discharged and the slurry intercepted in front of the filter screen is carried away, realizing automatic waste discharge without disassembly and avoiding blockage of the medium flow channel.

[0047] The valve body 1 has a receiving cavity 13 coaxial with the valve stem 3 at the top of the pipe wall. The receiving cavity 13 has an inlet 11 communicating with it at the top. The other end of the inlet 11 is connected to the flushing source. The receiving cavity 13 is connected to the medium flow channel through a diversion port 14. The medium flow channel has an outlet 12 at the bottom. The inlet 11, the receiving cavity 13, the diversion port 14 and the outlet 12 constitute the flushing flow channel. The outlet 12 and the diversion port 14 are symmetrically arranged on both sides of the valve stem 3 for communicating with their respective protective chambers.

[0048] To ensure that the media flow channel and the flushing flow channel are isolated from each other after being fully opened or closed, and to ensure single-channel flow, the butterfly valve is also equipped with a flow-stopping device that is driven by the rotation of the valve stem 3 to adjust the opening and closing of the flushing flow channel. The flow-stopping device includes a drive valve plate 5 that is movable in the receiving cavity 13 and coaxially fixed to the surface of the valve stem 3. The surface of the drive valve plate 5 has a through hole. By rotating it, it is misaligned or aligned with the liquid inlet 11 and the diversion port 14 to cut off or connect the flushing source. The flow-stopping device also includes a retractable part 6 located at the bottom of the valve body 1. By rotating it synchronously, the opening and closing of the liquid outlet 12 is controlled, and the flow channel is switched in conjunction with the drive valve plate 5.

[0049] The bottom end of the valve stem 3 passes through the pipe wall of the valve body 1 and is connected to the receiving part 6. The receiving part 6 includes a drive turntable 63 fixed to the bottom end of the valve stem 3. The top of the drive turntable 63 is rotatably connected to the pipe wall of the valve body 1. An ear plate is fixed on the opposite side of the drive turntable 63. The ear plate is rotatably engaged with the ball head at one end of the connecting rod 62. The ball head at the other end of the connecting rod 62 is rotatably engaged with the gate plate 61 slidably connected to the periphery of the valve body 1. By rotating the drive turntable 63, the two gate plates 61 can be moved by pulling in opposite directions or pushing in opposite directions via the connecting rod 62 to close or open the liquid outlet 12.

[0050] The gate plate 61 is integrally formed from an arc-shaped sliding plate and a connecting seat. The arc-shaped sliding plate slides in a groove pre-set on the side wall of the valve body 1. The gate plates 61 on both sides are symmetrically arranged with the valve stem 3 as the axis. The side walls of the connecting seat extend in opposite directions to form ear seats. The ear seats are rotatably engaged with the top of the connecting rod 62, so that the connecting rod 62 can adaptively adjust its angle and apply a pushing and pulling force to the gate plate 61 when the drive turntable 63 rotates. The component of the pushing and pulling force along the circumferential direction of the valve body 1 pipe wall acts on the gate plate 61, making it move smoothly along the groove.

[0051] Working principle of this invention:

[0052] To achieve both filter protection and filtration functions, this butterfly valve is configured with two operating modes: in non-flow mode, the filter is isolated from the medium (e.g., Figures 3 to 7 As shown); in flow mode, the filter screen is placed in the media channel to filter the media (e.g. Figures 9 to 12 (As shown).

[0053] When the valve needs to be opened, the medium flow path opens, i.e., from Figure 5 Towards Figure 11 The structural transformation is as follows: The drive end of the electric actuator 2 drives the valve stem 3 to rotate in the valve opening direction (counterclockwise). The butterfly plate 4, which is centrally symmetrically arranged, gradually disengages from its adjacent filter section 7 with the valve stem 3 as the axis, and rotates circumferentially toward the other filter section 7 on the opposite side until the clearance groove 41 enters the outer circumference of the guide rail 711 and slides circumferentially along its surface. At this time, the drive groove 42 abuts against the adjusting slide plate 73 and overcomes the elastic force of the elastic device, forming a radial thrust on the adjusting slide plate 73, causing the adjusting slide plate 73 to gradually retract into the side cover 72, forcing the partition plate 731 to be misaligned with the opening 721 on the surface of the side cover 72. Finally, when the butterfly plate 4 rotates to the maximum angle of 90°, the open area of ​​the opening 721 reaches its peak, the medium flow channel is completely restored to flow, and the solid impurities such as slurry in the medium are intercepted by the filter screen of the filter seat 71, thus achieving effective filtration of the fluid medium.

[0054] At the same time, the flushing channel is closed, i.e., by Figure 4 Towards Figure 10 The structural transformation is as follows: The drive valve plate 5, which is movable in the receiving cavity 13, rotates coaxially (counterclockwise) with the valve stem 3, causing the through hole on the surface of the drive valve plate 5 to be misaligned with the inlet 11 and the diversion port 14, thereby cutting off the flushing source connected to the inlet 11; at the same time, the drive turntable 63 rotates counterclockwise synchronously with the valve stem 3, applying a pulling force to the connecting rod 62 in the circumferential direction, forcing the connecting rods 62 on both sides to pull the gate plate 61 towards each other, causing the gate plate 61 to converge along the sliding groove on the side wall of the valve body 1 towards the direction close to the central axis of the butterfly valve, until the drive turntable 63 rotates to the maximum angle of 90°, at which point the gate plate 61 completely seals the outlet 12; thereby achieving the closure of the flushing flow channel, ensuring that the subsequent fluid medium is stably transported only through the medium flow channel, and avoiding leakage;

[0055] In addition, during the valve opening process, there is an overlap between the medium flow channel and the flushing flow channel that is not fully open and closed. At this time, some of the medium is discharged through the partially closed outlet 12 to carry away the solid impurities such as slurry intercepted on the front side of the filter screen, thereby achieving automatic waste discharge and avoiding blockage of the medium flow channel. This achieves automatic waste discharge without disassembly, avoids blockage of the medium flow channel, and reduces the frequency and cost of equipment maintenance.

[0056] When the valve needs to be closed, the medium flow path is closed, i.e., by Figure 11 Towards Figure 5The structural transformation is as follows: The drive end of the electric actuator 2 drives the valve stem 3 to rotate in the valve closing direction (clockwise). The butterfly plate 4, which is centrally symmetrically arranged, gradually disengages from the other filter part 7 currently in contact with the valve stem 3 and rotates back to the original adjacent filter part 7 in a circumferential direction. At this time, the clearance groove 41 slides in the opposite direction along the outer circumference of the guide rail 711 and gradually exits. The drive groove 42 then removes the thrust on the adjusting slide plate 73, and the elastic force of the elastic device is released, pushing the adjusting slide plate 73 to return to the radial position along the side cover 72, forcing the partition plate 731 to realign with the opening 721 on the surface of the side cover 72. Finally, when the butterfly plate 4 rotates to the initial valve closing position of 0°, the opening 721 is completely closed, the medium flow channel is cut off, the medium stops flowing, the filter seat 71 exits the working state, and is sealed in the protective chamber formed by the side cover 72 and the butterfly plate 4, isolating and protecting it from contact with the medium.

[0057] At the same time, the flushing channel opens, that is, from Figure 10 Towards Figure 4 The structural transformation is as follows: The drive valve plate 5, which is movable in the receiving cavity 13, rotates in the opposite direction (clockwise) with the valve stem 3 along the same axis, so that the through hole on the surface of the drive valve plate 5 is realigned with the liquid inlet 11 and the diversion port 14, thereby connecting the flushing source connected to the liquid inlet 11; at the same time, the drive turntable 63 rotates clockwise synchronously with the valve stem 3, switching to applying circumferential thrust to the connecting rod 62, forcing the connecting rods 62 on both sides to push the gate plate 61 in the opposite direction, so that the gate plate 61 is withdrawn away from the central axis of the butterfly valve along the sliding groove on the side wall of the valve body 1, until the drive turntable 63 rotates to the initial valve closing position of 0°, and the gate plate 61 fully opens the liquid outlet 12; thereby realizing the connection between the flushing flow channel and the protection chamber, so that flushing medium can be introduced to clean the filter seat 71 inside when needed, ensuring that it is not affected by dirt or media corrosion when not in operation.

[0058] 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 technical scope disclosed in the present invention, in accordance with the technical plan and improved concept of the present invention, should be included under the protection of the present invention.

Claims

1. An adjustable split butterfly valve, comprising a valve body (1), a valve stem (3) radially penetrating a medium flow channel thereof, a butterfly plate (4) fixed to a surface of the valve stem (3) for adjusting flow, and a driving device for driving the valve stem (3) to rotate circumferentially, characterized in that: The butterfly plate (4) is arranged symmetrically on the opposite side of the valve stem (3). Its proximal end is fixed to the valve stem (3) and rotates around the central axis of the valve stem (3). On one side along the valve opening rotation direction of the butterfly plate (4), there is a filter section (7) adjacent to the other butterfly plate (4) on the opposite side. Its proximal end is movably connected to the valve stem (3). During the rotation of the butterfly plate (4) to open and close the medium flow channel, the flow regulation drive of the filter section (7) can be triggered. In the working state, the butterfly plate (4) is detached from the filter section (7) adjacent to it with the valve stem (3) as the axis and rotates circumferentially toward the other filter section (7) on the opposite side to drive the filter section (7) to filter the flowing medium. In the non-working state, the butterfly plate (4) is gradually detached from the other filter section (7) currently abutting with the valve stem (3) as the axis and rotates circumferentially toward the original adjacent filter section (7) to reset, so as to drive the filter section (7) to isolate and block the medium.

2. The adjustable split butterfly valve of claim 1, wherein: The two filter sections (7) are arranged in a centrally symmetrical manner and extend in opposite parallel directions to both sides with the central axis perpendicular to the valve stem (3) as the reference. When the butterfly plate (4) is closed and rotated to 0°, the butterfly plate (4) rotates circumferentially to the side of the originally adjacent filter section (7) until it fits against it, thereby forming two sets of opposite double-layer sealing structures, which are used to isolate the medium in the non-flow state to achieve isolation and protection of the filter screen.

3. The adjustable split butterfly valve of claim 1 or 2, wherein: The filter section (7) includes a filter seat (71) fixed in the medium flow channel. Its proximal end extends around the circumference of the valve stem (3) and is movably fitted with a guide rail (711). The curved skeleton of the filter seat (71) is sealed and fixed in the medium flow channel. A side cover (72) is fixed on the side of the butterfly plate (4) that is close to it when the valve is turned on. The side cover (72) has a semi-enclosed structure and the side close to the filter seat (71) is open to cover the filter screen. An adjusting slide plate (73) that can slide along its radial direction is provided inside the side cover (72). The adjusting slide plate (73) is pushed back by the radial force along the side cover (72) during the rotation of the butterfly plate (4) when the valve is turned on, so as to adjust the opening degree of the opening (721) on the side cover (72).

4. The adjustable split butterfly valve of claim 3, wherein: The side cover (72) has multiple openings (721) arranged radially, and the adjusting slide plate (73) has partitions (731) arranged in an array corresponding to the openings (721); the adjusting slide plate (73) is provided with a stop arm (732) at one end near the valve stem (3), and the stop arm (732) extends into the guide groove preset in the guide rail (711).

5. The adjustable split butterfly valve of claim 4, wherein: The adjusting slide (73) has a branch that extends through the side wall of the through-port (721) at one end near the valve stem (3). This branch is fixed to the stop arm (732). The stop arm (732) is a telescopic structure. One end of the stop arm is fixedly connected to the branch of the adjusting slide (73), and the other end extends into the guide groove of the guide rail (711) and is axially fixed to the limit block (733).

6. The adjustable split butterfly valve of claim 5, wherein: The butterfly plate (4) is provided with a relief groove (41) at the connection end with the valve stem (3) for the guide rail (711) to slide into when the valve is rotated; the butterfly plate (4) is provided with a drive groove (42) at one end near the relief groove (41) that matches the contour of the stop arm (732).

7. The adjustable split butterfly valve of claim 3, wherein: The butterfly plate (4) has a semi-enclosed structure. When facing the valve, it has an opening on the side of the filter part (7) that is adjacent to it. It can fit against the side of the filter seat (71) opposite the side cover (72) to form a protective chamber to enclose the filter screen inside.

8. The adjustable split butterfly valve according to claim 7, characterized in that: The valve body (1) has a flushing channel that intersects with the medium flow channel at the cross section where the butterfly plate (4) is in the closed state; the top and bottom of the curved wall of the protection chamber are provided with flushing holes (43) that can be connected to the flushing channel.

9. The adjustable split butterfly valve according to claim 8, characterized in that: The valve body (1) has a receiving cavity (13) coaxial with the valve stem (3) at the top of the pipe wall. The receiving cavity (13) has an inlet (11) communicating with it at the top. The other end of the inlet (11) is connected to the flushing source. The receiving cavity (13) is connected to the medium flow channel through a diversion port (14). The medium flow channel has an outlet (12) at the bottom. The inlet (11), receiving cavity (13), diversion port (14) and outlet (12) constitute the flushing flow channel. The outlet (12) and diversion port (14) are symmetrically arranged on both sides of the valve stem (3) for communicating with their respective protective chambers.

10. The adjustable split butterfly valve according to claim 9, characterized in that: The butterfly valve is also equipped with a flow-blocking device that adjusts the opening and closing of the flushing channel in conjunction with the rotation of the valve stem (3). The flow-blocking device includes a drive valve plate (5) that is movable in the receiving cavity (13) and coaxially fixed on the surface of the valve stem (3). The surface of the drive valve plate (5) is provided with a through hole. By rotating it, it is misaligned or aligned with the liquid inlet (11) and the diversion port (14) to cut off or connect the flushing source. The flow-blocking device also includes a retractable part (6) set at the bottom of the valve body (1). By rotating it, the opening and closing of the liquid outlet (12) is controlled, and the flow channel is switched in conjunction with the drive valve plate (5).

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