Butterfly valve

Abstract

The invention relates to the technical field of butterfly valves, and discloses a butterfly valve which comprises a valve body and a butterfly plate arranged in the valve body and further comprises a limiting convex ring fixed to the inner wall of the valve body. The valve seat is fixed in the valve body; the positioning ring is clamped on the valve body and is in butt joint with the valve seat; the reversing piece is rotationally arranged in the valve body; the function box is fixed on the valve body; the driving piece is fixed in the function box; the detection piece is fixed in the valve seat and the functional box; the flanges are fixed on two sides of the valve body; the processor is fixed at the bottom in the functional box; the steering cylinder is rotationally arranged on the valve body; the number of the steering sleeves is three; friction loss of a sealing surface can be greatly reduced in the closing process, and friction-free high-sealing closing is achieved; the sealing surface can be effectively prevented from being separated and scraped in the opening process, and the integrity of the sealing surface is protected from opening and closing bidirectionally; sealing failure can be actively prevented, automatic sealing compensation without shutdown and manual intervention is achieved, and the sealing service life and the maintenance period are remarkably prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of butterfly valves, and in particular to a butterfly valve. Background Art

[0002] Existing butterfly valves have significant technical defects in sealing performance and service life. The core problem lies in the damage to the sealing surface and subsequent water leakage caused by the relative movement of the valve seat and valve plate.

[0003] The disc and seat of a traditional butterfly valve inevitably experience direct friction during the opening and closing process. When the disc initially contacts the seat, localized friction still exists. Under high-pressure operating conditions, the seat is squeezed by the medium, further increasing the friction coefficient between the disc and the valve seat. Over time, the sealing surface is prone to physical damage such as scratches and dents, resulting in a decrease in sealing surface fit accuracy and the formation of gaps.

[0004] Existing butterfly valves lack mechanisms to prevent and mitigate sealing surface wear. Most butterfly valves feature a fixed sealing structure, and the relative position of the valve plate and seat cannot be dynamically adjusted based on wear. Once a small gap develops on the sealing surface, the medium pressure exacerbates the gap, rapidly causing leakage. Furthermore, existing butterfly valves lack integrated, effective seal status monitoring, making it difficult to detect early signs of sealing surface wear. Repairs often require downtime and disassembly, increasing maintenance costs and disrupting the normal operation of the fluid delivery system.

[0005] Although some butterfly valves use elastic seals to compensate for tiny gaps, the elastic parts are prone to aging and deformation due to long-term friction, medium corrosion or temperature changes, and their compensation ability gradually decays, making it impossible to maintain the sealing effect for a long time; and the assembly gap between the elastic seal and the valve plate and valve seat is difficult to accurately control. Assembly errors will further aggravate friction losses during the opening and closing process, shorten the service life of the sealing components, and cause frequent sealing failures in the butterfly valve, seriously affecting the reliability of the fluid delivery system. Summary of the Invention

[0006] The present invention provides a butterfly valve capable of dynamically compensating for water leakage gaps.

[0007] In order to solve the above technical problems, the technical solutions of the present invention are as follows: A butterfly valve comprises: a valve body and a butterfly plate arranged in the valve body, and further comprises: The limiting convex ring is fixed on the inner wall of the valve body; the valve seat is fixed in the valve body; the positioning ring is clamped in the valve body and is in contact with the valve seat; the reversing member is rotatably arranged in the valve body; the function box is fixed on the valve body; the driving member is fixed in the function box; the detection member is fixed in the valve seat and the function box; the flange is fixed on both sides of the valve body; the processor is fixed at the bottom of the function box; A steering cylinder is rotatably mounted on the valve body; three steering sleeves are provided, all of which are fixed to the steering cylinder; three connecting rods are provided, one end of each of the three connecting rods is slidably inserted into the steering sleeve, and the other end of each of the three connecting rods is fixed to the butterfly plate; an incomplete turbine is fixed above the steering cylinder; a transmission rod is rotatably inserted into the steering cylinder at the bottom; a transmission shaft is slidably inserted into the transmission rod at the top; an internal threaded ring is fixed in the steering cylinder; an external threaded rod is fixed to the transmission shaft and threadedly inserted into the internal threaded ring; three frustums are provided, all of which are fixed to the transmission shaft; The worm is rotatably arranged at both ends in the function box and meshes with the incomplete turbine; the auxiliary shaft is rotatably plugged into the bottom of the function box; the auxiliary turbine is fixed on the auxiliary shaft and meshes with the worm.

[0008] Furthermore, the reversing member further comprises: The first limiting ring is fixed in the steering cylinder; the second limiting ring is fixed in the steering cylinder; the limiting plate is fixed below the transmission shaft; and the pressing spring is located below the limiting plate.

[0009] Furthermore, the reversing member further comprises: An octagonal slide is provided in the steering sleeve; an octagonal slide plate is slidably arranged in the octagonal slide and fixed on the connecting rod; a limit bar is fixed in the octagonal slide; a return spring has one end fixed on the octagonal slide plate and the other end fixed in the steering sleeve; an octagonal vertical groove is provided in the transmission rod; an octagonal vertical plate is fixed above the transmission shaft and is slidably connected to the octagonal vertical groove.

[0010] Furthermore, the reversing member further comprises: The ridge groove is provided at the bottom of the function box; the ridge column is slidably inserted into the ridge groove at the bottom; the spring ring seat is fixed on the top of the ridge column; the reset torsion spring is fixed on the incomplete turbine at the top and fixed on the spring ring seat at the bottom.

[0011] Furthermore, the reversing member further comprises: The bracket is fixed on the inner wall of the function box; the stop cylinder is fixed on the bracket; the stop groove is opened on the incomplete turbine; one end of the stop clamp is slidably inserted in the stop cylinder and the other end extends into the stop groove; the solenoid valve is fixed in the stop cylinder; one end of the stop spring is fixed in the stop cylinder; the permanent magnet is fixed on the stop clamp.

[0012] Furthermore, the driving member further includes: The driving motor is fixed to the bottom of the function box; the first support plate is fixed to the bottom of the function box; the first bevel gear pair, the input end bevel gear is fixed to the driving motor, and the output end bevel gear is fixed to the worm; the second support plate is fixed to the inner wall of the function box; the linkage rod is rotatably set in the second support plate.

[0013] Furthermore, the driving member further includes: The second bevel gear pair, the input end bevel gear is fixed on the auxiliary drive shaft, and the output end bevel gear is fixed on one end of the linkage rod; the third bevel gear pair, the input end bevel gear is fixed on the other end of the linkage rod, and the output end bevel gear is fixed on the transmission rod; the driving rod is fixed on the worm; the driving handwheel is fixed on the driving rod.

[0014] Furthermore, the detection element includes: A detection groove is provided on the valve seat; a sliding plug plate is slidably arranged in the detection groove; an elastic contact is fixed on the sliding plug plate; an annular plate is slidably arranged in the detection groove; a strain gauge is fixed between the sliding plug plate and the annular plate; an elastic spring has one end fixed in the detection groove and the other end fixed on the annular plate; an encoder is fixed at the bottom of the function box and sleeved on the auxiliary drive shaft.

[0015] Furthermore, a sealing adhesive groove is provided on the sealing surface of the butterfly plate, and a sealing adhesive strip is provided in the sealing adhesive groove.

[0016] Furthermore, the processor performs the sealing water leakage detection and dynamic compensation sealing, specifically including the following steps: Step 1: Real-time acquisition of the contact pressure signal between the butterfly disc and the valve seat sealing surface transmitted by the strain gauge, and simultaneous acquisition of the initial angle data of the auxiliary shaft fed back by the encoder, to construct a real-time data set of the sealing status, and compare the real-time data set with the preset normal sealing parameters; Step 2: If the real-time data set shows that the pressure signal is below the lower limit of the standard threshold for 10 to 15 seconds, the processor determines that there is water leakage on the sealing surface and immediately triggers the dynamic compensation mechanism. The initial compensation amount is calculated based on the difference between the pressure signal and the standard threshold, and a control instruction is sent to the drive motor. The drive motor drives the worm, auxiliary turbine, and second bevel gear pair in sequence, driving the butterfly disc toward the valve seat to further push the seal. Step 3: During the compensation process, the processor updates the sealing status data set at a frequency of 100ms / time and monitors the changes in the pressure signal in real time. When the pressure signal returns to the standard threshold range within 3 seconds, the processor immediately sends a stop command to the drive motor to stop the compensation action and automatically records the angle, stroke and pressure recovery parameters of this compensation.

[0017] The above solution of the present invention includes at least the following beneficial effects: The present invention can greatly reduce the friction loss of the sealing surface during the closing process, realize frictionless and high-sealing closure, and construct a two-stage process of "rotational alignment-parallel pressure" by precisely controlling the rotation angle of the worm; in the first stage, the worm drives the incomplete turbine to rotate 90°, driving the steering cylinder, steering sleeve and connecting rod to rotate, so that the butterfly plate rotates around the transmission axis to an alignment state that is completely parallel to the valve seat, avoiding direct friction of the sealing surface when the traditional butterfly valve rotates; in the second stage, the worm synchronously drives the auxiliary turbine, and the auxiliary turbine transmission drives the drive shaft and the cone to rotate and move axially. The cone pushes the connecting rod through the inclined surface, allowing the butterfly plate to advance axially toward the valve seat while maintaining a parallel posture until the sealing surface fits, further eliminating friction and improving sealing.

[0018] The present invention can effectively avoid separation and scratching of the sealing surface during the opening process, and protect the integrity of the sealing surface from both opening and closing directions through the "reverse step-by-step disengagement" design: when opening, the worm first drives the auxiliary turbine, driving the transmission shaft and the cone to axially recover, and the cone releases the thrust on the connecting rod, so that the butterfly plate and the valve seat are disengaged in parallel axially; the encoder detects the rotation angle of the auxiliary shaft in real time, and after determining that a safety gap is formed, the solenoid valve attracts the permanent magnet to drive the stop clamp to disengage from the stop groove, and the reset torsion spring drives the incomplete turbine to contact the worm, thereby driving the butterfly plate to rotate 90° to achieve opening, and there is no scratching or damage to the sealing surface throughout the entire process.

[0019] The present invention can proactively prevent seal failure, achieve automated seal compensation without downtime or manual intervention, and significantly extend seal life and maintenance cycles through the "real-time pressure monitoring-dynamic compensation" mechanism: the elastic spring in the detection component provides a preload force, so that the elastic contact always abuts against the sealing surface of the butterfly plate, and the strain gauge captures the slight attenuation of the abutment pressure in real time to identify the risk of failure; when the processor determines that the pressure is abnormal, it starts the drive motor to drive the worm to rotate precisely, and drives the butterfly plate axially further toward the valve seat in parallel through the auxiliary turbine, transmission shaft, cone and connecting rod linkage, and compensates for the wear gap of the sealing surface through small stroke regulation, restores the effective fitting pressure, thereby achieving sealing and preventing water leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the overall structure of a butterfly valve provided by an embodiment of the present invention; Figure 2 A sectional view of a butterfly valve body provided by an embodiment of the present invention; Figure 3 A butterfly valve provided by an embodiment of the present invention Figure 2 A magnified view of point A; Figure 4 A butterfly valve provided by an embodiment of the present invention Figure 2 Enlarged view of point B; Figure 5 A butterfly valve provided by an embodiment of the present invention Figure 2Enlarged view of point C; Figure 6 A butterfly valve provided by an embodiment of the present invention Figure 2 Enlarged view of point D; Figure 7 A schematic diagram of a worm structure of a butterfly valve provided in an embodiment of the present invention; Figure 8 A schematic diagram of an incomplete turbine structure of a butterfly valve provided by an embodiment of the present invention; Figure 9 A butterfly valve provided by an embodiment of the present invention Figure 8 Enlarged view of point E; Figure 10 A flowchart of sealing leakage detection and dynamic compensation sealing of a butterfly valve provided in an embodiment of the present invention.

[0021] Description of reference numerals: Figure: 1, valve body; 2, butterfly plate; 201, sealant groove; 202, sealant strip; 3, limit convex ring; 4, valve seat; 5, positioning ring; 6, reversing member; 601, steering cylinder; 602, steering sleeve; 603, connecting rod; 604, incomplete turbine; 605, transmission rod; 606, transmission shaft; 607, internal thread ring; 608, external thread rod; 609, cone; 601 0, first limiting ring; 6011, second limiting ring; 6012, limiting plate; 6013, downward pressure spring; 6014, octagonal slide; 6015, octagonal slide; 6016, limiting bar; 6017, return spring; 6018, octagonal vertical groove; 6019, octagonal vertical plate; 6020, edge groove; 6021, edge column; 6022, spring ring seat; 6023, return torsion spring ;6024, bracket;6025, stop cylinder;6026, stop groove;6027, stop clamp;6028, solenoid valve;6029, stop spring;6030, permanent magnet;7, function box;8, driving part;801, worm;802, auxiliary drive shaft;803, auxiliary drive turbine;804, driving motor;805, first support plate;806, first bevel gear pair;807, second support plate;808, linkage rod;809, second bevel gear pair;8010, third bevel gear pair;8011, driving rod;8012, driving handwheel;9, detection part;901, detection groove;902, sliding plug plate;903, elastic contact;904, annular plate;905, strain gauge;906, elastic spring;907, encoder;10, flange;11, processor. DETAILED DESCRIPTION

[0022] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0023] like Figures 1 to 9 As shown, an embodiment of the present invention provides a butterfly valve, comprising: a valve body 1 and a butterfly plate 2 arranged in the valve body 1, and also comprising: a limiting convex ring 3, fixed on the inner wall of the valve body 1; a valve seat 4, fixed in the valve body 1; a positioning ring 5, clamped in the valve body 1, and connected to the valve seat 4; a reversing member 6, rotatably arranged in the valve body 1; a function box 7, fixed on the valve body 1; a driving member 8, fixed in the function box 7; a detection member 9, fixed in the valve seat 4 and the function box 7; a flange 10, fixed on both sides of the valve body 1; a processor 11, fixed at the bottom of the function box 7; a sealing rubber groove 201 is provided on the sealing surface of the butterfly plate 2, and a sealing rubber strip 202 is provided in the sealing rubber groove 201.

[0024] The steering cylinder 601 is rotatably mounted on the valve body 1; there are three steering sleeves 602, all of which are fixed to the steering cylinder 601; there are three connecting rods 603, one end of which is slidably inserted into the steering sleeve 602, and the other end of which is fixed to the butterfly plate 2; the incomplete turbine 604 is fixed above the steering cylinder 601; the transmission rod 605 is rotatably inserted into the steering cylinder 601 at the bottom; the transmission shaft 606 is slidably inserted into the transmission rod 60 5; an internal threaded ring 607, fixed in the steering cylinder 601; an external threaded rod 608, fixed on the drive shaft 606, and threadedly inserted in the internal threaded ring 607; three frustums 609 are provided, and the three frustums 609 are fixed on the drive shaft 606; a worm 801, both ends of which are rotatably arranged in the function box 7 and meshed with the incomplete turbine 604; an auxiliary drive shaft 802, which is rotatably inserted at the bottom of the function box 7; an auxiliary turbine 803, fixed on the auxiliary drive shaft 802, and meshed with the worm 801.

[0025] Specifically, the valve seat 4 and the positioning ring 5 are fixed together by bolts; the processor 11 mainly handles the sealing leakage between the butterfly plate 2 and the valve seat 4; the teeth of the incomplete turbine 604 can support 90° rotation; the inclined surface of the cone 609 is used to promote the movement of the connecting rod 603 to achieve sealing, and the cone 609 must leave a margin while achieving sealing to facilitate sealing compensation after leakage; the incomplete turbine 604 and the auxiliary turbine 803 are located on both sides of the worm 801.

[0026] As a preferred embodiment of the present invention, the reversing member 6 also includes: a first limiting ring 6010, fixed in the steering cylinder 601; a second limiting ring 6011, fixed in the steering cylinder 601; a limiting plate 6012, fixed below the transmission shaft 606; and a downward pressure spring 6013, located below the limiting plate 6012.

[0027] The reversing member 6 also includes: an octagonal slide 6014, which is provided in the steering sleeve 602; an octagonal slide 6015, which is slidably arranged in the octagonal slide 6014 and fixed on the connecting rod 603; a limit bar 6016, which is fixed in the octagonal slide 6014; a return spring 6017, one end of which is fixed on the octagonal slide 6015 and the other end is fixed in the steering sleeve 602; an octagonal vertical groove 6018, which is provided in the transmission rod 605; and an octagonal vertical plate 6019, which is fixed above the transmission shaft 606 and is slidably connected to the octagonal vertical groove 6018.

[0028] The reversing member 6 also includes: a ridge groove 6020, which is opened at the bottom of the function box 7; a ridge column 6021, which is slidably inserted into the ridge groove 6020 at the bottom; a spring ring seat 6022, which is fixed above the ridge column 6021; and a reset torsion spring 6023, which is fixed on the incomplete turbine 604 at the top and fixed on the spring ring seat 6022 at the bottom.

[0029] The reversing member 6 also includes: a bracket 6024, fixed on the inner wall of the function box 7; a stop cylinder 6025, fixed on the bracket 6024; a stop groove 6026, opened on the incomplete turbine 604; a stop clamp 6027, one end of which is slidably inserted into the stop cylinder 6025 and the other end extends into the stop groove 6026; an electromagnetic valve 6028, fixed in the stop cylinder 6025; a stop spring 6029, one end of which is fixed in the stop cylinder 6025; and a permanent magnet 6030, fixed on the stop clamp 6027.

[0030] Specifically, the downward pressure spring 6013 is used to elastically support the transmission shaft 606. There is no connection between the downward pressure spring 6013 and the transmission shaft 606. The limit plate 6012 is located in the first limit ring 6010 and the second limit ring 6011, and is used to limit the range of movement of the limit plate 6012.

[0031] As a preferred embodiment of the present invention, the driving member 8 also includes: a driving motor 804, fixed to the bottom of the function box 7; a first support plate 805, fixed to the bottom of the function box 7; a first bevel gear pair 806, the input end bevel gear is fixed on the driving motor 804, and the output end bevel gear is fixed on the worm 801; a second support plate 807, fixed on the inner wall of the function box 7; and a linkage rod 808, which is rotatably arranged in the second support plate 807.

[0032] The driving member 8 also includes: a second bevel gear pair 809, the input end bevel gear is fixed on the auxiliary drive shaft 802, and the output end bevel gear is fixed on one end of the linkage rod 808; a third bevel gear pair 8010, the input end bevel gear is fixed on the other end of the linkage rod 808, and the output end bevel gear is fixed on the transmission rod 605; a driving rod 8011, fixed on the worm 801; and a driving handwheel 8012, fixed on the driving rod 8011.

[0033] Specifically, the opening and closing of the butterfly plate 2 in the valve body 1 has both manual and automatic control modes: the staff can manually turn the driving hand wheel 8012 to directly control the opening and closing; or send instructions through the processor 11 to control the driving motor 804 to achieve opening and closing.

[0034] When water leakage occurs between the butterfly plate 2 and the valve seat 4, the processor 11 will trigger an alarm. At this time, it can be handled in two ways: one is manual intervention, manually turning the drive handwheel 8012 to adjust until the alarm is lifted; the other is automatic compensation, in which the processor 11 controls the drive motor 804 to complete the leakage adjustment compensation.

[0035] As a preferred embodiment of the present invention, the detection member 9 includes: a detection groove 901, which is opened on the valve seat 4; a sliding plug plate 902, which is slidably set in the detection groove 901; an elastic contact 903, which is fixed on the sliding plug plate 902; an annular plate 904, which is slidably set in the detection groove 901; a strain gauge 905, which is fixed between the sliding plug plate 902 and the annular plate 904; an elastic spring 906, one end of which is fixed in the detection groove 901 and the other end is fixed on the annular plate 904; an encoder 907, which is fixed at the bottom of the function box 7 and is sleeved on the auxiliary drive shaft 802.

[0036] Specifically, the encoder 907 is used to detect the number of revolutions and angles of the auxiliary drive shaft 802 ; the strain gauge 905 is used to detect the magnitude of the force exerted by the sealing surface of the butterfly plate 2 on the elastic contact 903 .

[0037] Working principle: Connect the flange 10 of the butterfly valve to the transportation pipeline. The butterfly valve has two driving modes: manual and automatic. When manually driven, directly rotate the driving handwheel 8012, and the driving handwheel 8012 drives the worm 801 to rotate; when automatically driven, start the driving motor 804, and the rotation of the driving motor 804 drives the first bevel gear pair 806 to rotate, and the output end bevel gear of the first bevel gear pair 806 drives the worm 801 to rotate; by controlling the forward or reverse rotation of the worm 801, the opening and closing action of the butterfly valve can be realized. When the butterfly valve enters the closed state, the worm 801 rotates forward, the worm 801 meshes with the incomplete turbine 604 and drives the incomplete turbine 604 to rotate 90 degrees. After rotating 90 degrees, the incomplete turbine 604 is out of meshing contact with the worm 801. During the rotation of the incomplete turbine 604, the reset torsion spring 6023 is twisted, so that the reset torsion spring 6023 is tightened, and the ridge column 6021 and the spring ring seat 6022 move upward along the ridge groove 6020 to adapt to the tightening state of the reset torsion spring 6023. During the rotation of the incomplete turbine 604 by 90 degrees, the stop clamp 60 27 slides along the outer surface of the incomplete turbine 604. When the incomplete turbine 604 rotates to the 90° position, the stop spring 6029 elastically pushes the stop clamp 6027 into the stop groove 6026, thereby limiting the rotation of the incomplete turbine 604. When the incomplete turbine 604 rotates 90°, it synchronously drives the steering cylinder 601 to rotate, and the steering cylinder 601 drives the three steering sleeves 602 to swing 90°. Each steering sleeve 602 drives the corresponding connecting rod 603 to swing, and the three connecting rods 603 jointly drive the butterfly plate 2 to swing to a state where it remains parallel to the valve seat 4. When the worm 801 rotates forward, it also drives the auxiliary turbine 803 to rotate, the auxiliary turbine 803 drives the auxiliary shaft 802 to rotate, the auxiliary shaft 802 drives the second bevel gear pair 809 to rotate, the output end bevel gear of the second bevel gear pair 809 drives the linkage rod 808 to rotate, the linkage rod 808 drives the third bevel gear pair 8010 to rotate, the output end bevel gear of the third bevel gear pair 8010 drives the transmission rod 605 to rotate, the transmission rod 605 drives the transmission shaft 606 to rotate; when the transmission shaft 606 rotates, the external threaded rod 608 moves downward along the internal threaded ring 607, and the transmission shaft The octagonal vertical plate 6019 above 606 slides downward along the octagonal vertical groove 6018 in the transmission rod 605 to cooperate with the spiral transmission of the external threaded rod 608 and the internal threaded ring 607; the transmission shaft 606 drives the three cones 609 to rotate synchronously and move downward, and the cone 609 pushes the connecting rod 603 to extend outside the steering sleeve 602 through the inclined surface. The limit plate 6012 below the transmission shaft 606 slides along the octagonal slide groove 6014, and the octagonal slide 6015 compresses the return spring 6017. Finally, the three connecting rods 603 jointly drive the butterfly plate 2 to move toward the valve seat 4 to achieve closing. During the process of the butterfly plate 2 moving toward the valve seat 4 to close, the sealing surface of the butterfly plate 2 contacts the elastic contact 903 and pushes the sliding plug plate 902 to slide along the detection groove 901; the force exerted on the elastic contact 903 is transmitted to the sliding plug plate 902, and the sliding plug plate 902 applies the force to the strain gauge 905, and the strain gauge 905 transmits the force to the annular plate 904, and the annular plate 904 compresses the elastic spring 906; until the sealing surface of the butterfly plate 2 fully contacts the sealing surface of the valve seat 4, forming an effective seal. When the butterfly valve enters the open state, the worm 801 reverses, and the worm 801 first drives the auxiliary turbine 803 to rotate. At this time, the incomplete turbine 604 is not engaged with the worm 801; the auxiliary turbine 803 drives the auxiliary shaft 802 to rotate, and the auxiliary shaft 802 drives the second bevel gear pair 809 to rotate, and the second bevel gear pair 809 drives the linkage rod 808 to rotate, and the linkage rod 808 drives the third bevel gear pair 8010 to rotate, and the third bevel gear pair 8010 drives the transmission rod 605 to rotate, and the transmission The movable rod 605 drives the transmission shaft 606 and the externally threaded rod 608 to rotate; the externally threaded rod 608 is threadedly matched with the internally threaded ring 607, driving the transmission shaft 606 and the three frustums 609 to move spirally upward; the frustum 609 no longer presses against the connecting rod 603, the return spring 6017 is reset and drives the octagonal slide 6015 and the connecting rod 603 to retract into the steering sleeve 602, and the connecting rod 603 drives the butterfly plate 2 to separate from the valve seat 4, so that the butterfly plate 2 and the valve seat 4 are kept spaced apart and parallel; The encoder 907 is fixedly sleeved on the auxiliary drive shaft 802, and the rotation angle of the auxiliary drive shaft 802 is detected by the encoder 907, thereby determining the remaining rotation angle of the worm 801; when the remaining rotation angle is 90 degrees, the solenoid valve 6028 is activated, and the solenoid valve 6028 generates a magnetic force to attract the permanent magnet 6030, and the permanent magnet 6030 drives the stop clamp 6027 to retract into the stop cylinder 6025, and the stop clamp 6027 is disengaged from the stop groove 6026, no longer restricting the incomplete turbine 60 4 rotation; under the torsional reset action of the reset torsion spring 6023, the incomplete turbine 604 is re-mounted on the worm 801, and the worm 801 reverses and drives the incomplete turbine 604 to rotate 90 °. After the rotation, part of the teeth of the incomplete turbine 604 remains on the worm 801, waiting for the next start; when the incomplete turbine 604 rotates 90 °, it drives the steering cylinder 601, the steering sleeve 602, the connecting rod 603 and the butterfly plate 2 to rotate synchronously 90 °, and the butterfly valve reaches the open state.

[0038] The butterfly valve precisely controls the rotation angle of the worm 801 to construct a two-stage precise control process of "rotational alignment - parallel pressure", thereby achieving step-by-step regulation of the closing state of the butterfly plate 2: in the first stage, the butterfly plate 2 is first rotated 90° around the transmission axis and precisely adjusted to an alignment state that is completely parallel to the valve seat 4, avoiding friction loss on the sealing surface during the rotation of the traditional butterfly valve; in the second stage, while maintaining a parallel posture, the butterfly plate 2 is advanced parallel to the axial direction, gradually approaching the valve seat 4 until the sealing surface is completely fitted, forming a frictionless and highly sealing closing effect.

[0039] The butterfly valve opening process adopts a "reverse step-by-step disengagement" design: first, axial drive is used to keep the butterfly plate 2 and the valve seat 4 in a parallel posture and smoothly disengage, eliminating scratches and damage when the sealing surface separates; after a safe gap is formed between the butterfly plate 2 and the valve seat 4, the butterfly plate 2 is driven to rotate 90° to achieve full opening of the flow channel, protecting the integrity of the sealing surface from both opening and closing directions.

[0040] In order to solve the sealing failure problem that is prone to occur in butterfly valves during long-term use, this design breaks through the traditional passive maintenance mode and integrates an active protection mechanism of "real-time pressure monitoring-dynamic compensation": when the sealing surfaces of the butterfly plate 2 and the valve seat 4 produce internal leakage due to wear and deformation, resulting in a decrease in the fitting pressure between the two or an increase in the sealing gap, the elastic contact 903 in the detection component 9 always maintains contact with the sealing surface of the butterfly plate 2 under the pre-tightening force of the elastic spring 906. At this time, the strain gauge 905 can capture the tiny attenuation changes of the abutment pressure in real time, and identify the risk of sealing failure at the first time.

[0041] When abnormal pressure is detected, the system immediately triggers the adaptive dynamic compensation sealing mechanism: the drive motor 804 is started, and the worm 801 is driven by the drive motor 804 to rotate precisely, thereby driving the butterfly plate 2 to advance further axially parallel to the valve seat 4. Through precise regulation of small strokes, the gap caused by wear on the sealing surface is compensated, and the effective fitting pressure between the butterfly plate 2 and the valve seat 4 is restored, realizing automatic sealing compensation without the need for shutdown and manual intervention, significantly extending the sealing life and maintenance cycle of the butterfly valve.

[0042] like Figure 10 As shown, a butterfly valve, the processor 11 is used to perform seal leakage detection and dynamic compensation, specifically including the following steps: Step 1: Real-time acquisition of the contact pressure signal between the butterfly disc 2 and the valve seat 4 sealing surface transmitted by the strain gauge 905, and simultaneous acquisition of the initial angle data of the auxiliary drive shaft 802 fed back by the encoder 907, to construct a real-time data set of the sealing status, and compare the real-time data set with the preset normal sealing parameters; Step 2: If the real-time data set shows that the pressure signal is below the lower limit of the standard threshold for 10 to 15 seconds continuously, the processor 11 determines that there is water leakage on the sealing surface and immediately triggers the dynamic compensation mechanism. The processor 11 calculates the initial compensation amount based on the difference between the pressure signal and the standard threshold, and sends a control instruction to the drive motor 804. The drive motor 804 drives the worm 801, the auxiliary turbine 803, and the second bevel gear pair 809 in sequence, driving the butterfly plate 2 to further advance the seal toward the valve seat 4. Step 3: During the compensation process, the processor 11 updates the sealing status data set at a frequency of 100ms / time and monitors the changes in the pressure signal in real time; when the pressure signal returns to the standard threshold range within 3 seconds, the processor 11 immediately sends a stop command to the drive motor 804 to stop the compensation action, and automatically records the angle, stroke and pressure recovery parameters of this compensation.

[0043] In Example 1, when the butterfly valve is conveying a clean water medium with a pressure of 1.0 MPa, the processor 11 continuously executes the sealing leakage detection and dynamic compensation process: the processor 11 collects the sealing surface contact pressure signal of the butterfly plate 2 and the valve seat 4 transmitted by the strain gauge 905 in the detection component 9 in real time (sampling frequency 50 Hz), and synchronously obtains the initial angle data of the auxiliary shaft 802 fed back by the encoder 907 (the initial angle is 18.0°), thereby constructing a real-time data set of the sealing status, and comparing it with the preset normal sealing parameters (standard pressure threshold range 0.8-1.2 MPa, auxiliary shaft angle deviation allowable range ±0.5°).

[0044] When the real-time data set shows that the sealing surface contact pressure signal continuously decays from 0.95MPa to 0.72MPa, and the low pressure state is maintained for 12 seconds (within the judgment interval of 10 to 15 seconds), the processor 11 immediately determines that the sealing surface is leaking due to slight wear of the sealing strip 202, and triggers the dynamic compensation mechanism; based on the difference (0.08MPa) between the pressure signal and the lower limit of the standard threshold (0.8MPa), the processor 11 calculates the initial compensation amount of 0.12mm for the butterfly plate 2 to advance the stroke, and then sends a signal to the drive motor 804 (rated output speed 150r / min, minus 0.8MPa) of the drive member 8. After the drive motor 804 is started, power is transmitted to the worm 801 (lead 5mm) via the first bevel gear pair 806. The meshing of the worm 801 drives the auxiliary turbine 803 (number of teeth 40) and the auxiliary shaft 802 to rotate. The power is then transmitted in sequence through the second bevel gear pair 809, the linkage rod 808, and the third bevel gear pair 8010 (all with a transmission ratio of 1:1), driving the transmission rod 605 and the transmission shaft 606 to rotate synchronously. The externally threaded rod 608 on the transmission shaft 606 cooperates with the internally threaded ring 607 (pitch 2mm) to convert rotational motion into axial movement. Ultimately, the connecting rod 603 is pushed through the three cones 609 (bevel angle 15°), causing the butterfly plate 2 to accurately advance 0.12mm toward the valve seat 4 to enhance the seal.

[0045] During the compensation process, the processor 11 updates the sealing status data set at a frequency of 100ms / time and monitors the changes in the pressure signal in real time: 0.8 seconds after the compensation starts, the pressure rises to 0.78MPa; 1.8 seconds after the pressure reaches 0.8MPa (the lower limit of the standard threshold); 2.5 seconds after the pressure stabilizes at 0.85MPa (within the standard threshold range). At this time, only 2.5 seconds after the compensation starts (less than the 3-second judgment threshold), the processor 11 immediately sends a stop command to the drive motor 804 to terminate the compensation action and automatically records the compensation parameters of this time - auxiliary drive shaft 802 The final angle is 18.9° (accumulated rotation of 0.9°, matching the transmission: 36° rotation of the worm → 36° ÷ (360° / 40) = 0.9° rotation of the auxiliary drive shaft, corresponding to 0.1 turn rotation of the drive shaft → advancement of 0.1 × 2mm = 0.2mm, actual advancement after conversion through the frustum slope is 0.12mm, with an error of ±0.01mm). The pressure recovery curve (the average rate of recovery from 0.72MPa to 0.85MPa is 0.052MPa / s) completes a sealing compensation closed-loop control. The entire process does not require shutdown and the medium transportation is not affected.

[0046] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A butterfly valve, comprising: The valve body and the butterfly plate arranged in the valve body are characterized by further comprising: The limiting convex ring is fixed on the inner wall of the valve body; the valve seat is fixed in the valve body; the positioning ring is clamped in the valve body and is in contact with the valve seat; the reversing member is rotatably arranged in the valve body; the function box is fixed on the valve body; the driving member is fixed in the function box; the detection member is fixed in the valve seat and the function box; the flange is fixed on both sides of the valve body; the processor is fixed at the bottom of the function box; A steering cylinder is rotatably mounted on the valve body; three steering sleeves are provided, all of which are fixed to the steering cylinder; three connecting rods are provided, one end of each of the three connecting rods is slidably inserted into the steering sleeve, and the other end of each of the three connecting rods is fixed to the butterfly plate; an incomplete turbine is fixed above the steering cylinder; a transmission rod is rotatably inserted into the steering cylinder at the bottom; a transmission shaft is slidably inserted into the transmission rod at the top; an internal threaded ring is fixed in the steering cylinder; an external threaded rod is fixed to the transmission shaft and threadedly inserted into the internal threaded ring; three frustums are provided, all of which are fixed to the transmission shaft; The worm is rotatably arranged at both ends in the function box and meshes with the incomplete turbine; the auxiliary shaft is rotatably plugged into the bottom of the function box; the auxiliary turbine is fixed on the auxiliary shaft and meshes with the worm.

2. A butterfly valve according to claim 1, characterized in that: The reversing member further comprises: The first limiting ring is fixed in the steering cylinder; the second limiting ring is fixed in the steering cylinder; the limiting plate is fixed below the transmission shaft; and the pressing spring is located below the limiting plate.

3. A butterfly valve according to claim 2, characterized in that: The reversing member further comprises: An octagonal slide is provided in the steering sleeve; an octagonal slide plate is slidably arranged in the octagonal slide and fixed on the connecting rod; a limit bar is fixed in the octagonal slide; a return spring has one end fixed on the octagonal slide plate and the other end fixed in the steering sleeve; an octagonal vertical groove is provided in the transmission rod; an octagonal vertical plate is fixed above the transmission shaft and is slidably connected to the octagonal vertical groove.

4. A butterfly valve according to claim 3, characterized in that: The reversing member further comprises: The ridge groove is provided at the bottom of the function box; the ridge column is slidably inserted into the ridge groove at the bottom; the spring ring seat is fixed on the top of the ridge column; the reset torsion spring is fixed on the incomplete turbine at the top and fixed on the spring ring seat at the bottom.

5. A butterfly valve according to claim 4, characterized in that: The reversing member further comprises: The bracket is fixed on the inner wall of the function box; the stop cylinder is fixed on the bracket; the stop groove is opened on the incomplete turbine; one end of the stop clamp is slidably inserted in the stop cylinder and the other end extends into the stop groove; the solenoid valve is fixed in the stop cylinder; one end of the stop spring is fixed in the stop cylinder; the permanent magnet is fixed on the stop clamp.

6. The butterfly valve according to claim 1, characterized in that: The driving member further comprises: The driving motor is fixed to the bottom of the function box; the first support plate is fixed to the bottom of the function box; the first bevel gear pair, the input end bevel gear is fixed to the driving motor, and the output end bevel gear is fixed to the worm; the second support plate is fixed to the inner wall of the function box; the linkage rod is rotatably set in the second support plate.

7. A butterfly valve according to claim 6, characterized in that: The driving member further comprises: The second bevel gear pair, the input end bevel gear is fixed on the auxiliary drive shaft, and the output end bevel gear is fixed on one end of the linkage rod; the third bevel gear pair, the input end bevel gear is fixed on the other end of the linkage rod, and the output end bevel gear is fixed on the transmission rod; the driving rod is fixed on the worm; the driving handwheel is fixed on the driving rod.

8. The butterfly valve according to claim 1, characterized in that: The detection part includes: A detection groove is provided on the valve seat; a sliding plug plate is slidably arranged in the detection groove; an elastic contact is fixed on the sliding plug plate; an annular plate is slidably arranged in the detection groove; a strain gauge is fixed between the sliding plug plate and the annular plate; an elastic spring has one end fixed in the detection groove and the other end fixed on the annular plate; an encoder is fixed at the bottom of the function box and sleeved on the auxiliary drive shaft.

9. The butterfly valve according to claim 1, characterized in that: A sealing rubber groove is provided on the sealing surface of the butterfly plate, and a sealing rubber strip is provided on the sealing rubber groove.

10. The butterfly valve according to claim 1, characterized in that: The processor performs seal leakage detection and dynamic compensation seal, specifically including the following steps: Step 1: Real-time acquisition of the contact pressure signal between the butterfly disc and the valve seat sealing surface transmitted by the strain gauge, and simultaneous acquisition of the initial angle data of the auxiliary shaft fed back by the encoder, to construct a real-time data set of the sealing status, and compare the real-time data set with the preset normal sealing parameters; Step 2: If the real-time data set shows that the pressure signal is below the lower limit of the standard threshold for 10 to 15 seconds, the processor determines that there is water leakage on the sealing surface and immediately triggers the dynamic compensation mechanism. The initial compensation amount is calculated based on the difference between the pressure signal and the standard threshold, and a control instruction is sent to the drive motor. The drive motor drives the worm, auxiliary turbine, and second bevel gear pair in sequence, driving the butterfly disc toward the valve seat to further push the seal. Step 3: During the compensation process, the processor updates the sealing status data set at a frequency of 100ms / time and monitors the changes in the pressure signal in real time. When the pressure signal returns to the standard threshold range within 3 seconds, the processor immediately sends a stop command to the drive motor to stop the compensation action and automatically records the angle, stroke and pressure recovery parameters of this compensation.

Images