Anti-corrosion butterfly valve of self-repairing sealing structure

Abstract

The invention provides an anti-corrosion butterfly valve of a self-repairing sealing structure, and relates to the technical field of butterfly valves, the anti-corrosion butterfly valve comprises two mounting flanges, and the two mounting flanges are both fixedly connected to the outer side of a butterfly valve body; the two groups of mounting bolt holes are respectively formed in the inner sides of the two mounting flanges; the mounting support is fixedly mounted on the upper end face of the butterfly valve body through bolts. The transmission box is fixedly mounted on the upper end face of the mounting support through bolts. The transmission connection cylinder is fixedly connected to the outer side of the transmission box; the valve rod transmission shaft center is rotationally connected to the inner side of the butterfly valve body, and the problems that in the using process of an existing anti-corrosion butterfly valve, if cracks are generated due to abrasion or scratching of a sealing ring, a gap is easily formed between a disc type valve clack of the butterfly valve and the sealing ring, normal work of the valve is affected, and the service life of the valve is shortened are solved. The sealing performance of the butterfly valve is guaranteed, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of butterfly valves, in particular to an anti-corrosion butterfly valve with self-repairing sealing structure. BACKGROUND

[0002] The butterfly valve, also known as a flap valve, is a simple structure and convenient operation regulating valve, which is widely used in low-pressure pipelines to control the opening and closing of the medium. The closing part (i.e. the butterfly valve disc or butterfly plate) is a circular disc, which rotates around the valve stem drive shaft to open and close the valve. The butterfly valve can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal, and radioactive media in the pipeline. In the system, it mainly plays the role of cutting off and throttling. For working conditions with strong corrosive properties, such as acid, alkali, salt solution, seawater, and chemical liquid media, an anti-corrosion butterfly valve is specially designed. The anti-corrosion butterfly valve improves its corrosion resistance and service life in harsh medium environments by optimizing material selection, sealing structure design, and using advanced surface treatment technology, thereby ensuring safe and reliable operation in complex working conditions.

[0003] According to the application number: CN200510060404.0, a titanium butterfly valve resistant to strong oxidative corrosion is disclosed, which includes a valve body and a valve stem, a butterfly plate connected to the valve stem by a fastener, and a dynamic sealing cooperation in the valve body cavity. The outer end of the valve stem is connected to a valve control device. The valve body is made of ZTA2 or TA2 titanium material. The valve stem is made of TC4 or TA2 titanium material. The butterfly plate is made of ZTA2 or TA2 titanium material. The fastener is made of TC4 or TA2 titanium material. The sealing pair between the butterfly plate and the valve body is composed of a soft and hard multi-layer sealing pair in a laminated manner using non-metallic corrosion-resistant material and TC4 or TA2 titanium material, or a hard sealing pair composed of a titanium spring ring. In the butterfly valve of the present application, all parts in contact with strong oxidative corrosive media are made of titanium material, which has good corrosion resistance and can resist strong oxidative corrosive media. The service life is very long, generally does not need to be replaced, does not affect continuous production, and is safe and reliable.

[0004] However, in the use process of the existing anti-corrosion butterfly valve, if the sealing ring is cracked due to wear or scratches, it is easy to form a gap between the butterfly valve disc and the sealing ring, thereby affecting the sealing performance and causing medium leakage, which not only affects the normal operation of the valve, but also shortens the service life of the valve. SUMMARY

[0005] Therefore, the present application provides an anti-corrosion butterfly valve with self-repairing sealing structure, which has the advantages of improving sealing performance, prolonging service life, and reducing use cost.

[0006] The application provides an anti-corrosion butterfly valve with a self-repairing sealing structure, which specifically comprises a butterfly valve body, mounting flanges, mounting bolt holes, mounting supports, a transmission box, a transmission connecting cylinder, a valve rod transmission shaft, a butterfly valve disc valve, a connecting rotating shaft, an operating hand wheel, a sealing mechanism and an adjusting mechanism; the mounting flanges are provided in two, and both of the mounting flanges are fixedly connected to the outer side of the butterfly valve body; the mounting bolt holes are provided in two groups, and the two groups of mounting bolt holes are respectively arranged on the inner side of the two mounting flanges; the mounting support is fixedly installed on the upper end surface of the butterfly valve body through bolts; the transmission box is fixedly installed on the upper end surface of the mounting support through bolts; the transmission connecting cylinder is fixedly connected to the outer side of the transmission box; the valve rod transmission shaft is rotatably connected to the inner side of the butterfly valve body; the butterfly valve disc valve is fixedly connected to the outer side of the valve rod transmission shaft; the connecting rotating shaft is rotatably connected to the inner side of the transmission connecting cylinder; the operating hand wheel is fixedly connected to the outer side of the connecting rotating shaft; the sealing mechanism is arranged on the inner side of the butterfly valve body; and the adjusting mechanism is arranged on the inner side of the transmission box.

[0007] Further, the sealing mechanism comprises a leakage-proof sealing washer, the leakage-proof sealing washer is installed on the inner side of the butterfly valve body, a large number of cavities are arranged in the leakage-proof sealing washer, and polyurethane repair agents are arranged in the cavities.

[0008] Further, the sealing mechanism further comprises an axial pressure compensation ring and an extrusion compression spring, the axial pressure compensation ring is provided in two, both of the axial pressure compensation rings are slidably connected to the inner side of the butterfly valve body, the axial pressure compensation ring is made of metal and has a circular ring shape, and the extrusion compression spring is provided in two groups, one end of each of the two groups of extrusion compression springs is fixedly connected to the outer side of the two axial pressure compensation rings, and the other end of each of the two groups of extrusion compression springs is fixedly connected to the inner side of the butterfly valve body.

[0009] Further, the adjusting mechanism comprises an arc-shaped limiting guide groove, a fixed bottom plate and a fixed limiting protrusion, the arc-shaped limiting guide groove is arranged on the lower end surface of the butterfly valve body, the fixed bottom plate is fixedly connected to the lower end surface of the valve rod transmission shaft and rotatably connected to the lower end of the butterfly valve body, and the fixed limiting protrusion is fixedly connected to the upper end surface of the fixed bottom plate and slidably connected to the inner side of the arc-shaped limiting guide groove.

[0010] Further, the adjusting mechanism further comprises angle indication scale lines, a connecting fixed shaft and an opening indication dial, the angle indication scale lines are provided in multiple, and each of the multiple angle indication scale lines is arranged on the upper end surface of the transmission box, the connecting fixed shaft is fixedly connected to the upper end surface of the valve rod transmission shaft and rotatably connected to the inner side of the transmission box, and the opening indication dial is fixedly connected to the upper end surface of the connecting fixed shaft and rotatably connected to the upper end surface of the transmission box.

[0011] Further, the adjusting mechanism further comprises: a connecting worm wheel and a driving worm; the connecting worm wheel is fixedly connected to the upper end surface of the valve rod transmission shaft, and the connecting worm wheel is rotatably connected to the inner side of the transmission box; the driving worm is fixedly connected to the outer side of the connecting rotating shaft, and the driving worm is rotatably connected to the inner side of the transmission adapter cylinder; and the driving worm is engaged with the connecting worm wheel.

[0012] Further, the adjusting mechanism further comprises: a fixed limiting support and a locking positioning hole; the fixed limiting support is fixedly connected to the outer side of the driving worm, the fixed limiting support is circular, and the fixed limiting support is rotatably connected to the inner side of the transmission adapter cylinder; and the locking positioning hole is provided with a plurality of locking positioning holes, and the plurality of locking positioning holes are all arranged on the inner side of the fixed limiting support.

[0013] Further, the adjusting mechanism further comprises: an adjusting limiting knob and a fixed gear ring; the adjusting limiting knob is rotatably connected to the outer side of the transmission adapter cylinder; and the fixed gear ring is fixedly connected to the inner side of the adjusting limiting knob.

[0014] Further, the adjusting mechanism further comprises: a connecting gear and a fixed sliding rod; the connecting gear is slidably connected to the inner side of the transmission adapter cylinder, and the connecting gear is engaged with the adjusting limiting knob; and the fixed sliding rod is fixedly connected to the outer side of the connecting gear, and the fixed sliding rod is slidably connected to the inner side of the adjusting limiting knob.

[0015] Further, the adjusting mechanism further comprises: a limiting adjusting screw, a sliding limiting pin and a limiting compression spring; the limiting adjusting screw is fixedly connected to the outer side of the connecting gear, the outer side of the limiting adjusting screw is provided with threads, and the limiting adjusting screw is threadedly connected to the inner side of the transmission adapter cylinder; the sliding limiting pin is slidably connected to the inner side of the limiting adjusting screw; and one end of the limiting compression spring is fixedly connected to the outer side of the sliding limiting pin, and the other end of the limiting compression spring is fixedly connected to the inner side of the limiting adjusting screw. Beneficial effects

[0016] The sealing mechanism is arranged, the automatic repair of the leak-proof sealing gasket is realized, the cavity is arranged in the leak-proof sealing gasket, the cavity is filled with polyurethane repair agent, when the leak-proof sealing gasket is worn or scratched to generate cracks, the cavity at the crack position releases the polyurethane repair agent, the crack is automatically filled and solidified, the function of the leak-proof sealing gasket is restored, under the cooperation of the axial pressure compensation ring and the extrusion compression spring, the extrusion compression spring continuously applies pressure to the axial pressure compensation ring, the axial pressure compensation ring always applies extrusion force to the leak-proof sealing gasket, due to the stress on both sides of the leak-proof sealing gasket and the limiting effect of the outer ring, the inner ring deforms correspondingly, the leak-proof sealing gasket is always tightly combined with the butterfly valve disc type valve flap, the sealing performance is improved, the service life of the valve is prolonged, and the maintenance and use costs are effectively reduced.

[0017] Furthermore, by adjusting the mechanism and rotating the operating handwheel, the drive worm gear is rotated via the connecting shaft. The drive worm gear meshes with the connecting worm wheel, thereby driving the butterfly valve disc to open or close via the valve stem drive shaft. Simultaneously, the rotation of the valve stem drive shaft also rotates the opening indicator dial, aligning it with different angle markings for easy observation of the current opening angle of the butterfly valve disc. The cooperation between the fixed limiting protrusion and the arc-shaped limiting guide groove provides initial limiting of the butterfly valve disc's rotation angle. In one step, by rotating the adjusting limit knob, the fixed gear ring is driven to rotate. The fixed gear ring meshes with the connecting gear, thereby driving the limit adjusting screw to rotate. The limit adjusting screw slides under the threaded engagement with the transmission connecting cylinder, which in turn drives the sliding limit pin to move and abut against the outside of the fixed limit support. When the sliding limit pin is aligned with the locking positioning hole, it will be inserted into the locking positioning hole to limit the fixed limit support, thereby preventing accidental operation of the handwheel from causing changes in the opening and closing angle of the butterfly valve disc and affecting the control accuracy.

[0018] Furthermore, the aforementioned mechanism not only enables automatic repair of the leak-proof sealing gasket, ensuring it maintains a good sealing condition and improving sealing performance, but also extends service life and reduces operating costs. Simultaneously, it provides adjustment and limiting functions for the opening and closing angle of the butterfly valve disc, effectively preventing the impact of misoperation, simplifying operation, and enhancing overall reliability and safety. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0020] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0021] In the attached diagram: Figure 1 This is a schematic diagram of the main body of Embodiment 1 of the present invention.

[0022] Figure 2 This is a cross-sectional structural schematic diagram of the butterfly valve body according to Embodiment 1 of the present invention.

[0023] Figure 3 This is a schematic diagram of the arc-shaped limiting guide groove of Embodiment 1 of the present invention.

[0024] Figure 4 This is a schematic diagram of the leak-proof sealing gasket of Embodiment 1 of the present invention.

[0025] Figure 5 This is Embodiment 1 of the present invention. Figure 4 A magnified structural diagram of part A in the middle.

[0026] Figure 6 This is a structural schematic diagram of the fixed limiting support according to Embodiment 2 of the present invention.

[0027] Figure 7 This is a schematic diagram of the structure of the fixed limiting protrusion in Embodiment 2 of the present invention.

[0028] Figure 8 This is a cross-sectional structural schematic diagram of the transmission connecting cylinder according to Embodiment 2 of the present invention.

[0029] Figure 9 This is a schematic diagram of the fixed gear ring according to Embodiment 2 of the present invention.

[0030] Figure 10 This is Embodiment 2 of the present invention. Figure 8 A magnified structural diagram of section B in the middle.

[0031] List of reference numerals 1. Butterfly valve body; 101. Mounting flange; 102. Mounting bolt holes; 103. Arc-shaped limit guide groove; 2. Mounting support; 3. Transmission box; 301. Angle indicator scale line; 4. Transmission connecting cylinder; 5. Valve stem transmission shaft; 501. Fixed base plate; 502. Fixed limit protrusion; 503. Connecting fixed shaft; 504. Opening degree indicator dial; 6. Butterfly valve disc; 7. Connecting shaft; 8. Operator's hand. 9. Leak-proof sealing gasket; 10. Axial pressure compensation ring; 1001. Compression spring; 11. Connecting worm gear; 12. Driving worm; 13. Fixed limit support; 1301. Locking positioning hole; 14. Adjusting limit knob; 1401. Fixed gear ring; 15. Connecting gear; 1501. Fixed sliding rod; 1502. Limit adjusting screw; 16. Sliding limit pin; 1601. Limit compression spring. Detailed Implementation Example

[0032] Please refer to Figures 1-5 As shown: This invention provides a corrosion-resistant butterfly valve with a self-healing sealing structure, comprising a butterfly valve body 1, mounting flanges 101, mounting bolt holes 102, mounting support 2, transmission box 3, transmission connecting sleeve 4, valve stem transmission shaft 5, butterfly valve disc 6, connecting shaft 7, operating handwheel 8, sealing mechanism, and adjusting mechanism; two mounting flanges 101 are provided, both of which are fixedly connected to the outside of the butterfly valve body 1; two sets of mounting bolt holes 102 are provided, and the two sets of mounting bolt holes 102 are respectively opened on the inside of the two mounting flanges 101; Mounting support 2 is fixedly mounted on the upper end face of butterfly valve body 1 by bolts; transmission box 3 is fixedly mounted on the upper end face of mounting support 2 by bolts; transmission connecting cylinder 4 is fixedly connected to the outside of transmission box 3; valve stem transmission shaft 5 is rotatably connected to the inside of butterfly valve body 1; butterfly valve disc 6 is fixedly connected to the outside of valve stem transmission shaft 5; connecting shaft 7 is rotatably connected to the inside of transmission connecting cylinder 4; operating handwheel 8 is fixedly connected to the outside of connecting shaft 7; sealing mechanism is located inside butterfly valve body 1; adjusting mechanism is located inside transmission box 3.

[0033] The sealing mechanism includes: a leak-proof sealing gasket 9, an axial pressure compensation ring 10, and a compression spring 1001. The leak-proof sealing gasket 9 is installed inside the butterfly valve body 1, and has a large number of cavities inside, which contain polyurethane repair agent. There are two axial pressure compensation rings 10, which are slidably connected to the inside of the butterfly valve body 1. The axial pressure compensation rings 10 are made of metal and are circular. There are two sets of compression springs 1001. One end of each set of compression springs 1001 is fixedly connected to the outside of the two axial pressure compensation rings 10, and the other end of each set of compression springs 1001 is fixedly connected to the inside of the butterfly valve body 1.

[0034] The specific usage and function of this embodiment: The leak-proof sealing gasket 9, through the internal cavity and the polyurethane repair agent in the cavity, when the leak-proof sealing gasket 9 cracks due to wear or scratches, the polyurethane repair agent will be released into the cavity affected by the crack, filling the crack and curing, restoring the function of the leak-proof sealing gasket 9. Under the setting of the axial pressure compensation ring 10 and the compression spring 1001, the compression spring 1001 will apply pressure to the axial pressure compensation ring 10, so that the axial pressure compensation ring 10 always compresses the leak-proof sealing gasket 9. The leak-proof sealing gasket 9 is subjected to force on both sides, and the outer ring of the leak-proof sealing gasket 9 is restricted, so that the inner ring will deform, so that the leak-proof sealing gasket 9 is always in contact with the disc valve disc 6 of the butterfly valve. Example

[0035] Based on Example 1, such as Figures 6-10As shown, the adjustment mechanism includes: an arc-shaped limiting guide groove 103, an angle indicator scale line 301, a fixed base plate 501, a fixed limiting protrusion 502, a connecting fixed shaft 503, an opening indicator dial 504, a connecting worm gear 11, a driving worm 12, a fixed limiting support 13, a locking positioning hole 1301, an adjusting limiting knob 14, a fixed gear ring 1401, a connecting gear 15, a fixed sliding rod 1501, a limiting adjusting screw 1502, a sliding limiting pin 16, and a limiting compression spring 1601; the arc-shaped limiting guide groove 103 is formed on the lower end face of the butterfly valve body 1; multiple angle indicator scale lines 301 are provided, and multiple angle indicator scale lines 301 are formed on the upper part of the transmission box 3. The valve stem drive shaft 501 is fixedly connected to the lower end face of the valve stem drive shaft 5 and rotatably connected to the lower end of the butterfly valve body 1. A fixed limiting protrusion 502 is fixedly connected to the upper end face of the fixed base plate 501 and slidably connected to the inner side of the arc-shaped limiting guide groove 103. A connecting fixed shaft 503 is fixedly connected to the upper end face of the valve stem drive shaft 5 and rotatably connected to the inner side of the transmission box 3. An opening degree indicator dial 504 is fixedly connected to the upper end face of the connecting fixed shaft 503 and rotatably connected to the upper end face of the transmission box 3. A connecting worm gear 11 is fixedly connected to the upper end face of the valve stem drive shaft 5 and rotatably connected to the upper end face of the transmission box 3. The drive worm 12 is fixedly connected to the outside of the connecting shaft 7 and rotatably connected to the inside of the transmission connecting cylinder 4. The drive worm 12 meshes with the connecting worm wheel 11. The fixed limiting support 13 is fixedly connected to the outside of the drive worm 12. The fixed limiting support 13 is circular and rotatably connected to the inside of the transmission connecting cylinder 4. Multiple locking positioning holes 1301 are provided, and all locking positioning holes 1301 are opened on the inside of the fixed limiting support 13. The adjusting limiting knob 14 is rotatably connected to the outside of the transmission connecting cylinder 4. The fixed gear ring 1401 is fixedly connected to the inside of the adjusting limiting knob 14. The connecting gear 15 is slidably connected to the transmission connecting cylinder 4. Inside the connecting cylinder 4, the connecting gear 15 meshes with the adjusting limit knob 14; the fixed sliding rod 1501 is fixedly connected to the outside of the connecting gear 15, and the fixed sliding rod 1501 is slidably connected to the inside of the adjusting limit knob 14; the limit adjusting screw 1502 is fixedly connected to the outside of the connecting gear 15, the limit adjusting screw 1502 is threaded on the outside, and the limit adjusting screw 1502 is threadedly connected to the inside of the transmission connecting cylinder 4; the sliding limit pin 16 is slidably connected to the inside of the limit adjusting screw 1502; one end of the limit compression spring 1601 is fixedly connected to the outside of the sliding limit pin 16, and the other end of the limit compression spring 1601 is fixedly connected to the inside of the limit adjusting screw 1502.

[0036] The specific usage and function of this embodiment: By rotating the operating handwheel 8, the operating handwheel 8 will drive the drive worm gear 12 to rotate via the connecting shaft 7. The rotation of the drive worm gear 12, under the action of meshing with the connecting worm wheel 11, will drive the butterfly valve disc 6 to open and close via the valve stem drive shaft 5. At the same time, the rotation of the valve stem drive shaft 5 will drive the opening degree indicator dial 504 to rotate, so that the opening degree indicator dial 504 points on different angle indicator scale lines 301, making it convenient to observe the opening and closing angle of the butterfly valve disc 6. The setting of the fixed limiting protrusion 502 and the arc-shaped limiting guide groove 103 can limit the rotation angle of the butterfly valve disc 6. Rotating the limit adjustment knob 14 will cause the fixed gear ring 1401 to rotate. The rotation of the fixed gear ring 1401 will cause the limit adjustment screw 1502 to rotate under the action of meshing with the connecting gear 15. The rotation of the limit adjustment screw 1502 will cause it to slide under the action of threaded connection with the transmission connecting cylinder 4. The sliding of the limit adjustment screw 1502 will cause the sliding limit pin 16 to slide, so that the sliding limit pin 16 abuts against the outside of the fixed limit support 13. When the sliding limit pin 16 is aligned with the locking positioning hole 1301, the sliding limit pin 16 will be inserted into the inside of the locking positioning hole 1301, thus limiting the fixed limit support 13.

[0037] The following points should be noted in this article: 1. The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention; other structures can refer to general designs.

[0038] 2. Where there is no conflict, the embodiments of the present invention and the features thereof can be combined with each other to obtain new embodiments.

[0039] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A corrosion-resistant butterfly valve with a self-healing sealing structure, comprising a butterfly valve body (1), mounting flanges (101), mounting bolt holes (102), mounting supports (2), a transmission box (3), a transmission connecting sleeve (4), a valve stem transmission shaft (5), a butterfly valve disc (6), a connecting shaft (7), an operating handwheel (8), a sealing mechanism, and an adjusting mechanism; wherein two mounting flanges (101) are provided, both of which are fixedly connected to the outside of the butterfly valve body (1); two sets of mounting bolt holes (102) are provided, and the two sets of mounting bolt holes (102) are respectively opened on the inside of the two mounting flanges (101); characterized in that: The mounting bracket (2) is fixedly mounted on the upper end face of the butterfly valve body (1) by bolts; the transmission box (3) is fixedly mounted on the upper end face of the mounting bracket (2) by bolts; the transmission connecting cylinder (4) is fixedly connected to the outside of the transmission box (3); the valve stem transmission shaft (5) is rotatably connected to the inside of the butterfly valve body (1); the butterfly valve disc (6) is fixedly connected to the outside of the valve stem transmission shaft (5); the connecting shaft (7) is rotatably connected to the inside of the transmission connecting cylinder (4); the operating handwheel (8) is fixedly connected to the outside of the connecting shaft (7); the sealing mechanism is located inside the butterfly valve body (1); and the adjusting mechanism is located inside the transmission box (3).

2. The corrosion-resistant butterfly valve with a self-healing sealing structure as described in claim 1, characterized in that: The sealing mechanism includes: a leak-proof sealing gasket (9); the leak-proof sealing gasket (9) is installed on the inner side of the butterfly valve body (1), and the leak-proof sealing gasket (9) has a large number of cavities inside, and polyurethane repair agent is provided in the cavities.

3. The corrosion-resistant butterfly valve with a self-healing sealing structure as described in claim 2, characterized in that: The sealing mechanism further includes: an axial pressure compensation ring (10) and a compression spring (1001); there are two axial pressure compensation rings (10), both of which are slidably connected to the inner side of the butterfly valve body (1). The axial pressure compensation rings (10) are made of metal and are circular; there are two sets of compression springs (1001). One end of each set of compression springs (1001) is fixedly connected to the outer side of the two axial pressure compensation rings (10), and the other end of each set of compression springs (1001) is fixedly connected to the inner side of the butterfly valve body (1).

4. The corrosion-resistant butterfly valve with a self-healing sealing structure as described in claim 1, characterized in that: The adjustment mechanism includes: an arc-shaped limiting guide groove (103), a fixed base plate (501), and a fixed limiting protrusion (502); the arc-shaped limiting guide groove (103) is opened on the lower end face of the butterfly valve body (1); the fixed base plate (501) is fixedly connected to the lower end face of the valve stem drive shaft (5), and the fixed base plate (501) is rotatably connected to the lower end of the butterfly valve body (1); the fixed limiting protrusion (502) is fixedly connected to the upper end face of the fixed base plate (501), and the fixed limiting protrusion (502) is slidably connected to the inner side of the arc-shaped limiting guide groove (103).

5. The corrosion-resistant butterfly valve with a self-healing sealing structure as described in claim 4, characterized in that: The adjustment mechanism further includes: angle indicator scale line (301), connecting fixed shaft (503), and opening indicator dial (504); multiple angle indicator scale lines (301) are provided, and multiple angle indicator scale lines (301) are opened on the upper end face of the transmission box (3); the connecting fixed shaft (503) is fixedly connected to the upper end face of the valve stem transmission shaft (5), and the connecting fixed shaft (503) is rotatably connected to the inner side of the transmission box (3); the opening indicator dial (504) is fixedly connected to the upper end face of the connecting fixed shaft (503), and the opening indicator dial (504) is rotatably connected to the upper end face of the transmission box (3).

6. The corrosion-resistant butterfly valve with a self-healing sealing structure as described in claim 5, characterized in that: The adjustment mechanism further includes: a connecting worm wheel (11) and a driving worm (12); the connecting worm wheel (11) is fixedly connected to the upper end face of the valve stem drive shaft (5), and the connecting worm wheel (11) is rotatably connected to the inner side of the transmission box (3); the driving worm (12) is fixedly connected to the outer side of the connecting shaft (7), and the driving worm (12) is rotatably connected to the inner side of the transmission connecting cylinder (4), and the driving worm (12) meshes with the connecting worm wheel (11).

7. The corrosion-resistant butterfly valve with a self-healing sealing structure as described in claim 6, characterized in that: The adjustment mechanism further includes: a fixed limiting support (13) and a locking positioning hole (1301); the fixed limiting support (13) is fixedly connected to the outside of the drive worm (12), the fixed limiting support (13) is circular, and the fixed limiting support (13) is rotatably connected to the inside of the transmission connecting cylinder (4); multiple locking positioning holes (1301) are provided, and multiple locking positioning holes (1301) are all opened on the inside of the fixed limiting support (13).

8. The corrosion-resistant butterfly valve with a self-healing sealing structure as described in claim 7, characterized in that: The adjustment mechanism further includes: an adjustment limit knob (14) and a fixed gear ring (1401); the adjustment limit knob (14) is rotatably connected to the outside of the transmission connecting cylinder (4); the fixed gear ring (1401) is fixedly connected to the inside of the adjustment limit knob (14).

9. The corrosion-resistant butterfly valve with a self-healing sealing structure as described in claim 8, characterized in that: The adjustment mechanism further includes a connecting gear (15) and a fixed sliding rod (1501); the connecting gear (15) is slidably connected to the inner side of the transmission connecting cylinder (4), and the connecting gear (15) meshes with the adjustment limit knob (14); the fixed sliding rod (1501) is fixedly connected to the outer side of the connecting gear (15), and the fixed sliding rod (1501) is slidably connected to the inner side of the adjustment limit knob (14).

10. The corrosion-resistant butterfly valve with a self-healing sealing structure as described in claim 9, characterized in that: The adjustment mechanism further includes: a limiting adjustment screw (1502), a sliding limiting pin (16), and a limiting compression spring (1601); the limiting adjustment screw (1502) is fixedly connected to the outside of the connecting gear (15), the limiting adjustment screw (1502) is threaded on the outside, and the limiting adjustment screw (1502) is threadedly connected to the inside of the transmission connecting cylinder (4); the sliding limiting pin (16) is slidably connected to the inside of the limiting adjustment screw (1502); one end of the limiting compression spring (1601) is fixedly connected to the outside of the sliding limiting pin (16), and the other end of the limiting compression spring (1601) is fixedly connected to the inside of the limiting adjustment screw (1502).

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