Metal sealing butterfly valve with double sealing pairs

Abstract

The invention discloses a metal sealing butterfly valve with double sealing pairs, and relates to the technical field of butterfly valves. Comprising a valve body, a mounting frame is fixedly mounted on the valve body, a connecting frame plate is fixedly mounted on the mounting frame, a driver is mounted on the connecting frame plate, a valve disc rod is fixedly mounted on the driver, and a fastening assembly is arranged on the connecting frame plate. A support plate is fixedly installed at the bottom end of the valve body, a sealing assembly is arranged on the support plate, and a first sealing ring and a second sealing ring which are symmetrically arranged are arranged on the sealing assembly. A connecting pipe is fixedly communicated with an inlet of the valve body, an anti-impact assembly is arranged on the connecting pipe, the sealing assembly comprises a U-shaped frame plate fixedly installed on the valve body, and a motor is fixedly installed on the U-shaped frame plate. Through cooperative use of the fastening assembly, the sealing assembly and the anti-impact assembly, the sealing performance and stability of the butterfly valve can be effectively improved, part abrasion is reduced, and the service life of the butterfly valve is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of butterfly valves, and particularly to a double-sealing-metal-sealed butterfly valve. Background Art

[0002] A butterfly valve, also called a flap valve, is a simple-structured regulating valve. A butterfly valve that can be used for the on-off control of a medium in a low-pressure pipeline refers to a valve in which the closing member (valve flap or butterfly plate) is a disc and rotates around the valve shaft to achieve opening and closing. It mainly functions as a cut-off and throttling in a pipeline. The opening and closing member of a butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve opening, closing or regulation.

[0003] In the prior art, a Chinese patent with the publication number "CN222669130U" discloses a butterfly valve. By installing a pressing plate on the connecting flange between the butterfly valve and the driving mechanism, the pressing plate is connected to the flange by screws. A sealing groove is designed in the middle of the pressing plate, and an O-ring is used for sealing between the pressing plate and the valve stem, achieving both radial sealing between the pressing plate and the valve connecting flange and axial sealing between the pressing plate and the valve stem. In this way, the valve does not need to be disassembled from the pipeline for maintenance, eliminating leakage and ensuring continuous production, and solving the problem that in the existing butterfly valves, when leakage occurs at the valve stem seal, only the entire valve body can be replaced or the seal is replaced after disassembly.

[0004] In the solution described above, by installing a pressing plate on the connecting flange and using the pressing plate to avoid the problem of replacing the entire valve body or the sealing ring. However, in this solution, after the valve body is connected to the pipeline, when the valve body needs to be opened, due to the flow resistance and pressure of the fluid, the connection between the pipeline and the butterfly valve will bear a large pressure. This pressure will cause wear, leakage or damage at the connection of the valve body, valve seat or pipeline. And in the prior art, the connection between the valve body and the pipeline is sealed by using a sealing ring and fastening bolts. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a double-sealing-metal-sealed butterfly valve, which solves the problems mentioned in the above background art.

[0006] To achieve the above purposes, the present invention is realized through the following technical solutions: A double-sealing-metal-sealed butterfly valve includes a valve body. An installation frame is fixedly installed on the valve body. A connecting frame plate is fixedly installed on the installation frame. A driver is installed on the connecting frame plate. A valve disc rod is fixedly installed on the driver. A fastening component is arranged on the connecting frame plate; A support plate is fixedly installed at the bottom end of the valve body. A sealing component is arranged on the support plate. A symmetrically arranged first sealing ring and a second sealing ring are arranged on the sealing component; A connecting pipe is fixedly connected to the inlet of the valve body, and an anti-impact component is arranged on the connecting pipe.

[0007] Preferably, the sealing component includes a U-shaped frame plate fixedly installed on the valve body. A motor is fixedly installed on the U-shaped frame plate. A driving gear is fixedly installed at the output end of the motor. Symmetrically arranged positioning shafts are fixedly installed on the lower end surface of the driving gear. A first driving rod and a second driving rod are respectively rotatably installed on the two positioning shafts.

[0008] Preferably, symmetrically arranged positioning rods are fixedly installed on the side end surface of the valve body. A positioning plate is fixedly installed at the end of the positioning rod far from the valve body. A connecting plate is slidably installed on the positioning rod. First U-shaped connecting plates and second U-shaped connecting plates are respectively fixedly installed on the side end surfaces of the first sealing ring and the second sealing ring. Positioning frames are fixedly installed on both the first U-shaped connecting plate and the second U-shaped connecting plate.

[0009] Preferably, the end of the first driving rod far from the positioning shaft is rotatably installed with the positioning frame on the first U-shaped connecting plate. The end of the second driving rod far from the positioning shaft is rotatably installed with the positioning frame on the second U-shaped connecting plate. The first sealing ring and the second sealing ring are respectively fixedly installed at the ends of the two connecting plates. The first U-shaped connecting plate is fixedly installed with the first sealing ring. The second U-shaped connecting plate is fixedly installed with the second sealing ring.

[0010] Preferably, the fastening component includes a driving bevel gear fixedly installed on the valve disc rod. Two L-shaped plates are fixedly installed on the side end surface of the connecting frame plate. A first threaded rod and a second threaded rod are respectively rotatably installed on the two L-shaped plates. First bevel gears and second bevel gears are respectively fixedly installed at the ends of the first threaded rod and the second threaded rod.

[0011] Preferably, nut blocks are movably installed on both the first threaded rod and the second threaded rod. A positioning slider is fixedly installed on the upper end surface of the nut block. Positioning chutes are formed on the two L-shaped plates. First fastening arc plates and second fastening arc plates are respectively fixedly installed on the lower end surfaces of the two nut blocks. Through grooves are formed on the side end surfaces of both the first fastening arc plate and the second fastening arc plate. Two stabilizing plates are fixedly installed on the lower end surface of the connecting frame plate.

[0012] Preferably, the driving bevel gear meshes with the first bevel gear and the second bevel gear respectively. The positioning slider is slidably installed in the positioning chute. The first fastening arc plate and the second fastening arc plate are symmetrically arranged. The first threaded rod and the second threaded rod are respectively rotatably installed with the two stabilizing plates.

[0013] Preferably, the impact protection component includes a U-shaped fixed plate fixedly installed on the connecting pipe, a bearing fixedly installed on the U-shaped fixed plate, an auxiliary rotating rod fixedly installed on the bearing, an impact protection plate fixedly installed on the side end face of the auxiliary rotating rod, and a large gear fixedly installed at the bottom end of the auxiliary rotating rod.

[0014] Preferably, the top end of the auxiliary rotating rod extends into the connecting pipe, the impact protection plate is inside the connecting pipe, the large gear and the driving gear are on the same horizontal plane, and the large gear meshes with the driving gear.

[0015] The present invention provides a double-sealing metal-sealed butterfly valve. Compared with the prior art, it has the following beneficial effects: 1. In the present invention, when the valve needs to be opened, the valve disc on the valve disc rod is driven to rotate by the driver, and then the driving gear is driven to rotate by the motor. The two positioning shafts on the driving gear will drive the first driving rod and the second driving rod to rotate respectively. Through the cooperation of the first driving rod and the positioning bracket on the first U-shaped connecting plate, and the cooperation of the second driving rod and the positioning bracket on the second U-shaped connecting plate, and then through the limiting sliding of the connecting plate on the positioning rod, the first sealing ring and the second sealing ring will move synchronously inward. Using the cooperation of the first sealing ring and the second sealing ring, the sealing of the connection between the valve body and the pipeline is completed, ensuring the sealing performance of the connection between the valve body and the pipeline; 2. In the present invention, when the driving gear rotates, through the cooperation of the driving gear and the large gear, the large gear will drive the auxiliary rotating rod to rotate synchronously when it rotates. The auxiliary rotating rod will be limited by the bearing, so as to drive the impact protection plate to rotate at an angle inside the connecting pipe. When the fluid passes through the impact protection plate, the originally generated impact force is dispersed and weakened, thus avoiding these impact forces acting directly on the valve disc, reducing the wear and damage of the valve components, and enabling the valve body to maintain close contact more stably; 3. In the present invention, when the valve disc rod rotates, it will drive the active bevel gear to rotate synchronously. Through the cooperation of the active bevel gear with the first bevel gear and the second bevel gear, the rotation of the first bevel gear and the second bevel gear is used to drive the rotation of the first threaded rod and the second threaded rod respectively. When the first threaded rod rotates, the nut block on the first threaded rod will drive the first fastening arc plate to move inward through the cooperation of the positioning slider and the positioning chute. At the same time, when the second threaded rod rotates, the nut block on the second threaded rod will drive the second fastening arc plate to move inward through the cooperation of the positioning slider and the positioning chute. Through the precise cooperation of the first fastening arc plate and the second fastening arc plate, the tight connection between the valve body and the pipeline can be realized, ensuring the sealing performance and stability of the valve. At the same time, using the cooperation of the first fastening arc plate and the second fastening arc plate, it is also more convenient to install the pipeline, effectively improving the use effect of the butterfly valve; 4. In the present invention, through the combined use of the fastening assembly, the sealing assembly and the anti-impact assembly, the sealing performance, stability of the butterfly valve can be effectively improved, component wear can be reduced, and the service life of the butterfly valve can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention Figure 1 ; Figure 2 is a schematic diagram of the overall structure of the present invention Figure 2 ; Figure 3 is a schematic diagram of the structure of the connecting pipe in the present invention; Figure 4 is a schematic diagram of the internal structure of the connecting pipe in the present invention; Figure 5 is Figure 2 an enlarged view of part A in Figure 6 is a schematic diagram of the structure of the fastening assembly in the present invention; Figure 7 is a schematic diagram of the structure of the sealing assembly in the present invention; Figure 8 is a schematic diagram of the structure of the anti-impact assembly in the present invention.

[0017] In the figure: 1, valve body; 2, mounting frame; 3, connecting frame plate; 4, driver; 5, valve disc rod; 6, support plate; 7, first sealing ring; 8, second sealing ring; 9, connecting pipe; 10, large gear; 11, motor; 12, driving gear; 13, positioning shaft; 14, first driving rod; 15, second driving rod; 16, positioning rod; 17, positioning plate; 18, connecting plate; 19, first U-shaped connecting plate; 20, second U-shaped connecting plate; 21, positioning frame; 22, driving bevel gear; 23, L-shaped plate; 24, first threaded rod; 25, second threaded rod; 26, first bevel gear; 27, second bevel gear; 28, nut block; 29, positioning slider; 30, positioning chute; 31, first fastening arc plate; 32, second fastening arc plate; 33, through groove; 34, stabilizing plate; 35, U-shaped fixing plate; 36, bearing; 37, auxiliary rotating rod; 38, anti-impact plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1-8, the present invention is a double-sealing pair metal-sealed butterfly valve, including a valve body 1, on which an installation frame 2 is fixedly installed, on the installation frame 2 a connecting frame plate 3 is fixedly installed, on the connecting frame plate 3 a driver 4 is installed, on the driver 4 a valve disc rod 5 is fixedly installed, on the connecting frame plate 3 a fastening assembly is provided, at the bottom end of the valve body 1 a support plate 6 is fixedly installed, on the support plate 6 a sealing assembly is provided, on the sealing assembly a symmetrically arranged first sealing ring 7 and a second sealing ring 8 are provided. Among them, the valve body 1 is a metal butterfly valve. Since the butterfly valve is an existing mechanism and its internal structure is well-known technology to those skilled in the art, no specific description will be given here; The sealing assembly includes a U-shaped frame plate fixedly installed on the valve body 1, on the U-shaped frame plate a motor 11 is fixedly installed, at the output end of the motor 11 a driving gear 12 is fixedly installed, at the lower end face of the driving gear 12 symmetrically arranged positioning shafts 13 are fixedly installed, on the two positioning shafts 13 a first driving rod 14 and a second driving rod 15 are respectively rotatably installed, on the side end face of the valve body 1 symmetrically arranged positioning rods 16 are fixedly installed, at the end of the positioning rod 16 away from the valve body 1 a positioning plate 17 is fixedly installed, on the positioning rod 16 a connecting plate 18 is slidably installed, on the side end faces of the first sealing ring 7 and the second sealing ring 8 a first U-shaped connecting plate 19 and a second U-shaped connecting plate 20 are respectively fixedly installed, on both the first U-shaped connecting plate 19 and the second U-shaped connecting plate 20 a positioning frame 21 is fixedly installed, the end of the first driving rod 14 away from the positioning shaft 13 is rotatably installed with the positioning frame 21 on the first U-shaped connecting plate 19, the end of the second driving rod 15 away from the positioning shaft 13 is rotatably installed with the positioning frame 21 on the second U-shaped connecting plate 20, the first sealing ring 7 and the second sealing ring 8 are respectively fixedly installed at the ends of the two connecting plates 18, the first U-shaped connecting plate 19 is fixedly installed with the first sealing ring 7, the second U-shaped connecting plate 20 is fixedly installed with the second sealing ring 8. Among them, the number of both the first sealing ring 7 and the second sealing ring 8 is two, and they are symmetrically arranged in pairs.

[0020] In this embodiment, when the valve needs to be opened, the driver 4 drives the valve disc on the valve disc rod 5 to rotate, and then the motor 11 drives the driving gear 12 to rotate. The two positioning shafts 13 on the driving gear 12 will respectively drive the first driving rod 14 and the second driving rod 15 to rotate. Through the cooperation between the first driving rod 14 and the positioning frame 21 on the first U-shaped connecting plate 19, and the cooperation between the second driving rod 15 and the positioning frame 21 on the second U-shaped connecting plate 20, and through the limiting sliding of the connecting plate 18 on the positioning rod 16, the first sealing ring 7 and the second sealing ring 8 will move inwards synchronously. By using the cooperation between the first sealing ring 7 and the second sealing ring 8, the sealing of the connection between the valve body 1 and the pipeline is completed, ensuring the sealing performance of the connection between the valve body 1 and the pipeline.

[0021] The fastening assembly includes an active bevel gear 22 fixedly mounted on the valve disc rod 5, and two L-shaped plates 23 are fixedly mounted on the side end surface of the connecting frame plate 3. The first threaded rod 24 and the second threaded rod 25 are rotatably mounted on the two L-shaped plates 23. The ends of the first threaded rod 24 and the second threaded rod 25 are fixedly mounted with a first bevel gear 26 and a second bevel gear 27 respectively. The first threaded rod 24 and the second threaded rod 25 are movably mounted with a nut block 28. The upper end surface of the nut block 28 is fixedly mounted with a positioning slider 29. The two L-shaped plates 23 are provided with a positioning slot 30. The lower end surfaces of the two nut blocks 28 are respectively fixedly mounted with a first fastening arc plate 31 and a second fastening arc plate 32. The side end surfaces of the first fastening arc plate 31 and the second fastening arc plate 32 are both opened. A through slot 33 is provided, and two stabilizing plates 34 are fixedly installed on the lower end surface of the connecting frame plate 3. The active bevel gear 22 is respectively engaged with the first bevel gear 26 and the second bevel gear 27. The positioning slider 29 is slidably installed in the positioning slide groove 30. The first fastening arc plate 31 and the second fastening arc plate 32 are symmetrically arranged. The first threaded rod 24 and the second threaded rod 25 are rotatably installed with the two stabilizing plates 34 respectively. The stabilizing plate 34 ensures that the first bevel gear 26 and the second bevel gear 27 will not shake significantly when driving the first threaded rod 24 and the second threaded rod 25 to rotate. At the same time, the first threaded rod 24 and the through slot 33 have a groove diameter greater than the diameter of the bolt, ensuring that the first fastening arc plate 31 and the second fastening arc plate 32 fit in the position of the pipeline connection.

[0022] In this embodiment, when the valve disc rod 5 rotates, it will synchronously drive the active bevel gear 22 to rotate. Through the cooperation between the active bevel gear 22 and the first bevel gear 26 and the second bevel gear 27, the rotation of the first bevel gear 26 and the second bevel gear 27 respectively drives the first threaded rod 24 and the second threaded rod 25 to rotate. When the first threaded rod 24 rotates, the nut block 28 on the first threaded rod 24 will cooperate with the positioning slide 30 through the positioning slider 29, thereby driving the first fastening arc plate 31 to move inward. At the same time, when the second threaded rod 25 rotates, the nut block 28 on the second threaded rod 25 will cooperate with the positioning slide 30 through the positioning slider 29, thereby driving the second fastening arc plate 32 to move inward. Through the precise cooperation between the first fastening arc plate 31 and the second fastening arc plate 32, a tight connection between the valve body 1 and the pipeline connection can be achieved, ensuring the sealing performance and stability of the valve. At the same time, the cooperation between the first fastening arc plate 31 and the second fastening arc plate 32 makes it more convenient to install the pipeline, effectively improving the use effect of the butterfly valve.

[0023] At the entrance of the valve body 1, a connecting pipe 9 is fixedly connected. An impact prevention component is arranged on the connecting pipe 9. The impact prevention component includes a U-shaped fixed plate 35 fixedly installed on the connecting pipe 9. A bearing 36 is fixedly installed on the U-shaped fixed plate 35. An auxiliary rotating rod 37 is fixedly installed on the bearing 36. An impact prevention plate 38 is fixedly installed on the side end face of the auxiliary rotating rod 37. A large gear 10 is fixedly installed at the bottom end of the auxiliary rotating rod 37. The top end of the auxiliary rotating rod 37 extends into the interior of the connecting pipe 9. The impact prevention plate 38 is located inside the connecting pipe 9. The large gear 10 and the driving gear 12 are on the same horizontal plane. The large gear 10 meshes with the driving gear 12. Among them, there is a sealing ring between the auxiliary rotating rod 37 and the connecting pipe 9 to ensure that the connecting pipe 9 will not leak when the auxiliary rotating rod 37 rotates. And the number of teeth of the large gear 10 is several times that of the driving gear 12 to ensure that when the driving gear 12 rotates several circles, the large gear 10 will only rotate a small angle.

[0024] In this embodiment, when the driving gear 12 rotates, through the cooperation of the driving gear 12 and the large gear 10, the large gear 10 will drive the auxiliary rotating rod 37 to rotate synchronously when rotating. The auxiliary rotating rod 37 will be limited by the bearing 36, so as to drive the impact prevention plate 38 to rotate at an angle inside the connecting pipe 9. When the fluid passes through the impact prevention plate 38, the originally generated impact force is dispersed and weakened, thus avoiding these impact forces directly acting on the valve disc, reducing the wear and damage of the valve components, and enabling the valve body 1 to maintain close contact more stably.

[0025] Working principle: During use, when the valve needs to be opened, the driver 4 drives the valve disc on the valve disc rod 5 to rotate, and then the motor 11 drives the driving gear 12 to rotate. The two positioning shafts 13 on the driving gear 12 will drive the first driving rod 14 and the second driving rod 15 to rotate respectively. Through the cooperation of the first driving rod 14 and the positioning bracket 21 on the first U-shaped connecting plate 19, and the cooperation of the second driving rod 15 and the positioning bracket 21 on the second U-shaped connecting plate 20, and then through the limiting sliding of the connecting plate 18 on the positioning rod 16, the first sealing ring 7 and the second sealing ring 8 will move synchronously inward. Using the cooperation of the first sealing ring 7 and the second sealing ring 8, the sealing of the connection between the valve body 1 and the pipeline is completed; When the driving gear 12 rotates, through the cooperation of the driving gear 12 and the large gear 10, the large gear 10 will drive the auxiliary rotating rod 37 to rotate synchronously when rotating. The auxiliary rotating rod 37 will be limited by the bearing 36, so as to drive the impact prevention plate 38 to rotate at an angle inside the connecting pipe 9. When the fluid passes through the impact prevention plate 38, the originally generated impact force is dispersed and weakened, thus avoiding these impact forces directly acting on the valve disc and reducing the wear and damage of the valve components; When the valve disc rod 5 rotates, it will synchronously drive the rotation of the driving bevel gear 22. Through the cooperation of the driving bevel gear 22 with the first bevel gear 26 and the second bevel gear 27, the rotation of the first bevel gear 26 and the second bevel gear 27 are used to drive the rotation of the first threaded rod 24 and the second threaded rod 25 respectively. When the first threaded rod 24 rotates, the nut block 28 on the first threaded rod 24 will drive the first fastening arc plate 31 to move inward through the cooperation of the positioning slider 29 and the positioning chute 30. At the same time, when the second threaded rod 25 rotates, the nut block 28 on the second threaded rod 25 will drive the second fastening arc plate 32 to move inward through the cooperation of the positioning slider 29 and the positioning chute 30. Through the precise cooperation of the first fastening arc plate 31 and the second fastening arc plate 32, a tight connection at the joint between the valve body 1 and the pipeline can be achieved, ensuring the sealing performance and stability of the valve. At the same time, using the cooperation of the first fastening arc plate 31 and the second fastening arc plate 32, it is also more convenient to install the pipeline.

[0026] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0027] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A double-sealing pair metal-sealed butterfly valve, comprising a valve body (1), characterized in that: An installation frame (2) is fixedly installed on the valve body (1). A connecting frame plate (3) is fixedly installed on the installation frame (2). A driver (4) is installed on the connecting frame plate (3). A valve disc rod (5) is fixedly installed on the driver (4). A fastening component is arranged on the connecting frame plate (3). A support plate (6) is fixedly installed at the bottom end of the valve body (1). A sealing component is arranged on the support plate (6). A first sealing ring (7) and a second sealing ring (8) which are symmetrically arranged are arranged on the sealing component. A connecting pipe (9) is fixedly communicated at the inlet of the valve body (1). An anti-impact component is arranged on the connecting pipe (9).

2. The double-sealing-pair metal-sealed butterfly valve according to claim 1, wherein: The sealing component includes a motor (11) fixedly installed on the support plate (6). A driving gear (12) is fixedly installed at the output end of the motor (11). Symmetrically arranged positioning shafts (13) are fixedly installed on the lower end surface of the driving gear (12). A first driving rod (14) and a second driving rod (15) are respectively rotatably installed on the two positioning shafts (13).

3. The double-sealing-metal-sealed butterfly valve according to claim 2, characterized in that: Symmetrically arranged positioning rods (16) are fixedly installed on the side end surface of the valve body (1). A positioning plate (17) is fixedly installed at one end of the positioning rod (16) away from the valve body (1). A connecting plate (18) is slidably installed on the positioning rod (16). First U-shaped connecting plates (19) and second U-shaped connecting plates (20) are respectively fixedly installed on the side end surfaces of the first sealing ring (7) and the second sealing ring (8). Positioning frames (21) are fixedly installed on both the first U-shaped connecting plate (19) and the second U-shaped connecting plate (20).

4. A double-sealing-metal-sealed butterfly valve according to claim 3, characterized in that: One end of the first driving rod (14) away from the positioning shaft (13) is rotatably installed with the positioning frame (21) on the first U-shaped connecting plate (19). One end of the second driving rod (15) away from the positioning shaft (13) is rotatably installed with the positioning frame (21) on the second U-shaped connecting plate (20). The first sealing ring (7) and the second sealing ring (8) are respectively fixedly installed at the ends of the two connecting plates (18). The first U-shaped connecting plate (19) is fixedly installed with the first sealing ring (7). The second U-shaped connecting plate (20) is fixedly installed with the second sealing ring (8).

5. The double-sealing pair metal-sealed butterfly valve according to claim 2, wherein: The fastening component includes a driving bevel gear (22) fixedly installed on the valve disc rod (5). Two L-shaped plates (23) are fixedly installed on the side end surface of the connecting frame plate (3). A first threaded rod (24) and a second threaded rod (25) are respectively rotatably installed on the two L-shaped plates (23). First bevel gears (26) and second bevel gears (27) are respectively fixedly installed at the ends of the first threaded rod (24) and the second threaded rod (25).

6. The double-sealing pair metal-sealed butterfly valve according to claim 5, wherein: Nut blocks (28) are movably installed on both the first threaded rod (24) and the second threaded rod (25). A positioning slider (29) is fixedly installed on the upper end surface of the nut block (28). Positioning chutes (30) are formed on the two L-shaped plates (23). First fastening arc plates (31) and second fastening arc plates (32) are respectively fixedly installed on the lower end surfaces of the two nut blocks (28). Through grooves (33) are formed on the side end surfaces of the first fastening arc plate (31) and the second fastening arc plate (32). Two stabilizing plates (34) are fixedly installed on the lower end surface of the connecting frame plate (3).

7. A double-sealing-metal-sealed butterfly valve according to claim 6, characterized in that: The driving bevel gear (22) meshes with the first bevel gear (26) and the second bevel gear (27) respectively. The positioning slider (29) is slidably installed in the positioning chute (30). The first fastening arc plate (31) and the second fastening arc plate (32) are symmetrically arranged. The first threaded rod (24) and the second threaded rod (25) are respectively rotatably installed with the two stabilizing plates (34).

8. A double-sealing pair metal-sealed butterfly valve according to claim 1, characterized in that: The impact prevention component includes a U-shaped fixed plate (35) fixedly installed on the connecting pipe (9). A bearing (36) is fixedly installed on the U-shaped fixed plate (35). An auxiliary rotating rod (37) is fixedly installed on the bearing (36). An impact prevention plate (38) is fixedly installed on the side end surface of the auxiliary rotating rod (37). A large gear (10) is fixedly installed at the bottom end of the auxiliary rotating rod (37).

9. A double-sealing pair metal-sealed butterfly valve according to claim 8, characterized in that: The top end of the auxiliary rotating rod (37) extends into the interior of the connecting pipe (9). The impact prevention plate (38) is located inside the connecting pipe (9). The large gear (10) and the driving gear (12) are on the same horizontal plane. The large gear (10) meshes with the driving gear (12).

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