A high temperature resistant butterfly valve

Abstract

The present invention relates to the field of valve technology, and specifically discloses a high temperature resistant butterfly valve, including a valve body, the valve body is equipped with a first fixed shell, the first fixed shell is equipped with a valve cover, the valve body is rotatably provided with a valve stem, the valve stem is equipped with a butterfly plate, the valve body is slidably provided with a valve seat, the valve seat is in contact with the butterfly plate, the valve seat is equipped with a sealing ring, the butterfly plate is provided with an annular groove that is limitedly matched with the sealing ring, the valve stem is provided with a first rotating shaft, the first rotating shaft is provided with a second rotating shaft, the second rotating shaft is fixedly connected with a worm gear, the first fixed shell is rotatably provided with a worm that meshes with the worm gear, the first fixed shell is provided with a limiting mechanism, and the valve body is provided with an adjusting mechanism. The present invention increases the sealing surface of the device and improves the sealing performance of the device by cooperating with the butterfly plate through the movement of the valve seat, and at the same time, the limiting cooperation of the valve seat and the butterfly plate wraps the sealing ring to extend the service life of the sealing ring.

Description

Technical Field

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

[0002] Butterfly valve is a commonly used valve type, mainly used to control the flow of fluid media in pipelines. Butterfly valve has been widely used in many fields due to its simple structure, easy operation, small size and light weight. However, the performance of butterfly valve mainly depends on the sealing structure in the valve body. Most traditional butterfly valves use simple rubber sealing rings for extrusion sealing, in which rubber sealing rings are often exposed to fluid media. When the temperature of the fluid medium in the pipeline is high, the temperature of the flowing medium is transferred to the rubber sealing ring, which can easily accelerate the aging of the rubber sealing ring and affect the sealing effect of the butterfly valve. At the same time, the frequent opening and closing of the butterfly valve causes the rubber sealing ring to wear, which further causes its sealing performance to deteriorate, resulting in its service life being shortened and unable to meet the use requirements. Therefore, we have launched a high temperature resistant butterfly valve to solve the above problems. Summary of the invention

[0003] In order to overcome the problem that the contact between the flowing medium and the rubber sealing ring in the traditional butterfly valve affects the service life of the traditional butterfly valve, the present invention provides a high temperature resistant butterfly valve.

[0004] The technical solution is: a high temperature resistant butterfly valve, comprising a valve body, the valve body is installed with a first fixed shell, the first fixed shell is installed with a valve cover on the side away from the valve body, the valve body is rotatably provided with a valve stem, the valve stem is detachably installed with a butterfly plate, the valve body is slidably provided with a valve seat, the valve seat is in contact with the butterfly plate, the valve seat is provided with an annular groove, a sealing ring is installed in the annular groove of the valve seat, the butterfly plate is provided with an annular groove, the annular groove of the butterfly plate is limitedly matched with the sealing ring, a sleeve is slidably provided on the valve stem, and the two ends of the sleeve are respectively connected to the first fixed shell and the The butterfly plate is in contact with each other, the valve stem is provided with a first rotating shaft, the first rotating shaft is provided with a second rotating shaft rotatably connected to the valve cover, a pointer is fixedly connected to the end of the first rotating shaft away from the valve stem, the valve cover is provided with a rectangular block for limiting the pointer, the second rotating shaft is fixedly connected to a worm gear, the first fixed shell is rotatably provided with a worm, the worm is meshed with the worm gear, a handwheel is installed at one end of the worm located outside the first fixed shell, a limiting mechanism for limiting the rotation of the worm is provided on the first fixed shell, and an adjusting mechanism for adjusting the movement of the valve seat is provided on the valve body.

[0005] Furthermore, the cross section of the annular groove on the valve seat is an isosceles trapezoid, and an annular cavity filled with gas is provided in the middle of the sealing ring to assist the sealing ring to become tightly attached to the annular groove of the butterfly plate.

[0006] Furthermore, the valve seat is slidably provided with a sliding sleeve slidably connected to the first fixed shell, and a tension spring is installed between the sliding sleeve and the valve seat.

[0007] Furthermore, the facing sides of the butterfly plate and the sliding sleeve are both provided with a frustum surface, and the frustum surface of the butterfly plate is extrusion-fitted with the frustum surface of the sliding sleeve.

[0008] Furthermore, the valve seat, the sealing ring and the sliding sleeve are all configured to be heat-insulating materials, so as to enhance the protection of the sealing ring.

[0009] Further, the limiting mechanism includes a first locking block, which is fixed to the first fixed shell, and the first locking block is sleeved on the outside of the worm and rotatably connected thereto, the worm is slidably provided with a second locking block, a spring is installed between the second locking block and the worm, the second locking block is limitedly matched with the first locking block, and the second locking block is fixed to the first fixed frame.

[0010] Further, the adjusting mechanism includes a fixing ring, which is fixedly connected to the valve body, and the fixing ring is slidably connected to the valve seat, the valve body, the valve seat and the fixing ring form a liquid filling chamber, the valve seat is provided with through holes equidistantly distributed in the circumferential direction, the through holes on the valve seat are used to connect the annular groove thereon and the liquid filling chamber on the valve body, the valve body is fixedly connected with a conduit, the conduit and the liquid filling chamber of the valve body are both filled with liquid, the conduit is communicated with the liquid filling chamber on the valve body, a second fixed shell is fixedly connected to a side of the first fixed shell close to the worm, the second fixed shell is fixedly connected to and communicated with the conduit, a sliding push rod is slidably provided on the second fixed shell, a spring is installed between the sliding push rod and the second fixed shell, the sliding push rod is fixedly connected to a second fixing frame, the second fixing frame is sleeved on the outside of the worm, and the second fixing frame is extruded and fitted with the second locking block.

[0011] Furthermore, a sliding column is slidably provided on the side wall of the second fixed shell, a spring is installed between the sliding column and the second fixed shell, and the sliding column is limitedly matched with the sliding push rod.

[0012] Furthermore, a sliding plate is slidably arranged on one side of the second fixed shell close to the guide tube, and a spring is installed between the sliding plate and the sliding column.

[0013] Furthermore, it also includes an emergency closing mechanism for quickly rotating the butterfly plate, the emergency closing mechanism is arranged on the second rotating shaft, the valve stem is rotatably connected to the first rotating shaft, the first rotating shaft is rotatably connected to the second rotating shaft, the first rotating shaft is provided with a spline groove, the emergency closing mechanism includes a third locking block, the third locking block is fixedly connected to one end of the second rotating shaft located in the first fixed shell, the valve stem is provided with a spline groove, the spline groove of the valve stem is limitedly slidably provided with a third rotating shaft, the third rotating shaft sleeve is limitedly slidable on the spline groove of the first rotating shaft, and the third rotating shaft sleeve is limitedly slidable on the spline groove of the first rotating shaft. The three rotating shafts are fixedly connected with a fourth locking block, and the fourth locking block is limitedly matched with the third locking block. The fourth locking block is fixedly connected with a centrally symmetrical guide rod, the first fixed shell is provided with a centrally symmetrical arc groove, the guide rod is located on the first fixed shell and slides in the adjacent arc groove, the first fixed shell is rotatably provided with a rotating ring for covering the arc groove thereon, the guide rod penetrates the rotating ring and is slidably connected thereto, the centrally symmetrical guide rods are jointly fixed with an annular plate, the annular plate is slidably sleeved on the outer side of the first fixed shell, and a tension spring is installed between the annular plate and the rotating ring.

[0014] The present invention has the following advantages: the present invention increases the sealing surface of the device and improves the sealing performance of the device through the movement of the valve seat and the cooperation with the butterfly plate. At the same time, the limit cooperation of the valve seat and the butterfly plate wraps the sealing ring, thereby extending the service life of the sealing ring. The sealing ring is shielded by the sliding sleeve to avoid contact between the sealing ring and the flowing medium in the valve body, and the aging of the sealing ring due to friction or high temperature is slowed down, thereby further improving the service life of the sealing ring. The limit cooperation of the first locking block and the second locking block can avoid accidental opening of the device and improve the working stability of the device. The separation of the limit cooperation of the third locking block and the fourth locking block can facilitate the operator to quickly rotate the butterfly plate in an emergency so that the valve body can quickly cut off the flow of the medium, thereby improving the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the three-dimensional structure of the valve body and the components in the first fixed shell of the present invention;

[0017] Figure 3 It is a cross-sectional view of the components of the first fixed housing and the worm gear of the present invention;

[0018] Figure 4 is a cross-sectional view of the limiting mechanism of the present invention;

[0019] Figure 5 It is a cross-sectional view of the components of the valve seat and the sealing ring of the present invention;

[0020] Figure 6 is a cross-sectional view of the adjustment mechanism of the present invention;

[0021] Figure 7 is a cross-sectional view of the emergency closing mechanism of the present invention;

[0022] Figure 8 It is an exploded view of the emergency closing mechanism of the present invention.

[0023] Figure numbers: 1, valve body, 11, first fixed shell, 12, valve cover, 13, valve stem, 131, first rotating shaft, 132, pointer, 14, butterfly plate, 141, valve seat, 142, sealing ring, 143, sliding sleeve, 15, sleeve, 16, second rotating shaft, 17, worm gear, 18, worm, 2, first locking block, 22, second locking block, 23, first fixed frame, 3, fixed ring, 31, guide tube, 32, second fixed shell, 33, sliding push rod, 34, second fixed frame, 35, sliding column, 36, sliding plate, 42, third locking block, 43, third rotating shaft, 44, fourth locking block, 45, guide rod, 46, rotating ring, 47, annular plate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In existing butterfly valves, rubber sealing rings are often used to provide sealing. However, due to the temperature of the fluid medium in the butterfly valve, the fluid temperature is easily transferred to the rubber sealing ring, accelerating the aging of the rubber sealing ring and shortening its service life. At the same time, the scouring of the rubber sealing ring by the flowing medium further accelerates the aging and wear of the rubber sealing ring, resulting in a shortened service life.

[0026] The present invention develops a butterfly valve that reduces the contact time of a sealing ring in a valve body and a fluid medium therein.

[0027] Embodiment 1: A high temperature resistant butterfly valve, such as Figure 1-Figure 4As shown, it includes a valve body 1, a first fixed shell 11 is installed on the upper part of the valve body 1, a valve cover 12 is installed on the upper side of the first fixed shell 11 by bolts, a valve stem 13 is rotatably provided in the middle part of the valve body 1, the valve stem 13 is located in the first fixed shell 11 and is rotatably connected thereto, a butterfly plate 14 is detachably installed on the valve stem 13, a valve seat 141 contacting and cooperating with the butterfly plate 14 is slidably provided in the valve body 1, an annular groove is provided on the right part of the valve seat 141, and the annular groove of the valve seat 141 is provided. A sealing ring 142 is installed in the shaped groove, and an annular groove which is limitedly matched with the sealing ring 142 is arranged on the outer side surface of the left part of the butterfly plate 14. A sleeve 15 is slidably arranged on the upper part of the valve stem 13, and the two ends of the sleeve 15 are respectively in contact with the first fixed shell 11 and the butterfly plate 14. A first rotating shaft 131 is arranged on the upper part of the valve stem 13, and a second rotating shaft 16 which is rotatably connected with the valve cover 12 is arranged on the upper part of the first rotating shaft 131. A pointer is fixedly connected to the upper end of the first rotating shaft 131. 132, two rectangular blocks are provided on the upper surface of the valve cover 12, and the two rectangular blocks are used to limit the swing range of the pointer 132, so that the operator can accurately adjust it to the fully open state and the closed rotation, and the upper surface of the valve cover 12 is provided with a scale for displaying the opening angle of the butterfly plate 14, so that the operator can accurately adjust the swing angle of the butterfly plate 14, thereby controlling the flow cross-section in the valve body 1, and a worm gear 17 is fixedly connected to the lower part of the second rotating shaft 16, and a worm 18 meshing with the worm gear 17 is provided in the left rotation in the first fixed shell 11, and a hand wheel is installed at the front end of the worm 18, and a limiting mechanism for limiting the rotation of the worm 18 is provided on the first fixed shell 11, and an adjusting mechanism for adjusting the movement of the valve seat 141 is provided on the valve body 1, and the valve seat 141 and the butterfly plate 14 are used to limit the cooperation to wrap the sealing ring 142, so as to reduce the contact time of the sealing ring 142 with the fluid medium, thereby improving the protection of the sealing ring 142 and extending its service life.

[0028] like Figure 4 and Figure 5As shown, the cross section of the annular groove on the valve seat 141 is an isosceles trapezoid, and a gas-filled annular cavity is provided in the middle of the sealing ring 142, which is used to assist the sealing ring 142 in deforming and closely fitting the annular groove of the butterfly plate 14 and the annular groove on the valve seat 141, thereby improving the sealing performance between the sealing ring 142 and the valve seat 141 and the butterfly plate 14. A sliding sleeve 143 is slidably provided on the left part of the valve seat 141, and the sliding sleeve 143 is sealingly slidably connected to the first fixed shell 11. A round table surface is provided on the left side of the sliding sleeve 143, which is used to reduce the impact force of the flowing medium on the sliding sleeve 143. The sliding sleeve 143 and the first fixed shell 11 are connected in a sealing manner. A tension spring is installed between the left side surfaces of the valve seat 141, and the facing sides of the butterfly plate 14 and the sliding sleeve 143 are provided with frustum surfaces. The frustum surface of the butterfly plate 14 is squeezed and matched with the frustum surface of the sliding sleeve 143, so that the contact surface of the device in a closed state is folded, further improving the sealing performance of the device. The valve seat 141, the sealing ring 142 and the sliding sleeve 143 are all set to heat-insulating materials for strengthening the protection of the sealing ring 142. The shielding of the sealing ring 142 by the sliding sleeve 143 in the open state can further slow down the aging of the sealing ring 142 and extend the service life of the sealing ring 142.

[0029] like Figure 3 As shown, the limiting mechanism includes a first locking block 2, which is fixed to the left part of the front side surface of the first fixed shell 11, and the first locking block 2 is sleeved on the outer side of the worm 18 and is rotatably connected thereto, a slide groove is provided at the front part of the worm 18, and a second locking block 22 which is limitedly matched with the first locking block 2 is slidably provided in the slide groove of the worm 18, a spring is installed between the front side surface of the second locking block 22 and the worm 18, the second locking block 22 is fixedly connected to a first fixing frame 23, and the first fixing frame 23 is located on the rear side of the hand wheel on the worm 18, and the limiting cooperation of the first locking block 2 and the second locking block 22 is utilized to prevent the operator from accidentally touching the device.

[0030] like Figure 3 , Figure 5 and Figure 6As shown, the regulating mechanism includes a fixing ring 3, which is fixedly connected to the valve body 1, and the fixing ring 3 is sealingly slidably connected to the valve seat 141. The valve body 1, the valve seat 141 and the fixing ring 3 form a liquid filling cavity. The right part of the valve seat 141 is provided with through holes equidistantly distributed in the circumferential direction. The through holes on the valve seat 141 are used to connect the annular groove thereon and the liquid filling cavity on the valve body 1. A conduit 31 is fixedly connected to the left side of the upper surface of the valve body 1. The conduit 31 and the liquid filling cavity of the valve body 1 are both filled with liquid. The conduit 31 is connected to the liquid filling cavity on the valve body 1. A second fixed shell 32 is fixedly connected to the left side of a fixed shell 11, and the rear part of the second fixed shell 32 is fixedly connected to and communicated with the upper end of the guide tube 31. A sliding push rod 33 is slidably provided at the front part of the second fixed shell 32, and a spring is installed between the sliding push rod 33 and the second fixed shell 32. A second fixed frame 34 is fixedly connected to the front end of the sliding push rod 33. The second fixed frame 34 is sleeved on the outside of the worm 18, and the second fixed frame 34 is pressed and matched with the second locking block 22. The second locking block 22 is used to move and squeeze the second fixed frame 34 moves, the second fixed frame 34 moves through the connected parts to control the movement of the valve seat 141, first release the cooperation between the valve seat 141 and the butterfly plate 14, pre-depressurize the valve body 1, and reduce the resistance of the butterfly plate 14 during rotation. The left side wall of the second fixed shell 32 is slidably provided with a sliding column 35, and a spring is installed between the left side surface of the sliding column 35 and the second fixed shell 32. The right end of the sliding column 35 is set to a hemispherical shape, and the hemispherical end of the sliding column 35 is limitedly matched with the sliding push rod 33, which is used to In order to improve the stability of the valve seat 141 and the butterfly plate 14 under the action of limiting cooperation, a sliding plate 36 is slidably provided at the rear of the second fixed shell 32, and a spring is installed between the front side of the sliding plate 36 and the rear side of the sliding column 35. The elastic force of the spring connected to the sliding plate 36 is utilized to apply pressure to the liquid in the liquid filling cavity on the valve body 1. The liquid pressure acts on the sealing ring 142 through the through hole on the valve body 1, thereby increasing the extrusion force between the sealing ring 142 and the butterfly plate 14, thereby improving the sealing between the two.

[0031] During use, the device is installed in the conveying pipeline. In the initial state, the butterfly plate 14 is in contact with the valve seat 141, and the round table surface of the sliding sleeve 143 is squeezed and matched with the round table surface of the butterfly plate 14. At the same time, the tension spring between the sliding sleeve 143 and the valve seat 141 is in a stretched state, so that the conveying pipeline is in a blocked state. When the conveying pipeline needs to convey a fluid medium, the operator first pulls the first fixing frame 23 and the second locking block 22 forward, and the first fixing frame 23 moves forward to compress the connected spring, and the second locking block 22 moves to release the limit fit with the first locking block 2.

[0032] During the forward movement of the second locking block 22, the second locking block 22 simultaneously squeezes the second fixing frame 34 forward, and the second fixing frame 34 drives the sliding push rod 33 to move forward through the sliding column 35. The sliding column 35 is squeezed and moved to compress the connected spring. After the sliding push rod 33 passes the sliding column 35, the sliding column 35 moves back and resets under the elastic force of the connected spring. The sliding push rod 33 moves forward to compress the spring on its front side and drives the spring on its rear side and the sliding plate 36 to move forward together. The sliding plate 36 moves forward to draw the liquid in the liquid filling chamber on the valve body 1 into the second fixed shell 32 through the conduit 31. The liquid in the liquid filling chamber on the valve body 1 becomes less, so that its internal pressure becomes smaller, and the sealing ring 142 will shrink into the annular groove of the valve seat 141. The sealing ring 142 is separated from the cooperation with the annular groove on the butterfly plate 14. Then the valve seat 141 gradually moves to the left and gradually separates from the cooperation with the butterfly plate 14, gradually opening the blockage of the valve body 1.

[0033] During the leftward movement of the valve seat 141 , the sliding sleeve 143 is gradually moved to cover the sealing ring 142 under the tension of the tension spring connected to the valve seat 141 , thereby preventing the flowing medium in the valve body 1 from contacting the sealing ring 142 , improving the protection of the sealing ring 142 , and thus slowing down the aging of the sealing ring 142 .

[0034] After the second locking block 22 has moved, the valve seat 141 will drive the sliding sleeve 143 to move left together to release the cooperation with the butterfly plate 14, so that the valve body 1 is unblocked. Then the operator holds the hand wheel on the worm 18 and the first fixed frame 23 to rotate counterclockwise. The rotation of the worm 18 drives the butterfly plate 14 to rotate counterclockwise through the worm gear 17, the second rotating shaft 16, the first rotating shaft 131 and the valve stem 13. The counterclockwise rotation of the butterfly plate 14 gradually changes the flow cross-section in the valve body 1, so that the medium in the conveying pipeline moves accordingly.

[0035] During the rotation and adjustment of the worm 18, the second shaft 16 drives the pointer 132 to swing together through the first shaft 131. According to the value indicated by the pointer 132 on the valve cover 12, the opening state of the butterfly plate 14 can be understood, which is convenient for the operator to control the size of the flow cross-section in the valve body 1.

[0036] After the adjustment is completed, the operator releases the handwheel on the first fixing frame 23 and the worm 18. Under the elastic force of the spring connected to the second locking block 22, the second locking block 22 and the first fixing frame 23 move backward and reset. The second locking block 22 moves backward and simultaneously re-matches with the first locking block 2 to complete the locking of the worm 18. At the same time, combined with the unidirectional transmission of the worm 18 and the worm wheel 17, the adjusted butterfly plate 14 is limited and fixed through the connected components, so that the butterfly plate 14 is stably maintained in the adjusted state, and the size of the flow cross section in the valve body 1 is maintained.

[0037] After the first fixed frame 23 is reset, the sliding push rod 33 moves in the opposite direction and resets due to the elastic force of the spring on the front side of the sliding push rod 33. The sliding push rod 33 moves backward through the spring on the rear side and the sliding plate 36. The sliding plate 36 moves backward to press the liquid in the second fixed shell 32 into the liquid filling cavity on the valve body 1 through the conduit 31. Then the valve seat 141 and the sliding sleeve 143 will move to the right to contact the side of the butterfly plate 14.

[0038] When it is necessary to stop the flow of the medium in the conveying pipeline, the operator first presses the first fixing frame 23 to repeat the above operation, and then the operator turns the handwheel on the first fixing frame 23 and the worm 18 clockwise to make the pointer 132 point to the word "closed" engraved on the valve cover 12, and then the operator releases the first fixing frame 23 to make the second locking block 22 fit with the first locking block 2 again, and at the same time, the valve seat 141 is reinserted between the valve body 1 and the butterfly plate 14, and the sealing ring 142 is fit with the annular groove on the valve body 1 again, and at the same time, the frustum of the sliding sleeve 143 is squeezed and fit with the frustum of the butterfly plate 14, and the tension spring between the valve seat 141 and the sliding sleeve 143 is restored to the stretched state, so that the valve body 1 is restored to the blocked state.

[0039] Embodiment 2: Based on embodiment 1, Figure 2 , Figure 7 and Figure 8 As shown, it also includes an emergency closing mechanism for quickly rotating the butterfly plate 14, the emergency closing mechanism is arranged on the second rotating shaft 16, the valve stem 13 is rotatably connected to the first rotating shaft 131, the first rotating shaft 131 is rotatably connected to the second rotating shaft 16, the lower part of the first rotating shaft 131 is provided with a spline groove, the emergency closing mechanism includes a third locking block 42, the third locking block 42 is fixedly connected to the lower end of the second rotating shaft 16, the upper part of the valve stem 13 is provided with a spline groove, the spline groove of the valve stem 13 is limitedly slidably provided with a third rotating shaft 43 that is limitedly slidable with the spline groove part on the first rotating shaft 131, the upper end of the third rotating shaft 43 is fixedly connected with a fourth locking block 44 that is limitedly matched with the third locking block 42, and the fourth The front and rear parts of the locking block 44 are fixedly connected with guide rods 45. The lower part of the first fixed shell 11 is provided with two centrally symmetrical arc grooves. The two guide rods 45 are respectively located in the two arc grooves on the first fixed shell 11 and slide. A rotating ring 46 for covering the two arc grooves thereon is rotatably provided on the first fixed shell 11. The two guide rods 45 both penetrate the rotating ring 46 and are slidably connected thereto. The lower ends of the two guide rods 45 are commonly fixedly connected with an annular plate 47 that slides with the first fixed shell 11. A tension spring is installed between the annular plate 47 and the rotating ring 46. The working mode of the device is controlled by the cooperation and separation of the third locking block 42 and the fourth locking block 44, thereby improving the adaptability and safety of the device.

[0040] During the use of the device, when an emergency situation requires the urgent cutting off of the flowing medium in the conveying pipeline, the operator first presses the annular plate 47, and the annular plate 47 drives the fourth locking block 44 and the third rotating shaft 43 to move downward through the two guide rods 45. The annular plate 47 moves downward to stretch the connected tension spring, and the fourth locking block 44 moves downward to release the limiting cooperation with the third locking block 42. Then the operator holds the annular plate 47 and rotates it clockwise. The rotation of the annular plate 47 drives the third rotating shaft 43 to rotate through the two guide rods 45 and the fourth locking block 44. The rotation of the third rotating shaft 43 drives the valve stem 13, the first rotating shaft 131 and the pointer 132 to rotate clockwise. The pointer 132 will point to the scale of the word "close" on the valve cover 12. At this time, the valve stem 13 will drive the butterfly plate 14 to rotate quickly to be parallel to the cross section of the valve body 1.

[0041] After the butterfly plate 14 has completed its rotation, the operator releases the annular plate 47. Under the tension of the tension spring connected to the annular plate 47, the annular plate 47 drives the connected parts to perform the above-mentioned opposite movement, wherein the fourth locking block 44 is again limitedly matched with the third locking block 42, wherein the butterfly plate 14 rotates to first squeeze the valve seat 141 and the sliding sleeve 143 to move to the left, and then under the elastic force of the spring on the front side of the sliding push rod 33, the sliding push rod 33 drives the connected parts to repeat the above-mentioned reset movement, and finally the valve seat 141 and the sliding sleeve 143 are both in contact with the butterfly plate 14, and at the same time, the sealing ring 142 is squeezed and matched with the annular groove on the butterfly plate 14, so that the medium in the conveying pipeline stops flowing, so that the device can be quickly closed in an emergency.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A high temperature resistant butterfly valve, characterized in that: The invention comprises a valve body (1), wherein the valve body (1) is provided with a first fixed shell (11), a valve cover (12) is provided on a side of the first fixed shell (11) away from the valve body (1), the valve body (1) is rotatably provided with a valve stem (13), a butterfly plate (14) is detachably provided on the valve stem (13), a valve seat (141) is slidably provided on the valve body (1), the valve seat (141) is in contact with and cooperates with the butterfly plate (14), the valve seat (141) is provided with an annular groove, a sealing ring (142) is installed in the annular groove of the valve seat (141), the butterfly plate (14) is provided with an annular groove, the annular groove of the butterfly plate (14) is limitedly cooperated with the sealing ring (142), a sleeve (15) is slidably provided on the valve stem (13), and two ends of the sleeve (15) are respectively connected to the first fixed shell (11) and the butterfly plate (14). The valve stem (13) is provided with a first rotating shaft (131), the first rotating shaft (131) is provided with a second rotating shaft (16) rotatably connected to the valve cover (12), a pointer (132) is fixedly connected to one end of the first rotating shaft (131) away from the valve stem (13), the valve cover (12) is provided with a rectangular block for limiting the pointer (132), the second rotating shaft (16) is fixedly connected to a worm gear (17), the first fixed shell (11) is rotatably provided with a worm (18), the worm (18) is meshed with the worm gear (17), a hand wheel is installed at one end of the worm (18) located outside the first fixed shell (11), a limiting mechanism for limiting the rotation of the worm (18) is provided on the first fixed shell (11), and an adjusting mechanism for adjusting the movement of the valve seat (141) is provided on the valve body (1); The valve seat (141) is slidably provided with a sliding sleeve (143) slidably connected to the first fixed shell (11), and a tension spring is installed between the sliding sleeve (143) and the valve seat (141); The butterfly plate (14) and the sliding sleeve (143) are both provided with a frustum surface on the facing sides thereof, and the frustum surface of the butterfly plate (14) is extruded and fitted with the frustum surface of the sliding sleeve (143).

2. A high temperature resistant butterfly valve according to claim 1, characterized in that: The cross section of the annular groove on the valve seat (141) is an isosceles trapezoid, and an annular cavity filled with gas is provided in the middle of the sealing ring (142) to assist the sealing ring (142) in deforming and fitting tightly against the annular groove of the butterfly plate (14).

3. A high temperature resistant butterfly valve according to claim 1, characterized in that: The valve seat (141), the sealing ring (142) and the sliding sleeve (143) are all configured as heat-insulating materials, so as to enhance the protection of the sealing ring (142).

4. A high temperature resistant butterfly valve according to claim 1, characterized in that: The limiting mechanism comprises a first locking block (2), the first locking block (2) being fixedly connected to the first fixed shell (11), and the first locking block (2) being sleeved on the outer side of the worm (18) and being rotatably connected thereto, the worm (18) being slidably provided with a second locking block (22), a spring being installed between the second locking block (22) and the worm (18), the second locking block (22) being limitedly matched with the first locking block (2), and the second locking block (22) being fixedly connected to a first fixed frame (23).

5. A high temperature resistant butterfly valve according to claim 4, characterized in that: The regulating mechanism comprises a fixing ring (3), the fixing ring (3) being fixedly connected to the valve body (1), the fixing ring (3) being slidably connected to the valve seat (141), the valve body (1), the valve seat (141) and the fixing ring (3) forming a liquid filling cavity, the valve seat (141) being provided with through holes equidistantly distributed in the circumferential direction, the through holes on the valve seat (141) being used to connect the annular groove thereon and the liquid filling cavity on the valve body (1), the valve body (1) being fixedly connected to a conduit (31), the conduit (31) and the liquid filling cavity of the valve body (1) being both filled with liquid, the conduit (31) and the valve body (1) The upper filling chamber is connected, a second fixed shell (32) is fixedly connected to a side of the first fixed shell (11) close to the worm (18), the second fixed shell (32) is fixedly connected to and connected to the guide tube (31), the second fixed shell (32) is slidably provided with a sliding push rod (33), a spring is installed between the sliding push rod (33) and the second fixed shell (32), the sliding push rod (33) is fixedly connected to a second fixed frame (34), the second fixed frame (34) is sleeved on the outside of the worm (18), and the second fixed frame (34) is pressed and matched with the second locking block (22).

6. A high temperature resistant butterfly valve according to claim 5, characterized in that: A sliding column (35) is slidably provided on the side wall of the second fixed shell (32), a spring is installed between the sliding column (35) and the second fixed shell (32), and the sliding column (35) is limitedly matched with the sliding push rod (33).

7. A high temperature resistant butterfly valve according to claim 6, characterized in that: A sliding plate (36) is slidably disposed on one side of the second fixed shell (32) close to the guide tube (31), and a spring is installed between the sliding plate (36) and the sliding column (35).

8. A high temperature resistant butterfly valve according to claim 1, characterized in that: The valve stem (13) is rotatably connected to the first rotating shaft (131), the first rotating shaft (131) is rotatably connected to the second rotating shaft (16), the first rotating shaft (131) is provided with a spline groove, the emergency closing mechanism includes a third locking block (42), the third locking block (42) is fixedly connected to one end of the second rotating shaft (16) located in the first fixed shell (11), the valve stem (13) is provided with a spline groove, the spline groove of the valve stem (13) is provided with a third rotating shaft (43) in a limited sliding manner, the third rotating shaft (43) is sleeved on the spline groove portion of the first rotating shaft (131) for limited sliding, the third rotating shaft (43) is ) is fixedly connected with a fourth locking block (44), the fourth locking block (44) and the third locking block (42) are limitedly matched, the fourth locking block (44) is fixedly connected with a centrally symmetrical guide rod (45), the first fixed shell (11) is provided with a centrally symmetrical arc groove, the guide rod (45) is located on the first fixed shell (11) and slides in the adjacent arc groove, the first fixed shell (11) is rotatably provided with a rotating ring (46) for covering the arc groove thereon, the guide rod (45) penetrates the rotating ring (46) and is slidably connected thereto, the centrally symmetrical guide rods (45) are jointly fixedly connected with an annular plate (47), the annular plate (47) is sleeved on the outer side of the first fixed shell (11) and slides, and a tension spring is installed between the annular plate (47) and the rotating ring (46).

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