Bidirectional sealing butterfly valve

Abstract

The invention relates to the technical field of butterfly valves, in particular to a two-way sealing butterfly valve which comprises a valve body, a valve rod, a butterfly plate, a sealing ring, a pressing plate and a valve seat, the valve rod is installed in the valve body and connected with the butterfly plate, a step column structure is arranged on the butterfly plate, the butterfly plate and the pressing plate are installed in a nested mode through a fastener, and the sealing ring arranged on a step column of the butterfly plate in a sleeving mode is clamped by the pressing plate. The valve seat is connected into the valve body in a sliding mode, when the butterfly plate is closed, the sealing ring is attached to the valve seat, a floating assembly is arranged in the valve body, a floating ring and a fixing table are arranged on the floating assembly, when the valve seat compensates the offset of the butterfly plate, a gap is generated between the valve seat and the fixing table, and the side, away from the butterfly plate, of the outer ring of the floating ring is connected to the inner ring of the fixing table in a sliding mode. The problems that solid particles are deposited between the valve seat and the fixing table, sealing faces cannot make close contact, sealing is poor, and normal work of the butterfly plate is affected are solved, and the sealing effect is guaranteed when the valve seat in the two-way sealing butterfly valve carries out floating compensation on the butterfly plate.

Description

Technical Field

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

[0002] Bidirectional sealing butterfly valves are mainly used in the fields of petroleum, chemical industry, fertilizer, power station, metallurgy, papermaking, light industry, etc. As parts for cutting off and regulating gas, medium and other media on pipelines, they have bidirectional sealing functions; butterfly valves are divided into center-sealed butterfly valves, single-eccentric sealed butterfly valves, double-eccentric sealed butterfly valves and triple-eccentric sealed butterfly valves according to their structural forms; for example, Chinese patent CN202111108988.X discloses a three-eccentric bidirectional butterfly valve sealing structure; among them, the three-eccentric butterfly valve has three eccentric structures, the first eccentricity refers to the eccentric dimension between the valve stem axis and the radial sealing surface of the butterfly plate, that is, axial eccentricity, the second eccentricity refers to the eccentric dimension between the valve stem axis and the channel axis of the valve body, that is, radial eccentricity, and the third eccentricity refers to the valve seat seal and the channel axis of the valve body. There is an oblique cone angle , that is, angle eccentricity. Due to the existence of angle eccentricity, the butterfly plate is usually a right-angled oblique circular frustum, and its outer peripheral surface is an oblique circular frustum curved surface; when the existing three-eccentric butterfly valve is subjected to positive pressure, the eccentric torque and medium force cause the sealing ring to wedge into the valve seat, and the valve seat will not be displaced due to the action of the fixed platform. The eccentric torque and medium force will cause the butterfly plate to move in a direction that is conducive to sealing, thereby ensuring the positive sealing performance; when subjected to reverse pressure, the general three-eccentric butterfly valve will produce deformation of the butterfly plate that causes the sealing ring to separate from the sealing surface of the valve seat due to the action of the eccentric torque and medium force; at the same time, due to processing errors and wear and tear, there may be a certain gap between the shaft hole of the butterfly plate and the valve shaft. When subjected to reverse pressure, the butterfly plate may move to compensate for the gap. This movement will cause a certain separation between the sealing ring and the sealing surface of the valve seat, thereby failing to ensure the reverse sealing of the butterfly plate.

[0003] In view of the above problems, the prior art proposes a floating valve seat bidirectional metal sealed butterfly valve which continues the main structure of the three-eccentric bidirectional sealed butterfly valve, retains the advantages of the bidirectional sealed butterfly valve, such as the tighter it is closed, the short contact time of the sealing surface, and the less wear, and focuses on the sealing performance of the butterfly plate under reverse pressure when working under high pressure; in terms of structure, the traditional integrated structure of the valve seat and the valve body is improved, so that the valve seat is separated from the valve body, the valve seat can move in the valve body, and the movement of the valve seat can be adjusted by the floating bolt to ensure the sealing requirements under different pressure conditions; however, the above scheme also has some problems. The design of the floating valve seat usually relies on the precise fit between the valve seat and the fixed platform and the pressure exerted on the valve seat during the closing process. If solid particles are deposited between the valve seat and the fixed platform, the sealing surface may not be in close contact, resulting in poor sealing and affecting the normal operation of the butterfly plate.

[0004] Therefore, a bidirectional sealing butterfly valve is proposed to solve the problem that solid particles are deposited between the valve seat and the fixed platform, resulting in the inability of the sealing surface to make close contact, thus causing poor sealing and affecting the normal operation of the butterfly plate. Summary of the invention

[0005] The purpose of the present invention is to provide a bidirectional sealing butterfly valve to solve the problem that solid particles are deposited between the valve seat and the fixed platform, resulting in the sealing surface being unable to be in close contact, thus causing poor sealing and affecting the normal operation of the butterfly plate.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A two-way sealing butterfly valve comprises a valve body, a valve stem, a butterfly plate, a sealing ring, a pressure plate and a valve seat. The valve stem is installed in the valve body and connected to the butterfly plate. A step column structure is provided on the butterfly plate. The butterfly plate and the pressure plate are nested and installed by fasteners. The pressure plate clamps the sealing ring sleeved on the step column of the butterfly plate. The inner hole of the sealing ring is larger than the outer diameter of the step column on the butterfly plate. The valve seat is coaxially installed in the valve body. When the butterfly plate is in a closed state, the sealing ring fits the valve seat. A floating assembly is provided in the valve body. A floating ring and a fixing platform are provided on the floating assembly. The floating ring is installed on the end of the valve seat away from the butterfly plate, the fixed platform is installed in the valve body, and the fixed platform is located on the side of the valve seat away from the butterfly plate. When the valve seat compensates for the offset of the butterfly plate, a gap is generated between the valve seat and the fixed platform. The side of the outer ring of the floating ring away from the butterfly plate is slidably connected to the inner ring of the fixed platform, thereby avoiding the deposition of solid particles between the valve seat and the fixed platform, resulting in the sealing surface being unable to contact closely, thereby causing poor sealing and affecting the normal operation of the butterfly plate, thereby ensuring the sealing effect when the valve seat in the two-way sealing butterfly valve performs floating compensation on the butterfly plate.

[0008] Preferably, the floating assembly includes a floating bolt and a floating spring, the fixed platform is in the shape of a circular ring, and a plurality of floating grooves are evenly distributed on the circumference of the fixed platform, the plurality of floating bolts are respectively slidably connected in the plurality of floating grooves, the ends of the plurality of floating bolts close to the butterfly plate are threadedly connected to the valve seat, and the plurality of floating springs are respectively sleeved on the plurality of floating bolts, and the two ends of the plurality of floating springs are respectively connected to the end of the fixed platform close to the butterfly plate and the end of the valve seat away from the butterfly plate, thereby avoiding the deposition of solid particles between the valve seat and the fixed platform, resulting in the inability of the sealing surface to be in close contact, thereby causing poor sealing and affecting the normal operation of the butterfly plate, thereby ensuring the stability of the valve seat in the two-way sealing butterfly valve when performing floating compensation for the butterfly plate.

[0009] Preferably, an adjustment groove is coaxially opened in the fixed platform, the adjustment groove is in a circular ring shape, and the inner ring of the adjustment groove is connected to multiple floating grooves, and an adjusting gear ring is provided on a rotating sleeve in the adjustment groove. Adjustment gears are provided on the middle parts of multiple floating bolts, and multiple adjusting gears are meshed with the adjustment gear rings, which avoids the need for staff to adjust the floating bolts one by one when adjusting the floating amount of the valve seat, which is time-consuming and labor-intensive, resulting in excessive equipment downtime and other problems. The efficiency of adjusting the floating amount of the valve seat in the two-way sealing butterfly valve is ensured, and the problem of single or multiple floating bolts loosening due to water flow vibration during the operation of the two-way sealing butterfly valve is avoided.

[0010] Preferably, a locking groove is provided on the fixed platform, and the locking groove is connected to the inner ring of the adjusting groove. A locking gear is rotatably connected in the locking groove, and the locking gear is meshed with the adjusting gear ring. A slide groove is coaxially provided on the locking gear, and a locking pin is slidably connected in the slide groove. A movable toothed disk is installed on the end of the locking pin away from the butterfly plate, and a locking spring is coaxially sleeved on the locking pin, and both ends of the locking spring are respectively connected to the locking gear and the movable toothed disk, and a fixed toothed disk is installed on the end of the locking groove away from the butterfly plate, and the movable toothed disk is meshed with the fixed toothed disk, thereby avoiding the problem of multiple floating bolts loosening due to water flow vibration during the operation of the two-way sealing butterfly valve, and ensuring the stability of the valve seat in the two-way sealing butterfly valve during operation.

[0011] Preferably, a water-blocking groove is coaxially provided on the side of the floating ring away from the butterfly plate and in contact with the fixed platform. A water-blocking ring is provided on a rolling sleeve in the water-blocking groove. The cross-section of the water-blocking ring is circular, thereby avoiding the generation of a gap between the sliding floating ring and the fixed platform, which causes the medium and particulate matter to enter the gap between the valve seat and the fixed platform, further resulting in the inability of the sealing surface to be in close contact, thereby causing a poor seal and affecting the normal operation of the butterfly plate, thereby ensuring the sealing effect between the floating ring and the fixed platform when the valve seat in the bidirectional sealing butterfly valve performs floating compensation on the butterfly plate.

[0012] Preferably, a pressing surface is provided on one side of the water blocking groove close to the valve seat, the pressing surface is inclined to the inner ring of the fixed platform, and the pressing surface is also tangent to the water blocking groove, thereby avoiding the problem that when the two-way sealing butterfly valve is used in a high-pressure environment, the floating ring and the fixed platform are affected by the high pressure, causing the medium and particulate matter to penetrate between the valve seat and the fixed platform, thereby ensuring the sealing effect between the floating ring and the fixed platform when the two-way sealing butterfly valve is used in a high-pressure environment.

[0013] Preferably, a guide surface is provided on the end of the floating ring away from the valve seat, and the guide surface is arranged in an arc shape. The guide surface extends from the end of the floating ring away from the valve seat toward the central axis of the valve seat, thereby avoiding the problem that when the medium flushes the floating ring, the particles in the medium directly hit the floating ring, causing the floating ring to be worn or even damaged, thereby ensuring the service life of the floating ring in the two-way sealing butterfly valve and the flow rate of the medium flowing through the two-way sealing butterfly valve.

[0014] Preferably, the water blocking ring is made of rubber material, including at least any one of fluororubber, EPDM rubber and polyurethane rubber, wherein fluororubber has extremely strong water resistance, can resist water penetration, especially in high temperature and chemical medium environment, can maintain excellent sealing performance, at the same time, fluororubber has excellent wear resistance, suitable for application environments requiring frequent friction; EPDM rubber has very strong waterproof performance, can be exposed to water for a long time without losing elasticity, and is particularly suitable for use in extreme climates and humid environments. Although the wear resistance of EPDM rubber is not as good as that of polyurethane rubber, it still performs well in general low-wear environments and has good aging resistance; polyurethane rubber has good waterproof performance, can resist water penetration, and is suitable for environments with long-term contact with water. Due to its high hardness and density, polyurethane rubber has very good wear resistance and is usually used in application environments requiring high wear resistance; aging or damage of the water blocking ring after long-term contact with the medium is avoided, and at the same time, the water blocking ring is avoided from being worn during the floating adjustment process of the floating ring, resulting in the problem of reduced water blocking performance and service life of the water blocking ring, thereby ensuring the service life of the water blocking ring in the two-way sealing butterfly valve.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention provides a floating assembly in the valve body, and a floating ring and a fixed platform are provided on the floating assembly. The floating ring is installed on the end of the valve seat away from the butterfly plate, and the fixed platform is installed in the valve body. The outer ring of the floating ring is slidably connected to the inner ring of the fixed platform on the side away from the butterfly plate. When the valve seat compensates for the offset of the butterfly plate, the medium flowing in the reverse direction will not be able to enter the gap between the valve seat and the fixed platform, avoiding the problem that solid particles are deposited between the valve seat and the fixed platform, resulting in the sealing surface being unable to be in close contact and affecting the normal operation of the butterfly plate, thereby ensuring the sealing effect when the valve seat in the two-way sealing butterfly valve performs floating compensation on the butterfly plate.

[0017] 2. The present invention coaxially opens an adjusting groove in the fixed platform, the inner ring of the adjusting groove is connected with a plurality of floating grooves, a rotating sleeve is provided in the adjusting groove with an adjusting gear ring, and the middle parts of the plurality of floating bolts are provided with adjusting gears, and the plurality of adjusting gears are meshed with the adjusting gear ring. When one of the floating bolts rotates, the adjusting gear ring will drive the remaining floating bolts to rotate synchronously, thereby avoiding the need to adjust the floating bolts one by one when adjusting the floating amount of the valve seat. At the same time, the rotation of a single floating bolt will cause uneven force on the valve seat, resulting in wear at the connection between the floating ring and the fixed platform, thereby leading to reduced sealing and service life.

[0018] 3. The present invention provides a locking groove on a fixed platform, a locking gear is rotatably connected in the locking groove, a sliding groove is coaxially provided on the locking gear, a locking pin is slidably connected in the sliding groove, a movable toothed disk is installed on the end of the locking pin away from the butterfly plate, a locking spring is coaxially sleeved on the locking pin, a fixed toothed disk is installed on the end of the locking groove away from the butterfly plate, the movable toothed disk is meshed with the fixed toothed disk under the pressure of the locking spring, and the locking pin limits the rotation of the locking gear at this time, so as to avoid the problem of multiple floating bolts loosening due to medium flow vibration when the two-way sealing butterfly valve is running, thereby ensuring the stability of the valve seat in the two-way sealing butterfly valve during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a bidirectional sealing butterfly valve of the present invention;

[0020] Figure 2 It is a schematic diagram of the axial structure of the bidirectional sealing butterfly valve of the present invention;

[0021] Figure 3 For the present invention Figure 2 Sectional view at AA in the middle;

[0022] Figure 4 For the present invention Figure 3 A partial enlarged view of point B in the middle;

[0023] Figure 5 An exploded view of the bidirectional sealing butterfly valve of the present invention;

[0024] Figure 6 For the present invention Figure 5 A partial enlarged view of point C in the middle;

[0025] Figure 7 It is a schematic diagram of the installation of the locking gear, the movable toothed disc and the fixed toothed disc in the bidirectional sealing butterfly valve of the present invention;

[0026] Figure 8 For the present invention Figure 7 Cross-sectional view at DD in the middle.

[0027] In the figure: 1. valve body; 2. valve stem; 301. butterfly plate; 302. step column; 303. sealing ring; 304. pressure plate; 305. fastener; 4. valve seat; 501. floating ring; 502. fixed platform; 503. floating bolt; 504. floating spring; 505. floating groove; 601. adjusting groove; 602. adjusting gear ring; 603. adjusting gear; 701. locking groove; 702. locking gear; 703. slide groove; 704. locking pin; 705. movable toothed disc; 706. locking spring; 707. fixed toothed disc; 801. water blocking groove; 802. water blocking ring; 803. pressing surface; 804. guide surface. DETAILED DESCRIPTION

[0028] See also Figures 1 to 8 The present invention provides a bidirectional sealing butterfly valve, and the technical solution is as follows:

[0029] A two-way sealing butterfly valve comprises a valve body 1, a valve stem 2, a butterfly plate 301, a sealing ring 303, a pressure plate 304 and a valve seat 4. The valve stem 2 is installed in the valve body 1 and connected to the butterfly plate 301. A step column 302 structure is provided on the butterfly plate 301. The butterfly plate 301 and the pressure plate 304 are nested and installed by fasteners 305. The pressure plate 304 clamps the sealing ring 303 sleeved on the step column 302 of the butterfly plate 301. The inner hole of the sealing ring 303 is larger than the outer diameter of the step column 302 on the butterfly plate 301. The valve seat 4 is coaxially installed in the valve body 1. A floating assembly is provided in the valve body 1. The floating assembly is provided with a floating ring 501 and a fixed The fixed platform 502 and the floating ring 501 are installed on the end of the valve seat 4 away from the butterfly plate 301. The fixed platform 502 is installed in the valve body 1, and the fixed platform 502 is located on the side of the valve seat 4 away from the butterfly plate 301. When the butterfly plate 301 is in a closed and unloaded state, there is no gap between the valve seat 4 and the fixed platform 502. When the butterfly plate 301 is under positive pressure, the eccentric torque and the medium force make the sealing ring 303 wedge into the valve seat 4, and the valve seat 4 will not be displaced due to the action of the fixed platform 502. The eccentric torque and the medium force will make the butterfly plate 301 move in a direction that is conducive to sealing, thereby ensuring the positive sealing performance. When the three-eccentric butterfly valve is under reverse pressure, the eccentric torque Due to the effect of medium force, the butterfly plate 301 will deform and cause the sealing ring 303 to separate from the sealing surface of the valve seat 4. At the same time, due to processing errors, there may be a certain gap between the axial hole of the butterfly plate 301 and the valve shaft. When the butterfly plate 301 is under reverse pressure, it may move to compensate for the gap. This movement will cause the sealing ring 303 to separate from the sealing surface of the valve seat 4 to a certain extent, thereby failing to ensure the reverse sealing of the butterfly plate 301. When the bidirectional metal sealed butterfly valve of this scheme is under reverse pressure, the valve seat 4 swims in the opposite direction under the action of the floating component and the medium force, thereby compensating for the deviation caused by the deformation and movement of the butterfly plate 301, and the greater the medium force, the greater the displacement. , the tighter the sealing surface of the valve seat 4 fits against the sealing surface of the sealing ring 303, the more fully the "wedge effect" is exerted to ensure the reverse sealing performance; at the same time, since the outer ring of the floating ring 501 is slidably connected to the inner ring of the fixed platform 502 on the side away from the butterfly plate 301, the medium flowing in the reverse direction will not be able to enter the gap between the valve seat 4 and the fixed platform 502, thereby avoiding the problem of solid particles being deposited between the valve seat 4 and the fixed platform 502, resulting in the sealing surface not being able to be in close contact, thus causing poor sealing and affecting the normal operation of the butterfly plate 301, thereby ensuring the sealing effect of the valve seat 4 in the two-way sealing butterfly valve when performing floating compensation on the butterfly plate 301.

[0030] See also Figures 1 to 8The floating assembly includes a floating bolt 503 and a floating spring 504. The fixed platform 502 is annular, and a plurality of floating grooves 505 are evenly distributed on the circumference of the fixed platform 502. The plurality of floating bolts 503 are respectively slidably connected in the plurality of floating grooves 505. The ends of the plurality of floating bolts 503 close to the butterfly plate 301 are threadedly connected to the valve seat 4. The plurality of floating springs 504 are respectively sleeved on the plurality of floating bolts 503. The two ends of the plurality of floating springs 504 are respectively connected to the ends of the fixed platform 502 close to the butterfly plate 301 and the ends of the valve seat 4 away from the butterfly plate 301. When the bidirectional metal sealing butterfly valve is under reverse pressure, the valve seat 4 It moves in the opposite direction under the action of the floating spring 504 and the medium force, thereby compensating for the deviation caused by the deformation and movement of the butterfly plate 301, and the greater the medium force, the tighter the sealing surface of the valve seat 4 fits with the sealing surface of the sealing ring 303, thereby ensuring the reverse sealing performance. At the same time, the floating ring 501 closes the gap between the valve seat 4 and the fixed platform 502, thereby preventing solid particles from being deposited between the valve seat 4 and the fixed platform 502, resulting in the sealing surface being unable to be in close contact, thereby causing poor sealing and affecting the normal operation of the butterfly plate 301, thereby ensuring the stability of the valve seat 4 when the valve seat 4 in the two-way sealing butterfly valve performs floating compensation on the butterfly plate 301.

[0031] It is worth noting that an adjusting groove 601 is coaxially provided in the fixed platform 502, the adjusting groove 601 is annular, and the inner ring of the adjusting groove 601 is connected with multiple floating grooves 505, an adjusting gear ring 602 is rotatably provided in the adjusting groove 601, and an adjusting gear 603 is provided on the middle of multiple floating bolts 503, and multiple adjusting gears 603 are meshed with the adjusting gear ring 602. When the staff adjusts the floating amount of the valve seat 4, they only need to adjust one of the floating bolts 503 to drive the remaining floating bolts 503 to rotate through the adjusting gear ring 602. This avoids the situation in which the staff needs to adjust the floating bolts 503 one by one during conventional adjustments, which is time-consuming and laborious. At the same time, when a single floating bolt 503 rotates alone, it will cause uneven force on the valve seat 4, which will cause an offset between the floating ring 501 and the fixed platform 502 installed on the valve seat 4, causing wear at the connection between the floating ring 501 and the fixed platform 502, which will lead to a series of problems such as reduced sealing performance and service life of the floating ring 501. The sealing performance and service life of the floating ring 501 are guaranteed, and at the same time, the efficiency of adjusting the floating amount of the valve seat 4 in the two-way sealing butterfly valve is guaranteed.

[0032] It is also worth noting that a locking groove 701 is provided on the fixed platform 502, and the locking groove 701 is communicated with the inner ring of the adjusting groove 601. A locking gear 702 is rotatably connected in the locking groove 701, and the locking gear 702 is meshed with the adjusting gear ring 602. A sliding groove 703 is coaxially provided on the locking gear 702, and a locking pin 704 is slidably connected in the sliding groove 703. A movable toothed disc 705 is installed on the end of the locking pin 704 away from the butterfly plate 301, and a locking spring 706 is coaxially sleeved on the locking pin 704. The two ends of the locking spring 706 are respectively connected to the locking gear 702 and the movable toothed disc 705. The locking groove 701 is away from the butterfly plate 301. A fixed toothed disc 707 is installed on one end. In a normal state, the movable toothed disc 705 is subjected to the pressure of the locking spring 706 so that the movable toothed disc 705 is engaged with the fixed toothed disc 707. At this time, the locking pin 704 slidably connected in the slide groove 703 will limit the rotation of the locking gear 702, thereby avoiding the problem of multiple floating bolts being loosened due to water flow vibration when the two-way sealing butterfly valve is running, ensuring the stability of the valve seat 4 in the two-way sealing butterfly valve during operation, and at the same time avoiding the floating ring 501 being subjected to the vibration of the medium flow, which causes the floating ring 501 to frequently rub against the fixed platform 502, thereby ensuring the sealing and service life of the floating ring 501.

[0033] See also Figure 4 A water blocking groove 801 is coaxially provided on the side of the floating ring 501 that is away from the butterfly plate 301 and in contact with the fixed platform 502. A water blocking ring 802 is provided in a rolling sleeve in the water blocking groove 801. The cross section of the water blocking ring 802 is circular. The water blocking ring 802 is made of fluororubber material. The water blocking ring 802 moves with the movement of the floating ring 501. At the same time, due to its own material properties, the water blocking ring 802 is always close to the inner ring of the fixed platform 502, thereby avoiding the generation of a gap between the sliding floating ring 501 and the fixed platform 502, causing the medium and particles to enter the gap between the valve seat 4 and the fixed platform 502, further causing the sealing surface to be unable to be in close contact, thereby causing poor sealing and affecting the normal operation of the butterfly plate 301. The sealing effect between the floating ring 501 and the fixed platform 502 is ensured when the valve seat 4 in the two-way sealing butterfly valve performs floating compensation on the butterfly plate 301.

[0034] It is worth noting that a pressing surface 803 is provided on one side of the water blocking groove 801 close to the valve seat 4, the pressing surface 803 is inclined to the inner circle of the fixed platform 502, and the pressing surface 803 is also tangent to the water blocking groove 801. When the bidirectional metal sealed butterfly valve is subjected to reverse pressure, the pressure of the medium acts on the water blocking ring 802, and at this time the water blocking ring 802 will be tightly attached to the pressing surface 803 and the fixed platform 502. The greater the medium pressure, the tighter the water blocking ring 802 fits the pressing surface 803 and the fixed platform 502, thereby avoiding the problem that when the bidirectional sealed butterfly valve is used in a high-pressure environment, the floating ring 501 and the fixed platform 502 are affected by the high pressure, resulting in the medium and particulate matter penetrating between the valve seat 4 and the fixed platform 502, and ensuring the sealing effect between the floating ring 501 and the fixed platform 502 when the bidirectional sealed butterfly valve is used in a high-pressure environment.

[0035] It is also worth noting that a guide surface 804 is provided on the end of the floating ring 501 away from the valve seat 4. The guide surface 804 is arranged in an arc shape. The guide surface 804 extends from the end of the floating ring 501 away from the valve seat 4 toward the central axis direction of the valve seat 4. When the medium flows rapidly through the two-way sealed butterfly valve, the guide surface 804 can smoothly guide the medium to pass through the floating ring 501, thereby avoiding the problem that the particles in the medium directly hit the floating ring 501, causing the floating ring 501 to be worn or even damaged, thereby ensuring the service life of the floating ring 501 in the two-way sealed butterfly valve and at the same time ensuring the flow rate of the medium flowing through the two-way sealed butterfly valve.

[0036] While working, see Figures 1 to 8, when the butterfly plate 301 is in a closed and unloaded state, there is no gap between the valve seat 4 and the fixed platform 502; when subjected to positive pressure, the eccentric torque and the medium force cause the sealing ring 303 to wedge into the valve seat 4, and the valve seat 4 will not be displaced due to the action of the fixed platform 502, and the eccentric torque and the medium force will cause the butterfly plate 301 to move in a direction that is conducive to sealing, thereby ensuring the positive sealing performance; when subjected to reverse pressure, generally, due to the eccentric torque and the medium force of the three-eccentric butterfly valve, the butterfly plate 301 will produce deformation that causes the sealing ring 303 to separate from the sealing surface of the valve seat 4; at the same time, due to processing errors, there may be a certain gap between the axial hole of the butterfly plate 301 and the valve shaft. When subjected to reverse pressure, the butterfly plate 301 may move to compensate for the gap, and this movement will cause a certain separation of the sealing ring 303 from the sealing surface of the valve seat 4, thereby The reverse sealing of the butterfly plate 301 cannot be guaranteed; when the bidirectional metal sealed butterfly valve of this scheme is subjected to reverse pressure, the valve seat 4 swims in the reverse direction under the action of the floating assembly and the medium force, thereby compensating for the offset caused by the deformation and movement of the butterfly plate 301, and the greater the medium force, the tighter the sealing surface of the valve seat 4 fits the sealing surface of the sealing ring 303, giving full play to the "wedge effect" to ensure the reverse sealing performance; at the same time, the outer ring of the floating ring 501 is slidably connected to the inner ring of the fixed platform 502 on the side away from the butterfly plate 301, avoiding the deposition of solid particles between the valve seat 4 and the fixed platform 502, resulting in the sealing surface being unable to be in close contact, thereby causing poor sealing and affecting the normal operation of the butterfly plate 301, thereby ensuring the sealing effect of the valve seat 4 in the bidirectional sealed butterfly valve when performing floating compensation on the butterfly plate 301.

[0037] It is worth noting that when the staff adjusts the floating amount of the valve seat 4, pressure is applied to the movable toothed disc 705. At this time, the locking pin 704 moves toward the direction of the butterfly plate 301, and the locking spring 706 is compressed. At the same time, the movable toothed disc 705 disengages from the engagement limit of the fixed toothed disc 707. At this time, the staff applies torque to the fixed toothed disc 707. When the locking pin 704 rotates, it drives the locking gear 702 to rotate. At the same time, the ring gear 602 is adjusted to drive multiple floating bolts 503 to rotate. Only the rotation angle of the movable toothed disc 705 is required to drive the remaining floating bolts 503 to rotate by adjusting the ring gear 602. After adjusting to the specified position, the pressure applied to the movable toothed disc 705 is released. At this time, the locking spring 706 releases the pressure and pushes the movable toothed disc 705 to move toward the fixed toothed disc 707 until the movable toothed disc 705 is engaged with the fixed toothed disc 707.

[0038] It is also worth noting that, due to its own material properties, when the water blocking ring 802 moves with the movement of the floating ring 501, the water blocking ring 802 is limited by the water blocking groove 801 and is always close to the inner ring of the fixed platform 502, thereby avoiding the generation of a gap between the sliding floating ring 501 and the fixed platform 502, causing the medium and particles to enter the gap between the valve seat 4 and the fixed platform 502. When the bidirectional metal sealing butterfly valve is reversely pressurized, the pressure of the medium acts on the water blocking ring 802, and the water blocking ring 802 will be tightly attached to the pressing surface 803 and the fixed platform 502. The greater the medium pressure, the tighter the water blocking ring 802 fits against the pressing surface 803 and the fixed platform 502, thereby avoiding the problem that when the two-way sealing butterfly valve is used in a high-pressure environment, the floating ring 501 and the fixed platform 502 are affected by the high pressure, causing the medium and particles to penetrate between the valve seat 4 and the fixed platform 502; more noteworthy is that when the medium flows quickly through the two-way sealing butterfly valve, the arc-shaped guide surface 804 can smoothly guide the medium to pass through the floating ring 501, thereby avoiding the problem that the particles in the medium directly hit the floating ring 501, causing the floating ring 501 to be worn or even damaged.

[0039] A specific implementation mode of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the implementation mode described above; for those skilled in the art, various changes, modifications, substitutions and variations of these implementation modes without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. A two-way sealing butterfly valve, characterized in that: The invention comprises a valve body (1), a valve stem (2), a butterfly plate (301), a sealing ring (303), a pressure plate (304) and a valve seat (4); the valve stem (2) is installed in the valve body (1) and connected to the butterfly plate (301); a step column (302) structure is provided on the butterfly plate (301); the butterfly plate (301) and the pressure plate (304) are nested and installed via a fastener (305); the pressure plate (304) clamps the sealing ring (303) sleeved on the step column (302) of the butterfly plate (301); the inner hole of the sealing ring (303) is larger than the outer diameter of the step column (302) on the butterfly plate (301); the valve seat (4) is coaxially installed in the valve body (1); the butterfly plate (301) is in a closed position; In the closed state, the sealing ring (303) fits against the valve seat (4), a floating assembly is provided in the valve body (1), and a floating ring (501) and a fixed platform (502) are provided on the floating assembly. The floating ring (501) is installed on the end of the valve seat (4) away from the butterfly plate (301), and the fixed platform (502) is installed in the valve body (1), and the fixed platform (502) is located on the side of the valve seat (4) away from the butterfly plate (301). When the valve seat (4) compensates for the displacement of the butterfly plate (301), a gap is generated between the valve seat (4) and the fixed platform (502), and the outer ring of the floating ring (501) is slidably connected to the inner ring of the fixed platform (502) on the side away from the butterfly plate (301).

2. A two-way sealing butterfly valve according to claim 1, characterized in that: The floating assembly includes a floating bolt (503) and a floating spring (504); the fixed platform (502) is in a circular ring shape; a plurality of floating grooves (505) are evenly distributed on the circumference of the fixed platform (502); the plurality of floating bolts (503) are respectively slidably connected in the plurality of floating grooves (505); one end of the plurality of floating bolts (503) close to the butterfly plate (301) is threadedly connected to the valve seat (4); the plurality of floating springs (504) are respectively sleeved on the plurality of floating bolts (503); and two ends of the plurality of floating springs (504) are respectively connected to one end of the fixed platform (502) close to the butterfly plate (301) and one end of the valve seat (4) away from the butterfly plate (301).

3. A two-way sealing butterfly valve according to claim 2, characterized in that: An adjusting groove (601) is coaxially provided in the fixed platform (502). The adjusting groove (601) is in a circular ring shape, and the inner ring of the adjusting groove (601) is connected to a plurality of floating grooves (505). An adjusting gear ring (602) is rotatably provided in the adjusting groove (601). An adjusting gear (603) is provided on the middle of the plurality of floating bolts (503), and the plurality of adjusting gears (603) are meshed with the adjusting gear ring (602).

4. A two-way sealing butterfly valve according to claim 3, characterized in that: The fixing platform (502) is provided with a locking groove (701), the locking groove (701) is communicated with the inner ring of the adjusting groove (601), a locking gear (702) is rotatably connected in the locking groove (701), the locking gear (702) is meshed with the adjusting gear ring (602), a sliding groove (703) is coaxially provided on the locking gear (702), a locking pin (704) is slidably connected in the sliding groove (703), and the locking pin (704) is rotatably connected in the adjusting gear ring (602). 04) A movable toothed disc (705) is installed on the end away from the butterfly plate (301), a locking spring (706) is coaxially sleeved on the locking pin (704), and the two ends of the locking spring (706) are respectively connected to the locking gear (702) and the movable toothed disc (705), and a fixed toothed disc (707) is installed on the end of the locking groove (701) away from the butterfly plate (301), and the movable toothed disc (705) is meshed with the fixed toothed disc (707).

5. A two-way sealing butterfly valve according to claim 2, characterized in that: A water blocking groove (801) is coaxially provided on the side of the floating ring (501) away from the butterfly plate (301) and in contact with the fixed platform (502). A water blocking ring (802) is provided in a rolling sleeve in the water blocking groove (801). The cross section of the water blocking ring (802) is circular.

6. A two-way sealing butterfly valve according to claim 5, characterized in that: A pressing surface (803) is provided on one side of the water blocking groove (801) close to the valve seat (4), the pressing surface (803) is inclined to the inner circle of the fixing platform (502), and the pressing surface (803) is also tangent to the water blocking groove (801).

7. A two-way sealing butterfly valve according to claim 2, characterized in that: A guide surface (804) is provided on the end of the floating ring (501) away from the valve seat (4); the guide surface (804) is arranged in an arc shape; the guide surface (804) extends from the end of the floating ring (501) away from the valve seat (4) towards the central axis of the valve seat (4).

8. A two-way sealing butterfly valve according to claim 6, characterized in that: The water blocking ring (802) is made of rubber material, including at least any one of fluororubber, EPDM rubber and polyurethane rubber.

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