Triple offset bi-directional sealing butterfly valve

Abstract

The present disclosure relates to a three-eccentric bidirectional sealing butterfly valve, comprising: a valve body, a channel for medium flow being opened in the valve body along a first direction; a valve rod, the valve rod being arranged in the valve body along a second direction, an eccentric part being arranged on the valve rod in the channel and being eccentric to the rotation axis of the valve rod; a butterfly plate, the butterfly plate being fixedly arranged on the eccentric part; and a valve seat, the valve seat being fixedly arranged in the channel and being used for sealing and cutting off the channel when the butterfly plate rotates with the valve rod. Through the above technical scheme, the eccentric part is arranged on the valve rod in the channel of the valve body, so that when the butterfly plate rotates with the valve rod, the eccentric part forms a cam effect, the butterfly plate can be swung and tightly abuts against the valve seat, the sealing between the butterfly plate and the valve seat is realized, the valve body channel is cut off, and the sealing between the butterfly plate and the valve seat is improved.

Description

Technical Field

[0001] This disclosure relates to the field of valve technology, and more specifically, to a triple-eccentric bidirectional sealing butterfly valve. Background Technology

[0002] In related technologies, when the medium flows in the forward direction in a triple eccentric butterfly valve, the valve stem bends towards the sealing surface, and the deformation of the valve stem helps to improve the sealing effect. However, when the medium flows in the reverse direction, the medium will act on the butterfly plate, that is, the valve stem will bend and rotate away from the sealing surface, resulting in a decrease in the sealing force between the butterfly plate and the sealing surface, i.e., the reverse sealing effect is poor. Summary of the Invention

[0003] The purpose of this disclosure is to provide a triple-eccentric bidirectional sealing butterfly valve that enhances the seal when the medium flows in reverse, thereby at least partially solving the problems in the related art.

[0004] To achieve the above objectives, this disclosure provides a triple-eccentric bidirectional sealing butterfly valve, comprising: a valve body having a channel for medium flow along a first direction; a valve stem passing through and rotatably disposed in the valve body along a second direction, wherein an eccentric element is disposed on the valve stem located within the channel and is eccentric to the rotation axis of the valve stem; a butterfly plate fixedly disposed on the eccentric element; and a valve seat fixedly disposed within the channel, for sealing and cutting off the channel when the butterfly plate rotates with the valve stem.

[0005] Optionally, the eccentric component is integrally formed with the valve stem, and the butterfly plate is fixedly connected to the eccentric component by fasteners.

[0006] Optionally, the eccentric component includes an eccentric sleeve fitted onto the valve stem within the channel. The eccentric sleeve is configured to rotate relative to the valve stem in the circumferential direction. The eccentric portion of the eccentric sleeve is provided with a connecting sleeve for connecting to the butterfly plate. The butterfly plate is provided with a snap-fit ​​portion, and the valve seat is provided with a mating portion that engages with the snap-fit ​​portion. The eccentric component also includes a transmission mechanism, which is configured to drive the eccentric sleeve to rotate when the valve stem rotates, so that the butterfly plate and the valve seat abut against and seal the channel, and drive the snap-fit ​​portion to engage with the mating portion.

[0007] Optionally, the channel is provided with a first mounting position and a second mounting position at intervals along a first direction. The valve seat includes a fixing ring, a pressure plate and a sealing ring. The sealing ring and the pressure plate are located at the first mounting position. The fixing ring is located at the second mounting position and is used to press the pressure plate and the sealing ring together. The sealing ring is configured such that when the butterfly plate rotates, the butterfly plate abuts against the sealing ring to seal and cut off the channel.

[0008] Optionally, the snap-fit ​​part includes a first receiving groove extending along the length direction of the butterfly plate. The first receiving groove is provided with a snap-fit ​​plate that can be raised and lowered along the first receiving groove. The snap-fit ​​plate is connected to the transmission mechanism. The mating part is a snap-fit ​​groove that mates with the snap-fit ​​plate. When the butterfly plate rotates and abuts against the sealing ring for sealing, the snap-fit ​​plate extends out of the first receiving groove and snaps with the snap-fit ​​groove.

[0009] Optionally, the first receiving groove penetrates the butterfly plate, and the butterfly plate has a first connecting groove extending in a first direction. The first connecting groove is used to connect the first receiving groove and the connecting sleeve. A first support is provided in the first connecting groove, and a positive and negative screw is rotatably provided on the first support. The positive and negative thread portions of the positive and negative screws extend into the first receiving groove respectively. There are two locking plates and two locking grooves. The two locking plates are threadedly connected to the positive and negative thread portions of the positive and negative screws respectively. The positive and negative screws are connected to the transmission mechanism so that when the valve stem rotates to drive the butterfly plate to rotate and abut against the sealing ring for sealing, the transmission mechanism drives the positive and negative screws to rotate so that the locking plates engage with the locking grooves.

[0010] Optionally, the transmission mechanism includes a first transmission gear, a second transmission gear, a third transmission gear, and a clutch. The first transmission gear is disposed on the positive and negative lead screws, and the second transmission gear is rotatably disposed within the eccentric sleeve. The second transmission gear is connected to the first transmission gear. The valve stem has a reduced diameter section, and the third transmission gear is sleeved on the reduced diameter section and used for connection with the second transmission gear. The clutch is disposed between the eccentric sleeve and the valve stem. The clutch includes a first position and a second position. When the clutch is in the first position, the eccentric sleeve and the valve stem rotate synchronously to make the butterfly plate abut against the sealing ring for sealing. When the clutch is in the second position, the eccentric sleeve and the valve stem rotate relative to each other to make the locking plate engage with the locking groove.

[0011] Optionally, the clutch includes a sliding block, a connecting rod, and a guide plate. The lower part of the valve stem is provided with a second receiving groove for accommodating the guide plate and the connecting rod. The rotation axis of the connecting rod is offset from the rotation axis of the valve stem. The guide plate has an arc-shaped guide slide, within which are a first guide groove, a second guide groove, and a first inclined surface connecting the first and second guide grooves. The first guide groove is higher than the second guide groove. The curvature center of the guide slide is located on the rotation axis of the valve stem. The connecting rod is configured such that its bottom end can slide along the guide slide. The eccentric sleeve has a fan-shaped groove, within which is a first inclined surface. The second inclined surface has a stop at its first end and a limiting hole at its second end. The first end of the second inclined surface is higher than the second end of the second inclined surface. The sliding block is located at the top of the connecting rod and is configured to slide along the fan-shaped groove. When the clutch is in the first position, the sliding block slides along the second inclined surface from the limiting hole toward the stop and abuts against the stop. The bottom end of the connecting rod slides in the first guide groove. When the clutch is in the second position, the sliding block slides along the second inclined surface from the stop toward the limiting hole and enters the limiting hole. The bottom end of the connecting rod enters the second guide groove from the first guide groove and slides in the second guide groove.

[0012] Optionally, the bottom end of the connecting rod is provided with a ball bearing, the ball bearing being configured to slide along the guide rail; and / or The clutch also includes a support rod, which is fixedly disposed at the bottom end of the guide plate.

[0013] Optionally, the sealing ring includes multiple metal layers and multiple graphite layers, which are arranged alternately.

[0014] Optionally, the total number of metal layers and graphite layers is not less than five, the thickness of the metal layer is 1.2mm to 1.6mm, and the thickness of the graphite layer is 0.6mm to 0.8mm.

[0015] The above technical solution involves installing an eccentric component on the valve stem within the valve body's passage. As the butterfly plate rotates with the valve stem, the eccentric component creates a cam effect, causing the butterfly plate to swing and press against the valve seat, achieving a seal between the butterfly plate and the valve seat. This effectively cuts off the valve body passage and improves the sealing performance between the butterfly plate and the valve seat. In particular, when the medium flows in the opposite direction, the eccentric component solves the problem of reduced sealing force between the butterfly plate and the valve seat caused by the valve stem bending and rotating due to the impact force of the medium.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the first embodiment of the triple-eccentric bidirectional sealing butterfly valve provided in the exemplary embodiments of this disclosure; Figure 2 yes Figure 1 A magnified view of part A in the middle; Figure 3 This is a schematic diagram of a second embodiment of the triple-eccentric bidirectional sealing butterfly valve provided in the exemplary embodiments of this disclosure; Figure 4 This is a schematic diagram of the assembly of the valve stem, butterfly plate and transmission mechanism provided in an exemplary embodiment of this disclosure; Figure 5 This is a schematic diagram of a clutch provided in an exemplary embodiment of this disclosure.

[0018] Explanation of reference numerals in the attached figures 1-Valve body; 11-Passway; 111-First mounting position; 112-Second mounting position; 12-Upper shaft hole; 13-Packing clearance; 14-Upper stepped surface; 15-Packing pad; 16-Packing; 17-Packing sleeve; 18-Packing gland; 19-Lower shaft hole; 2-Valve stem; 20-Reduced diameter section; 21-Eccentric part; 22-Eccentric sleeve; 23-Connecting sleeve; 24-Sector groove; 241-Second inclined surface; 242-Stop part; 243-Limiting hole; 25-Annular groove; 26-Split ring; 27-Thrust bearing; 28-Thrust pad; 29-Second receiving groove; 3-Butterfly plate; 31-Snap-fit ​​part; 311-First receiving groove; 312-Snap-fit ​​plate; 32-First connecting groove ; 33-First support; 34-Positive and negative lead screws; 4-Valve seat; 40-Mating part; 401-Snap-fit ​​groove; 41-Fixing ring; 42-Pressure plate; 43-Sealing ring; 431-Metal layer; 432-Graphite layer; 44-Sealing gasket; 5-Transmission mechanism; 51-First transmission gear; 52-Second transmission gear; 53-Third transmission gear; 54-Clutch; 55-Sliding block; 56-Connecting rod; 561-Ball; 57-Guide plate; 58-Guide slide; 581-First guide groove; 582-Second guide groove; 583-First inclined surface; 59-Support rod; 6-Packaging clamping mechanism; 61-Stud; 62-Butterfly spring; 63-Nut; 7-Lower valve cover. Detailed Implementation

[0019] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0020] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" refer to the outline of the part itself, and the first direction can be referenced. Figure 1 In the X direction, the second direction can be referenced. Figure 1 Reference for valve stem rotation axis in the Y direction Figure 1 M-line, reference for the rotation axis of the eccentric component Figure 1 The N-line. Furthermore, it should be noted that the terms used, such as "first," "second," etc., are used to distinguish one element from another and do not indicate sequence or importance. Additionally, in the description referring to the accompanying drawings, the same reference numerals in different drawings denote the same element.

[0021] like Figures 1-5 As shown, this disclosure provides a triple-eccentric bidirectional sealing butterfly valve, comprising: a valve body 1, a valve stem 2, a butterfly plate 3, and a valve seat 4. The valve body 1 has a channel 11 for medium flow along a first direction; the valve stem 2 passes through and is rotatably mounted on the valve body 1 along a second direction, the first and second directions being perpendicular to each other. An eccentric member 21, eccentric to the rotation axis of the valve stem 2, is provided on the valve stem 2 located within the channel 11; the butterfly plate 3 is fixedly mounted on the eccentric member 21; and the valve seat 4 is fixedly mounted within the channel 11, used to abut against the butterfly plate 3 and seal and cut off the channel 11 when the butterfly plate 3 rotates with the valve stem 2.

[0022] Through the above technical solution, by setting an eccentric member 21 on the valve stem 2 in the channel 11 of the valve body 1, when the butterfly plate 3 rotates with the valve stem 2, the eccentric member 21 will form a cam effect, allowing the butterfly plate 3 to swing and press against the valve seat 4, achieving a seal between the butterfly plate 3 and the valve seat 4, thereby cutting off the valve body 1 and improving the sealing performance between the butterfly plate 3 and the valve seat 4. In particular, when the medium flows in reverse, the setting of the eccentric member 21 can solve the problem of the valve stem 2 bending and rotating due to the impact force of the medium, which leads to a decrease in the sealing force between the butterfly plate 3 and the valve seat 4.

[0023] In some feasible embodiments, the eccentric component 21 is integrally formed with the valve stem 2, and the butterfly plate 3 is fixedly connected to the eccentric component 21 by fasteners. The eccentric component 21 can be an arc-shaped protrusion, and the rotation center of the arc-shaped protrusion is eccentrically set with the valve stem 2. The butterfly plate 3 is provided with mounting holes, and the fasteners can be, for example, screws passing through the mounting holes and fixedly connected to the eccentric component 21. The integral forming of the eccentric component 21 with the valve stem 2 can further improve the connection strength between the eccentric component 21 and the valve stem 2. When the medium flows in reverse, the eccentric component 21 and the butterfly plate 3 can withstand the impact force of the medium with sufficient strength, thereby enabling the butterfly plate 3 and the valve seat 4 to have a stable sealing connection.

[0024] In some feasible embodiments, the eccentric component 21 includes an eccentric sleeve 22 fitted onto the valve stem 2 within the channel 11. The eccentric sleeve 22 is configured to rotate relative to the valve stem 2. For example, the eccentric sleeve 22 can be rotatably connected to the valve stem 2 via a bearing connection. The rotation axis of the eccentric sleeve 22 is eccentrically set with respect to the rotation axis of the valve stem 2. A connecting sleeve 23 for connecting to the butterfly plate 3 is provided on the eccentric portion of the eccentric sleeve 22. For example, the connecting sleeve 23 is partially fitted onto the outer periphery of the eccentric sleeve 22 and is fixedly connected to the eccentric sleeve 22 by fasteners. This allows the butterfly plate 3 to be fixedly connected to the eccentric sleeve 22, so that the butterfly plate 3 can rotate synchronously when the eccentric sleeve 22 rotates. To improve the stability of the sealing connection between the butterfly plate 3 and the valve seat 4, in some feasible embodiments, the butterfly plate 3 is provided with a snap-fit ​​part 31, and the valve seat 4 is provided with a mating part 40 that cooperates with the snap-fit ​​part 31. The eccentric member 21 is also provided with a transmission mechanism 5. The transmission mechanism 5 is configured to drive the eccentric sleeve 22 to rotate when the valve stem 2 rotates so that the butterfly plate 3 and the valve seat 4 abut against the sealing channel 11 and drive the snap-fit ​​part 31 to snap against the mating part 40. In this way, through the snap-fit ​​cooperation between the snap-fit ​​part 31 on the butterfly plate 3 and the mating part 40 on the valve seat 4, the sealing stability between the butterfly plate 3 and the valve seat 4 can be improved after the butterfly plate 3 and the valve seat 4 abut against the sealing channel 11, so as to avoid the impact force of the medium on the butterfly plate 3 and the seal failure.

[0025] like Figure 2 As shown, a first mounting position 111 and a second mounting position 112 are provided at intervals along a first direction within the channel 11. The first mounting position 111 can be constructed as a first stepped annular groove, and the second mounting position 112 can be constructed as a second stepped annular groove. The valve seat 4 includes a fixing ring 41, a pressure plate 42, and a sealing ring 43. The sealing ring 43 and the pressure plate 42 are located at the first mounting position 111, that is, the sealing ring 43 and the pressure plate 42 are located within the first stepped annular groove, and the sealing ring 43 is oriented towards the valve stem 2. The sealing ring 43 is an annular sealing ring, and the inner ring of the sealing ring 43 forms an inclined surface. The inclined surface is used to mate with the outer contour of the butterfly plate 3, so that the butterfly plate 3 and the valve seat 43 can fit together. When the sealing ring 43 abuts, it can be squeezed to form a seal to cut off the channel 11. The pressure plate 42 can be a ring plate. The fixing ring 41 is located at the second mounting position 112 and is used to press the pressure plate 42 and the sealing ring 43. The fixing ring 41 can also be a ring plate. The fixing ring 41 is provided with a mounting threaded hole, and a bolt is installed in the threaded hole. The outer circumference of the fixing ring 41 is fixedly connected to the second stepped ring groove. Tighten the bolt in the threaded hole of the fixing ring 41 so that the bolt can squeeze the pressure plate 42 so that the sealing ring 43 can be fixed in the first stepped ring groove. Thus, when the butterfly plate 3 rotates, the butterfly plate 3 and the sealing ring 43 abut and seal to cut off the channel 11.

[0026] In some feasible embodiments, the sealing ring 43 includes multiple metal layers 431 and multiple graphite layers 432, which are arranged alternately. The two outermost layers are both metal layers 431, which can be made of stainless steel. The inner plane of the multi-layer sealing ring 43 is pressed and sealed with the sealing gasket 44, and the outer plane of the multi-layer sealing ring 43 is abutted and fixed with the pressure plate 42. Using the multi-layer sealing ring 43, a hard seal with the butterfly plate 3 is achieved, which helps to improve the sealing effect.

[0027] Optionally, the total number of metal layer 431 and graphite layer 432 is not less than five layers, the thickness of metal layer 431 is 1.2 to 1.6 mm, and the thickness of graphite layer 432 is 0.6 mm to 0.8 mm.

[0028] When the butterfly plate 3 rotates and abuts against the multi-layer sealing ring 43 to achieve a seal, the engagement of the fixing ring 41 with the second-step annular groove prevents the sealing gasket 44, multi-layer sealing ring 43, and pressure plate 42 from axially dislodging. The fixing ring 41 and pressure plate 42 are fixed to prevent axial movement of the pressure plate 42, which would affect the sealing performance of the sealing gasket 44 and multi-layer sealing ring 43. Furthermore, the fixing ring 41, pressure plate 42, and sealing ring 43 are detachably mounted within the channel 11, allowing them to be disassembled sequentially for repair and replacement should any component in the valve seat 4 be damaged.

[0029] In some feasible ways, such as Figure 3 and Figure 4 As shown, the snap-fit ​​part 31 includes a first receiving groove 311 extending along the length direction of the butterfly plate 3, where the length direction of the butterfly plate 3 refers to the second direction. The first receiving groove 311 is provided with a snap-fit ​​plate 312 that can be raised and lowered along the first receiving groove 311. The snap-fit ​​plate 312 is connected to the transmission mechanism 5. The mating part 40 is a snap-fit ​​groove 401 that mates with the snap-fit ​​plate 312. When the butterfly plate 3 rotates and abuts against the sealing ring 43 for sealing, the transmission mechanism 5 drives the snap-fit ​​plate 312 to extend out of the first receiving groove 311 and snap-fit ​​with the snap-fit ​​groove 401.

[0030] Optionally, the first receiving groove 311 penetrates the butterfly plate 3. The butterfly plate 3 is provided with a first connecting groove 32 extending in a first direction. The first connecting groove 32 is used to connect the first receiving groove 311 and the connecting sleeve 23. The first connecting groove 32 is provided with a first support 33. A positive and negative screw 34 is rotatably provided on the first support 33. The positive and negative threaded parts of the positive and negative screw 34 extend into the first receiving groove 311 respectively. There are two locking plates 312 and two locking grooves 401. The two locking plates 312 are threadedly connected to the positive and negative threaded parts of the positive and negative screw 34 respectively. The positive and negative screw 34 is connected to the transmission mechanism 5 so that when the valve stem 2 rotates to drive the butterfly plate 3 to rotate and abut against the sealing ring 43 for sealing, the transmission mechanism 5 drives the positive and negative screw 34 to rotate so that the locking plates 312 are locked with the locking grooves 401.

[0031] like Figure 4 and Figure 5 As shown, the transmission mechanism 5 includes a first transmission gear 51, a second transmission gear 52, a third transmission gear 53, and a clutch 54. The first transmission gear 51 is disposed on the positive and negative lead screw 34. The second transmission gear 52 is rotatably disposed inside the eccentric sleeve 22 and is connected to the first transmission gear 51. The valve stem 2 is provided with a reduced diameter section 20. The third transmission gear 53 is sleeved on the reduced diameter section 20 and is used to connect to the second transmission gear 52. The clutch 54 is disposed between the eccentric sleeve 22 and the valve stem 2. The clutch 54 includes a first position and a second position. When the clutch 54 is in the first position, the eccentric sleeve 22 and the valve stem 2 rotate synchronously so that the butterfly plate 3 abuts and seals the sealing ring 43. When the clutch 54 is in the second position, the eccentric sleeve 22 and the valve stem 2 rotate relative to each other so that the butterfly plate 3 abuts and seals the sealing ring 43 before driving the snap-fit ​​plate 312 to snap into the snap-fit ​​groove 401.

[0032] Specifically, the clutch 54 may include a sliding block 55, a connecting rod 56, and a guide plate 57. The lower part of the valve stem 2 is provided with a second receiving groove 29, which is used to receive the guide plate 57 and the connecting rod 56. The rotation axis of the connecting rod 56 is offset from the rotation axis of the valve stem 2. The guide plate 57 is provided with an arc-shaped guide slide 58. The guide slide 58 contains a first guide groove 581, a second guide groove 582, and a first inclined surface 583 connecting the first guide groove 581 and the second guide groove 582. The first guide groove 581 is higher than the second guide groove 582. The curvature center of the guide slide 58 is located on the rotation axis of the valve stem 2. The connecting rod 56 is configured such that its bottom end can slide along the guide slide 58. The eccentric sleeve 22 contains a fan-shaped groove 24, and the fan-shaped groove 24 contains a second inclined surface 283. 41. The first end of the second inclined surface 241 is provided with a stop portion 242 and the second end is provided with a limiting hole 243. The first end of the second inclined surface 241 is higher than the second end of the second inclined surface 241. The sliding block 55 is provided at the top of the connecting rod 56 and is configured to slide along the fan-shaped groove 24. When the clutch 54 is in the first position, the sliding block 55 slides along the second inclined surface 241 from the limiting hole 243 toward the stop portion 242 and abuts against the stop portion 242. The bottom end of the connecting rod 56 slides in the first guide groove 581. When the clutch 54 is in the second position, the sliding block 55 slides along the second inclined surface 241 from the stop portion 242 toward the limiting hole 243 and enters the limiting hole 243. The bottom end of the connecting rod 56 enters the second guide groove 582 from the first guide groove 581 and slides in the second guide groove 582.

[0033] To facilitate the sliding of the connecting rod 56 within the guide slide 58, the cross-section of the guide slide 58 can be U-shaped, and the bottom end of the connecting rod 56 is provided with a ball bearing 561, which can slide along the trajectory of the guide slide 58.

[0034] In some feasible embodiments, to facilitate support of the guide plate 57, the clutch 54 also includes a support rod 59, which is fixedly disposed at the bottom end of the guide plate 57. A lower valve cover 7 is installed on the lower side of the valve body 1, and the lower end of the valve stem 2 extends into the lower shaft hole 19 and forms a rotational engagement with the lower shaft hole 19. A support rod 59 is fixedly connected to the lower valve cover 7, and the support rod 59 extends into the valve stem 2.

[0035] It is understandable that, in addition to the above-mentioned structure, the triple-eccentric bidirectional sealing butterfly valve also includes some other essential structures. For example, an upper shaft hole 12 is formed on the upper side of the valve body 1, the upper side of the valve stem 2 is rotatably connected in the upper shaft hole 12, a packing gap 13 is formed on the upper side of the valve body 1 above the upper shaft hole 12, an upper stepped surface 14 is formed between the packing gap 13 and the upper shaft hole 12, a packing pad 15 is provided on the upper stepped surface 14 of the valve body 1, a packing 16 is provided on the valve body 1 above the packing pad 15, a packing sleeve 17 is provided on the valve body 1 above the packing 16, a packing gland 18 is provided on the valve body 1 above the packing sleeve 17, and a packing clamping mechanism 6 is provided on the valve body 1 above the packing gland 18, which causes the packing gland 18 to clamp the packing sleeve 17.

[0036] The packing clamping mechanism 6 may include a stud 61, a butterfly spring 62, and a nut 63. The stud 61 passes through the packing sleeve 17 and is fixedly connected to the valve body 1. The nut 63 is threaded onto the upper end of the stud 61. The butterfly spring 62 is located between the nut 63 and the packing gland 18. The butterfly spring 62 improves the flexibility of the packing clamping mechanism 6. When the nut 63 is tightened, the butterfly spring 62 stores elastic potential energy, causing the packing 16 to deform laterally and adhere tightly to the valve stem 2. When the butterfly valve is under high temperature or alternating stress conditions, the preload of the packing clamping mechanism 6 relaxes. Under the action of the butterfly spring 62, the preload of the packing clamping mechanism 6 can be continuously compensated, improving the sealing performance at the packing sleeve 17.

[0037] The lower end of the valve stem 2 is provided with an annular groove 25. The valve stem 2 is located in the annular groove 25 and fitted with a split ring 26. A thrust bearing 27 is also fitted on the lower side of the valve stem 2, with the lower side of the thrust bearing 27 protruding into the annular groove 25. The split ring 26 is embedded in the inner hole of the thrust bearing 27. A lower shaft hole 19 is provided on the lower side of the valve body 1. A lower step surface is formed on the lower side of the valve body 1 below the lower shaft hole 19. A thrust pad 28 is fitted on the lower side of the valve stem 2. The upper surface of the thrust pad 28 abuts against the lower step surface, and the lower surface of the thrust pad 28 abuts against the thrust bearing 27. Under the combined action of the split ring 26, the thrust bearing 27, and the thrust pad 28, the valve stem 2 is prevented from moving upward, thus achieving the anti-blowout function of the valve stem 2.

[0038] In addition, an upper dustproof ring is fitted on the upper side of the valve stem 2 on the eccentric member 21, and a lower dustproof ring is fitted on the lower side of the valve stem 2 on the lower side of the eccentric member 21. The lower dustproof ring prevents dust and particulate media from entering the mating area between the lower sliding bearing and the valve stem 2, while the upper dustproof ring prevents dust and particulate media from entering the mating area between the upper sliding bearing and the valve stem 2. The lower and upper dustproof rings prevent damage to the lower and upper sliding bearings, and the torque of the valve stem 2 will not increase abnormally, effectively extending the service life of the valve.

[0039] The working process of this embodiment is as follows: When the butterfly plate 3 is opened, the valve stem 2 rotates relative to the eccentric sleeve 22, and the sliding block 55 slides in the sector groove 24 and moves towards the limiting hole 243. At this time, the ball 561 slides in the first guide groove 581 and moves towards the second guide groove 582. When the sliding block 55 moves above the limiting hole 243, the ball 561 is just above the inclined surface of the first inclined surface 583. When the valve stem 2 continues to rotate, because the sliding block 55 abuts against the end wall of the sector groove 24, the valve stem 2 and the eccentric sleeve 22 rotate synchronously, and the ball... Ball 561 will enter the second guide groove 582 along the first inclined surface 583. When the valve stem 2 and the eccentric sleeve 22 rotate synchronously, the ball 561 slides in the second guide groove 582. When the butterfly plate 3 is closed, the valve stem 2 and the eccentric sleeve 22 rotate synchronously, and the ball 561 slides along the second guide groove 582. When the butterfly plate 3 is closed, the ball 561 rolls to the top of the first inclined surface 583 and disengages from the limiting hole 243. The valve stem 2 continues to rotate, and the valve stem 2 and the eccentric sleeve 22 rotate relative to each other, so that the snap-fit ​​plate 312 and the snap-fit ​​groove 401 can be inserted.

[0040] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0042] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A triple-eccentric bidirectional sealing butterfly valve, characterized in that, include: The valve body has a channel for the flow of medium along the first direction; A valve stem, which extends through the valve body in a second direction and is rotatably disposed thereon, and an eccentric component located on the valve stem within the channel is provided that is eccentric to the axis of rotation of the valve stem; The butterfly plate is fixedly mounted on the eccentric component; and A valve seat is fixedly disposed within the channel and is used to abut against the butterfly plate and seal and cut off the channel when the butterfly plate rotates with the valve stem.

2. The triple-eccentric bidirectional sealing butterfly valve according to claim 1, characterized in that, The eccentric component is integrally formed with the valve stem, and the butterfly plate is fixedly connected to the eccentric component by fasteners.

3. The triple-eccentric bidirectional sealing butterfly valve according to claim 1, characterized in that, The eccentric component includes an eccentric sleeve fitted onto the valve stem within the channel. The eccentric sleeve is configured to rotate relative to the valve stem. The eccentric portion of the eccentric sleeve is provided with a connecting sleeve for connecting to the butterfly plate. The butterfly plate is provided with a snap-fit ​​portion, and the valve seat is provided with a mating portion that engages with the snap-fit ​​portion. The eccentric component also includes a transmission mechanism. The transmission mechanism is configured such that when the valve stem rotates, it drives the eccentric sleeve to rotate so that the butterfly plate and the valve seat abut against and seal the channel, and then drives the snap-fit ​​portion to engage with the mating portion.

4. The triple-eccentric bidirectional sealing butterfly valve according to claim 3, characterized in that, The channel is provided with a first mounting position and a second mounting position at intervals along a first direction. The valve seat includes a fixing ring, a pressure plate and a sealing ring. The sealing ring and the pressure plate are located at the first mounting position. The fixing ring is located at the second mounting position and is used to press the pressure plate and the sealing ring together. The sealing ring is configured such that when the butterfly plate rotates, the butterfly plate abuts against the sealing ring to seal and cut off the channel.

5. The triple-eccentric bidirectional sealing butterfly valve according to claim 4, characterized in that, The snap-fit ​​part includes a first receiving groove extending along the length direction of the butterfly plate. The first receiving groove is provided with a snap-fit ​​plate that can be raised and lowered along the first receiving groove. The snap-fit ​​plate is connected to the transmission mechanism. The mating part is a snap-fit ​​groove that mates with the snap-fit ​​plate. When the butterfly plate rotates and abuts against the sealing ring for sealing, the transmission mechanism drives the snap-fit ​​plate to extend out of the first receiving groove and snap-fit ​​with the snap-fit ​​groove.

6. The triple-eccentric bidirectional sealing butterfly valve according to claim 5, characterized in that, The first receiving groove penetrates the butterfly plate. The butterfly plate has a first connecting groove extending in a first direction. The first connecting groove is used to connect the first receiving groove and the connecting sleeve. A first support is provided in the first connecting groove. A positive and negative screw is rotatably provided on the first support. The positive and negative thread portions of the positive and negative screws extend into the first receiving groove respectively. There are two locking plates and two locking grooves. The two locking plates are threadedly connected to the positive and negative thread portions of the positive and negative screws respectively. The positive and negative screws are connected to the transmission mechanism so that when the valve stem rotates to drive the butterfly plate to rotate and abut against the sealing ring for sealing, the transmission mechanism drives the positive and negative screws to rotate so that the locking plates engage with the locking grooves.

7. The triple-eccentric bidirectional sealing butterfly valve according to claim 6, characterized in that, The transmission mechanism includes a first transmission gear, a second transmission gear, a third transmission gear, and a clutch. The first transmission gear is disposed on the positive and negative lead screws. The second transmission gear is rotatably disposed within the eccentric sleeve and is connected to the first transmission gear. The valve stem has a reduced diameter section. The third transmission gear is sleeved on the reduced diameter section and is used to connect to the second transmission gear. The clutch is disposed between the eccentric sleeve and the valve stem. The clutch has a first position and a second position. When the clutch is in the first position, the eccentric sleeve and the valve stem rotate synchronously to make the butterfly plate abut against the sealing ring for sealing. When the clutch is in the second position, the eccentric sleeve and the valve stem rotate relative to each other to make the butterfly plate abut against the sealing ring for sealing before driving the snap-fit ​​plate to snap against the snap-fit ​​groove.

8. The triple-eccentric bidirectional sealing butterfly valve according to claim 7, characterized in that, The clutch includes a sliding block, a connecting rod, and a guide plate. The lower part of the valve stem has a second receiving groove for accommodating the guide plate and the connecting rod. The rotation axis of the connecting rod is offset from the rotation axis of the valve stem. The guide plate has an arc-shaped guide slide, within which are a first guide groove, a second guide groove, and a first inclined surface connecting the first and second guide grooves. The first guide groove is higher than the second guide groove. The center of curvature of the guide slide is located on the rotation axis of the valve stem. The connecting rod is configured such that its bottom end can slide along the guide slide. The eccentric sleeve has a fan-shaped groove, within which is a second inclined surface. The inclined surface has a stop at one end and a limiting hole at the other end. The first end of the second inclined surface is higher than the second end of the second inclined surface. The sliding block is located at the top of the connecting rod and is configured to slide along the fan-shaped groove. When the clutch is in the first position, the sliding block slides along the second inclined surface from the limiting hole toward the stop and abuts against the stop. The bottom end of the connecting rod slides in the first guide groove. When the clutch is in the second position, the sliding block slides along the second inclined surface from the stop toward the limiting hole and enters the limiting hole. The bottom end of the connecting rod enters the second guide groove from the first guide groove and slides in the second guide groove.

9. The triple-eccentric bidirectional sealing butterfly valve according to claim 8, characterized in that, The bottom end of the connecting rod is provided with a ball bearing, which is configured to slide along the guide rail; and / or The clutch also includes a support rod, which is fixedly disposed at the bottom end of the guide plate.

10. The triple-eccentric bidirectional sealing butterfly valve according to claim 4, characterized in that, The sealing ring comprises multiple metal layers and multiple graphite layers, which are arranged alternately.

11. The triple-eccentric bidirectional sealing butterfly valve according to claim 10, characterized in that, The total number of metal layers and graphite layers is not less than five, the thickness of the metal layer is 1.2mm to 1.6mm, and the thickness of the graphite layer is 0.6mm to 0.8mm.

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