Dual-drive dynamic sealing metal three-eccentric hard sealing butterfly valve

Abstract

The utility model provides a dual-drive dynamic sealing metal three-eccentric hard sealing butterfly valve, which belongs to the technical field of three-eccentric hard sealing butterfly valves, and comprises a valve body, a valve seat, a valve rod, a butterfly plate and a driving device, the valve body is provided with a through hole, the valve body comprises a fixed seat, a dynamic sealing assembly and a sealing enhancing assembly, the fixed seat is arranged at the top of the valve body; the dynamic sealing assembly comprises a sliding sleeve, a corrugated pipe and a limiting gland, the sliding sleeve is arranged on the outer side of the valve rod, the limiting gland is arranged in the fixing base, the two ends of the corrugated pipe are connected with the sliding sleeve and the limiting gland respectively, and the corrugated pipe is wound around the outer side of the valve rod; the dynamic sealing assembly and the sealing enhancing assembly are combined for use, it is ensured that in the use process of the valve, the gap change between the valve rod and the valve body can be effectively compensated, reliable dynamic sealing is provided, abrasion and corrosion of the sealing ring assembly are reduced, and the service life of the sealing ring assembly is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to three eccentric hard sealing butterfly valve technical field, concretely relates to a kind of double-drive dynamic sealing metal three eccentric hard sealing butterfly valve. BACKGROUND

[0002] In the patent application No.202020441085.8, a double-drive dynamic sealing metal three eccentric hard sealing butterfly valve is proposed, which includes a valve body, a butterfly plate, a valve stem, a driving device for driving the valve stem to move, and a force amplification mechanism arranged on the valve body. The force amplification mechanism includes a tensioning rod, a moving device for driving the tensioning rod to move into and out of the inner cavity of the valve body, a wedge block, and a tensioning block. The wedge block is fixedly arranged on the butterfly plate, and the middle part of the tensioning block is hingedly connected to the butterfly plate by a pin shaft. The tensioning block is provided with a tensioning end in sliding contact with the surface of the tensioning rod and a pressing end in abutment with the surface of the butterfly plate. The tensioning end and the pressing end are located on opposite sides of the pin shaft, respectively. When the butterfly plate is in a bidirectional sealing state, the wedge blocks located on the opposite sides of the tensioning rod and the tensioning ends of the tensioning blocks are in close contact with the surface of the tensioning rod, and the pressing end of the tensioning block is in close contact with the surface of the butterfly plate.

[0003] Currently, the double-drive dynamic sealing metal three eccentric hard sealing butterfly valve is widely used in high-pressure, high-temperature, and corrosive medium environments due to its unique design and excellent performance. The sealing performance of the butterfly valve directly affects the safety and efficiency of the system. In the prior art, the valve stem may be axially or radially displaced due to temperature changes or vibrations during use, resulting in separation from the sealing element and causing leakage. Moreover, high-speed fluid directly impacts the sealing element, which can shorten the service life of the sealing element. SUMMARY

[0004] To solve the above technical problems, the utility model aims to provide a double-drive dynamic sealing metal three eccentric hard sealing butterfly valve. By using the dynamic sealing assembly and the sealing enhancement assembly in combination, the utility model can effectively compensate for the gap changes between the valve stem and the valve body during valve use, provide reliable dynamic sealing, reduce the wear and corrosion of the sealing ring assembly, and prolong the service life of the sealing ring assembly.

[0005] The specific technical solution is as follows:

[0006] A double-drive dynamic sealing metal three eccentric hard sealing butterfly valve includes a valve body, a valve seat, a valve stem, a butterfly plate, and a driving device. The valve body is provided with a through hole, which includes a fixed seat, a dynamic sealing assembly, and a sealing enhancement assembly. The fixed seat is installed on the top of the valve body. The dynamic sealing assembly includes a sliding sleeve, a bellows, and a limiting gland. The sliding sleeve is arranged on the outside of the valve stem, the limiting gland is arranged in the fixed seat, the two ends of the bellows are connected to the sliding sleeve and the limiting gland, respectively, and the bellows is arranged around the outside of the valve stem. The sealing enhancement assembly includes a sealing ring assembly and a flow guide cover. The sealing ring assembly is arranged in the through hole, and the flow guide cover is arranged in the valve body, with the flow guide cover opposite to the position of the through hole.

[0007] In addition, the double-drive dynamic sealing metal three-eccentric hard sealing butterfly valve provided by the utility model has the following additional technical features:

[0008] In the technical scheme, the sealing ring assembly comprises a first sealing ring and a second sealing ring; the first sealing ring is embedded in the through hole; and the second sealing ring is connected to the bottom of the first sealing ring and is fixed in the inner wall of the valve body by a screw.

[0009] In the technical scheme, the first sealing ring and the second sealing ring are of an integrated structure.

[0010] In the technical scheme, the double-drive dynamic sealing metal three-eccentric hard sealing butterfly valve further comprises a bolt, a first positioning nut and a second positioning nut; the bolt is fixed in the fixing seat; the first positioning nut and the second positioning nut are both in threaded connection with the bolt; the limiting gland is installed at the bolt; and the first positioning nut and the second positioning nut are respectively attached to the top surface and the bottom surface of the limiting gland.

[0011] In the technical scheme, the double-drive dynamic sealing metal three-eccentric hard sealing butterfly valve further comprises a lock nut; the lock nut is in threaded connection with the bolt; and the lock nut is attached to the top surface of the first positioning nut.

[0012] In the technical scheme, the gap between the flow guide cover and the inner wall of the valve body is filled with sealant.

[0013] Compared with the prior art, the double-drive dynamic sealing metal three-eccentric hard sealing butterfly valve has the following beneficial effects:

[0014] 1. The combination of the sliding sleeve, the bellows and the limiting gland can effectively compensate for the gap change between the valve stem and the valve body, thereby ensuring the dynamic sealing property of the valve during operation; the bellows is arranged on the outer side of the valve stem, so that the sealing is realized without hindering the operation of the valve stem.

[0015] 2. The combination of the sealing ring assembly and the flow guide cover enhances the sealing property of the valve, reduces the possibility of leakage, and the flow guide cover guides the fluid in the valve body, thereby reducing the direct impact on the sealing ring assembly, further reducing the abrasion and corrosion of the sealing ring assembly, and prolonging the service life of the sealing ring assembly. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a sectional view of the double-drive dynamic sealing metal three-eccentric hard sealing butterfly valve.

[0017] Fig. 2 It is a structural schematic view of the double-drive dynamic sealing metal three-eccentric hard sealing butterfly valve.

[0018] Fig. 3This is a schematic diagram of the through hole structure of this utility model;

[0019] in, Figs. 1-3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0020] 10 Valve body, 11 Valve seat, 12 Valve stem, 13 Butterfly plate, 14 Drive device, 15 Through hole, 16 Sliding sleeve, 17 Bellows, 18 Limiting gland, 19 Flow guide, 20 First sealing ring, 21 Second sealing ring, 22 Bolt, 23 First positioning nut, 24 Second positioning nut, 25 Anti-loosening nut, 26 Fixing seat. Detailed Implementation

[0021] The following are specific implementation cases and appendices. Figs. 1-3 The present invention will be further described below, but the present invention is not limited to these embodiments.

[0022] A dual-drive dynamic-seal metal triple-eccentric hard-seal butterfly valve, such as Figs. 1-3 As shown, the valve includes a valve body 10, a valve seat 11, a valve stem 12, a butterfly plate 13, and a drive device 14. The valve body 10 has a through hole 15 and includes: a fixed seat 26, a dynamic sealing assembly, and a sealing enhancement assembly. The fixed seat 26 is installed on the top of the valve body 10. The dynamic sealing assembly includes a sliding sleeve 16, a bellows 17, and a limiting gland 18. The sliding sleeve 16 is located on the outside of the valve stem 12, and the limiting gland 18 is located inside the fixed seat 26. The two ends of the bellows 17 are connected to the sliding sleeve 16 and the limiting gland 18, respectively, and the bellows 17 is wound around the outside of the valve stem 12. The sealing enhancement assembly includes a sealing ring assembly and a flow guide 19. The sealing ring assembly is located inside the through hole 15, and the flow guide 19 is located inside the valve body 10, with the flow guide 19 and the through hole 15 being opposite each other.

[0023] With the above structure, the sliding sleeve 16 is set on the outside of the valve stem 12, and the outer wall of the sliding sleeve 16 fits against the inner wall of the through hole 15. When the valve stem 12 deviates slightly up or down or left or right, the sliding fit between the sliding sleeve 16 and the inner wall of the through hole 15 guides the valve stem 12 to automatically center itself when it deviates, reducing the friction between the valve stem 12 and the inner wall of the through hole 15. The design of the bellows 17 allows it to expand and contract with the movement of the valve stem 12 to compensate for the change in the gap between the valve stem 12 and the valve body 10 and maintain dynamic sealing. The sealing ring assembly forms a double sealing barrier at the through hole 15, and the flow guide shroud 19 guides the high-speed fluid to avoid direct impact on the sealing ring assembly, thereby reducing wear and corrosion of the seal.

[0024] Specifically, by the combined use of the sliding sleeve 16, the bellows 17 and the limiting gland 18, the gap variation between the valve stem 12 and the valve body 10 can be effectively compensated, the dynamic sealing of the valve during operation is ensured, the bellows 17 is arranged on the outer side of the valve stem 12, the sealing is realized while the operation of the valve stem 12 is not hindered. By the combined use of the sealing ring assembly and the flow deflector 19, the sealing performance of the valve is enhanced, the possibility of leakage is reduced, the flow deflector 19 plays a guiding role on the fluid in the valve body 10, thereby reducing the direct impact on the sealing ring assembly, further reducing the wear and corrosion of the sealing ring assembly, and prolonging the service life of the sealing ring assembly.

[0025] Specifically, when the driving device 14 controls the rotation of the valve stem 12, the sliding sleeve 16 guides the movement of the valve stem 12, so that it can run smoothly, the bellows 17 expands and contracts with the action of the valve stem 12, compensates for the gap variation between the valve stem 12 and the valve body 10, and maintains dynamic sealing. And the limiting gland 18 can ensure that the bellows 17 remains stable in a high-pressure environment, so that it will not displace or deform excessively.

[0026] Specifically, the driving device 14 of the butterfly valve of the utility model is a manual and electric control mode, which controls the rotation of the valve stem 12.

[0027] Specifically, the main function of the limiting gland 18 is to provide a stable support point for the bellows 17, so that the bellows 17 can maintain its shape and function while compensating for the displacement of the valve stem 12, avoiding damage caused by excessive stretching or compression.

[0028] In the embodiment of the utility model, as shown in Fig. 1 The sealing ring assembly comprises: a first sealing ring 20 and a second sealing ring 21; the first sealing ring 20 is embedded in the through hole 15, the second sealing ring 21 is connected with the bottom of the first sealing ring 20, and the second sealing ring 21 is fixed on the inner wall of the valve body 10 by a screw.

[0029] By the combined use of the first sealing ring 20 and the second sealing ring 21, a double-sealing design is realized, thereby improving the sealing performance of the through hole 15 and reducing the risk of leakage, and the position of the second sealing ring 21 is fixed by a screw, thereby preventing the second sealing ring 21 from displacing.

[0030] In the embodiment of the utility model, the first sealing ring 20 and the second sealing ring 21 are of an integrated structure.

[0031] By setting the first sealing ring 20 and the second sealing ring 21 as an integrated structure, the reliability of the sealing is enhanced, and the fluid can be effectively blocked.

[0032] Specifically, the first sealing ring 20 is fixedly connected with the inner wall of the through hole 15, so that the first sealing ring 20 is prevented from loosening, and the position of the first sealing ring 20 can be fixed in a fixedly pasted or fastener fixed manner.

[0033] In the embodiment of the utility model, as shown in Figs. 1-2 It also comprises a bolt 22, a first positioning nut 23 and a second positioning nut 24, the bolt 22 is fixed in the fixed seat 26, the first positioning nut 23 and the second positioning nut 24 are all in threaded connection with the bolt 22, the limiting gland 18 is installed at the bolt 22, and the first positioning nut 23 and the second positioning nut 24 respectively abut the top surface and the bottom surface of the limiting gland 18.

[0034] The position of the limiting gland 18 is determined by the first positioning nut 23 and the second positioning nut 24, and this fixing mode is convenient for fine adjustment of the position of the limiting gland 18.

[0035] In the embodiment of the utility model, as shown in Figs. 1-2 It also comprises a lock nut 25, the lock nut 25 is in threaded connection with the bolt 22, and the lock nut 25 abuts the top surface of the first positioning nut 23.

[0036] The lock nut 25 is arranged, so that the first positioning nut 23 is prevented from loosening in a long-term use process.

[0037] In the embodiment of the utility model, the gap between the flow guide cover 19 and the inner wall of the valve body 10 is filled with sealant.

[0038] The gap between the flow guide cover 19 and the inner wall of the valve body 10 is filled with sealant, so that fluid leakage from the gap between the flow guide cover 19 and the inner wall of the valve body 10 is effectively prevented, and the sealing performance is improved.

[0039] The implementation process is as follows: the combination of the sliding sleeve 16, the bellows 17 and the limiting gland 18 can effectively compensate for the gap change between the valve stem 12 and the valve body 10, so that the dynamic sealing performance of the valve in the operation process is guaranteed, the bellows 17 is arranged on the outer side of the valve stem 12, the sealing is realized while the operation of the valve stem 12 is not hindered; the combination of the sealing ring assembly and the flow guide cover 19 enhances the sealing performance of the valve, reduces the possibility of leakage, and the flow guide cover 19 plays a guiding role on the fluid in the valve body 10, so that the direct impact on the sealing ring assembly is reduced, the wear and corrosion of the sealing ring assembly are reduced, and the service life of the sealing ring assembly is prolonged.

[0040] In the description of the utility model, the term "a plurality of" refers to two or more than two, unless otherwise expressly limited, the term "up", "down" and the like indicate the orientation or position relationship is based on the orientation or position relationship shown in the drawing, is only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the device or element referred to must have a particular orientation, a particular orientation and operation, therefore, cannot be understood as a limitation on the utility model;The terms "connection", "installation", "fixing" and the like should be understood broadly, for example, "connection" can be fixedly connected, can also be detachably connected, or integrally connected;It can be directly connected, or indirectly connected through an intermediate medium.

[0041] In the description of the utility model, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model.In the utility model, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] The above only for the preferred embodiment of the utility model has, and does not limit the utility model, for those skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included within the protection scope of the utility model.

Claims

1. A double drive dynamic seal metal triple offset hard seal butterfly valve comprising a valve body, a valve seat, a valve stem, a butterfly plate and a drive device, a through hole is arranged on the valve body, characterized in that, The utility model relates to a valve, including: The fixed seat is installed on the top of the valve body, the dynamic sealing assembly includes the sliding sleeve, the bellows and the limit gland, the sliding sleeve is arranged on the outside of the valve rod, the limit gland is arranged in the fixed seat, both ends of the bellows are connected with the sliding sleeve and the limit gland respectively, and the bellows is arranged on the outside of the valve rod, the sealing reinforcing assembly includes the sealing ring assembly and the flow guide cover, the sealing ring assembly is arranged in the through hole, the flow guide cover is arranged in the valve body, and the flow guide cover is opposite to the position of the through hole.

2. A double actuated dynamically sealed metal triple offset hard sealing butterfly valve according to claim 1, characterized in that, The sealing ring assembly includes: the first sealing ring and the second sealing ring, the first sealing ring is embedded in the through hole, the second sealing ring is connected with the bottom of the first sealing ring, and the second sealing ring is fixed in the inner wall of the valve body through a screw.

3. A double actuated dynamic seal metal triple offset hard seal butterfly valve according to claim 2, wherein, The first sealing ring and the second sealing ring are integrated.

4. A double actuated dynamic seal metal triple offset hard seal butterfly valve in accordance with claim 1 wherein, Further including: The bolt is fixed in the fixed seat, the first positioning nut and the second positioning nut are all connected with the bolt in screw threads, the limit gland is installed at the bolt, and the first positioning nut and the second positioning nut are respectively attached to the top surface and the bottom surface of the limit gland.

5. A double actuated dynamic seal metal triple offset hard seal butterfly valve according to claim 4, wherein, Further including: The lock nut is connected with the bolt in screw threads, and the lock nut is attached to the top surface of the first positioning nut.

6. A double actuated dynamic seal metal triple offset hard seal butterfly valve in accordance with claim 1 wherein, The gap between the flow guide cover and the inner wall of the valve body is filled with sealant.

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