Butterfly valve shaft seal structure

Abstract

The utility model discloses a butterfly valve shaft seal structure, include: valve body, valve stem, rolling bearing, a pair of sealing assembly and a pair of adjustable extrusion subassembly. A pair of sealing assembly respectively fixedly cover the upper and lower sides of valve body, and sealing assembly includes drive top ring and fixed bottom ring, and the drive top ring and fixed bottom ring between the layout has sealing limit ring, and the drive top ring, fixed bottom ring and sealing limit ring between fill have the filler. A pair of adjustable extrusion subassembly respectively cover the two sides of a pair of drive top ring and be opposite, and adjustable extrusion subassembly includes limit loop, and the one side of limit loop close to valve body is equipped with top ring and slides, and the one side of top ring in limit loop is fixedly connected with the connecting spring of even distribution of multiple groups. The utility model discloses a butterfly valve shaft seal structure through the setting of corresponding structure, reduced the filler in the shaft seal mechanism and appeared the situation of loosening, improved the sealing reliability and stability of butterfly valve shaft seal structure.

Description

Technical Field

[0001] This utility model belongs to the field of butterfly valve shaft seal technology, and specifically relates to a butterfly valve shaft seal structure. Background Technology

[0002] A butterfly valve is a type of valve that controls fluid flow by rotating a disc-shaped opening and closing element. It is mainly used for cutting off, shutting off, and regulating pipeline media. It generally consists of several parts, including a valve body, a butterfly plate, a valve stem, a drive structure, and a shaft seal structure. The shaft seal structure is mainly used to seal the valve stem and the valve body.

[0003] In the existing technology, the shaft sealing structure of butterfly valves mainly adopts the use of sealing rings or packing. Among them, the packing mainly includes asbestos-based packing, graphite-based packing, or carbon graphite packing. When sealing rings or packing are used to seal the valve stem, it is necessary to regularly check and replace the packing to see if it is loose. This makes the reliability of this type of butterfly valve shaft sealing structure poor.

[0004] Therefore, in order to address the above-mentioned technical problems, it is necessary to provide a butterfly valve shaft seal structure.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a butterfly valve shaft seal structure that can improve the stability and reliability of the butterfly valve shaft seal.

[0007] To achieve the above objectives, a specific embodiment of this utility model provides a butterfly valve shaft seal structure, including: a valve body, a valve stem, a rolling bearing, a pair of sealing assemblies, and a pair of adjustable extrusion assemblies.

[0008] A valve stem is rotatably mounted inside the valve body, and rolling bearings are rotatably sleeved on both the upper and lower sides of the valve stem. The rolling bearings are fixedly mounted on the upper and lower sides of the valve body.

[0009] A pair of sealing components are respectively fixedly sleeved on the upper and lower sides of the valve body. The sealing components include a driving top ring and a fixed bottom ring. Both the driving top ring and the fixed bottom ring are sleeved on the outside of the valve stem. A sealing limit ring is provided between the driving top ring and the fixed bottom ring. The space between the driving top ring, the fixed bottom ring and the sealing limit ring is filled with filler.

[0010] A pair of adjustable extrusion assemblies are respectively sleeved on opposite sides of a pair of drive top rings. The adjustable extrusion assembly includes a limiting collar, which is fixedly connected to the valve body. A top ring is slidably mounted on the side of the limiting collar close to the valve body. Multiple sets of evenly distributed connecting springs are fixedly connected to the side of the top ring located inside the limiting collar.

[0011] In one or more embodiments of this utility model, a butterfly plate is rotatably mounted inside the valve body, and the butterfly plate is fixedly fitted onto the outside of the valve stem. Rotation of the valve stem drives the butterfly plate to rotate, thereby controlling the shut-off and open states of the valve body by controlling the rotation of the butterfly plate. Both ends of the valve body are integrally formed with connecting flanges, and each connecting flange has multiple evenly distributed mounting through holes. The connecting flanges connect and fix the valve body to the pipeline.

[0012] In one or more embodiments of this utility model, limit cylinders are integrally formed on both the upper and lower sides of the valve body, and a pair of rolling bearings and sealing components are fixedly assembled inside the limit cylinders. The limit cylinders limit the assembly of the sealing components and the adjustable extrusion components, thereby facilitating the sealing protection of the valve stem. A drive control box is fixedly connected above the upper limit cylinder. The drive control box provides limit protection for the worm gear, the worm gear, and the drive shaft.

[0013] In one or more embodiments of this utility model, a worm gear is fixedly connected to one end of the valve stem located inside the drive control box, a worm is meshed on one side of the worm gear, and a drive shaft is fixedly connected inside the worm. By controlling the rotation of the drive shaft, the worm is driven to rotate, thereby allowing the valve stem to drive the butterfly plate to rotate synchronously under the meshing action of the worm gear and the worm.

[0014] In one or more embodiments of this utility model, an annular receiving groove is provided on the side of the sealing limiting ring close to the valve stem, and the annular receiving groove is filled with sealing fluid. The sealing fluid can play an auxiliary sealing role for the valve stem.

[0015] In one or more embodiments of this utility model, the outer diameter of the limiting collar is the same as the inner diameter of the limiting cylinder. This facilitates the fitting and limiting of the limiting collar through the limiting cylinder. A fixing plate is integrally formed at one end of the limiting collar outside the limiting cylinder, and a clearance hole matching the valve stem is provided on the upper side of the fixing plate. The fixing plate and the limiting collar are fixed and limited by assembling and fixing the fixing plate.

[0016] In one or more embodiments of this utility model, a sealing gasket is provided between the fixing plate and the limiting cylinder. The sealing gasket ensures the sealing and stability of the connection between the fixing plate and the limiting cylinder. Multiple sets of evenly distributed assembly bolts are fixedly connected between the fixing plate and the limiting cylinder. These multiple sets of assembly bolts connect and fix the fixing plate and the limiting cylinder.

[0017] In one or more embodiments of this utility model, a guide groove is provided inside the limiting collar, the top ring is slidably assembled in the guide groove, and multiple sets of the connecting springs are evenly distributed in the guide groove.

[0018] In one or more embodiments of this utility model, a sliding bottom ring is slidably arranged within the guide groove, and the sliding bottom ring is located on the side of the multiple sets of connecting springs away from the top ring. The sliding bottom ring supports and limits the multiple sets of connecting springs. Simultaneously, the compression degree of the multiple sets of connecting springs arranged between the sliding bottom ring and the top ring can be adjusted by adjusting the position of the sliding bottom ring.

[0019] In one or more embodiments of this utility model, a pair of adjusting bolts are threadedly connected to the fixing plate, and one end of each adjusting bolt located in the guide groove abuts against the sliding bottom ring. The adjusting bolts serve to limit and control the movement of the sliding bottom ring.

[0020] Compared with the prior art, the butterfly valve shaft seal structure disclosed in this utility model reduces the possibility of packing loosening in the shaft seal mechanism through the setting of the corresponding structure, thereby improving the sealing reliability and stability of the butterfly valve shaft seal structure. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a partial structural cross-sectional view of the butterfly valve shaft seal structure in one embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure at point A in the middle; Figure 3 This is a front sectional view of the butterfly valve shaft seal structure in one embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the structure at point B; Figure 5This is a schematic diagram of the butterfly valve shaft seal structure in one embodiment of the present invention; Figure 6 This is a perspective view of the butterfly valve shaft seal structure in one embodiment of the present invention.

[0023] Explanation of key figure labels: 1-Valve body, 101-Butterfly plate, 102-Connecting flange, 103-Limit sleeve, 104-Drive control box, 105-Worm gear, 106-Worm, 107-Drive shaft, 2-Valve stem, 3-Rolling bearing, 4-Sealing assembly, 401-Drive top ring, 402-Fixing bottom ring, 403-Sealing limit ring, 404-Packing, 5-Adjustable extrusion assembly, 501-Limit collar, 502-Top ring, 503-Connecting spring, 504-Fixing plate, 505-Sealing gasket, 506-Assembly bolt, 507-Sliding bottom ring, 508-Adjusting bolt. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0025] like Figures 1 to 6 As shown, a butterfly valve shaft seal structure in one embodiment of the present invention includes: a valve body 1, a valve stem 2, a rolling bearing 3, a pair of sealing components 4, and a pair of adjustable extrusion components 5.

[0026] like Figure 6 As shown, a butterfly plate 101 is rotatably mounted inside the valve body 1, and the butterfly plate 101 is fixedly fitted onto the outside of the valve stem 2. The rotation of the valve stem 2 can drive the butterfly plate 101 to rotate, thereby controlling the cut-off and conduction states of the valve body 1 by controlling the rotation of the butterfly plate 101.

[0027] like Figure 1 As shown, both ends of the valve body 1 are integrally formed with connecting flanges 102, and each connecting flange 102 has multiple evenly distributed assembly through holes. The connecting flanges 102 are used to connect and fix the valve body 1 to the pipeline.

[0028] like Figure 3As shown, both the upper and lower sides of the valve body 1 are integrally formed with limiting cylinders 103, and a pair of rolling bearings 3 and sealing components 4 are fixedly assembled inside the limiting cylinders 103. The limiting cylinders 103 limit the assembly of the sealing components 4 and the adjustable extrusion components 5, thereby facilitating the sealing protection of the valve stem 2. A drive control box 104 is fixedly connected above the upper limiting cylinder 103. The drive control box 104 provides limiting protection for the worm gear 106 and the drive shaft 107.

[0029] like Figures 1 to 3 As shown, a worm gear 105 is fixedly connected to one end of the valve stem 2 within the drive control box 104. A worm 106 is meshed on one side of the worm gear 105, and a drive shaft 107 is fixedly connected inside the worm 106. By controlling the rotation of the drive shaft 107, the worm 106 is driven to rotate, thereby allowing the valve stem 2 to drive the butterfly plate 101 to rotate synchronously under the meshing action of the worm gear 105 and the worm 106.

[0030] like Figures 3 to 4 As shown, a valve stem 2 is rotatably mounted inside the valve body 1, and rolling bearings 3 are rotatably mounted on both the upper and lower sides of the valve stem 2. The rolling bearings 3 are fixedly mounted on the upper and lower sides of the valve body 1.

[0031] like Figures 3 to 5 As shown, a pair of sealing components 4 are fixedly sleeved on the upper and lower sides of the valve body 1, respectively. Each sealing component 4 includes a driving top ring 401 and a fixed bottom ring 402, both of which are sleeved on the outer side of the valve stem 2. The driving top ring 401 and the fixed bottom ring 402 support and limit the sealing limiting ring 403 and the packing 404. Simultaneously, the sealing tightness of the sealing limiting ring 403 and the packing 404 is ensured by controlling the mutual compression between the driving top ring 401 and the fixed bottom ring 402.

[0032] like Figures 1 to 4 As shown, a sealing limit ring 403 is provided between the driving top ring 401 and the fixed bottom ring 402. The sealing limit ring 403, in conjunction with the packing 404, seals and limits the valve stem 2, ensuring the reliability of the sealing protection for the valve stem 2.

[0033] Specifically, the sealing limit ring 403 has an annular receiving groove on the side close to the valve stem 2, and the annular receiving groove is filled with sealing fluid. The sealing fluid can play an auxiliary sealing role for the valve stem 2.

[0034] Preferably, the sealing fluid can be sealing oil, which can not only lubricate and protect the valve stem 2, but also provide auxiliary sealing for the valve stem 2.

[0035] like Figures 3 to 5As shown, packing 404 fills the space between the drive top ring 401, the fixed bottom ring 402, and the sealing limit ring 403. The packing 404 provides a sealing protection for the valve stem 2.

[0036] Preferably, the filler 404 can be a graphite-based filler, which has the advantage of good sealing and compaction effect.

[0037] like Figures 3 to 5 As shown, a pair of adjustable extrusion assemblies 5 are respectively sleeved on opposite sides of a pair of drive top rings 401. The adjustable extrusion assembly 5 includes a limiting collar 501, which is fixedly connected to the valve body 1. The limiting collar 501 limits the assembly and guides the sliding movement of the top ring 502.

[0038] The outer diameter of the limiting collar 501 is the same as the inner diameter of the limiting cylinder 103. This facilitates the fitting and limiting of the limiting collar 501 through the limiting cylinder 103.

[0039] like Figure 5 As shown, a fixing plate 504 is integrally formed at one end of the limiting collar 501 outside the limiting cylinder 103. The upper fixing plate 504 has a clearance hole that matches the valve stem 2. The fixing plate 504 and the limiting collar 501 are fixed and limited by assembling and fixing the fixing plate 504.

[0040] like Figure 5 As shown, a sealing gasket 505 is provided between the fixing plate 504 and the limiting cylinder 103. The sealing gasket 505 ensures the sealing and stability of the connection between the fixing plate 504 and the limiting cylinder 103.

[0041] like Figure 5 As shown, multiple sets of evenly distributed assembly bolts 506 are fixedly connected between the fixing plate 504 and the limiting cylinder 103. The fixing plate 504 and the limiting cylinder 103 are connected and fixed by the multiple sets of assembly bolts 506.

[0042] like Figures 3 to 4 As shown, a top ring 502 is slidably fitted onto the side of the limiting collar 501 close to the valve body 1. Multiple sets of evenly distributed connecting springs 503 are fixedly connected to the side of the top ring 502 located inside the limiting collar 501. By supporting and limiting the top ring 502 with multiple sets of connecting springs 503, the connecting springs 503 can compress the driving top ring 401. This mutual compression between the driving top ring 401 and the fixed bottom ring 402 ensures the tightness of the packing 404.

[0043] In addition, a guide groove is provided inside the limiting collar 501, the top ring 502 is slidably assembled in the guide groove, and multiple sets of connecting springs 503 are evenly distributed in the guide groove.

[0044] like Figures 3 to 5As shown, a sliding bottom ring 507 is slidably arranged within the guide groove, and the sliding bottom ring 507 is located on the side of the multiple sets of connecting springs 503 away from the top ring 502. The sliding bottom ring 507 supports and limits the multiple sets of connecting springs 503. At the same time, the compression degree of the multiple sets of connecting springs 503 arranged between the sliding bottom ring 507 and the top ring 502 can be adjusted by adjusting the position of the sliding bottom ring 507.

[0045] like Figures 3 to 5 As shown, a pair of adjusting bolts 508 are threaded onto the fixed plate 504. One end of each adjusting bolt 508, located within the guide groove, abuts against the sliding bottom ring 507. The adjusting bolts 508 serve to limit and regulate the movement of the sliding bottom ring 507.

[0046] In practical use, the sealing limit ring 403 and packing 404 are assembled and limited by driving the top ring 401 and fixing the bottom ring 402, and the valve stem 2 is subjected to auxiliary sealing treatment by squeezing and limiting the sealing limit ring 403 and packing 404 by driving the top ring 401 and fixing the bottom ring 402.

[0047] Meanwhile, the sealing gasket 505 and the fixing plate 504 can be fixedly assembled to the port of the limiting cylinder 103 by multiple sets of assembly bolts 506. The interaction between the top ring 502 and the multiple sets of connecting springs 503 allows the top ring 502 to compress and limit the driving top ring 401. The continuous application of force to the driving top ring 401 ensures the sealing tightness of the packing 404. In addition, the position of the sliding bottom ring 507 can be adjusted by controlling the rotation of the adjusting bolt 508. The compression state of the multiple sets of connecting springs 503 can be controlled by adjusting the position of the sliding bottom ring 507, thereby adjusting the compressive force of the top ring 502 on the driving top ring 401 and ensuring the stability of the compaction of the packing 404.

[0048] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A butterfly valve shaft seal structure, characterized in that, include: A valve body, in which a valve stem is rotatably mounted, and rolling bearings are rotatably sleeved on both the upper and lower sides of the valve stem, the rolling bearings being fixedly mounted on the upper and lower sides of the valve body; A pair of sealing components are respectively fixedly sleeved on the upper and lower sides of the valve body. The sealing components include a driving top ring and a fixed bottom ring. The driving top ring and the fixed bottom ring are both sleeved on the outside of the valve stem. A sealing limit ring is provided between the driving top ring and the fixed bottom ring. The space between the driving top ring, the fixed bottom ring and the sealing limit ring is filled with filler. A pair of adjustable extrusion assemblies are respectively sleeved on opposite sides of a pair of drive top rings. Each adjustable extrusion assembly includes a limiting collar, which is fixedly connected to the valve body. A top ring is slidably mounted on the side of the limiting collar close to the valve body. Multiple sets of evenly distributed connecting springs are fixedly connected to the side of the top ring located inside the limiting collar.

2. The butterfly valve shaft seal structure according to claim 1, characterized in that, The valve body is rotatably fitted with a butterfly plate, which is fixedly fitted on the outside of the valve stem. Both ends of the valve body are integrally formed with connecting flanges, and each connecting flange has multiple evenly distributed assembly through holes.

3. The butterfly valve shaft seal structure according to claim 2, characterized in that, Both the upper and lower sides of the valve body are integrally formed with limit cylinders. A pair of rolling bearings and sealing components are fixedly assembled inside the limit cylinders. A drive control box is fixedly connected above the upper limit cylinder.

4. The butterfly valve shaft seal structure according to claim 3, characterized in that, The valve stem is fixedly connected to a worm gear at one end inside the drive control box. A worm is engaged on one side of the worm gear, and a drive shaft is fixedly connected inside the worm.

5. A butterfly valve shaft seal structure according to claim 4, characterized in that, The sealing limit ring has an annular receiving groove on the side close to the valve stem, and the annular receiving groove is filled with sealing fluid.

6. The butterfly valve shaft seal structure according to claim 5, characterized in that, The outer diameter of the limiting collar is the same as the inner diameter of the limiting cylinder. The end of the limiting collar located outside the limiting cylinder is integrally formed with a fixing plate. The fixing plate located on the upper side has a clearance hole that matches the valve stem.

7. A butterfly valve shaft seal structure according to claim 6, characterized in that, A sealing gasket is provided between the fixing plate and the limiting cylinder, and multiple sets of evenly distributed assembly bolts are fixedly connected between the fixing plate and the limiting cylinder.

8. A butterfly valve shaft seal structure according to claim 7, characterized in that, The limiting collar has a guide groove, the top ring is slidably assembled in the guide groove, and multiple sets of the connecting springs are evenly distributed in the guide groove.

9. A butterfly valve shaft seal structure according to claim 8, characterized in that, A sliding bottom ring is slidably arranged in the guide groove, and the sliding bottom ring is located on the side of the multiple sets of connecting springs away from the top ring.

10. A butterfly valve shaft seal structure according to claim 9, characterized in that, A pair of adjusting bolts are threaded onto the fixed plate, and one end of each adjusting bolt located in the guide groove abuts against the sliding bottom ring.

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