Hard sealing eccentric butterfly valve

Abstract

The utility model discloses a hard sealing eccentric butterfly valve which comprises a valve body, a support, a driving device, a valve rod and a butterfly plate, an upstream channel and a downstream channel are arranged in the valve body, the support is installed at the upper end of the valve body, the driving device is arranged on the support, the valve rod penetrates through the upper end of the valve body, and the outer end of the valve rod is in linkage connection with the output end of the driving device. The inner end of the valve rod is in linkage connection with a butterfly plate arranged in the valve body, and a valve seat is further arranged on the inner wall of the valve body. A pressure reducing channel used for communicating the upstream channel with the downstream channel is arranged in the valve body, a pressure reducing mechanism used for controlling opening and closing of the pressure reducing channel is further installed in the valve body, the valve rod comprises an upper rod and a lower rod which are coaxially connected, and a driving structure used for being in linkage with the pressure reducing mechanism is arranged on the upper rod. The upper rod idles firstly, drives the depressurization mechanism through the driving structure to open the depressurization channel, and then drives the lower rod to rotate. Opening noise of the valve can be remarkably reduced, and meanwhile the service life of the valve can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a hard-sealed eccentric butterfly valve. Background Art

[0002] In order to ensure the pressure resistance and stability of the butterfly valve and avoid excessive extrusion between the valve disc and the valve seat, most existing butterfly valves adopt a double eccentric structure. The double eccentric structure means that the valve stem axis deviates from the center of both the butterfly disc and the valve body. After the valve stem drives the butterfly disc to rotate and open, the butterfly disc can quickly separate from the valve seat, greatly eliminating unnecessary excessive extrusion and scraping between the butterfly disc and the valve seat, reducing the torque when the butterfly valve is opened, reducing wear and extending the life of the valve seat.

[0003] Chinese utility model patent application number CN201420183315.X discloses a double-eccentric metal hard-seal butterfly valve. This butterfly valve, like conventional double-eccentric butterfly valves on the market, uses a valve stem to drive the disc to rotate, achieving valve opening and closing. However, during use, users of this valve structure have gradually discovered the following drawbacks: at the moment the valve opens, the high-pressure upstream medium often instantly impacts the downstream side, causing loud impact noise. Furthermore, this impact can easily damage components within the valve body, shortening the valve's service life.

[0004] Therefore, it is necessary to improve the existing butterfly valve. Utility Model Content

[0005] The purpose of the utility model is to provide a hard-sealed eccentric butterfly valve, which can significantly reduce the valve opening noise and also help to increase the service life of the valve.

[0006] To achieve the above-mentioned object, the utility model provides the following technical solutions: a hard-sealed eccentric butterfly valve, comprising a valve body, a bracket, a driving device, a valve stem and a butterfly plate, wherein an upstream channel and a downstream channel are provided in the valve body, the bracket is mounted on the upper end of the valve body, the driving device is arranged on the bracket, the valve stem passes through the upper end of the valve body, and the outer end of the valve stem is linked to the output end of the driving device, the inner end of the valve stem is linked to the butterfly plate arranged in the valve body, and a valve seat is further provided on the inner wall of the valve body for abutting against the butterfly plate to form a sealing fit when the valve is closed; a pressure-reducing channel for connecting the upstream channel and the downstream channel is provided in the valve body, and a pressure-reducing mechanism for controlling the opening and closing of the pressure-reducing channel is further installed in the valve body, the valve stem comprises an upper rod and a lower rod connected coaxially, the upper rod is provided with a driving structure for forming a linkage with the pressure-reducing mechanism, and when the upper rod rotates, it has a first state of idling alone and a second state of driving the lower rod to rotate. When the valve is opened, the upper rod first idles and drives the pressure-reducing mechanism through the driving structure to open the pressure-reducing channel, and then drives the lower rod to rotate.

[0007] By adopting the above technical solution, it is possible to achieve that at the moment the valve is opened, the pressure-reducing channel is first opened to reduce the pressure in the upstream channel, and then the valve stem drives the butterfly plate to fully open, and the pressure of the upstream channel medium is reduced in advance. This can significantly improve the fluid impact at the moment the valve is opened, thereby greatly reducing the opening noise of the valve. At the same time, it can also reduce the damage of the fluid to the components inside the valve, which helps to increase the service life of the valve.

[0008] The utility model is further configured such that a circular groove is provided at the lower end of the upper rod, a rotating column is provided at the upper end of the lower rod and matches the circular groove, an arc-shaped groove is provided on the outer circular surface of the rotating column, and a linkage protrusion is provided on the inner circular surface of the circular groove, and the linkage protrusion can be relatively slidably arranged in the arc-shaped groove along the circumferential direction.

[0009] By adopting the above technical solution, when the linkage protrusion of the upper rod slides in the arc groove of the lower rod, the upper rod rotates idly. When the linkage protrusion of the upper rod abuts against the end of the arc groove of the lower rod, the rotation of the upper rod can drive the lower rod to rotate, thereby realizing the switching of the two states when the upper rod rotates.

[0010] The utility model is further configured as follows: the pressure reducing mechanism includes a pressure reducing seat, a valve core, a spring and an end cover, the pressure reducing channel includes a middle cavity and a first channel and a second channel arranged at both ends of the middle cavity and connected to the upstream channel respectively, the pressure reducing seat is installed in the middle cavity, and one end of the pressure reducing seat is provided with a flow port connected to the first channel, the end cover is threadedly connected to the other end of the pressure reducing seat, and a hexagonal hole is opened axially on the end cover, the valve core is axially slidably arranged in the pressure reducing seat, the spring is clamped between the valve core and the end cover, the outer periphery of the valve core is provided with a conical sealing portion for resisting against the inner end of the flow port under the action of the spring to form a sealing fit, the front end of the valve core passes through the flow port and the first channel in turn to cooperate with the driving structure on the valve stem, and the driving structure realizes the opening and closing of the pressure reducing channel by driving the valve core to move axially.

[0011] By adopting the above technical solution, when the valve is fully closed, the valve core is only subjected to the force of the spring, and the conical sealing portion on the valve core is against the inner end of the flow port, blocking the pressure reduction channel. When the upper rod rotates, the driving structure acts on the valve core, causing the conical sealing portion of the valve core to separate from the inner end of the flow port, thereby realizing the conduction of the pressure reduction channel. The pressure reduction mechanism has a simple structure and responds very quickly.

[0012] The present invention is further configured such that the driving structure includes a groove provided on the side of the upper rod, and a guiding inclined surface for cooperating with the front end of the valve core is provided between the inner end of the groove and the outer circular surface of the upper rod.

[0013] By adopting the above technical solution, the radial length of the outer cylindrical surface of the upper rod is changed to cooperate with the front end of the valve core, so as to realize the change of the thrust force on the valve core. The matching structure is simple and reliable, and the processing is very convenient.

[0014] The utility model is further configured such that the outer circumferential surface of the valve core is tightly fitted with the inner circumferential surface of the pressure reducing seat, and a plurality of guide grooves extending in the axial direction are provided on the outer circumferential surface of the valve core.

[0015] By adopting the above technical solution, not only the stability of the axial movement of the valve core can be guaranteed, but also when the conical sealing portion of the valve core is separated from the inner end of the flow port, it can be ensured that the fluid can smoothly pass through the valve core.

[0016] The utility model is further configured such that the valve core and the end cover are respectively provided with a first positioning groove and a second positioning groove for embedding the two ends of the spring.

[0017] By adopting the above technical solution, the spring can be positioned to ensure its stability during installation and movement, and to avoid deformation that deviates from the direction of the central axis.

[0018] The utility model is further configured such that a mounting groove is provided at one end of the valve body located at the downstream channel, a pressure ring is threadedly connected to the mounting groove, the pressure ring presses the pressure reducing seat tightly in the middle cavity, and the second channel is provided on the pressure ring.

[0019] By adopting the above technical solution, the pressure reducing seat can be fixed in the middle cavity by installing the pressure ring, and the installation operation is very convenient.

[0020] The utility model is further configured such that a first sealing ring for sealing with the inner wall of the middle cavity is installed on the outer periphery of the pressure reducing seat, and a second sealing ring for sealing with the inner end face of the mounting groove is respectively provided at the outer periphery and inner periphery of the middle cavity.

[0021] By adopting the above technical solution, the sealing performance of the pressure seat and pressure ring installation structure can be improved to avoid leakage.

[0022] The present invention is further configured such that the second channel includes an annular groove provided on the inner end surface of the pressure ring, an axial hole provided on the inner end of the annular groove, and a radial hole provided on the inner side of the axial hole and connected to the downstream channel.

[0023] By adopting the above technical solution, no matter to which angle the pressing ring is rotated, the annular groove can ensure that the second channel can be connected with the middle cavity, which greatly facilitates the installation operation of the pressing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0026] Figure 3It is a vertical cross-sectional view of the cooperation structure of the upper rod and the lower rod of the utility model;

[0027] Figure 4 This is a transverse cross-sectional view of the cooperation structure of the upper rod and the lower rod of the utility model;

[0028] Figure 5 This is a structural diagram of the valve core of the utility model;

[0029] Figure 6 It is a structural schematic diagram of the pressing ring of the utility model.

[0030] In the figure: 1. valve body; 2. bracket; 3. driving device; 4. valve stem; 5. butterfly plate; 6. upstream channel; 7. downstream channel; 8. valve seat; 9. pressure-reducing channel; 10. pressure-reducing mechanism; 11. upper rod; 12. lower rod; 13. driving structure; 14. circular groove; 15. rotating column; 16. arc groove; 17. linkage protrusion; 18. pressure-reducing seat; 19. valve core; 20. spring; 21. end cover; 22. middle cavity; 23. first channel; 24. second channel; 25. flow port; 26. hexagonal hole; 27. conical sealing part; 28. groove; 29. ​​guiding slope; 30. guide groove; 31. first positioning groove; 32. second positioning groove; 33. mounting groove; 34. pressing ring; 35. first sealing ring; 36. second sealing ring; 37. annular groove; 38. axial hole; 39. radial hole. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example: As shown in the attached Figures 1 to 6The hard-sealed eccentric butterfly valve shown includes a valve body 1, a bracket 2, a drive device 3, a valve stem 4 and a butterfly plate 5. The valve body 1 is provided with an upstream channel 6 and a downstream channel 7. The bracket 2 is mounted on the upper end of the valve body 1. The drive device 3 is arranged on the bracket 2. The drive device 3 can be a pneumatic actuator. The valve stem 4 passes through the upper end of the valve body 1, and the outer end of the valve stem 4 is linked to the output end of the drive device 3. The inner end of the valve stem 4 is linked to the butterfly plate 5 arranged in the valve body 1. The two can be fixedly connected by a cylindrical pin. At the same time, a lower hole is provided at the bottom end of the valve body 1 for positioning and supporting the bottom end of the valve stem 4. The inner wall of the valve body 1 is also provided with a valve for resisting against the butterfly plate 5 when the valve is closed. A sealing-fitting valve seat 8 is an integrated structure with the valve body 1; a pressure-reducing channel 9 for connecting the upstream channel 6 and the downstream channel 7 is provided in the valve body 1, and a pressure-reducing mechanism 10 for controlling the opening and closing of the pressure-reducing channel 9 is also installed in the valve body 1. The valve stem 4 includes an upper rod 11 and a lower rod 12 coaxially connected, and the upper rod 11 is provided with a driving structure 13 for forming a linkage with the pressure-reducing mechanism 10. When the upper rod 11 rotates, it has a first state of idling alone and a second state of driving the lower rod 12 to rotate. When the valve is opened, the upper rod 11 first idles and drives the pressure-reducing mechanism 10 through the driving structure 13 to open the pressure-reducing channel 9, and then drives the lower rod 12 to rotate. When the valve is opened, the pressure-reducing channel 9 is first opened to reduce the pressure in the upstream channel 6. Then, the valve stem 4 drives the butterfly plate 5 to fully open, and the pressure of the medium in the upstream channel 6 is reduced in advance. This can significantly improve the fluid impact at the moment the valve is opened, thereby greatly reducing the opening noise of the valve. At the same time, it can also reduce the damage of the fluid to the components inside the valve, which helps to increase the service life of the valve.

[0033] As attached Figure 3 and attached Figure 4 As shown, a circular groove 14 is provided at the lower end of the upper rod 11, and a rotating column 15 that cooperates with the circular groove 14 is provided at the upper end of the lower rod 12. An arc groove 16 is provided on the outer circumferential surface of the rotating column 15. The arc length of the arc groove 16 can be freely set according to actual conditions. A linkage protrusion 17 is provided on the inner circumferential surface of the circular groove 14. The linkage protrusion 17 can be relatively slidably arranged in the arc groove 16 along the circumferential direction. When the linkage protrusion 17 of the upper rod 11 slides in the arc groove 16 of the lower rod 12, the upper rod 11 rotates idly. When the linkage protrusion 17 of the upper rod 11 abuts against the end of the arc groove 16 of the lower rod 12, the rotation of the upper rod 11 can drive the lower rod 12 to rotate, thereby realizing the switching of the two states when the upper rod 11 rotates.

[0034] As attached Figure 2As shown, the pressure reducing mechanism 10 includes a pressure reducing seat 18, a valve core 19, a spring 20 and an end cover 21. The pressure reducing channel 9 includes a middle cavity 22 and a first channel 23 and a second channel 24 provided at both ends of the middle cavity 22 and connected to the upstream channel 6 respectively. The pressure reducing seat 18 is installed in the middle cavity 22, and one end of the pressure reducing seat 18 is provided with a flow port 25 connected to the first channel 23. The inner diameter of the flow port 25 is smaller than the inner diameter of the inner cavity of the pressure reducing seat 18. The end cover 21 is threadedly connected to the other end of the pressure reducing seat 18, that is, the pressure reducing seat 18 is hollow and open at both ends, and the end cover 21 is along the axis. A hexagonal hole 26 is opened in the direction for medium passage, which also facilitates the insertion of a hexagonal wrench to rotate the end cover 21. The valve core 19 is axially slidably arranged in the pressure reduction seat 18, and the spring 20 is clamped between the valve core 19 and the end cover 21. The outer periphery of the valve core 19 is provided with a conical sealing portion 27 for abutting against the inner end of the flow port 25 under the action of the spring 20 to form a sealing fit. The front end of the valve core 19 passes through the flow port 25 and the first channel 23 in turn and cooperates with the drive structure 13 on the valve stem 4. The drive structure 13 realizes the on-off of the pressure reduction channel 9 by driving the valve core 19 to move axially. When the valve is fully closed, the valve core 19 is only subjected to the force of the spring 20, and the conical sealing portion 27 on the valve core 19 abuts against the inner end of the flow port 25, blocking the pressure reduction channel 9. When the upper rod 11 rotates, the driving structure 13 acts on the valve core 19, causing the conical sealing portion 27 of the valve core 19 to separate from the inner end of the flow port 25, thereby realizing the conduction of the pressure reduction channel 9. The pressure reduction mechanism 10 has a simple structure and reacts very quickly.

[0035] As attached Figure 3 and attached Figure 4 As shown, the drive structure 13 includes a groove 28 provided on the side of the upper rod 11. A guide slope 29 is provided between the inner end of the groove 28 and the outer surface of the upper rod 11 for mating with the front end of the valve core 19. By changing the radial length of the outer surface of the upper rod 11 and mating with the front end of the valve core 19, the thrust force on the valve core 19 is changed. The mating structure is simple and reliable, and it is very easy to manufacture.

[0036] As attached Figure 2 and attached Figure 5 As shown, the outer circumference of the valve core 19 fits tightly against the inner circumference of the pressure reducing seat 18, and a plurality of axially extending flow guide grooves 30 are provided on the outer circumference of the valve core 19. This design not only ensures the stability of the axial movement of the valve core 19, but also ensures that the fluid can smoothly pass through the valve core 19 when the tapered sealing portion 27 of the valve core 19 is separated from the inner end of the flow port 25.

[0037] As attached Figure 2As shown, the valve core 19 and the end cover 21 are respectively provided with a first positioning groove 31 and a second positioning groove 32 for embedding the two ends of the spring 20. This design can position the spring 20, ensure its stability during installation and movement, and avoid its deformation from the direction of the central axis.

[0038] As attached Figure 2 and attached Figure 6 As shown, the valve body 1 is further provided with a mounting groove 33 at one end of the downstream passage 7. The inner surface of the mounting groove 33 has an internal thread. A pressing ring 34 is threadedly connected to the mounting groove 33. The pressing ring 34 presses the pressure reducing seat 18 tightly into the middle cavity 22. The second passage 24 is provided on the pressing ring 34. The outer end surface of the pressing ring 34 can be provided with multiple operating grooves 28 for facilitating the rotation of the pressing ring 34. By installing the pressing ring 34, the pressure reducing seat 18 can be fixed in the middle cavity 22, making the installation operation very convenient.

[0039] As attached Figure 2 As shown, the outer periphery of the pressure reducing seat 18 is mounted with a first sealing ring 35 for forming a sealing engagement with the inner wall of the central cavity 22. The inner ends of the pressure ring 34, located on the periphery and inner periphery of the central cavity 22, are each equipped with a second sealing ring 36 for forming a sealing engagement with the inner end surface of the mounting groove 33. This design improves the sealing performance of the mounting structure of the pressure seat and the pressure ring 34, preventing leakage.

[0040] As attached Figure 2 and attached Figure 6 As shown, the second passage 24 includes an annular groove 37 provided on the inner end surface of the pressing ring 34, an axial hole 38 provided at the inner end of the annular groove 37, and a radial hole 39 provided inside the axial hole 38 and communicating with the downstream passage 7. Regardless of the angle to which the pressing ring 34 is rotated, the annular groove 37 ensures that the second passage 24 can be communicated with the central cavity 22, greatly facilitating the installation operation of the pressing ring 34.

Claims

1. A hard-sealed eccentric butterfly valve, comprising a valve body (1), a bracket (2), a drive device (3), a valve stem (4) and a butterfly plate (5), wherein the valve body (1) is provided with an upstream channel (6) and a downstream channel (7), the bracket (2) is mounted on the upper end of the valve body (1), the drive device (3) is arranged on the bracket (2), the valve stem (4) passes through the upper end of the valve body (1), and the outer end of the valve stem (4) is linked to the output end of the drive device (3), and the inner end of the valve stem (4) is linked to the butterfly plate (5) arranged in the valve body (1), and a valve seat (8) is further provided on the inner wall of the valve body (1) for contacting with the butterfly plate (5) to form a sealing fit when the valve is closed; characterized in that: The valve body (1) is provided with a pressure-reducing channel (9) for connecting the upstream channel (6) and the downstream channel (7). The valve body (1) is also provided with a pressure-reducing mechanism (10) for controlling the opening and closing of the pressure-reducing channel (9). The valve stem (4) comprises an upper rod (11) and a lower rod (12) connected coaxially. The upper rod (11) is provided with a driving structure (13) for forming a linkage with the pressure-reducing mechanism (10). When the upper rod (11) rotates, it has a first state of idling alone and a second state of driving the lower rod (12) to rotate. When the valve is opened, the upper rod (11) first idles and drives the pressure-reducing mechanism (10) through the driving structure (13) to open the pressure-reducing channel (9), and then drives the lower rod (12) to rotate.

2. The hard-sealed eccentric butterfly valve according to claim 1, characterized in that: The lower end of the upper rod (11) is provided with a circular groove (14), the upper end of the lower rod (12) is provided with a rotating column (15) matched with the circular groove (14), the outer circumferential surface of the rotating column (15) is provided with an arc groove (16), the inner circumferential surface of the circular groove (14) is provided with a linkage protrusion (17), and the linkage protrusion (17) can be relatively slidably arranged in the arc groove (16) along the circumferential direction.

3. The hard-sealed eccentric butterfly valve according to claim 2, characterized in that: The pressure reducing mechanism (10) includes a pressure reducing seat (18), a valve core (19), a spring (20) and an end cover (21). The pressure reducing channel (9) includes a middle cavity (22) and a first channel (23) and a second channel (24) provided at both ends of the middle cavity (22) and respectively connected to the upstream channel (6). The pressure reducing seat (18) is installed in the middle cavity (22), and one end of the pressure reducing seat (18) is provided with a flow port (25) connected to the first channel (23). The end cover (21) is threadedly connected to the other end of the pressure reducing seat (18), and the end cover (21) is provided with six axially extending valves. The valve core (19) is axially slidably arranged in the pressure reducing seat (18), and the spring (20) is clamped between the valve core (19) and the end cover (21). The outer periphery of the valve core (19) is provided with a conical sealing portion (27) for abutting against the inner end of the flow port (25) under the action of the spring (20) to form a sealing fit. The front end of the valve core (19) passes through the flow port (25) and the first channel (23) in sequence and cooperates with the driving structure (13) on the valve stem (4). The driving structure (13) realizes the opening and closing of the pressure reducing channel (9) by driving the valve core (19) to move axially.

4. The hard-sealed eccentric butterfly valve according to claim 3, characterized in that: The driving structure (13) includes a groove (28) arranged on the side of the upper rod (11), and a guiding inclined surface (29) for matching with the front end of the valve core (19) is provided between the inner end of the groove (28) and the outer circular surface of the upper rod (11).

5. The hard-sealed eccentric butterfly valve according to claim 3, characterized in that: The outer circumferential surface of the valve core (19) is tightly fitted with the inner circumferential surface of the pressure reducing seat (18), and a plurality of guide grooves (30) extending in the axial direction are provided on the outer circumferential surface of the valve core (19).

6. The hard-sealed eccentric butterfly valve according to claim 3, characterized in that: The valve core (19) and the end cover (21) are respectively provided with a first positioning groove (31) and a second positioning groove (32) for embedding the two ends of the spring (20).

7. The hard-sealed eccentric butterfly valve according to claim 3, characterized in that: The valve body (1) is further provided with a mounting groove (33) at one end of the downstream channel (7). A pressing ring (34) is threadedly connected to the mounting groove (33). The pressing ring (34) presses the pressure reducing seat (18) tightly in the middle cavity (22). The second channel (24) is provided on the pressing ring (34).

8. The hard-sealed eccentric butterfly valve according to claim 7, characterized in that: The outer periphery of the pressure reducing seat (18) is provided with a first sealing ring (35) for forming a sealing fit with the inner wall of the middle cavity (22), and the inner end of the pressure ring (34) is provided with a second sealing ring (36) for forming a sealing fit with the inner end surface of the mounting groove (33) at the outer periphery and inner periphery of the middle cavity (22).

9. The hard-sealed eccentric butterfly valve according to claim 7, characterized in that: The second channel (24) includes an annular groove (37) provided on the inner end surface of the pressure ring (34), an axial hole (38) provided at the inner end of the annular groove (37), and a radial hole (39) provided inside the axial hole (38) and communicating with the downstream channel (7).

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