Detachable and lubricable packing gland of large-diameter electric butterfly valve

Abstract

The invention relates to the technical field of valve sealing structures, and discloses a large-diameter electric butterfly valve detachable and lubricable packing gland which comprises a packing gland body, the packing gland body comprises a gland body and a pressing ring, the pressing ring is arranged at the bottom of the gland body, and a mounting groove is formed in the bottom of the gland body; the top of the pressing ring extends into the mounting groove, and a first sealing ring is arranged in a gap between the mounting groove and the outer wall of the top of the pressing ring. A first through hole allowing a valve rod to penetrate through is formed in the gland body and communicates with the mounting groove, a second through hole allowing the valve rod to penetrate through is formed in the pressing ring, a lubricating groove is formed in the hole wall of the second through hole and formed in the middle of the hole wall of the second through hole, and an oil injection hole is formed in the outer wall of one side of the pressing ring. A chip removal hole is formed in the outer wall of the other side of the oil injection hole, and the oil injection hole and the chip removal hole communicate with the lubricating groove; the device has the advantages that maintenance and disassembly are simple and rapid, the locking phenomenon is not prone to occurring, and smooth production is guaranteed.

Description

Technical Field

[0001] The invention relates to a detachable and lubricable packing gland of a large-caliber electric butterfly valve, belonging to the technical field of valve sealing structures. Background Art

[0002] Large-diameter butterfly valves for large-scale circulating water are generally large-diameter butterfly valves with thicker stems. At present, the common large-diameter butterfly valve packing glands are mostly designed with integrated welding, made of cast iron or cast steel, and their own lubrication ability is almost zero.

[0003] For example, the utility model patent with the Chinese patent authorization announcement number CN202431987U discloses a large-diameter butterfly valve that can be disassembled and replaced, in which the sealing gland disclosed is an integrated welded structure. When such large-diameter butterfly valve is in use, due to the large contact area and small gap between the gland and the valve stem, rust often gets stuck in the gap between the gland and the valve stem. Even if this large-diameter butterfly valve is provided with a diamond oil groove at the sleeve position for lubricating the valve stem to reduce the tightening force on the valve stem when the gland position rotates, the gland position is not lubricated, so the rust stuck in the gap between the gland and the valve stem will cause the gland and the valve stem to lock. After the gland and the valve stem are locked, the gland radial clearance is often too small and the tightening force is too large when the butterfly valve is switched, which is very easy to damage the thrust bearing in the external reduction mechanism such as the worm gear, thereby causing the abnormal wear of the external reduction mechanism such as the worm gear to increase in the early stage, causing great trouble and serious impact on production. At the same time, since the sealing gland is an integrated welded structure, when the gland and the valve stem become stuck and need to be disassembled and repaired on site, the sealing gland must be disassembled after the external actuator of the butterfly valve is disassembled, resulting in a large workload for maintenance and disassembly. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a detachable and lubricable packing gland for a large-caliber electric butterfly valve.

[0005] The technical solution of the present invention is as follows: A detachable and lubricable packing gland for a large-caliber electric butterfly valve comprises a packing gland body, wherein the packing gland body comprises a gland body and a pressure ring, wherein the pressure ring is arranged at the bottom of the gland body, and a mounting groove is provided on the bottom of the gland body, wherein the diameter of the mounting groove is larger than the outer diameter of the pressure ring, and the top of the pressure ring is extended into the mounting groove, and a first sealing ring is provided in the gap between the mounting groove and the outer wall of the top of the pressure ring; a first through hole is provided on the gland body for a valve stem to pass through, and the first through hole is connected with the mounting groove, a second through hole is provided on the pressure ring for the valve stem to pass through, a lubrication groove is provided on the hole wall of the second through hole, and the lubrication groove is provided in the middle position of the hole wall of the second through hole, an oil filling hole is provided on the outer wall on one side of the pressure ring, and a chip removal hole is provided on the outer wall on the other side, and both the oil filling hole and the chip removal hole are connected with the lubrication groove.

[0006] Furthermore, a mounting bracket is provided below the pressure cover body, and the mounting bracket is provided in a T-shaped structure. A mounting hole is provided on the mounting bracket, and the pressure cover body is placed on the top surface of the mounting bracket. The pressure ring is provided to extend into the mounting hole. An inlet hole is provided on the outer wall on one side of the mounting bracket, and the inlet hole is connected to the oil filling hole. An outlet hole is provided on the outer wall on the other side of the mounting bracket, and the outlet hole is connected to the chip removal hole. An adjustment component is also provided on the bottom wall of the top cross-section structure of the mounting bracket, close to the inlet hole.

[0007] Furthermore, the adjusting component includes an adjusting box, a fixing groove is provided on the bottom wall of the top cross-section structure of the mounting bracket, the adjusting box is fixedly installed in the fixing groove, the bottom of the adjusting box extends outward from the fixing groove, and an oil filling nozzle and a one-way valve are provided on the box body of the adjusting box extending out of the fixing groove, the oil filling nozzle is provided on the side wall of the adjusting box away from the inlet hole, the one-way valve is provided on the side wall of the adjusting box close to the inlet hole, and the one-way valve is provided in a manner extending into the inlet hole, an adjusting chamber is provided inside the adjusting box, symmetrically arranged connecting holes are provided inside the adjusting chamber, and the connecting holes on both sides are respectively connected with the oil inlet nozzle and the one-way valve, a piston is also movably provided inside the adjusting chamber, and the piston can control the conduction state of the connecting holes on both sides by moving along the adjusting chamber, the piston is connected to the top wall of the adjusting chamber by a first spring, and a piston rod is also provided on the piston.

[0008] Furthermore, a first mounting threaded hole and a plurality of first mounting bolt holes are provided on the top cross section structure of the mounting bracket, wherein the first mounting threaded hole is connected to the fixing groove, and the end of the piston rod away from the piston side moves out from the top of the adjusting box to the first mounting threaded hole, and a second mounting threaded hole and a plurality of second mounting bolt holes are provided on the pressure cover body, the second mounting threaded hole is corresponding to the first mounting threaded hole, and the second mounting bolt hole is corresponding to the first mounting bolt hole one by one.

[0009] Furthermore, a second sealing ring is arranged in the inlet hole, and the one-way valve passes through the second sealing ring after entering the inlet hole.

[0010] Furthermore, the valve stem passes through the gland body and the compression ring in sequence and enters the mounting hole, a packing is filled between the hole wall of the mounting hole and the outer wall of the valve stem, and the bottom wall of the compression ring is tightly arranged with the packing.

[0011] Furthermore, an adjustment groove is provided on the bottom of the pressure cover body, the adjustment groove is connected to the installation groove, a second spring is provided in the adjustment groove, the end of the second spring close to the pressure ring side is pressed against the pressure ring, and the second spring is in a compressed state when the bottom wall of the pressure ring is pressed against the packing.

[0012] Furthermore, an adjustment pressure plate is movably arranged in the adjustment groove, and the bottom surface of the adjustment pressure plate is connected to the end of the second spring away from the pressure ring side. A plurality of adjustment threaded holes are provided on the top of the pressure cover body, and each adjustment threaded hole is connected to the adjustment groove. An adjustment screw is threadedly connected in each adjustment threaded hole, and the bottom of each adjustment screw is connected to the adjustment pressure plate.

[0013] Furthermore, the diameter of the oil injection hole is larger than that of the inlet hole, and the diameter of the oil injection hole is set to ensure that the oil injection hole can remain connected with the inlet hole at any time when the pressure ring moves in the mounting hole under the action of the second spring and the adjusting pressure plate, and the diameter of the chip removal hole is larger than that of the outlet hole, and the diameter of the chip removal hole is set to ensure that the pressure ring moves in the mounting hole under the action of the second spring and the adjusting pressure plate, and the chip removal hole can remain connected with the outlet hole at any time.

[0014] Furthermore, a pressure sensor is embedded on the bottom wall of the pressure ring, and a detection end of the pressure sensor is tightly arranged against the packing.

[0015] The present invention has the following beneficial effects: The present invention provides a mounting groove at the bottom of the gland body, and cooperates with the first sealing ring to connect the gland body to the gland body, so that the packing gland body is set as a split structure. When maintenance work is needed, the gland body only needs to be removed from the mounting bracket to check the specific situation of the valve stem. In most cases, it is not necessary to connect the gland ring and take it out together. Therefore, it is not necessary to disassemble the actuator outside the butterfly valve, which greatly reduces the maintenance and disassembly workload. At the same time, a lubrication groove is provided on the gland ring, and an oil filling hole and a chip removal hole are provided. By injecting lubricating oil into the oil filling hole, the lubricating oil enters the lubrication groove, and the lubricating groove provides a accommodating position for the lubricating oil, and can also reduce the contact area between the gland ring and the valve stem. In this way, not only can the valve stem rotate more smoothly, but also the rust entering between the valve stem and the gland ring can be taken out from the chip removal hole, so that the valve stem can be prevented from locking as much as possible, and then the abnormal wear of the external deceleration mechanism that occurs later can be reduced. Compared with the prior art, the present invention has the advantages of simple and fast maintenance and disassembly, less prone to locking, and ensuring smooth production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a top view of the gland body in the present invention; Figure 3 This is the enlarged view of point A; Figure 4 This is an enlarged view of point B.

[0017] The reference numerals in the figure are as follows: 1. Packing gland body; 2. Gland body; 3. Pressing ring; 4. Mounting groove; 5. First sealing ring; 6. Valve stem; 7. First through hole; 8. Second through hole; 9. Lubrication groove; 10. Oil filling hole; 11. Chip removal hole; 12. Mounting bracket; 13. Mounting hole; 14. Inlet hole; 15. Outlet hole; 16. Adjusting box; 17. Fixing groove; 18. Oiling nozzle; 19. One-way valve; 20. Adjusting chamber; 21. Connecting hole; 22. Piston; 23. First spring; 24. Piston rod; 25. First mounting threaded hole; 26. First mounting bolt hole; 27. Second mounting threaded hole; 28. Second mounting bolt hole; 29. ​​Second sealing ring; 30. Packing; 31. Adjusting groove; 32. Second spring; 33. Adjusting pressure plate; 34. Adjusting threaded hole; 35. Adjusting screw; 36. Pressure sensor. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1: Please refer to Figure 1 , Figure 3 and Figure 4The present embodiment provides a detachable and lubricable packing gland for a large-caliber electric butterfly valve, comprising a packing gland body 1, the packing gland body 1 comprising a gland body 2 and a pressure ring 3, the pressure ring 3 being arranged at the bottom of the gland body 2, the bottom of the gland body 2 being provided with a mounting groove 4 arranged in an annular structure, the mounting groove 4 being arranged coaxially with the gland body 2, the diameter of the mounting groove 4 being arranged larger than the outer diameter of the pressure ring 3, and the specific diameter value of the mounting groove 4 can be determined according to actual conditions. The top of the pressure ring 3 is arranged to extend into the mounting groove 4, the first sealing ring 5 is arranged in the gap between the mounting groove 4 and the outer wall of the top of the pressure ring 3, the pressure ring 3 and the first sealing ring 5 are both arranged coaxially with the mounting groove 4, the outer wall of the first sealing ring 5 can be tightly set with the groove side wall of the mounting groove 4, the inner wall of the first sealing ring 5 can be tightly set with the outer wall of the top of the pressure ring 3, and the pressure ring 3 can be connected with the gland body 2 through the friction force generated by the first sealing ring 5.

[0020] Through the above-mentioned arrangement, by setting the packing gland body 1 as a split structure, that is, the gland body 2 and the pressure ring 3 can be disassembled, when maintenance work is required, it is only necessary to remove the gland body 2 to carry out the corresponding maintenance work. In most cases, there is no need to take out the connecting pressure ring 3 together. Therefore, there is no need to disassemble the actuator outside the butterfly valve, which greatly reduces the maintenance and disassembly workload.

[0021] The gland body 2 is provided with a first through hole 7 for the valve stem 6 to pass through, the first through hole 7 is connected to the mounting groove 4, and the first through hole 7 is also coaxially arranged with the mounting groove 4. The pressure ring 3 is provided with a second through hole 8 for the valve stem 6 to pass through, the aperture of the second through hole 8 is the same as that of the first through hole 7, and the second through hole 8 is coaxially arranged with the first through hole 7. A lubrication groove 9 is provided on the hole wall of the second through hole 8, and the lubrication groove 9 is also arranged in an annular structure. The lubrication groove 9 is provided in the middle position of the hole wall of the second through hole 8. The diameter of the lubrication groove 9 can be determined according to actual conditions, but it should not be too large to avoid the occurrence of the phenomenon such as slipping of the valve stem 6 due to excessive lubricating oil entering the lubrication groove 9 later. In this embodiment, the diameter of the lubrication groove 9 is 0.8 to 1 mm larger than the aperture of the second through hole 8, which is a suitable diameter. An oil filling hole 10 is provided on one side of the outer wall of the pressure ring 3, and a chip removal hole 11 is provided on the other side of the outer wall. The oil filling hole 10 and the chip removal hole 11 are both connected to the lubrication groove 9. The oil filling hole 10 and the chip removal hole 11 are arranged at the same level, and both are arranged at the upper position of the middle part of the pressure ring 3, so as to prolong the residence time of the lubricating oil subsequently entering the lubrication groove 9, thereby improving the lubrication effect.

[0022] Through the above-mentioned arrangement, the lubrication groove 9 can not only provide a storage position for the lubricating oil, but also reduce the contact area between the pressure ring 3 and the valve stem 6. During operation, the outside world injects lubricating oil into the oil filling hole 10, and the lubricating oil enters the lubrication groove 9 so as to be distributed on the valve stem 6, thereby reducing the resistance generated when the valve stem 6 rotates, making the valve stem 6 rotate more smoothly. At the same time, the lubricating oil entering the lubrication groove 9 can also bring out the rust between the valve stem 6 and the pressure ring 3 from the chip removal hole 11, thereby avoiding the locking of the valve stem 6 as much as possible, and further reducing the abnormal wear of the subsequent external deceleration mechanism.

[0023] In this embodiment, a mounting bracket 12 is further provided below the gland body 2, and the mounting bracket 12 is used for the subsequent installation of the butterfly valve body. The mounting bracket 12 is provided in a T-shaped structure, and a mounting hole 13 is provided on the mounting bracket 12. The gland body 2 is placed on the top surface of the mounting bracket 12, and the pressure ring 3 is provided to extend into the mounting hole 13. The pressure ring 3 and the mounting hole 13 are coaxially arranged. The valve stem 6 passes through the gland body 2 and the pressure ring 3 in sequence and then enters the mounting hole 13. The hole wall of the mounting hole 13 and the outer wall of the valve stem 6 are filled with a packing 30, and the bottom wall of the pressure ring 3 and the packing 30 are pressed tightly. An inlet hole 14 is provided on the outer wall on one side of the mounting bracket 12, and the inlet hole 14 is connected to the oil filling hole 10. An outlet hole 15 is provided on the outer wall on the other side of the mounting bracket 12, and the outlet hole 15 is connected to the chip removal hole 11. The outside world injects lubricating oil into the inlet hole 14 so that the lubricating oil can enter the lubrication groove 9 through the oil filling hole 10, and the waste oil and rust discharged from the chip discharge hole 11 can be discharged outward from the outlet hole 15 for corresponding collection.

[0024] In order to be able to regulate the amount of lubricating oil entering, so as to ensure the reliability of the valve stem 6 during operation. In this embodiment, an adjustment component is also provided at the bottom wall of the top cross-section structure of the mounting bracket 12 close to the inlet hole 14. The adjustment component includes an adjustment box 16, a fixing groove 17 is provided on the bottom wall of the top cross-section structure of the mounting bracket 12, the adjustment box 16 is fixedly installed in the fixing groove 17, the bottom of the adjustment box 16 extends outward from the fixing groove 17, and an oiling nozzle 18 and a one-way valve 19 are provided on the box body of the adjustment box 16 extending out of the fixing groove 17. The oiling nozzle 18 is provided on the side wall of the adjustment box 16 away from the inlet hole 14, and the oiling nozzle 18 is used to connect with the component for conveying lubricating oil from the outside, and the one-way valve 19 is provided on the side wall of the adjustment box 16 close to the inlet hole 14, and the one-way valve 19 is provided to extend into the inlet hole 14, and the conduction direction of the one-way valve 19 is from the adjustment box 16 to the inlet hole 14. An adjusting chamber 20 is provided inside the adjusting box 16. The adjusting chamber 20 is provided with symmetrically arranged communicating holes 21. The communicating holes 21 on both sides are respectively connected with the oil inlet nozzle and the one-way valve 19, so that the lubricating oil entering from the oil injection nozzle 18 can enter the one-way valve 19 after passing through the adjusting chamber 20 under the conveying action of the communicating holes 21 on both sides. A piston 22 is also movably provided inside the adjusting chamber 20. The piston 22 can control the conduction state of the communicating holes 21 on both sides by moving along the adjusting chamber 20. The piston 22 is connected to the top wall of the adjusting chamber 20 by setting a first spring 23, that is, the two ends of the first spring 23 are respectively fixedly connected to the top surface of the piston 22 and the top wall of the adjusting chamber 20. A piston rod 24 arranged vertically upward is also fixedly provided on the top surface of the piston 22. A first mounting threaded hole 25 and a plurality of first mounting bolt holes 26 are provided on the top cross-section structure of the mounting bracket 12. In the present embodiment, the number of the first mounting bolt holes 26 is 3, and the first mounting bolt holes 26 and the first mounting threaded holes 25 are distributed in a circular array with the center line of the mounting bracket 12 in the array center. Among them, the first mounting threaded hole 25 is connected with the fixing groove 17, and the end of the piston rod 24 away from the piston 22 side is movably passed through the top of the adjustment box 16 to the first mounting threaded hole 25, and a second mounting threaded hole 27 and a plurality of second mounting bolt holes 28 are provided on the gland body 2, and the second mounting threaded hole 27 is correspondingly provided with the first mounting threaded hole 25, and the second mounting bolt hole 28 is correspondingly provided with the first mounting bolt hole 26.

[0025] Through the above arrangement, corresponding mounting screws are connected to the first mounting threaded hole 25 and the second mounting threaded hole 27 through internal threads. After the mounting screws enter the first mounting threaded hole 25 from the second mounting threaded hole 27, the bottom of the mounting screws will abut against the top of the piston rod 24. As the mounting screws are continuously screwed in, the piston rod 24 will be pushed to drive the piston 22 to move downward. During the downward movement of the piston 22, the communicating holes 21 on both sides of the regulating chamber 20 will be gradually blocked, thereby reducing the flow of the communicating holes 21, and further reducing the flow of the lubricating oil flowing out of the one-way valve 19. During the process, the first spring 23 will generate tension. When the flow rate of the connecting hole 21 needs to be increased, the mounting screw is reversed so that the mounting screw moves away from the first mounting threaded hole 25. At this time, the piston rod 24 will move upward under the reset action of the first spring 23, thereby driving the piston 22 to move upward. During the upward movement of the piston 22, the connecting holes 21 on both sides of the regulating chamber 20 will be gradually exposed, thereby increasing the flow rate of the connecting hole 21, and then increasing the flow rate of the lubricating oil flowing out of the one-way valve 19, which can realize the regulation of the lubricating oil inlet amount. The lubricating oil inlet amount can be determined according to the actual situation, such as by observing the oil output of the outlet hole 15 and the discharge amount of rust, etc., to regulate the lubricating oil inlet amount. At the same time, the setting of the first mounting threaded hole 25, the second mounting threaded hole 27, the first mounting bolt hole 26 and the second mounting bolt hole 28 can also make it possible for the gland body 2 to be fixedly connected to the mounting bracket 12 by passing the corresponding mounting bolts through the first mounting bolt hole 26 and the second mounting bolt hole 28 and locking the nuts, and by screwing the corresponding mounting screws into the first mounting threaded hole 25 and the second mounting threaded hole 27, when it needs to be installed on the mounting bracket 12, thereby achieving partial overlap of the oil quantity control structure and the connecting structure, so as to reduce the required components and improve the practicability of the packing gland.

[0026] To ensure the sealing performance of the connection between the one-way valve 19 and the inlet hole 14, a second sealing ring 29 is provided in the inlet hole 14. After the one-way valve 19 enters the inlet hole 14, it passes through the second sealing ring 29. The outer wall of the second sealing ring 29 can be tightly arranged with the hole wall of the inlet hole 14, and the inner wall of the second sealing ring 29 can be tightly arranged with the outer wall of the one-way valve 19. The arrangement of the second sealing ring 29 can prevent the lubricating oil from flowing out of the inlet hole 14, thereby causing possible pollution and the like.

[0027] The packing gland provided in the first embodiment still has the following problems in actual use: since the packing 30 will be continuously worn out during the operation of the valve stem 6, the pressing force of the pressure ring 3 on the packing 30 will be continuously reduced, thereby causing the packing 30 to become loose, resulting in sealing problems between the valve stem 6 and the valve body. Therefore, based on the first embodiment, the second embodiment is proposed.

[0028] Example 2: Please refer to Figures 1 to 4 This embodiment provides a detachable and lubricable packing gland for a large-caliber electric butterfly valve, including all the structures in the first embodiment. Furthermore, an adjustment groove 31 in an annular structure is provided on the bottom of the gland body 2. The adjustment groove 31 is connected to the mounting groove 4 and is coaxially arranged with the mounting groove 4. A second spring 32 is arranged in the adjustment groove 31. The end of the second spring 32 close to the side of the pressure ring 3 is tightly arranged with the pressure ring 3. When the bottom wall of the pressure ring 3 is pressed against the packing, the second spring 32 is in a compressed state.

[0029] Through the above-mentioned arrangement, when the packing 30 is worn, the volume of the packing 30 is reduced, and the pressure exerted by the packing 30 on the pressure ring 3 will become smaller. At this time, the second spring 32 can release its own elastic potential energy to move the pressure ring 3 in the direction close to the packing 30, so that the pressure ring 3 can maintain the pressure on the packing 30, so as to ensure that the packing 30 can remain tight even when the volume becomes smaller, thereby ensuring its sealing performance and ensuring that there is no problem with the sealing between the valve stem 6 and the valve body.

[0030] In order to adjust the pressing force of the packing 30 to meet the needs of various working conditions, in this embodiment, an adjustment plate 33 is movably provided in the adjustment groove 31, and the bottom surface of the adjustment plate 33 is connected to the end of the second spring 32 away from the pressure ring 3. A plurality of adjustment threaded holes 34 are provided on the top of the gland body 2. In this embodiment, the number of the adjustment threaded holes 34 is four, and the adjustment threaded holes 34 are distributed in a circular array on the top of the gland body 2 with the center line of the gland body 2 as the array center. Each adjustment threaded hole 34 is connected to the adjustment groove 31, and an adjustment screw 35 is threadedly connected in each adjustment threaded hole 34, and the bottom of each adjustment screw 35 is rotatably connected to the adjustment plate 33.

[0031] Through the above-mentioned arrangement, by rotating the adjusting screw 35, the adjusting screw 35 can make corresponding movements into the adjusting threaded hole 34 or out of the adjusting threaded hole 34 through the threaded connection with the adjusting threaded hole 34. When the adjusting screw 35 moves into the adjusting threaded hole 34, it can push the adjusting pressure plate 33 to move downward in the adjusting groove 31, thereby squeezing the second spring 32 to make the pressure ring 3 move downward or have a tendency to move downward, so that the pressing force of the pressure ring 3 on the packing filler 30 can be increased. When the adjusting screw 35 moves out of the adjusting threaded hole 34, at this time, the adjusting screw 35 can drive the adjusting pressure plate 33 to move upward, thereby reducing the pressure on the second spring 32, so as to reduce the pressing force of the pressure ring 3 on the packing filler 30, so as to achieve the adjustment of the pressing force of the packing filler 30.

[0032] In order to facilitate the operator to know the pressing force value of the pressure ring 3 on the packing 30, a pressure sensor 36 is also embedded on the bottom wall of the pressure ring 3, and the detection end of the pressure sensor 36 is set tightly against the packing 30. When the pressure ring 3 and the packing 30 are pressed, the pressure sensor 36 will detect the corresponding pressure value. When the pressing force of the pressure ring 3 and the packing 30 changes, the pressure sensor 36 can also detect the corresponding pressure value change. The operator can know the specific pressing force value of the pressure ring 3 on the packing 30 by reading the value detected by the pressure sensor 36, so that the operator can make corresponding adjustments according to actual needs.

[0033] Since the pressing ring 3 can move in the mounting hole 13, in order to ensure that the chip removal work of oil injection can be carried out smoothly, in this embodiment, the diameter of the oil injection hole 10 is set larger than the inlet hole 14, and the diameter of the oil injection hole 10 is set to meet the pressure ring 3 under the action of the second spring 32 and the adjustment plate 33. The oil injection hole 10 can always maintain communication with the inlet hole 14, and the diameter of the chip removal hole 11 is set larger than the outlet hole 15, and the diameter of the chip removal hole 11 is set to meet the pressure ring 3 under the action of the second spring 32 and the adjustment plate 33. The diameter of the chip removal hole 11 is set to meet the pressure ring 3 under the action of the second spring 32 and the adjustment plate 33. The diameter of the chip removal hole 11 can always maintain communication with the outlet hole 15. Through the above-mentioned settings, even if the position of the pressing ring 3 is displaced to a certain extent, the oil injection hole 10 can still be connected with the inlet hole 14, which is convenient for the entry of lubricating oil, and the chip removal hole 11 can still be connected with the outlet hole 15, which is convenient for the discharge of waste oil and rust.

[0034] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A detachable and lubricable packing gland for a large-caliber electric butterfly valve, comprising a packing gland body (1), characterized in that: The packing gland body (1) comprises a gland body (2) and a compression ring (3), wherein the compression ring (3) is arranged at the bottom of the gland body (2), a mounting groove (4) is provided on the bottom of the gland body (2), the diameter of the mounting groove (4) is larger than the outer diameter of the compression ring (3), the top of the compression ring (3) is arranged to extend into the mounting groove (4), and a first sealing ring (5) is provided in the gap between the mounting groove (4) and the outer wall of the top of the compression ring (3); a first passage for the valve stem (6) to pass through is provided on the gland body (2), and a first sealing ring (5) is provided in the gap between the mounting groove (4) and the outer wall of the top of the compression ring (3); a first passage is provided on the gland body (2) and a valve stem (6) is provided to pass through the first passage A hole (7), the first through hole (7) is connected to the mounting groove (4), the pressure ring (3) is provided with a second through hole (8) for the valve stem (6) to pass through, the hole wall of the second through hole (8) is provided with a lubrication groove (9), the lubrication groove (9) is provided in the middle of the hole wall of the second through hole (8), an oil filling hole (10) is provided on one side outer wall of the pressure ring (3), and a chip removal hole (11) is provided on the other side outer wall, and the oil filling hole (10) and the chip removal hole (11) are both connected to the lubrication groove (9).

2. The detachable and lubricable packing gland of a large-caliber electric butterfly valve according to claim 1 is characterized in that: A mounting bracket (12) is also provided below the gland body (2). The mounting bracket (12) is provided in a T-shaped structure. A mounting hole (13) is provided on the mounting bracket (12). The gland body (2) is placed on the top surface of the mounting bracket (12). The pressure ring (3) is provided so as to extend into the mounting hole (13). An inlet hole (14) is provided on one side of the outer wall of the mounting bracket (12). The inlet hole (14) is connected to the oil filling hole (10). An outlet hole (15) is provided on the other side of the outer wall of the mounting bracket (12). The outlet hole (15) is connected to the chip removal hole (11). An adjustment component is also provided on the bottom wall of the top cross section structure of the mounting bracket (12) close to the inlet hole (14).

3. The detachable and lubricable packing gland of a large-caliber electric butterfly valve according to claim 2 is characterized in that: The regulating assembly comprises a regulating box (16), a fixing groove (17) is provided on the bottom wall of the top cross section structure of the mounting bracket (12), the regulating box (16) is fixedly mounted in the fixing groove (17), the bottom of the regulating box (16) protrudes outward from the fixing groove (17), an oiling nozzle (18) and a one-way valve (19) are provided on the box body of the regulating box (16) that protrudes out of the fixing groove (17), the oiling nozzle (18) is provided on the side wall of the regulating box (16) away from the inlet hole (14), the one-way valve (19) is provided on the side wall of the regulating box (16) close to the inlet hole (14), and the one-way valve (19) is in a The regulating box (16) is provided with a regulating chamber (20) extending into the inlet hole (14). The regulating chamber (20) is provided with symmetrically arranged communicating holes (21). The communicating holes (21) on both sides are respectively connected to the oil inlet nozzle and the one-way valve (19). A piston (22) is also movably arranged in the regulating chamber (20). The piston (22) can control the conduction state of the communicating holes (21) on both sides by moving along the regulating chamber (20). The piston (22) is connected to the top wall of the regulating chamber (20) by a first spring (23). A piston rod (24) is also provided on the piston (22).

4. The detachable and lubricable packing gland of a large-caliber electric butterfly valve according to claim 3 is characterized in that: A first mounting threaded hole (25) and a plurality of first mounting bolt holes (26) are provided on the top cross section structure of the mounting bracket (12), wherein the first mounting threaded hole (25) is connected to the fixing groove (17), and the end of the piston rod (24) away from the piston (22) side is movably extended from the top of the adjustment box (16) to the first mounting threaded hole (25), and a second mounting threaded hole (27) and a plurality of second mounting bolt holes (28) are provided on the gland body (2), wherein the second mounting threaded hole (27) is arranged corresponding to the first mounting threaded hole (25), and the second mounting bolt hole (28) is arranged one-to-one corresponding to the first mounting bolt hole (26).

5. The detachable and lubricable packing gland of a large-caliber electric butterfly valve according to claim 3 is characterized in that: A second sealing ring (29) is arranged in the inlet hole (14), and the one-way valve (19) passes through the second sealing ring (29) after entering the inlet hole (14).

6. The detachable and lubricable packing gland of a large-caliber electric butterfly valve according to claim 1 is characterized in that: The valve stem (6) passes through the gland body (2) and the pressure ring (3) in sequence and then enters the mounting hole (13); a packing (30) is filled between the hole wall of the mounting hole (13) and the outer wall of the valve stem (6); and the bottom wall of the pressure ring (3) and the packing (30) are tightly arranged.

7. The detachable and lubricable packing gland of a large-caliber electric butterfly valve according to claim 6 is characterized in that: The bottom of the gland body (2) is also provided with an adjustment groove (31), the adjustment groove (31) being connected to the mounting groove (4), a second spring (32) being arranged in the adjustment groove (31), the end of the second spring (32) being close to the side of the pressure ring (3) being pressed against the pressure ring (3), and the second spring (32) being in a compressed state when the bottom wall of the pressure ring (3) is pressed against the packing.

8. The detachable and lubricable packing gland of a large-caliber electric butterfly valve according to claim 7 is characterized in that: An adjustment pressure plate (33) is movably arranged in the adjustment groove (31), and the bottom surface of the adjustment pressure plate (33) is connected to the end of the second spring (32) away from the pressure ring (3). A plurality of adjustment threaded holes (34) are provided on the top of the pressure cover body (2), and each adjustment threaded hole (34) is connected to the adjustment groove (31). An adjustment screw (35) is threadedly connected in each adjustment threaded hole (34), and the bottom of each adjustment screw (35) is connected to the adjustment pressure plate (33).

9. The detachable and lubricable packing gland of a large-caliber electric butterfly valve according to claim 8 is characterized in that: The diameter of the oil filling hole (10) is larger than that of the inlet hole (14), and the diameter of the oil filling hole (10) is set to meet the requirements that when the pressure ring (3) moves in the mounting hole (13) under the action of the second spring (32) and the adjusting pressure plate (33), the oil filling hole (10) can always maintain communication with the inlet hole (14); the diameter of the chip removal hole (11) is larger than that of the outlet hole (15), and the diameter of the chip removal hole (11) is set to meet the requirements that when the pressure ring (3) moves in the mounting hole (13) under the action of the second spring (32) and the adjusting pressure plate (33), the chip removal hole (11) can always maintain communication with the outlet hole (15).

10. The detachable and lubricable packing gland of a large-caliber electric butterfly valve according to claim 6, characterized in that: A pressure sensor (36) is also embedded on the bottom wall of the pressure ring (3), and a detection end of the pressure sensor (36) is tightly arranged against the packing filler (30).

Images