Sealing structure capable of replacing filler on line

Abstract

The utility model discloses a sealing structure capable of replacing packing on line. The sealing structure is used for sealing a gap between a valve cover and a valve rod. Comprising a first packing assembly, a second packing assembly and a third packing assembly, a lower packing cavity and an upper packing cavity are sequentially formed between a valve cover and a valve rod from bottom to top, and the first packing assembly comprises first packing, a first shaft sleeve, a supporting ring, a first pressing sleeve and a first pressing plate; the second filler assembly comprises a second shaft sleeve, a second filler, a second pressing sleeve and a second pressing plate; the third packing assembly comprises a third shaft sleeve, third packing, a third pressing sleeve and a third pressing plate. According to the utility model, the valve filler can be replaced on line under the condition that the pipeline has pressure, so that the operation is simple, the production task cannot be interrupted, and the production efficiency is prevented from being influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a sealing structure of a valve with online replaceable filler. Background Art

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and regulate and control the parameters of the conveyed medium (temperature, pressure, and flow). Based on their function, they can be categorized as shutoff valves, check valves, and regulating valves. Shutoff valves, which function as opening and closing valves, are commonly located at the inlet and outlet of cooling and heating sources, equipment inlets and outlets, and pipeline branches (including risers). They can also serve as drain valves and air release valves. Common shutoff valves include gate valves, globe valves, ball valves, and butterfly valves.

[0003] In existing shut-off valves, packing is usually arranged between the valve stem and the valve cover to ensure a good seal between the two. Specifically, a packing cavity is provided on the valve cover, and packing is loaded into the packing cavity. The packing pressure plate is connected to the valve cover by a slipknot bolt. The valve cover applies pressure to the packing sleeve, and the packing sleeve presses the packing into the seasoning cavity to ensure the sealing between the valve cover and the valve stem.

[0004] However, after long-term use, the packing sealing structure will age and the sealing performance will deteriorate. At this time, the packing needs to be replaced. However, when replacing the packing, the system needs to be shut down first, the pressure in the pipeline needs to be relieved, and then the valve packing can be replaced. This is not only troublesome to operate, but also causes production tasks to be interrupted and reduces production efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a sealing structure with online replaceable packing. The utility model can replace the valve packing online when the pipeline is under pressure. It is not only simple to operate, but also will not cause production tasks to be interrupted, avoiding the impact on production efficiency.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sealing structure with online replaceable packing, which is used for sealing the gap between the valve cover and the valve stem; it includes a first packing assembly, a second packing assembly and a third packing assembly, and a packing lower cavity and a packing upper cavity are sequentially provided between the valve cover and the valve stem from bottom to top, the first packing assembly includes a first packing, a first shaft sleeve, a support ring, a first pressing sleeve and a first pressure plate, the first pressure plate is connected to the valve cover, and the first pressure plate is pressed on the upper end of the first pressing sleeve, the first pressing sleeve is pressed on the upper end of the support ring, the support ring is pressed on the upper end of the first shaft sleeve, and the first shaft sleeve presses the first packing in the packing lower cavity, The first pressing sleeve divides the upper cavity of the packing into an inner groove and an outer groove. The second packing assembly includes a second sleeve, a second packing, a second pressing sleeve and a second pressure plate. The second pressure plate is connected to the valve cover and the second pressure plate is pressed on the upper end of the second pressing sleeve. The second sleeve is arranged in the inner groove of the upper end of the support ring. The second packing is clamped between the second pressing sleeve and the second sleeve. The third packing assembly includes a third sleeve, a third packing, a third pressing sleeve and a third pressure plate. The third pressure plate is connected to the valve cover and the third pressure plate is pressed on the upper end of the third pressing sleeve. The third sleeve is arranged in the outer groove of the upper end of the support ring. The third packing is clamped between the third pressing sleeve and the third sleeve.

[0007] By adopting the above technical solution, three packing sealing assemblies are set up, among which, when the second and third packing sealing assemblies leak, the packing can be replaced online. That is, since the first packing sealing assembly always keeps the gap between the valve cover and the valve cover sealed, even when there is internal pressure in the pipeline, the packing in the second sealing assembly or the third sealing assembly can be replaced, and the sealing performance is better. Moreover, since the packing can be replaced online, it is not only simple to operate, but also will not cause interruption of production tasks, thereby avoiding affecting production efficiency.

[0008] The present invention is further configured to include multiple first screws, multiple screw holes are provided at the upper end of the valve cover, the bottom ends of the first screws are threadedly connected to the corresponding screw holes, the first pressure plate, the second pressure plate and the third pressure plate are respectively provided with a first through hole, a second through hole and a third through hole for the first screw to pass through, and the first screw is also threadedly connected with a first nut, a second nut and a third nut, and the first nut, the second nut and the third nut are respectively pressed against the upper ends of the first pressure plate, the second pressure plate and the third pressure plate.

[0009] By adopting the above technical solution, the first pressing plate, the second pressing plate and the third pressing plate can be locked by tightening the first nut, the second nut and the third nut respectively, which is convenient for replacing the packing.

[0010] The present invention is further configured such that a plurality of washers are sandwiched between the second nut and the second pressing plate.

[0011] By adopting the above technical solution, the stability of the three nuts after tightening can be improved, and the loosening prevention effect can be achieved.

[0012] The present invention is further configured such that the upper end of the first screw is provided with a hexagonal groove.

[0013] By adopting the above technical solution, it is convenient for the hexagonal screwdriver to rotate the first screw rod, which is more conducive to disassembly and assembly.

[0014] The utility model is further configured such that a mounting ring is welded to the upper end of the valve cover, a connecting ring is provided on the inner side of the mounting ring, and a sealing ring is sandwiched between the connecting ring and the upper end of the valve cover, and a plurality of screws extending radially for connection with the connecting ring are distributed in a circumferential array on the mounting ring, and the screw holes are provided at the upper end of the connecting ring.

[0015] By adopting the above technical solution, after long-term use, the threads at the screw holes are easily damaged, and the connecting ring can be directly replaced to avoid replacing the entire valve cover, thereby reducing the subsequent maintenance costs.

[0016] The present invention is further configured such that an adjustable ring is threadedly connected to the outer periphery of the first sleeve, and the upper end of the adjustable ring is tightly pressed against the bottom end of the support ring.

[0017] By adopting the above technical solution, the adjustable ring can be rotated to adjust the axial length of the first sleeve, ensuring that the first sleeve and the support ring fit tightly together and avoiding a gap between the two due to processing errors.

[0018] The utility model is further configured such that the first pressure plate, the second pressure plate and the third pressure plate are all composed of a left half ring and a right half ring connected together by fasteners, and a plurality of positioning protrusions are provided on the end face of the right half ring close to the left half ring, and a plurality of positioning grooves that fit with the positioning protrusions are provided on the end face of the left half ring close to the right half ring.

[0019] By adopting the above technical solution, disassembly and assembly are very convenient, and the pressure plate can be removed without taking out the nut to provide a larger operating space for replacing the packing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0022] Figure 3 This is a cross-sectional view of the first pressing plate of the present invention.

[0023] In the figure: 1, valve cover; 2, valve stem; 3, first packing assembly; 4, second packing assembly; 5, third packing assembly; 6, packing upper cavity; 7, first packing; 8, first shaft sleeve; 9, support ring; 10, first pressing sleeve; 11, first pressure plate; 12, inner groove; 13, outer groove; 14, second shaft sleeve; 15, second packing; 16, second pressing sleeve; 17, second pressure plate; 18, third shaft sleeve; 19, third packing; 20, third pressing sleeve; 21, third pressure Plate; 22. First screw; 23. Screw hole; 24. First through hole; 25. Second through hole; 26. Third through hole; 27. First nut; 28. Second nut; 29. ​​Third nut; 30. Washer; 31. Hexagon socket; 32. Mounting ring; 33. Connecting ring; 34. Sealing ring; 35. Screw; 36. Adjustable ring; 37. Left half ring; 38. Right half ring; 39. Fastener; 40. Positioning protrusion; 41. Positioning groove; 42. Filling lower cavity. DETAILED DESCRIPTION

[0024] 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.

[0025] Example: As shown in the attached Figures 1 to 3The sealing structure shown in the figure is a sealing structure with replaceable packing online, which is used to replace and seal the gap between the valve cover 1 and the valve stem 2; the sealing structure includes a first packing assembly 3, a second packing assembly 4 and a third packing assembly 5, and a packing lower cavity 42 and a packing upper cavity 6 are provided between the valve cover 1 and the valve stem 2 from bottom to top, the first packing assembly 3 includes a first packing 7, a first shaft sleeve 8, a support ring 9, a first pressing sleeve 10 and a first pressing plate 11, the first pressing plate 11 is connected to the valve cover 1, and the first pressing plate 11 is pressed on the upper end of the first pressing sleeve 10, the first pressing sleeve 10 is pressed on the upper end of the support ring 9, the support ring 9 is pressed on the upper end of the first shaft sleeve 8, and an elastic pad can be clamped between the support ring 9 and the first shaft sleeve 8, the first shaft sleeve 8 presses the first packing 7 into the packing lower cavity 42, and the first pressing sleeve 10 divides the packing upper cavity 6 into an inner groove 12 and an outer groove 13. The second packing assembly 4 includes a second sleeve 14, a second packing 15, a second pressing sleeve 16 and a second pressure plate 17, the second pressure plate 17 is connected to the valve cover 1, and the second pressure plate 17 is pressed on the upper end of the second pressing sleeve 16, the second sleeve 14 is arranged in the inner groove 12 at the upper end of the support ring 9, and the second packing 15 is clamped between the second pressing sleeve 16 and the second sleeve 14; the third packing assembly 5 includes a third sleeve 18, a third packing 19, a third pressing sleeve 20 and a third pressure plate 21, the third pressure plate 21 is connected to the valve cover 1, and the third pressure plate 21 is pressed on the upper end of the third pressing sleeve 20, the third sleeve 18 is arranged in the outer groove 13 at the upper end of the support ring 9, and the third packing 19 is clamped between the third pressing sleeve 20 and the third sleeve 18, wherein the second pressure plate 17, the first pressure plate 11 and the third pressure plate 21 are arranged in sequence from top to bottom. By setting up three packing sealing assemblies, among which, when the second and third packing sealing assemblies leak, the packing can be replaced online. That is, since the first packing sealing assembly 7 always keeps the gap between the valve cover 1 and the valve cover 1 sealed, even when there is internal pressure in the pipeline, the packing in the second sealing assembly or the third sealing assembly can be replaced, and the sealing performance is better. Moreover, since the packing can be replaced online, it is not only simple to operate, but also will not cause interruption of production tasks, thereby avoiding affecting production efficiency.

[0026] As attached Figure 1As shown, the sealing structure also includes a plurality of first screws 22. The upper end of the valve cover 1 is provided with a plurality of screw holes 23. The bottom ends of the first screws 22 are threadedly connected to the corresponding screw holes 23. The first pressure plate 11, the second pressure plate 17, and the third pressure plate 21 are respectively provided with a first through hole 24, a second through hole 25, and a third through hole 26 for the first screws 22 to pass through. The first screws 22 are also threadedly connected with a first nut 27, a second nut 28, and a third nut 29. The first nut 27, the second nut 28, and the third nut 29 are respectively tightened against the upper ends of the first pressure plate 11, the second pressure plate 17, and the third pressure plate 21. Tightening the first nut 27, the second nut 28, and the third nut 29 respectively can lock the first pressure plate 11, the second pressure plate 17, and the third pressure plate 21, facilitating the replacement of the packing.

[0027] As attached Figure 1 As shown, a plurality of washers 30 are sandwiched between the second nut 28 and the second pressing plate 17. This design can improve the stability of the three nuts after tightening and play a role in preventing loosening.

[0028] As attached Figure 1 As shown, the upper end of the first screw rod 22 is provided with a hexagonal groove 31. This design facilitates the hexagonal screwdriver to rotate the first screw rod 22, which is more conducive to disassembly and assembly.

[0029] As attached Figure 1 As shown, a mounting ring 32 is welded to the upper end of the valve cover 1. A connecting ring 33 is disposed inside the mounting ring 32. A sealing ring 34 is sandwiched between the connecting ring 33 and the upper end of the valve cover 1. A plurality of radially extending screws 35 for connection to the connecting ring 33 are distributed in a circumferential array on the mounting ring 32. The screw holes 23 are disposed at the upper end of the connecting ring 33. After long-term use, the threads of the screw holes 23 are easily damaged. The connecting ring 33 can be directly replaced, avoiding the need to replace the entire valve cover 1, reducing subsequent maintenance costs.

[0030] As attached Figure 1 and attached Figure 2 As shown, an adjustable ring 36 is threadedly connected to the outer periphery of the first sleeve 8, and the upper end of the adjustable ring 36 is tightly abutted against the lower end of the support ring 9. The adjustable ring 36 can be rotated to adjust the axial length of the first sleeve 8 to ensure a tight fit between the first sleeve 8 and the support ring 9, avoiding any gap between them due to machining errors.

[0031] As attached Figure 3As shown, the first pressure plate 11, the second pressure plate 17, and the third pressure plate 21 are each composed of a left half-ring 37 and a right half-ring 38 connected together by fasteners 39. The end surface of the right half-ring 38 near the left half-ring 37 is provided with multiple positioning protrusions 40, and the end surface of the left half-ring 37 near the right half-ring 38 is provided with multiple positioning grooves 41 that fit into the positioning protrusions 40. The fasteners 39 can be a combination of a screw and a nut. The left and right half-rings 37 and 38 each have corresponding through-holes extending transversely, through which the screw passes. A nut is tightened at each end of the screw, and the two nuts are respectively tightened against the left and right half-rings 37 and 38. At least two sets of fasteners 39 are provided, thereby locking the left and right half-rings 37 and 38. This structure is very convenient for assembly and disassembly. The pressure plates can be removed without removing the nuts, providing more space for replacing the packing.

Claims

1. A sealing structure with online replaceable packing, used for sealing the gap between a valve cover (1) and a valve stem (2); characterized in that: The invention comprises a first packing assembly (3), a second packing assembly (4) and a third packing assembly (5), wherein a packing lower cavity (42) and a packing upper cavity (6) are sequentially provided between the valve cover (1) and the valve stem (2) from bottom to top, wherein the first packing assembly (3) comprises a first packing (7), a first shaft sleeve (8), a support ring (9), a first pressing sleeve (10) and a first pressure plate (11), wherein the first pressure plate (11) is connected to the valve cover (1), and the first pressure plate (11) is pressed on the upper end of the first pressing sleeve (10), the first pressing sleeve (10) is pressed on the upper end of the support ring (9), the support ring (9) is pressed on the upper end of the first shaft sleeve (8), the first shaft sleeve (8) presses the first packing (7) in the packing lower cavity (42), the first pressing sleeve (10) divides the packing upper cavity (6) into an inner groove (12) and an outer groove (13), and the second packing assembly (4) comprises a second shaft sleeve ( 14), a second packing (15), a second pressing sleeve (16) and a second pressure plate (17), wherein the second pressure plate (17) is connected to the valve cover (1), and the second pressure plate (17) is pressed on the upper end of the second pressing sleeve (16), the second shaft sleeve (14) is arranged in the inner groove (12) at the upper end of the support ring (9), and the second packing (15) is sandwiched between the second pressing sleeve (16) and the second shaft sleeve (14); the third packing assembly (5) includes a third shaft sleeve (18), a third packing (19), a third pressing sleeve (20) and a third pressure plate (21), wherein the third pressure plate (21) is connected to the valve cover (1), and the third pressure plate (21) is pressed on the upper end of the third pressing sleeve (20), the third shaft sleeve (18) is arranged in the outer groove (13) at the upper end of the support ring (9), and the third packing (19) is sandwiched between the third pressing sleeve (20) and the third shaft sleeve (18).

2. The sealing structure with online replaceable packing according to claim 1, characterized in that: The valve cover (1) further comprises a plurality of first screw rods (22), a plurality of screw holes (23) are provided at the upper end of the valve cover (1), the bottom ends of the first screw rods (22) are threadedly connected to the corresponding screw holes (23), the first pressure plate (11), the second pressure plate (17) and the third pressure plate (21) are respectively provided with a first through hole (24), a second through hole (25) and a third through hole (26) for the first screw rods (22) to pass through, the first screw rod (22) is also threadedly connected with a first nut (27), a second nut (28) and a third nut (29), the first nut (27), the second nut (28) and the third nut (29) are respectively pressed against the upper ends of the first pressure plate (11), the second pressure plate (17) and the third pressure plate (21).

3. The sealing structure with online replaceable packing according to claim 2, characterized in that: A plurality of washers (30) are sandwiched between the second nut (28) and the second pressing plate (17).

4. The sealing structure with online replaceable packing according to claim 2, characterized in that: The upper end of the first screw (22) is provided with a hexagonal inner groove (31).

5. The sealing structure with online replaceable packing according to claim 2, characterized in that: A mounting ring (32) is welded to the upper end of the valve cover (1), a connecting ring (33) is provided inside the mounting ring (32), and a sealing ring (34) is sandwiched between the connecting ring (33) and the upper end of the valve cover (1), a plurality of screws (35) extending radially for connection with the connecting ring (33) are distributed in a circumferential array on the mounting ring (32), and the screw hole (23) is provided at the upper end of the connecting ring (33).

6. The sealing structure with online replaceable packing according to claim 1, characterized in that: The outer periphery of the first shaft sleeve (8) is threadedly connected to an adjustable ring (36), and the upper end of the adjustable ring (36) is tightly abutted against the bottom end of the support ring (9).

7. The sealing structure with online replaceable packing according to claim 1, characterized in that: The first pressing plate (11), the second pressing plate (17) and the third pressing plate (21) are all composed of a left half ring (37) and a right half ring (38) connected together by a fastener (39), and a plurality of positioning protrusions (40) are provided on the end surface of the right half ring (38) close to the left half ring (37), and a plurality of positioning grooves (41) that fit with the positioning protrusions (40) are provided on the end surface of the left half ring (37) close to the right half ring (38).

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