High-pressure stop valve with inner limiting valve rod anti-rotation structure

Abstract

The utility model discloses a high-pressure stop valve with an inner limiting valve rod anti-rotation structure, and particularly relates to the technical field of stop valves, the high-pressure stop valve comprises a valve body, a valve rod, a support, a valve cover and a valve clack, and the support is fixedly connected with the valve body. The assembly efficiency of the stop valve is improved, the adjusting ring can be limited and fixed through the positioning assembly after assembly, the situation that the adjusting ring rotates accidentally, and consequently the mounting and fixing effect of the stop valve is affected is avoided, the first threaded sleeve and the second bolt can be limited in cooperation with use of the positioning rod, looseness is avoided, and the service life of the stop valve is prolonged. Connection and fixation between the second bolt and the first threaded sleeve are affected; due to the arrangement of the anti-rotation structure, the valve rod can be limited in an anti-rotation mode, and practicability is higher; and through the fixing assembly, the two second threaded sleeves can be synchronously adjusted to rotate, the second threaded sleeves and the first bolts are detached, the detaching efficiency is improved, and filler replacement is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of globe valves, and particularly relates to a high-pressure globe valve with an internal limit valve stem anti-rotation structure. Background Technique

[0002] The globe valve, also called a stop valve, is one of the most widely used valves. It is widely popular because of the small friction between the sealing surfaces during the opening and closing process, relatively durable, small opening height, easy to manufacture, convenient to repair, and applicable not only to medium and low pressures but also to high pressures. The closing principle of the globe valve is that relying on the valve stem pressure, the sealing surface of the valve flap is closely attached to the sealing surface of the valve seat to prevent the medium from flowing through; there are many types of globe valves, such as high-pressure globe valves. The traditional high-pressure self-sealing globe valve adopts a pressure self-tightening valve cover design. Its valve body and valve cover are connected by threads, sealed by an internal pressure self-sealing ring, and the valve stem is anti-rotation limited by a split anti-rotation block through a valve cover with guide ribs. It is designed to be high-pressure and heat-resistant, and is a globe valve applicable to high-temperature and high-pressure pipelines in thermal power plants, nuclear power plants, and petrochemical systems.

[0003] At present, during the use of the high-pressure self-sealing globe valve, due to the obvious unevenness on the surface of the guide ribs of the valve cover caused by the casting process, the friction between the anti-rotation block and the guide ribs increases or even jams when the valve operates. At this time, the torque of the valve increases or it cannot be opened or closed. In addition, it is often necessary to replace the packing of the valve. However, for the traditional high-pressure self-sealing globe valve, replacing the packing requires removing the anti-rotation device and the packing gland at the same time, which is time-consuming and laborious. Moreover, after removing the anti-rotation device, the anti-rotation of the valve stem fails. When replacing the packing, the valve stem may rotate, resulting in the failure of the upper seal and causing packing leakage, which is not safe; when the flanges at both ends of the globe valve are connected and fixed to the feed pipe and the discharge pipe through bolts, usually multiple bolts are respectively used in cooperation with the bolts for connection and fixation. However, this method is cumbersome to operate, has a relatively low assembly efficiency, is inconvenient to use, and has relatively poor practicability. Content of the Utility Model

[0004] The purpose of the utility model is to provide a high-pressure globe valve with an internal limit valve stem anti-rotation structure to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the present utility model provides the following technical solution: A high-pressure stop valve with an internal limit valve stem anti-rotation structure, comprising a valve body, a valve stem, a bracket, a valve cover, and a valve flap. The bracket is fixedly connected to the valve body. The valve stem is rotatably installed inside the bracket, and a handwheel is connected to the upper end of the valve stem and the outside of the bracket. The lower end of the valve stem is connected to the valve flap inside the valve body. The valve cover is movably sleeved outside the valve stem and is fixedly installed inside the lower end of the bracket. A packing groove is provided at the top of the valve cover. Connecting mechanisms are sleeved and installed on the outer sides of both ends of the valve body. An anti-rotation structure is provided between the valve flap and the valve cover inside the valve body. The anti-rotation structure includes an anti-rotation block, and the anti-rotation block is sleeved outside the valve stem. Arc grooves are provided at both ends of the anti-rotation block, and guide rods are provided in the arc grooves. The upper ends of the guide rods are threadedly connected to the bottom of the valve cover and spot-welded and fixed. Bolts I are symmetrically hinged at the lower end of the bracket. A packing pressing plate is sleeved outside the valve stem above the bolts I. A packing pressing sleeve is connected to the bottom of the packing pressing plate. Through holes adapted to the bolts I are provided at the top of the packing pressing plate. A fixing component is provided at the top of the packing pressing plate. The connecting mechanism includes fixing disks, and the fixing disks are symmetrically sleeved at corresponding positions on the outer sides of both ends of the valve body. Threaded sleeves I penetrating the fixing disks are rotatably embedded and installed at symmetric positions inside the fixing disks.

[0006] Furthermore, the connecting mechanism further includes an adjusting ring. An adjusting groove is provided on the outer wall of the fixing disk. The adjusting ring is rotatably installed in the adjusting groove. A plurality of tooth grooves meshing with gears are provided on the inner wall of the adjusting ring. A gear is sleeved outside the threaded sleeve I. A chamber adapted to the gear is provided inside the fixing disk, and the chamber communicates with the adjusting groove. Limiting rings are symmetrically provided on the outer wall of the adjusting ring. Annular rail grooves adapted to the limiting rings are symmetrically provided on the inner wall of the adjusting groove. A plurality of driving handles are symmetrically provided on the outer wall of the adjusting ring. A positioning component is provided on one side of the fixing disk away from the valve body end. A bolt II threadedly connected to the threaded sleeve I is provided on one side of the threaded sleeve I. The setting of the connecting mechanism can be synchronously connected to a plurality of bolt IIs, improving the disassembly and assembly efficiency of the stop valve, being convenient to use, and having stronger practicability.

[0007] Furthermore, the positioning component includes a reset seat, and the reset seat is fixedly installed on one side of the fixing disk. A support rod is provided inside the reset seat. A stop block is connected to the lower end of the support rod. A spring is sleeved outside the support rod above the stop block. The upper end of the support rod is rotatably connected to a limiting block outside the reset seat. One end of the limiting block is snapped into a card slot provided at the top of the adjusting ring, and a plurality of card slots are provided. The setting of the positioning component can limit and fix the fixing disk, avoiding accidental rotation from affecting the installation and fixing effect of the stop valve.

[0008] Furthermore, the fixing component includes a protective shell. Symmetrically-positioned threaded sleeves II that penetrate through the packing pressing plate are rotatably installed inside the packing pressing plate, and the upper ends of the threaded sleeves II are rotatably connected to the protective shell. The inner sides of the threaded sleeves II are threadedly connected to bolt I. Sprockets are sleeved on the outer walls of the threaded sleeves II inside the protective shell, and the two sprockets are connected by a chain. Symmetrically-arranged guide wheels are rotatably installed on the top of the packing pressing plate, and the guide wheels are arranged inside the chain. A hexagonal block is connected to the upper end of the threaded sleeve II outside the protective shell. The setting of the fixing component can conveniently drive the separation between the two threaded sleeves II and bolt I synchronously, improving the disassembly efficiency of the packing pressing plate when replacing the packing, and thus facilitating the quick replacement of the packing.

[0009] Furthermore, on one side of the fixing disk, positioning rods are symmetrically provided, and the positioning rods are hook-shaped. One end of the positioning rod is inserted into a hexagonal groove that matches the positioning rod and is opened at one end of bolt II.

[0010] Furthermore, the threaded sleeve II is rotatably connected to the packing pressing plate through a bearing. The guide wheels are located on both sides of the valve stem. A packing gasket, packing rings, and packing are sequentially arranged in the packing groove from bottom to top to support and limit the threaded sleeve II and enable it to rotate self. The setting of the guide wheels can guide the chain and prevent it from contacting the valve stem.

[0011] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows:

[0012] 1. Through the connection mechanism, the present utility model can conveniently and quickly connect or disassemble multiple bolt II and threaded sleeve I, improving the assembly efficiency of the globe valve, making it more convenient to use. And after assembly, the positioning component can be used to limit and fix the adjusting ring to prevent its accidental rotation, thus affecting the installation and fixing effect of the globe valve. With the use of the positioning rod, the limit of the threaded sleeve I and bolt II can be realized to prevent loosening and affect the connection and fixation between bolt II and threaded sleeve I. The setting of the anti-rotation structure can limit the anti-rotation of the valve stem, with stronger practicability;

[0013] 2. Through the fixing component, the present utility model can synchronously adjust the rotation of the two threaded sleeves II, so as to separate the threaded sleeve II and bolt I, improving the disassembly efficiency for replacing the packing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0015] Figure 1 is the overall structural schematic diagram of the present utility model;

[0016] Figure 2It is a schematic diagram of the partial side-sectional structure of the present utility model;

[0017] Figure 3 It is a schematic diagram of the structure between the anti-rotation block, valve stem and valve flap of the present utility model;

[0018] Figure 4 It is a schematic diagram of the structure between the fixed disk and the first thread sleeve of the present utility model;

[0019] Figure 5 It is the present utility model Figure 4 of the partial sectional structure schematic diagram;

[0020] Figure 6 It is the present utility model Figure 1 of the enlarged structure schematic diagram of A;

[0021] Figure 7 It is a schematic diagram of the internal structure of the protective shell of the present utility model;

[0022] In the figure: 1. Valve body; 2. Valve stem; 3. Bracket; 4. Valve cover; 5. Valve flap; 6. First bolt; 7. Packing pressing plate; 8. Packing sleeve; 9. Anti-rotation block; 10. Guide rod; 11. Fixed disk; 12. Adjusting ring; 13. First thread sleeve; 14. Gear; 15. Second bolt; 16. Limit ring; 17. Reset seat; 18. Support rod; 19. Stop block; 20. Spring; 21. Limit block; 22. Positioning rod; 23. Protective shell; 24. Second thread sleeve; 25. Sprocket; 26. Chain; 27. Guide wheel. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0024] Such as Figure 1 - Figure 7A high-pressure globe valve with an internal limit valve stem anti-rotation structure as shown, comprising a valve body 1, a valve stem 2, a bracket 3, a valve cover 4, and a valve flap 5. The bracket 3 is fixedly connected to the valve body 1. The valve stem 2 is rotatably installed inside the bracket 3, and a handwheel is connected to the outside of the bracket 3 at the upper end of the valve stem 2. The lower end of the valve stem 2 is connected to the valve flap 5 inside the valve body 1. The valve cover 4 is movably sleeved outside the valve stem 2 and is fixedly installed inside the lower end of the bracket 3. A packing groove is provided at the top of the valve cover 4. Connecting mechanisms are sleeved and installed on the outer sides of both ends of the valve body 1. An anti-rotation structure is provided between the valve flap 5 and the valve cover 4 inside the valve body 1. The anti-rotation structure includes an anti-rotation block 9, and the anti-rotation block 9 is sleeved outside the valve stem 2. Arc grooves are provided at both ends of the anti-rotation block 9, and guide rods 10 are provided inside the arc grooves. The upper ends of the guide rods 10 are threadedly connected to the bottom of the valve cover 4 and spot-welded and fixed. In this example, when the anti-rotation block 9 is sleeved on the valve stem 2, a sufficiently large static friction force along the circumferential tangential direction will be generated, which can ensure overcoming the torque of the valve stem 2 when the valve is opened or closed. By using the generated static friction force, when the valve stem 2 is not adjusted during work, it can play a role in preventing rotation for its limit. Bolts 6 are symmetrically hinged at the lower end of the bracket 3. A packing pressing plate 7 is sleeved outside the valve stem 2 above the bolts 6. A packing sleeve 8 is connected to the bottom of the packing pressing plate 7. Through holes adapted to the bolts 6 are provided at the top of the packing pressing plate 7. A fixing assembly is provided at the top of the packing pressing plate 7. The connecting mechanism includes fixing disks 11, and the fixing disks 11 are symmetrically sleeved on the outer sides of both ends of the valve body 1 at corresponding positions. Threaded sleeves 13 penetrating the fixing disks 11 are rotatably embedded and installed at symmetric positions inside the fixing disks 11. In this example, the connecting mechanism further includes an adjusting ring 12. An adjusting groove is provided on the outer wall of the fixing disk 11, and the adjusting ring 12 is rotatably installed inside the adjusting groove. A plurality of tooth grooves meshing with gears 14 are provided on the inner wall of the adjusting ring 12. Gears 14 are sleeved outside the threaded sleeves 13. A chamber adapted to the gears 14 is provided inside the fixing disk 11, and the chamber communicates with the adjusting groove. Limiting rings 16 are symmetrically provided on the outer wall of the adjusting ring 12. Annular rail grooves adapted to the limiting rings 16 are symmetrically provided on the inner wall of the adjusting groove. A plurality of driving handles are symmetrically provided on the outer wall of the adjusting ring 12. A positioning assembly is provided on one side of the fixing disk 11 away from the end of the valve body 1. A bolt 15 threadedly connected to the threaded sleeve 13 is provided on one side of the threaded sleeve 13. The setting of the connecting mechanism can be connected to a plurality of bolts 15 synchronously, improving the disassembly and assembly efficiency of the globe valve, being convenient to use, and having stronger practicability. In this example, the positioning assembly includes a reset seat 17, and the reset seat 17 is fixedly installed on one side of the fixing disk 11. A support rod 18 is provided inside the reset seat 17. A stop block 19 is connected to the lower end of the support rod 18. A spring 20 is sleeved outside the support rod 18 above the stop block 19. The upper end of the support rod 18 is rotatably connected to a limiting block 21 outside the reset seat 17. One end of the limiting block 21 is snapped into a card slot provided at the top of the adjusting ring 12, and a plurality of card slots are provided. The setting of the positioning assembly can limit and fix the fixing disk 11, avoiding accidental rotation from affecting the installation and fixing effect of the globe valve.In this example, the fixing component includes a protective shell 23. Threaded sleeves II 24 penetrating the packing pressing plate 7 are rotatably installed at symmetric positions inside the packing pressing plate 7. The upper ends of the threaded sleeves II 24 are rotatably connected to the protective shell 23. The inner sides of the threaded sleeves II 24 are threadedly connected to bolts I 6. Sprockets 25 are sleeved on the outer walls of the threaded sleeves II 24 inside the protective shell 23. The two sprockets 25 are connected by a chain 26. Guide wheels 27 are symmetrically and rotatably installed at the top of the packing pressing plate 7, and the guide wheels 27 are arranged inside the chain 26. A hexagonal block is connected to the upper end of the threaded sleeve II 24 outside the protective shell 23. The setting of the fixing component can conveniently drive the separation between the two threaded sleeves II 24 and the bolts I 6 synchronously, so as to improve the disassembly efficiency of the packing pressing plate 7 when replacing the packing, and thus facilitate the quick replacement of the packing.

[0025] In this example, positioning rods 22 are symmetrically arranged on one side of the fixed disk 11, and the positioning rods 22 are hook-shaped. One end of the positioning rod 22 is inserted into a hexagonal groove opened at one end of the bolt II 15 and adapted to the positioning rod 22. In this example, the threaded sleeve II 24 is rotatably connected to the packing pressing plate 7 through a bearing. The guide wheels 27 are located on both sides of the valve stem 2. A packing gasket, packing yarn and packing are sequentially arranged in the packing groove from bottom to top to support and limit the threaded sleeve II 24 and enable it to rotate. The setting of the guide wheels 27 can guide the chain 26 to prevent it from contacting the valve stem 2.

[0026] Working principle of the utility model: When in use, when it is necessary to install the globe valve, multiple bolts II 15 can pass through the flange on the pipeline to be connected and the flange on the valve body 1, and then pull the limit block 21 to drive the support rod 18 and then drive the stopper 19 to squeeze the spring 20, so that after the limit block 21 moves out of the card slot, rotate the limit block 21 to one side of the fixed disk 11, and then rotate the driving adjustment ring 12 through the drive. At the same time, the adjustment ring 12 will drive the limit ring 16 to rotate. The adjustment ring 12 drives the gear 14 through a number of tooth grooves provided on the inner side to drive the thread sleeve I 13 to rotate, so that the thread sleeve I 13 is threadedly connected with the corresponding bolt II 15, so as to realize the connection and fixation between the globe valve and the pipeline. While the bolt II 15 gradually approaches the valve body 1, one end of the positioning rod 22 will be inserted into the hexagonal groove, so as to limit the bolt II 15 and make it non-rotatable. At the same time, repeat the above operation on the limit block 21. After the limit block 21 corresponds to the card slot on the adjustment ring 12, release the pulling force on the limit block 21, so that the stopper 19 drives the limit block 21 to reset under the elastic force of the spring 20, and the limit block 21 is snapped into the corresponding card slot, so as to limit and fix the adjustment ring 12 and prevent it from accidentally rotating and affecting the installation and fixation effect of the globe valve. With the cooperation of the positioning rod 22 to limit the bolt II 15, the connection between the bolt II 15 and the thread sleeve I 13 can be prevented from loosening and affecting the installation and fixation of the globe valve. It is convenient to use and has a better fixation effect. In addition, the anti-rotation structure can prevent the valve stem 2 from being unable to rotate due to its influence during the rotation operation. When it does not need to rotate and adjust, the static friction force between the anti-rotation block 9 and the valve stem 2 can be used to prevent the valve stem 2 from rotating. When it is necessary to disassemble the packing gland 7 to replace the filled packing, a hexagonal wrench can be used to cooperate with the hexagonal block connected to the upper end of the thread sleeve II 24 to rotate the thread sleeve II 24, so as to drive the two thread sleeves II 24 to rotate synchronously through the transmission of the sprocket 25 and the chain 26, that is, the two thread sleeves II 24 can be separated from the two bolts I 6 at the same time, improving the disassembly efficiency. After the bolt I 6 and the thread sleeve II 24 are disassembled, the packing gland 7 can be pulled up to drive the packing sleeve 8 to move up synchronously, and then the packing in the packing groove can be replaced. It is convenient to use and has stronger practicability.

[0027] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A high-pressure stop valve with an internal limit valve stem anti-rotation structure, comprising a valve body (1), a valve stem (2), a bracket (3), a valve cover (4), and a valve disc (5), wherein the bracket (3) is fixedly connected to the valve body (1), the valve stem (2) is rotatably mounted on the inner side of the bracket (3), and a hand wheel is connected between the upper end of the valve stem (2) and the outer side of the bracket (3), the lower end of the valve stem (2) is connected to the valve disc (5) in the valve body (1), the valve cover (4) is movably sleeved on the outer side of the valve stem (2), and the valve cover (4) is fixedly mounted on the inner side of the lower end of the bracket (3), and a packing groove is provided on the top of the valve cover (4), characterized in that: The outer sides of both ends of the valve body (1) are sleeved with connecting mechanisms, an anti-rotation structure is provided between the valve disc (5) and the valve cover (4) in the valve body (1), and the anti-rotation structure includes an anti-rotation block (9), and the anti-rotation block (9) is sleeved on the outer side of the valve stem (2), arc grooves are provided at both ends of the anti-rotation block (9), and a guide rod (10) is provided in the arc groove, the upper end of the guide rod (10) is threadedly connected to the bottom of the valve cover (4) and fixed by spot welding, the lower end of the bracket (3) is hinged with a bolt (6) at a symmetrical position, and the outer side of the valve stem (2) is provided with an anti-rotation block (9). A packing pressure plate (7) is sleeved on the side above the bolt one (6), and a packing pressure sleeve (8) is connected to the bottom of the packing pressure plate (7). A through hole adapted to the bolt one (6) is opened on the top of the packing pressure plate (7). A fixing component is provided on the top of the packing pressure plate (7). The connecting mechanism includes a fixing disk (11), and the fixing disk (11) is symmetrically sleeved on corresponding positions on the outer sides of the two ends of the valve body (1). A threaded sleeve (13) penetrating the fixing disk (11) is rotatably embedded and installed at symmetrical positions inside the fixing disk (11).

2. A high-pressure stop valve with an internal limit valve stem anti-rotation structure according to claim 1, characterized in that: The connecting mechanism further comprises an adjusting ring (12), an adjusting groove is provided on the outer wall of the fixing plate (11), an adjusting ring (12) is rotatably mounted in the adjusting groove, a plurality of tooth grooves meshing with the gear (14) are provided on the inner wall of the adjusting ring (12), a gear (14) is sleeved on the outer side of the threaded sleeve (13), a chamber adapted to the gear (14) is provided inside the fixing plate (11), and the chamber is communicated with the adjusting groove, a limiting ring (16) is symmetrically provided on the outer wall of the adjusting ring (12), an annular track groove adapted to the limiting ring (16) is symmetrically provided on the inner wall of the adjusting groove, a plurality of driving handles are symmetrically provided on the outer wall of the adjusting ring (12), a positioning assembly is provided on one side of the fixing plate (11) away from the end of the valve body (1), and a bolt (15) threadedly connected to the threaded sleeve (13) is provided on one side of the threaded sleeve (13).

3. A high-pressure stop valve with an internal limit valve stem anti-rotation structure according to claim 2, characterized in that: The positioning assembly comprises a reset seat (17), and the reset seat (17) is fixedly installed on one side of the fixed plate (11), a support rod (18) is arranged inside the reset seat (17), a stopper (19) is connected to the lower end of the support rod (18), a spring (20) is sleeved on the outer side of the support rod (18) above the stopper (19), the upper end of the support rod (18) is rotatably connected to a limit block (21) outside the reset seat (17), one end of the limit block (21) is clamped into a clamping groove provided on the top of the adjusting ring (12), and a plurality of clamping grooves are provided.

4. A high-pressure stop valve with an internal limit valve stem anti-rotation structure according to claim 1, characterized in that: The fixing assembly comprises a protective shell (23), threaded sleeves (24) penetrating the packing pressure plate (7) are rotatably mounted at symmetrical positions inside the packing pressure plate (7), and the upper end of the threaded sleeve (24) is rotatably connected to the protective shell (23), the inner side of the threaded sleeve (24) is threadedly connected to the bolt (6), a sprocket (25) is mounted on the outer wall of the threaded sleeve (24) inside the protective shell (23), and the two sprockets (25) are connected by a chain (26), a symmetrically arranged guide wheel (27) is rotatably mounted on the top of the packing pressure plate (7), and the guide wheel (27) is arranged on the inner side of the chain (26), and a hexagonal block is connected between the upper end of the threaded sleeve (24) and the outer side of the protective shell (23).

5. A high-pressure stop valve with an internal limit valve stem anti-rotation structure according to claim 2, characterized in that: A positioning rod (22) is symmetrically provided on one side of the fixing plate (11), and the positioning rod (22) is hook-shaped. One end of the positioning rod (22) is inserted into a hexagonal groove formed at one end of the second bolt (15) and adapted to the positioning rod (22).

6. A high-pressure stop valve with an internal limit valve stem anti-rotation structure according to claim 4, characterized in that: The second threaded sleeve (24) is rotatably connected to the packing pressure plate (7) via a bearing, the guide wheel (27) is located on both sides of the valve stem (2), and the packing groove is provided with a packing pad, a packing and a packing in sequence from bottom to top.

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