Adjustable stab mitigation choke

Abstract

The present application provides an adjustable anti-puncture throttling valve, relates to the technical field of well blowout testing, and comprises a valve body, an end seat, a valve rod, an adjustable valve core, a fixed valve core, a first connecting pipe, a second connecting pipe and a distance adjusting structure. The structure of the valve core is improved, the adjustable valve core and the fixed valve core that can rotate are arranged, the first arc-shaped groove hole is arranged on the adjustable valve core, the second arc-shaped groove hole is arranged on the fixed valve core, the overlapping area of the first arc-shaped groove hole and the second arc-shaped groove hole is the actual throttling channel of the throttling valve, the throttling channel is in the shape of a circle or an arc-shaped groove hole, compared with the throttling channel in the shape of a traditional annular gap, the throttling channel has the advantage that it is not easy to be blocked, the inner side of the first connecting pipe is provided with a first anti-puncture alloy sleeve, the inner side of the second connecting pipe is provided with a second anti-puncture alloy sleeve, and the anti-puncture effect is good.

Description

Technical Field

[0001] This invention relates to the field of marine well blowout testing technology, specifically to an adjustable anti-stab throttle valve. Background Technology

[0002] Currently, during offshore well blowout testing, high pressure and formation backflow of mud and plugging slurry can easily cause process erosion or blockage. Using fixed throttle valves requires changing the nozzles according to the work schedule, resulting in frequent personnel entering the high-pressure area, which poses a high safety risk. On the other hand, using ordinary adjustable throttle valves is problematic because they lack erosion resistance and the annular gap of the throttle channel makes them prone to blockage. Therefore, this invention provides an adjustable anti-erosion throttle valve suitable for offshore well blowout testing. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an adjustable anti-stab throttle valve, which solves the problems of high pressure and formation backflow of mud during offshore well blowout testing, which can easily cause process corrosion or blockage. Using a fixed throttle valve requires changing the nozzle according to the working schedule, resulting in frequent personnel entering the high-pressure area, which poses a high safety risk. On the other hand, using an ordinary adjustable throttle valve has two problems: firstly, its corrosion resistance is insufficient, and secondly, the throttle channel has a small annular gap that is prone to blockage.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an adjustable anti-stab throttle valve, comprising:

[0005] The valve body has a through-hole valve cavity along the axial direction, and an inlet communicating with the through-hole valve cavity is provided on the side of the valve body. A first limiting ring is fixedly connected to the inner wall of the through-hole valve cavity and on the right side of the junction of the through-hole valve cavity and the inlet.

[0006] An end seat is fixedly connected to the left end of the valve body by a bolt group, and the main body of the end seat extends into the interior of the through-hole valve cavity. The inner side of the end seat has a central hole.

[0007] A valve stem passes through the center hole of the end seat and is rotatably connected to the end seat. One end of the valve stem is located on the left side of the end seat and is fixedly connected to a handwheel. The other end of the valve stem is located inside the through-hole valve cavity and is provided with a hexagonal part.

[0008] An adjustable valve core and a fixed valve core are both located inside a through-hole valve cavity, and both are located on the right side of a first limiting ring. The adjustable valve core is closer to the first limiting ring. The end face of the adjustable valve core has a first arc-shaped slot, and the end face of the fixed valve core has a second arc-shaped slot. The end face of the adjustable valve core near the hexagonal part has a first hexagonal slot, and one end of the hexagonal part is inserted into the first hexagonal slot. A threaded hole is provided on the side of the valve body at a position corresponding to the location of the fixed valve core. A clamping screw is threaded into the threaded hole, and one end of the clamping screw is pressed against the side of the fixed valve core.

[0009] A first connecting pipe and a second connecting pipe are coaxially arranged and fixedly connected by an adjustable gap structure. A first puncture-resistant alloy sleeve is provided on the inner side of the first connecting pipe. A first limiting part is fixedly connected to the outer side of the first puncture-resistant alloy sleeve at the end of the first connecting pipe away from the second connecting pipe. A second puncture-resistant alloy sleeve is provided on the inner side of the second connecting pipe. A second limiting part is fixedly connected to the outer side of the second puncture-resistant alloy sleeve at the end of the second connecting pipe away from the first connecting pipe. One end of the first puncture-resistant alloy sleeve is inserted into the interior of the second puncture-resistant alloy sleeve, and the second puncture-resistant alloy sleeve and the first puncture-resistant alloy sleeve are slidably connected. The outer joint of the second puncture-resistant alloy sleeve and the first puncture-resistant alloy sleeve is located on the inner side of the first connecting pipe. The end of the first connecting pipe away from the second connecting pipe is fixedly connected to the right end of the valve body by a bolt group, and the central hole of the first connecting pipe communicates with the right end of the through-hole valve cavity.

[0010] Preferably, the left end of the end seat is provided with a sealing installation port, the inner side of the sealing installation port is provided with a sealing bearing, the left end of the sealing installation port is threaded with a sealing extrusion cap, the sealing extrusion cap has a central hole, the valve stem is fixedly connected to the inner wall of the sealing bearing, the valve stem passes through the central hole of the sealing extrusion cap, and a sealing ring is provided between the end seat and the valve body connection surface.

[0011] Preferably, the left end of the valve stem is provided with a threaded portion, and the handwheel is threadedly connected to the threaded portion.

[0012] Preferably, the adjustment structure includes:

[0013] The first flange at the right end of the first connecting pipe and the second flange at the left end of the second connecting pipe, wherein the end of the first flange is provided with a first through hole and the end of the second flange is provided with a second through hole, and the first flange and the second flange are distributed parallel to each other at intervals.

[0014] A double-ended screw, wherein the double-ended screw is located between the first flange and the second flange, and one end of the double-ended screw passes through the first through hole and is threadedly connected to the first clamping nut, and the other end of the double-ended screw passes through the second through hole and is threadedly connected to the second clamping nut;

[0015] The first inner support nut and the second inner support nut are both threadedly connected to the portion of the double-ended screw located between the first flange and the second flange. The first inner support nut is fixedly connected to a first gear part at one end facing the second inner support nut, and the second inner support nut is fixedly connected to a second gear part at one end facing the first inner support nut.

[0016] An inner support ring is sleeved on the outside of the second puncture-resistant alloy sleeve. Two annular mounting grooves are opened on the outer side of the inner support ring. An mounting shaft is fixedly connected to the outer side of the inner support ring between the two annular mounting grooves. A bevel gear is rotatably connected to the end of the mounting shaft.

[0017] A first gear ring and a second gear ring, both with retaining rings fixedly connected to their inner sides. The retaining rings of the first and second gear rings are rotatably connected to two annular mounting grooves, respectively. A first bevel gear is fixedly connected to the side of the first gear ring closest to the second gear ring, and a second bevel gear is fixedly connected to the side of the second gear ring closest to the first gear ring. The bevel gear is located between the first and second bevel gears and meshes with both of them. The first gear ring meshes with the first gear part, and the second gear ring meshes with the second gear part.

[0018] Preferably, the bevel gear has a mounting hole at the end near the mounting shaft, and a second hexagonal slot at the end away from the mounting shaft.

[0019] Preferably, the inner surfaces of both the second puncture-resistant alloy sleeve and the first puncture-resistant alloy sleeve are smooth surfaces.

[0020] Preferably, both ends of the first connecting pipe and both ends of the second connecting pipe are provided with connecting flanges.

[0021] Preferably, the central angles corresponding to the first arc-shaped slot and the second arc-shaped slot are both less than 180°.

[0022] Preferably, a tapered opening is provided on the right side of the end seat, and a second limiting ring is provided on the outer side of the valve stem at a position corresponding to the tapered opening.

[0023] Preferably, the outer surface of the adjustable valve core is dynamically sealed to the through-hole valve cavity.

[0024] This invention provides an adjustable anti-puncture throttle valve. It possesses the following beneficial technical effects:

[0025] This application improves the structure of the valve core by setting a rotatable adjustable valve core and a fixed valve core. The adjustable valve core has a first arc-shaped slot, and the fixed valve core has a second arc-shaped slot. The overlapping area of ​​the first and second arc-shaped slots is the actual throttling channel of this throttling valve. This throttling channel is circular or arc-shaped, which has the advantage of being less prone to clogging compared to the traditional annular gap throttling channel. By rotating the adjustable valve core, the user can adjust the cross-sectional size of the throttling channel (actually adjusting the size of the central angle corresponding to the arc-shaped slot), and can make quick adjustments according to the requirements of the sea well blowout test.

[0026] This application, by setting a first connecting pipe and a second connecting pipe, and setting a first puncture-resistant alloy sleeve on the inner side of the first connecting pipe and a second puncture-resistant alloy sleeve on the inner side of the second connecting pipe, addresses the issue of formation return mud containing a large number of solid particles. After exiting through the right end of the through-hole valve chamber, these particles will impact and rub against the inner walls of the first and second puncture-resistant alloy sleeves (i.e., puncture). The first and second puncture-resistant alloy sleeves provide excellent puncture resistance. Furthermore, an adjustable distance structure is provided between the first and second connecting pipes. During use, the first connecting pipe and the second connecting pipe are adjusted... The two connecting pipes are connected into a whole and then connected between the fixed valve body and the main pipe. Since both the valve body and the main pipe are rigid structures, the first connecting pipe and the second connecting pipe on the inside are not easy to connect. The structure composed of the first connecting pipe, the adjusting structure and the second connecting pipe designed in this application can shorten the overall length before installation. After being placed between the valve body and the main pipe, the overall length can be adjusted to facilitate the installation and disassembly of the overall structure composed of the first connecting pipe, the adjusting structure and the second connecting pipe, thereby facilitating the replacement of the first puncture-resistant alloy sleeve and the second puncture-resistant alloy sleeve. Attached Figure Description

[0027] Figure 1 This is a perspective view of the adjustable anti-stab throttle valve proposed in this invention.

[0028] Figure 2 This is a cross-sectional view of the adjustable anti-stab throttle valve proposed in this invention.

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 4 This is an exploded view of the valve body of the adjustable anti-stab throttle valve proposed in this invention.

[0031] Figure 5 This is an exploded view of the adjustable anti-stab throttle valve structure proposed in this invention.

[0032] Figure 6 for Figure 5Enlarged view of section B in the middle.

[0033] The components are as follows: 1. Valve body; 2. First connecting pipe; 3. Second connecting pipe; 4. Main body; 5. First puncture-resistant alloy sleeve; 6. Second puncture-resistant alloy sleeve; 7. First limiting part; 8. Second limiting part; 9. Liquid inlet; 10. Through-hole valve cavity; 11. First limiting ring; 12. Adjustable valve core; 13. Fixed valve core; 14. First arc-shaped slot; 15. First hexagonal slot; 16. Second arc-shaped slot; 17. End seat; 18. Valve stem; 19. Sealing mounting port; 20. Sealing bearing; 21. Sealing compression cap; 22. Handwheel; 23. Sealing ring; 24. Hexagonal part. 25. Threaded part; 26. Second limiting ring; 27. Threaded hole; 28. Clamping screw; 29. ​​First flange; 30. Second flange; 31. Double-ended screw; 32. First clamping nut; 33. Second clamping nut; 34. First inner support nut; 35. Second inner support nut; 36. First gear part; 37. Second gear part; 38. First gear ring; 39. Second gear ring; 40. First bevel gear part; 41. Second bevel gear part; 42. Inner support ring; 43. Annular mounting groove; 44. Snap ring part; 45. Mounting shaft; 46. Bevel gear; 47. Second hexagonal slot. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0035] like Figure 1-6 As shown, the present invention provides an adjustable anti-stab throttle valve, including: valve body 1, end seat 17, valve stem 18, adjustable valve core 12, fixed valve core 13, first connecting pipe 2, second connecting pipe 3, and adjustment structure.

[0036] The valve body 1 is a cylinder with a through-hole valve cavity 10 along the axial direction. The side of the valve body 1 has an inlet 9 that communicates with the through-hole valve cavity 10. The mud flows into the throttle valve from the inlet 9 and then into the through-hole valve cavity 10. A first limiting ring 11 is fixedly connected to the inner wall of the through-hole valve cavity 10 and the right side of the junction between the through-hole valve cavity 10 and the inlet 9. The function of the first limiting ring 11 is to axially limit the installation position of the adjustable valve core 12.

[0037] The end seat 17 is fixedly connected to the left end of the valve body 1 by a bolt group. The outer side of the end seat 17 has a flange. The left end of the valve body 1 has a threaded hole and is installed using a flange bolt structure. The main body of the end seat 17 extends into the interior of the through-hole valve cavity 10. The inner side of the end seat 17 has a center hole for installing the valve stem 18.

[0038] The valve stem 18 passes through the center hole of the end seat 17 and is rotatably connected to the end seat 17. One end of the valve stem 18 is located on the left side of the end seat 17 and is fixedly connected to a handwheel 22. The other end of the valve stem 18 is located inside the through-hole valve cavity 10 and is provided with a hexagonal part 24. The valve stem 18 is rotated by controlling the handwheel 22, which in turn drives the adjustable valve core 12 to rotate.

[0039] Both the adjustable valve core 12 and the fixed valve core 13 are located inside the through-hole valve cavity 10, and both are located to the right of the first limiting ring 11. The adjustable valve core 12 is close to the first limiting ring 11, which restricts the leftmost end of the adjustable valve core 12. Both the adjustable valve core 12 and the fixed valve core 13 are located to the right of the liquid inlet 9, meaning that the liquid entering the through-hole valve cavity 10 will first contact the adjustable valve core 12. The end face of the adjustable valve core 12 is... The valve body 1 has a first arc-shaped slot 14, and a second arc-shaped slot 16 is provided on the end face of the fixed valve core 13. The adjustable valve core 12 has a first hexagonal slot 15 on one end face near the hexagonal part 24. One end of the hexagonal part 24 is inserted into the interior of the first hexagonal slot 15. A threaded hole 27 is provided on the side of the valve body 1 at the position corresponding to the fixed valve core 13. A clamping screw 28 is threaded inside the threaded hole 27. One end of the clamping screw 28 is pressed against the side of the fixed valve core 13.

[0040] The principle of this throttle valve is that the overlapping area of ​​the first arc-shaped slot 14 and the second arc-shaped slot 16 is the actual throttle channel of the throttle valve. By rotating the adjustable valve core 12, the cross-sectional area of ​​the overlapping area can be changed.

[0041] In actual use, the user operates the handwheel 22 to drive the valve stem 18 to rotate, and the hexagonal part 24 rotates together with the valve stem 18 to drive the adjustable valve core 12 to rotate, thereby realizing the adjustment of the throttle valve.

[0042] The first connecting pipe 2 and the second connecting pipe 3 are coaxially arranged and fixedly connected by an adjusting structure. This adjusting structure allows adjustment of the gap between the first connecting pipe 2 and the second connecting pipe 3, thereby adjusting the overall length of the structure consisting of the first connecting pipe, the adjusting structure, and the second connecting pipe to accommodate direct installation of rigid pipes. A first puncture-resistant alloy sleeve 5 is provided on the inner side of the first connecting pipe 2. A first limiting part 7 is fixedly connected to the outer side of the first puncture-resistant alloy sleeve 5 at the end of the first connecting pipe 2 furthest from the second connecting pipe 3. When the first connecting pipe 2 moves outward, it pushes the first limiting part 7, causing the first puncture-resistant alloy sleeve 5 to move accordingly. A second puncture-resistant alloy sleeve 6 is provided on the inner side of the second connecting pipe 3. A second limiting part 8 is fixedly connected to the outer side of the second puncture-resistant alloy sleeve 6 at the end of the second connecting pipe 3 furthest from the first connecting pipe 2. When the second connecting pipe 3 moves outward, it directly pushes the second limiting part 8, causing the second puncture-resistant alloy sleeve 6 to move accordingly. 6 moves along with the second connecting pipe 3. One end of the first puncture-resistant alloy sleeve 5 is inserted into the interior of the second puncture-resistant alloy sleeve 6, and the second puncture-resistant alloy sleeve 6 and the first puncture-resistant alloy sleeve 5 are slidably connected. The inner sides of the second puncture-resistant alloy sleeve 6 and the first puncture-resistant alloy sleeve 5 are puncture-resistant surfaces. During the sliding adjustment process, the puncture-resistant surfaces are always in an intact state. The outer seam of the second puncture-resistant alloy sleeve 6 and the first puncture-resistant alloy sleeve 5 is located inside the first connecting pipe 2. The end of the first connecting pipe 2 away from the second connecting pipe 3 is fixedly connected to the right end of the valve body 1 by a bolt group, and the central hole of the first connecting pipe 2 is connected to the right end of the through-hole valve cavity 10.

[0043] Liquid flowing through the throttling channel flows from the right end of the through-hole valve chamber 10 into the inner side of the first puncture-resistant alloy sleeve 5 and the second puncture-resistant alloy sleeve 6. The first puncture-resistant alloy sleeve 5 and the second puncture-resistant alloy sleeve 6, relying on their own material properties (the material can be hard alloy tungsten carbide), can effectively resist punctures. Moreover, the overall structure composed of the first connecting pipe, the adjusting structure, and the second connecting pipe is easy to disassemble and install, so that the first puncture-resistant alloy sleeve 5 and the second puncture-resistant alloy sleeve 6 can also be removed, replaced, and then reinstalled. This can greatly improve the service life of the pipeline system and shorten the maintenance time of the pipeline system.

[0044] During the disassembly and installation of the integrated structure consisting of the first connecting pipe, the adjusting structure, and the second connecting pipe, the distance between the valve body 1 and the main pipe 4 (the main pipe 4 is the pipeline system for the liquid outlet, which is generally in a rigid fixed state) is fixed. It is very difficult to disassemble or install the integrated structure consisting of the first connecting pipe, the adjusting structure, and the second connecting pipe separately. Moreover, it is difficult to complete the installation of the sealing structure between the pipe connection surfaces. In particular, this scheme requires that the first puncture-resistant alloy sleeve 5 partially extend into the interior of the through-hole valve cavity 10 to protect the joint between the through-hole valve cavity 10 and the first connecting pipe 2.

[0045] Reference Appendix Figure 4 In one embodiment, a sealing mounting port 19 is provided at the left end of the end seat 17, and a sealing bearing 20 is provided on the inner side of the sealing mounting port 19. A sealing extrusion cap 21 is threaded to the left end of the sealing mounting port 19. The sealing extrusion cap 21 has a central hole. After the sealing extrusion cap 21 is installed, the sealing bearing 20 is extruded. The valve stem 18 is fixedly connected to the inner wall of the sealing bearing 20. The valve stem 18 passes through the central hole of the sealing extrusion cap 21. A sealing ring 23 is provided between the end seat 17 and the valve body 1.

[0046] The sealing mounting port 19, sealing bearing 20, and sealing extrusion cap 21 are designed to ensure the sealing between the valve stem 18 and the end seat 17. The sealing ring 23 is designed to ensure the sealing between the end seat 17 and the valve body 1.

[0047] Reference Appendix Figure 4 In one embodiment, the left end of the valve stem 18 is provided with a threaded portion 25, and the handwheel 22 is threadedly connected to the threaded portion 25.

[0048] During the installation of valve stem 18, the left end of valve stem 18 needs to be inserted from the right end of the center hole of end seat 17 toward the left end. Therefore, valve stem 18 and handwheel 22 must be detachable to facilitate the assembly of this device.

[0049] In actual manufacturing of valve stem 18, threaded portion 25, hexagonal portion 24, and threaded portion 25 are all integral structures.

[0050] Reference Appendix Figures 4-6 In one embodiment, the adjustable distance structure includes: a first flange 29 at the right end of the first connecting pipe 2, a second flange 30 at the left end of the second connecting pipe 3, a double-ended screw 31, a first clamping nut 32, a second clamping nut 33, a first inner support nut 34, a second inner support nut 35, an inner support ring 42, a first gear ring 38, a second gear ring 39, and a bevel gear 46.

[0051] The first flange 29 has a first through hole at its end, and the second flange 30 has a second through hole at its end. The first flange 29 and the second flange 30 are distributed in parallel and at intervals. There are several first through holes and second through holes, which are arranged in a ring array. Therefore, the double-ended screw 31, the first inner support nut 34, and the second inner support nut 35 are all provided in the same number of first through holes and second through holes.

[0052] The double-ended screw 31 is located between the first flange 29 and the second flange 30. One end of the double-ended screw 31 passes through the first through hole and is threaded to the first clamping nut 32. The other end of the double-ended screw 31 passes through the second through hole and is threaded to the second clamping nut 33. The first flange 29 and the second flange 30 are clamped and fixed inward by the first clamping nut 32 and the second clamping nut 33 at both ends.

[0053] Both the first inner support nut 34 and the second inner support nut 35 are threadedly connected to the double-ended screw 31 located between the first flange 29 and the second flange 30. The first inner support nut 34 is fixedly connected to the end facing the second inner support nut 35 with a first gear part 36, and the second inner support nut 35 is fixedly connected to the end facing the first inner support nut 34 with a second gear part 37.

[0054] The first inner support nut 34 and the second inner support nut 35 support the first flange 29 and the second flange 30, and apply pressure to the first flange 29 and the second flange 30 outward. Together with the first clamping nut 32 and the second clamping nut 33, they can stably fix the positions of the first flange 29 and the second flange 30.

[0055] The inner support ring 42 is sleeved on the outside of the second puncture-resistant alloy sleeve 6. The inner support ring 42 applies an inward force to the second puncture-resistant alloy sleeve 6, which can ensure that the second puncture-resistant alloy sleeve 6 at this location is not easily deformed. Two annular mounting grooves 43 are opened on the outer side of the inner support ring 42. A mounting shaft 45 is fixedly connected to the outer side of the inner support ring 42 and located between the two annular mounting grooves 43. A bevel gear 46 is rotatably connected to the end of the mounting shaft 45.

[0056] Both the inner sides of the first gear ring 38 and the second gear ring 39 are fixedly connected with retaining rings. The retaining rings 44 of the first gear ring 38 and the retaining rings 43 of the second gear ring 39 are rotatably connected to two annular mounting grooves. The two annular mounting grooves 43 restrict the axial sliding of the first gear ring 38 and the second gear ring 39, allowing them to only rotate. The side of the first gear ring 38 closest to the second gear ring 39 is fixedly connected with a first bevel tooth 40, and the side of the second gear ring 39 closest to the first gear ring 38 is fixedly connected with a second bevel tooth 41. The bevel gear 46 is located between the first bevel tooth 40 and the second bevel tooth 41, and meshes with both the first bevel tooth 40 and the second bevel tooth 41. The first gear ring 38 meshes with the first gear part 36, and the second gear ring 39 meshes with the second gear part 37.

[0057] In use, the user needs to first loosen the first clamping nut 32 and the second clamping nut, and then turn the bevel gear 46 with a wrench to drive the first bevel gear 40 and the second bevel gear 41 to rotate in opposite directions. That is, the first gear ring 38 and the second gear ring 39 rotate in opposite directions. The first gear ring 38 drives the first gear part 36, and the second gear ring 39 drives the second gear part 37, so that the first inner support nut 34 and the second inner support nut 35 move in opposite directions synchronously, so that the first inner support nut 34 and the second inner support nut 35 move closer to each other or further away from each other, thereby adjusting the distance between the first flange 29 and the second flange 30. After the adjustment is completed, the first clamping nut 32 and the second clamping nut need to be tightened.

[0058] Reference Appendix Figure 6 In one embodiment, the bevel gear 46 has a mounting hole at one end near the mounting shaft 45, and a second hexagonal slot 47 at the other end away from the mounting shaft 45, so as to use a hexagonal wrench to rotate the bevel gear 46 to adjust the pitch structure.

[0059] Both the inner surfaces of the second puncture-resistant alloy sleeve 6 and the first puncture-resistant alloy sleeve 5 are smooth surfaces, which facilitate the flow of liquid.

[0060] Both ends of the first connecting pipe 2 and both ends of the second connecting pipe 3 are provided with connecting flanges. The first connecting pipe 2 is also connected to the valve body 1 by a flange, and the second connecting pipe 3 is also connected to the main pipe body (4) by a flange.

[0061] The central angles corresponding to the first arc-shaped slot 14 and the second arc-shaped slot 16 are both less than 180°, which can achieve a state in which the first arc-shaped slot 14 and the second arc-shaped slot 16 are completely staggered.

[0062] A tapered opening is provided on the right side of the end seat 17, and a second limiting ring 26 is provided on the outer side of the valve stem 18 at a position corresponding to the tapered opening. The second limiting ring 26 is used to restrict the axial sliding of the valve stem 18 and the end seat 17 (restricting sliding towards the left).

[0063] The outer surface of the adjustable valve core 12 is dynamically sealed to the through-hole valve cavity 10, preventing liquid from flowing out through the gap between the outer surface of the adjustable valve core 12 and the inner surface of the through-hole valve cavity 10, while ensuring that the adjustable valve core 12 itself is rotatable. In this dynamic sealing structure, the outer annular side of the adjustable valve core 12 and the inner annular side of the through-hole valve cavity 10 are precisely fitted together to form a seal. Furthermore, the right end of the first limiting ring 11 is also precisely fitted to the left end of the adjustable valve core 12, thus forming a sealing structure between the adjustable valve core 12 and the through-hole valve cavity 10.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable anti-stab throttle valve, characterized in that, include: The valve body (1) has a through-hole valve cavity (10) along the axial direction. The valve body (1) has an inlet (9) on its side that communicates with the through-hole valve cavity (10). A first limiting ring (11) is fixedly connected to the inner wall of the through-hole valve cavity (10) and the right side of the junction between the through-hole valve cavity (10) and the inlet (9). End seat (17), the end seat (17) is fixedly connected to the left end of the valve body (1) by a bolt group, and the main body of the end seat (17) extends into the interior of the through-hole valve cavity (10), and the inner side of the end seat (17) has a central hole; The valve stem (18) passes through the center hole of the end seat (17) and is rotatably connected to the end seat (17). One end of the valve stem (18) is located on the left side of the end seat (17) and is fixedly connected to a handwheel (22). The other end of the valve stem (18) is located inside the through-hole valve cavity (10) and is provided with a hexagonal part (24). An adjustable valve core (12) and a fixed valve core (13) are both located inside a through-hole valve cavity (10), and both are located on the right side of the first limiting ring (11), with the adjustable valve core (12) closer to the first limiting ring (11). The end face of the adjustable valve core (12) is provided with a first arc-shaped slot (14), and the end face of the fixed valve core (13) is provided with a second arc-shaped slot (15). 6) The adjustable valve core (12) has a first hexagonal slot (15) on one end face near the hexagonal part (24). One end of the hexagonal part (24) is inserted into the first hexagonal slot (15). A threaded hole (27) is provided on the side of the valve body (1) at the position corresponding to the fixed valve core (13). A clamping screw (28) is threaded inside the threaded hole (27). One end of the clamping screw (28) is pressed against the side of the fixed valve core (13). A first connecting pipe (2) and a second connecting pipe (3) are coaxially arranged and fixedly connected by an adjustable gap structure. A first puncture-resistant alloy sleeve (5) is provided on the inner side of the first connecting pipe (2), and a first limiting part (7) is fixedly connected on the outer side of the first puncture-resistant alloy sleeve (5) at the end of the first connecting pipe (2) away from the second connecting pipe (3). A second puncture-resistant alloy sleeve (6) is provided on the inner side of the second connecting pipe (3), and a first limiting part (7) is fixedly connected on the outer side of the second puncture-resistant alloy sleeve (6) at the end of the second connecting pipe (3) away from the second connecting pipe (3). The end of the connecting pipe (3) away from the first connecting pipe (2) is fixedly connected to the second limiting part (8). One end of the first puncture-resistant alloy sleeve (5) is inserted into the interior of the second puncture-resistant alloy sleeve (6), and the second puncture-resistant alloy sleeve (6) is slidably connected to the first puncture-resistant alloy sleeve (5). The outer seam of the second puncture-resistant alloy sleeve (6) and the first puncture-resistant alloy sleeve (5) is located inside the first connecting pipe (2). The end of the first connecting pipe (2) away from the second connecting pipe (3) is fixedly connected to the right end of the valve body (1) by a bolt group. The central hole of the first connecting pipe (2) is connected to the right end of the through-hole valve cavity (10). The adjustment structure includes: The first flange (29) at the right end of the first connecting pipe (2) and the second flange (30) at the left end of the second connecting pipe (3) are provided with a first through hole at the end of the first flange (29) and a second through hole at the end of the second flange (30). The first flange (29) and the second flange (30) are distributed parallel to each other. A double-ended screw (31) is located between the first flange (29) and the second flange (30). One end of the double-ended screw (31) passes through the first through hole and is threaded to a first clamping nut (32). The other end of the double-ended screw (31) passes through the second through hole and is threaded to a second clamping nut (33). The first inner support nut (34) and the second inner support nut (35) are threadedly connected to the double-ended screw (31) between the first flange (29) and the second flange (30). The first inner support nut (34) is fixedly connected to the end of the second inner support nut (35) with a first gear part (36), and the second inner support nut (35) is fixedly connected to the end of the first inner support nut (34) with a second gear part (37). An inner support ring (42) is sleeved on the outside of the second puncture-resistant alloy sleeve (6). Two annular mounting grooves (43) are opened on the outer side of the inner support ring (42). An mounting shaft (45) is fixedly connected to the outer side of the inner support ring (42) between the two annular mounting grooves (43). A bevel gear (46) is rotatably connected to the end of the mounting shaft (45). The first gear ring (38) and the second gear ring (39) are fixedly connected to the inner side of the first gear ring (38) and the second gear ring (39). The retaining ring (44) of the first gear ring (38) and the retaining ring of the second gear ring (39) are respectively rotatably connected to two annular mounting grooves. The first gear ring (38) is fixedly connected to the side of the second gear ring (39) near the first gear ring (39). The second gear ring (39) is fixedly connected to the side of the first gear ring (38) near the first gear ring (38). The bevel gear (46) is located between the first bevel gear (40) and the second bevel gear (41) and meshes with both the first bevel gear (40) and the second bevel gear (41). The first gear ring (38) meshes with the first gear part (36), and the second gear ring (39) meshes with the second gear part (37).

2. The adjustable anti-stab throttle valve according to claim 1, characterized in that: The left end of the end seat (17) is provided with a sealing installation port (19), and a sealing bearing (20) is provided on the inner side of the sealing installation port (19). A sealing extrusion cap (21) is threaded to the left end of the sealing installation port (19). The sealing extrusion cap (21) has a central hole. The valve stem (18) is fixedly connected to the inner wall of the sealing bearing (20). The valve stem (18) passes through the central hole of the sealing extrusion cap (21). A sealing ring (23) is provided between the end seat (17) and the valve body (1) connection surface.

3. The adjustable anti-stab throttle valve according to claim 1, characterized in that: The valve stem (18) has a threaded part (25) at its left end, and the handwheel (22) is threadedly connected to the threaded part (25).

4. The adjustable anti-stab throttle valve according to claim 1, characterized in that: The bevel gear (46) has a mounting hole at one end near the mounting shaft (45), and a second hexagonal slot (47) at the other end away from the mounting shaft (45).

5. The adjustable anti-stab throttle valve according to claim 1, characterized in that: The inner surfaces of the second puncture-resistant alloy sleeve (6) and the first puncture-resistant alloy sleeve (5) are both smooth surfaces.

6. The adjustable anti-stab throttle valve according to claim 1, characterized in that: Both ends of the first connecting pipe (2) and both ends of the second connecting pipe (3) are provided with connecting flanges.

7. The adjustable anti-stab throttle valve according to claim 1, characterized in that: The central angles corresponding to the first arc-shaped slot (14) and the second arc-shaped slot (16) are both less than 180°.

8. The adjustable anti-stab throttle valve according to claim 1, characterized in that: A conical opening is provided on the right side of the end seat (17), and a second limiting ring (26) is provided on the outer side of the valve stem (18) at a position corresponding to the conical opening.

9. The adjustable anti-stab throttle valve according to claim 1, characterized in that: The outer side of the adjustable valve core (12) is dynamically sealed to the through-hole valve cavity (10).

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