A fracturing wellhead device convenient to disassemble

Abstract

The present application relates to the technical fields of fracturing wellhead device, and discloses a fracturing wellhead device convenient to disassemble, which comprises a wellhead assembly and a fracturing head assembly, a plurality of manual gate valves are arranged in the wellhead assembly and the fracturing head assembly, and the wellhead assembly and the fracturing head assembly are communicated through a manual gate valve, the bottom end of the upper valve rod is provided with a double-tapered-face self-locking ring groove structure which is narrow in the middle and wide at both ends, the special structure of the double-tapered-face self-locking ring groove structure which is narrow in the middle and wide at both ends of the bottom end of the upper valve rod reserves sufficient operation space for taking out old packing and filling new packing, avoids the problems of the traditional structure that the valve rod penetrates the packing area and the operation space is narrow, meanwhile, the packing debris falling during the removal of the old packing can be received, so that the packing debris is prevented from falling into the inner cavity and the internal part of the manual gate valve to cause the pollution of the valve body and the jamming failure, and during the filling of the new packing, the packing can be intercepted and limited by the conical surface structure to prevent the packing from scattering and falling off.

Description

Technical Field

[0001] This invention relates to the field of fracturing wellhead equipment technology, and more specifically to a fracturing wellhead equipment that is easy to assemble and disassemble. Background Technology

[0002] Generally speaking, a fracturing wellhead device is a piece of equipment used for fracturing operations in shale gas and oil and gas fields. During the fracturing operation, the valve stem assembly needs to rotate the handwheel to drive the valve plate to open and close, so as to control the flow of high-pressure fluid. At the same time, a packing seal needs to be installed between the valve stem and the valve body to prevent high-pressure sand-containing media from leaking outward along the valve stem.

[0003] In practice, replacing the packing often presents a thorny problem: the lower end of the valve stem is fixedly connected to the valve plate, the upper end is fixedly connected to the handwheel, and the middle section of the valve stem passes through the stuffing box. The packing is wrapped in the annular gap between the outer wall of the valve stem and the inner wall of the stuffing box. When the packing needs to be replaced, the operator must first remove the handwheel, then remove the packing gland, and then use a special hook to pry out the old packing bit by bit in the narrow annular gap. Since the valve stem always passes through the stuffing box, the operating space is extremely limited, and the pried-out packing debris is easy to fall into the valve body and cause contamination. When new packing is then filled, the packing is difficult to compact evenly due to the obstruction of the valve stem, and the overlap angle between adjacent packing rings is not easy to align, resulting in a decrease in sealing effect. In addition, when fracturing operations are carried out frequently, the friction and wear between the valve stem and the packing increases, and the frequency of packing replacement increases accordingly, which seriously affects the construction efficiency. Based on this, the present invention purposefully provides a valve stem assembly for fracturing wellhead devices that is easy to disassemble and assemble, which allows the valve stem to move away from the packing area when replacing the packing, eliminates the limitation of the operating space for packing replacement, and improves the efficiency of packing replacement. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a fracturing wellhead device that is easy to assemble and disassemble, thereby solving the technical problems in the prior art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A fracturing wellhead device that is easy to assemble and disassemble includes a wellhead assembly and a fracturing head assembly. Both the wellhead assembly and the fracturing head assembly include multiple manual gate valves, and the wellhead assembly and the fracturing head assembly are connected through a manual gate valve. Each manual gate valve is provided with a gate plate, and each manual gate valve is connected to a connecting pipe. A lower valve stem is slidably installed in the connecting pipe, and the lower valve stem is fixedly connected to the gate plate.

[0007] A connecting pipe is fixedly installed at the top of the connecting pipe by multiple bolts. A fixing plate is fixedly installed at the top of the connecting pipe. There is a gap between the connecting pipe and the fixing plate. An upper valve stem is slidably installed inside the fixing plate. The upper valve stem is driven by a drive assembly to move up and down. A double-conical self-locking ring groove is opened at the bottom end of the upper valve stem. The radius of the double-conical self-locking ring groove decreases and increases upward along the central axis of the upper valve stem, forming a structure that is narrow in the middle and wide at both ends. An inner cavity is opened inside the connecting pipe. A linkage block is slidably installed in the inner cavity. A locking groove is opened in the linkage block. A self-locking assembly is set in the locking groove. When the bottom end of the upper valve stem is inserted into the locking groove, the self-locking assembly and the double-conical self-locking ring groove cooperate to lock the upper valve stem. At this time, a temporary rigid connection is established between the upper valve stem and the linkage block. A stuffing box is filled inside the connecting pipe. The stuffing box is arranged around the outer circle of the upper valve stem. A valve cover is set above the stuffing box. The valve cover is fixedly connected to the top end of the connecting pipe by multiple bolts.

[0008] As a further embodiment of the present invention: the driving assembly includes a rotating ring and a handwheel, the rotating ring is rotatably mounted on the top of the fixed disk, the handwheel is fixedly connected to the outer circular surface of the rotating ring, and the inner wall of the rotating ring is threadedly connected to the outer circular surface of the upper valve stem.

[0009] As a further aspect of the present invention: two symmetrically arranged brackets are fixedly installed at the bottom of the fixed plate, and the bottom of the brackets is fixedly connected to the top of the connecting pipe by bolts.

[0010] As a further aspect of the present invention: two symmetrically arranged fixing rods are fixedly installed at the bottom of the fixing plate, and a rotating plate is rotatably installed at the bottom of each fixing rod. The rotating plate is driven to rotate by a drive source. When the valve cover rises to abut the bottom of the fixing plate, the drive source drives the rotating plate to rotate, so that one end of the rotating plate abuts the bottom of the valve cover to achieve a limit position.

[0011] As a further embodiment of the present invention: the self-locking assembly includes a wedge block, an inclined surface, a sliding rod, and a spring. The two wedge blocks are symmetrically arranged and slidably installed in the locking groove. An inclined surface is provided on the opposite side of each of the two wedge blocks. The combined cross section of the two inclined surfaces is hourglass-shaped and matches the double-cone self-locking ring groove. The sliding rod is slidably installed in the locking groove. One end of the sliding rod is fixedly connected to the end of the wedge block away from the inclined surface. One end of the spring is fixedly installed in the locking groove, and the other end of the spring is fixedly connected to the end of the wedge block away from the inclined surface. The preload of the spring causes the wedge block to move toward the upper valve stem.

[0012] As a further embodiment of the present invention: the self-locking assembly further includes an extension plate, a slider, and an unlocking assembly. The two extension plates are symmetrically arranged, and the extension plates are slidably installed in the linkage block. The extension plates are fixedly connected to the end of the slide rod away from the wedge block. A groove is provided at the top of the connecting pipe, and the slider is slidably installed in the groove. The slider is driven to move by the unlocking assembly. When the driving assembly drives the upper valve rod to descend, it simultaneously drives the linkage block, the lower valve rod, and the gate to descend, so that when the manual gate valve is closed, the bottom end of the extension plate slides into the slider. When the unlocking assembly drives the slider to move, it simultaneously drives the extension plate, the slide rod, and the wedge block to move, so that the wedge block moves away from the upper valve rod.

[0013] As a further embodiment of the present invention: the unlocking component includes a threaded rod and a nut, the threaded rod is slidably installed inside the connecting pipe, one end of the threaded rod is fixedly connected to the slider, the nut is rotatably installed on the outer circular surface of the connecting pipe, the inner wall of the nut is threadedly connected to the outer circular surface of the threaded rod, and the nut is driven to rotate by an output source.

[0014] As a further aspect of the present invention: a sleeve is slidably fitted onto the outer circular surface of the connecting pipe, the height of the sleeve is not less than the interval between the connecting pipe and the fixed plate, and the top end of the sleeve is fixedly connected to the bottom end of the fixed plate by multiple bolts.

[0015] The beneficial effects of this invention are:

[0016] 1. In this invention, a double-conical self-locking ring groove structure with a narrow middle and wide ends is provided at the bottom of the upper valve stem. With the special structure of the double-conical self-locking ring groove at the bottom of the upper valve stem, which is narrow in the middle and wide at both ends, sufficient operating space is reserved for the removal of old packing and the filling of new packing. This avoids the problem of the valve stem penetrating the packing area and the narrow operating space in the traditional structure. At the same time, during the removal of old packing, it can catch the falling packing debris, preventing the debris from falling into the inner cavity and the inside of the manual gate valve, causing valve body contamination and jamming. During the filling of new packing, the conical structure can be used to intercept and limit the packing, preventing the packing from scattering and falling off.

[0017] 2. In this invention, a temporary rigid connection between the upper valve stem and the linkage block is achieved by setting a double-conical self-locking ring groove at the bottom of the upper valve stem in conjunction with a self-locking component. During operation, the lower valve stem and the gate can be driven to rise and fall stably in sync to achieve fluid flow control. When the packing is replaced, the rigid connection can be quickly released by the unlocking component, allowing the upper valve stem to rise independently to avoid the central area of ​​the stuffing box. There is no need to disassemble the upper drive structure as a whole, which greatly simplifies the packing disassembly and assembly process and effectively improves the efficiency of packing replacement.

[0018] 3. In this invention, a bracket is used to form an interval support structure to stably maintain the reserved operating distance between the connecting pipe and the fixed plate. Combined with a sliding sleeve and a rotatable plate, a multi-functional auxiliary assembly structure is formed. During normal fracturing operations, the sleeve can fully cover the internal valve stem and self-locking precision components, preventing the intrusion of external dust and impurities and avoiding component corrosion, jamming, wear and failure. When the packing is disassembled and maintained, the sleeve can slide down to expose the operating area, and the rotating plate can provide limiting support for the raised valve cover. There is no need for manual holding of the valve cover, which effectively frees up operating space and simplifies the disassembly and assembly process. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the connecting pipe in this invention;

[0022] Figure 3 This is a cross-sectional structural schematic diagram of the connecting pipe in this invention;

[0023] Figure 4 This is a cross-sectional structural schematic diagram of the linkage block in this invention;

[0024] Figure 5 This is a schematic diagram of the sleeve descent structure in this invention;

[0025] Figure 6 This is a schematic diagram of the rotating plate locking valve cover in this invention;

[0026] Figure 7 This is a schematic diagram of the structure of the upper valve stem rising in this invention;

[0027] Figure 8 This is a schematic diagram of the fit between the double-conical self-locking ring groove and the stuffing box in this invention.

[0028] In the diagram: 1. Wellhead assembly; 2. Fracturing head assembly; 3. Manual gate valve; 4. Connecting pipe; 401. Groove; 5. Connecting pipe; 501. Inner cavity; 6. Fixed plate; 601. Support; 7. Rotating ring; 8. Handwheel; 9. Sleeve; 10. Valve cover; 11. Stuffing box; 12. Upper valve stem; 13. Linkage block; 1301. Locking groove; 14. Lower valve stem; 15. Double conical self-locking ring groove; 16. Fixed rod; 17. Rotating plate; 18. Wedge block; 19. Inclined surface; 20. Sliding rod; 21. Spring; 22. Extension plate; 23. Sliding block; 24. Threaded rod; 25. Nut. Detailed Implementation

[0029] 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.

[0030] Please see Figures 1-8 As shown, the present invention is a fracturing wellhead device that is easy to assemble and disassemble, including a wellhead assembly 1 and a fracturing head assembly 2. Both the wellhead assembly 1 and the fracturing head assembly 2 include multiple manual gate valves 3, and the wellhead assembly 1 and the fracturing head assembly 2 are connected through a manual gate valve 3. Each manual gate valve 3 is provided with a gate plate, and each manual gate valve 3 is connected to a connecting pipe 4. A lower valve stem 14 is slidably installed in the connecting pipe 4, and the lower valve stem 14 is fixedly connected to the gate plate.

[0031] A connecting pipe 5 is fixedly installed at the top of the connecting pipe 4 by multiple bolts. A fixing plate 6 is fixedly installed at the top of the connecting pipe 5. There is a gap between the connecting pipe 5 and the fixing plate 6. An upper valve stem 12 is slidably installed inside the fixing plate 6. The upper valve stem 12 is driven by a drive assembly to move up and down. A double-conical self-locking ring groove 15 is formed at the bottom end of the upper valve stem 12. The radius of the double-conical self-locking ring groove 15 decreases and then increases upward along the central axis of the upper valve stem 12, forming a structure that is narrow in the middle and wide at both ends. An inner cavity 501 is formed inside the connecting pipe 5. A linkage block 13 is slidably installed inside the 01. A locking groove 1301 is provided in the linkage block 13. A self-locking component is provided in the locking groove 1301. When the bottom end of the upper valve stem 12 is inserted into the locking groove 1301, the self-locking component cooperates with the double conical self-locking ring groove 15 to lock the upper valve stem 12. At this time, the upper valve stem 12 and the linkage block 13 establish a temporary rigid connection. The connecting pipe 5 is filled with a stuffing box 11. The stuffing box 11 is arranged around the outer circle of the upper valve stem 12. A valve cover 10 is provided above the stuffing box 11. The valve cover 10 is fixedly connected to the top end of the connecting pipe 5 by multiple bolts.

[0032] The connecting pipe 4, the connecting pipe 5, and the fixing plate 6 are all housed and assembled inside the protective sleeve, which uses the protective structure of the protective sleeve to isolate and protect the core pipes and fixing components.

[0033] The working principle of this invention is as follows: During normal fracturing operations, the linkage block 13 and the lower valve stem 14 remain fixed. The lower valve stem 14 is fixedly connected to the gate plate inside the manual gate valve 3. The operator controls the upper valve stem 12 to descend vertically, so that the bottom end of the upper valve stem 12 is inserted into the locking groove 1301 of the linkage block 13 in the inner cavity 501 of the connecting pipe 5. Through the locking structure of the self-locking component and the double-cone self-locking ring groove 15, the upper valve stem 12 and the linkage block 13 form a temporary rigid connection. At this time, the drive component can drive the upper valve stem 12 to move vertically up and down, synchronously driving the linkage block 13, the lower valve stem 14 and the gate plate to move up and down as a whole. The opening and closing displacement of the gate plate realizes the on / off and flow regulation of the high-pressure fluid inside the manual gate valve 3, meeting the requirements of fracturing operations.

[0034] When the equipment needs to replace the packing inside the stuffing box 11, firstly, the rigid locking state between the upper valve stem 12 and the linkage block 13 is released through the self-locking assembly, realizing the structural separation of the upper valve stem 12 and the linkage block 13. Then, the fixing bolts of the valve cover 10 at the top of the connecting pipe 5 are removed, the valve cover 10 is taken off, and then the upper valve stem 12 is driven vertically upward through the drive assembly, so that the bottom end of the upper valve stem 12 is flush with the bottom end of the stuffing box 11, allowing the upper valve stem 12 to completely avoid the central operating area of ​​the stuffing box 11. With the help of the special structure of the double conical self-locking ring groove 15 at the bottom end of the upper valve stem 12, which is narrow in the middle and wide at both ends, it provides... Sufficient operating space is reserved for the removal of old packing and the filling of new packing, avoiding the problems of valve stems penetrating the packing area and narrow operating space in traditional structures. At the same time, packing debris that falls off during disassembly can fall onto the conical surface of the double-conical self-locking ring groove 15, effectively preventing debris from falling into the inner cavity 501 below the connecting pipe 5 and the inside of the manual gate valve 3, thus avoiding valve body contamination. During the filling of new packing, the bottom conical surface of the double-conical self-locking ring groove 15 can act as an interception and limiter to prevent the new packing from scattering and falling, ensuring that the packing is filled evenly and compacted in place, greatly improving the efficiency of packing replacement and the quality of sealing assembly.

[0035] like Figures 1-2 As shown, in a preferred embodiment of the present invention, the drive assembly includes a rotating ring 7 and a handwheel 8. The rotating ring 7 is rotatably mounted on the top of the fixed disk 6, the handwheel 8 is fixedly connected to the outer circular surface of the rotating ring 7, and the inner wall of the rotating ring 7 is threadedly connected to the outer circular surface of the upper valve stem 12.

[0036] In one embodiment, the handwheel 8 is manually driven to rotate.

[0037] In practical application, the handwheel 8 is manually driven to rotate. During the actual application, the operator rotates the handwheel 8 to drive the rotating ring 7 to rotate synchronously in the circumferential direction. Relying on the threaded meshing transmission structure, the upper valve stem 12 is driven to complete the vertical lifting and lowering displacement. When the upper valve stem 12 is rigidly connected with the self-locking component and the linkage block 13 through the bottom double conical self-locking ring groove 15, the linkage block 13 can only slide vertically and cannot rotate in the circumferential direction. This can effectively limit the rotation tendency of the upper valve stem 12 and ensure that the upper valve stem 12 only performs precise vertical lifting and lowering movements, stably driving the gate to open and close. When the packing replacement operation requires separation of the structure, the upper valve stem 12 is completely disengaged from the linkage block 13 after the self-locking component is unlocked. The operator can manually limit the rotation of the upper valve stem 12. At this time, rotating the handwheel 8 and driving the rotating ring 7 to rotate can still drive the upper valve stem 12 to lift and lower independently, adapting to the displacement adjustment requirements of packing disassembly and assembly.

[0038] like Figures 1-5 As shown, in a preferred embodiment of the present invention, two symmetrically arranged brackets 601 are fixedly installed at the bottom of the fixed plate 6, and the bottom of the brackets 601 is fixedly connected to the top of the connecting pipe 5 by bolts.

[0039] In practical applications, the symmetrically arranged brackets 601 serve as load-bearing connectors, which can stably mount the fixed plate 6 on the top of the connecting pipe 5, precisely maintaining the reserved gap between the connecting pipe 5 and the fixed plate 6. This provides ample lateral operating space for packing disassembly and internal component maintenance, structurally avoiding the drawback of limited operating space in traditional integrated structures. At the same time, the brackets 601 adopt a bolt-detachable connection method, which allows the fixed plate 6 to be directly disassembled from the top of the connecting pipe 5 as a whole according to operational needs, further expanding the operating range for equipment disassembly and packing maintenance.

[0040] like Figures 1-6 As shown, in a preferred embodiment of the present invention, two symmetrically arranged fixing rods 16 are fixedly installed at the bottom of the fixing plate 6. A rotating plate 17 is rotatably installed at the bottom of each fixing rod 16. The rotating plate 17 is driven to rotate by a drive source. When the valve cover 10 rises to abut the bottom of the fixing plate 6, the drive source drives the rotating plate 17 to rotate, so that one end of the rotating plate 17 abuts the bottom of the valve cover 10 to achieve a limit position.

[0041] In one embodiment, the driving source can be manually driven or other mechanisms capable of rotational motion. This embodiment does not impose any specific limitations on these mechanisms.

[0042] In practical application, during the actual packing replacement operation, after the operator removes the fixing bolts of the valve cover 10, the valve cover 10 can be slid vertically upward along the outer wall of the upper valve stem 12 until the top of the valve cover 10 abuts against the bottom end face of the fixing plate 6. Then, the drive source drives the rotating plates 17 on both sides to rotate, so that one end of the rotating plate 17 presses against the bottom end of the valve cover 10, thereby temporarily limiting and fixing the valve cover 10. This structure can effectively prevent the valve cover 10 from falling off the ground and obstructing the operating area. There is no need for manual holding to fix the valve cover 10, which completely frees up the operating space and allows the operator to focus on removing the old packing and compacting and assembling the new packing. This greatly improves the efficiency and safety of the packing replacement operation. After the packing is assembled, the rotating plate 17 is rotated in the opposite direction to release the limitation and lower the valve cover 10 to complete the assembly.

[0043] like Figures 1-8 As shown, in a preferred embodiment of the present invention, the self-locking assembly includes a wedge block 18, an inclined surface 19, a slide rod 20, and a spring 21. The two wedge blocks 18 are symmetrically arranged and slidably installed in the locking groove 1301. An inclined surface 19 is provided on the opposite side of each of the two wedge blocks 18. The combined cross section of the two inclined surfaces 19 is hourglass-shaped and matches the double-cone self-locking ring groove 15. The slide rod 20 is slidably installed in the locking groove 1301. One end of the slide rod 20 is fixedly connected to the end of the wedge block 18 away from the inclined surface 19. One end of the spring 21 is fixedly installed in the locking groove 1301, and the other end of the spring 21 is fixedly connected to the end of the wedge block 18 away from the inclined surface 19. The preload of the spring 21 causes the wedge block 18 to move toward the upper valve stem 12.

[0044] In practical application, when the upper valve stem 12 is vertically inserted into the locking groove 1301, the outer wall of the bottom end of the upper valve stem 12 will press the inclined surfaces 19 of the two wedge blocks 18, forcing the wedge blocks 18 to drive the compression spring 21 through the slide rod 20, so that the two wedge blocks 18 slide outward to make room, providing clearance for the upper valve stem 12 to be inserted smoothly. When the bottom end of the upper valve stem 12 is fully in place, the pre-tightening rebound force of the spring 21 will push the two wedge blocks 18 to slide in the opposite direction, so that the inclined surfaces 19 of the wedge blocks 18 are tightly fitted and locked into the double conical self-locking ring groove 15. The circumferential limit and axial locking of the upper valve stem 12 are achieved through the frictional force of the conical surface, effectively preventing the upper valve stem 12 from rotating, loosening, or deviating during operation, and ensuring the synchronous transmission of the upper valve stem 12 and the linkage block 13. At the same time, this rigid locking structure can stably transmit the lifting driving force, ensuring that the gate opening and closing is accurate and controllable, and ensuring the stability of equipment operation under high pressure fracturing conditions.

[0045] like Figures 1-4As shown, in a preferred embodiment of the present invention, the self-locking assembly further includes an extension plate 22, a slider 23, and an unlocking assembly. The two extension plates 22 are symmetrically arranged and slidably installed in the linkage block 13. The extension plate 22 is fixedly connected to the end of the slide rod 20 away from the wedge block 18. The top end of the connecting pipe 4 is provided with a groove 401, and the slider 23 is slidably installed in the groove 401. The slider 23 is driven to move by the unlocking assembly. When the driving assembly drives the upper valve rod 12 to descend, it simultaneously drives the linkage block 13, the lower valve rod 14, and the gate to descend, so that when the manual gate valve 3 is closed, the bottom end of the extension plate 22 slides into the slider 23. When the unlocking assembly drives the slider 23 to move, it simultaneously drives the extension plate 22, the slide rod 20, and the wedge block 18 to move, so that the wedge block 18 moves away from the upper valve rod 12.

[0046] In practical application, before the packing replacement operation, the manual gate valve 3 must be closed to block the high-pressure medium channel and ensure operational safety. After the gate valve is completely closed, the linkage block 13 moves down to the lowest limit position. At this time, the bottom end of the extension plate 22 is stably embedded in the slider 23, realizing the linkage connection between the unlocking structure and the self-locking structure. Subsequently, when the slider 23 is driven to move horizontally by the unlocking component, the slider 23 can simultaneously drive the extension plate 22 and the slide rod 20 to slide as a whole, pulling the wedge blocks 18 on both sides to overcome the pre-tightening force of the spring 21 and disengage outward, completely releasing the locking state of the wedge blocks 18 and the double-cone self-locking ring groove 15, realizing the rapid unlocking and separation of the upper valve stem 12 and the linkage block 13. After the packing is assembled, the slider 23 can be reset by the unlocking component, so that the wedge blocks 18 can be re-engaged into the double-cone self-locking ring groove 15 under the action of the spring 21, quickly restoring the rigid transmission structure of the equipment. When the equipment is running normally, the extension plate 22 rises with the linkage block 13 and disengages from the slider 23, and the unlocking structure will not affect the normal opening and closing operation of the equipment.

[0047] like Figures 1-4 As shown, in a preferred embodiment of the present invention, the unlocking component includes a threaded rod 24 and a nut 25. The threaded rod 24 is slidably installed inside the connecting pipe 4. One end of the threaded rod 24 is fixedly connected to the slider 23. The nut 25 is rotatably installed on the outer circular surface of the connecting pipe 4. The inner wall of the nut 25 is threadedly connected to the outer circular surface of the threaded rod 24. The nut 25 is driven to rotate by an output source.

[0048] In one embodiment, the output source can be manually driven or other mechanisms capable of rotational motion. This embodiment does not impose specific limitations on this.

[0049] In practical applications, the slider 23 is confined within the groove 401 and can only slide horizontally, which simultaneously restricts the circumferential rotational freedom of the threaded rod 24, allowing the threaded rod 24 to only perform horizontal extension and retraction. When the output source drives the nut 25 to rotate, relying on the thread meshing transmission principle, the threaded rod 24 can be precisely driven to extend and retract horizontally, simultaneously driving the slider 23 to move smoothly, thereby achieving precise unlocking and reset of the self-locking structure.

[0050] like Figures 1-5 As shown, in a preferred embodiment of the present invention, a sleeve 9 is slidably sleeved on the outer circular surface of the connecting pipe 5. The height of the sleeve 9 is not less than the interval between the connecting pipe 5 and the fixed plate 6. The top end of the sleeve 9 is fixedly connected to the bottom end of the fixed plate 6 by a plurality of bolts.

[0051] In practical application, during normal fracturing operations, the sleeve 9 is fixedly positioned outside the gap between the connecting pipe 5 and the fixed plate 6, providing all-around protection for precision transmission components such as the valve stem and self-locking assembly. This effectively prevents external dust, impurities, and sewage from intruding into the internal structure, avoiding component corrosion, jamming, and wear, and ensuring long-term stable operation of the equipment. When it is necessary to replace the stuffing box 11 or perform internal component maintenance, simply remove the connecting bolts between the sleeve 9 and the fixed plate 6, and slide the sleeve 9 downwards along the outer wall of the connecting pipe 5 to fully expose the operating area between the connecting pipe 5 and the fixed plate 6.

[0052] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A fracturing wellhead device that is easy to assemble and disassemble, characterized in that: The assembly includes a wellhead assembly (1) and a fracturing head assembly (2). Both the wellhead assembly (1) and the fracturing head assembly (2) include multiple manual gate valves (3), and the wellhead assembly (1) and the fracturing head assembly (2) are connected through a manual gate valve (3). Each manual gate valve (3) is provided with a gate plate, and each manual gate valve (3) is connected to a connecting pipe (4). A lower valve stem (14) is slidably installed in the connecting pipe (4), and the lower valve stem (14) is fixedly connected to the gate plate. The connecting pipe (4) is fixedly mounted with a connecting pipe (5) at the top by multiple bolts. A fixing plate (6) is fixedly mounted at the top of the connecting pipe (5). There is a gap between the connecting pipe (5) and the fixing plate (6). An upper valve stem (12) is slidably mounted inside the fixing plate (6). The upper valve stem (12) is driven by a drive assembly to move up and down. A double-conical self-locking ring groove (15) is provided at the bottom end of the upper valve stem (12). The radius of the double-conical self-locking ring groove (15) decreases and increases upward along the central axis of the upper valve stem (12), forming a structure that is narrow in the middle and wide at both ends. An inner cavity (501) is provided inside the connecting pipe (5). A linkage block (13) is slidably installed inside. A locking groove (1301) is opened in the linkage block (13). A self-locking component is provided in the locking groove (1301). When the bottom end of the upper valve stem (12) is inserted into the locking groove (1301), the self-locking component cooperates with the double conical self-locking ring groove (15) to lock the upper valve stem (12). At this time, the upper valve stem (12) and the linkage block (13) establish a temporary rigid connection. The connecting pipe (5) is filled with a stuffing box (11). The stuffing box (11) is arranged around the outer circle of the upper valve stem (12). A valve cover (10) is provided above the stuffing box (11). The valve cover (10) is fixedly connected to the top of the connecting pipe (5) by multiple bolts.

2. The fracturing wellhead device for easy assembly and disassembly according to claim 1, characterized in that, The drive assembly includes a rotating ring (7) and a handwheel (8). The rotating ring (7) is rotatably mounted on the top of the fixed plate (6). The handwheel (8) is fixedly connected to the outer circular surface of the rotating ring (7). The inner wall of the rotating ring (7) is threadedly connected to the outer circular surface of the upper valve stem (12).

3. The fracturing wellhead device for easy assembly and disassembly according to claim 1, characterized in that, The bottom of the fixed plate (6) is fixedly installed with two symmetrically arranged brackets (601). The bottom of the brackets (601) is fixedly connected to the top of the connecting pipe (5) by bolts.

4. The fracturing wellhead device for easy assembly and disassembly according to claim 1, characterized in that, Two symmetrically arranged fixing rods (16) are fixedly installed at the bottom of the fixed plate (6). A rotating plate (17) is rotatably installed at the bottom of each fixing rod (16). The rotating plate (17) is driven to rotate by a drive source. When the valve cover (10) rises to abut the bottom of the fixed plate (6), the drive source drives the rotating plate (17) to rotate, so that one end of the rotating plate (17) abuts the bottom of the valve cover (10) to achieve a limit.

5. A fracturing wellhead device that is easy to assemble and disassemble according to claim 1, characterized in that, The self-locking assembly includes a wedge block (18), an inclined surface (19), a slide rod (20), and a spring (21). The two wedge blocks (18) are symmetrically arranged and slidably installed in the locking groove (1301). An inclined surface (19) is provided on the opposite side of each of the two wedge blocks (18). The combined cross section of the two inclined surfaces (19) is hourglass-shaped and matches the double-cone self-locking ring groove (15). The slide rod (20) is slidably installed in the locking groove (1301). One end of the slide rod (20) is fixedly connected to the end of the wedge block (18) away from the inclined surface (19). One end of the spring (21) is fixedly installed in the locking groove (1301). The other end of the spring (21) is fixedly connected to the end of the wedge block (18) away from the inclined surface (19). The preload of the spring (21) causes the wedge block (18) to move toward the upper valve stem (12).

6. The fracturing wellhead device for easy assembly and disassembly according to claim 5, characterized in that, The self-locking assembly also includes an extension plate (22), a slider (23), and an unlocking assembly. The two extension plates (22) are symmetrically arranged. The extension plates (22) are slidably installed in the linkage block (13). The extension plate (22) is fixedly connected to the end of the slide rod (20) away from the wedge block (18). The top of the connecting pipe (4) is provided with a groove (401). The slider (23) is slidably installed in the groove (401). The slider (23) is driven to move by the unlocking assembly. When the driving assembly drives the upper valve rod (12) to descend, it simultaneously drives the linkage block (13), the lower valve rod (14), and the gate to descend, so that when the manual gate valve (3) is closed, the bottom end of the extension plate (22) slides into the slider (23). When the unlocking assembly drives the slider (23) to move, it simultaneously drives the extension plate (22), the slide rod (20), and the wedge block (18) to move, so that the wedge block (18) moves away from the upper valve rod (12).

7. A fracturing wellhead device that is easy to assemble and disassemble according to claim 6, characterized in that, The unlocking component includes a threaded rod (24) and a nut (25). The threaded rod (24) is slidably installed inside the connecting pipe (4). One end of the threaded rod (24) is fixedly connected to the slider (23). The nut (25) is rotatably installed on the outer surface of the connecting pipe (4). The inner wall of the nut (25) is threadedly connected to the outer surface of the threaded rod (24). The nut (25) is driven to rotate by the output source.

8. A fracturing wellhead device that is easy to assemble and disassemble according to claim 1, characterized in that, The outer circular surface of the connecting pipe (5) is slidably fitted with a sleeve (9). The height of the sleeve (9) is not less than the interval between the connecting pipe (5) and the fixed plate (6). The top end of the sleeve (9) is fixedly connected to the bottom end of the fixed plate (6) by multiple bolts.

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