Washing pipe assembly and top drive device

Abstract

The utility model belongs to the technical field of drilling equipment, and discloses a wash pipe assembly and a top drive device, which comprise a wash pipe, an upper sealing component and a lower sealing component, and effectively prevent liquid leakage through a plurality of sealing interfaces. A first sealing ring in the lower sealing assembly is arranged at the joint of a lower sealing box and the main shaft, a pressing piece is used for pressing a sealing piece, the sealing piece presses the first sealing ring, and double sealing between the main shaft and the washing pipe and between the washing pipe and the sealing piece is achieved. The pressing piece capable of being pre-tightened keeps pressing force all the time, the sealing state is ensured, and even if the gap is enlarged due to abrasion of the sealing piece and the washing pipe, the pressing piece automatically releases part of pre-tightening force, the gap change is compensated, and the sealing performance is maintained. The washing pipe assembly and the top drive device can automatically adjust the pressing force according to the abrasion condition of the sealing piece and the washing pipe, the replacement frequency of the sealing piece is reduced, the service life of equipment is prolonged, the operation cost is reduced, the downtime is shortened, and the operation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling equipment, in particular to a swivel subassembly and a top drive device. Background Technique

[0002] The top drive device is a drilling equipment used to replace the traditional rotary table. By rotating the drill pipe, the torque on the ground is transmitted to the drill bit to achieve the drilling operation. As an important part of the top drive device, the swivel subassembly is usually used to transport mud or drilling fluid and is connected to the drill pipe through the top drive device to ensure that the drilling fluid can effectively enter the well through the pipeline system. Since the swivel and the seal will wear during operation, the gap between them will increase, affecting the sealing effect and even causing leakage of the swivel, which will seriously affect the efficiency and safety of the drilling operation.

[0003] Currently, the swivel subassembly usually relies on the tightening force during the initial installation to ensure the seal between the swivel and the seal. However, too large a tightening force will cause excessive wear of the swivel and the seal, shortening their service life; while too small a tightening force may not ensure sufficient sealing, resulting in leakage of the swivel. Moreover, in the prior art, the sealing effect between the swivel and the seal cannot be automatically adjusted according to the actual wear situation. To restore the sealed state, new components usually need to be replaced, increasing the cost and time of the drilling operation. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a swivel subassembly and a top drive device, which can automatically adjust the pressing force between the swivel and the seal and automatically compensate for the gap between them according to the actual wear situation of the swivel and the seal, thereby ensuring the sealed state between the swivel and the seal, maintaining the sealing performance, prolonging the service life of the swivel, reducing the cost of the drilling operation, and improving the operation efficiency.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A swivel subassembly, comprising a swivel and an upper seal assembly. The upper seal assembly is sleeved on the upper end of the outer wall of the swivel and is used for connecting with the gooseneck pipe and sealing the swivel. Wherein, the swivel subassembly further comprises:

[0007] Lower sealing assembly, the lower sealing assembly includes a lower sealing box, a seal, a first sealing ring and a pressing member; the lower sealing box is sleeved on the lower end of the outer wall of the wash pipe and is used for connecting with the main shaft; the seal is arranged in the lower sealing box and is annularly arranged on the outer wall of the wash pipe; the first sealing ring is arranged at the connection between the lower sealing box and the main shaft, and one side of the seal facing the bottom end of the lower sealing box abuts against the first sealing ring; the pressing member can be pre-tightly abutted against one side of the seal facing the top end of the lower sealing box, and the pressing member can maintain a tendency of continuously pressing the seal, and is used for automatically adjusting the pressing force between the wash pipe and the seal and automatically compensating for the gap between the wash pipe and the seal.

[0008] Further, the lower sealing assembly includes a plurality of the pressing members, and the plurality of the pressing members are sequentially and spaced apart annularly around the central axis of the wash pipe in the circumferential direction of the wash pipe.

[0009] Further, the pressing member includes an adjusting block, a first pressing sleeve and a first pre-tightening spring. The adjusting block is arranged between the seal and the top end of the lower sealing box. The adjusting block abuts against the top end of the lower sealing box and the seal respectively. The thickness of the adjusting block gradually increases from the outer wall of the wash pipe to the side wall of the lower sealing box; the first pre-tightening spring is arranged in the first pressing sleeve. The first pressing sleeve is screwed with the side wall of the lower sealing box and abuts against the side wall of the adjusting block. The first pre-tightening spring can maintain a tendency of continuously pressing the adjusting block.

[0010] Further, one side of the adjusting block facing the top end of the lower sealing box is parallel to the top end of the lower sealing box; the slope of one side of the adjusting block facing the seal is not greater than 30°.

[0011] Further, the pressing member includes an adjusting screw, a second pressing sleeve and a second pre-tightening spring. The second pre-tightening spring is arranged in the second pressing sleeve. The second pressing sleeve is screwed with the top end of the lower sealing box and abuts against the seal. The adjusting screw is screwed with the second pressing sleeve. The adjusting screw can press the second pre-tightening spring. The second pre-tightening spring can maintain a tendency of continuously pressing the seal.

[0012] Further, the pressing member includes a disc spring. The disc spring is arranged between the top end of the lower sealing box and the seal. The disc spring can maintain a tendency of continuously pressing the seal.

[0013] Further, the lower sealing assembly further includes a limiting member. The limiting member is annularly arranged between the first sealing ring and the side wall of the lower sealing box and is located at the bottom end of the seal, and is used for fixing the position of the bottom end of the seal.

[0014] Furthermore, the lower sealing assembly further includes an injection valve which penetrates through the side wall of the lower sealing box and is used for injecting lubricant into the lower sealing box.

[0015] Furthermore, the upper sealing assembly includes an upper sealing box, a second sealing ring, a third sealing ring and a locking ring; the upper sealing box is sleeved on the upper end of the outer wall of the swivel pipe; the second sealing ring is sleeved between the outer wall of the swivel pipe and the inner wall of the upper sealing box; the third sealing ring is arranged at the connection between the upper sealing box and the gooseneck pipe, and the locking ring can fix the relative position between the swivel pipe and the third sealing ring.

[0016] A top drive device includes a gooseneck pipe conversion joint, a main shaft, a swivel pipe support and a swivel pipe assembly as described in any one of the above. The upper sealing assembly is connected to the gooseneck pipe through the gooseneck pipe conversion joint, the lower sealing assembly is connected to the main shaft, and the swivel pipe assembly is installed inside the swivel pipe support.

[0017] Advantages of the present utility model:

[0018] The present utility model provides a swivel pipe assembly and a top drive device, including a swivel pipe, an upper sealing assembly and a lower sealing assembly. By forming multiple sealing interfaces with the upper sealing assembly and the lower sealing assembly, liquid leakage can be effectively prevented. In the lower sealing assembly, the first sealing ring is arranged at the connection between the lower sealing box and the main shaft. The sealing member is pressed by the pressing member, and the sealing member presses the first sealing ring, so that effective sealing is achieved both at the connection between the main shaft and the swivel pipe and between the swivel pipe and the sealing member. By using a pre-tightenable pressing member, a certain pressing force is always maintained between the pressing member and the sealing member, so that the sealing member always maintains a good sealing state during operation to prevent liquid leakage. And as the sealing member and the swivel pipe gradually wear during use and the gap between them increases, the pressing member with a pre-tightening force automatically releases a part of the pre-tightening force, so that the pressing member can maintain the tendency of continuously pressing the sealing member. The pressing member can automatically compensate for the gap change between the sealing member and the swivel pipe and maintain the effectiveness of the seal. Since the swivel pipe assembly can automatically adjust the pressing force according to the wear conditions of the swivel pipe and the sealing member, the replacement times of the sealing member can be reduced, the service life of the equipment can be extended, the operation cost can be reduced, the downtime for replacing parts can be reduced, and the operation efficiency can be improved. Description of the Drawings

[0019] Figure 1 is a sectional view of the first embodiment of the swivel pipe assembly of the present utility model;

[0020] Figure 2 is a sectional view of the second embodiment of the swivel pipe assembly of the present utility model;

[0021] Figure 3It is a sectional view of the third embodiment of the flush pipe assembly of the present utility model.

[0022] In the figure:

[0023] 1. Flush pipe;

[0024] 2. Upper sealing assembly; 21. Upper sealing box; 22. Second sealing ring; 23. Third sealing ring; 24. Locking ring;

[0025] 3. Lower sealing assembly; 31. Lower sealing box; 32. Sealing member; 33. First sealing ring; 34. Compressing member; 341. Adjusting block; 342. First compressing sleeve; 343. First pre-tightening spring; 344. Adjusting screw; 345. Second compressing sleeve; 346. Second pre-tightening spring; 347. Disc spring; 35. Limiting member; 36. Injection valve. Detailed implementation manners

[0026] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0027] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above and over", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below and under", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0029] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] Referring to Figures 1 to 3 As shown, the present utility model provides a washpipe assembly, which can automatically adjust the pressing force between the washpipe 1 and the seal 32 and automatically compensate for the gap between them according to the actual wear conditions of the washpipe 1 and the seal 32, thereby ensuring the sealing state between the washpipe 1 and the seal 32, maintaining the sealing performance, prolonging the service life of the washpipe assembly, reducing the cost of drilling operations, and improving the operation efficiency. The washpipe assembly includes a washpipe 1, an upper seal assembly 2, and a lower seal assembly 3. The upper seal assembly 2 is sleeved on the upper end of the outer wall of the washpipe 1 for connecting with the gooseneck pipe and sealing the washpipe 1. The lower seal assembly 3 includes a lower seal box 31, a seal 32, a first sealing ring 33, and a pressing member 34. The lower seal box 31 is sleeved on the lower end of the outer wall of the washpipe 1 for connecting with the main shaft. The seal 32 is arranged in the lower seal box 31 and annularly arranged on the outer wall of the washpipe 1. The first sealing ring 33 is arranged at the connection between the lower seal box 31 and the main shaft, and one side of the seal 32 facing the bottom end of the lower seal box 31 abuts against the first sealing ring 33. The pressing member 34 can be pre-tightly abutted against one side of the seal 32 facing the top end of the lower seal box 31. The pressing member 34 can maintain a continuous tendency to press the seal 32, and is used for automatically adjusting the pressing force between the washpipe 1 and the seal 32 and automatically compensating for the gap between the washpipe 1 and the seal 32.

[0031] By sleeving the upper sealing assembly 2 and the lower sealing assembly 3 on the outer wall of the wash pipe 1 to form multiple sealing interfaces, liquid leakage can be effectively prevented. In the lower sealing assembly 3, the first sealing ring 33 is arranged at the connection between the lower sealing box 31 and the main shaft. The sealing member 32 is pressed by the pressing member 34, and the sealing member 32 presses the first sealing ring 33, so that effective sealing is achieved both at the connection between the main shaft and the wash pipe 1 and between the wash pipe 1 and the sealing member 32, ensuring the overall sealing performance of the wash pipe assembly. By using the pressing member 34 that can be pre-tightened, a certain pressing force is always maintained between the pressing member 34 and the sealing member 32. As a result, the sealing member 32 always maintains a good sealing state during operation to prevent liquid leakage. And as the sealing member 32 and the wash pipe 1 gradually wear during use, the gap between them increases, affecting the sealing effect. The pressing member 34 with a pre-tightening force automatically releases a part of the pre-tightening force, so that the pressing member 34 can maintain the tendency of continuously pressing the sealing member 32. The pressing member 34 can automatically compensate for the change in the gap between the sealing member 32 and the wash pipe 1 and maintain the effectiveness of the seal. Since the wash pipe assembly can automatically adjust the pressing force according to the wear conditions of the wash pipe 1 and the sealing member 32, it can reduce the replacement times of the sealing member 32, extend the service life of the equipment, reduce the operation cost, reduce the downtime for replacing parts, and improve the operation efficiency.

[0032] Continue as Figure 1 As shown, in order to prevent the sealing member 32 from moving, in some embodiments, the lower sealing assembly 3 further includes a limiting member 35. The limiting member 35 is arranged in a ring shape between the first sealing ring 33 and the side wall of the lower sealing box 31 and is located at the bottom end of the sealing member 32 for fixing the position of the bottom end of the sealing member 32 unchanged. The limiting member 35 can effectively fix the position of the bottom end of the sealing member 32, ensuring that when the pressing member 34 applies a pre-tightening force, the sealing member 32 can deform to achieve the sealing effect and prevent the displacement of the sealing member 32 due to changes such as vibration and impact during operation, which may lead to the failure of the contact surface, thereby reducing the risk of liquid leakage and ensuring the sealing performance and reliability of the wash pipe assembly. The limiting member 35 can be, but is not limited to, a limiting ring, and no specific limitation is made here.

[0033] As Figure 1 As shown, in order to extend the service life of the wash pipe assembly, the lower sealing assembly 3 further includes an injection valve 36. The injection valve 36 penetrates the side wall of the lower sealing box 31 and is used to inject lubricant into the lower sealing box 31. By injecting lubricant into the lower sealing pipe using the injection valve 36, the friction between the sealing member 32 and the wash pipe 1 can be effectively reduced, wear can be reduced, and the service lives of the sealing member 32 and the wash pipe 1 can be extended. In addition, the lubricant can fill the tiny gaps between the sealing member 32 and the sealing box, further enhancing the sealing performance, preventing liquid or gas leakage, and maintaining the sealing state. The injection valve 36 can be, but is not limited to, a grease nipple, and no specific limitation is made here.

[0034] In order to enhance the sealing effect, in some embodiments, the lower sealing assembly 3 includes a plurality of pressing members 34, and the plurality of pressing members 34 are sequentially arranged at intervals around the central axis of the washpipe 1 in the circumferential direction of the washpipe 1; the plurality of pressing members 34 are arranged at intervals around the washpipe 1 to ensure that the sealing member 32 is uniformly stressed in the circumferential direction, effectively avoiding the problems of deformation and leakage of the sealing member 32 caused by uneven single-point stress, making the sealing surface keep consistent fitting in the whole circumferential direction, and preventing the sealing member 32 from loosening or having gaps at local positions; at the same time, the spaced pressing members 34 can compensate by uniformly applying pressure when gaps are generated in the sealing member 32 due to wear or deformation. Further, the plurality of pressing members 34 are evenly spaced, which can ensure that the sealing member 32 is uniformly stressed in the whole circumferential direction. The number of the pressing members 34 can be set to 3, 4, 5, etc., and no specific limitation is made here.

[0035] Continue as Figure 1As shown, in some embodiments, the pressing member 34 includes an adjusting block 341, a first pressing sleeve 342, and a first pre-tightening spring 343. The adjusting block 341 is disposed between the sealing member 32 and the top end of the lower sealing box 31. The adjusting block 341 abuts against the top end of the lower sealing box 31 and the sealing member 32 respectively. The thickness of the adjusting block 341 gradually increases from the outer wall of the washing pipe 1 towards the side wall of the lower sealing box 31. A first pre-tightening spring 343 is disposed inside the first pressing sleeve 342. The first pressing sleeve 342 is screwed to the side wall of the lower sealing box 31 and abuts against the side wall of the adjusting block 341. The first pre-tightening spring 343 can maintain a tendency to continuously press the adjusting block 341. The operator first tightens the first pressing sleeve 342 one by one. The first pressing sleeve 342 pushes the adjusting block 341, and the adjusting block 341 gathers towards the central axis direction of the washing pipe 1. The adjusting block 341 squeezes the sealing member 32. Since the limiting member 35 restricts the position of the bottom end of the sealing member 32, the sealing member 32 undergoes elastic deformation to fit and squeeze the washing pipe 1 and the first sealing ring 33, achieving a sealing effect. Then, the first pre-tightening spring 343 is compressed and deformed inside the first pressing sleeve 342, maintaining a tendency to continuously press the adjusting block 341. As the sealing member 32 wears during operation, the pressing force of the sealing member 32 on the washing pipe 1 gradually decreases. At this time, the first pre-tightening spring 343 releases the pre-tightening force, enabling the adjusting block 341 to continuously press the sealing member 32, realizing automatic adjustment of the pressing force between the sealing member 32 and the washing pipe 1, and automatically compensating the gap between the two. By making the thickness of the adjusting block 341 gradually increase from the outer wall of the washing pipe 1 towards the side wall of the lower sealing box 31, the adjusting block 341 can act on the sealing member 32 at the best angle when under pressure. The change in the thickness of the adjusting block 341 makes the adjusting block 341 fit the surface of the sealing member 32 more closely during installation and use, achieving uniform fitting between the sealing member 32 and the outer wall of the washing pipe 1, and preventing deformation or damage of the sealing member 32 caused by uneven stress. Through the cooperation of the first pressing sleeve 342 and the first pre-tightening spring 343, the first pressing sleeve 342 is screwed to the side wall of the lower sealing box 31 and abuts against the side wall of the adjusting block 341, which can ensure the accuracy of pressure transmission. The first pre-tightening spring 343 disposed inside the first pressing sleeve 342 can continuously apply force to the adjusting block 341 and transmit it to the surface of the sealing member 32, thus ensuring that the sealing member 32 always remains in a pressed state. The first pre-tightening spring 343 can automatically adjust the applied pressure according to the wear conditions of the sealing member 32 and the washing pipe 1. Even when the sealing member 32 wears due to long-term use and the gap between the two increases, the pre-tightening spring can still maintain the pressing force of the sealing member 32, realizing automatic compensation for the gap between the sealing member 32 and the washing pipe 1, and thus continuously maintaining the sealing effect.

[0036] Further, one side of the adjusting block 341 facing the top end of the lower sealing box 31 is parallel to the top end of the lower sealing box 31; the slope of the adjusting block 341 facing the sealing member 32 is not greater than 30°; keeping one side of the adjusting block 341 facing the top end of the lower sealing box 31 parallel to it ensures that the adjusting block 341 has a large contact area when fixed, which can improve the fixing effect of the adjusting block 341, prevent it from tilting or shifting when subjected to pressure or external vibration, and thus maintain the stability of the sealing system. Limiting the slope of the adjusting block 341 facing the sealing member 32 to not greater than 30° ensures the stability during force transmission, can reduce the possibility of sliding while maintaining the effectiveness of pressure transmission, ensure that the force can continuously and stably act on the sealing member 32, and helps guide the adjusting block 341 to press the sealing member 32 at an appropriate angle, so that the adjusting block 341 can closely fit with the sealing member 32 without excessive friction, thereby improving the sealing effect.

[0037] As Figure 2 shown, in some other embodiments, the pressing member 34 includes an adjusting screw 344, a second pressing sleeve 345, and a second pre-tightening spring 346. The second pre-tightening spring 346 is arranged inside the second pressing sleeve 345. The second pressing sleeve 345 is screwed to the top end of the lower sealing box 31 and abuts against the sealing member 32. The adjusting screw 344 is screwed to the second pressing sleeve 345. The adjusting screw 344 can press the second pre-tightening spring 346, and the second pre-tightening spring 346 can maintain a tendency to continuously press the sealing member 32. The operator can tighten the second pressing sleeve 345 one by one. The second pressing sleeve 345 can abut against the sealing member 32, causing the sealing member 32 to undergo elastic deformation to fit and squeeze the flushing pipe 1 and the first sealing ring 33 to achieve the sealing effect; then the second pre-tightening spring 346 is compressed and deformed inside the second pressing sleeve 345, maintaining a tendency to continuously press the sealing member 32, and can automatically adjust the pressing force and automatically compensate for the gap; since the adjusting screw 344 can press the second pre-tightening spring 346, when the pre-tightening force is insufficient, the operator can conveniently adjust the pre-tightening force of the second pre-tightening spring 346 by rotating the adjusting screw 344, and can flexibly adjust the pressing force according to the actual working conditions and the wear condition of the sealing member 32, so as to ensure that the best sealing state is always maintained.

[0038] As Figure 3As shown, in some other embodiments, the pressing member 34 includes a disc spring 347. The disc spring 347 is disposed between the top end of the lower sealing box 31 and the seal 32, and the disc spring 347 is capable of maintaining a tendency to continuously press the seal 32. The disc spring 347 has good elasticity and adaptability, and can maintain a continuous pressure during the compression process, and can automatically adjust to maintain the pressing force on the seal 32, thereby ensuring good sealing performance. At the same time, the design of the disc spring 347 enables the pressure applied to the seal 32 to be evenly distributed, avoiding excessive local force application, and reducing damage or failure of the seal 32 caused by stress concentration. The uniform pressure distribution can effectively enhance the sealing effect and ensure that each contact surface is evenly stressed.

[0039] In some embodiments, the upper sealing assembly 2 includes an upper sealing box 21, a second sealing ring 22, a third sealing ring 23, and a locking ring 24. The upper sealing box 21 is sleeved on the outer wall of the wash pipe 1 at the upper end. The second sealing ring 22 is sleeved between the outer wall of the wash pipe 1 and the inner wall of the upper sealing box 21. The third sealing ring 23 is disposed at the connection between the upper sealing box 21 and the gooseneck pipe, and the locking ring 24 can fix the relative position between the wash pipe 1 and the third sealing ring 23. Among them, multiple sealing rings (the second sealing ring 22 and the third sealing ring 23) in the upper sealing assembly 2 provide multiple seals to ensure a good sealing state at the connection between the wash pipe 1 and the gooseneck pipe. The second sealing ring 22 can effectively seal the wash pipe 1 to prevent liquid leakage. The third sealing ring 23 is disposed at the connection between the upper sealing box 21 and the gooseneck pipe, and the design of the locking ring 24 can fix the third sealing ring 23, effectively preventing the third sealing ring 23 from shifting or loosening during operation, and ensuring a good sealing state at the connection between the sealing box and the gooseneck pipe.

[0040] It should be noted that the seal 32 may include, but is not limited to, packing and a seal seat, and no specific limitation is made here.

[0041] The present utility model also provides a top drive device, which includes a gooseneck pipe adapter, a main shaft, a swab tube bracket, and a swab tube assembly as described in any of the above embodiments. The upper sealing assembly 2 of the swab tube assembly is connected to the gooseneck pipe through the gooseneck pipe adapter, the lower sealing assembly 3 is connected to the main shaft, and the swab tube assembly is installed inside the swab tube bracket. By sleeving the upper sealing assembly 2 and the lower sealing assembly 3 on the outer wall of the swab tube 1, multiple sealing interfaces are formed, which can effectively prevent liquid leakage. Among them, in the lower sealing assembly 3, the first sealing ring 33 is arranged at the connection between the lower sealing box 31 and the main shaft. The sealing member 32 is pressed by the pressing member 34, and the sealing member 32 presses the first sealing ring 33, so that effective sealing is achieved both at the connection between the main shaft and the swab tube 1 and between the swab tube 1 and the sealing member 32. By using the pressing member 34 that can be pre-tightened, a certain pressing force is always maintained between the pressing member 34 and the sealing member 32. Furthermore, the sealing member 32 always maintains a good sealing state during operation to prevent liquid leakage. And as the sealing member 32 and the swab tube 1 gradually wear during use, the gap between them increases, affecting the sealing effect. The pressing member 34 with a pre-tightening force automatically releases a part of the pre-tightening force, so that the pressing member 34 can maintain the tendency of continuously pressing the sealing member 32. The pressing member 34 can automatically compensate for the gap change between the sealing member 32 and the swab tube 1 and maintain the effectiveness of the seal. Since the swab tube assembly can automatically adjust the pressing force according to the wear conditions of the swab tube 1 and the sealing member 32, the replacement times of the sealing member 32 can be reduced, the service life of the equipment can be extended, the operation cost can be reduced, the downtime for replacing parts can be reduced, and the operation efficiency can be improved.

[0042] Obviously, the above embodiments of the present utility model are merely examples for clearly explaining the present utility model, rather than limiting the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. Flushing pipe assembly, comprising a flushing pipe (1) and an upper sealing assembly (2), wherein the upper sealing assembly (2) is sleeved on the upper end of the outer wall of the flushing pipe (1) and is used for connecting with a gooseneck pipe and sealing the flushing pipe (1), and is characterized in that, The flushing pipe assembly further includes: A lower sealing assembly (3), which includes a lower sealing box (31), a sealing member (32), a first sealing ring (33), and a pressing member (34); the lower sealing box (31) is sleeved on the lower end of the outer wall of the flushing pipe (1) and is used for connecting with the main shaft; the sealing member (32) is arranged in the lower sealing box (31) and is annularly arranged on the outer wall of the flushing pipe (1); the first sealing ring (33) is arranged at the connection between the lower sealing box (31) and the main shaft, and one side of the sealing member (32) facing the bottom end of the lower sealing box (31) abuts against the first sealing ring (33); the pressing member (34) can be pre-tightly abutted against one side of the sealing member (32) facing the top end of the lower sealing box (31), and the pressing member (34) can maintain a tendency of continuously pressing the sealing member (32), and is used for automatically adjusting the pressing force between the flushing pipe (1) and the sealing member (32) and automatically compensating for the gap between the flushing pipe (1) and the sealing member (32).

2. The flushing pipe assembly according to claim 1, wherein, The lower sealing assembly (3) includes a plurality of the pressing members (34), and the plurality of the pressing members (34) are sequentially and spaced annularly arranged around the central axis of the flushing pipe (1) in the circumferential direction of the flushing pipe (1).

3. The flushing pipe assembly according to claim 2, wherein The pressing member (34) includes an adjusting block (341), a first pressing sleeve (342), and a first pre-tightening spring (343). The adjusting block (341) is arranged between the sealing member (32) and the top end of the lower sealing box (31), the adjusting block (341) abuts against the top end of the lower sealing box (31) and the sealing member (32) respectively, and the thickness of the adjusting block (341) gradually increases from the outer wall of the flushing pipe (1) to the side wall of the lower sealing box (31); the first pre-tightening spring (343) is arranged in the first pressing sleeve (342), the first pressing sleeve (342) is screwed to the side wall of the lower sealing box (31) and abuts against the side wall of the adjusting block (341), and the first pre-tightening spring (343) can maintain a tendency of continuously pressing the adjusting block (341).

4. The flushing pipe assembly according to claim 3, wherein, One side of the adjusting block (341) facing the top end of the lower sealing box (31) is parallel to the top end of the lower sealing box (31); the slope of the adjusting block (341) facing the sealing member (32) is not greater than 30°.

5. The flushing pipe assembly according to claim 2, wherein The pressing member (34) includes an adjusting screw (344), a second pressing sleeve (345), and a second pre-tightening spring (346). The second pre-tightening spring (346) is arranged in the second pressing sleeve (345), the second pressing sleeve (345) is screwed to the top end of the lower sealing box (31) and abuts against the sealing member (32), the adjusting screw (344) is screwed to the second pressing sleeve (345), the adjusting screw (344) can press the second pre-tightening spring (346), and the second pre-tightening spring (346) can maintain a tendency of continuously pressing the sealing member (32).

6. The flushing pipe assembly according to claim 1, wherein The pressing member (34) includes a disc spring (347), and the disc spring (347) is disposed between the top end of the lower seal box (31) and the seal member (32), and the disc spring (347) can maintain a tendency of continuously pressing the seal member (32).

7. The flushing pipe assembly according to any one of claims 1-6, characterized in that, The lower seal assembly (3) further includes a limiting member (35). The limiting member (35) is disposed annularly between the first sealing ring (33) and the side wall of the lower seal box (31), and is located at the bottom end of the seal member (32) for fixing the position of the bottom end of the seal member (32).

8. The flushing pipe assembly according to any one of claims 1-6, characterized in that, The lower seal assembly (3) further includes an injection valve (36). The injection valve (36) penetrates through the side wall of the lower seal box (31) for injecting lubricant into the lower seal box (31).

9. The flushing pipe assembly according to any one of claims 1-6, characterized in that, The upper seal assembly (2) includes an upper seal box (21), a second sealing ring (22), a third sealing ring (23) and a locking ring (24); the upper seal box (21) is sleeved on the outer wall of the upper end of the wash pipe (1); the second sealing ring (22) is sleeved between the outer wall of the wash pipe (1) and the inner wall of the upper seal box (21); the third sealing ring (23) is disposed at the connection between the upper seal box (21) and the gooseneck pipe, and the locking ring (24) can fix the relative position between the wash pipe (1) and the third sealing ring (23).

10. Top drive device, comprising a gooseneck adapter, a main shaft and a swivel pipe support, characterized in that, The top drive device further includes a wash pipe assembly according to any one of claims 1-9. The upper seal assembly (2) is connected to the gooseneck pipe through the gooseneck pipe adapter. The lower seal assembly (3) is connected to the main shaft, and the wash pipe assembly is installed inside the wash pipe bracket.

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