A double-sheath single-gas seal joint

Abstract

The utility model relates to a construction engineering machinery, especially a double-slug single-gas seal joint, which comprises an upper sleeve, a rotating shaft and a slurry inlet joint, the rotating shaft is rotationally arranged in the upper sleeve, the rotating shaft is provided with a first slurry channel and a gas channel, and the slurry inlet joint is arranged at the end of the rotating shaft and extends into the first slurry channel, wherein the upper sleeve is sequentially provided with a first ring groove, a slurry passing ring groove and a second ring groove from top to bottom, the first ring groove and the second ring groove are used for stacking and mounting a V-shaped sealing ring, the slurry passing ring groove and the outer wall of the rotating shaft jointly form a slurry passing cavity, the rotating shaft is further provided with a second slurry channel that is in communication with the slurry passing cavity, the first slurry channel, the second slurry channel and the gas channel are staggered in the axial direction of the rotating shaft, the outer wall of the upper sleeve is provided with a slurry inlet opening that is in communication with the slurry passing cavity, the slurry passing cavity is arranged with a V-shaped sealing ring in an up-down manner to avoid slurry leakage, the second slurry channel is in communication with the slurry inlet opening through the slurry passing cavity, and the rotation of the rotating shaft does not affect slurry delivery.

Description

Technical Field

[0001] This utility model relates to construction machinery, and in particular to a double-slurry single-air seal joint. Background Technology

[0002] The existing drill pipe has a single mud channel, and the drill bit has an upper and lower slurry nozzle connected to the mud channel. When drilling down, the lower slurry nozzle sprays mud, and when drilling up, the upper slurry nozzle sprays mud to mix it evenly. The opening and closing of the upper and lower slurry nozzles is achieved by rotating the drill bit forward and backward. However, this makes the drill bit manufacturing complex. It is proposed to adopt a drill pipe with a dual mud channel, which requires the design of a corresponding dual mud and single air seal joint. Utility Model Content

[0003] In view of the technical problems existing in the background art, the present invention aims to provide a double-slurry single-air-sealed joint, wherein the second slurry channel is connected to the slurry inlet through an annular slurry passage cavity, and V-shaped sealing rings are installed on the upper and lower parts of the slurry passage cavity to prevent slurry leakage.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This double-slurry single-air sealing joint includes an upper sleeve, a rotating shaft, and a slurry inlet joint. The rotating shaft is rotatably disposed within the upper sleeve and has a first slurry channel and a gas channel. The slurry inlet joint is disposed at the end of the rotating shaft and extends into the first slurry channel. The upper sleeve has a first annular groove, a slurry-passing annular groove, and a second annular groove arranged sequentially from top to bottom. The first annular groove and the second annular groove are used for stacking V-shaped sealing rings. The slurry-passing annular groove and the outer wall of the rotating shaft together form a slurry-passing cavity. The rotating shaft also has a second slurry channel communicating with the slurry-passing cavity. The first slurry channel, the second slurry channel, and the gas channel are offset axially from the rotating shaft. The outer wall of the upper sleeve has a slurry inlet communicating with the slurry-passing cavity.

[0005] In this scheme, V-shaped sealing rings are arranged at the top and bottom of the slurry passage chamber to prevent slurry leakage. The second slurry channel is connected to the slurry inlet through the slurry passage chamber, and the rotation of the rotating shaft does not affect the slurry transportation.

[0006] Preferably, it also includes an upper cover, which is fastened to the top of the upper sleeve. The upper groove wall of the first annular groove is formed by the bottom surface of the first annular pressure plate. The bottom surface of the upper cover is provided with a first pressure ring for extending into the upper sleeve to press the first annular pressure plate. A first pad is provided between the upper cover and the upper sleeve.

[0007] In this solution, when the stacked V-shaped sealing rings wear down and the sealing effect decreases, the gap between the bottom surface of the upper cover and the top surface of the upper sleeve is narrowed by removing or replacing the first pad with a thinner pad. The first pressure ring presses the first annular pressure plate, thereby pressing the stacked V-shaped sealing rings and restoring the sealing effect.

[0008] Preferably, it also includes a lower cover, which is fastened to the bottom end of the upper sleeve. The lower groove wall of the second annular groove is formed by the top surface of the second annular pressure plate. The top surface of the lower cover is provided with a second pressure ring for extending into the upper sleeve to press the second annular pressure plate. A second pad is provided between the lower cover and the upper sleeve.

[0009] In this solution, when the stacked V-shaped sealing rings wear down and the sealing effect decreases, the gap between the top surface of the lower cover and the bottom surface of the upper sleeve is narrowed by removing or replacing the second pad with a thinner one. The second pressure ring presses the second annular pressure plate, thereby pressing the stacked V-shaped sealing rings and restoring the sealing effect.

[0010] Preferably, bearings are provided between the first annular pressure plate and the first pressure ring, and between the second annular pressure plate and the second pressure ring.

[0011] In this design, the bearing reduces friction between the upper sleeve and the rotating shaft.

[0012] Preferably, the slurry inlet connector is connected to an end cap, and an axial limiting assembly is provided between the end cap and the rotating shaft. The axial limiting assembly includes a first limiting member and a second limiting member that abut against each other. The first limiting member and the second limiting member are respectively disposed on the inner ring of the end cap and the outer ring of the rotating shaft.

[0013] In this scheme, the slurry inlet connector is connected to the end cap, and the end cap and the rotating shaft are axially limited by the first limiting member and the second limiting member. The slurry inlet connector and the rotating shaft are integrated in the axial direction, and the slurry inlet connector will not detach from the rotating shaft.

[0014] Preferably, the inner wall of the mud channel is provided with a third annular groove for stacking and installing V-shaped sealing rings. The upper groove wall of the third annular groove is formed by the bottom surface of the third annular pressure plate. The outer ring of the slurry inlet joint extends with a pressing part for pressing the third annular pressure plate. The slurry inlet joint is fastened to the end cover. A third pad is provided between the slurry inlet joint and the end cover. The end cover is connected to the upper cover.

[0015] In this solution, when the stacked V-shaped sealing rings wear down and the sealing effect decreases, the gap between the bottom surface of the slurry inlet joint and the top surface of the end cap is narrowed by removing or replacing the third gasket with a thinner one. The pressing part presses the third annular pressure plate, thereby pressing the stacked V-shaped sealing rings and restoring the sealing effect.

[0016] Preferably, a bearing is provided between the third annular pressure plate and the pressing part.

[0017] In this design, the bearing reduces friction between the slurry inlet joint and the rotating shaft.

[0018] Preferably, it also includes a lower sleeve, which is provided with a venting annular groove. The venting annular groove and the outer wall of the rotating shaft together form a venting cavity. The venting cavity is connected to the gas channel. The outer ring of the lower sleeve is provided with an air inlet that is connected to the venting cavity.

[0019] In this design, the air inlet and the gas passage remain connected during the rotation of the rotating shaft.

[0020] Preferably, the lower sleeve is connected to the upper sleeve.

[0021] In this design, the lower sleeve supports the upper sleeve.

[0022] Preferably, the lower sleeve is further provided with a fourth annular groove, a fifth annular groove, a sixth annular groove and a seventh annular groove from top to bottom. The venting annular groove is located between the fifth annular groove and the sixth annular groove. The fifth annular groove and the sixth annular groove are for installing O-rings, and the fourth annular groove and the seventh annular groove are for installing lip seals.

[0023] In this design, two seals, one above and one below, ensure airtightness.

[0024] The beneficial effects of this utility model are as follows: V-shaped sealing rings are arranged above and below the slurry passage chamber to prevent slurry leakage; the second slurry channel is connected to the slurry inlet through the slurry passage chamber; the rotation of the rotating shaft does not affect the slurry conveying; when the stacked V-shaped sealing rings wear down, causing a decrease in sealing effect, the sealing effect can be restored by removing or replacing the corresponding thinner pad, and the corresponding pressure ring pressing the corresponding annular pressure plate. Therefore, this utility model has substantial features and progress compared with the prior art. Attached Figure Description

[0025] The following description, in conjunction with the accompanying drawings, details the embodiments and working principles of this utility model.

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0027] Figure 2 This is a three-dimensional structural diagram of the slurry inlet connector and end cap in this utility model.

[0028] Figure 3 This is a three-dimensional structural diagram of the upper and lower sleeves in this utility model.

[0029] In the diagram: 1. Upper sleeve; 2. Rotating shaft; 3. Slurry inlet joint; 4. First slurry channel; 5. Gas channel; 6. Slurry passage ring groove; 7. Slurry passage chamber; 8. Second slurry channel; 9. Slurry inlet; 10. Upper cover; 11. First annular pressure plate; 12. First pressure ring; 13. Lower cover; 14. Second annular pressure plate; 15. Second pressure ring; 16. Bearing; 17. End cover; 18. Axial limiting assembly; 19. First limiting component; 20. Second limiting component; 21. Third annular pressure plate; 22. Pressing part; 23. Lower sleeve; 24. Ventilation ring groove; 25. Ventilation chamber; 26. Air inlet. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the implementation of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0031] In the description of this application, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] In the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0033] See appendix Figure 1-3 In this embodiment, a double-slurry single-air sealing joint includes an upper sleeve 1, a rotating shaft 2, and a slurry inlet joint 3. The rotating shaft 2 is rotatably disposed inside the upper sleeve 1. The rotating shaft 2 is provided with a first mud channel 4 and a gas channel 5. The slurry inlet joint 3 is disposed at the end of the rotating shaft 2 and extends into the first mud channel 4.

[0034] The upper sleeve 1 is provided with a first annular groove, a slurry passage annular groove 6 and a second annular groove from top to bottom. The first annular groove and the second annular groove are used for stacking and installing V-shaped sealing rings. The slurry passage annular groove 6 and the outer wall of the rotating shaft 2 together form a slurry passage cavity 7. The rotating shaft 2 is also provided with a second mud channel 8 that communicates with the slurry passage cavity 7. The first mud channel 4, the second mud channel 8 and the gas channel 5 are misaligned in the axial direction of the rotating shaft 2. The outer wall of the upper sleeve 1 is provided with a slurry inlet 9 that communicates with the slurry passage cavity 7.

[0035] It also includes an upper cover 10, which is fastened to the top of the upper sleeve 1. The upper groove wall of the first annular groove is formed by the bottom surface of the first annular pressure plate 11. The bottom surface of the upper cover 10 is provided with a first pressure ring 12 for extending into the upper sleeve 1 to press the first annular pressure plate 11. A first pad is provided between the upper cover 10 and the upper sleeve 1.

[0036] It also includes a lower cover 13, which is fastened to the bottom end of the upper sleeve 1. The lower groove wall of the second annular groove is formed by the top surface of the second annular pressure plate 14. The top surface of the lower cover 13 is provided with a second pressure ring 15 for extending into the upper sleeve 1 to press the second annular pressure plate 14. A second pad is provided between the lower cover 13 and the upper sleeve 1. Bearings 16 are provided between the first annular pressure plate 11 and the first pressure ring 12, and between the second annular pressure plate 14 and the second pressure ring 15.

[0037] In this embodiment, during drilling down or pulling up, the mud is input into the drill pipe through the second mud channel 8. During assembly, the V-shaped sealing rings are stacked and placed, and the corresponding annular pressure plates and bearings 16 are placed in sequence. The first pressure ring 12 of the upper cover 10 and the second pressure ring 15 of the lower cover 13 extend into the upper sleeve 1 to press against the bearings 16. Finally, the first pad and the second pad are placed, and the upper cover 10 and the lower cover 13 are respectively fastened to the upper sleeve 1. When the V-shaped sealing ring fails, the corresponding pad with a smaller thickness is removed or replaced, and the upper cover 10 and the upper sleeve 1, and the lower cover 13 and the upper sleeve 1 are retightened. The corresponding annular pressure plates press the V-shaped sealing rings.

[0038] See appendix Figure 2 The slurry inlet connector 3 is connected to an end cap 17. An axial limiting component 18 is provided between the end cap 17 and the rotating shaft 2. The axial limiting component 18 includes a first limiting member 19 and a second limiting member 20 that abut against each other. The first limiting member 19 and the second limiting member 20 are respectively disposed on the inner ring of the end cap 17 and the outer ring of the rotating shaft 2.

[0039] The inner wall of the mud channel is provided with a third annular groove for stacking V-shaped sealing rings. The upper wall of the third annular groove is formed by the bottom surface of the third annular pressure plate 21. The outer ring of the mud inlet connector 3 extends with a pressing part 22 for pressing the third annular pressure plate 21. The mud inlet connector 3 is fastened to the end cover 17. A third pad is provided between the mud inlet connector 3 and the end cover 17. The end cover 17 is connected to the upper cover 10. A bearing 16 is provided between the third annular pressure plate 21 and the pressing part 22.

[0040] In this embodiment, when drilling down or pulling up, the mud is input into the drill pipe through the first mud channel 4. During assembly, the first limiting member 19 and the second limiting member 20 are abutted together, the stacked V-shaped sealing rings are placed, the third annular pressure plate 21 and the bearing 16 are placed in sequence, the mud inlet connector 3 is inserted into the first mud channel 4, the third pad is placed, and the end cap 17 is fastened to the mud inlet connector 3 so that the clamping part 22 presses the second bearing 16 and the stacked V-shaped sealing rings together. When the V-shaped sealing ring fails, the third pad with a small thickness is removed or replaced, and the end cap 17 and the mud inlet connector are tightened again. The clamping part 22 presses the bearing 16, the third annular pressure plate 21 and the V-shaped sealing ring together.

[0041] The slurry inlet joint 3 is equipped with a slurry inlet; the first limiting member 19 is a bearing 16, and the second limiting member 20 is embedded in the outer ring of the rotating shaft 2.

[0042] See appendix Figure 3 It also includes a lower sleeve 23, which has a venting annular groove 24. The venting annular groove 24 and the outer wall of the rotating shaft 2 together form a venting cavity 25. The venting cavity 25 is connected to the gas channel 5. The outer ring of the lower sleeve 23 has an air inlet 26 that is connected to the venting cavity 25. The lower sleeve 23 is connected to the upper sleeve 1. The lower sleeve 23 also has a fourth annular groove, a fifth annular groove, a sixth annular groove and a seventh annular groove from top to bottom. The venting annular groove 24 is located between the fifth annular groove and the sixth annular groove. The fifth annular groove and the sixth annular groove are for O-ring installation, and the fourth annular groove and the seventh annular groove are for lip seal installation.

[0043] In this embodiment, after installing the lip seal and O-ring, the rotating shaft 2 is inserted into the lower sleeve 23. Bearings 16 are provided at both ends of the lower sleeve 23. The upper end of the lower sleeve 23 is fastened to the bottom cover to press the upper bearing 16. The rotating shaft 2 is designed with a step to cooperate with the lower sleeve 23 to press the lower bearing 16. The rotating shaft 2 is designed as a split type to facilitate installation.

[0044] The above description represents the preferred embodiment of this utility model. It should be noted that the protection scope of this utility model is not limited thereto. For those skilled in the art, various improvements, modifications, or equivalent substitutions can be made without departing from the equivalent inventive concept disclosed in this utility model, and these modifications and substitutions are also considered to be within the protection scope of this utility model.

Claims

1. A double-slurry single-gas sealing joint, comprising an upper sleeve (1), a rotating shaft (2), and a slurry inlet joint (3), wherein the rotating shaft (2) is rotatably disposed within the upper sleeve (1), the rotating shaft (2) is provided with a first slurry channel (4) and a gas channel (5), and the slurry inlet joint (3) is disposed at the end of the rotating shaft (2) and extends into the first slurry channel (4), characterized in that: The upper sleeve (1) is provided with a first annular groove, a slurry passage annular groove (6) and a second annular groove from top to bottom. The first annular groove and the second annular groove are for stacking and installing V-shaped sealing rings. The slurry passage annular groove (6) and the outer wall of the rotating shaft (2) together form a slurry passage cavity (7). The rotating shaft (2) is also provided with a second mud channel (8) that communicates with the slurry passage cavity (7). The first mud channel (4), the second mud channel (8) and the gas channel (5) are misaligned in the axial direction of the rotating shaft (2). The outer wall of the upper sleeve (1) is provided with a slurry inlet (9) that communicates with the slurry passage cavity (7).

2. The double-screw single-air-seal joint as described in claim 1, characterized in that: It also includes an upper cover (10), which is fastened to the top of the upper sleeve (1). The upper groove wall of the first annular groove is formed by the bottom surface of the first annular pressure plate (11). The bottom surface of the upper cover (10) is provided with a first pressure ring (12) for extending into the upper sleeve (1) to press the first annular pressure plate (11). A first pad is provided between the upper cover (10) and the upper sleeve (1).

3. The double-screw single-air-sealed joint as described in claim 2, characterized in that: It also includes a lower cover (13), which is fastened to the bottom end of the upper sleeve (1). The lower groove wall of the second annular groove is formed by the top surface of the second annular pressure plate (14). The top surface of the lower cover (13) is provided with a second pressure ring (15) for extending into the upper sleeve (1) to press the second annular pressure plate (14). A second pad is provided between the lower cover (13) and the upper sleeve (1).

4. The double-screw single-air-seal joint as described in claim 3, characterized in that: Bearings (16) are provided between the first annular pressure plate (11) and the first pressure ring (12), and between the second annular pressure plate (14) and the second pressure ring (15).

5. A double-screw single-air-seal joint as described in claim 2, characterized in that: The slurry inlet connector (3) is connected to an end cap (17). An axial limiting component (18) is provided between the end cap (17) and the rotating shaft (2). The axial limiting component (18) includes a first limiting member (19) and a second limiting member (20) that abut against each other. The first limiting member (19) and the second limiting member (20) are respectively disposed on the inner ring of the end cap (17) and the outer ring of the rotating shaft (2).

6. A double-screw single-air-seal joint as described in claim 5, characterized in that: The inner wall of the mud channel is provided with a third annular groove for stacking and installing V-shaped sealing rings. The upper groove wall of the third annular groove is formed by the bottom surface of the third annular pressure plate (21). The outer ring of the mud inlet joint (3) extends with a pressing part (22) for pressing the third annular pressure plate (21). The mud inlet joint (3) is fastened to the end cap (17). A third pad is provided between the mud inlet joint (3) and the end cap (17). The end cap (17) is connected to the upper cover (10).

7. A double-screw single-air-sealed joint as described in claim 6, characterized in that: A bearing (16) is provided between the third annular pressure plate (21) and the pressing part (22).

8. A double-screw single-air-seal joint as described in claim 1, characterized in that: It also includes a lower sleeve (23), which is provided with a ventilation ring groove (24). The ventilation ring groove (24) and the outer wall of the rotating shaft (2) together form a ventilation cavity (25). The ventilation cavity (25) is connected to the gas channel (5). The outer ring of the lower sleeve (23) is provided with an air inlet (26) that is connected to the ventilation cavity (25).

9. A double-screw single-air-seal joint as described in claim 8, characterized in that: The lower sleeve (23) is connected to the upper sleeve (1).

10. A double-screw single-air-seal joint as described in claim 8, characterized in that: The lower sleeve (23) is further provided with a fourth ring groove, a fifth ring groove, a sixth ring groove and a seventh ring groove from top to bottom. The venting ring groove (24) is located between the fifth ring groove and the sixth ring groove. The fifth ring groove and the sixth ring groove are for O-ring installation, and the fourth ring groove and the seventh ring groove are for lip seal installation.

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