Sealing cover for lower bearing of power head of gas lift reverse circulation drilling machine

Abstract

The invention discloses a gas lift reverse circulation drilling machine power head lower bearing sealing cover which comprises a sealing cover plate, an inner hole protrusion, an outer hole protrusion and a sealing assembly, a shaft through hole is formed in the middle of the sealing cover plate and used for sealing and installing a bearing, and meanwhile a shaft and the bearing are rotationally installed. An inner hole protrusion is arranged on the surface of the inner side of the sealing cover plate in the circumferential direction of the edge of the shaft through hole, a first sealing groove is formed in the side, away from the shaft through hole, of the inner wall of the inner hole protrusion, and the problem of forced lubricating oil leakage of the lower bearing is effectively solved. The sealing cover which is separated from the bearing seat is adopted, and the auxiliary holes which are convenient to disassemble and assemble are arranged, so that the maintenance performance is effectively improved. The structure is simple, the sealing performance is good, the cost is low, and the practicability is wide.

Description

Technical Field

[0001] The invention relates to the technical field of bearing sealing covers, and in particular to a lower bearing sealing cover of a power head of an air lift reverse circulation drilling rig. Background Art

[0002] The power head of the gas lift reverse circulation drilling rig is installed vertically, and it is very important to seal the lower bearing of its output shaft (hollow shaft). The existing sealing cover for installing bearing seals has the following main shortcomings: first, it is made into one piece with the bearing cover, which is not easy to maintain; second, there is a lack of effective sealing between the bearing cover; third, it is inconvenient to disassemble and assemble. Therefore, it is necessary to design a lower bearing sealing cover with simple structure, good sealing performance, and easy disassembly and assembly.

[0003] As for the prior art, the publication (announcement) number: CN219975143U discloses a rear bearing cover sealing structure. It includes a rear bearing cover housing, a flange is sleeved inside the rear bearing cover housing, an oil seal is arranged between the rear bearing cover housing and the flange, a stopper is arranged on the rear bearing cover housing, and a dust cover is sleeved on the stopper and the flange. The setting of the dust cover can effectively prevent dust from entering the interior of the rear bearing cover housing. A plurality of connected drainage grooves are provided on the end face and the stopper of the rear bearing cover housing. The drainage grooves are used to discharge the accumulated liquid inside the rear bearing cover housing, ensure the dryness of the interior of the rear bearing cover housing, and prevent rust. The drainage groove and the dust cover form a U-shaped channel, which can effectively prevent dust from entering the interior of the rear bearing cover housing while discharging the accumulated liquid in the drainage groove.

[0004] For this reason, it is necessary to provide a lower bearing sealing cover of a power head of a gas lift reverse circulation drilling rig. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a bearing sealing cover under the power head of an air lift reverse circulation drilling rig, aiming to realize a bearing sealing cover with a simple structure, good sealing performance and easy disassembly and assembly.

[0006] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a lower bearing sealing cover of a gas lift reverse circulation drilling rig power head, comprising a sealing cover plate, an inner hole protrusion, an outer hole protrusion, and a sealing assembly, wherein a shaft through hole is provided in the middle of the sealing cover plate for sealing and installing the bearing while allowing the shaft and the bearing to be rotatably installed, an inner hole protrusion is provided on the surface of the inner side of the sealing cover plate along the circumferential direction of the edge of the shaft through hole, a sealing groove is provided on the side of the inner wall of the inner hole protrusion away from the shaft through hole, an outer hole protrusion is provided on the outer peripheral surface of the inner wall of the sealing cover plate, and the outer hole protrusion is concentrically arranged with the inner hole protrusion A sealing groove 2 is provided on the inner side of the outer hole protrusion away from the sealing cover plate, a sealing groove 3 is provided on the circumferential surface of the sealing cover plate outside the outer hole protrusion, countersunk screw holes are evenly provided on the outer circumference of the sealing cover plate, and the countersunk screw holes extend to the inside of the sealing groove 3, and threaded holes are evenly provided on the outer surface of the sealing cover plate located between the countersunk screw holes, and the threaded holes extend to the inside of the sealing groove 3. The sealing assembly includes a seal 1, a seal 2 and a seal 3, and the sealing groove 1, the sealing groove 2 and the sealing groove 3 are correspondingly sealed with seals 1, 2 and 3.

[0007] Preferably, the inner diameter of the inner hole protrusion is 5.0 mm to 5.2 mm larger than the inner diameter of the inner ring of the sleeve on the bearing.

[0008] Preferably, the inner diameter of the outer hole protrusion is consistent with the outer diameter of the sealing member three.

[0009] Preferably, eight countersunk screw holes are evenly arranged on the outer circumference of the sealing cover plate.

[0010] Preferably, three threaded holes are evenly formed on the outer surface of the sealing cover plate between the countersunk screw holes.

[0011] Preferably, the depth of the sealing groove 1 on the inner hole protrusion is not less than 1 / 3 times the height of the sleeve on the bearing.

[0012] In summary, the present invention provides a lower bearing sealing cover for a power head of a gas lift reverse circulation drilling rig. Due to the adoption of the above technical solution, the present invention adopts an optimized structure adapted to dynamic seals and static seals, effectively solving the leakage problem of the forced lubricating oil of the lower bearing; adopts a sealing cover separated from the bearing seat, and effectively improves the maintenance performance by setting a process hole for easy disassembly and assembly. It has a simple structure, good sealing performance, low cost, and wide practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the bearing sealing cover of the present invention; Figure 2 It is a schematic diagram of the structures of sealing groove 1, sealing groove 2 and sealing groove 3 of the present invention; Figure 3 is a schematic diagram of the sealing assembly structure of the present invention; Figure 4 It is a schematic diagram of the structure of the countersunk screw hole and the threaded hole of the present invention; In the figure: sealing cover plate 1, inner hole protrusion 2, outer hole protrusion 3, sealing assembly 4, shaft through hole 5, sealing groove one 6, sealing groove two 7, sealing groove three 11, countersunk screw hole 12, threaded hole 13, sealing element one 14, sealing element two 15, sealing element three 16. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] like Figures 1 to 4 As shown: The present invention is a bearing sealing cover under the power head of a gas lift reverse circulation drilling rig, comprising a sealing cover plate 1, an inner hole protrusion 2, an outer hole protrusion 3, and a sealing assembly 4. The middle part of the sealing cover plate 1 is provided with a shaft through hole 5, which is used for sealing and installing the bearing while allowing the shaft and the bearing to be rotatably installed. The inner surface of the sealing cover plate 1 is provided with an inner hole protrusion 2 along the circumference of the edge of the shaft through hole 5. The inner wall of the inner hole protrusion 2 is provided with a sealing groove 6 on the side away from the shaft through hole 5. The outer peripheral surface of the inner wall of the sealing cover plate 1 is provided with an outer hole protrusion 3, which is concentrically arranged with the inner hole protrusion 2, and the inner part of the outer hole protrusion 3 is provided with a sealing groove 6 on the side away from the sealing cover plate 1. Sealing groove 2 7, a sealing groove 3 11 is provided on the circumferential surface of the sealing cover plate 1 outside the outer hole protrusion 3, countersunk screw holes 12 are evenly provided on the outer circumference of the sealing cover plate 1, and the countersunk screw holes 12 extend to the inside of the sealing groove 3 11, and threaded holes 13 are evenly provided on the outer surface of the sealing cover plate 1 located between the countersunk screw holes 12, and the threaded holes 13 extend to the inside of the sealing groove 3 11, the sealing assembly 4 includes a seal 14, a seal 2 15 and a seal 3 16, and the sealing groove 1 6, the sealing groove 2 7 and the sealing groove 3 11 are correspondingly sealed with a seal 14, a seal 2 15 and a seal 3 16.

[0016] In order to solve the technical problems in the prior art, the technical structure adopted by the present invention is as follows: the inner side of the sealing cover plate 1 adopts an inner hole protrusion 2 and an outer hole protrusion 3 structure setting, the inner wall end face of the inner hole protrusion 2 is provided with a sealing groove 1 6, and the inner wall end face of the outer hole protrusion 3 is provided with a sealing groove 2 7. When the sealing cover plate 1 is installed to seal the bearing, the inner wall surface of the sealing groove 1 6 is contacted with the inner ring end face of the bearing, and the inner wall surface of the sealing groove 2 7 is contacted with the outer ring end face of the bearing. The sealing cover plate 1 is provided with countersunk screw holes 12 and threaded holes 13 in the circumference, and the sealing cover plate 1 is fixedly installed on the lower part of the power head by countersunk bolts and bolts, and the sealing cover plate 1 is provided with a sealing groove 3 11 on the circumferential surface of the sealing cover plate 1 outside the outer hole protrusion 3, and a sealing member 3 16 is provided inside the sealing groove 3 11 to increase the sealing performance of the sealing cover plate 1 installation, so as to improve the sealing installation of the bearing; through the setting of this structure, the sealing installation of the bearing and the installation that is convenient for disassembly are increased, and the technical problems of integrated type, difficult disassembly and poor sealing performance are solved; In order to improve the sealing performance, a seal 14 is arranged inside the sealing groove 16, and a seal 2 15 is arranged inside the sealing groove 2 7. By setting the seal 14 between the inner ring of the bearing and the sealing groove 16, and setting the seal 2 15 between the outer ring of the bearing and the sealing groove 2 7, the sealing cover plate 1 is further sealed and installed on the bearing, thereby solving the technical problem of poor sealing performance in the prior art.

[0017] In at least one embodiment, in order to improve the sealing performance of the inner hole protrusion 2 to the bearing and the sealing installation relationship with the sleeve on the bearing, the dimensions adopted are: the inner diameter of the inner hole protrusion 2 is 5.0 mm to 5.2 mm larger than the inner diameter of the inner ring of the sleeve on the bearing; Preferably, the inner diameter of the inner hole protrusion 2 is 5.0 mm larger than the inner diameter of the inner ring of the sleeve on the bearing.

[0018] At least in one embodiment, in order to achieve the sealing effect of the sealing cover plate 1 on the bearing, the technical method is adopted as follows: the inner diameter size of the outer hole protrusion 3 is consistent with the outer diameter size of the sealing member 3 16, and the outer circumferential sealing installation of the sealing cover plate 1 and the lower part of the power head is increased, which effectively improves the sealing installation of the bearing.

[0019] In at least one embodiment, eight countersunk screw holes 12 are evenly formed on the outer circumference of the sealing cover plate 1 .

[0020] In at least one embodiment, three threaded holes 13 are evenly formed on the outer surface of the sealing cover plate 1 between the countersunk screw holes 12 .

[0021] In at least one embodiment, in order to realize the sealing sleeve installation between the inner hole protrusion 2 and the inner ring of the bearing, the technical structure is as follows: the depth dimension of the sealing groove 6 on the inner hole protrusion 2 is not less than 1 / 3 times the height of the sleeve on the bearing; Preferably, the depth dimension of the sealing groove 6 on the inner hole protrusion 2 is 1 / 3 times the height of the sleeve on the bearing.

[0022] The embodiments of the present invention are only used to illustrate the present invention and do not constitute a limitation on the scope of the claims. Other substantially equivalent substitutes that can be thought of by those skilled in the art are all within the protection scope of the present invention.

Claims

1. A lower bearing sealing cover of a gas lift reverse circulation drilling rig power head, characterized in that: The invention comprises a sealing cover plate (1), an inner hole protrusion (2), an outer hole protrusion (3), and a sealing assembly (4). The middle part of the sealing cover plate (1) is provided with a shaft through hole (5) for sealing and installing the bearing while enabling the shaft and the bearing to be rotatably installed. The inner surface of the sealing cover plate (1) is provided with an inner hole protrusion (2) along the circumference of the edge of the shaft through hole (5). A sealing groove 1 (6) is provided on the inner wall of the inner hole protrusion (2) away from the shaft through hole (5). An outer hole protrusion (3) is provided on the outer circumferential surface of the inner wall of the sealing cover plate (1). The outer hole protrusion (3) is concentrically arranged with the inner hole protrusion (2). A sealing groove 2 (7) is provided on the inner side of the outer hole protrusion (3) away from the sealing cover plate (1). A sealing groove three (11) is formed on the circumferential surface of the sealing cover plate (1) surrounding the sealing cover plate, countersunk screw holes (12) are formed evenly on the outer circumference of the sealing cover plate (1), and the countersunk screw holes (12) extend into the interior of the sealing groove three (11), and threaded holes (13) are formed evenly on the outer surface of the sealing cover plate (1) between the countersunk screw holes (12), and the threaded holes (13) extend into the interior of the sealing groove three (11), and the sealing assembly (4) comprises a sealing member one (14), a sealing member two (15) and a sealing member three (16), and the sealing groove one (6), the sealing groove two (7) and the sealing groove three (11) are correspondingly provided with sealing members one (14), a sealing member two (15) and a sealing member three (16).

2. The gas lift reverse circulation drilling rig power head lower bearing sealing cover according to claim 1, characterized in that: The inner diameter of the inner hole protrusion (2) is 5.0 mm to 5.2 mm larger than the inner diameter of the inner ring of the shaft sleeve on the bearing.

3. The gas lift reverse circulation drilling rig power head lower bearing sealing cover according to claim 1, characterized in that: The inner diameter of the outer hole protrusion (3) is consistent with the outer diameter of the sealing member three (16).

4. The gas lift reverse circulation drilling rig power head lower bearing sealing cover according to claim 1, characterized in that: Eight countersunk screw holes (12) are evenly arranged on the outer circumference of the sealing cover plate (1).

5. The gas lift reverse circulation drilling rig power head lower bearing sealing cover according to claim 1, characterized in that: Three threaded holes (13) are evenly arranged on the outer surface of the sealing cover plate (1) between the countersunk screw holes (12).

6. The gas lift reverse circulation drilling rig power head lower bearing sealing cover according to claim 1, characterized in that: The depth of the sealing groove 1 (6) on the inner hole protrusion (2) is not less than 1 / 3 times the height of the shaft sleeve on the bearing.

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