• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A drilling tool includes a roller mounted for rotation on a bearing shaft extending from a drill head. The roller has a first flat base surface, the opposite second flat base surface of the drill head. A first annular groove is formed in the first planar base surface, and a second annular groove is formed in the second planar base surface. The first and second annular grooves are at least partially aligned with each other. The combination of the first and second annular grooves forms a first annular stuffing box. A guard ring is inserted into the first annular stuffing box, and acts by dividing a path between the bearing shaft of the drilling tool and the external environment into a plurality of parallel paths, which pass the round guard ring. Each parallel id path includes a curvature defined by a plurality of directional corners.
    公开号:SE1351507A1
    申请号:SE1351507
    申请日:2012-05-11
    公开日:2013-12-16
    发明作者:Thomas Gallifet
    申请人:Varel Int Ind Lp；
    IPC主号:
    专利说明:

    P162634.SE.01 which has been press-fitted into the roller 3. This bushing 24 is an annular structure, typically made of beryllium copper, although the use of other materials is known in the art. The ball bearings 12 are located in an annular bearing path 26 defined at the interface between the bearing shaft 2 and the roller 3. The second cylindrical sliding bearing 14 of the bearing system is defined by an outer cylindrical surface 30 on the bearing shaft 2 and an inner cylindrical surface 32 on the roller 3. The outer cylindrical surface The first radial sliding bearing 16 is defined between the first and second cylindrical sliding bearings 10 and 12 by a first radial surface 40 on the bearing shaft 2 and a second radial surface 42 on the roller 3. The second radial sliding bearing is radially offset inwardly from the outer cylindrical surface 20. the plain bearing 18 is located adjacent to the second cylindrical plain bearing 12 at the axis of rotation of the roller and is defined by a third radial surface 50 on the bearing shaft 2 and a fourth radial surface 52 on the roller 3.
    Lubricant is provided in the first cylindrical plain bearing 10, the second cylindrical plain bearing 14, the first radial plain bearing 16 and the second radial plain bearing 18 between the opposing cylindrical and radial surfaces using the system 6. It is crucial to retain the lubricant in positions between the opposing cylinders. the surfaces of the bearing system. Retention of the lubricant requires that a slip seal be formed between the bearing system and the outer environment of the drill bit.
    An O-ring seal 60 is positioned in a sealing gasket box 64 between the cutting roller 3 and the bearing shaft 2 to retain lubricant and exclude external dirt. A sealing hub with a cylindrical surface 62 is provided on the bearing shaft. In the illustrated configuration, this surface of the sealing hub 62 is radially offset outwardly [with the thickness of the bushing 24] from the outer cylindrical surface 20 of the first plain bearing 10. It will be appreciated that the sealing hub, if desired, need not have any displacement with respect to on the surface of the main plain bearing (see for example figure 3). The annular sealing stuffing box 64 is formed in the roller 3. The stuffing box 64 and the sealing hub 62 are in line with each other when the cutting roller 3 is rotatably positioned on the bearing shaft. The O-ring seal 60 is compressed between the surface (s) of the stuffing box 64 and the sealing hub 62, while the O-ring seal 60 slides on the surface 62 of the sealing hub and acts to retain lubricant in the bearing area around the bearing systems. This seal also helps to prevent material (drilling mud and dirt) in the well bore from entering the bearing area. 10 15 20 25 30 P162634.EN.01 Early seals for rock drill bits were constructed with a metallic Belleville spring, clad with an elastomer, usually nitrile rubber (N BR). Significant progress was made in rock drill bit seals when O-ring type seals were introduced (see Galle, U.S. Patent No. 3,397,928, the contents of which are hereby incorporated by reference).
    These O-ring seals were made of nitrile rubber and had a circular cross section.
    The seal was fitted in a radial stuffing box, formed by cylindrical surfaces between the head and the cone bearing, and the annular space formed was smaller than the original dimension as measured as the cross section of the seal. Schumacher (U.S. Patent No. 3,765,495, the contents of which are hereby incorporated by reference) discloses a variation of this seal by elongating the radial dimension which, compared to the seal disclosed by Galle, requires less percentage compression to form an effective seal.
    Several other minor variations of this sealing concept have been used, each relying on an elastomeric seal that is compressed radially in a stuffing box, formed by cylindrical surfaces between the two bearing elements, and are well known to those skilled in the art. Over time, the rock drill bit industry has gone from a standard nitrile material for the sealing ring to a highly saturated nitrile load for increased stability in terms of properties (heat resistance, chemical resistance).
    The use of a sealing member in bearings for rock drill bits has dramatically increased the bearing life over the past fifty years. The longer the seal excludes contamination from the bearing, the longer the life of the bearing and the drill bit.
    The seal thus constitutes a critical component in the rock drill bit. The service life of the seal is actually limited by damage to and wear of the seal. The seal 60 is retained in the stuffing box 64 and slides on the bearing shaft (at the surface 62) and acts by separating the grease of the bearing from the external environment (drilling mud, air, drill cuttings, etc.). The presence of abrasive particles (known as detritus) introduced into the seal from the external environment tends to accelerate the abrasion of the seal 60. For example, if the abrasive particles are of sufficient size (or quantity), the seal 60 may tear.
    To solve this problem, it is known to those skilled in the art to create some kind of curvature 80 in the outer space between the sealing stuffing box and the external environment. This curvature is created by the geometry of the head and the roller. Figure 1 illustrates an example in a sealed layer P162634.SE.01 of such a curve 80, which is created by configuring the geometry of the head and the roller to introduce a corner 82 (in this case formed by a right angle ) in the mellan path between the seal 60 and the external environment 84. Figure 2 illustrates another example of such a curvature 80 in a sealed layer, which is created by configuring the geometry of the head and the roller to introduce two corners 86 and 88 (each in this case formed by an obtuse angle, although right angles or mixed angles could be used) in the mellan path between the seal 60 and the outer environment 84. A further corner 82 (in this case formed by an obtuse angle, even if a right angle could be used, and positioned in a manner similar to the only corner shown in Figure 1) is also provided in the fluid path. Figure 3 illustrates another example of such a curvature 80, which is created by configuring the geometry of the head and the roller to introduce two corners 86 and 88 (each in this case formed by an obtuse angle, even if right angles or mixed angles could be used) in the fluid path between the seal 60 and the external environment 84. The included curvature 80 acts by preventing the passage of abrasive particles (detritus) from the external environment 84 in the direction of the seal 60.
    We now refer to Figure 4, which shows the use of a shield for the labyrinth seal 90 in a sealed layer to introduce the curvature 80 in the outer space between the seal 60 and the external environment 84. The shield for the labyrinth seal 90 is an L-shaped ring structure ( in cross section). An annular groove 92 is formed in a radial base surface 91 of the roller 3. The annular groove 92 is radially offset from the sealing stuffing box through the surface 94. The shorter leg of the L-shaped cover of the labyrinth seal 90 is inserted into the annular groove 92, with the longer the leg of the L-shaped labyrinth sealing ring 90 positioned between the roller 3 (surface 91) and the radial base surface 93 of the head 1 adjacent the shaft 2. We refer to Shotwell, U.S. Patent No. 4,613,004, the contents of which are hereby incorporated by reference. .
    We now also refer to Figure 5. The labyrinth seal cover 90 divides the fluid path between the seal 60 and the outer environment 84 into a first outer path 300 extending around the surfaces of the annular groove 92 and the surface 94 (passing corners 95, 96, 97 and 98) and a second outer surface 302 extending along the radial base surface 93 of the head 1 adjacent the shaft 2 and the cylindrical surface 62 (passing the corner 82). The dashed lines in Figure 5 generally illustrate the surfaces of the head, shaft and roller adjacent the cover 90 and the seal 60. The first and second fluid paths 300 and 302 are parallel to each other with respect to passing around it. The L-shaped protective ring for the labyrinth seal 90. Although the introduction of a curvature 80 into the first fluid path 300 requires the passage of four corners (95, 96, 97 and 98), the configuration of Figure 4 still presents a second outer path 302 having a curvature 80 with only a single corner (82).
    There is a need for an improved protective structure for the labyrinth seal and configuration that provides better protection against the passage of abrasive particles (detritus) from the external environment 84 toward the seal 60.
    It is also known in the art to have an open bearing (ie a non-sealed bearing, which does not use an enclosed lubricant) in certain applications. The open bearing may comprise either a plain bearing or a roller bearing, or any combination of bearing structures and systems. The problem of excluding contamination from the warehouse, in order to extend the warehouse life, is also a concern with an open warehouse. Thus, there is a need in the art for an improved labyrinth type and configuration protection structure that provides better protection against the passage of abrasive particles (detritus) from the external environment toward the bearing structure.
    We further refer to the following prior art references (the contents of all references are hereby incorporated by reference): U.S. Patent Nos. 3,656,764, 4,102,419, 4,179,003,4,200,343, 4,209,890, 4,613,004, 5,005,989, 5,027,911, 5,224,560, 5,513,715, 5,570,750, 5,740,871, 6,254,275 and 7,798,248, and U.S. Patent Application Publication No. 2010/0038144.
    SUMMARY In one embodiment, a drilling tool comprises: a drilling head having a radially extending base surface; at least one bearing shaft extending from the drill head; a roller, mounted for rotation on the bearing shaft and having a radially extending base surface; a first annular groove formed in the radially extending base surface of the roller; a second annular groove formed in the radially extending base surface of the drill head, the first annular groove being aligned with at least a portion of the second annular groove; and a protective ring having a size and shape to fit between the roller and the drill head, positioned within both the first and second annular grooves.
    In one embodiment, a drilling tool comprises: a roller mounted for rotation on a bearing shaft extending from a drill head, the roller having a first radially extending planar base surface opposite a second radially extending planar base surface of the drill head; a first annular groove formed in the first radially extending planar base surface; a second annular groove formed in the second radially extending planar base surface, the first annular groove being aligned with at least a portion of the second annular groove, the combination of the first and second annular grooves forming a first annular packing box; and a protective ring inserted into the first annular stuffing box.
    In one embodiment, a drilling tool comprises: a roller mounted for rotation on a bearing shaft extending from a drill head, the roller having a first radially extending planar base surface opposite a second radially extending planar base surface of the drill head; a first annular groove formed in the first radially extending planar base surface, the first annular groove having first and second opposite side walls; a second annular groove formed in the second radially extending planar base surface, the second annular groove having first and second opposite side walls, the first side wall of the first annular groove being radially aligned with the first side wall of the second annular groove, wherein the combination of the first and second annular grooves forms a first annular stuffing box; and a protective ring inserted into the first annular stuffing box.
    In one embodiment, a drilling tool includes: a roller mounted for rotation on a bearing shaft extending from a drill head, the roller having a first planar base surface opposite a second planar base surface of the drill head; a first annular groove formed in the first planar base surface; a second annular groove formed in the second planar base surface, the first and second annular grooves being at least partially aligned with each other, and the combination of the first and second annular grooves forming a first annular packing box; and a guard ring inserted into the first annular stuffing box, which acts by dividing a fluid path between the bearing shaft of the drilling tool and an external environment into a plurality of parallel fluid paths, which pass around the guard ring. Each parallel id path includes a curvature defined by a plurality of direction-changing corners.
    BRIEF DESCRIPTION OF THE DRAWINGS We now refer to the figures, in which: Figures 1, 2 and 3 each illustrate a partially sectioned view of a typical roller drill bit showing a curved structure for sealing protection according to the prior art; Figure 4 illustrates a partially sectioned view of a typical roller drill bit showing a protective structure for a labyrinth seal according to the prior art; Figure 5 illustrates the divided parallel fluid paths presented in the structure of Figure 4; Figure 6 illustrates a partially sectioned view of a roller drill bit showing an embodiment of an improved labyrinth seal / bearing protective structure; Figure 7A illustrates the divided parallel fl paths presented in the structure of Figure 6; Figure 7B illustrates the divided parallel fluid paths presented in an alternative implementation; Figure 8 illustrates a partially sectioned view of a roller drill bit showing an embodiment of an improved labyrinth seal / bearing protective structure; Figure 9A illustrates the divided parallel fl paths presented in the structure of Figure 8; Figure 9B illustrates the divided parallel fluid paths presented in an alternative implementation; and Figures 10-12 illustrate alternative forms of the labyrinth seal / layer protective structure.
    DETAILED DESCRIPTION OF THE DRAWINGS We now refer to Figure 6, which illustrates a partially sectioned view of a roller drill bit showing an embodiment of an improved protective structure for a labyrinth seal / layer. Identical reference numerals refer to identical or similar parts in Figures 1-5. The improved protective structure for a labyrinth seal / bearing in Figure 6 uses an L-shaped (in cross section) protective ring 190 for the labyrinth seal / bearing, similar to the protective ring 90 in Figure 4. However, a different geometry of the head and roller is provided to support installation of the protective ring. 190 for the labyrinth seal / bearing and 10 15 20 25 30 P162634EN.01 the introduction of an improved curvature 180 in the mellan path between the seal 60 and the external environment 84. Although the illustration is made for use with a sealed bearing, which includes the seal 60 in the stuffing box 64, it will be appreciated that the labyrinth seal / bearing protective ring 190 is equally useful in an open bearing (without seal) to introduce an improved curvature 180 in the outer space between the bearing 10 and the outer environment 84. The presence of the stuffing box 64 and the seal 60 in Figure 6 is provided for illustrative purposes only and constitutes an optional structure used in the implementation of the sealed layer. Although the illustration is made with a plain bearing, it will be appreciated that the labyrinth seal / bearing protective ring 190 is useful for protecting any type of bearing, including shaft journals and roller bearings.
    A first annular groove 192 is formed in a radial base surface 91 of the roller 3 (this radial base surface 91 forms a rear surface of the roller), the groove 192 including opposite side walls and a bottom. The first annular groove 192 is radially offset from the seal stuffing box through the surface 94 (i.e., the surface 94 separates a side wall of the groove 192 from the area of the sealing stuffing box 64, if present). The surface 94 may in one embodiment comprise a section of the radial base surface 91 (in other words, the surface 94 and the surface 91 lie in the same plane). In another embodiment, the surface 94 may comprise a surface defined by the formation of the first annular groove 192 itself (in other words, the surface 94 and the surface 91 are parallel, but do not lie in the same plane). In the alternative open bearing surface 94, the surface 94 is an offset separating a side wall of the groove 192 from the cylindrical bearing surface of the shaft 2. A second annular groove 194 is formed in a radial base surface 93 of the head 1 adjacent the shaft 2, this radial base surface 93 is opposed to the radial base surface 91 which forms a rear surface of the roller, the groove 194 including opposite side walls and a bottom. The second annular groove 194 is radially offset from the cylindrical sealing surface 62 by a section 193 of the radial base surface 93 (i.e., the surface 93 separates a side wall of the groove 194 from the shaft 2 and the sealing surface 62). The surface defined by section 193 thus lies, in a preferred implementation, in the same plane as the radial base surface 93. As an alternative, the surface defined by section 193 is produced by the formation of the second annular groove 194 (and is thus parallel to, but is not in the same plane as, surface 93). At least a portion of the second annular groove 194 is radially aligned with the first annular groove 192. In a preferred implementation, a side wall of the first annular groove 192 is radially aligned with a corresponding side wall of the second annular groove 194.
    The first and second annular grooves 192 and 194 together define an L-shaped (in cross-section) annular ring packing box, which accepts the L-shaped (in cross-section) protective ring 190 for the labyrinth seal / bearing. The L-shaped labyrinth seal / bearing protective ring 190 is dimensioned and shaped to conform to the annular opening in the ring packing box, but does not constitute a press-fitted element and will actually exhibit some play around its periphery with respect to the annular ring packing box. One leg (e.g., the shorter leg) of the L-shaped labyrinth seal / bearing protective ring 190 is inserted into the first annular groove 192. Another leg (e.g., the longer leg) of the L-shaped labyrinth seal / bearing protective ring 190 is inserted into the second annular groove 194. With the described geometry of the head and roller and the location of the L-shaped protection ring 190 for the labyrinth seal / bearing, it should be noted that the L-shaped protection ring 190 for the labyrinth seal / bearing is positioned between the roller 3 and the shaft 2 (so that, in the implementation of the sealed layer, it lies between the external environment and the seal, and it, in the implementation of the open layer, lies between the external environment and the layer).
    We now also refer to Figures 7A and 7B, Figure 7A illustrating the implementation of the sealed layer and Figure 7B illustrating the implementation of the open layer. The described geometry of the head and roller and the location of the L-shaped labyrinth seal / bearing protective ring 190 divides the path between the seal 60 (in Figure 7A) and / or the bearing 10 (in Figure 7B) and the outer environment 84 in a first outer path. 300 extending around the surfaces of the first annular groove 192 (passing corners 195, 196, 197 and 198) and a second fluid path 302 extending around the surfaces of the second annular groove 194 (passing corners 199, 200 and 201). The dashed lines in Figures 7A and 7B generally illustrate the surfaces of the head, shaft and roller adjacent the guard 190 and the seal 60 / bearing 10. The first and second surfaces 300 and 302 are parallel to each other with respect to passing around the L-shaped guard ring 190. for the labyrinth seal / bearing. Thus, this configuration not only divides the path between the seal 60 / bearing 10 and the external environment 84 into first and second paths 300 and 302 (similar to the protection of the labyrinth seal in Figures 4 and 5), but further ensures that each of the first and second id surfaces 300 and 302 has a curvature 180 comprising at least two (and more preferably, än more than two) corners. the implementation in Figure 6 actually shows a curvature 180 with respect to the first 300 surface 300 having four corners (195, 196, 197 and 198), which is at least as many as presented with the first 300 surface 300 in Figures 4 and 5, and a curvature 180 with respect to the second 30 path 302 having at least three corners (199, 200 and 201, with the additional corner 207 in Figure 713), which is substantially fl greater than that presented by the second 30 path 302 in Figures 4 and 5.
    The fluid paths at each corner change direction at a right angle to the curve.
    However, it should be noted that the angle of curvature could alternatively have a blunt (and perhaps pointed) angular configuration. Although a cross-sectional L-shaped protection ring 190 for the labyrinth seal / bearing is illustrated as a preferred implementation, it should be appreciated that the protection ring 190 for the labyrinth seal / bearing could have other cross-sectional shapes, including a T-shape, which would similarly provide a division of the fl uidbanan into fl your parallel paths, each of which has a curvature, including at least two, and more preferably at least three, corners. See Figure 10. In another implementation, the labyrinth seal / bearing protective ring 190 could instead have a bar-shaped (I-shaped) configuration in cross section, which would provide a division of the id surface into fl your parallel paths, each having a curvature, including at least two, and more preferably at least three, corners. See Figure 11.
    In addition, where the size and configuration of the drill bit allows, the geometries of the first and second annular grooves could be replaced with respect to the radial base surfaces shown in Figure 12. In this configuration, the short leg of the L-shaped protective ring 190 for the labyrinth seal / bearing is inserted into the second annular groove 194, formed in the surface 93, while the second long leg of the L-shaped protective ring 190 for the labyrinth seal / bearing would be inserted into the first annular groove 192, formed in the surface 91. 10 15 20 25 P162634.SE.01 11 We now refer to Figure 8, which illustrates a partially sectioned view of a roller drill bit showing an embodiment of an improved protective structure for a labyrinth seal / bearing. Identical reference numerals refer to identical or similar parts in Figures 1-7. The improved protective structure for a labyrinth seal / bearing in Figure 8 uses an flersegment L-shaped (in cross section) protective ring 290 for the labyrinth seal / bearing. Again, it will be appreciated that although the illustration is made for use with a sealed bearing, which includes the seal 60 in the stuffing box 64, the labyrinth seal 290 is equally useful in an open bearing (without seal) to introduce improved curvature 180. in the fluid path between the bearing 10 and the external environment 84. The presence of the stuffing box 64 and the seal 60 in Figure 8 is provided for illustrative purposes only and constitutes an optional structure used in the implementation of the sealed bearing. Although the illustration is made with a plain bearing, it will be appreciated that the labyrinth seal 290 protection ring / bearing is useful for protecting any type of bearing, including shaft journals and roller bearings.
    A first annular groove 192 is formed in a radial base surface 91 of the roller 3 (this radial base surface 91 forms a rear surface of the roller), the groove 192 including opposite side walls and a bottom. The first annular groove 192 is radially offset from the seal stuffing box through the surface 94 (i.e., the surface 94 separates a side wall of the groove 192 from the area of the sealing stuffing box 64, if present). The surface 94 may in one embodiment comprise a section of the radial base surface 91 (in other words, the surface 94 and the surface 91 lie in the same plane). In another embodiment, the surface 94 may comprise a surface defined by the formation of the first annular groove 192 itself (in other words, the surface 94 and the surface 91 are parallel, but do not lie in the same plane). In the alternative open bearing surface 94, the surface 94 is an offset separating a side wall of the groove 192 from the cylindrical bearing surface of the shaft 2. A second annular groove 194 is formed in a radial base surface 93 of the head 1 adjacent the shaft 2, this radial base surface 93 is opposed to the radial base surface 91 which forms a rear surface of the roller, the groove 194 including opposite side walls and a bottom. The second annular groove 194 is radially offset from the cylindrical sealing surface 62 by a section 193 of the radial base surface 93 (i.e., the surface 93 separates a side wall of the groove 194 from the shaft 2 and the sealing surface 62). The surface defined by section 193 thus lies, in a preferred implementation, in the same plane as the radial base surface 93. As an alternative, the surface defined by section 193 is produced by the formation of the other annular surface. the groove 194 (and is thus parallel to, but not in the same plane as, the surface 93). At least a portion of the second annular groove 194 is radially aligned with the first annular groove 192. In a preferred implementation, a side wall of the first annular groove 192 is radially aligned with a corresponding side wall of the second annular groove 194.
    The first and second annular grooves 192 and 194 together define an L-shaped (in cross-section) annular ring packing box, which accepts the L-shaped (in cross-section) protective ring 290 of the labyrinth seal / bearing. The fl-segment L-shaped protective ring 290 for the labyrinth seal / bearing is dimensioned and designed to conform to the annular opening in the ring packing box, but does not constitute a press-fit element and will actually exhibit some play around its periphery with respect to the annular ring packing box. The egersegment protection ring 290 for the labyrinth seal / bearing includes a first segment ring 292 and a second segment ring 294. The first segment ring 292 and the second segment ring 294 cooperate with each other at a complementary interface surface 296 (in this example, the interface surface 296 has a Z-shape). )). In combination, the first segment ring 292 and the second segment ring 294 define the L-shape (in cross section) of the labyrinth seal / bearing protective ring 290. A leg (e.g., the shorter leg) of the fl-segment L-shaped protective ring 290 for the labyrinth seal / bearing is inserted into the first annular groove 192. Another leg (e.g., the longer leg) of the fl-segment L-shaped protective ring 290 for the labyrinth seal / bearing is inserted in the second annular groove 194. The interface surface 296 is provided within said one second (longer) leg of the fl-segment L-shaped protective ring 290 for the labyrinth seal / bearing (although it could alternatively be provided within the other (shorter) leg). With the described geometry of the head and roller and the location of the fl-segment L-shaped protective ring 290 for the labyrinth seal / bearing, it should be noted that the eg-segment L-shaped protection ring 290 for the labyrinth seal / bearing is positioned between the roller 3 and the shaft 2 (so that it, in the implementation of the sealed layer, lies between the external environment and the seal, and it, in the implementation of the open layer, lies between the external environment and the layer). 10 15 20 25 30 P162634EN.01 13 We now also refer to Figures 9A and 9B, wherein Figure 9A illustrates the implementation of the sealed layer and Figure 9B illustrates the implementation of the open layer. The described geometry of the head and roller and the location of the L-shaped protective ring 290 of the labyrinth seal / bearing divides the path between the seal 60 (Figure 9A) and / or the bearing 10 (Figure 9B) and the outer environment 84 in a plurality of fluid paths. The dashed lines in Figures 9A and 9B generally illustrate the surfaces of the head, shaft and roller adjacent the cover 290 and the seal 60 / bearing 10. A first surface 300 extends around the surfaces of the first annular groove 192 (passing corners 195, 196, 197 and 198). A second 30 path 302 extends around the surfaces of the second annular groove 194 (passing corners 199, 200 and 201, and corners 207 in Figure 9B). A third fluid path 304 extends around a section of the first annular groove 192 (passing corners 195, 196, 197 and 198), passes through the interface surface 296 (passing corners 205, 204, 203, and 202), and extends around a section of the second annular groove 194 (passing corner 201). A fourth lane 306 extends around a section of the second annular groove 194 (passing corners 199 and 200), passes through the interface surface 296 (passing corners 202, 203, 204, and 205), and extends around a section of the first annular groove. track 194 (associated with surface 94). The first, second, third and fourth fluid paths 300, 302, 304 and 306 are parallel to each other with respect to passing around (and through) the L-shaped protective ring 290 of the labyrinth seal / bearing. Thus, this configuration not only divides the path between the seal 60 and the external environment 84 into its fluid paths (similar to the protection of the labyrinth seal / layer in Figure 6), but also ensures that each of the first, second, third and fourth paths 300 , 302, 304 and 306 present a curve 180 comprising at least two (and more preferably, än more than two) corners. The implementation in Figure 8 actually shows a curvature 180 with respect to the first 300 path 300 having four corners (195, 196, 197 and 198), a curve 180 with respect to the second 30 path 302 having at least three corners (199, 200 and 201, with a fourth corner 207 in Figure 9B), a curve 180 with respect to the third 30 path 304 having at least nine corners (195, 196, 197, 198, 205, 204, 203, 202 and 201, with a further corner 207 in Figure 9B), and a curve 180 with respect to the fourth 30 path 306 having six corners (199, 200, 202, 203, 204 and 205). 10 15 20 25 30 P162634EN.01 14 The fluid paths at each corner change the direction at a right angle to the curve.
    However, it should be noted that the angle of curvature could alternatively have a blunt (and perhaps pointed) angular configuration. Although the fl-segment L-shaped labyrinth seal / bearing protective ring 290 shown in Figure 8 includes two segments 292 and 294, it should be appreciated that the eg-segment L-shaped shield 290 for the labyrinth seal / bearing could alternatively be configured with more than two segments . The use of several segments can help to increase the division of the mellanway between the seal 60 and the external environment 84 into a plurality of flways, and further provide additional curves. Although a cross-sectional L-shaped protective ring 290 for the labyrinth seal / bearing is illustrated as a preferred implementation, it should be appreciated that the eg-segmented protective ring 290 for the labyrinth seal / bearing could have other cross-sectional shapes, including a T-shape, provide for a division of the id uidbanan into fl your parallel paths, each of which has a curvature, including at least two, and more preferably at least three, corners. In another implementation, the labyrinth seal / bearing protective ring 290 could instead have a bar-shaped (I-shaped) configuration in cross section, which would provide a division of the fluid path into your parallel paths, each having a curvature, including at least two , and more preferably at least three, corners.
    In addition, where the size and configuration of the drill bit allows, the geometries of the first and second annular grooves could be replaced with respect to the radial base surfaces (compare Figure 12). In this configuration, the short leg of the L-shaped protective ring 290 for the labyrinth seal / bearing would be inserted into the second annular groove 194 formed in the surface 93, while the other long leg of the L-shaped protective ring 290 for the labyrinth seal / bearing would be inserted into the first annular groove 192, formed in the surface 91.
    The L-shaped labyrinth seal / bearing protective ring (reference 190 or 290 above) is preferably made of stainless steel, to provide corrosion resistance, with a hardness comparable to materials used to form the head and / or roller, to provide for abrasion resistance.
    P162634.SE.01 Embodiments of the invention have been described and illustrated above. The invention is not limited to the disclosed embodiments.
    权利要求:
    Claims (33)
    [1]
    A drilling tool, comprising: a drilling head having a radially extending base surface; at least one bearing shaft extending from the drill head and having a bearing surface; a roller, mounted for rotation on the bearing shaft and having a radially extending base surface; a first annular groove formed in the radially extending base surface of the roller; a second annular groove formed in the radially extending base surface of the drill head, the first annular groove being aligned with at least a portion of the second annular groove; and a protective ring having a size and shape to fit between the roller and the drill head, positioned within both the first and second annular grooves.
    [2]
    The drilling tool of claim 1, wherein the shaft further includes a sealing surface, the drilling tool further comprising: a sealing packing box, formed between the roller and the bearing shaft; and a sealing element, arranged inside the sealing packing box.
    [3]
    Drilling tool according to claim 1, wherein the protective ring generally has an I-shape in cross section.
    [4]
    Drilling tool according to claim 1, wherein the protective ring generally has a T-shape in cross section.
    [5]
    Drilling tool according to claim 1, wherein the protective ring generally has an L-shape in cross section.
    [6]
    The drilling tool of claim 5, wherein the cross-sectional L-shaped protective ring has a first leg extending into the first annular groove and a second leg positioned between the roller and the drill head within the second annular groove.
    [7]
    The drilling tool of claim 6, wherein the cross-sectional L-shaped guard ring comprises a first ring segment defining at least a section of the first leg and a second ring segment defining at least a section of the second leg.
    [8]
    The drilling tool of claim 7, further comprising an interface surface between the first and second ring segments.
    [9]
    Drilling tool according to claim 8, wherein the interface surface has a Z-shape in cross section.
    [10]
    A drilling tool according to claim 1, wherein the protection ring, when installed in the first and second annular grooves, divides an fl path between the bearing shaft and an environment outside said drilling tool into a plurality of parallel fl paths passing at least around the protection ring.
    [11]
    The drilling tool of claim 10, wherein each of the plurality of parallel surfaces is provided with a curvature comprising at least two corners defined by the combination of the protective ring and at least one of the first and second annular grooves.
    [12]
    The drilling tool of claim 10, wherein each of the plurality of parallel surfaces is provided with a curvature comprising at least three corners defined by the combination of the protective ring and at least one of the first and second annular grooves.
    [13]
    A drilling tool according to claim 10, wherein a first of the plurality of parallel surfaces is provided with a curvature comprising at least three corners defined by the combination of the protective ring and at least one of the first and second annular grooves and all remaining of the plurality of parallel ban paths are provided with a curvature comprising at least four corners defined by the combination of the protective ring and at least one of the first and second annular grooves.
    [14]
    The drilling tool of claim 10, wherein the guard ring comprises a first ring segment and a second ring segment; further including an interface surface between the first and second ring segments; and wherein the guard ring, when installed in the first and second annular grooves, divides a path between the bearing shaft and an environment outside said drilling tool into a plurality of parallel paths passing both around the guard ring and between the first and second ring segments.
    [15]
    The drilling tool of claim 14, wherein each of the plurality of parallel surfaces is provided with a curvature comprising at least two corners defined by the combination of both of the first and second segments of the protective ring and at least one of the first and second annular grooves.
    [16]
    The drilling tool of claim 14, wherein each of the plurality of parallel surfaces is provided with a curvature comprising at least three corners defined by the combination of both of the first and second segments of the guard ring and at least one of the first and second annular grooves.
    [17]
    The drilling tool of claim 14, wherein a first of the plurality of parallel surfaces is provided with a curvature comprising at least three corners defined by the combination of both of the first and second segments of the guard ring and at least one of the first and second annular grooves and all remaining of the plurality of parallel fl paths are provided with a curvature comprising at least four corners defined by the combination of both of the first and second segments of the protective ring and at least one of the first and second annular grooves. 10 15 20 25 30 P162634.SE.01 4
    [18]
    The drilling tool of claim 17, wherein at least one of the remaining plurality of fl surfaces passes through the interface surface between the first and second ring segments.
    [19]
    A drilling tool according to claim 10, wherein each of the plurality of parallel surfaces is provided with a curvature comprising a plurality of corners defined by the shape of the protective ring and an annular stuffing box formed by the first and second annular grooves.
    [20]
    A drilling tool according to claim 19, wherein the fl surface changes direction at each corner at a right angle.
    [21]
    The drilling tool of claim 1, wherein the second annular groove formed in the radially extending base surface of the drill head is offset from the bearing shaft by a section of the radially extending base surface of the drill head.
    [22]
    The drilling tool of claim 1, wherein the first annular groove formed in the radially extending base surface of the roller is offset from the bearing shaft by a section of the radially extending base surface of the roller.
    [23]
    The drilling tool of claim 1, wherein the bearing shaft supports a plain bearing for rotating the roller.
    [24]
    A drilling tool, comprising: a roller mounted for rotation on a bearing shaft extending from a drill head, the roller having a first radially extending planar base surface opposite a second radially extending planar base surface of the drill head; a first annular groove formed in the first radially extending planar base surface; a second annular groove formed in the second radially extending planar base surface, the first annular groove being aligned with at least one section of the second annular groove, the combination of the first and second annular grooves form a first annular stuffing box; and a protective ring inserted into the first annular stuffing box.
    [25]
    A drilling tool comprising according to claim 24, a further sliding sealing system provided between the roller and the bearing shaft.
    [26]
    Drilling tool according to claim 25, wherein the sliding sealing system comprises a second annular stuffing box, formed between the roller and the bearing shaft, and a sealing element in the form of an O-ring which is retained inside the second annular stuffing box.
    [27]
    The drilling tool of claim 24, wherein the first annular stuffing box has an L-shape in cross section and the protective ring has a corresponding L-shape in cross section.
    [28]
    The drilling tool of claim 24, wherein the guard ring comprises a first ring segment and a second ring segment and further includes an interface surface between the first and second ring segments.
    [29]
    The drilling tool of claim 24, wherein the protection ring, when installed in the first annular stuffing box, divides an fl path between the bearing shaft and an environment outside said drilling tool into a plurality of parallel fluid paths passing around the protection ring.
    [30]
    The drilling tool of claim 29, wherein each of the plurality of parallel surfaces is provided with a curvature comprising at least two corners defined by the shape of the protective ring and the first annular stuffing box.
    [31]
    The drilling tool of claim 29, wherein each of the plurality of parallel surfaces is provided with a curvature comprising at least three corners defined by the shape of the protective ring and the first annular stuffing box. 10 15 20 P162634.SE.01
    [32]
    A drilling tool according to claim 29, wherein each of the plurality of parallel fl surfaces is provided with a curvature comprising a plurality of corners defined by the shape of the protective ring and an annular stuffing box formed by the first and second annular grooves, and wherein the fl surface changes direction at each corner at a right angle.
    [33]
    A drilling tool, comprising: a roller mounted for rotation on a bearing shaft extending from a drill head, the roller having a first radially extending planar base surface opposite a second radially extending planar base surface of the drill head; a first annular groove formed in the first radially extending planar base surface, the first annular groove having first and second opposite side walls; a second annular groove formed in the second radially extending planar base surface, the second annular groove having first and second opposing side walls, the first side wall of the first annular groove being radially aligned with the first side wall of the second annular groove, wherein the combination of the first and second annular grooves forms a first annular stuffing box; and a protective ring inserted into the first annular stuffing box.
    类似技术:
    公开号 | 公开日 | 专利标题
    SE1351507A1|2013-12-16|Rock drill bit that has a protective structure for a maze seal / bearing
    US9951817B2|2018-04-24|Integral oil damper and jet for lubrication of bearings and seals
    US7117961B2|2006-10-10|Dynamic seal with soft interface
    BRPI0803570B1|2020-08-25|seal assembly to seal an axle
    US8783385B2|2014-07-22|Rock bit having a mechanical seal with superior thermal performance
    US7188691B2|2007-03-13|Metal seal with impact-absorbing ring
    JP5876079B2|2016-03-02|Drill tool to reduce lubricant pressure pulsations in rotary cone rock bits
    US20060065445A1|2006-03-30|Rock-bit seals with asymmetric contact profiles
    US6619664B1|2003-09-16|Wear improvement to textured lip seal
    US20130319770A1|2013-12-05|Drill bit seal and method of using same
    RU2372467C1|2009-11-10|Device for drilling of slant boreholes
    JP5876080B2|2016-03-02|Apparatus for reducing lubricant pressure pulsations in a rotary cone rock bit
    EP3048344A2|2016-07-27|Seal housing pre-taper
    CA2019460A1|1991-01-19|Rotary drill bits
    US20190178037A1|2019-06-13|Sealing arrangement
    CN102284865A|2011-12-21|Static pressure guide rail with pressure reducing oil grooves
    US20100072708A1|2010-03-25|Seal assembly
    SE534450C2|2011-08-30|Device and method for protecting a rock drill against corrosion attack
    CN103470768B|2015-12-02|A kind of carbon ring seal
    US20200166140A1|2020-05-28|Seal assembly with anti-rotation and stability features
    RU2570724C1|2015-12-10|Rolling drilling bit
    CN107575582A|2018-01-12|A kind of float grease seal
    JP2008157153A|2008-07-10|Gas seal device for high speed rotation apparatus
    JP2008175255A|2008-07-31|Rotary cutter rock bit device
    同族专利:
    公开号 | 公开日
    US8752655B2|2014-06-17|
    AU2012284583B2|2016-12-15|
    RU2576421C2|2016-03-10|
    CN103717824A|2014-04-09|
    CA2836610C|2018-01-02|
    ZA201309741B|2014-08-27|
    RU2012125096A|2014-01-20|
    CA2836610A1|2013-01-24|
    EP2734700A4|2016-01-20|
    CN103717824B|2016-03-30|
    SE539231C2|2017-05-23|
    AU2012284583C1|2017-04-06|
    WO2013012471A1|2013-01-24|
    EP2734700A1|2014-05-28|
    US20130020135A1|2013-01-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3489421A|1967-03-23|1970-01-13|Smith International|Bearing seal|
    US3656764A|1970-08-31|1972-04-18|William P Robinson|Drill bit seal assembly|
    SU859588A1|1973-01-02|1984-04-30|Донецкий Филиал Научно-Исследовательского Горнорудного Института|Single bit chisel|
    US4102419A|1976-05-10|1978-07-25|Klima Frank J|Rolling cutter drill bit with annular seal rings|
    US4200343A|1978-12-21|1980-04-29|Dresser Industries, Inc.|Sealing system for a rotary rock bit|
    US4179003A|1978-12-21|1979-12-18|Dresser Industries, Inc.|Seal for a rolling cone cutter earth boring bit|
    US4209890A|1979-01-19|1980-07-01|Dresser Industries, Inc.|Method of making a rotary rock bit with seal recess washer|
    US4494749A|1980-05-27|1985-01-22|Evans Robert F|Seal assemblies|
    US4613004A|1985-11-06|1986-09-23|Hughes Tool Company - Usa|Earth boring bit with labyrinth seal protector|
    SE8801233L|1988-04-05|1989-10-06|Sandvik Ab|Rotary drill bit|
    US5027911A|1989-11-02|1991-07-02|Dresser Industries, Inc.|Double seal with lubricant gap between seals for sealed rotary drill bits|
    US5224560A|1990-10-30|1993-07-06|Modular Engineering|Modular drill bit|
    US5513715A|1994-08-31|1996-05-07|Dresser Industries, Inc.|Flat seal for a roller cone rock bit|
    US5513711A|1994-08-31|1996-05-07|Williams; Mark E.|Sealed and lubricated rotary cone drill bit having improved seal protection|
    US5570750A|1995-04-20|1996-11-05|Dresser Industries, Inc.|Rotary drill bit with improved shirttail and seal protection|
    US6264367B1|1995-12-19|2001-07-24|Smith International, Inc.|Dual-seal drill bit with fluid cleaning capability|
    US6254275B1|1995-12-19|2001-07-03|Smith International, Inc.|Sealed bearing drill bit with dual-seal configuration and fluid-cleaning capability|
    US5740871A|1996-05-01|1998-04-21|Dresser Industries, Inc.|Flow diverter ring for a rotary drill bit and method|
    US6336512B1|1999-02-02|2002-01-08|Smith International, Inc.|Drill bit having canted seal|
    US7721827B2|2007-08-17|2010-05-25|Varel International Ind., L.P.|Rock bit having a seal gland with a conical sealing surface|
    US7798248B2|2008-08-18|2010-09-21|Baker Hughes Incorporated|Roller bearing seal companion ring having textured surface for holding lubricant and small particles|US9091130B2|2013-02-13|2015-07-28|Varel International, Ind., L.P.|Rock bit having a radially self-aligning metal faced seal|
    US9163458B2|2013-02-13|2015-10-20|Varel International, Ind., L.P.|Rock bit having a flexible metal faced seal|
    US9163459B2|2013-02-13|2015-10-20|Varel International, Ind., L.P.|Rock bit having a pressure balanced metal faced seal|
    WO2017200552A1|2016-05-20|2017-11-23|Halliburton Energy Services, Inc.|Sealing elements for roller cone bits|
    CN108533178A|2018-04-03|2018-09-14|西南石油大学|Rock bit tooth form sealing structure|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US13/185,345|US8752655B2|2011-07-18|2011-07-18|Rock bit having a labyrinth seal/bearing protection structure|
    PCT/US2012/037553|WO2013012471A1|2011-07-18|2012-05-11|Rock bit having a labyrinth seal/bearing protection structure|
    [返回顶部]