CN114658936A - High-pressure movable elbow based on four-point contact theory - Google Patents
High-pressure movable elbow based on four-point contact theory Download PDFInfo
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- CN114658936A CN114658936A CN202210394773.7A CN202210394773A CN114658936A CN 114658936 A CN114658936 A CN 114658936A CN 202210394773 A CN202210394773 A CN 202210394773A CN 114658936 A CN114658936 A CN 114658936A
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- ring
- rolling groove
- elbow
- female joint
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- 238000005096 rolling process Methods 0.000 claims abstract description 119
- 239000004579 marble Substances 0.000 claims abstract description 46
- 238000012856 packing Methods 0.000 claims abstract description 38
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 239000000428 dust Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 5
- 238000005457 optimization Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L27/00—Adjustable joints, Joints allowing movement
- F16L27/08—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe
- F16L27/0804—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another
- F16L27/0808—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation
- F16L27/0824—Adjustable joints, Joints allowing movement allowing adjustment or movement only about the axis of one pipe the fluid passing axially from one joint element to another the joint elements extending coaxially for some distance from their point of separation with ball or roller bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pivots And Pivotal Connections (AREA)
Abstract
The invention provides a high-pressure movable elbow based on a four-point contact theory. The bearing ball bearing device comprises a male connector and a female connector, wherein the male connector is inserted into the female connector, a plurality of bearing balls are arranged between the male connector and the female connector, and a plurality of rolling grooves for the bearing balls to be embedded and roll are axially arranged on the contact surfaces of the male connector and the female connector; the curvature radius of the outer semi-annular rolling groove and the curvature radius of the inner semi-annular rolling groove are larger than that of the bearing marble. According to the invention, through the optimization design of the trajectory, the stress state of the elbow is improved, and the curvature radius of the outer semi-annular rolling groove and the curvature radius of the inner semi-annular rolling groove are larger than that of the bearing marble, the bearing marble and the rolling grooves are in four-point contact at the same section, so that the contact area of the marble and the trajectory is increased, the contact stress of the marble and the trajectory is reduced, the influence of pulse impact on packing sealing is reduced, the problem of failure and leakage of the packing caused by vibration pulse is thoroughly solved, and the service life of the movable elbow is prolonged.
Description
Technical Field
The invention relates to the technical field of movable elbows, in particular to a high-pressure movable elbow based on a four-point contact theory.
Background
At present, the high-pressure movable elbow is an essential part for connecting a high-pressure manifold in the construction process of an oil well and a gas well. The connection of the movable elbow can realize the connection of the equipment and the wellhead in any direction. However, the high-pressure movable elbow has the following defects in the use process for a long time: poor sealing at the interface at low pressure, liquid leakage, overlarge contact stress of a marble trajectory, easy indentation, easy blocking, short service life and the like.
Disclosure of Invention
The invention provides a high-pressure movable elbow based on a four-point contact theory through the optimization design of the elbow trajectory, which is used for improving the stress state of the elbow and reducing the contact stress between a marble and the trajectory, thereby prolonging the service life of the elbow. The specific scheme is as follows:
a high-pressure movable elbow based on a four-point contact theory comprises a female joint and a male joint, wherein the male joint connecting end of the elbow is connected with the adjacent female joint connecting end, the female joint connecting end of the elbow is connected with the male joint connecting end of another adjacent elbow, a plurality of bearing marbles are arranged between the male joint and the female joint, a plurality of rolling grooves for the bearing marbles to be embedded and arranged to roll are axially arranged on the contact surface of the male joint and the female joint,
the rolling grooves are arranged in a stepped manner along the axial direction, and the axial sections of the rolling grooves are symmetrically provided with outer semi-annular rolling grooves and inner semi-annular rolling grooves;
the outer semi-annular rolling groove is formed in the outer side of the connecting end of the male connector;
the inner semi-annular rolling groove is arranged at the position corresponding to the outer semi-annular rolling groove on the inner side of the connecting end of the female joint;
the outer semi-annular rolling groove and the inner semi-annular rolling groove respectively comprise two sections of arcs arranged in a mirror image mode, the curvature radius of each arc is larger than that of the bearing marble, the circle centers of the four sections of arcs are not overlapped, and the original contact angle a between the four sections of arcs and the bearing marble is 45-60 degrees.
Further, the difference of the central diameters of the adjacent inner semi-ring-shaped rolling grooves or the adjacent outer semi-ring-shaped rolling grooves is equal to the diameter of the bearing marble.
Furthermore, a plurality of positioning holes for bearing balls are arranged at the joint of the inner semi-ring rolling groove and the outer semi-ring rolling groove at intervals,
the mounting holes are arranged along the circumferential direction of the inner semi-ring-shaped rolling groove/the outer semi-ring-shaped rolling groove;
the bearing marble is positioned in the positioning hole.
Further, the trajectories include a first trajectory, a second trajectory, and a third trajectory,
the distances from the first trajectory, the second trajectory and the third trajectory to the axis of the elbow are linearly increased or decreased from inside to outside in an axial direction.
Furthermore, one side of the inner semi-annular rolling groove far away from the end part of the female joint is provided with a sealing packing,
the sealing packing is located one side that female joint tip was kept away from to interior semi-annular rolling groove is provided with sealing packing, sealing packing one side and female joint butt, sealing packing opposite side and male joint butt.
Furthermore, the female joint is provided with a pressure relief hole in the radial direction,
the pressure relief hole is located between the sealing packing and the first inner semi-ring type rolling groove.
Furthermore, an edge dust ring is arranged between the male joint and the female joint,
the edge portion dust ring is sleeved outside the male connector and is abutted against the inner side of the female connector, and the edge portion dust ring is located on one side, away from the female connector, of the third outer semi-ring-shaped rolling groove.
Furthermore, an oil injection screw and a ball plug hole are radially arranged on the female joint,
the oil injection screw and the ball plug hole are arranged at intervals;
the oil injection screw is positioned between the inner semi-ring-shaped rolling groove at the connecting end part far away from the female joint and the inner semi-ring-shaped groove adjacent to the inner semi-ring-shaped rolling groove;
the ball plug hole is communicated with each inner semi-ring-shaped rolling groove.
Further, the female joint comprises a straight female joint and a female joint end of the AB elbow, and the male joint comprises a straight male joint and a male joint end of the AB elbow;
the male joint end of the straight male joint 1/AB elbow is inserted into the female joint end of the straight female joint or the bent AB elbow;
the end, far away from the trajectory, of the straight female joint is connected with an union nut;
a positioning retainer ring is arranged between the union nut and the straight female joint;
the positioning retainer ring extends out of the union nut towards one end part of the straight female joint, and a clamp spring is radially arranged on the positioning retainer ring and is positioned outside the union nut.
Furthermore, the ball for weighing is a spherical steel ball.
The invention has the beneficial effects that:
the invention improves the stress state of the elbow by the optimized design of the trajectory, in particular to a method for improving the stress state of the elbow, which comprises the steps of arranging a bearing marble in the trajectory, and designing the trajectory into an arc-shaped rolling groove, wherein the rolling groove comprises an outer semi-annular rolling groove and an inner semi-annular rolling groove which are symmetrically arranged by taking the center as a reference, the curvature radius of the outer semi-annular rolling groove and the curvature radius of the inner semi-annular rolling groove are both larger than that of the bearing marble, the bearing marble and the rolling groove are changed into a four-point contact structure by arranging the curvature roller paths with non-coincident circle centers at two ends on the inner annular rolling groove and the outer annular rolling groove, and a stable original contact angle which is less influenced by a radial gap can be formed between the bearing marble and the rolling groove, when the elastic ball is subjected to axial action, the contact stress between the marble and a trajectory can be reduced, so that the influence of pulse impact on packing sealing in the use process is reduced, the problem of failure and leakage of the packing caused by vibration pulse is thoroughly solved, and the service life of the movable elbow is prolonged;
meanwhile, the bearing balls are matched with all paths of trajectories of the elbow, and the bearing balls mainly play roles in connecting the elbow, bearing axial force generated by fluid pressure in the elbow, axially positioning a straight female joint, an AB joint and a straight male joint, ensuring the precompression amount of packing, ensuring the positioning accuracy of an elbow moving part, enabling all connecting pieces to freely rotate during working and the like;
the dust ring is arranged to prevent the elbow trajectory cavity from contacting with the outside, so that the elbow is prevented from being blocked due to foreign matters entering the elbow trajectory;
by arranging the sealing packing and arranging the sealing packing as the elastic part, a certain pre-compression amount is axially reserved during dark rotation, so that the effect of sealing high-pressure fluid is realized when the high-pressure fluid is in the elbow;
the pressure relief hole is formed in the trajectory part of the female joint, so that high-pressure fluid is prevented from rushing into the trajectory when the sealing packing fails, and the trajectory structure is prevented from being damaged;
set up the sealing washer between sealed packing and trajectory for the outside contact in separation elbow trajectory chamber, when avoiding the trajectory to advance the foreign matter and lead to the elbow card dead, still avoided when the seepage appears in the packing, the liquid that the elbow was carried gets into packing trajectory chamber.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is an assembly view of a high-pressure movable elbow based on the four-point contact theory in the embodiment of the present invention;
FIG. 2 is a schematic structural view of a ballistic trajectory in an embodiment of the present invention;
FIG. 3 is a schematic structural view of the movable joint of the elbow;
FIG. 4 is an enlarged view taken at A in FIG. 3;
FIG. 5 is a schematic view of a contact of a marble with a ballistic surface;
FIG. 6 is a prior art single arc trajectory;
wherein, 1-male joint, 2-AB elbow, 3-bearing marble, 4-external dust ring, 5-, 6-sealing packing, 7-snap spring, 8-retainer ring, 9-union nut, 10-female joint, 11-oiling screw, 12-ball plug hole, 13-pressure relief hole 13, 14-first trajectory, 15-second trajectory, 16-third trajectory,
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
According to the high-pressure movable elbow based on the four-point contact theory shown in the attached figures 1-6, the elbow comprises a female joint and a male joint, the male joint connecting end of the elbow is connected with the adjacent female joint connecting end, the female joint connecting end of the elbow is connected with the male joint connecting end of another adjacent elbow, a plurality of bearing marbles 3 are arranged between the male joint and the female joint, a plurality of rolling grooves for the bearing marbles 3 to be embedded and rolled are axially arranged on the contact surface of the male joint and the female joint,
the rolling grooves are arranged in a stepped manner along the axial direction, and the axial sections of the rolling grooves are symmetrically provided with outer semi-annular rolling grooves and inner semi-annular rolling grooves;
the outer semi-annular rolling groove is formed in the outer side of the connecting end of the male connector;
the inner semi-annular rolling groove is arranged at the position corresponding to the outer semi-annular rolling groove on the inner side of the connecting end of the female joint;
the outer semi-annular rolling groove and the inner semi-annular rolling groove respectively comprise two sections of arcs arranged in a mirror image mode, the curvature radius of each arc is larger than that of the bearing marble 3, the circle centers of the four sections of arcs are not overlapped, and the original contact angle a between the four sections of arcs and the bearing marble 3 is 45-60 degrees.
It should be noted that an included angle between the two contact points of the bearing marble 3 and the outer semi-annular rolling groove or between the two contact points of the bearing marble 3 and the inner semi-annular rolling groove and a connecting line from the ball center is an original contact angle;
the inner semi-ring-shaped rolling groove comprises a first arc line and a second arc line on the cross section, the curvature radius of the first arc line and the curvature radius of the second arc line are larger than that of the bearing marble 3, the bearing marble 3 is respectively in contact with the first arc line and the inner contact point of the second arc line, the cross section of the outer semi-ring-shaped rolling groove comprises a third arc line and a fourth arc line, the curvature radius of the third arc line and the curvature radius of the fourth arc line are larger than that of the bearing marble 3, the bearing marble 3 is respectively in contact with the inner contact point of the third arc line and the inner contact point of the fourth arc line, on the same axial cross section, the rolling groove is on the same axial cross section, and the contact points of the first arc line, the second arc line, the third arc line and the fourth arc line and the bearing marble 3 can be connected into a rectangle.
In one embodiment of the invention, the difference between the central diameters of the adjacent inner semi-ring type rolling grooves or the adjacent outer semi-ring type rolling grooves is equal to the diameter of the bearing marble 3.
It should be noted that, taking an elbow of 3-105 models as an example, the designed pressure-bearing capacity is 105MPa, the elbow needs to be pressed to 150MPa (1.5 times of nominal pressure) during factory pressing test, at this time, three trajectories at the movable connection part of the elbow need to bear axial load of nearly 600kN as shown in fig. 3, the existing elbow trajectories all adopt single-arc fit as shown in fig. 6, when the radial clearance of the inner and outer two fit trajectories is small, the contact angle between the marble and the trajectory is small (the theoretical contact angle is 0 degree under 0 clearance after the steel ball 3 is loaded), large axial force is hard to bear, and the seizure phenomenon during elbow use is easily caused, when the radial clearance is large, a large contact angle can be formed, but the sealing effect of the packing is affected due to the existence of the radial clearance, and leakage easily occurs in sealing;
the invention designs a circular-arc trajectory, namely, the sections of an inner semi-ring-shaped rolling groove and an outer semi-ring-shaped rolling groove which form the trajectory are both semicircular, the inner semi-ring-shaped rolling groove and the outer semi-ring-shaped rolling groove are matched and installed together to form a trajectory with a circular cross section, a bearing marble 3 is arranged in the trajectory, the bearing marble 3 is a spherical steel ball, the spherical steel ball and the circular-arc trajectory are matched to form a four-point contact effect shown in figure 5, as shown in figure 6, the contact angle a of the bearing marble 3 and the trajectory surface is larger than that of the existing single circular-arc trajectory, the contact angle a of the patent is smaller, the contact angle a is less influenced by radial clearance error, the contact area of the bearing marble 3 and the trajectory is increased from the design, so that the contact stress of the bearing marble 3 and the trajectory is reduced, and meanwhile, the structure of the invention does not need to intentionally increase the radial clearance to cause inaccurate positioning and the poor positioning, And (5) leakage of packing and the like.
In one embodiment of the invention, the joint of the inner semi-ring-shaped rolling groove and the outer semi-ring-shaped rolling groove is provided with a plurality of positioning holes for bearing balls 3 at intervals,
the mounting holes are arranged along the circumferential direction of the inner semi-ring-shaped rolling groove/the outer semi-ring-shaped rolling groove;
the bearing marble 3 is positioned in the positioning hole.
In one embodiment of the invention, the trajectories include a first trajectory 14, a second trajectory 15 and a third trajectory 16,
the distances from the first ballistic trajectory 14, the second ballistic trajectory 15 and the third ballistic trajectory 16 to the elbow axis are linearly increased or decreased from inside to outside in an axial direction.
It should be noted that the first trajectory 14, the second trajectory 15, and the third trajectory 16 include a first inner half-ring rolling groove, a first outer half-ring rolling groove, a second inner half-ring rolling groove, a second outer half-ring rolling groove, a third inner half-ring rolling groove, and a third outer half-ring rolling groove, which are correspondingly arranged, and the first inner half-ring rolling groove, the second inner half-ring rolling groove, and the third inner half-ring rolling groove are sequentially arranged in an increasing manner from the inner diameter to the outer diameter along the circumferential direction of the box;
the first outer semi-ring rolling groove, the second outer semi-ring rolling groove and the third outer semi-ring rolling groove are sequentially and progressively reduced in diameter from inside to outside in the axial direction of the male connector.
In one embodiment of the invention, one side of the inner semi-annular rolling groove far away from the end part of the female joint is provided with a sealing packing 6,
the sealing packing 6 is located one side of the inner semi-annular rolling groove far away from the end part of the female joint is provided with the sealing packing 6, one side of the sealing packing 6 is abutted against the female joint, and the other side of the sealing packing 6 is abutted against the male joint.
It should be noted that, the inner semi-annular rolling groove herein refers to an inner semi-annular rolling groove at the innermost of the female joint, that is, a first inner semi-annular rolling groove, an annular groove is formed in an inner wall of the first inner semi-annular rolling groove on a side away from the female joint connection end, and the seal packing 6 is located in the annular groove.
In one embodiment of the invention, the female joint is provided with a pressure relief hole 13 in the radial direction,
the pressure relief hole 13 is located between the sealing packing 6 and the first inner semi-ring type rolling groove.
In one embodiment of the invention, an edge dust ring 4 is arranged between the male connector and the female connector,
the edge portion dust ring 4 is sleeved outside the male connector, the edge portion dust ring 4 is abutted to the inner side of the female connector, and the edge portion dust ring 4 is located on one side, away from the female connector, of the third outer semi-ring-shaped rolling groove.
In one embodiment of the invention, the female joint is provided with an oiling screw 11 and a ball plug hole 12 in the radial direction,
the oiling screw 11 and the ball plug hole 12 are arranged at intervals;
the oil injection screw 11 is positioned between the inner semi-ring-shaped rolling groove at the end part far away from the female joint connection end and the inner semi-ring-shaped rolling groove adjacent to the inner semi-ring-shaped rolling groove;
the ball plug hole 12 is communicated with each inner semi-ring-shaped rolling groove.
In one embodiment of the invention, the female connector comprises a female connector end of a straight female connector 1 and an AB elbow 2, and the male connector comprises a male connector end of a straight male connector 1 and an AB elbow 2;
the male joint end of the straight male joint 1/AB elbow 2 is inserted into the female joint end of the straight female joint 10 or the bent AB elbow 2;
the end, far away from the ballistic path, of the straight female joint 10 is connected with an union nut 9;
a positioning retainer ring 8 is arranged between the union nut 9 and the straight female joint;
the positioning retainer ring 8 extends out of the union nut 9 towards one end part of the straight female joint 10, the clamping spring 7 is radially arranged on the positioning retainer ring 8, and the clamping spring 7 is located outside the union nut 9.
In one embodiment of the present invention, the bearing marble 3 is a spherical steel ball.
It should be noted that the diameter of the trajectory is larger than that of the bearing marble 3, the bearing marble 3 is in transition fit with the trajectory, the bearing marble 3 can also be other high-strength spherical metals, and the bearing marble 3 is arranged and is a steel ball due to the comprehensive consideration of mechanical strength and cost; the female joint, the male joint and the positioning retainer ring 8 are standard parts in the industry; the sealing packing 6 can also be other elastic packing, and the sealing packing 6 is a rubber sealing packing; the outer dustproof ring 4 is a rubber dustproof ring;
the male joint, the female joint and the AB elbow can be assembled and used at will, and the installation process of the invention is as follows:
firstly, placing a sealing packing 6 into the end part of the movable connecting end of the male joint/AB elbow, and sleeving a sealing ring 5 on one side, close to the end part of the movable connecting end, of a third outer semi-ring type rolling groove of the male joint/AB elbow; sleeving an edge dustproof ring 4 on one side of the first outer semi-ring type rolling groove far away from the end part of the movable connecting end;
then inserting the male joint of the male joint/AB elbow into the female joint of the female joint/AB elbow, and correspondingly matching and installing the first outer semi-ring rolling groove, the second outer semi-ring rolling groove and the third outer semi-ring rolling groove with the first inner semi-ring rolling groove, the second inner semi-ring rolling groove and the third inner semi-ring rolling groove;
finally, filling the bearing marble 3 into each trajectory in sequence through the ball plug hole 12, and paying attention to the difference of the quantity of the steel balls 3 loaded in the adjacent trajectories by one;
and finally, fixing the male joint and the female joint through an oiling screw 11.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A high-pressure movable elbow based on a four-point contact theory comprises a female joint and a male joint and is characterized in that the male joint connecting end of the elbow is connected with the adjacent female joint connecting end, the female joint connecting end of the elbow is connected with the male joint connecting end of another adjacent elbow, a plurality of bearing marbles (3) are arranged between the male joint and the female joint, a plurality of rolling grooves for the bearing marbles (3) to be embedded and arranged to roll are axially arranged on the contact surface of the male joint and the female joint,
the rolling grooves are arranged along the axial direction in a step shape, and the axial sections of the rolling grooves are symmetrically provided with outer semi-annular rolling grooves and inner semi-annular rolling grooves;
the outer semi-annular rolling groove is formed in the outer side of the connecting end of the male connector;
the inner semi-annular rolling groove is arranged at the position corresponding to the outer semi-annular rolling groove on the inner side of the connecting end of the female joint;
the outer semi-annular rolling groove and the inner semi-annular rolling groove respectively comprise two arcs arranged in a mirror image mode, the curvature radius of each arc is larger than that of the bearing marble (3), the circle centers of the four arcs are not overlapped, and the original contact angle a between each arc and the bearing marble (3) ranges from 45 degrees to 60 degrees.
2. The high-pressure movable elbow based on the four-point contact theory as claimed in claim 1, wherein the difference of the central diameters of the adjacent inner half-ring rolling grooves or the adjacent outer half-ring rolling grooves is equal to the diameter of the bearing marble (3).
3. The high-pressure movable elbow based on the four-point contact theory as claimed in claim 2, wherein the joint of the inner semi-ring-shaped rolling groove and the outer semi-ring-shaped rolling groove is provided with a plurality of positioning holes for bearing balls (3) at intervals,
the mounting holes are arranged along the circumferential direction of the inner semi-ring-shaped rolling groove/the outer semi-ring-shaped rolling groove;
the bearing marble (3) is positioned in the positioning hole.
4. A high-pressure moving elbow based on four-point contact theory according to claim 2, characterized in that the ballistic trajectories comprise a first ballistic trajectory (14), a second ballistic trajectory (15) and a third ballistic trajectory (16),
the distances from the first trajectory (14), the second trajectory (15) and the third trajectory (16) to the axis of the elbow are linearly increased or decreased from inside to outside in an axial direction.
5. The high-pressure movable elbow based on the four-point contact theory as claimed in claim 4, characterized in that one side of the inner semi-annular rolling groove far away from the end of the female joint is provided with a sealing packing (6),
the sealing packing (6) is located one side of the inner semi-annular rolling groove far away from the end part of the female joint is provided with the sealing packing (6), one side of the sealing packing (6) is abutted against the female joint, and the other side of the sealing packing (6) is abutted against the male joint.
6. The high-pressure movable elbow based on the four-point contact theory as claimed in claim 4, wherein the female joint is provided with a pressure relief hole (13) in the radial direction,
the pressure relief hole (13) is located between the sealing packing (6) and the first inner semi-ring type rolling groove.
7. The high-pressure movable elbow based on the four-point contact theory as claimed in claim 4, wherein an edge dust ring (4) is arranged between the male joint and the female joint,
the edge dust ring (4) is sleeved outside the male connector, the edge dust ring (4) is abutted against the inner side of the female connector, and the edge dust ring (4) is located on one side, away from the female connector, of the third outer semi-ring-shaped rolling groove.
8. The high-pressure movable elbow based on the four-point contact theory as claimed in claim 1, wherein the female joint is provided with an oil injection screw (11) and a ball plug hole (12) in a radial direction,
the oiling screw (11) and the ball plug hole (12) are arranged at intervals;
the oil injection screw (11) is positioned between an inner semi-ring-shaped rolling groove at the end part far away from the female joint and an inner semi-ring-shaped groove adjacent to the inner semi-ring-shaped rolling groove;
the ball plug hole (12) is communicated with each inner semi-ring-shaped rolling groove.
9. The high-pressure movable elbow based on the four-point contact theory as claimed in claim 1, wherein the female joint comprises a female joint end of a straight female joint (10) and an AB elbow (2), and the male joint comprises a male joint end of a straight male joint (1) and an AB elbow (2);
the male joint end of the straight male joint 1/AB elbow (2) is inserted into the female joint end of the straight female joint (10) or the bent AB elbow (2);
the end, far away from the trajectory, of the straight female joint (10) is connected with an union nut (9);
be provided with location retaining ring (8) between oil union nut (9) and the straight female joint, location retaining ring (8) orientation straight female joint (10) one end part stretches out outside oil union nut (9), location retaining ring (8) radially are provided with jump ring (7), jump ring (7) are located outside oil union nut (9).
10. The high-pressure movable elbow based on the four-point contact theory as claimed in claim 1, wherein the bearing marble (3) is a spherical steel ball.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210394773.7A CN114658936A (en) | 2022-04-14 | 2022-04-14 | High-pressure movable elbow based on four-point contact theory |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210394773.7A CN114658936A (en) | 2022-04-14 | 2022-04-14 | High-pressure movable elbow based on four-point contact theory |
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| Publication Number | Publication Date |
|---|---|
| CN114658936A true CN114658936A (en) | 2022-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210394773.7A Pending CN114658936A (en) | 2022-04-14 | 2022-04-14 | High-pressure movable elbow based on four-point contact theory |
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| CN2201513Y (en) * | 1994-06-21 | 1995-06-21 | 青岛轴承厂 | Four-point contact thrust ball bearing |
| CN1150836A (en) * | 1994-06-15 | 1997-05-28 | Fmc有限公司 | Step bearing race swivel joint assembly |
| CN101450675A (en) * | 2007-12-03 | 2009-06-10 | 万都株式会社 | Slip joint of steering apparatus for vehicle |
| CN102829038A (en) * | 2011-06-16 | 2012-12-19 | 沃恩阿克斯公开股份有限公司 | Quick-connect coupling |
| CN103712015A (en) * | 2013-12-27 | 2014-04-09 | 大连瑞谷科技有限公司 | Four-point thrust angular contact type rotating joint |
| KR101390278B1 (en) * | 2012-11-16 | 2014-04-29 | 삼성중공업 주식회사 | Ball bearing and wind power generator including the same |
| CN206513987U (en) * | 2017-02-09 | 2017-09-22 | 长江大学 | A kind of movable elbow with multistage track groove |
| CN113389958A (en) * | 2021-06-22 | 2021-09-14 | 江苏瑞亿石油机械有限公司 | High-pressure movable elbow |
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2022
- 2022-04-14 CN CN202210394773.7A patent/CN114658936A/en active Pending
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| CN2046161U (en) * | 1988-11-24 | 1989-10-18 | 赵硕颀 | Dual point contact between ball and rolling track type rolling bearing |
| CN1150836A (en) * | 1994-06-15 | 1997-05-28 | Fmc有限公司 | Step bearing race swivel joint assembly |
| CN2201513Y (en) * | 1994-06-21 | 1995-06-21 | 青岛轴承厂 | Four-point contact thrust ball bearing |
| CN101450675A (en) * | 2007-12-03 | 2009-06-10 | 万都株式会社 | Slip joint of steering apparatus for vehicle |
| CN102829038A (en) * | 2011-06-16 | 2012-12-19 | 沃恩阿克斯公开股份有限公司 | Quick-connect coupling |
| KR101390278B1 (en) * | 2012-11-16 | 2014-04-29 | 삼성중공업 주식회사 | Ball bearing and wind power generator including the same |
| CN103712015A (en) * | 2013-12-27 | 2014-04-09 | 大连瑞谷科技有限公司 | Four-point thrust angular contact type rotating joint |
| CN206513987U (en) * | 2017-02-09 | 2017-09-22 | 长江大学 | A kind of movable elbow with multistage track groove |
| CN113389958A (en) * | 2021-06-22 | 2021-09-14 | 江苏瑞亿石油机械有限公司 | High-pressure movable elbow |
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