Axial support for screw spindle of face engine and turbodrill

FIELD: oil and gas industry.

SUBSTANCE: roller tracks at edge inner and outer rings are made on same side, roller tracks at inner and outer rings are made with possible contact of balls with roller tracks of inner and outer rings at angle, greater than 45°, angle being formed by line, passing through points of contact of balls with roller tracks of inner and outer rings and line, perpendicular to longitudinal axis of bearing, profile of roller tracks on inner and outer rings is made from inequality condition D1 > (Din + Dout)/2, where D1 - diameter of circle passing through centers of balls in assembled bearing, Din - inner diameter of inner ring, Dout - outer diameter of outer ring, hardness of inner and outer rings being greater than 48 HRC, application point of radius of roller tracks profile on inner rings is placed in plane of stopping end of inner ring.

EFFECT: higher durability and reliability.

4 dwg

 

The invention relates to ball bearings angular contact and is used as an axial bearing in drilling technology, in particular in downhole motors and rotary drills for drilling oil and gas wells.

Known axial bearing (Dfrancisco, Fudbalske, Anglojewish. Reference manual “Screw downhole motors”, M.: Nedra, 1999, p.60, Risa)containing the rows of inner and outer rings placed between each adjacent inner and outer spacer rings and balls located in the cavity of each row formed by the rings. In operation, the balls in each row bearing are in contact with the surface of the treadmill, made in the form of a cone on the outer surface of the inner ring on each side and the inner surface of the outer ring on each side. The disadvantage of this design is that due to the small area of contact at the point of contact during operation generates a large voltage, which leads to the accumulation of the grooves on the track ball and the rapid formation of axial play.

This disadvantage is eliminated in a known bearing axial spindle downhole screw motors (Mthurman and other Downhole screw motors for drilling wells. M.: Nedra, 1981, p.21, Fig.9), which is the closest analogue to the claimed technical is at the decision, and selected as a prototype. Bearing axial spindle downhole screw motors consists of a ball angular contact bearing containing the rows of inner and outer rings and the balls are placed in the cavities of each row formed by the rings. Axial spindle bearing downhole screw motors does not contain intermediate spacer rings. The area of contact is considerably increased due to the fact that the raceways in the inner and outer rings made by radius, close to the value of the radius of the ball, as a consequence, the intensity of the experience of the groove in the raceway of the ball and formation of axial play reduced.

The disadvantages of the known axial bearing spindle downhole screw motors are slipping balls and a lower load-carrying capacity in the axial direction, since the contact angle in the axial bearing downhole screw motors is 45°. Another disadvantage of this design is that because of the small area of the thrust face of the bearing ring at ring bearings are pressed into the surrounding parts of the exploited products that have a lower hardness, which leads to premature failure of the product. Also a disadvantage is that the axial clearance of the axial bearing downhole screw motors necessary to ensure collection axial bearing spindle for eunuch screw engines, implemented due to the displacement of the centers of radius of the tracks relative to the plane of the end face as the outer and inner rings, as a consequence, when compressed package of shaft components, for example during Assembly of the spindle of the downhole motor, blocking balls and outer clamps at the rows of bearing, which leads to misalignment of the outer rings of the bearing and reduce resource.

The present invention is to remedy these disadvantages.

The technical result is achievable using the proposed invention is to increase the carrying capacity in the axial direction, improving the reliability and lifetime support axial spindle of the downhole motor and a turbo-drill (hereinafter axial support).

This task is solved in that the support axis of the spindle of the downhole motor and a turbo-drill, consisting of a ball angular contact bearing containing the rows of inner and outer rings and the balls are placed in a spherical cavity, which is the raceways of each row formed by the rings, the balls are installed on each side of inner and outer rings, each inner and outer ring includes a thrust face, according to the invention raceway on the extreme inner and outer rings are made from the ne side, raceways in the inner and outer rings are designed to ensure contact of the balls with the raceways of inner and outer rings at an angle, lots 45°, the angle formed by a line passing through the points of contact of the balls with the raceways of inner and outer rings, and a line perpendicular to the longitudinal axis of the bearing, the profile of the raceways in the inner and outer rings made of conditions of inequality D1>(D+Dap)/2, where D1 is the diameter of a circle passing through the centers of the balls in the assembled bearing, D the inner diameter of the inner ring, D - outer diameter of the outer ring, the hardness of the inner and outer rings 48 HRC, the point of application of the profile radius of the raceway on the inner ring is in the plane of the thrust end face of the inner ring.

Unlike the prototype in the present invention the profile of the raceways in the inner and outer rings made of conditions of inequality Dl>(D+D)/2, the area of the thrust end face of the inner ring as close as possible to the area of the thrust end face of the outer ring, which leads to the equalization of stresses and strains in the inner and outer rings that occur when you install the axle support in producing the product (for example, when the spindle Assembly of the downhole motor package details with the axis of the second support is clamped on the housing and on the shaft) and thereby improving the reliability.

Another difference from the prototype is that the raceways in the inner and outer rings are designed to ensure contact of the balls with the raceways of inner and outer rings at an angle, lots 45°that leads to an increase in load capacity axial bearing as a whole, and reduces the slippage of the balls, which provides increased load capacity in the axial direction, improving the reliability and lifetime of the axial bearings.

Another difference from the prototype is that the axial bearing includes on each side of the inner side and the outer ring, on which the raceway is made with one hand, thanks to another external relative axial bearing side of the ring area of the thrust face more, therefore, stresses in the zone of contact with other parts of the exploited products less.

Another difference from the prototype is that the hardness of the axial bearing rings is not less than 48 HRC. Due to this wear and intensity of education axial play reduced.

Another difference from the prototype is that the point of application of the profile radius of the raceway on the inner ring is in the plane of the thrust end face of the inner ring, which allows the conservation value of BEGO axial play in the bearing to increase backlash, educated inner rings, and to avoid jamming of the balls during Assembly, this avoids misalignment of the outer casing and to increase the share of work operated products that together with the above symptoms provides technical result.

Figure 1 shows a General view of the axial bearing in a longitudinal section, on figa - one row axial bearing with inner and outer ring, inner side and outer side of the ring, in contact with the ball in longitudinal section, on figb is the enlarged view of figure 2A, figure 3 - axial bearing in the spindle of the downhole motor.

Axial bearing (Fig.1-3) contains rows of outer ring 1, the inner rings 2, balls 3, located in the cavity of each row formed by the rings 1 and 2, and side inner ring 4, and the side outer ring 5 on each side of the bearing. Axial bearing when installed in the exploited products, for example in the spindle of the downhole motor (3)is compressed package details on the shaft 6 and the housing 7.

In operation, the shaft 6 with service parts, including the inner rings 2, 4, rotates freely relative to the housing 7 with service parts, including the outer rings 1, 5. Axial bearing serves to transmit axial loads from the shaft 6 in the housing 7, the balls 3 are continuously contactes outer and inner rings 1, 2, 4, 5 (figa), a, b, C - points of contact α - contact angle.

Unlike the prototype when we are bearing all the hallmarks of the invention in conjunction with the known result in the increase of the bearing capacity in the axial direction, increase capacity, which affects the reduction of the loads, which reduces wear and tear, improving reliability and lifetime axial bearing.

Axial spindle bearing of the downhole motor and a turbo-drill, consisting of a ball angular contact bearing containing the rows of inner and outer rings and the balls are placed in a spherical cavity, which is the raceways of each row formed by the rings, the balls are installed on each side of inner and outer rings, each inner and outer ring includes the axial end face, characterized in that the raceway on the extreme inner and outer rings are made from one side of the raceways in the inner and outer rings are designed to ensure contact of the balls with the raceways of inner and outer rings at an angle, large 45°, the angle formed by a line passing through the points of contact of the balls with the raceways of inner and outer rings and a line perpendicular to the longitudinal axis of the bearing, the profile is more expensive is rolling on the inner and outer rings are made of the conditions of inequality:

D1>(DNR+Ddrug)/2,

where D1- the diameter of a circle passing through the centers of the balls in the assembled bearing,

DNRthe inner diameter of the inner ring,

Ddrug- outer diameter of the outer ring,

the hardness of the inner and outer rings is greater than 48 HRC, the point of application of the profile radius of the raceway on the inner ring is in the plane of the thrust end face of the inner ring.



 

Same patents:

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FIELD: mechanical engineering.

SUBSTANCE: rotor axis of gear mechanism, performing a planetary movement, is displaced relatively to stator axis for distance of engagement eccentricity. As source auxiliary contour ellipse is used, while proportional coefficient k, determining radius of guiding circle, is taken equal to half necessary number of teeth z of wheel (k = z/2), optimal shape of its teeth is provided by rational combination of ellipse shape coefficient λ, equal to relation of lengths of its semi-axes and eccentricity coefficient of auxiliary contour, in form of relation of length of greater ellipse semi-axis to rolling circle radius, while inner and outer profiles are made in form of elliptic profiles from common ellipse contour.

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FIELD: oil and gas industry.

SUBSTANCE: device has turbine module, screw gear couple, including stator and rotor, assembly for connection of rotor of screw gear couple to turbine module and spindle, according to invention, rotor of screw gear couple has pass channel, into which a valve is mounted, including locking element and saddle, while locking element is mounted on resilient element with space to saddle surface and with possible contact with saddle surface. When engine is launched whole flow of drilling mud skirts screw gear couple through pass channel in rotor and open valve, i.e. through space between locking element and saddle surface and is directed into turbine module. In face engine loads on elements of gear couple are decreased during its launch due to redistribution of flows of working liquid between screw gear couple and turbine.

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FIELD: mining industry.

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FIELD: oil and gas industry.

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FIELD: mechanical engineering.

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