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Alignment bearing for underground drilling tool motor

A technology of righting bearings and bearings, which is applied in the direction of drilling driving devices, casings/covers/supports, drilling equipment, etc. in the wellbore, can solve the problem that the bearing capacity of righting bearings cannot meet the demand, and achieve axial space saving, The effect of bearing capacity increase and diameter increase

Active Publication Date: 2020-06-16
DONGFANG ELECTRIC MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the defects and deficiencies in the above-mentioned prior art, the present application proposes a centralizing bearing for a downhole drilling tool motor. The purpose of the invention of the present application is to solve the problem that the carrying capacity of the centralizing bearing cannot meet the demand in the prior art due to the limitation of the diameter of the motor. The problem

Method used

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  • Alignment bearing for underground drilling tool motor
  • Alignment bearing for underground drilling tool motor
  • Alignment bearing for underground drilling tool motor

Examples

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Embodiment 1

[0026] As a preferred embodiment of the application, refer to the attached figure 1 , 2 , 3 and 4, the present embodiment discloses:

[0027] The righting bearing for the downhole drilling tool motor includes a bearing static ring and a bearing moving ring. The inner surface of the bearing static ring is a closed structure, forming the friction surface of the static ring; the outer surface of the bearing moving ring forms the friction surface of the bearing moving ring, and the friction surface of the moving ring of the bearing and the friction surface of the static ring The diameter is the same as the outer diameter of the rotor core; the outer surface of the static ring of the centralizing bearing is provided with a positioning groove for the static ring, and the positioning groove of the static ring is matched with the positioning key of the static ring to realize the static ring of the bearing and the stator casing The circumferential positioning between them; the bearin...

Embodiment 2

[0029] As another preferred embodiment of the present application, refer to the attached Figure 1-5 , this example discloses:

[0030] like figure 1 As shown, the righting bearing for the motor of the downhole drilling tool includes a static bearing ring and a moving bearing ring. The static ring slot for the stator coil to pass through, the inner surface of the bearing static ring is a closed structure, forming a static ring friction surface; the outer surface of the bearing dynamic ring forms the bearing dynamic ring friction surface, and the bearing dynamic ring friction surface and the static ring The diameter of the friction surface is the same as the outer diameter of the rotor core; the outer surface of the static ring of the centralizing bearing is provided with a positioning groove for the static ring, and the positioning groove of the static ring is matched with the positioning key of the static ring to realize the static ring of the bearing and the Circumferentia...

Embodiment 3

[0032] As another preferred embodiment of the present application, refer to the attached Figure 1-5 , this example discloses:

[0033] The motor straightening bearing disclosed in the present application is a sliding bearing device used for motors with a high aspect ratio (motor length / motor rotor diameter) such as submersible motors or downhole drilling motors. It is mainly composed of two parts: fixed part and rotating part.

[0034] The fixed part includes: the static bearing ring 4, the left positioning ring 2, the right positioning ring 5 and other parts. Among them, the bearing static ring 4 is made of a whole piece of non-magnetic or weak magnetic conductive material, and there are several static ring notches 14 on it, and the stator coil 7 can pass through the static ring notches 14 directly, and the inner surface is a closed structure , forming the static ring friction surface 19; the static ring of the bearing is provided with a positioning groove 13, and the circum...

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Abstract

The invention discloses an alignment bearing for an underground drilling tool motor, and relates to the technical field of underground motors. The alignment bearing comprises a bearing static ring anda bearing movable ring. A plurality of static ring notches allowing stator coils to penetrate through are formed in the alignment bearing static ring, the inner surface of the bearing static ring isof a closed structure, and a static ring friction surface is formed; a bearing moving ring friction surface is formed on the outer surface of the bearing moving ring; and the diameter of the bearing moving ring friction surface and the diameter of the static ring friction surface are the same as the outer diameter of the rotor core. The plurality of static ring notches are formed in the static ring in the axial direction, the stator coils can directly penetrate through the static ring notches, so that the radial space of the motor is utilized to the maximum extent, the diameter of the frictionsurface is increased, the bearing capacity of the bearing is improved, the axial space of the whole motor is further saved, and the length of the motor is reduced.

Description

technical field [0001] The present invention relates to the technical field of downhole motors, in particular to a sliding bearing device for motors with a high aspect ratio (motor length / motor rotor diameter) such as submersible motors or downhole drilling motors, and more specifically relates to a downhole Centralizing bearings for drill motors. Background technique [0002] Downhole motors refer to motors that work underground for drilling or transporting fluids. Due to the limitation of the wellhead, this type of motor is generally a slender structure with an aspect ratio of more than 50 (motor length / motor rotor diameter). Some motors are less than 200mm in diameter, but their length even reaches more than ten meters. In order for the motor to operate safely and stably underground, an effective air gap must always be maintained between the outer diameter of the motor rotor and the inner diameter of the stator. If the air gap between the rotor and the stator cannot be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K5/167E21B41/00E21B4/04
CPCE21B4/04E21B41/0085H02K5/167
Inventor 林坤李少斌孙立宾兰勇韩锐伍俊肖柏洋赵志城陈艳伟赵杰
Owner DONGFANG ELECTRIC MACHINERY
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