CN110056309B - Fixed-shaft rotary positive displacement power tool - Google Patents

Fixed-shaft rotary positive displacement power tool Download PDF

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Publication number
CN110056309B
CN110056309B CN201910386992.9A CN201910386992A CN110056309B CN 110056309 B CN110056309 B CN 110056309B CN 201910386992 A CN201910386992 A CN 201910386992A CN 110056309 B CN110056309 B CN 110056309B
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CN
China
Prior art keywords
sleeve
rotor
bearing
eccentric
eccentric bearing
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CN201910386992.9A
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Chinese (zh)
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CN110056309A (en
Inventor
叶哲伟
冯康
谭浪
程成
刘志杨
李安乐
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Southwest Petroleum University
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Southwest Petroleum University
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Publication of CN110056309A publication Critical patent/CN110056309A/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00Drives for drilling, used in the borehole
    • E21B4/02Fluid rotary type drives
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03CPOSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C2/00Rotary-piston engines
    • F03C2/08Rotary-piston engines of intermeshing-engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00Sliding-contact bearings for exclusively rotary movement
    • F16C17/12Sliding-contact bearings for exclusively rotary movement characterised by features not related to the direction of the load
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2352/00Apparatus for drilling

Abstract

The invention relates to a fixed-shaft rotary positive displacement power tool, which comprises an outer cylinder, an inner rotor, an outer rotor, a stop ring sleeve, a hole snap spring, a TC bearing outer sleeve, an upper TC bearing inner sleeve, a lower TC bearing inner sleeve, an eccentric bearing inner sleeve and an eccentric bearing outer sleeve, wherein the inner rotor is arranged in the outer cylinder; the upper end of the outer cylinder is connected with a drill column; the inner rotor is internally meshed in the outer rotor through the spiral teeth and forms at least one conjugate closed cavity with the outer rotor, and the continuous rotation of the inner rotor can cause the conjugate closed cavity to continuously extend to move downwards so as to ensure that working media (drilling fluid) are sequentially pushed downwards; the upper end and the lower end of the inner rotor are provided with eccentric bearings, each eccentric bearing consists of an eccentric bearing inner sleeve and an eccentric bearing outer sleeve, and the eccentric distance of the eccentric bearings is equal to the central distance between the inner rotor and the outer rotor; TC bearings are arranged at the upper part and the lower part of the outer rotor; the invention can be used as a downhole power tool, and the inner rotor arranged in the eccentric bearing is subjected to fixed-shaft rotation under the action of hydraulic pressure to provide rotary power for the downhole tool combination, thereby eliminating the negative influence caused by centrifugal force.

Description

Fixed-shaft rotary positive displacement power tool
Technical Field
The invention relates to the technical field of drilling engineering in the petroleum and gas industry, in particular to an underground power tool.
Background
At present, the downhole power drilling tool applied to oil and gas wells at home and abroad mainly comprises: screw drilling tools, turbine drilling tools, electric drilling tools, and the like. The research and application conditions of various drilling tools are different at home and abroad, and in addition, the advantages of various drilling tools are different from those of short plates, for example, the working torque of the screw drilling tool is related to pressure drop and structure but is not related to rotating speed, but has transverse vibration; although the turbine drilling tool has the soft characteristic of high speed and large torque and has no advantages of transverse vibration and the like, the turbine drilling tool has the defects of overhigh output rotating speed, overlong size of the whole machine and the like; the electric drilling tool has the advantages of high output rotating speed, complex structure of the multi-stage speed reducer, poor reliability and high requirements on the insulation and sealing performance of the underground motor. To solve the above problems, a fixed axis rotary positive displacement power tool has been proposed to solve the above drawbacks while maintaining most of the above advantages.
Disclosure of Invention
The invention provides a fixed-shaft rotary positive displacement power tool, which aims to solve the problem of transverse vibration of a downhole power tool in the prior art.
In order to solve the above problems, according to one aspect of the present invention, there is provided a fixed-axis rotary positive displacement power tool, comprising an outer cylinder, an outer rotor, an inner rotor, a stopper ring sleeve, a circlip for a hole, a TC bearing outer sleeve, an upper TC bearing inner sleeve, a lower TC bearing inner sleeve, an eccentric bearing inner sleeve, and an eccentric bearing outer sleeve; the upper end of the outer cylinder is connected with a drill column; the inner rotor is internally meshed with the outer rotor through the spiral teeth and forms at least one conjugate closed cavity with the outer rotor to contain working media (drilling fluid), and the continuous rotation of the inner rotor can cause the conjugate closed cavity to continuously extend axially and move downwards so as to ensure that the working media (drilling fluid) are sequentially pushed downwards; the upper end and the lower end of the inner rotor are provided with eccentric bearings, each eccentric bearing consists of an eccentric bearing inner sleeve and an eccentric bearing outer sleeve, and the eccentric distance of the eccentric bearings is equal to the central distance between the inner rotor and the outer rotor; the upper part and the lower part of the outer rotor are respectively provided with an upper TC bearing and a lower TC bearing.
Further, urceolus upper portion and lower part all are provided with the toper internal thread, urceolus upper portion and lower part inner chamber all are equipped with the jump ring groove, and there is the snap ring groove upper portion jump ring groove below, has the snap ring groove lower part jump ring groove top, is provided with the recess that matches with the little boss of snap ring one side between snap ring groove and jump ring groove, prevents that eccentric bearing overcoat from rotating.
Furthermore, the upper part and the lower part of the inner rotor are both provided with a central hole, and the upper part and the lower part of the inner rotor are both provided with at least one through hole at the central hole; the middle of the inner rotor is of a screw structure; the upper end of the inner rotor is provided with an inner hexagonal structure; the lower end of the inner rotor is provided with threads, and the upper part of the threads is provided with a conical surface.
The beneficial effect of adopting the further technical scheme is that: the inner rotor center hole and the through-flow hole can realize the diversion of drilling fluid, the conical surface on the upper part of the thread can ensure the coaxiality with the lower end connecting piece, and the inner hexagonal structure at the upper end of the inner rotor is convenient for a wrench to screw the inner rotor into the outer rotor.
Further, the outer rotor is of a shaft sleeve type structure, a positioning step and an internal thread are arranged inside the upper end of the outer rotor, and a positioning step and an external thread are arranged outside the lower end of the outer rotor; and a screw curved surface structure matched with the inner rotor is formed in the outer rotor through a glue injection process.
The beneficial effect of adopting the further technical scheme is that: the outer rotor can realize axial positioning of the upper end and the lower end and assembly of a TC bearing in a narrow radial space, so that the fixed-axis rotation of the outer rotor is ensured; the outer rotor and the inner rotor do fixed-axis rotation of gear inner meshing.
Furthermore, a hard alloy ring is sintered at one end of the eccentric bearing outer sleeve, and two grooves with equal width are formed at the other end of the eccentric bearing outer sleeve; the middle part of the eccentric bearing outer sleeve is provided with a through hole eccentric with the outer diameter, and a hard alloy sleeve is sintered in the through hole; a step is arranged at one end of the eccentric bearing outer sleeve, which is sintered with the hard alloy ring; a plurality of through-flow holes are sleeved outside the eccentric bearing; the eccentric bearing inner sleeve is of a shaft sleeve type structure, and a hard alloy sleeve is sintered outside the eccentric bearing inner sleeve; the eccentric bearing inner sleeve and the eccentric bearing outer sleeve form an eccentric bearing, and the eccentricity of the eccentric bearing is equal to the center distance between the inner rotor and the outer rotor.
The beneficial effect of adopting the further technical scheme is that: the sintered hard alloy ring at one end of the eccentric bearing outer sleeve is matched with the sintered hard alloy ring at the upper end part of the upper TC bearing inner sleeve to bear the axial force in the rotating process of the outer rotor; the other end of the eccentric bearing outer sleeve is provided with two symmetrical grooves with equal width, and the two symmetrical grooves can limit the rotation of the eccentric bearing outer sleeve under the action of the stop ring; the hard alloy sleeve sintered by the eccentric bearing inner sleeve and the eccentric bearing outer sleeve can play a role of a bearing in a severe underground environment.
Further, the upper TC bearing inner sleeve is of a shaft sleeve type structure, a hard alloy sleeve is sintered at the upper part of the upper TC bearing inner sleeve, a positioning step is arranged outside the middle of the upper TC bearing inner sleeve, and an external thread is arranged at the lower end of the upper TC bearing inner sleeve; a hard alloy ring is sintered at the upper end of the upper TC bearing inner sleeve; the lower end of the upper TC bearing inner sleeve is connected with the upper end of the outer rotor through threads, and the upper portion of the upper TC bearing inner sleeve is matched with the TC bearing outer sleeve to form an upper TC bearing.
Further, the lower TC bearing inner sleeve is of a shaft sleeve type structure, a hard alloy sleeve is sintered at the lower part of the lower TC bearing inner sleeve, and threads are arranged inside the lower end of the lower TC bearing inner sleeve; the lower end of the upper TC bearing inner sleeve is sintered with a hard alloy ring; the lower TC bearing inner sleeve is connected with the lower end of the outer rotor through threads, and the lower portion of the lower TC bearing inner sleeve is matched with the TC bearing outer sleeve to form a lower TC bearing.
The beneficial effect of adopting the further technical scheme is that: the upper TC bearing inner sleeve is matched with the TC bearing outer sleeve to form a wear-resistant upper TC bearing; the lower TC bearing inner sleeve is matched with the TC bearing outer sleeve to form a wear-resistant lower TC bearing, so that the fixed shaft rotation of the outer rotor is effectively ensured.
The invention has the beneficial effects that:
the invention can be directly used in a drilling tool assembly, and the upper end and the lower end of the outer cylinder are connected in the down-hole drilling tool assembly; the inner rotor eccentric to the axis of the outer shell and the outer rotor concentric to the axis of the outer cylinder respectively do fixed shaft rotation under the action of drilling hydraulic pressure, and the inner rotor transmits power to the lower end through threads at the lower end of the inner rotor; the rotating speed of the fixed-axis rotary positive displacement power tool is only related to the displacement and the structure and is not related to the working conditions (bit pressure, torque and the like) of the fixed-axis rotary positive displacement power tool; the working torque is related to pressure drop and structure and is not related to rotating speed; the fixed-shaft rotation positive displacement power tool overcomes the defects of high rotating speed and small torque of a turbine drilling tool, has the characteristics of low rotating speed and large torque, and is particularly suitable for drilling operation.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a cross-sectional view of a fixed axis rotary positive displacement power tool according to the present invention.
Fig. 2 is a cross-sectional view taken along the line a-a in fig. 1.
Fig. 3 is a cross-sectional view taken along the line B-B in fig. 1.
Fig. 4 is a sectional view showing the construction of the eccentric bearing according to the present invention.
Fig. 5 is a schematic structural view of an eccentric bearing according to the present invention.
Fig. 6 is a sectional view showing the upper TC bearing according to the present invention.
Fig. 7 is a sectional view showing a lower TC bearing according to the present invention.
FIG. 8 is a schematic view of the snap ring and snap ring sleeve of the present invention.
FIG. 9 is a block diagram of an embodiment of the present invention disposed in an axial impactor.
FIG. 10 is a block diagram of an embodiment of the present invention disposed in a downhole motor.
In the figure: 1-outer cylinder, 2-outer rotor, 3-inner rotor, 4-stop ring, 5-stop ring sleeve, 6-hole snap spring, 7-TC bearing outer sleeve, 8-upper TC bearing inner sleeve, 9-lower TC bearing inner sleeve, 10-eccentric bearing inner sleeve, 11-eccentric bearing outer sleeve, 01-fixed-shaft rotary positive displacement power tool, 02-impact assembly, 03-coupling assembly, 04-transmission shaft assembly and 05-drill bit.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to fig. 1 to 10 in the embodiment of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in the attached figure 1, the invention provides a fixed-shaft rotating positive displacement power tool, which comprises an outer cylinder 1, an inner rotor 3, an outer rotor 2, a stop ring 4, a stop ring sleeve 5, a snap spring 6 for holes, a TC bearing outer sleeve 7, an upper TC bearing inner sleeve 8, a lower TC bearing inner sleeve 9, an eccentric bearing inner sleeve 10 and an eccentric bearing outer sleeve 11; the upper end of the outer cylinder 1 is connected with a drill string; as shown in fig. 2 and 3, the inner rotor 3 is internally engaged in the outer rotor 2 through spiral teeth and forms at least one conjugate closed cavity with the outer rotor 2, and the upper end and the lower end of the inner rotor 3 are provided with eccentric bearings; the eccentric bearing inner sleeve 10 and the eccentric bearing outer sleeve 11 form an eccentric bearing, and the eccentricity of the eccentric bearing is equal to the center distance between the inner rotor 3 and the outer rotor 2; the upper part and the lower part of the outer rotor 2 are respectively provided with an upper TC bearing and a lower TC bearing; the stop rings 4 are used in pairs and arranged on the outer sides of the eccentric bearings, the stop ring sleeves 5 clamp the stop rings 4, and the clamp springs are arranged in the clamp spring grooves to limit the movement of the stop ring sleeves 5; thus, the inner rotor 3 is screwed into the outer rotor 2 through the inner hexagonal structure at the upper end of the inner rotor 3, so that the section curve of the overlapped part of the inner rotor 3 and the outer rotor 2 is a pair of conjugate curves, the requirement of gear transmission is met, the sealing requirement of a positive displacement motor is also met, the inner rotor 3 and the outer rotor 2 form an inner meshing gear set, when drilling fluid enters a tool, the inner rotor 3 performs fixed-shaft rotation under the limitation of eccentric bearings at two ends and transmits power to the lower end, and meanwhile, the outer rotor 2 performs fixed-shaft rotation under the limitation of an upper TC bearing and a lower TC bearing; as shown in attached figures 1 and 8, the eccentric bearings are arranged at the upper end and the lower end of the inner rotor 3, the stop ring 4 is arranged at the outer side of the eccentric bearings, the stop ring sleeve 5 blocks the stop ring 4, and the hole is arranged in the clamp spring groove by using a clamp spring 6 to limit the movement of the stop ring sleeve 5; thus, the present fixed-axis positive displacement power impact tool may be mounted directly in a conventional drill assembly.
As shown in the attached drawings 4 and 5, the eccentric bearing is composed of an eccentric bearing outer sleeve 11 and an eccentric bearing inner sleeve 10, one end of the eccentric bearing outer sleeve 11 is sintered with a hard alloy ring, and the other end of the eccentric bearing outer sleeve is provided with two grooves with equal width; a through hole eccentric to the outer diameter is formed in the middle of the eccentric bearing outer sleeve 11, and a hard alloy sleeve is sintered in the through hole; a step is arranged at one end of the eccentric bearing outer sleeve 11, which is sintered with the hard alloy ring; the eccentric bearing outer sleeve 11 is provided with a plurality of through flow holes; the eccentric bearing inner sleeve 10 is of a shaft sleeve type structure, and a hard alloy sleeve is sintered outside the eccentric bearing inner sleeve. Thus, the hard alloy ring sintered at one end of the eccentric bearing outer sleeve 11 is matched with the hard alloy ring sintered at the upper end part of the upper TC bearing inner sleeve 8 to bear the axial force in the rotating process of the outer rotor 2; the other end of the eccentric bearing outer sleeve 11 is provided with two equal-width grooves which can limit the rotation of the eccentric bearing outer sleeve 11, the through-flow hole arranged on the eccentric bearing outer sleeve 11 can guide drilling fluid, and the hard alloy sleeve sintered by the eccentric bearing inner sleeve 10 and the eccentric bearing outer sleeve 11 can play a role of a bearing in a severe underground environment.
As shown in fig. 6 and 7, the upper TC bearing inner sleeve 8 is of a shaft sleeve type structure, a hard alloy sleeve is sintered at the upper part, a positioning step is arranged outside the middle part, and an external thread is arranged at the lower end; the upper end of the upper TC bearing inner sleeve 8 is sintered with a hard alloy ring, and the upper part of the upper TC bearing inner sleeve 8 is matched with the TC bearing outer sleeve 7 to form an upper TC bearing. The lower TC bearing inner sleeve 9 is of a shaft sleeve type structure, a hard alloy sleeve is sintered at the lower part of the lower TC bearing inner sleeve, and threads are arranged inside the lower end of the lower TC bearing inner sleeve; the lower end of the upper TC bearing inner sleeve 8 is sintered with a hard alloy ring, and the lower part of the lower TC bearing inner sleeve 9 is matched with the TC bearing outer sleeve 7 to form a lower TC bearing. Thus, the upper TC bearing and the lower TC bearing act together to enable the outer rotor 2 to do fixed-axis rotation and limit the axial movement of the outer rotor; a small gap between the upper TC bearing inner sleeve 8 and the TC bearing outer sleeve 7 can allow drilling fluid to flow through to cool the upper TC bearing, and meanwhile, the drilling fluid flowing through the gap between the upper TC bearing inner sleeve 8 and the TC bearing outer sleeve 7 also flows through a gap between the outer rotor 2 and the outer cylinder 1 to cool the outer rotor 2.
The structure diagram of the invention as the power implementation mode in the underground axial impactor is shown in the attached figure 9, the impact assembly 02 is connected to the lower end of the shell in the fixed-shaft rotary positive displacement power tool 01 through threads, during drilling operation, the inner rotor drives the fixed shaft of the movable disc in the impact assembly 02 to rotate, the through flow area of drilling fluid between the movable disc and the static disc is changed, so that a water hammer phenomenon is generated, axial impact is further generated, the rock breaking efficiency of a drill bit is improved, and stick-slip vibration of a drill string is reduced.
The structure of the invention as the power in the downhole power drill refers to the attached figure 10, a coupling assembly 03 is arranged at the lower end of an inner rotor 3 in a fixed-shaft rotary positive displacement power tool 01, and a transmission shaft assembly 04 and a drill bit 05 are further arranged in sequence; in the drilling process, the fixed-shaft rotary positive displacement power tool provides power for the drill bit to break rock, and negative effects caused by radial vibration when the conventional screw motor works are avoided while the conventional screw motor has the characteristics of low rotating speed and large torque.
The fixed-shaft rotary positive displacement power tool can also be arranged on other downhole tools to achieve the effect of a downhole power motor.
For convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the specification and the attached drawing 1, and the description comprises the following steps: the positional relationships of the front, back, left, right, up, down, and middle are determined by the layout of fig. 1 of the specification for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or components must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Claims (5)

1. A fixed-shaft rotary positive displacement power tool (01) comprises an outer cylinder (1), an inner rotor (3), an outer rotor (2), a stop ring (4), a stop ring sleeve (5), a hole snap spring (6), a TC bearing outer sleeve (7), an upper TC bearing inner sleeve (8), a lower TC bearing inner sleeve (9), an eccentric bearing inner sleeve (10) and an eccentric bearing outer sleeve (11); the upper end of the outer cylinder (1) is connected with a drill string; the inner rotor (3) is internally meshed in the outer rotor (2) through spiral teeth and forms at least one conjugate closed cavity with the outer rotor (2), and the upper end and the lower end of the inner rotor (3) are provided with eccentric bearings; the eccentric bearing inner sleeve (10) and the eccentric bearing outer sleeve (11) form an eccentric bearing, and the eccentricity of the eccentric bearing is equal to the center distance between the inner rotor (3) and the outer rotor (2); the upper part and the lower part of the outer rotor (2) are respectively provided with an upper TC bearing and a lower TC bearing; the stop rings (4) are used in pairs and arranged on the outer sides of the eccentric bearings, the stop ring sleeves (5) clamp the stop rings (4), and the hole clamp springs (6) are arranged in the clamp spring grooves to limit the stop ring sleeves (5) to move.
2. The fixed-axis rotary positive displacement power tool as claimed in claim 1, wherein the outer rotor (2) is of a shaft sleeve type structure, and a positioning step and an internal thread are arranged inside the upper end of the outer rotor (2); the outer part of the lower end of the outer rotor (2) is provided with a positioning step and an external thread; and a screw curved surface structure matched with the inner rotor (3) is formed in the outer rotor (2) through a glue injection process.
3. The fixed-axis rotary positive displacement power tool according to claim 1, wherein the eccentric bearing housing (11) has a cemented carbide ring sintered at one end and two equal-width grooves formed at the other end; a through hole eccentric to the outer diameter is formed in the middle of the eccentric bearing outer sleeve (11), and a hard alloy sleeve is sintered in the through hole; a step is arranged at one end of the eccentric bearing outer sleeve (11) sintered with the hard alloy ring; the eccentric bearing outer sleeve (11) is provided with a plurality of through flow holes; the eccentric bearing inner sleeve (10) is of a shaft sleeve type structure, and a hard alloy sleeve is sintered outside the eccentric bearing inner sleeve.
4. The fixed-axis rotary positive displacement power tool as claimed in claim 1, wherein the upper TC bearing inner sleeve (8) is a sleeve type structure, a hard alloy sleeve is sintered at the upper part thereof, a positioning step is provided at the middle outer part thereof, and an external thread is provided at the lower end thereof; and a hard alloy ring is sintered at the upper end of the upper TC bearing inner sleeve (8).
5. The fixed-axis rotary positive displacement power tool as claimed in claim 1, wherein the lower TC bearing inner housing (9) is of a sleeve-type structure, a cemented carbide sleeve is sintered at the lower part, and a thread is provided inside the lower end; and a hard alloy ring is sintered at the lower end of the upper TC bearing inner sleeve (8).
CN201910386992.9A 2019-05-10 2019-05-10 Fixed-shaft rotary positive displacement power tool Active CN110056309B (en)

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Application Number Priority Date Filing Date Title
CN201910386992.9A CN110056309B (en) 2019-05-10 2019-05-10 Fixed-shaft rotary positive displacement power tool

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Application Number Priority Date Filing Date Title
CN201910386992.9A CN110056309B (en) 2019-05-10 2019-05-10 Fixed-shaft rotary positive displacement power tool

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CN110056309B true CN110056309B (en) 2020-08-11

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CN111550400A (en) * 2020-05-14 2020-08-18 天津市百利溢通电泵有限公司 Axial-flow type inner gearing displacement pump with outer rotor provided with rubber inner bushing

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