CN215672074U - Sucker rod carbon fiber eccentric wear prevention coupling - Google Patents
Sucker rod carbon fiber eccentric wear prevention coupling Download PDFInfo
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- CN215672074U CN215672074U CN202122070072.1U CN202122070072U CN215672074U CN 215672074 U CN215672074 U CN 215672074U CN 202122070072 U CN202122070072 U CN 202122070072U CN 215672074 U CN215672074 U CN 215672074U
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Abstract
The utility model discloses a carbon fiber anti-eccentric coupling of a sucker rod, which relates to the technical field of sucker rod couplings and comprises a coupling main body and an anti-eccentric sleeve, wherein butt joints for connecting sucker rods are arranged at two ends of the coupling main body, the coupling main body is of a split structure and is made of any one of 20crmo, 35crmo or stainless steel, and the coupling main body comprises a central rod and a connecting seat; the central rod is a solid rod piece, a limit ring is arranged near the upper end of the central rod, and the lower end of the central rod is in threaded connection with the connecting seat; the eccentric wear prevention sleeve is made of carbon fiber, the outer contour of the cross section of the eccentric wear prevention sleeve is a circular arc quadrangle, and the eccentric wear prevention sleeve is sleeved on the central rod; two ends of the eccentric wear prevention sleeve are respectively abutted against the limiting ring and the connecting seat, and the outer diameter of the eccentric wear prevention sleeve is larger than the maximum outer diameter of the central rod and the connecting seat; the coupling has simple structure and simple and convenient installation, the coupling main body can be repeatedly utilized, and the material cost is reduced; the carbon fiber material is used as the eccentric wear prevention sleeve, so that the friction between the sucker rod and the oil pipe and the friction between the oil pipe and the eccentric wear prevention sleeve can be effectively reduced.
Description
Technical Field
The utility model relates to the technical field of sucker rod couplings, in particular to a carbon fiber anti-eccentric coupling of a sucker rod.
Background
In the sucker rod pump oil extraction process, the breakage and the loss of an oil pipe caused by the eccentric wear of a rod and a pipe are one of the main reasons of the well lying of an oil well, and meanwhile, the problems that the mineralization degree of produced liquid is high and the corrosivity is strong are found through research on the oil well with the serious eccentric wear of the rod and the pipe, so that the well lying of the oil well is accelerated. Aiming at the problems of eccentric wear and corrosion, a sucker rod is often used for connecting an eccentric wear prevention coupling in the process of underground operation. The existing anti-eccentric coupling is generally provided with a wear-resistant layer which covers the whole outer wall surface of the coupling, the material of the coupling is mostly stainless steel, the corrosion resistance and the anti-eccentric wear performance of the stainless steel are poor, meanwhile, the toughness is poor, the oil pipe is easier to wear through, and the requirement of oil well production cannot be met.
Chinese patent CN201220547719.3 discloses a ball type sucker rod anti-eccentric coupling, which comprises a coupling body, wherein one end of the coupling body is provided with internal threads and the other end is provided with external threads, a plurality of arc-shaped ball grooves are circumferentially distributed on the coupling body, large balls are arranged in the ball grooves, the large balls are in clearance fit with the ball grooves, a pressing ring is further embedded at the port of the ball grooves, the pressing ring is in clearance fit with the large balls, and the inner diameter of the pressing ring is smaller than the diameter of the large balls; the technical scheme seeks to convert sliding friction between the coupling body and the inner wall of the oil pipe into rolling friction, but in actual oil exploitation, a large amount of oil dirt and a small amount of sand and stone impurities are attached to the inner wall of the oil pipe, so that the friction between the coupling and the inner wall of the oil pipe is still sliding friction, and the friction between the coupling and the inner wall of the oil pipe is further aggravated by the protruding balls.
Chinese patent CN201920260542.0 discloses an anti-eccentric coupling of a sucker rod, which comprises a coupling main body and a wear-resistant sleeve, wherein the middle part of the coupling main body is of a solid structure, threaded holes for connecting with the sucker rod are arranged inside two ends of the coupling main body, a groove is annularly arranged on the outer wall of the middle part of the coupling main body, the wear-resistant sleeve is sleeved on the groove, the inner wall of the wear-resistant sleeve is attached to the groove, a flow channel is concavely arranged on the wear-resistant sleeve along the axial direction of the wear-resistant sleeve, and a plurality of flow channels are uniformly distributed along the circumferential direction of the wear-resistant sleeve; the wear-resistant sleeve in the technical scheme can not be replaced, the maintenance cost is high, the outer wall of the wear-resistant sleeve is provided with a plurality of flow channels, and the flow channels can aggravate the friction between the coupling and the inner wall of the oil pipe in the using process.
Therefore, the development of an anti-eccentric coupling with good wear resistance and low maintenance cost is urgently needed.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a carbon fiber anti-eccentric coupling of a sucker rod.
The technical scheme of the utility model is as follows: a carbon fiber anti-eccentric coupling for a sucker rod comprises a coupling main body and an anti-eccentric sleeve, wherein butt joints for connecting the sucker rod are arranged at two ends of the coupling main body, and the coupling main body is of a split structure and comprises a central rod and a connecting seat; the central rod is a solid rod piece, a limit ring is arranged near the upper end of the central rod, and the lower end of the central rod is detachably connected with the connecting seat; the eccentric wear prevention sleeve is made of carbon fiber and is sleeved on the central rod; the two ends of the eccentric wear prevention sleeve are respectively abutted against the limiting ring and the connecting seat, and the outer diameter of the eccentric wear prevention sleeve is larger than the maximum outer diameters of the central rod and the connecting seat.
Preferably, the coupling body is made of any one of 20crmo, 35crmo or stainless steel.
Preferably, an axial positioning key is arranged on the inner wall of the eccentric wear prevention sleeve, and an inner key groove matched with the positioning key is arranged on the central rod.
Preferably, the positioning keys on the inner wall of the eccentric wear prevention sleeve are provided with a plurality of positioning keys and are arranged in a circumferential array, correspondingly, the inner key groove on the central rod is also provided with a plurality of positioning keys in one-to-one correspondence.
Preferably, the two ends of the central rod are provided with external thread joints, the two ends of the connecting seat are provided with internal thread joints, and the lower end of the central rod is in threaded connection with the connecting seat.
Preferably, the outer contour of the cross section of the eccentric wear prevention sleeve is a circular arc quadrangle.
Preferably, the diameter D of the eccentric wear prevention sleeve is set according to the size of the oil pipe, wherein the diameters D of the eccentric wear prevention sleeve corresponding to 73mm and 89mm oil pipes are 54mm and 68mm respectively, and the diameters D of the eccentric wear prevention sleeve of other specifications = the inner diameter of the oil pipe-8 mm.
Preferably, the outer edges of the two ends of the eccentric wear prevention sleeve are provided with round corners.
Compared with the prior art, the utility model has the following advantages:
the carbon fiber anti-eccentric coupling has the advantages of simple structure, simple and convenient installation, reusability of the coupling main body and reduction of material cost; the carbon fiber material is adopted as the eccentric wear prevention sleeve, so that the friction between the sucker rod and the oil pipe and the friction between the oil pipe and the eccentric wear prevention sleeve can be effectively reduced, and the effect of righting the sucker rod is also achieved through the improvement on the structure of the eccentric wear prevention sleeve; after the device is used, the problems of breakage of the sucker rod of the mechanical production well and leakage of an oil pipe are reduced, the maintenance-free period of the oil well is prolonged, and the maintenance cost is reduced.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an exploded view of the collar body;
FIG. 3 is a longitudinal and cross-sectional view of an anti-eccentric sleeve;
FIG. 4 is a longitudinal sectional view and a transverse sectional view of the eccentric wear prevention sleeve according to the seventh embodiment.
In the figure: 1. center rod, 101, spacing ring, 102, interior keyway, 103, external thread joint, 2, connecting seat, 201, internal thread joint, 3, prevent eccentric wear cover, 301, navigation key, 302, runner.
Detailed Description
The utility model is further illustrated below with reference to the figures and examples.
Example one
Referring to fig. 1, the carbon fiber anti-eccentric coupling for the sucker rod comprises a coupling body and an anti-eccentric sleeve 3, wherein butt joints for connecting the sucker rod are arranged at two ends of the coupling body, and the coupling body is of a split structure and comprises a central rod 1 and a connecting seat 2; the central rod 1 is a solid rod piece, a limit ring 101 is arranged near the upper end of the central rod, and the lower end of the central rod is detachably connected with the connecting seat 2; the eccentric wear prevention sleeve 3 is made of carbon fiber and is sleeved on the central rod 1; the both ends of eccentric wear prevention cover 3 offset with spacing ring 101 and connecting seat 2 respectively to the external diameter of eccentric wear prevention cover 3 is greater than the biggest external diameter of well core rod 1 and connecting seat 2.
In more detail, the two ends of the central rod 1 are provided with external thread joints 103, the two ends of the connecting seat 2 are provided with internal thread joints 201, and the lower end of the central rod 1 is in threaded connection with the connecting seat 2; the two ends of the coupling main body are respectively provided with an internal thread joint 201 and an external thread joint 103 which respectively correspond to the external thread joint 103 and the internal thread joint 201 of the sucker rod, so that the coupling of the sucker rod can be directly connected with the two sucker rods without dismantling the coupling of the sucker rod.
As shown in fig. 2, the coupling body can be disassembled into two parts for replacing the eccentric wear prevention sleeve 3, the central rod 1 and the connecting seat 2 are connected through the external thread joint 103 and the internal thread joint 201, and the carbon fiber eccentric wear prevention sleeve 3 is installed on the central rod 1 after being disassembled.
The eccentric wear prevention sleeve 3 is made of carbon fiber materials, and the strength of the carbon fiber materials is 7-10 times of that of steel with the same section; the carbon fiber material also has strong wear resistance and impact resistance and has obvious advantages compared with common materials; meanwhile, the carbon fiber has low thermal expansion coefficient and high temperature resistance, and is more suitable for deep well environment.
Before operation, a designer analyzes the position and the depth of the eccentric wear well section of the oil well according to the operation well history, and calculates the using quantity, the specification and the running position of the carbon fiber eccentric wear prevention coupling. During operation, two ends of the carbon fiber anti-eccentric coupling are respectively connected with the external thread joint 103 and the internal thread joint 201 of the sucker rod, and the carbon fiber anti-eccentric coupling is arranged in a shaft according to operation design. Because the eccentric wear prevention sleeve 3 is the part with the largest coupling outer diameter, the coupling main body is not directly contacted with an oil pipe, the coupling main body is generally not abraded in normal use, the coupling main body part can be disassembled after the operation is taken out, and the eccentric wear prevention sleeve 3 is replaced again after the operation is qualified through detection.
The carbon fiber anti-eccentric coupling has the advantages of simple structure, simple and convenient installation, reusability of the coupling main body and reduction of material cost; the carbon fiber material is adopted as the eccentric wear prevention sleeve 3, so that the friction between the sucker rod and the oil pipe and the friction between the oil pipe and the eccentric wear prevention sleeve 3 can be effectively reduced; after the device is used, the problems of breakage of the sucker rod of the mechanical production well and leakage of an oil pipe are reduced, the maintenance-free period of the oil well is prolonged, and the maintenance cost is reduced.
Example two
Referring to fig. 1-2, the carbon fiber anti-eccentric coupling for the sucker rod comprises a coupling main body and an anti-eccentric sleeve 3, wherein butt joints for connecting the sucker rod are arranged at two ends of the coupling main body, and the coupling main body is of a split structure and comprises a central rod 1 and a connecting seat 2; the central rod 1 is a solid rod piece, a limit ring 101 is arranged near the upper end of the central rod, and the lower end of the central rod is in threaded connection with the connecting seat 2; the eccentric wear prevention sleeve 3 is made of carbon fiber and is sleeved on the central rod 1; the both ends of eccentric wear prevention cover 3 offset with spacing ring 101 and connecting seat 2 respectively to the external diameter of eccentric wear prevention cover 3 is greater than the biggest external diameter of well core rod 1 and connecting seat 2.
In more detail, the two ends of the center rod 1 are provided with male screw joints 103, and the two ends of the connecting seat 2 are provided with female screw joints 201.
In addition, the material of this embodiment butt joint hoop main part has optimized, specifically is:
the coupling main body material of this embodiment chooses for use 20crmo, 35crmo or any one in the stainless steel, and its shock resistance, bending resistance, corrosion resisting capability are strong, and this part is direct not with oil pipe contact, generally does not have wearing and tearing when normal use, and the operation is qualified through detecting reuse after the play.
EXAMPLE III
Referring to fig. 1-2, the carbon fiber anti-eccentric coupling for the sucker rod comprises a coupling body and an anti-eccentric sleeve 3, wherein butt joints for connecting the sucker rod are arranged at two ends of the coupling body, the coupling body is of a split structure and is made of any one of 20crmo, 35crmo or stainless steel, and the coupling body comprises a center rod 1 and a connecting seat 2; the central rod 1 is a solid rod piece, a limit ring 101 is arranged near the upper end of the central rod, and the lower end of the central rod is in threaded connection with the connecting seat 2; the eccentric wear prevention sleeve 3 is made of carbon fiber and is sleeved on the central rod 1; the both ends of eccentric wear prevention cover 3 offset with spacing ring 101 and connecting seat 2 respectively to the external diameter of eccentric wear prevention cover 3 is greater than the biggest external diameter of well core rod 1 and connecting seat 2.
In more detail, the two ends of the center rod 1 are provided with male screw joints 103, and the two ends of the connecting seat 2 are provided with female screw joints 201.
The present embodiment is different from the second embodiment in that: set up 3 fixed establishment on eccentric wear prevention cover in this embodiment, specifically do:
referring to fig. 2-3, an axial positioning key 301 is arranged on the inner wall of the eccentric wear prevention sleeve 3, and an inner key groove 102 matched with the positioning key 301 is arranged on the central rod 1; further, the positioning keys 301 on the inner wall of the eccentric wear prevention sleeve 3 are provided with a plurality of positioning keys and are arranged in a circumferential array, and correspondingly, the inner key grooves 102 on the central rod 1 are also provided with a plurality of positioning keys and are arranged in one-to-one correspondence with the positioning keys 301.
When the eccentric wear prevention sleeve 3 is installed, the inner key groove 102 in the central rod 1 accurately corresponds to the positioning key 301 of the eccentric wear prevention sleeve 3, the eccentric wear prevention sleeve 3 is tightly attached to the central rod 1 after installation, and the inner key groove 102 in the central rod 1 plays a role in fixing the eccentric wear prevention sleeve 3.
Example four
Referring to fig. 1-2, the carbon fiber anti-eccentric coupling for the sucker rod comprises a coupling body and an anti-eccentric sleeve 3, wherein butt joints for connecting the sucker rod are arranged at two ends of the coupling body, the coupling body is of a split structure and is made of any one of 20crmo, 35crmo or stainless steel, and the coupling body comprises a center rod 1 and a connecting seat 2; the central rod 1 is a solid rod piece, a limit ring 101 is arranged near the upper end of the central rod, and the lower end of the central rod is in threaded connection with the connecting seat 2; the eccentric wear prevention sleeve 3 is made of carbon fiber and is sleeved on the central rod 1; the both ends of eccentric wear prevention cover 3 offset with spacing ring 101 and connecting seat 2 respectively to the external diameter of eccentric wear prevention cover 3 is greater than the biggest external diameter of well core rod 1 and connecting seat 2.
In more detail, the two ends of the center rod 1 are provided with male screw joints 103, and the two ends of the connecting seat 2 are provided with female screw joints 201.
Referring to fig. 2-3, an axial positioning key 301 is arranged on the inner wall of the eccentric wear prevention sleeve 3, and an inner key groove 102 matched with the positioning key 301 is arranged on the central rod 1; further, the positioning keys 301 on the inner wall of the eccentric wear prevention sleeve 3 are provided with a plurality of positioning keys and are arranged in a circumferential array, and correspondingly, the inner key grooves 102 on the central rod 1 are also provided with a plurality of positioning keys and are arranged in one-to-one correspondence with the positioning keys 301.
The present embodiment is different from the third embodiment in that: this embodiment has optimized the structure of preventing eccentric wear cover 3, specifically is:
the eccentric wear prevention sleeve 3 is the part with the largest coupling outer diameter, the outer contour of the cross section of the eccentric wear prevention sleeve 3 in the embodiment is designed in a circular arc quadrangle mode, the design can effectively centralize the sucker rod in the oil pipe, meanwhile, the cross section area of the coupling is effectively reduced, the cross section area of the annular space of the rod pipe is increased, and the flow capacity of well fluid is improved.
EXAMPLE five
Referring to fig. 1-2, the carbon fiber anti-eccentric coupling for the sucker rod comprises a coupling body and an anti-eccentric sleeve 3, wherein butt joints for connecting the sucker rod are arranged at two ends of the coupling body, the coupling body is of a split structure and is made of any one of 20crmo, 35crmo or stainless steel, and the coupling body comprises a center rod 1 and a connecting seat 2; the central rod 1 is a solid rod piece, a limit ring 101 is arranged near the upper end of the central rod, and the lower end of the central rod is in threaded connection with the connecting seat 2; the eccentric wear prevention sleeve 3 is made of carbon fiber, the outer contour of the cross section of the eccentric wear prevention sleeve is arc-shaped quadrangle, and the eccentric wear prevention sleeve is sleeved on the central rod 1; the both ends of eccentric wear prevention cover 3 offset with spacing ring 101 and connecting seat 2 respectively to the external diameter of eccentric wear prevention cover 3 is greater than the biggest external diameter of well core rod 1 and connecting seat 2.
In more detail, the two ends of the center rod 1 are provided with male screw joints 103, and the two ends of the connecting seat 2 are provided with female screw joints 201.
Referring to fig. 2-3, an axial positioning key 301 is arranged on the inner wall of the eccentric wear prevention sleeve 3, and an inner key groove 102 matched with the positioning key 301 is arranged on the central rod 1; further, the positioning keys 301 on the inner wall of the eccentric wear prevention sleeve 3 are provided with a plurality of positioning keys and are arranged in a circumferential array, and correspondingly, the inner key grooves 102 on the central rod 1 are also provided with a plurality of positioning keys and are arranged in one-to-one correspondence with the positioning keys 301.
The present embodiment is different from the fourth embodiment in that: this embodiment has carried out optimization to the external diameter of preventing eccentric wear cover 3 and has injectd, specifically is:
referring to fig. 3, the diameter D of the eccentric wear prevention sleeve 3 is set according to the size of the oil pipe, wherein the diameters D of the eccentric wear prevention sleeves 3 corresponding to oil pipes of 73mm and 89mm are 54mm and 68mm respectively, and the diameters D of the eccentric wear prevention sleeves 3 of other specifications = the inner diameter of the oil pipe-8 mm.
EXAMPLE six
Referring to fig. 1-2, the carbon fiber anti-eccentric coupling for the sucker rod comprises a coupling body and an anti-eccentric sleeve 3, wherein butt joints for connecting the sucker rod are arranged at two ends of the coupling body, the coupling body is of a split structure and is made of any one of 20crmo, 35crmo or stainless steel, and the coupling body comprises a center rod 1 and a connecting seat 2; the central rod 1 is a solid rod piece, a limit ring 101 is arranged near the upper end of the central rod, and the lower end of the central rod is in threaded connection with the connecting seat 2; the eccentric wear prevention sleeve 3 is made of carbon fiber, the outer contour of the cross section of the eccentric wear prevention sleeve is arc-shaped quadrangle, and the eccentric wear prevention sleeve is sleeved on the central rod 1; the both ends of eccentric wear prevention cover 3 offset with spacing ring 101 and connecting seat 2 respectively to the external diameter of eccentric wear prevention cover 3 is greater than the biggest external diameter of well core rod 1 and connecting seat 2.
In more detail, the two ends of the center rod 1 are provided with male screw joints 103, and the two ends of the connecting seat 2 are provided with female screw joints 201.
Referring to fig. 2-3, an axial positioning key 301 is arranged on the inner wall of the eccentric wear prevention sleeve 3, and an inner key groove 102 matched with the positioning key 301 is arranged on the central rod 1; further, the positioning keys 301 on the inner wall of the eccentric wear prevention sleeve 3 are provided with a plurality of positioning keys and are arranged in a circumferential array, and correspondingly, the inner key grooves 102 on the central rod 1 are also provided with a plurality of positioning keys and are arranged in one-to-one correspondence with the positioning keys 301.
Referring to fig. 3, the diameter D of the eccentric wear prevention sleeve 3 is set according to the size of the oil pipe, wherein the diameters D of the eccentric wear prevention sleeves 3 corresponding to oil pipes of 73mm and 89mm are 54mm and 68mm respectively, and the diameters D of the eccentric wear prevention sleeves 3 of other specifications = the inner diameter of the oil pipe-8 mm.
The present embodiment is different from the fifth embodiment in that: the structure of the eccentric wear prevention sleeve 3 is further optimized in the embodiment, specifically:
referring to fig. 3, in this embodiment, the two ends of the anti-eccentric sleeve 3 are both provided with round corners at the outer edges, so that the impact force between the coupling and the tubing can be effectively reduced, and the friction between the tubing and the anti-eccentric sleeve 3 can be effectively reduced.
EXAMPLE seven
Referring to fig. 1-2, the carbon fiber anti-eccentric coupling for the sucker rod comprises a coupling body and an anti-eccentric sleeve 3, wherein butt joints for connecting the sucker rod are arranged at two ends of the coupling body, the coupling body is of a split structure and is made of any one of 20crmo, 35crmo or stainless steel, and the coupling body comprises a center rod 1 and a connecting seat 2; the central rod 1 is a solid rod piece, a limit ring 101 is arranged near the upper end of the central rod, and the lower end of the central rod is in threaded connection with the connecting seat 2; the eccentric wear prevention sleeve 3 is made of carbon fiber, the outer contour of the cross section of the eccentric wear prevention sleeve is arc-shaped quadrangle, and the eccentric wear prevention sleeve is sleeved on the central rod 1; two ends of the eccentric wear prevention sleeve 3 are respectively abutted against the limiting ring 101 and the connecting seat 2, and the outer diameter of the eccentric wear prevention sleeve 3 is larger than the maximum outer diameters of the central rod 1 and the connecting seat 2; in addition, in order to reduce the impact force between the coupling and the oil pipe, the outer edges of the two ends of the eccentric wear prevention sleeve 3 are provided with round corners.
In more detail, the two ends of the center rod 1 are provided with male screw joints 103, and the two ends of the connecting seat 2 are provided with female screw joints 201.
Referring to fig. 2-3, an axial positioning key 301 is arranged on the inner wall of the eccentric wear prevention sleeve 3, and an inner key groove 102 matched with the positioning key 301 is arranged on the central rod 1; further, the positioning keys 301 on the inner wall of the eccentric wear prevention sleeve 3 are provided with a plurality of positioning keys and are arranged in a circumferential array, and correspondingly, the inner key grooves 102 on the central rod 1 are also provided with a plurality of positioning keys and are arranged in one-to-one correspondence with the positioning keys 301.
Referring to fig. 3, the diameter D of the eccentric wear prevention sleeve 3 is set according to the size of the oil pipe, wherein the diameters D of the eccentric wear prevention sleeves 3 corresponding to oil pipes of 73mm and 89mm are 54mm and 68mm respectively, and the diameters D of the eccentric wear prevention sleeves 3 of other specifications = the inner diameter of the oil pipe-8 mm.
The present embodiment is different from the sixth embodiment in that: the structure of the eccentric wear prevention sleeve 3 is further optimized in the embodiment, specifically:
referring to fig. 4, in order to further reduce the cross-sectional area of the coupling and improve the flow capacity of well fluid, a plurality of axial flow channels 302 are arranged in the pipe wall of the eccentric wear prevention sleeve 3, and the flow channels 302 are uniformly distributed along the circumferential direction of the eccentric wear prevention sleeve 3.
The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention, and the contents of the changes still fall within the scope of the present invention.
Claims (8)
1. The utility model provides a sucker rod carbon fiber anti-eccentric coupling which characterized in that: the coupling comprises a coupling body and an eccentric wear prevention sleeve, wherein butt joints for connecting a sucker rod are arranged at two ends of the coupling body, and the coupling body is of a split structure and comprises a central rod and a connecting seat; the central rod is a solid rod piece, a limit ring is arranged near the upper end of the central rod, and the lower end of the central rod is detachably connected with the connecting seat; the eccentric wear prevention sleeve is made of carbon fiber and is sleeved on the central rod; the two ends of the eccentric wear prevention sleeve are respectively abutted against the limiting ring and the connecting seat, and the outer diameter of the eccentric wear prevention sleeve is larger than the maximum outer diameters of the central rod and the connecting seat.
2. The sucker rod carbon fiber anti-eccentric coupling of claim 1, which is characterized in that: the coupling main body is made of any one of 20crmo, 35crmo or stainless steel.
3. The sucker rod carbon fiber anti-eccentric coupling of claim 1, which is characterized in that: the inner wall of the eccentric wear prevention sleeve is provided with an axial positioning key, and the central rod is provided with an inner key groove matched with the positioning key.
4. The sucker rod carbon fiber anti-eccentric coupling of claim 3, which is characterized in that: the positioning keys on the inner wall of the eccentric wear prevention sleeve are provided with a plurality of positioning keys which are arranged in a circumferential array, correspondingly, the inner key groove on the central rod is also provided with a plurality of positioning keys which are arranged in a one-to-one correspondence manner.
5. The sucker rod carbon fiber anti-eccentric coupling of claim 1, which is characterized in that: the two ends of the central rod are provided with external thread joints, the two ends of the connecting seat are provided with internal thread joints, and the lower end of the central rod is in threaded connection with the connecting seat.
6. The sucker rod carbon fiber anti-eccentric coupling of claim 1, which is characterized in that: the cross section outline of the eccentric wear prevention sleeve is a circular arc quadrangle.
7. The sucker rod carbon fiber anti-eccentric coupling of claim 1 or 6, which is characterized in that: the diameter D of the eccentric wear prevention sleeve is set according to the size of the oil pipe, wherein the diameters D of the eccentric wear prevention sleeve corresponding to the oil pipes of 73mm and 89mm are respectively 54mm and 68mm, and the diameters D of the eccentric wear prevention sleeves of other specifications = the inner diameter of the oil pipe-8 mm.
8. The sucker rod carbon fiber anti-eccentric coupling of claim 1, which is characterized in that: and the outer edges of the two ends of the eccentric wear prevention sleeve are provided with round corners.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122070072.1U CN215672074U (en) | 2021-08-31 | 2021-08-31 | Sucker rod carbon fiber eccentric wear prevention coupling |
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| CN202122070072.1U CN215672074U (en) | 2021-08-31 | 2021-08-31 | Sucker rod carbon fiber eccentric wear prevention coupling |
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| CN215672074U true CN215672074U (en) | 2022-01-28 |
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| CN202122070072.1U Active CN215672074U (en) | 2021-08-31 | 2021-08-31 | Sucker rod carbon fiber eccentric wear prevention coupling |
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