Eccentric wear prevention ball centering type sucker rod

Abstract

An anti-eccentric-wear ball centralizing sucker rod relates to the technical field of sucker rods and comprises a sucker rod, a centralizer is fixedly arranged on the sucker rod in an injection molding manner, a plurality of spiral flow guide ribs are arranged on the peripheral wall of the centralizer, flow guide channels are formed through areas between the adjacent flow guide ribs, each flow guide rib is provided with an installation groove in a shape following manner, and the installation grooves are communicated with the centralizer. A communicated access channel is formed in one end of the mounting groove, the mounting groove is filled with a plurality of balls through the access channel, and a closed structure for connecting and disconnecting the access channel is connected into the access channel. The utility model solves the problems that as the centralizer in the prior art is used, the balls are easy to wear and lose efficacy, so that the centralizer needs to be replaced together, and the maintenance cost is increased; the problems that when the centralizer is used, due to abrasion of the balls, the distance between the adjacent balls is increased, the balls are prone to colliding in the lifting process of the sucker rod, and then abrasion failure is aggravated are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sucker rods, in particular to an anti-eccentric wear ball-supported sucker rod. Background Art

[0002] There are various types of sucker rod centralizers currently in use in oil wells, and the following problems are common: the grooves of the centralizer body of existing centralizers are mostly straight grooves, which are easily worn on one side during the up and down sliding friction process, resulting in uneven wear of the centralizer body; the centralizer relies solely on the wear body to maintain its centralizing function. As the usage cycle increases, the centralizer body wears severely, has a short service life, and thus cannot effectively prevent uneven wear.

[0003] The prior art discloses a patent CN205577882U, which includes a center rod with threads on both ends of the center rod. A stabilizing sleeve is sleeved on the center rod, and a plurality of grooves are provided on the outer surface of the stabilizing sleeve. The grooves are distributed in a spiral shape, and a plurality of pairs of balls are provided in each groove. A spring washer is provided between each pair of balls to make the stabilizing body easier to rotate and ensure uniform wear of the stabilizing body.

[0004] As existing devices including the above patents are used, the shortcomings of the technology are gradually exposed, mainly in the following aspects:

[0005] First, the existing centralizers are prone to wear and failure as the balls are used, which requires replacement of the centralizer together, increasing maintenance costs.

[0006] Second, as the centralizer is used, the balls wear out, which increases the distance between adjacent balls. This causes the balls to collide easily during the lifting process of the sucker rod, further exacerbating the problem of wear and failure.

[0007] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Utility Model Content

[0008] In response to the defects in the existing technology, the utility model solves the problems in the traditional technology that the balls of the centralizer are prone to wear and failure during use, resulting in the need to replace the centralizer together, increasing maintenance costs; and the balls of the centralizer are prone to wear and failure during use, which increases the distance between adjacent balls, resulting in collisions between the balls during the lifting process of the sucker rod, thereby exacerbating the problem of wear and failure.

[0009] In order to solve the above problems, the present invention provides the following technical solutions:

[0010] The anti-bias wear ball-supported sucker rod includes a sucker rod, a fixed stabilizer is injection-molded on the sucker rod, a plurality of spirally arranged guide ribs are provided on the peripheral wall of the stabilizer, and a guide channel is formed through the area between adjacent guide ribs, each of the guide ribs is provided with a mounting groove, one end of the mounting groove is provided with a connected inlet and outlet channel, the mounting groove is filled with a plurality of balls through the inlet and outlet channels, and a closed structure for opening and closing the inlet and outlet channels is connected to the inlet and outlet channels.

[0011] As an optimized solution, a tensioning structure for tensioning a plurality of the balls is provided in the mounting groove.

[0012] As an optimized solution, the closing structure includes a threaded groove opened at the bottom of the inlet and outlet channel, and a limit pin is threadedly connected through the threaded groove.

[0013] As an optimized solution, the tensioning structure includes a compression spring, and the compression spring is arranged transversely inside along the extension direction of the installation slot.

[0014] As an optimized solution, one end of the compression spring abuts against the limit pin, and the other end frictionally abuts against the adjacent ball.

[0015] As an optimized solution, an arc-shaped seat is fixedly connected to one end of the compression spring facing the ball, and the arc-shaped seat is in frictional contact with the ball.

[0016] As an optimized solution, the mounting groove is arranged in an arc shape along the axial cross-section direction.

[0017] As an optimized solution, the width of the mounting groove is smaller than the diameter of the ball.

[0018] As an optimized solution, the opening of the inlet and outlet channel is larger than the diameter of the ball.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] A connecting access channel is provided at one end of the mounting slot, and the access channel is detachably connected to a limit pin, so that when the ball bearings are worn, only part of the ball bearings need to be replaced without scrapping the entire bearing, thus reducing working costs and facilitating disassembly and assembly.

[0021] By arranging a compression spring in the installation groove, the compression spring is used to adaptively tension several balls in the installation groove, overcoming the phenomenon in traditional technology where the distance between adjacent balls is too large and they collide due to ball wear, thereby improving the stability of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0023] Figure 1 It is a structural schematic diagram of the utility model in the unsealed state;

[0024] Figure 2 yes Figure 1 Schematic diagram of the structure in the AA section.

[0025] In the figure: 1- sucker rod; 2- centralizer; 3- guide rib; 4- guide channel; 5- mounting groove; 6- ball bearing; 7- inlet and outlet channel; 8- limit pin; 9- compression spring; 10- arc seat. DETAILED DESCRIPTION

[0026] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0027] like Figure 1 and Figure 2 As shown, the anti-bias wear ball-supported sucker rod includes a sucker rod 1, a fixed stabilizer 2 is injection-molded on the sucker rod 1, a plurality of spirally arranged guide ribs 3 are provided on the peripheral wall of the stabilizer 2, and a guide channel 4 is formed through the area between adjacent guide ribs 3, each guide rib 3 is provided with a mounting groove 5, and a connected inlet and outlet channel 7 is provided at one end of the mounting groove 5, and a plurality of balls 6 are filled in the inlet and outlet channel 7, and a closed structure for opening and closing the inlet and outlet channel 7 is connected therein.

[0028] A tensioning structure for tensioning a plurality of balls 6 is provided in the mounting groove 5 .

[0029] The closing structure includes a threaded groove formed at the bottom of the inlet and outlet passage 7 , and a limit pin 8 is threadedly connected to the threaded groove.

[0030] The tensioning structure includes a compression spring 9 , which is laterally arranged inside the mounting groove 5 along the extending direction thereof.

[0031] One end of the compression spring 9 abuts against the limit pin 8 , and the other end frictionally abuts against the adjacent ball 6 .

[0032] An arc-shaped seat 10 is fixedly connected to one end of the compression spring 9 facing the ball 6 , and the arc-shaped seat 10 is in friction contact with the ball 6 .

[0033] The mounting groove 5 is arranged in an arc shape along the axial cross-section direction.

[0034] The width of the mounting groove 5 is smaller than the diameter of the ball 6 .

[0035] The opening of the inlet and outlet channel 7 is larger than the diameter of the ball 6 .

[0036] The working principle of this device is:

[0037] An inlet and outlet passage 7 is provided at one end of the mounting groove 5, and the inlet and outlet passage 7 is detachably connected to a limit pin 8, so that when the balls 6 are worn, only a part of the balls 6 needs to be replaced without scrapping the entire ball bearing, thereby reducing the working cost and facilitating disassembly and assembly.

[0038] By arranging a compression spring 9 in the mounting groove 5, the compression spring 9 can be used to adaptively tension the plurality of balls 6 in the mounting groove 5, thereby overcoming the phenomenon in traditional technology where the distance between adjacent balls 6 is too large and they collide due to wear of the balls 6, thereby improving the stability of use.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. Anti-eccentric wear ball-supported sucker rod, characterized by: The invention comprises a sucker rod (1), wherein a fixed centralizer (2) is injection-molded on the sucker rod (1), a plurality of spirally arranged guide ribs (3) are provided on the peripheral wall of the centralizer (2), and a guide channel (4) is formed through the area between adjacent guide ribs (3), each of the guide ribs (3) is provided with a mounting groove (5), one end of the mounting groove (5) is provided with a connected inlet and outlet channel (7), the mounting groove (5) is filled with a plurality of balls (6) through the inlet and outlet channel (7), a closed structure for opening and closing the inlet and outlet channel (7) is connected, and a tensioning structure for tensioning the plurality of balls (6) is provided in the mounting groove (5), and the tensioning structure comprises a compression spring (9), and the compression spring (9) is arranged horizontally inside along the extension direction of the mounting groove (5).

2. The anti-eccentric wear ball-supported sucker rod according to claim 1, characterized in that: The closed structure comprises a threaded groove formed at the bottom of the inlet and outlet channel (7), and a limit pin (8) is threadedly connected to the threaded groove.

3. The anti-eccentric wear ball-supported sucker rod according to claim 2, characterized in that: One end of the compression spring (9) abuts against the limit pin (8), and the other end frictionally abuts against the adjacent ball (6).

4. The anti-eccentric wear ball-supported sucker rod according to claim 3 is characterized in that: An arc-shaped seat (10) is fixedly connected to one end of the compression spring (9) facing the ball (6), and the arc-shaped seat (10) is in frictional contact with the ball (6).

5. The anti-eccentric wear ball-supported sucker rod according to claim 4 is characterized in that: The mounting groove (5) is arranged in an arc shape along the axial cross-section direction.

6. The anti-eccentric wear ball-supported sucker rod according to claim 5, characterized in that: The width of the mounting groove (5) is smaller than the diameter of the ball (6).

7. The anti-eccentric wear ball-supported sucker rod according to claim 6, characterized in that: The opening of the inlet and outlet channel (7) is larger than the diameter of the ball (6).

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