Centralizing coupling with unloading groove and submersible linear motor

Abstract

The utility model discloses a righting coupling with an unloading groove and a submersible linear motor, and relates to the technical field of linear motors, the righting coupling with the unloading groove comprises a righting coupling piece and a connecting pipe, the righting coupling piece comprises a first connecting section and a second connecting section which are connected with each other, the first connecting section is provided with the unloading groove and a first cavity which are communicated with each other, and the second connecting section is provided with a second cavity which is communicated with the unloading groove. The connecting pipe comprises a first pipe part and a second pipe part which are connected, the first pipe part extends into the first cavity, the second pipe part and the end, away from the second connecting section, of the first connecting section are arranged in a spaced mode to form a welding gap communicating with the unloading groove, the welding gap is used for strengthening fixed connection of the coupling piece and the connecting pipe, and the welding gap is adjacent to and communicates with the unloading groove; and then the centralizing coupling piece is fixedly connected with the connecting pipe, and the stress at the fixed connection part of the centralizing coupling piece and the connecting pipe is greatly reduced by designing the unloading groove in the coupling, so that the problem that a welding seam at the fixed connection part is fractured and fails due to overlarge load is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of linear motors, in particular to a straightening coupling with an unloading groove and a submersible linear motor. Background Art

[0002] The reciprocating submersible linear electric pump adopts a rodless lifting method, which changes the commonly used rod lifting method for crude oil extraction. It has the characteristics of simple structure, energy saving and consumption reduction, easy operation, and online parameter adjustment. It completely solves the problems of sucker rod detachment, breakage, and pipe rod eccentric wear that have long plagued mechanical rod oil production at home and abroad. Submersible linear electric pumps can not only replace the original oil production method, but are also very suitable for the production of horizontal wells, directional wells, and low permeability oil wells. The reciprocating submersible electric pump is a linear motor installed at the bottom of the well, which drives the oil pump electrically. At present, reciprocating submersible electric pumps have been widely used in normal temperature wells in major oil fields.

[0003] Submersible linear motors are limited by design size requirements, and most of the joint connection threads use metric threads. For example, the couplings and connecting pipes of submersible linear motors are often welded at the coupling interfaces to prevent the threads from loosening. However, due to the presence of sharp corners at the metal welds or excessive loads, the welds can easily break and fail.

[0004] Therefore, how to avoid the problem of fracture and failure of the welds at the couplings and connecting pipes due to excessive load is a technical problem that technical personnel in this field need to solve at present. Utility Model Content

[0005] The utility model aims to provide a straightening coupling and a submersible linear motor with an unloading groove, which can avoid the problem of fracture failure of the welding seams at the coupling and the connecting pipe due to excessive load.

[0006] To achieve the above-mentioned purpose, the utility model provides a straightening coupling with a unloading groove, including a straightening coupling member and a connecting pipe, the straightening coupling member includes a first connecting section and a second connecting section connected to each other, the first connecting section is provided with a communicating unloading groove and a first cavity, the connecting pipe includes a first pipe portion and a second pipe portion connected to each other, the first pipe portion extends into the first cavity, and the second pipe portion is spaced apart from one end of the first connecting section away from the second connecting section to form a welding gap connected to the unloading groove, and the welding gap is used for fixed connection of the straightening coupling member and the connecting pipe.

[0007] Preferably, the first connecting section is a cylindrical structure, and the first connecting section is provided with a first internal thread located in the first cavity, and the outer periphery of the first tube portion is provided with a first external thread adapted to the first internal thread, so that the first tube portion is threadedly connected to the inside of the first connecting section.

[0008] Preferably, the unloading groove is located between the first internal thread and the welding gap, and the unloading groove includes a first groove body and a second groove body that are connected, the first groove body is connected to the welding gap, and the second groove body is located on a side of the first groove body away from the connecting pipe.

[0009] Preferably, the second trough body has an annular structure, and the side wall of the second trough body is an annular arc surface, and both end surfaces of the first trough body in the axial direction of the first connecting section are tangent to the annular arc surface.

[0010] Preferably, the distance between the second pipe portion and the first connecting section in the radial direction of the first connecting section is one fifth to one third of the difference between the outer circle radius and the inner circle radius of the first connecting section;

[0011] The distance of the welding gap in the axial direction of the first connecting section is greater than or equal to 1.4 times the distance between the second pipe portion and the first connecting section in the radial direction of the first connecting section;

[0012] The distance between the second groove body and the outer wall of the first connecting section is greater than or equal to one quarter of the difference between the outer circle radius and the inner circle radius of the first connecting section.

[0013] Preferably, the second connecting section is a cylindrical structure, which includes a first cylinder, a second cylinder connected to the end of the first cylinder away from the first connecting section, and a limiting protrusion located at the connection between the first cylinder and the second cylinder. The limiting protrusion is a circular ring structure and is located inside the second connecting section. A stabilizer with one end abutting against the limiting protrusion is installed in the first cylinder, and the other end of the stabilizer is flush with the inner end surface of the first cylinder away from the second cylinder.

[0014] Preferably, the centralizer and the first cylinder are interference fit.

[0015] Preferably, the connecting tube is a cylindrical structure, and the outer diameter of the first tube portion is larger than the inner diameter of the first cylinder, so that the end of the first tube portion can abut against the inner end surface of the first cylinder away from the second cylinder.

[0016] Preferably, the centralizer is a cylindrical structure, and the inner diameter of the first tube portion is smaller than the inner diameter of the first cylinder, and the inner diameter of the first tube portion is larger than the inner diameter of the centralizer, so as to limit the axial movement of the centralizer along the first cylinder.

[0017] A submersible linear motor comprises the above-mentioned righting coupling with unloading grooves.

[0018] Compared with the above-mentioned background technology, the utility model provides a straightening coupling with a unloading groove, comprising a straightening coupling member and a connecting pipe, the straightening coupling member comprising a first connecting section and a second connecting section connected to each other, the first connecting section being provided with a communicating unloading groove and a first cavity, the connecting pipe comprising a first pipe portion and a second pipe portion connected to each other, the first pipe portion extending into the first cavity, and the second pipe portion being spaced apart from one end of the first connecting section away from the second connecting section to form a welding gap connected to the unloading groove, the welding gap being used for fixed connection between the straightening coupling member and the connecting pipe.

[0019] Specifically, the first pipe portion of the connecting pipe is extended into the first cavity of the first connecting section, and the first connecting section is also provided with an unloading groove connected to the first cavity. When the first pipe portion moves to a preset position, a gap exists between the second pipe portion and one end of the first connecting section away from the second connecting section to form a welding gap, and the welding gap is adjacent to and connected to the unloading groove. Then, the fixing connection between the straightening coupling and the connecting pipe is connected. By designing an unloading groove in the coupling, the stress at the fixed connection between the straightening coupling and the connecting pipe is greatly reduced, thereby solving the problem of fracture failure of the weld at that location due to excessive load. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0021] Figure 1 A schematic structural diagram of a centralizing coupling with a discharge groove provided in an embodiment of the utility model;

[0022] Figure 2 for Figure 1 A partial enlarged view of

[0023] Figure 3 This is a schematic structural diagram of a centralizer provided in an embodiment of the utility model.

[0024] in:

[0025] 100-righting coupling, 110-first connecting section, 111-first internal thread, 120-second connecting section, 121-first cylinder, 122-second cylinder, 123-limiting protrusion, 130-unloading groove, 140-welding gap;

[0026] 200-connecting pipe;

[0027] 300-Centralizer. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] In the description of the present invention, it should be understood that the terms "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation of the present invention.

[0031] The utility model aims to provide a straightening coupling and a submersible linear motor with an unloading groove, which can avoid the problem of fracture failure of the welds at the coupling and the connecting pipe 200 due to excessive load.

[0032] See also Figures 1 to 3 To achieve the above-mentioned purpose, the utility model provides a straightening coupling with a unloading groove, including a straightening coupling 100 and a connecting pipe 200, the straightening coupling 100 includes a first connecting section 110 and a second connecting section 120 connected to each other, the first connecting section 110 is provided with a connected unloading groove 130 and a first cavity, the connecting pipe 200 includes a first pipe portion and a second pipe portion connected to each other, the first pipe portion extends into the first cavity, and the second pipe portion is spaced apart from one end of the first connecting section 110 away from the second connecting section 120 to form a welding gap 140 connected to the unloading groove 130, and the welding gap 140 is used for fixed connection of the straightening coupling 100 and the connecting pipe 200.

[0033] It should be noted that, in the present embodiment, the straightening coupling 100 and the connecting pipe 200 are both metal parts and are both one-piece structures. The straightening coupling 100 and the connecting pipe 200 are both hollow structures, and the straightening coupling 100 is partially sleeved on a part of the connecting pipe 200 and then fixed to complete the connection between the straightening coupling 100 and the connecting pipe 200. In the present embodiment, the first connecting section 110 in the straightening coupling 100 and the first pipe portion of the connecting pipe 200 are preferably the above-mentioned sleeve portion and the sleeved portion.

[0034] The first pipe portion of the connecting pipe 200 is extended into the first cavity of the first connecting section 110. The first connecting section 110 is also provided with an unloading groove 130 connected to the first cavity. When the first pipe portion moves to a preset position, a gap exists between the second pipe portion and the end of the first connecting section 110 away from the second connecting section 120 to form a welding gap 140. The welding gap 140 is adjacent to and connected to the unloading groove 130. Then, the fixing connection between the straightening coupling 100 and the connecting pipe 200 is greatly reduced by designing the unloading groove 130 in the coupling, thereby solving the problem of fracture failure of the weld at that location due to excessive load.

[0035] In this embodiment, the first connecting section 110 is a cylindrical structure, and the first connecting section 110 is provided with a first internal thread 111 located in the first cavity, and the outer periphery of the first tube portion is provided with a first external thread adapted to the first internal thread 111, so that the first tube portion is threadedly connected to the interior of the first connecting section 110.

[0036] The first internal thread 111 is arranged on a part of the inner wall of the first connecting section 110. Considering the communication between the unloading groove 130, the welding gap 140 and the first cavity, the first internal thread 111 is arranged on the inner wall of the first connecting section 110 away from the open end to avoid the unloading groove 130 and the welding gap 140 located at the open end of the first connecting section 110. The first pipe portion is provided with a first external thread. Through the thread matching of the first external thread and the first internal thread 111, the connecting pipe 200 can be rotated into the first connecting section 110. The outer diameter D2 of the first connecting section 110 is generally the standard outer diameter of the oil pipe coupling, and the diameter of the outer contour of the welding gap 140 is as follows: Figure 1 As shown in D1, according to the sizes of D1 and D2, a suitable weld height (the radial distance between the second pipe portion and the end of the first connecting section 110 away from the second connecting section 120) can be selected. Preferably, the radial distance between the second pipe portion and the first connecting section 110 in the first connecting section 110 is one-fifth to one-third of the difference between the outer circle radius and the inner circle radius of the first connecting section 110, and the distance of the welding gap 140 in the axial direction of the first connecting section 110 is greater than or equal to 1.4 times the distance between the second pipe portion and the first connecting section 110 in the radial direction of the first connecting section 110, and the distance L of the welding gap 140 in the axial direction of the first connecting section 110 is preferably greater than 1.5 mm.

[0037] Among them, the unloading groove 130 is located between the first internal thread 111 and the welding gap 140, and the unloading groove 130 includes a first groove body and a second groove body that are connected. The first groove body is connected to the welding gap 140, and the second groove body is located on the side of the first groove body away from the connecting pipe 200. The outer shape of the second groove body is a circular ring structure, and the side wall of the second groove body is a circular ring arc surface. The two end faces of the first groove body in the axial direction of the first connecting section 110 are tangent to the circular ring arc surface.

[0038] It can be understood that the outer contours of the second trough body and the first trough body are tangent, and the connection is a smooth arc surface, which can effectively avoid the concentration of stress at the connection between the outer contours of the second trough body and the first trough body. The width of the unloading groove 130 in the axial direction of the first connecting section 110 is the arc diameter corresponding to the second trough body. In this embodiment, the arc diameter corresponding to the second trough body is as follows: Figure 2 M is shown, the arc radius corresponding to the second groove body is N, L+M is the distance between the root of the first internal thread 111 and the end face of the first connecting section 110, and generally, the larger M and N are, the better the unloading effect of the unloading groove 130 is. Considering that the arc of the second groove body is subjected to greater stress, the bottom of the unloading groove 130 to the outer diameter of the first connecting section 110 must have sufficient thickness H and strength to ensure that it will not fail. The distance between the second groove body and the outer wall of the first connecting section 110 is greater than or equal to one-fourth of the difference between the outer radius and the inner radius of the first connecting section 110.

[0039] In this embodiment, the second connecting section 120 is a cylindrical structure, and the second connecting section 120 includes a first cylinder 121, a second cylinder 122 connected to the end of the first cylinder 121 away from the first connecting section 110, and a limiting protrusion 123 located at the connection between the first cylinder 121 and the second cylinder 122. The limiting protrusion 123 is a circular ring structure and is located inside the second connecting section 120. A stabilizer 300 with one end abutting against the limiting protrusion 123 is installed in the first cylinder 121, and the other end of the stabilizer 300 is flush with the inner end surface of the first cylinder 121 away from the second cylinder 122.

[0040] The centralizer 300 is a tool with an anti-skew function, and its material is mainly cemented carbide. Since the linear motor rotor will have eccentric wear during the linear reciprocating operation, the centralizer 300 needs to be installed at the coupling to reduce the eccentric wear.

[0041] The centralizer 300 and the first cylinder 121 are interference fit. After the centralizer 300 is installed until one end abuts against the limiting protrusion 123, the connecting pipe 200 is rotated into the first connecting section 110, and then the connecting pipe 200 is fixed by corner welding at the welding gap 140.

[0042] The connecting tube 200 is a cylindrical structure, and the outer diameter of the first tube portion is larger than the inner diameter of the first cylinder 121, so that the end of the first tube portion can abut against the inner end surface of the first cylinder 121 away from the second cylinder 122 to prevent the first tube portion from going too deep.

[0043] The centralizer 300 is of a cylindrical structure, and the inner diameter of the first pipe portion is smaller than the inner diameter of the first cylinder 121, so that a part of the first pipe portion does not directly contact the inner end face of the first cylinder 121. The inner diameter of the first pipe portion is larger than the inner diameter of the centralizer 300, so that the part of the first pipe portion that does not directly contact the inner end face of the first cylinder 121 can limit the axial movement of the centralizer 300 along the first cylinder 121, making the position of the centralizer 300 relatively fixed.

[0044] This embodiment further includes a submersible linear motor, which includes the centralizer collar having the unloading groove 130 as described above, and also has the beneficial effects of the centralizer collar having the unloading groove 130 as described above.

[0045] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0046] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0047] Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A centralizing coupling with unloading grooves, characterized in that, The invention comprises a straightening coupling (100) and a connecting pipe (200), wherein the straightening coupling (100) comprises a first connecting section (110) and a second connecting section (120) connected to each other, wherein the first connecting section (110) is provided with a communicating unloading groove (130) and a first cavity, and the connecting pipe (200) comprises a first pipe portion and a second pipe portion connected to each other, wherein the first pipe portion extends into the first cavity, and the second pipe portion is spaced apart from an end of the first connecting section (110) away from the second connecting section (120) to form a welding gap (140) connected to the unloading groove (130), and the welding gap (140) is used for fixed connection between the straightening coupling (100) and the connecting pipe (200).

2. The centralizing coupling with a unloading groove according to claim 1, wherein, The first connecting section (110) is a cylindrical structure, and the first connecting section (110) is provided with a first internal thread (111) located in the first cavity, and the outer periphery of the first tube portion is provided with a first external thread adapted to the first internal thread (111), so that the first tube portion is threadedly connected to the inside of the first connecting section (110).

3. The centralizing coupling with a unloading groove according to claim 2, characterized in that, The unloading groove (130) is located between the first internal thread (111) and the welding gap (140), and the unloading groove (130) comprises a first groove body and a second groove body which are connected to each other, the first groove body is connected to the welding gap (140), and the second groove body is located on a side of the first groove body which is away from the connecting pipe (200).

4. The centralizing collar with unloading groove according to claim 3, wherein The second trough body has an outer shape of a circular ring structure, and the side wall of the second trough body is a circular ring arc surface, and the two end surfaces of the first trough body in the axial direction of the first connecting section (110) are tangent to the circular ring arc surface.

5. The centralizing coupling with a relief groove according to claim 4, characterized in that: The distance between the second tube portion and the first connecting section (110) in the radial direction of the first connecting section (110) is one fifth to one third of the difference between the outer circle radius and the inner circle radius of the first connecting section (110); The distance of the welding gap (140) in the axial direction of the first connecting section (110) is greater than or equal to 1.4 times the distance between the second pipe portion and the first connecting section (110) in the radial direction of the first connecting section (110); The distance between the second groove body and the outer wall of the first connecting section (110) is greater than or equal to one quarter of the difference between the outer circle radius and the inner circle radius of the first connecting section (110).

6. The centralizing coupling with unloading groove according to claim 2, wherein The second connecting section (120) is a cylindrical structure, comprising a first cylinder (121), a second cylinder (122) connected to an end of the first cylinder (121) facing away from the first connecting section (110), and a limiting protrusion (123) located at the connection between the first cylinder (121) and the second cylinder (122), wherein the limiting protrusion (123) is a circular ring structure and is located inside the second connecting section (120), and a centralizer (300) having one end abutting against the limiting protrusion (123) is installed inside the first cylinder (121), and the other end of the centralizer (300) is flush with the inner end surface of the first cylinder (121) facing away from the second cylinder (122).

7. The centralizing coupling with unloading grooves according to claim 6, wherein, The centralizer (300) and the first cylinder (121) are in interference fit.

8. The centralizer collar with unloading grooves according to claim 6, characterized in that, The connecting tube (200) is a cylindrical structure, and the outer diameter of the first tube portion is greater than the inner diameter of the first cylinder (121), so that the end of the first tube portion can abut against the inner end surface of the first cylinder (121) facing away from the second cylinder (122).

9. The centralizer collar with unloading grooves according to claim 8, wherein, The centralizer (300) is a cylindrical structure, and the inner diameter of the first tube portion is smaller than the inner diameter of the first cylinder (121), and the inner diameter of the first tube portion is larger than the inner diameter of the centralizer (300), so as to limit the axial movement of the centralizer (300) along the first cylinder (121).

10. A submersible linear motor, characterized in that, It comprises a straightening coupling with a unloading groove as claimed in any one of claims 1 to 9.

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