Sucker rod connector and sucker rod structure

Abstract

The sucker rod connector comprises a barrel, the top of the barrel is open, the lower portion of the barrel is provided with a glue injection hole communicated with the interior of the barrel, the bottom of the barrel protrudes inwards to form an annular and coaxial positioning sleeve, and the thickness of the positioning sleeve is not larger than 1 mm; a plurality of annular grooves are formed in the cylinder body from top to bottom in sequence in a concave manner, and the annular grooves form first inclined surfaces which are gradually inclined towards the outer side surface of the cylinder body from top to bottom. The positioning structure is arranged to position the carbon fiber resin rod, it is guaranteed that the sucker rod structure and the barrel are coaxially arranged, so that the size consistency of circumferential gaps is achieved, the annular groove is provided with the first inclined face, the contact area between the annular groove and viscose is increased, part of pulling force can be decomposed into pushing force towards the outer side of the barrel, and the service life of the sucker rod is prolonged. Therefore, under the condition that the length of the cylinder body is not changed, the bearable maximum tension is increased; the glue injection hole and the exhaust hole are formed in the bottom, so that glue injection and exhaust are facilitated, and bubbles are avoided during glue injection.

Description

Technical Field

[0001] The utility model belongs to the field of machinery, and particularly relates to a sucker rod connecting joint and a sucker rod structure. Background Technique

[0002] Sucker rods are usually connected to connectors through adhesives to form a sucker rod structure. Specifically, a rotatable anti-loosening joint for a carbon fiber sucker rod disclosed in CN 205277325U. However, the existing connectors are usually cylindrical structures, which are bonded to the carbon fiber resin rod through adhesives. When in use, the plunger pump drives it to move up and down, receiving great tensile and compressive forces, resulting in a great longitudinal shear force on the bonding surface between the adhesive and the carbon fiber resin rod. Therefore, extremely high requirements are imposed on the maximum tensile force that can be borne after the carbon fiber resin rod is bonded to the connector. Currently, the common method to increase the maximum tensile force is to increase the length of the connector, which leads to high costs.

[0003] Since the strength of the adhesive after solidification is lower than that of the carbon fiber resin rod, the distance between the carbon fiber resin rod and the inner wall of the connector will also greatly affect the maximum tensile force it can bear. When the distance is greater than 1 mm, the tensile force that can be borne will decrease sharply. According to experiments, a distance of 0.5 mm is a more appropriate distance. However, the current glue injection method is to first inject glue into the connector and then insert the carbon fiber resin rod. However, due to the high viscosity and poor fluidity of the adhesive and the small gap between the carbon fiber resin rod and the inner wall of the connector, it is extremely difficult to insert the carbon fiber resin rod. In addition, it is also difficult to ensure that the carbon fiber resin rod is coaxially arranged with the connector, so as to keep the distance from its inner wall uniform. Therefore, improvement is needed. Content of the Utility Model

[0004] To solve the above technical problems, the utility model provides a sucker rod connecting joint and a sucker rod structure. The purpose of the utility model is achieved through the following technical solutions:

[0005] A sucker rod connecting joint includes a cylinder body. The top of the cylinder body is open, and a glue injection hole communicating with the inside of the cylinder body is opened at the lower part. An annular positioning sleeve coaxial with the cylinder body is formed by inward convexity at the bottom of the cylinder body, and the thickness of the positioning sleeve is not greater than 1 mm. Inside the cylinder body, a plurality of annular grooves are formed by outward concavity in sequence from top to bottom. The annular grooves form a first inclined surface that gradually inclines from top to bottom towards the outer side surface of the cylinder body.

[0006] Further improvement: The inner side surface at the top of the positioning sleeve is an inclined guiding surface.

[0007] Further improvement: A wrench square is connected to the bottom end of the cylinder body.

[0008] Further improvement: The thickness of the positioning sleeve is 0.5 mm.

[0009] Further improvement: An exhaust hole running through all the annular grooves is formed by the inner concave surface of the cylinder body.

[0010] Further improvement: The distance between adjacent annular grooves is a fixed distance.

[0011] Further improvement: A glue storage groove is formed by the inner depression of the top of the cylinder body.

[0012] A sucker rod structure, which includes a carbon fiber resin rod inserted into the above-mentioned cylinder body and bonded and fixed to the cylinder body through adhesive.

[0013] The beneficial effects of the present utility model are as follows:

[0014] 1. The present utility model sets a positioning structure to position the carbon fiber resin rod, ensuring that the sucker rod structure and the cylinder body are coaxially arranged, so as to make the circumferential clearance size consistent.

[0015] 2. The first inclined surface is set, which not only increases the contact area with the adhesive, but also can decompose a part of the tensile force into a thrust force towards the outside of the cylinder body, thereby increasing the maximum tensile force that can be borne without changing the length of the cylinder body.

[0016] 3. The glue injection hole is set at the bottom, and the exhaust hole is set, so as to facilitate glue injection and exhaust, and avoid air bubbles during glue injection. Description of the Drawings

[0017] The present utility model is further described with the accompanying drawings, but the content in the drawings does not constitute any limitation to the present utility model.

[0018] Figure 1 It is a schematic cross-sectional structure diagram of the present utility model;

[0019] Figure 2 It is a schematic top view structure diagram of the present utility model. Detailed Embodiments

[0020] In order to make the purpose, technical solutions and advantages of the utility model more clear, the following further detailed description of the present utility model is given in conjunction with the accompanying drawings and examples.

[0021] Embodiment 1

[0022] The following further detailed description of the specific implementation manners, structures and features of a sucker rod connection joint and a sucker rod structure proposed according to the present utility model is given in conjunction with the accompanying drawings and preferred embodiments. The accompanying drawings involved only illustrate some embodiments of the present utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other relevant information can also be obtained according to the accompanying drawings in combination with specific cases and their own technical levels.

[0023] AsFigure 1-2 A sucker rod connection joint as shown, comprising a cylinder body 1, a glue injection hole 2, a positioning sleeve 3, an inclined guiding surface 31, an annular groove 4, a first inclined surface 41, a wrench square 5, an exhaust hole 6, a glue storage groove 7, and a carbon fiber resin rod 8.

[0024] Among them, the glue injection hole 2 is located at the lower part of the cylinder body 1, and the annular groove 4 is located on the inner wall of the cylinder body 1 and is evenly arranged from top to bottom. The annular groove 4 forms a first inclined surface 41 that gradually inclines from top to bottom towards the outer side surface of the cylinder body 1.

[0025] The positioning sleeve 3 is located at the bottom of the cylinder body 1 and is coaxially arranged with the cylinder body 1. The inner side surface at the top of the positioning sleeve 3 is an inclined guiding surface 31.

[0026] During use, first insert the carbon fiber resin rod 8 into the positioning sleeve 3 of the cylinder body 1. The inclined guiding surface 31 is used for guiding and positioning to ensure that the carbon fiber resin rod is coaxial with the cylinder body 1, thereby forming a gap of approximately 0.5 mm. Then inject glue through the glue injection hole 2 until the glue reaches the glue storage groove 7 at the top of the cylinder body 1. The purpose of the glue storage groove 7 is that there will be a certain shrinkage when the glue solidifies. Therefore, an additional part of the glue is stored here, so that the glue in the gap will not be insufficient after the glue solidifies and fail to reach the preset maximum bearing tensile force.

[0027] The annular groove 4 forms a first inclined surface 41 that gradually inclines from top to bottom towards the outer side surface of the cylinder body 1. Its purpose is that when the carbon fiber resin rod 8 is subjected to tension, the glue in the annular groove 4 converts the tension into an inclined pressure on the cylinder body 1, thereby decomposing it into an upward component force and an outward component force, so as to increase its maximum bearing tensile force without extending the cylinder body 1. For the convenience of processing, another inclined surface is formed on the first inclined surface 41 of the annular groove 4, so that its overall cross-section is in a √ shape.

[0028] Furthermore, for the convenience of exhausting air during glue injection, the inner side surface of the cylinder body 1 is recessed to form a longitudinal through all the rings.

[0029] 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 the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A sucker rod connection joint, comprising a barrel (1), characterized in that: The cylinder (1) is open at the top and has a glue injection hole (2) in communication with the interior of the cylinder (1) at the bottom. The bottom of the cylinder (1) is convexly formed with an annular positioning sleeve (3), and the thickness of the positioning sleeve (3) is not greater than 1 mm. The interior of the cylinder (1) is concavely formed with a plurality of annular grooves (4) from top to bottom, and the annular grooves (4) form a first inclined surface (41) that gradually inclines from top to bottom toward the outer side surface of the cylinder (1).

2. The sucker rod connection joint according to claim 1, characterized in that: The inner side surface of the top of the positioning sleeve (3) is an inclined guide surface (31).

3. The sucker rod connection joint according to claim 1, characterized in that: The bottom end of the cylinder (1) is connected to a wrench (5).

4. The sucker rod connection joint according to claim 1, characterized in that: The positioning sleeve (3) has a thickness of 0.5 mm.

5. The sucker rod connection joint according to claim 1, characterized in that: The inner side surface of the cylinder (1) is concavely formed with an exhaust hole (6) that vertically passes through all the annular grooves (4).

6. The sucker rod connection joint according to claim 1, characterized in that: The distance between adjacent annular grooves (4) is a fixed distance.

7. The sucker rod connection joint according to claim 1, characterized in that: The top inner side of the cylinder (1) is concave to form a glue storage tank (7).

8. A sucker rod structure, characterized in that: The sucker rod structure comprises a carbon fiber resin rod (8), which is inserted into the cylinder (1) described in any one of claims 1 to 7 and is bonded and fixed to the cylinder (1) by adhesive.

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