Special-shaped pipe expander

Abstract

The special-shaped pipe expander comprises a main body, a connecting part is arranged at the tail end of the main body, two first arc-shaped grooves are formed in the outer cylindrical wall of the front end of the main body at an interval of 180 degrees in the circumferential direction of the main body, the long diameter direction of each first arc-shaped groove is the same as the axial direction of the main body, and the short diameter direction of each first arc-shaped groove faces the center of the main body; the second arc-shaped grooves are formed in the circumferential direction of the outer wall of the main body at intervals of 180 degrees, the second arc-shaped grooves are formed in the outer wall of the main body in the direction from the first arc-shaped grooves to the connecting part, and the second arc-shaped grooves and the first arc-shaped grooves are formed in the circumferential direction of the main body at intervals of 90 degrees; the long-diameter direction of the second arc-shaped groove is the same as the axial direction of the main body, and the short-diameter direction of the second arc-shaped groove faces the center of the main body; and the front end of the main body is provided with an expansion cone platform. The pipe expanding device has the advantages that the structure is simple, cold hardening of pipe fittings can be effectively reduced, and pipe expanding can be achieved through axial static pressure or impact feeding or / and circumferential rotation or impact rotation.

Description

Technical Field

[0001] The utility model relates to the field of petroleum tools, in particular to a special-shaped tube expander. Background Art

[0002] When the pear-shaped expander is used, the axial force is used to support and squeeze the inner wall of the deformed casing, so that it can be restored to its original size. However, the working surface of the traditional pear-shaped expander is annular when working, so the resistance encountered during the expansion is greater. In response to this problem, Chinese patent CN03213313.8 discloses a ball-type multi-stage expander, including a shaft with threads at both ends, characterized in that: an upper joint and a conical guide shoe are respectively connected to the upper and lower ends of the shaft, and a conical shaping section is set in the middle of the shaft, and the shaping section is composed of a plurality of tapered ball bearing frames, and each ball bearing frame has a plurality of tapered guide shoes. A spherical groove is provided adjacent to the end surface of the support frame, and a ball is installed in the spherical groove; although the patent adopts a multi-stage method to expand the casing step by step, the contact area with the casing during operation is smaller than that of the pear-shaped expander, so the resistance is greatly reduced, but when the structure is expanding the tube, the ball will continuously squeeze the inner wall of the casing, and over time, the casing will undergo cold work hardening, the hardness of the inner wall of the casing will increase, the toughness will decrease, and it will be easy to peel off or crack. At the same time, when the ball squeezes the inner wall of the casing, the cylindricity of the casing will continue to change, which will easily cause metal fatigue and create safety hazards. Summary of the invention

[0003] Based on the above problems, the utility model aims to provide a special-shaped tube expander with a simple structure, which can effectively reduce the cold work hardening of pipe fittings and can achieve tube expansion through axial static pressure or impact feeding, and / or through circumferential rotation or impact rotation.

[0004] In response to the above problems, the following technical solutions are provided: a special-shaped tube expander, comprising a main body, a connecting portion being provided at the rear end of the main body, and two first arc-shaped grooves being provided on the outer cylindrical wall at the front end of the main body at intervals of 180 degrees along its circumferential direction, the major diameter direction of the first arc-shaped groove being in the same direction as the axial direction of the main body, and the minor diameter direction being toward the center of the main body; further comprising second arc-shaped grooves being provided at intervals of 180 degrees along the circumferential direction of the outer wall of the main body, the second arc-shaped grooves being located on the outer wall of the main body in the direction of the first arc-shaped groove toward the connecting portion, the second arc-shaped groove and the first arc-shaped groove being provided at intervals of 90 degrees in the circumferential direction of the main body, the major diameter direction of the second arc-shaped groove being in the same direction as the axial direction of the main body, and the minor diameter direction being toward the center of the main body; an expansion truncated platform being provided at the front end of the main body, the cone tip direction of the expansion truncated platform being away from the connecting portion.

[0005] In the above structure, the expansion vertebral platform is used for guiding when the main body advances, and at the same time, the tube wall with larger deformation can be expanded and reset for the first time. Then, the setting of the first arc-shaped groove reduces the contact area of ​​the main body during the expansion process. After the first arc-shaped groove repairs part of the inner wall of the sleeve, as the main body moves forward further, the repaired inner wall of the sleeve will reach the position of the second-shaped groove to reduce friction. At the same time, the main body between the adjacent second-shaped grooves repairs the inner wall of the sleeve through which the first arc-shaped groove passes. Therefore, the axial force can be effectively reduced during the repair, and the repeated deformation of the sleeve can be effectively reduced. The axial advancement can be performed by static pressure or axial impact. If a sleeve with larger deformation and longer deformation length is encountered, the axial advancement can be performed by circumferential rotation at the same time, and the sleeve is divided into multiple sectors in the circumferential direction for repair, and axial feeding is continuously performed. Since the entire main body presents a smaller surface contact when in contact with the sleeve, the repair effect can be effectively guaranteed, and the number of repeated extrusions can be reduced and the cold work hardening phenomenon can be reduced.

[0006] The utility model is further configured such that the short diameter node of the first arc-shaped groove is flush with the small diameter end of the expanded truncated platform.

[0007] In the above structure, after the first expansion and reduction of the vertebral platform, the outer wall of the main body between the two first arcuate grooves can be directly involved in the expansion operation, and the two first arcuate grooves can effectively reduce the extrusion contact between the main body and the inner wall of the sleeve, making the expansion force stronger.

[0008] The utility model is further configured such that the short diameter node of the second arc-shaped groove coincides with the long diameter node of the first arc-shaped groove on the side facing the connecting portion in the circumferential direction of the main body.

[0009] In the above structure, after the outer wall of the main body between the two first arc-shaped grooves is expanded, the outer wall of the main body between the two second arc-shaped grooves intervenes and expands the inner wall of the casing at the position where the two first arc-shaped grooves pass. The inner wall of the casing after the main body between the two first arc-shaped grooves is expanded reaches the position of the two second arc-shaped grooves to reduce the expansion resistance.

[0010] The utility model is further configured such that the outer diameter of the main body at the long diameter node position on the side of the second arc-shaped groove facing the connecting portion is larger than the outer diameter of the tail end of the main body.

[0011] In the above structure, the rear end of the main body can reduce the contact with the inner wall of the sleeve, which is beneficial to the advancement of the main body and avoids the situation where the elastic restoring force of the steel itself after the sleeve is squeezed and expanded will cause the main body to be stuck.

[0012] The utility model is further configured such that the first arcuate groove and the outer wall of the main body are transitioned through a first arc at their junction, and the first arcuate groove and the expanded vertebral abutment are transitioned through a second arc at their junction; the second arcuate groove and the outer wall of the main body are transitioned through a third arc at their junction, and the second arcuate groove and the expanded vertebral abutment are transitioned through a fourth arc.

[0013] The utility model is further configured such that a fifth arc transition is formed between the outer wall of the expanded truncated platform and the end surface of the small diameter end of the expanded truncated platform.

[0014] The utility model is further configured such that the outer wall of the expanded vertebral platform and the outer wall of the main body are transitioned through a sixth arc.

[0015] In the above structure, the first arc transition, the second arc transition, the third arc transition, the fourth arc transition, the fifth arc transition and the sixth arc transition can smoothly expand the casing during the tube expansion process.

[0016] The utility model is further configured such that the main body, the connecting portion and the expanded truncated platform are integrally configured; the length from the long diameter node position of the second arc-shaped groove toward the connecting portion to the tail end of the main body is greater than the length from the node position to the front end of the expanded truncated platform.

[0017] In the above structure, the outer walls of the main body and the expanded vertebral platform are provided with a hardened layer, and the hardened layer can be formed by quenching, carburizing, nitriding or carbonitriding; the length of the second arc-shaped groove from the long-diameter node position on the side of the connecting part to the tail end of the main body and the length from the node position to the front end of the expanded vertebral platform are 3:1, which can provide good support and guiding effects for the first arc-shaped groove position and the second arc-shaped groove position of the expanded vertebral platform and the main body.

[0018] The utility model is further configured that the end surface of the connection portion is provided with a grasping channel opened in a direction toward the front end of the main body, and the inner wall of the grasping channel facing the front end of the main body is provided with a closing opening.

[0019] In the above structure, the grabbing channel is used to take out the main body when it is broken by using the male cone; the grabbing channel can also be used for flushing, and the closing can increase the impact force during flushing.

[0020] The utility model is further configured that the inner wall of the grabbing channel is provided with a grabbing bushing which is brazed to the inner wall of the grabbing channel, and the hardness of the grabbing bushing is lower than the hardness of the main body.

[0021] In the above structure, it is convenient to screw in and grab the male vertebra.

[0022] The utility model is further configured such that the end surface of the grabbing bushing is flush with the end surface of the connecting portion and is provided with an inner chamfer.

[0023] The utility model has the following beneficial effects: the expansion vertebral table is used for guiding when the main body advances, and at the same time, the pipe wall with larger deformation can be expanded and reset for the first time, and then the first arc-shaped groove is set to reduce the contact area of ​​the main body during the expansion process. After the first arc-shaped groove repairs part of the inner wall of the sleeve, as the main body further advances, the repaired inner wall of the sleeve will reach the position of the second-shaped groove to reduce friction. At the same time, the main body between the adjacent second-shaped grooves repairs the inner wall of the sleeve through which the first arc-shaped groove passes. Therefore, the axial force can be effectively reduced during the repair, and the repeated deformation of the sleeve can be effectively reduced. The axial advancement can be performed by static pressure or axial impact. If a sleeve with larger deformation and longer deformation length is encountered, it can be advanced by circumferential rotation while advancing axially, and the sleeve is divided into multiple sectors in the circumferential direction for repair, and axial feeding is continuously performed. Since the entire main body presents a smaller surface contact when in contact with the sleeve, the repair effect can be effectively guaranteed, and the number of repeated extrusions can be reduced and the cold work hardening phenomenon can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0025] Figure 2 It is a schematic diagram of the front end orthographic projection structure of the utility model.

[0026] Figure 3 For this utility model Figure 2 Schematic diagram of the structure in the AA section direction.

[0027] Figure 4 For this utility model Figure 2 Schematic diagram of the BB cutting direction structure.

[0028] Figure 5 For this utility model Figure 2 Schematic diagram of the CC cutting direction structure.

[0029] Figure 6 For this utility model Figure 3 Schematic diagram of the three-dimensional structure.

[0030] Figure 7 For this utility model Figure 4 Schematic diagram of the three-dimensional structure.

[0031] Figure 8 For this utility model Figure 5 Schematic diagram of the three-dimensional structure.

[0032] Fig. 9 For this utility model Figure 6 Schematic diagram of the orthographic projection structure.

[0033] Fig.10 For this utility model Figure 7 Schematic diagram of the orthographic projection structure.

[0034] The meanings of the numbers in the figure are as follows: 10 - main body; 11 - connecting part; 12 - first arc groove; 121 - first arc transition; 13 - second arc groove; 131 - third arc transition; 132 - fourth arc transition; 14 - expansion truncated platform; 141 - second arc transition; 142 - fifth arc transition; 143 - sixth arc transition; 15 - grabbing channel; 151 - closing; 16 - grabbing bushing; 161 - inner chamfer. DETAILED DESCRIPTION

[0035] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] refer to Figures 1 to 10 ,like Figures 1 to 10 A special-shaped tube expander shown in the figure includes a main body 10, a connecting portion 11 is provided at the rear end of the main body 10, and two first arc-shaped grooves 12 are arranged at intervals of 180 degrees along the circumferential direction thereof on the outer cylindrical wall at the front end of the main body 10, the major diameter direction φ1 of the first arc-shaped groove 12 is in the same direction as the axial direction of the main body 10, and its minor diameter direction φ2 is toward the center of the main body 10; it also includes second arc-shaped grooves 13 arranged at intervals of 180 degrees along the circumferential direction of the outer wall of the main body 10, the second arc-shaped groove 13 is located on the outer wall of the main body 10 in the direction of the first arc-shaped groove 12 toward the connecting portion 11, the second arc-shaped groove 13 and the first arc-shaped groove 12 are arranged at intervals of 90 degrees in the circumferential direction of the main body 10, the major diameter direction φ3 of the second arc-shaped groove 13 is in the same direction as the axial direction of the main body 10, and its minor diameter direction φ4 is toward the center of the main body 10; the front end of the main body 10 is provided with an expansion truncated platform 14, and the cone tip direction of the expansion truncated platform 14 is facing away from the connecting portion 11.

[0037] In the above structure, the expansion vertebra 14 is used to guide the main body 10 when it advances, and at the same time, the first expansion and reduction of the tube wall with large deformation can be performed. Then, the setting of the first arc-shaped groove 12 reduces the contact area of ​​the main body 10 during the expansion process. After the first arc-shaped groove 12 repairs part of the inner wall of the sleeve, as the main body 10 further advances, the repaired inner wall of the sleeve will reach the position of the second-shaped groove to reduce friction. At the same time, the main body 10 between adjacent second-shaped grooves repairs the inner wall of the sleeve through which the first arc-shaped groove 12 passes. Therefore, the axial force can be effectively reduced during the repair, and the repeated deformation of the sleeve can be effectively reduced. The axial advancement can be performed by static pressure or axial impact. If a sleeve with large deformation and a long deformation length is encountered, it can be advanced by circumferential rotation while advancing axially, and the sleeve is divided into multiple sectors in the circumferential direction for repair, and axial feeding is continuously performed. Since the entire main body 10 presents a small surface contact when in contact with the sleeve, the repair effect can be effectively guaranteed, and the number of repeated extrusions can be reduced and the cold work hardening phenomenon can be reduced.

[0038] In this embodiment, the short-diameter node a1 of the first arc-shaped groove 12 is flush with the small-diameter end of the expanded truncated platform 14 .

[0039] In the above structure, after the first expansion and reduction by inflating the vertebral platform 14, the outer wall of the main body 10 between the two first arcuate grooves 12 can be directly involved in the tube expansion operation, and the two first arcuate grooves 12 can effectively reduce the extrusion contact between the main body 10 and the inner wall of the sleeve, making the tube expansion force stronger.

[0040] In this embodiment, the short-diameter node a2 of the second arc-shaped groove 13 coincides with the long-diameter node a3 of the first arc-shaped groove 12 on the side facing the connecting portion 11 in the circumferential direction of the main body 10 .

[0041] In the above structure, after the outer wall of the main body 10 between the two first arc-shaped grooves 12 is expanded, the outer wall of the main body 10 located between the two second arc-shaped grooves 13 intervenes and expands the inner wall of the sleeve at the position where the two first arc-shaped grooves 12 pass. The inner wall of the sleeve after the expansion of the main body 10 between the two first arc-shaped grooves 12 reaches the position of the two second arc-shaped grooves 13 to reduce the expansion resistance.

[0042] In this embodiment, the outer diameter of the main body 10 at the position of the long diameter node a4 on the side of the second arc-shaped groove 13 facing the connecting portion 11 is larger than the outer diameter of the rear end of the main body 10 .

[0043] In the above structure, the rear end of the main body 10 can reduce the contact with the inner wall of the sleeve, which is conducive to the advancement of the main body 10 and avoids the elastic restoring force of the steel itself after the sleeve is squeezed and expanded, which will cause the main body 10 to be stuck.

[0044] In this embodiment, the first arcuate groove 12 and the outer wall of the main body 10 are connected through a first arc transition 121, and the first arcuate groove 12 and the expanded truncated platform 14 are connected through a second arc transition 141; the second arcuate groove 13 and the outer wall of the main body 10 are connected through a third arc transition 131, and the second arcuate groove 13 and the expanded truncated platform 14 are connected through a fourth arc transition 132.

[0045] In this embodiment, a fifth arc transition 142 is formed between the outer wall of the expanded truncated platform 14 and the end surface of the small diameter end of the expanded truncated platform 14 .

[0046] In this embodiment, a sixth arc transition 143 is formed between the outer wall of the expanded truncated platform 14 and the outer wall of the main body 10 .

[0047] In the above structure, the first arc transition 121, the second arc transition 141, the third arc transition 131, the fourth arc transition 132, the fifth arc transition 142 and the sixth arc transition 143 can smoothly expand the casing during the tube expansion process.

[0048] In this embodiment, the main body 10, the connecting portion 11 and the expanded truncated platform 14 are integrally arranged; the length L1 from the long diameter node a4 position of the second arc-shaped groove 13 toward the connecting portion 11 to the rear end of the main body 10 is greater than the length L2 from the node position to the front end of the expanded truncated platform 14.

[0049] In the above structure, the outer walls of the main body 10 and the expanded truncated platform 14 are provided with a hardened layer, and the hardened layer can be formed by quenching or carburizing or nitriding or carbonitriding; the length L1 from the position of the long diameter node a4 on the side of the second arc-shaped groove 13 facing the connecting portion 11 to the tail end of the main body 10 and the length L2 from the node position to the front end of the expanded truncated platform 14 are in a ratio of 3:1, which can provide good support and guiding effects for the first arc-shaped groove 12 position and the second arc-shaped groove 13 position of the expanded truncated platform 14 and the main body 10.

[0050] In this embodiment, a gripping channel 15 is provided on the end surface of the connecting portion 11 toward the front end of the main body 10 , and a closing opening 151 is provided on the inner wall of the gripping channel 15 toward the front end of the main body 10 .

[0051] In the above structure, the grabbing channel 15 is used to remove the main body 10 by using a male cone (oil pipe extraction tool, not shown in the figure) when the main body 10 is broken; the grabbing channel 15 can also be used for flushing, and the closing end 151 can increase the impact force during flushing.

[0052] In this embodiment, the inner wall of the grabbing channel 15 is provided with a grabbing bushing 16 which is brazed to the inner wall of the grabbing channel 15 , and the hardness of the grabbing bushing 16 is lower than the hardness of the main body 10 .

[0053] In the above structure, it is convenient to screw in and grab the male vertebra.

[0054] In this embodiment, the end surface of the grab bushing 16 is flush with the end surface of the connecting portion 11 and is provided with an inner chamfer 161 .

[0055] The utility model has the beneficial effects that the expansion vertebral table 14 is used for guiding when the main body 10 advances, and at the same time, the pipe wall with larger deformation can be expanded and reset for the first time, and then the first arc groove 12 is set to reduce the contact area of ​​the main body 10 during the expansion process. After the first arc groove 12 repairs part of the inner wall of the sleeve, as the main body 10 further advances, the repaired inner wall of the sleeve will reach the position of the second shape groove to reduce friction. At the same time, the main body 10 between the adjacent second shape grooves repairs the inner wall of the sleeve through which the first arc groove 12 passes. Therefore, the axial force can be effectively reduced during the repair, and the repeated deformation of the sleeve can be effectively reduced. The axial advancement can be performed by static pressure or axial impact. If a sleeve with larger deformation and longer deformation length is encountered, it can be advanced by circumferential rotation while advancing axially, and the sleeve is divided into multiple sectors in the circumferential direction for repair, and axial feeding is continuously performed. Since the entire main body 10 presents a smaller surface contact when in contact with the sleeve, the repair effect can be effectively guaranteed, and the number of repeated extrusions can be reduced and the cold work hardening phenomenon can be reduced.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. A special-shaped tube expander, comprising a main body, wherein a connecting portion is provided at the rear end of the main body, characterized in that: The outer cylindrical wall at the front end of the main body is provided with two first arcuate grooves arranged at intervals of 180 degrees along its circumferential direction, the long diameter direction of the first arcuate groove is in the same direction as the axial direction of the main body, and the short diameter direction is toward the center of the main body; it also includes second arcuate grooves arranged at intervals of 180 degrees along the circumferential direction of the outer wall of the main body, the second arcuate groove is located on the outer wall of the main body in the direction of the first arcuate groove toward the connecting part, the second arcuate groove and the first arcuate groove are arranged at intervals of 90 degrees in the circumferential direction of the main body, the long diameter direction of the second arcuate groove is in the same direction as the axial direction of the main body, and the short diameter direction is toward the center of the main body; the front end of the main body is provided with an expansion vertebral platform, and the cone tip direction of the expansion vertebral platform is away from the connecting part.

2. A special-shaped tube expander according to claim 1, characterized in that: The short diameter node of the first arc-shaped groove is flush with the small diameter end of the expanded truncated platform.

3. A special-shaped tube expander according to claim 2, characterized in that: The short-diameter node of the second arc-shaped groove coincides with the long-diameter node of the first arc-shaped groove on the side facing the connecting portion in the circumferential direction of the main body.

4. The special-shaped tube expander according to claim 1, characterized in that: The outer diameter of the main body at the long diameter node position on the side of the second arc-shaped groove facing the connecting portion is larger than the outer diameter of the tail end of the main body.

5. The special-shaped tube expander according to claim 1, characterized in that: The first arcuate groove and the outer wall of the main body are transitioned through a first arc, and the first arcuate groove and the expanded vertebral abutment are transitioned through a second arc; the second arcuate groove and the outer wall of the main body are transitioned through a third arc, and the second arcuate groove and the expanded vertebral abutment are transitioned through a fourth arc.

6. A special-shaped tube expander according to claim 5, characterized in that: The outer wall of the expanded truncated platform and the end surface of the expanded truncated platform with a small diameter are transitioned through a fifth arc.

7. The special-shaped tube expander according to claim 5, characterized in that: The outer wall of the expanded vertebral platform and the outer wall of the main body are transitioned through a sixth arc.

8. A special-shaped tube expander according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that: The main body, the connecting part and the expanded vertebral platform are integrally arranged; the length from the long diameter node position of the second arc-shaped groove toward the connecting part to the tail end of the main body is greater than the length from the node position to the front end of the expanded vertebral platform.

9. The special-shaped tube expander according to claim 8, characterized in that: The end surface of the connection portion is provided with a grasping channel which is opened in a direction opposite to the front end of the main body, and the inner wall of the grasping channel which is facing the front end of the main body is provided with a closing opening.

10. The special-shaped tube expander according to claim 9, characterized in that: The inner wall of the grabbing channel is provided with a grabbing bushing which is brazed to the inner wall of the grabbing channel, and the hardness of the grabbing bushing is lower than the hardness of the main body.

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