Straight connector structure

Abstract

The utility model provides a straight connector structure, which belongs to the technical field of pipeline connection and comprises a female end connector and a male end connector. The female end connector comprises a female end steel pipe section, a transition section and a female end upsetting section which are sequentially connected, and female end internal threads, a first sealing face and a first shoulder are sequentially arranged on the inner side of the female end upsetting section. The male end connector comprises a male end steel pipe section and a male end necking section which are sequentially connected, and the outer side of the male end necking section is sequentially provided with male end external threads, a second sealing face and a second circular bead. The female end internal thread is in threaded connection with the male end external thread, the first sealing face is in interference fit with the second sealing face, and the first shoulder is in abutting fit with the second shoulder. According to the straight connector structure, only one end is subjected to upsetting, the other end is subjected to necking treatment, the product yield can be greatly improved, upsetting cost and heat treatment pipe end bending risks are reduced by half, meanwhile, male end machining efficiency can be greatly improved, and product production cost can be greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline connection, and more specifically relates to a straight connector structure. Background Art

[0002] At present, the straight-connected oil casing joints on the market only need to be screwed on site, which reduces the risk of joint leakage by half. Compared with products with couplings, the wellbore safety performance is improved by half. Therefore, this type of product is widely used at home and abroad.

[0003] However, since this type of buckle adopts the processing route of internal and external roughing - heat treatment - rough machining - fine machining at both ends, the deformation of the pipe end is large, roughing and heat treatment are extremely difficult and costly. At the same time, because it is a roughened product, thread processing can only meet one or two processing times. If both processing times fail, it needs to be re-roughened and heat treated, or scrapped, so the product yield rate is much lower than that of conventional products. Utility Model Content

[0004] The purpose of the utility model is to provide a straight connector structure, which only has one end roughened and the other end is necked, which can not only greatly improve the product yield rate, reduce the roughing cost and the risk of bending of the heat-treated pipe end by half, but also greatly improve the male end processing efficiency and reduce the product production cost.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a straight connector structure, comprising:

[0006] A female end joint, the female end joint comprising a female end steel pipe section, a transition section, and a female end butt section connected in sequence, wherein the inner side of the female end butt section is provided with a female end internal thread, a first sealing surface, and a first shoulder in sequence, wherein the first sealing surface is inclined inward from the female end butt section to the transition section, and the first shoulder is inclined inward from the outside to the side away from the female end butt section;

[0007] A male end connector, the male end connector comprising a male end steel pipe section and a male end necked section connected in sequence, the outer side of the male end necked section being provided with a male end external thread, a second sealing surface, and a second shoulder in sequence, the second sealing surface being inclined inward from the male end necked section toward the male end steel pipe section, and the second shoulder being inclined inward from the outside toward the side away from the male end necked section;

[0008] The female end internal thread is threadedly connected to the male end external thread, the first sealing surface is interference fit with the second sealing surface, and the first shoulder is top-fitted with the second shoulder.

[0009] In a possible implementation, both the female end internal thread and the male end external thread have trapezoidal tooth profiles, and the female end internal thread and the male end external thread are interference fit.

[0010] In a possible implementation, the trapezoidal tooth profile of the female end internal thread is inclined from outside to inside toward the transition section, and the trapezoidal tooth profile of the male end external thread is inclined from outside to inside toward the male end steel pipe section.

[0011] In a possible implementation, the inclination angle of the trapezoidal tooth profile is not less than -4°.

[0012] In a possible implementation, the inner diameter of the female end pier section increases from the female end steel pipe section to the female end pier section, and the outer diameter of the male end necked section increases from the male end steel pipe section to the male end necked section.

[0013] In a possible implementation, the inner diameter of the transition section is smaller than the inner diameter of the female end steel pipe section, and the outer wall of the transition section is inclined outward from the female end steel pipe section toward the female end pier section.

[0014] In a possible implementation, the inclination angle of the outer wall of the transition section is not less than 15°.

[0015] In a possible implementation, a first chamfer is provided on the outer side of the end of the female end pier section, and a second chamfer is provided on the inner side of the end of the female end pier section.

[0016] In a possible implementation, the inclination angle of the first chamfer is not less than 30°.

[0017] In a possible implementation, the inner side of the transition section has a first mating surface, the inner side of the end of the male end necked section has a second mating surface, and the first mating surface is flush with the second mating surface.

[0018] The beneficial effect of the straight connector structure provided by the present invention is that: compared with the prior art, the female end pier section of the female end joint and the male end necking section of the male end joint are relatively installed, and the male end necking section is inserted into the inner side of the male end pier section through a threaded connection method of the male end external thread and the female end internal thread, until the second shoulder of the male end necking section abuts against the first shoulder of the female end pier section. At this time, the first sealing surface of the female end pier section and the second sealing surface of the male end necking section have an interference fit. The straight connector structure provided by the present invention has only one end pierced and the other end necked, which can not only greatly improve the product yield rate, reduce the piercing cost and the risk of bending of the heat-treated pipe end by half, but also greatly improve the male end processing efficiency and reduce the product production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of a female connector provided in an embodiment of the present invention;

[0021] Figure 2 A schematic structural diagram of a male end connector provided in an embodiment of the present utility model;

[0022] Figure 3 This is a structural schematic diagram of a straight connector structure provided by an embodiment of the present utility model.

[0023] Description of reference numerals:

[0024] 100, female end connector; 110, female end steel pipe section; 120, transition section; 130, female end pier section; 140, female end internal thread; 150, first sealing surface; 160, first shoulder; 170, first chamfer; 180, second chamfer; 190, first mating surface;

[0025] 200, male end connector; 210, male end steel pipe section; 220, male end necked section; 230, male end external thread; 240, second sealing surface; 250, second shoulder; 260, second mating surface. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] See also Figures 1 to 3 Now, a straight connector structure provided by the present invention is described. The straight connector structure includes a female end connector 100 and a male end connector 200.

[0028] The female connector 100 includes a female steel pipe section 110, a transition section 120, and a female butt section 130, which are connected in sequence. The inner side of the female butt section 130 is provided with a female internal thread 140, a first sealing surface 150, and a first shoulder 160. The first sealing surface 150 is inclined inward from the female butt section 130 to the transition section 120, and the first shoulder 160 is inclined from the outside to the inside toward the side away from the female butt section 130. The male connector 200 includes a male steel pipe section 210 and a male necked section 220, which are connected in sequence. The outer side of the male necked section 220 is provided with a male external thread 230, a second sealing surface 240, and a second shoulder 250. The second sealing surface 240 is inclined inward from the male necked section 220 to the male steel pipe section 210, and the second shoulder 250 is inclined from the outside to the inside toward the side away from the male necked section 220. The female end internal thread 140 is threadedly connected to the male end external thread 230 , the first sealing surface 150 is interference fit with the second sealing surface 240 , and the first shoulder 160 is top-fitted with the second shoulder 250 .

[0029] The present invention provides a straight connector structure. Compared with the prior art, the female end piercing section 130 of the female end connector 100 and the male end tapered section 220 of the male end connector 200 are installed relative to each other. The male end tapered section 220 is inserted into the inner side of the male end piercing section through a threaded connection between the male end external thread 230 and the female end internal thread 140, until the second shoulder 250 of the male end tapered section 220 abuts against the first shoulder 160 of the female end piercing section 130. At this time, the first sealing surface 150 of the female end piercing section 130 and the second sealing surface 240 of the male end tapered section 220 are interference fit. The present invention provides a straight connector structure, in which only one end is pierced and the other end is tapered. This not only significantly improves the product yield rate and reduces the piercing cost and the risk of bending of the heat-treated pipe end by half, but also significantly improves the male end processing efficiency and reduces the product production cost.

[0030] The second shoulder 250 of the male end's tapered section 220 abuts against the first shoulder 160 of the female end's upsetting section 130, ensuring torque stability and improving the joint's resistance to compression and torsion. Due to the tapered male end and the internal and external upsetting of the female end, the thickness of the abutting shoulder increases by at least 0.5mm compared to a non-tapered product. This increases torsion resistance by 20% to 30% compared to a non-tapered product, while its compression resistance reaches 100% of the pipe body.

[0031] Both the female end internal thread 140 and the male end external thread 230 have a trapezoidal tooth profile, and they form an interference fit. The trapezoidal tooth profile of the female end internal thread 140 tilts from the outside inward toward the transition section 120, while the trapezoidal tooth profile of the male end external thread 230 tilts from the outside inward toward the male end steel pipe section 210. The trapezoidal tooth profile has an inclination angle of no less than -4°. The negative angle tooth profile also provides excellent bending and slip resistance, with a bending resistance of 20° / 30m.

[0032] The inner diameter of the female end pier rough section 130 increases gradually from the female end steel pipe section 110 to the female end pier rough section 130, and the outer diameter of the male end tapered section 220 increases gradually from the male end steel pipe section 210 to the male end tapered section 220. The airtight sealing capability is achieved through the interference fit of the threads of the conical surface against the conical surface, and the sealing capability of the joint can reach 100% of the internal pressure resistance performance of the pipe body.

[0033] The inner diameter of the transition section 120 is smaller than the inner diameter of the female end steel pipe section 110. The outer wall of the transition section 120 is inclined outward from the female end steel pipe section 110 toward the female end pier section 130. The inclination angle of the outer wall of the transition section 120 is not less than 15°. The transition section 120 adopts a gentle tapered transition of not less than 15°, which can effectively reduce stress concentration in the transition area and improve the stress corrosion resistance of the joint and the pipe.

[0034] The outer side of the female end pier section 130 is provided with a first chamfer 170, and the inner side of the female end pier section 130 is provided with a second chamfer 180. The inclination angle of the first chamfer 170 is not less than 30 degrees. The large chamfer design of the first chamfer 170 can reduce the risk of scraping the wellbore wall and encountering resistance when the pipe string is lowered into the well. The second chamfer 180 is formed to guide the male end into the female end smoothly.

[0035] The inner side of the transition section 120 has a first mating surface 190, and the inner side of the end of the male end necked section 220 has a second mating surface 260. The first mating surface 190 is flush with the second mating surface 260. When the first mating surface 190 and the second mating surface 260 remain flush, the turbulence problem during the transmission process can be reduced.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A straight connector structure, characterized in that: include: A female end joint (100), the female end joint (100) comprising a female end steel pipe section (110), a transition section (120) and a female end pier section (130) connected in sequence, the inner side of the female end pier section (130) being provided with a female end internal thread (140), a first sealing surface (150) and a first shoulder (160) in sequence, the first sealing surface (150) being inclined inward from the female end pier section (130) toward the transition section (120), and the first shoulder (160) being inclined from the outside to the inside toward a side away from the female end pier section (130); A male end connector (200) comprising a male end steel pipe section (210) and a male end necked section (220) connected in sequence, wherein the outer side of the male end necked section (220) is provided with a male end external thread (230), a second sealing surface (240), and a second shoulder (250) in sequence, wherein the second sealing surface (240) is inclined inwardly from the male end necked section (220) toward the male end steel pipe section (210), and the second shoulder (250) is inclined inwardly from the outer side toward the side away from the male end necked section (220); The female end internal thread (140) is threadedly connected to the male end external thread (230), the first sealing surface (150) and the second sealing surface (240) are interference fit, and the first shoulder (160) and the second shoulder (250) are butt fit.

2. A straight connector structure according to claim 1, characterized in that: The female end internal thread (140) and the male end external thread (230) are both trapezoidal tooth shapes, and the female end internal thread (140) and the male end external thread (230) are interference fit.

3. A straight connector structure according to claim 2, characterized in that: The trapezoidal tooth profile of the female end internal thread (140) is inclined from outside to inside toward the transition section (120), and the trapezoidal tooth profile of the male end external thread (230) is inclined from outside to inside toward the male end steel pipe section (210).

4. A straight connector structure according to claim 3, characterized in that: The inclination angle of the trapezoidal tooth profile is not less than -4°.

5. The straight connector structure according to claim 1, characterized in that: The inner diameter of the female end pier section (130) increases gradually from the female end steel pipe section (110) toward the female end pier section (130), and the outer diameter of the male end necked section (220) increases gradually from the male end steel pipe section (210) toward the male end necked section (220).

6. The straight connector structure according to claim 1, characterized in that: The inner diameter of the transition section (120) is smaller than the inner diameter of the female end steel pipe section (110), and the outer wall of the transition section (120) is inclined outward from the female end steel pipe section (110) toward the female end pier section (130).

7. A straight connector structure according to claim 6, characterized in that: The inclination angle of the outer wall of the transition section (120) is not less than 15°.

8. The straight connector structure according to claim 1, characterized in that: A first chamfer (170) is provided on the outer side of the end of the female end pier section (130), and a second chamfer (180) is provided on the inner side of the end of the female end pier section (130).

9. The straight connector structure according to claim 8, characterized in that: The inclination angle of the first chamfer (170) is not less than 30°.

10. The straight connector structure according to claim 1, characterized in that: The inner side of the transition section (120) is provided with a first mating surface (190), and the inner side of the end of the male end necking section (220) is provided with a second mating surface (260), and the first mating surface (190) is flush with the second mating surface (260).

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