Anti-skid lining anti-corrosion screwed joint
By designing anti-slip and anti-corrosion threaded joints of the lining ring, the matching settings of the left inclined surface and right inclined surface of the lining ring and the annular protrusion with the slot, the problems of leakage of the lining oil pipe joint and the slip of the lining ring are solved, achieving efficient sealing and anti-corrosion effects of the joints.
Patent Information
- Application Number
- CN202421028577.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-05-13
AI Technical Summary
In the field of oil field machinery, there are problems of leakage and slippage of the lining ring between the lining pipes, resulting in frequent corrosion problems.
An anti-slip and anti-corrosion threaded joint is designed, which includes a joint body and a liner ring. The inner liner ring is provided with a left inclined surface and a right inclined surface, and is arranged through the matching arrangement of the annular projection and the annular slot to ensure a firm engagement between the inner liner ring and the joint body.
It effectively prevents leakage between the flange of the lining oil pipe liner and the lining ring, avoids leakage problems caused by the slippage of the lining ring, and ensures the sealing and corrosion resistance of the joints.
Smart Images
Figure CN222669219U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of oil field machinery, in particular to an anti-slip lining anti-corrosion threaded joint. Background Art
[0002] In the later stage of oilfield development, the water content of crude oil is getting higher and higher, and the corrosion problem is becoming more and more serious. Oilfield production practice has proved that the use of lined oil pipes made of wear-resistant polymer materials lined in ordinary pipes is an economical and practical anti-corrosion measure. However, in the use of lined oil pipes, it was found that the joints between lined oil pipes are a technical problem of anti-corrosion. In order to prevent the appearance of exposed metal areas inside the joints, the industry generally adopts the arrangement of lining rings in the middle of the joints, but the effect is not good. Corrosion problems caused by leakage occur from time to time. The main reasons come from two aspects: First, the lining flange of the lining pipe oil is not tightly sealed with the lining ring, and leakage occurs between the lining flange and the lining ring; second, the lining ring is easy to slip off, loses its protective function and leaks. Utility Model Content
[0003] In order to overcome the defects of the prior art, the utility model provides an anti-slip lining anti-corrosion threaded joint, and its technical solution is as follows:
[0004] A non-slip lined anti-corrosion threaded joint, which is used to connect two lined oil pipes, the ends of the lined oil pipes have external threads and are provided with lining flanges; the joint comprises a joint body and a lining ring; both sides of the joint body are provided with internal threads meshing with the external threads of the lined oil pipes, the middle part of the joint body is provided with a circumferential groove, and the middle part of the circumferential groove is provided with an annular protrusion; the lining ring is embedded in the circumferential groove, and the middle part of the outer side of the lining ring is provided with an annular groove matching the annular protrusion, and the middle of the inner side of the lining ring is provided with a circumferential spine line, and from the spine line to both sides, a left inclined surface and a right inclined surface are presented from high to low.
[0005] Furthermore, the number of the matching annular protrusions and annular grooves is one or more.
[0006] Furthermore, the cross-sections of the matching annular protrusion and annular groove are both rectangular.
[0007] Furthermore, the cross-sections of the matching annular protrusion and annular groove are both dovetail-shaped.
[0008] Furthermore, the inclination angles of the left inclined surface and the right inclined surface of the liner ring are equal.
[0009] Furthermore, the inclination angles of the left inclined surface and the right inclined surface of the liner ring are 5 to 30 degrees.
[0010] Compared with the prior art, the utility model mainly has the following beneficial technical effects:
[0011] 1. Since the liner ring is provided with a left inclined surface and a right inclined surface, the inner liner flange of the liner oil pipe and the liner ring are well sealed without gaps, effectively preventing corrosion due to leakage.
[0012] 2. Through the matching setting of the annular protrusion and the annular groove, the liner ring and the joint body are firmly engaged together, effectively preventing leakage caused by the slipping of the liner ring.
[0013] 3. Simple structure, low production cost, easy and quick installation. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the structure of the utility model when there is one annular slot and the cross section is rectangular;
[0015] Figure 2 This is a schematic diagram of the structure of the utility model when there are two annular slots and the cross section is rectangular;
[0016] Figure 3 This is a schematic diagram of the structure of the utility model when there is one annular groove and the cross section is dovetail-shaped;
[0017] In the figure: 1-connector body, 2-annular groove, 3-internal thread, 4-backbone line, 5-left inclined surface, 6-right inclined surface, 7-annular protrusion, 8-inner lining ring, 9-circumferential groove. DETAILED DESCRIPTION
[0018] The utility model is described in detail below in conjunction with the embodiments and drawings. Example 1
[0019] See also Figure 1 , Figure 2 and Figure 3 A slip-proof lining anti-corrosion threaded joint, which is used to connect two lined oil pipes, the ends of the lined oil pipes have external threads and are provided with lining flanges; the joint comprises a joint body 1 and a lining ring 8; both sides of the joint body 1 are provided with internal threads 3 meshing with the external threads of the lined oil pipe, the middle part of the joint body is provided with a circumferential groove 9, and the middle part of the circumferential groove 9 is provided with an annular protrusion 7; the lining ring 8 is embedded in the circumferential groove 9, and the middle part of the outer side of the lining ring 8 is provided with an annular groove 2 matching the annular protrusion 7, and the middle of the inner side of the lining ring 8 is provided with a circumferential spine line 4, and from the spine line 4 to both sides, a left inclined surface 5 and a right inclined surface 6 from high to low are presented. Example 2
[0020] See also Figure 1 , Figure 2 and Figure 3A non-slip lining anti-corrosion threaded joint, based on the technical solution described in Example 1, the matching annular protrusion 7 and annular groove 2 are both one or more; considering the reliability and economy, it is more appropriate to set them as two. Example 3
[0021] See also Figure 1 , Figure 2 and Figure 3 A non-slip lining anti-corrosion threaded joint, based on the technical solution described in Example 1, the matching annular protrusion 7 and annular groove 2 are both rectangular or dovetail shaped in cross section, and the dovetail shape is more secure than the rectangle. Example 4
[0022] See also Figure 1 , Figure 2 and Figure 3 A non-slip lining anti-corrosion threaded joint, based on the technical solution recorded in Example 1, the inclination angles of the left inclined surface and the right inclined surface of the lining ring are equal and are 5 to 30 degrees. Within this angle range, it can ensure that the lining oil pipe is easily pushed into the joint, and the inner lining flange of the lining oil pipe and the lining ring are well sealed without gaps, while not affecting the flow rate of the fluid in the pipe.
[0023] The basic working principle of the utility model is as follows:
[0024] Insert the liner ring 8 into the circumferential groove 9 of the joint body 1, and the annular groove 2 on the liner ring 8 is perfectly engaged with the annular protrusion 7 on the circumferential groove 9. Screw in a lined oil pipe from the left end of the joint body 1, the outer thread of the lined oil pipe is engaged with the inner thread 3 of the joint body 1, and the liner flange of the lined oil pipe climbs along the left inclined surface 5 of the liner ring 8 toward the backbone line 4 until the liner flange and the left inclined surface 5 are stuck and cannot move forward. At this time, the liner flange and the left inclined surface 5 are closely connected, completely eliminating the possibility of leakage between the two. Similarly, screw another lined oil pipe in from the right end of the joint body 1, the outer thread of the lined oil pipe engages with the inner thread 3 of the joint body 1, and the lining flange of the lined oil pipe climbs along the right inclined surface 6 of the lining ring 8 toward the backbone line 4 until the lining flange and the right inclined surface 6 are stuck and cannot move forward. At this time, the lining flange and the right inclined surface 6 are closely connected, completely eliminating the possibility of leakage between the two.
Claims
1. An anti-slip lining anti-corrosion threaded joint, which is used to connect two lined oil pipes, the ends of the lined oil pipes have external threads and are provided with lining flanges; the joint includes a joint body and a lining ring, characterized in that: Internal threads meshing with the external threads of the lining oil pipe are provided on both sides of the joint body, a circumferential groove is provided in the middle of the joint body, and an annular protrusion is provided in the middle of the circumferential groove; the lining ring is embedded in the circumferential groove, an annular groove matching the annular protrusion is provided in the middle of the outer side of the lining ring, a circumferential spine line is provided in the middle of the inner side of the lining ring, and a left inclined surface and a right inclined surface are presented from high to low on both sides from the spine line.
2. The anti-slip lining anti-corrosion threaded joint according to claim 1, characterized in that: The matching annular protrusions and annular grooves are each one or more.
3. The anti-slip lining anti-corrosion threaded joint according to claim 1, characterized in that: The cross sections of the matching annular protrusion and annular groove are both rectangular.
4. The anti-slip lining anti-corrosion threaded joint according to claim 1, characterized in that: The cross sections of the matching annular protrusion and annular groove are both dovetail-shaped.
5. The anti-slip lining anti-corrosion threaded joint according to claim 1, characterized in that: The inclination angles of the left inclined surface and the right inclined surface of the liner ring are equal.
6. The anti-slip lining anti-corrosion threaded joint according to claim 5, characterized in that: The inclination angles of the left inclined surface and the right inclined surface of the liner ring are 5 to 30 degrees.