Socket welding square elbow convenient for butt joint
By employing a graded socket structure, an adaptive cleaning brush, and a double-seal design, the problem of insufficient connection accuracy and sealing in socket-welded right-angle elbows during installation is solved, achieving efficient and reliable pipe connections.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-29
- Publication Date
- 2026-04-14
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing socket welded right-angle elbows require stringent precision during installation, are cumbersome to clean, rely on experience for accurate positioning, have insufficient sealing performance, are difficult to adapt to high-pressure conditions, and pose risks of weld stress concentration and leakage.
Employing a graded socket structure, adaptive cleaning brush, double sealing design, and observation window marking lines, it achieves precise pipe connection, automatic cleaning, and double sealing, ensuring welding quality and sealing performance.
It improves installation efficiency, reduces operation difficulty, enhances sealing reliability, adapts to various working conditions, and extends pipeline service life.
Smart Images
Figure CN121854681A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of pipeline connectors, specifically a socket weld right-angle elbow that is easy to connect. Background Technology
[0002] In industrial piping systems, socket-welded right-angle elbows are the core components for achieving 90° pipe turns. They achieve a stable connection between the pipe and the elbow through a socket fit and welding, featuring high connection strength and good pressure resistance. Existing socket-welded right-angle elbows mostly have a single socket design, meaning they only have one cavity for inserting the pipe. During installation, the pipe end must be precisely aligned with the socket, adjusted, and then welding can be performed.
[0003] However, existing technologies have the following key drawbacks: First, the precision requirements for pipe insertion are stringent. Deviations in pipe cutting length, insufficient flatness of the ends, or errors in socket dimensions can all lead to pipes failing to be inserted smoothly or being mispositioned after insertion, requiring repeated adjustments and severely impacting installation efficiency. Second, rust, dust, and other impurities on the pipe surface must be cleaned manually beforehand. This cumbersome process, coupled with incomplete cleaning, can easily result in weak weld joints and reduced sealing performance. Third, the pipe insertion depth relies on the operator's experience and judgment, lacking intuitive observation and positioning mechanisms. This can easily lead to insertion that is too deep or too shallow, causing stress concentration in the weld and posing a risk of cracking and leakage under high temperature and high pressure conditions. Fourth, the sealing structure is simplistic, often relying solely on welded seals or single-ring seals, making it difficult to adapt to harsh conditions such as high pressure and vibration, resulting in insufficient sealing reliability.
[0004] Therefore, the present invention provides a socket weld right-angle elbow that is easy to connect. Summary of the Invention
[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.
[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: A socket-welded right-angle elbow that facilitates connection, comprising an elbow body, wherein the elbow body has a first connection end and a second connection end that are perpendicularly connected to each other, and a pipe to be connected is provided on one side of the first connection end and the second connection end; characterized in that: both the first connection end and the second connection end are provided with a graded socket structure, wherein the graded socket structure includes a guide section, a positioning section and a welding section arranged coaxially, the guide section is located on the outer side of the socket direction, the welding section is located on the inner side of the socket direction, and the positioning section is located between the guide section and the welding section;
[0007] The elbow body has multiple sets of elastic frames symmetrically arranged on its side wall, and an adaptive cleaning brush is fixedly connected to the side wall of the elastic frame.
[0008] The positioning section has an annular expansion sealing groove on the side near the welding section, and a rubber ring that expands when heated is built into the annular expansion sealing groove.
[0009] The inner diameter of the guide section gradually decreases along the insertion direction, forming a trumpet-shaped structure. Its maximum inner diameter is greater than the outer diameter of the pipe to be connected, and its minimum inner diameter is equal to the inner diameter of the positioning section.
[0010] The inner diameter of the positioning section is adapted to the outer diameter of the pipe to be connected, so as to achieve precise positioning of the pipe; the inner wall of the positioning section is also provided with an elastic sealing ring, the inner diameter of which is slightly smaller than the outer diameter of the pipe to be connected.
[0011] The inner diameter of the welding section is larger than the inner diameter of the positioning section, forming an annular welding groove;
[0012] An observation window is provided on the outer wall of the elbow body, and multiple sets of positioning mark lines are fixed to the side wall of the observation window.
[0013] Preferably, the taper of the guide section is 5°-15°.
[0014] Preferably, the elastic frame consists of 2-4 symmetrically arranged groups, made of elastic stainless steel; the adaptive cleaning brush is made of a composite material of elastic metal wire and wear-resistant sponge, and the tilt angle of the brush head is adapted to the taper of the guide section.
[0015] Preferably, the elastic sealing ring is made of high-temperature resistant and corrosion-resistant fluororubber or polytetrafluoroethylene.
[0016] Preferably, the temperature-expanding rubber ring is made of silicone rubber expansion material, and its expansion rate is 30%-50% in an environment of 80-120℃.
[0017] Preferably, the inner wall of the annular welding groove is provided with anti-slip texture.
[0018] Preferably, the elbow body is made of stainless steel, carbon steel or alloy steel, which is compatible with the material of the pipe to be connected.
[0019] Preferably, the positioning mark line is a colored coating.
[0020] The beneficial effects of this invention are as follows:
[0021] 1. The socket weld right-angle elbow of the present invention facilitates connection. The flared guide section guides the pipe to be inserted smoothly, compensating for unevenness and dimensional deviation of the pipe end. With the help of the self-adaptive cleaning brush driven by the elastic frame, the insertion-cleaning operation is realized in one step, eliminating the need for additional cleaning procedures and greatly improving installation efficiency.
[0022] 2. The socket weld right-angle elbow of the present invention, which is easy to connect, allows the operator to observe the pipe insertion position in real time and accurately judge the optimal insertion depth through the combination design of the observation window and positioning mark line, avoiding positioning deviation caused by relying on experience and reducing the skill level requirements of the operator.
[0023] 3. The socket weld right-angle elbow of the present invention, which is easy to connect, has a double sealing structure with a pre-sealing elastic sealing ring and a high-temperature expansion sealing rubber ring. It is suitable for various working conditions from room temperature to high temperature and from low pressure to high pressure, effectively preventing media leakage and improving pipeline operation safety.
[0024] 4. The socket weld right-angle elbow of the present invention, which is easy to connect, ensures uniform filling of the weld and tight bonding through the regular structure of the set annular welding groove and the anti-slip texture design, reducing weld defects. Combined with the positioning function of the graded socket structure, it avoids stress concentration in the weld and extends the service life of the pipeline. Attached Figure Description
[0025] The invention will now be further described with reference to the accompanying drawings.
[0026] Figure 1 This is a perspective view of the present invention;
[0027] Figure 2 This is a cross-sectional structural schematic diagram of the elbow body in this invention;
[0028] Figure 3 yes Figure 2 Enlarged structural diagram at point A in the middle;
[0029] Figure 4 This is a schematic diagram of the elastic sealing ring in this invention;
[0030] Figure 5 This is a schematic diagram of the adaptive cleaning brush in this invention.
[0031] In the diagram: 1. Elbow body; 2. First mating end; 3. Second mating end; 4. Guide section; 5. Positioning section; 6. Welding section; 7. Annular welding groove; 8. Elastic sealing ring; 9. Observation window; 91. Positioning mark line; 10. Pipe to be mated; 11. Adaptive cleaning brush; 12. Elastic frame; 13. Annular expansion sealing groove; 14. Temperature-expanding rubber ring. Detailed Implementation
[0032] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.
[0033] like Figures 1-5As shown in the embodiment of the present invention, a socket weld right-angle elbow that is easy to connect includes an elbow body 1. The elbow body 1 is integrally forged from Q235B carbon steel, and its external dimensions are: total length 200mm, length of each of the two connecting ends 80mm, and elbow corner radius 75mm. The elbow body 1 has a first connecting end 2 and a second connecting end 3 that are perpendicular to each other and internally connected. The two have the same structure and are used to achieve socket welding with a φ50mm pipe 10 (material Q235B) to be connected.
[0034] Both the first mating end 2 and the second mating end 3 are provided with a coaxially arranged hierarchical socket structure, consisting of a guide section 4, a positioning section 5, and a welding section 6 from the outside to the inside. The three sections are integrally formed inside the mating end, and the specific dimensional parameters are as follows:
[0035] Guide section 4: The length along the socket direction is 30mm, the taper is set to 10°, the maximum inner diameter (outer port) is 55mm (5mm larger than the outer diameter of the pipe to be connected), and the minimum inner diameter (connection with the positioning section) is 50.2mm, to ensure that the pipe to be connected 10 can still be inserted smoothly even if there is slight unevenness at the port;
[0036] Positioning section 5: 30mm in length, 50.2mm in inner diameter, with a 0.2mm clearance to the outer diameter (50mm) of the pipe to be connected (positioning section 10), achieving precise positioning; an annular sealing groove (2mm deep, 3mm wide) is provided on the inner wall of positioning section 5 10mm from the connection of guide section 4, with a fluororubber elastic sealing ring 8 embedded in the groove, the inner diameter of which is 49.6mm (0.4mm smaller than the outer diameter of the pipe to be connected); an annular expansion sealing groove 13 (3mm deep, 4mm wide) is provided on the side of positioning section 5 near welding section 6, with a silicone rubber ring 14 that expands upon heating, the initial outer diameter of which is 50.2mm, the inner diameter of which is 49.8mm, and the expansion rate at 100℃ is 40%;
[0037] Welding section 6: 20mm in length and 53.2mm in inner diameter, with a 3mm difference in inner diameter from positioning section 5, forming an annular welding groove 7 (3mm in depth and 3mm in width); the inner wall of the annular welding groove 7 is processed with fine anti-slip textures (0.15mm in depth and 0.8mm in spacing), which are formed by laser engraving process to ensure that the anti-slip textures are firmly bonded to the groove wall.
[0038] Four sets of elastic frames 12 are symmetrically arranged on the side wall of the elbow body 1 corresponding to the guide section 4. The elastic frames 12 are made of 301 stainless steel and have an arc-shaped structure (the arc is consistent with the arc of the inner wall of the guide section). They are detachably connected to the inner side wall of the elbow body 1 by M3 hexagonal bolts. An adaptive cleaning brush 11 is fixed to the inner side wall of the elastic frame 12 with high-strength adhesive. The cleaning brush is made of stainless steel elastic wire with a diameter of 0.15mm and wear-resistant sponge with a density of 35kg / m³. The brush head tilt angle is 10° (consistent with the taper of the guide section). The height of the brush head protruding from the inner wall of the guide section 4 is 0.8mm. The maximum elastic deformation of the elastic frame 12 is 1mm, which can be adapted to the φ49.5-50.5mm pipe 10 to be connected.
[0039] A circular observation window mounting hole (20mm in diameter) is provided on the outer wall of the elbow body 1 at the position corresponding to the positioning section 5. An observation window 9 made of quartz glass is installed in the hole. The thickness of the observation window 9 is 5mm. It is sealed to the mounting hole by a fluororubber sealing ring. The compression of the sealing ring is controlled at 0.5mm to ensure pressure resistance and sealing. Three sets of positioning mark lines 91 (red coating, 0.08mm thick) are printed on the inner wall of the observation window with high temperature coating. They are evenly distributed along the circumference of the observation window. The spacing between adjacent mark lines is 8mm. The middle set of mark lines is aligned with the optimal insertion depth position of the positioning section 5 (that is, when the pipe port to be connected reaches this mark line, the insertion depth is 30mm).
[0040] Working principle: First, check whether the connection between the 4 sets of elastic frames 12 and the adaptive cleaning brush 11 is firm, whether the elastic sealing ring 8 is intact and undamaged, whether the temperature-expanding rubber ring 14 is correctly embedded in the annular expansion sealing groove 13, whether the observation window 9 has no cracks, and whether the positioning mark line 91 is clear.
[0041] Then, align the port of the φ50mm Q235B pipe 10 to be connected with the port of the guide section 4 of the first connection end 2, and adjust the pipe axis to coincide with the axis of the elbow connection end;
[0042] Secondly, the pipe to be connected 10 is slowly pushed in. During the insertion process, the adaptive cleaning brush 11 fits tightly against the outer wall of the pipe to clean the rust and dust on the surface of the pipe. The elastic frame 12 deforms slightly according to the actual outer diameter of the pipe to ensure the cleaning effect. The pipe gradually enters the positioning section 5 under the guidance of the guide section 4.
[0043] Meanwhile, the operator observes the pipe insertion position through the observation window 9. When the pipe end is aligned with the middle set of red positioning mark lines 91 inside the observation window, the pipe is stopped from being pushed. At this time, the pipe insertion depth is 30mm, and the elastic sealing ring 8 is squeezed by the pipe to produce an elastic deformation of 0.4mm, forming the first pre-seal.
[0044] Then, argon arc welding is used to weld in the annular welding groove 7. The welding current is controlled at 80-100A, the welding voltage is 10-12V, and the welding material is ER50-6 welding wire (diameter 1.2mm). During the welding process, the weld temperature gradually rises to about 100℃. When the temperature is high, the rubber ring 14 begins to expand. After expansion, it completely fills the gap between the annular expansion sealing groove 13 and the pipe, forming a second seal.
[0045] Finally, after welding is completed, wait for the weld to cool to room temperature (about 30 minutes), check the appearance of the weld for defects such as porosity, slag inclusion, and cracks, observe through observation window 9 to see if there is any leakage at the sealing part, and gently shake the pipe by hand to check for any looseness.
[0046] Repeat the above steps to weld another φ50mm pipe to be connected to the second connection end 3, completing the installation of the entire right-angle bend and achieving a 90° turn connection of the pipeline.
[0047] This embodiment, through the above structural design, can achieve rapid and accurate docking of pipelines to be connected, improving installation efficiency by more than 40% compared to existing elbows. The double sealing structure can withstand a pressure of 10MPa, ensuring reliable sealing. It is suitable for crude oil transportation pipelines in the petrochemical industry and has a service life of more than 15 years.
[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A socket weld right-angle elbow for easy connection, comprising an elbow body (1), wherein the elbow body (1) has a first connection end (2) and a second connection end (3) that are perpendicularly connected to each other, and a pipe (10) to be connected is provided on one side of the first connection end (2) and the second connection end (3); characterized in that: The first docking end (2) and the second docking end (3) are both provided with a graded socket structure. The graded socket structure includes a guide section (4), a positioning section (5) and a welding section (6) arranged coaxially. The guide section (4) is located on the outside of the socket direction, the welding section (6) is located on the inside of the socket direction, and the positioning section (5) is located between the guide section (4) and the welding section (6). The elbow body (1) has multiple sets of elastic frames (12) symmetrically arranged on its side wall, and the side wall of the elastic frame (12) is fixed with an adaptive cleaning brush (11). The positioning section (5) is provided with an annular expansion sealing groove (13) on the side near the welding section (6), and a heat-expanding rubber ring (14) is built into the annular expansion sealing groove (13). The inner diameter of the guide section (4) gradually decreases along the insertion direction, forming a trumpet-shaped structure. Its maximum inner diameter is greater than the outer diameter of the pipe to be connected (10), and its minimum inner diameter is equal to the inner diameter of the positioning section (5). The inner diameter of the positioning section (5) is adapted to the outer diameter of the pipe (10) to be connected, so as to achieve precise positioning of the pipe; the inner wall of the positioning section (5) is also provided with an elastic sealing ring (8), the inner diameter of the elastic sealing ring (8) is slightly smaller than the outer diameter of the pipe (10) to be connected. The inner diameter of the welding section (6) is larger than the inner diameter of the positioning section (5), forming an annular welding groove (7). The outer wall of the elbow body (1) is provided with an observation window (9), and the side wall of the observation window (9) is fixed with multiple sets of positioning mark lines (91).
2. The socket weld right-angle elbow according to claim 1, characterized in that: The taper of the guide section (4) is 5°-15°.
3. A socket-welded right-angle elbow as described in claim 1, characterized in that: The elastic frame (12) consists of 2-4 symmetrically arranged groups, made of elastic stainless steel; the adaptive cleaning brush (11) is made of a composite material of elastic metal wire and wear-resistant sponge, and the tilt angle of the brush head is adapted to the taper of the guide section (4).
4. A socket-welded right-angle elbow as described in claim 1, characterized in that: The elastic sealing ring (8) is made of high-temperature resistant and corrosion-resistant fluororubber or polytetrafluoroethylene.
5. A socket-welded right-angle elbow as described in claim 1, characterized in that: The heat-expanding rubber ring (14) is made of silicone rubber expansion material, and its expansion rate is 30%-50% in an environment of 80-120℃.
6. A socket-welded right-angle elbow as described in claim 1, characterized in that: The inner wall of the annular welding groove (7) is provided with anti-slip texture.
7. A socket-welded right-angle elbow as described in claim 1, characterized in that: The elbow body (1) is made of stainless steel, carbon steel or alloy steel, which is compatible with the material of the pipe (10) to be connected.
8. A socket-welded right-angle elbow as described in claim 1, characterized in that: The positioning mark line (9) is a colored coating.