Stainless steel elbow

Abstract

The utility model discloses a reasonable structure, convenient to install's stainless steel elbow belongs to pipeline connecting piece technical field. The elbow includes elbow main part structure, inner socket type straight round pipe section structure and straight round pipe section structure, and wherein the elbow main part is 90 degree arc round pipe section, and two ends are connected with the straight round pipe section of on -the -spot cuttable through welding or integral forming mode inner socket type straight round pipe section. The straight round pipe section can set up the arc notch design of adaptive welding stand, and the on -the -spot installation flexibility and the degree of fit are enhanced, and the inner socket type straight round pipe section can be equipped with axial notch structure, and the centring and the anti -pullout performance when inserting are improved. The elbow whole adopts stainless steel material to make, and the connecting mode is various, and the manufacturing technology is simplified, and is suitable for standardization batch production. Compared with prior art, the utility model has remarkable advantage in the aspect of improving the reliability of connection, reducing the manufacturing cost, enhancing the construction adaptability and the aesthetic property, and is applicable to building decoration, ventilation and smoke exhaust and a variety of pipeline systems.

Description

Technical Field

[0001] This utility model relates to the technical field of elbow pipe connectors, specifically to a stainless steel elbow. Background Technology

[0002] With the development of the modern building decoration industry, stainless steel elbows are widely used in various pipeline systems such as stair handrails, corridor railings, smoke exhaust ducts, and ventilation systems due to their excellent corrosion resistance, mechanical strength, and decorative properties. For example, the Chinese utility model patent "A Socket-Type Metal Elbow" (patent number: CN202421144447.1) discloses an elbow structure with inner and outer socket-type straight pipe sections, which is manufactured through an integrated molding process and has the advantages of simple structure and convenient installation.

[0003] However, the existing technology (including but not limited to the aforementioned patents) has the following drawbacks:

[0004] Complex manufacturing process: One-piece molded elbows rely on integral casting or stamping, which requires high precision molds, resulting in a complex manufacturing process and high manufacturing costs;

[0005] Poor on-site adaptability: The port connection method is limited and cannot be flexibly adjusted according to on-site needs, increasing the difficulty of construction.

[0006] Insufficient connection adaptability: The existing elbow ends lack welded straight pipe sections with symmetrical arc notches that can be cut, affecting the efficiency and aesthetics of precise welding with the column.

[0007] Therefore, there is an urgent need for a stainless steel elbow with a reasonable structure, convenient installation, flexible angle adjustment, and excellent connection performance to overcome the above-mentioned technical defects and achieve rapid assembly and precise positioning in building decoration systems. Summary of the Invention

[0008] The purpose of this utility model is to provide a stainless steel elbow to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A stainless steel elbow, characterized in that it comprises an elbow main structure, an inner socket-type straight circular pipe section structure, and a straight circular pipe section structure; the elbow main structure is an arc-shaped circular pipe section bent at 90°; the inner socket-type straight circular pipe section structure is fixedly connected to one end of the elbow main structure for forming a socket fit with an external pipe fitting; the straight circular pipe section structure is fixedly connected to the other end of the elbow main structure, its outer diameter is equal to the outer diameter of the elbow main structure at that end, and it is used for welding connection with an external pipe fitting, and is not used as a socket structure; the length of the straight circular pipe section structure is not less than 0.4 times its outer diameter.

[0011] Furthermore, the straight circular pipe section structure can be cut with two symmetrical arc-shaped notches at the end on site according to requirements. The arc of the notch matches the outer circle contour of the column or support structure to be welded and is symmetrical about the central axis of the straight circular pipe section.

[0012] Furthermore, the outer diameter of the inner socket-type straight circular pipe section structure is smaller than the outer diameter of the elbow main structure at the connection end, so as to form a fitting gap between the two for socket connection; the size of the fitting gap is 0.1mm to 1mm.

[0013] Furthermore, the end of the inner socket-type straight circular pipe section structure is provided with at least one longitudinally extending axial slit structure.

[0014] Furthermore, the number of longitudinal cut structures is preferably 2 to 4, and they are evenly distributed along the end circumference of the inner socket-type straight circular pipe section structure; the axial length of each longitudinal cut is preferably 5 mm to 20 mm.

[0015] Furthermore, the fixed connection between the main structure of the elbow, the inner socket-type straight circular pipe section structure, and the straight circular pipe section structure is either welded or integrally formed.

[0016] Furthermore, the stainless steel elbow is made entirely of a single stainless steel material, selected from 304 stainless steel, 316 stainless steel, or 201 stainless steel; the main body structure of the elbow, the inner socket-type straight round pipe section structure, and the straight round pipe section structure are connected to each other through an integral forming process or a welding forming process; when welding forming is used, the welding filler material is consistent with the composition of the stainless steel elbow base material; when integral forming is used, it is formed by integral stamping or casting using a mold.

[0017] Furthermore, the stainless steel elbow can also be a split-welded composite structure; the material of the main structure of the elbow is a stainless steel base material, selected from one of 304 stainless steel, 316 stainless steel or 201 stainless steel; the welding filler material used in the weld area is selected from austenitic stainless steel welding wire, martensitic stainless steel welding wire or nickel-based alloy welding wire, etc.; the welding filler material is metallurgically compatible with the stainless steel base material and can form a strong welded joint.

[0018] Furthermore, the welding forming method is selected from one of argon arc welding, laser welding, high frequency welding, plasma welding, etc., or a combination of two or more of these welding methods.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] Enhanced on-site adaptability: By setting up a straight pipe section structure that can be cut on-site, it breaks through the limitation of traditional elbows that can only be connected by spigot and socket, and realizes flexible adjustment and precise welding. It is especially suitable for welding connections with columns or pipe ends, significantly improving the flexibility and adaptability of on-site construction.

[0021] Manufacturing process optimization: The elbow body and the socket-type straight pipe section can be manufactured using a separate welding structure, which reduces the dependence on molds and equipment for one-piece molding, reduces mold production costs, improves production efficiency, and facilitates mass production.

[0022] Improved connectivity performance:

[0023] Straight pipe sections can be used directly for welding, avoiding secondary welding operations on site;

[0024] The symmetrical arc-shaped notch design improves welding accuracy and structural strength;

[0025] The design of the outer wall diameter difference (1.2mm~10mm) of the socket-type straight pipe section improves the connection sealing performance and pull-out resistance;

[0026] The longitudinal cut structure at the end enhances the centering and self-centering capabilities during insertion through elastic deformation, reducing insertion and extraction resistance and installation errors, and improving installation efficiency and connection quality.

[0027] Good compatibility between materials and functions: Made of highly corrosion-resistant stainless steel (such as 304 / 316 / 201), suitable for exposed building environments; surface treatment processes (such as mirror polishing and brushing) make it both functional and decorative. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are explained and described together with the following description of the present invention, but do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0030] Figure 2 This is a side view of the present invention;

[0031] Figure 3 This is a cross-sectional view of the present invention;

[0032] Explanation of reference numerals in the attached figures:

[0033] 1: Elbow main structure

[0034] 2: Inner socket type straight circular pipe section structure

[0035] 3: Straight circular pipe section structure

[0036] 4: Longitudinal cut structure Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0038] The embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0039] like Figure 1-3 As shown, this embodiment discloses a stainless steel elbow, characterized in that it includes an elbow main structure 1, an inner socket-type straight circular pipe section structure 2, and a straight circular pipe section structure 3; the elbow main structure 1 is an arc-shaped circular pipe section bent at 90°; the inner socket-type straight circular pipe section structure 2 is fixedly connected to one end of the elbow main structure 1 and is used to form a socket fit with an external pipe fitting; the straight circular pipe section structure 3 is fixedly connected to the other end of the elbow main structure 1, and its outer diameter is equal to the outer diameter of the elbow main structure 1 at that end, and is used for welding connection with an external pipe fitting, and is not used as a socket structure; the length of the straight circular pipe section structure 3 is not less than 0.4 times its outer diameter.

[0040] In this embodiment, the connection between the two ends of the elbow body 1 and the inner socket-type straight circular pipe section structure 2 and the straight circular pipe section structure 3 satisfies the standard geometric relationship of a 90° elbow, that is, the axis of the straight pipe section is perpendicular to the plane of the corresponding port.

[0041] In this embodiment, the construction personnel can first insert the inner socket-type straight round pipe section structure 2 into the pipe to be connected, adjust the angle, and then weld the straight round pipe section structure 3 to the wall or the end pipe to achieve rapid installation; there is no need to weld the straight round pipe section structure 3 on site, which simplifies the construction process and improves the installation efficiency.

[0042] In this embodiment, the straight circular pipe segment structure 3 can be cut with two symmetrical arc-shaped notches at its ends on-site as needed. The arc of these notches matches the outer circular contour of the column or support structure to be welded and is symmetrical about the central axis of the straight circular pipe segment, thereby achieving precise fitting and welding, improving connection strength and aesthetics. This symmetrical structural design facilitates uniform thermal stress distribution during welding, stable weld quality, and high structural strength. The arc-shaped notches on the straight circular pipe segment structure 3 can be precisely prefabricated using laser cutting or CNC cutting equipment, or they can be manually cut on-site according to the actual installation angle, adapting to different welding angles and connection structure requirements.

[0043] In this embodiment, the outer diameter of the inner socket-type straight circular pipe section structure 2 is smaller than the outer diameter of the elbow main body structure 1 at the connecting end, so as to form a fitting gap between the two for socket connection; the size of the fitting gap is 0.1mm to 1mm. This range is the optimal implementation method verified by multiple tests, and is closely related to the tightness, sealing and pull-out resistance of the socket connection.

[0044] In this embodiment, the end of the inner socket-type straight circular pipe section structure 2 is provided with at least one longitudinally extending axially extended longitudinal slit structure 4. The longitudinal slit structure 4 enhances the self-adaptive ability of the socket section through axial elastic deformation, reduces the risk of installation misalignment, and improves the construction error tolerance rate.

[0045] In this embodiment, the number of longitudinal cut structures 4 is preferably 2 to 4, and they are evenly distributed along the end circumference of the inner socket-type straight circular pipe section structure 2; the axial length of each longitudinal cut is preferably 5 mm to 20 mm. The design of multiple cuts evenly distributed balances local stress concentration, ensuring neutral stability and uniform contact of the sealing surface during the socketing process.

[0046] In this embodiment, the fixed connection between the elbow main structure 1, the inner socket-type straight circular pipe section structure 2, and the straight circular pipe section structure 3 is either welded or integrally formed. When welded, the welding filler material has the same composition as the base material of the stainless steel elbow; when integrally formed, it is formed by integral stamping or casting using a mold. Surface treatment processes can be selected according to actual needs, such as mirror polishing or wire drawing, to balance functionality and aesthetics.

[0047] In this embodiment, the stainless steel elbow is made entirely of a single stainless steel material, selected from 304, 316, or 201 stainless steel. The elbow main structure 1, the inner socket-type straight circular pipe section structure 2, and the straight circular pipe section structure 3 are interconnected through an integral molding process or a welding process. When welding is used, the welding filler material is consistent with the composition of the stainless steel elbow base material. When integral molding is used, it is formed by integral stamping or casting using a mold. Welding facilitates production and processing, especially suitable for manufacturing elbows with large diameter structures; while integral molding can improve the overall structural strength, reduce welding defects, and is suitable for high-requirement industrial piping systems.

[0048] In this embodiment, the stainless steel elbow can also be a split-welded composite structure; the material of the main body structure 1 of the elbow is a stainless steel base material, selected from 304 stainless steel, 316 stainless steel, or 201 stainless steel; the welding filler material used in the weld area is selected from austenitic stainless steel welding wire, martensitic stainless steel welding wire, or nickel-based alloy welding wire; the welding filler material is metallurgically compatible with the stainless steel base material and can form a strong weld joint. The surface treatment process can be selected according to actual needs, such as mirror polishing or wire drawing, to balance functionality and decoration.

[0049] In this embodiment, the welding method is selected from one of argon arc welding, laser welding, high-frequency welding, plasma welding, etc., or a combination of two or more of these welding methods, which are suitable for different welding positions and process requirements. Different welding methods are suitable for elbow products of different specifications and materials.

[0050] The welding position is preferably at the connection between the main structure 1 of the elbow and the inner socket-type straight circular pipe section structure 2 and the straight circular pipe section structure 3. The welded joint is flat and has high strength, avoiding the stress concentration problem caused by uneven material flow in the one-piece elbow manufacturing process, and improving the overall structural strength.

[0051] In this embodiment, by functionally partitioning the elbow main structure 1, the inner socket-type straight circular pipe section structure 2, and the straight circular pipe section structure 3, a multi-functional connection method and on-site construction flexibility are achieved. The inner socket structure is used for rapid insertion, while the straight circular pipe section is used for precise welding; the two form a complementary connection mechanism, significantly improving installation efficiency and adaptability. The straight circular pipe section has symmetrical arc-shaped notches, which not only improves welding accuracy and structural strength but also allows for angle customization via laser, CNC, or on-site manual cutting to meet diverse connection needs. Simultaneously, the inner socket structure has straight cuts at its ends, enhancing self-centering capability during insertion through elastic deformation, reducing installation errors and construction difficulty. Through reasonable dimensional matching (such as outer diameter difference, cut length and number) and material selection (such as 304 / 316 stainless steel and austenitic welding wire), the above structures synergistically improve connection sealing, pull-out resistance, structural strength, and construction convenience, thereby achieving comprehensive optimization of the elbow's overall performance and making it suitable for various scenarios such as building decoration and industrial pipelines.

[0052] In summary, this utility model provides a stainless steel elbow with a reasonable structure, reliable connection, convenient installation, and wide applicability. Compared with the authorized one-piece molded elbow, it has substantial improvements and significant progress in structural design, manufacturing process, construction adaptability, material utilization rate, and ease of maintenance, and has broad application value.

[0053] The above description is merely an exemplary embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations and substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stainless steel elbow, characterized in that: The structure includes a main elbow structure (1), an inner socket-type straight circular pipe section structure (2), and a straight circular pipe section structure (3). The main elbow structure (1) is an arc-shaped circular pipe section bent at 90°. The inner socket-type straight circular pipe section structure (2) is fixedly connected to one end of the main elbow structure (1) and is used to form a socket fit with external pipe fittings. The straight circular pipe section structure (3) is fixedly connected to the other end of the main elbow structure (1), and its outer diameter is equal to the outer diameter of the main elbow structure (1) at that port. It is used for welding connection with external pipe fittings and is not used as a socket structure. The length of the straight circular pipe section structure (3) is not less than 0.4 times its outer diameter.

2. The stainless steel elbow according to claim 1, characterized in that: The outer diameter of the inner socket type straight circular pipe section structure (2) is smaller than the outer diameter of the elbow main structure (1) at the connection end, so as to form a fitting gap between the two for socket connection; the size of the fitting gap is 0.1mm to 1mm.

3. The stainless steel elbow according to claim 2, characterized in that: The end of the inner socket type straight circular tube segment structure (2) is provided with at least one longitudinal cut structure (4) extending along the axial direction.

4. The stainless steel elbow according to claim 3, characterized in that: The number of the longitudinal cut structures (4) is 2 to 4, and they are evenly distributed along the end circumference of the inner socket type straight circular pipe section structure (2); the axial length of each longitudinal cut is 5 mm to 20 mm.

5. The stainless steel elbow according to claim 1, characterized in that: The fixed connection between the elbow main structure (1), the inner socket type straight circular pipe section structure (2), and the straight circular pipe section structure (3) is either welded or integrally formed.

6. The stainless steel elbow according to claim 5, characterized in that: The stainless steel elbow is made entirely of a single stainless steel material, selected from 304 stainless steel, 316 stainless steel or 201 stainless steel; the main body structure (1), the inner socket type straight round pipe section structure (2) and the straight round pipe section structure (3) of the elbow are connected to each other by an integral forming process or a welding forming process; when welding forming is used, the welding filler material is consistent with the composition of the base material of the stainless steel elbow; when integral forming is used, it is formed by integral stamping or casting process using a mold.

7. The stainless steel elbow according to claim 5, characterized in that: The stainless steel elbow is a split-welded composite structure; the material of the main structure (1) of the elbow is a stainless steel base material, selected from 304 stainless steel, 316 stainless steel or 201 stainless steel; the welding filler material used in the weld area is selected from austenitic stainless steel welding wire, martensitic stainless steel welding wire or nickel-based alloy welding wire; the welding filler material is metallurgically compatible with the stainless steel base material and can form a strong welded joint.

8. The stainless steel elbow according to claim 6 or 7, characterized in that: The welding forming method is selected from one of argon arc welding, laser welding, high frequency welding, and plasma welding, or a combination of two or more of these welding methods.

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