An integrally formed pipe connection structure

Abstract

The utility model discloses a kind of integrally-formed pipeline connecting structures, disclose a kind of integrally-formed pipeline connecting structures, to solve the short straight pipe needed to be installed on site in the existing pipeline connection to adapt flange bolt installation, leading to low efficiency and welding quality hidden trouble problem.The pipeline connecting structure includes integrated tee and integrated elbow;The integrated tee is at least one place of the tee main body and is equipped with integrally-formed extension pipe, and the integrated elbow is at least one place of the elbow main body and is equipped with integrally-formed extension pipe;Extension pipe and corresponding main body are equal diameter, end flange is connected, and extension pipe length is greater than the length of flange connecting bolt.The application is integrally-formed with the extension pipe and main body design, eliminates the step of on-site pipe cutting, polishing, welding short straight pipe, improves installation efficiency, simultaneously avoids welding defect, enhances the sealing property and structural strength of pipeline connection, applicable to water pump inlet and outlet and various flange-connected pipeline systems.

Description

Technical Field

[0001] This utility model relates to an integrally molded pipe connection structure. Background Technology

[0002] During pipeline system installation, flange connections are widely used in scenarios such as pump inlets and outlets, and the connection of elbows and straight pipe sections due to their convenient assembly and disassembly and stable sealing performance. However, the existing flange connection method has a significant drawback: in order to ensure that the bolts can be smoothly inserted during flange installation (avoiding interference between the bolts and the main pipe body), a short straight pipe section needs to be installed on-site at the end of the bend or tee.

[0003] Specifically, the existing connection process involves the following steps: 1. Cutting the short straight pipe to the required length for installation; 2. Grinding the inner and outer walls of the short straight pipe ends to remove burrs and oxide layers; 3. Beveling the ends of the short straight pipe to meet welding requirements; 4. Welding the short straight pipe to the ends of the bend / tee; 5. Finally, welding a flange to the other end of the short straight pipe to complete the connection.

[0004] The above process has many problems: On the one hand, the on-site processing steps are cumbersome (pipe cutting, grinding, beveling, welding), which not only consumes a lot of time and reduces installation efficiency, but also places high demands on the technical level of the operators; on the other hand, on-site welding is prone to defects (such as weld beads, incomplete penetration, porosity, etc.), which leads to the risk of leakage at the pipe connection. At the same time, the welding process will damage the structural integrity of the pipe end and reduce the load-bearing strength of the connection, especially in high-pressure and corrosive media transportation scenarios, where the hidden dangers are more prominent.

[0005] Therefore, there is an urgent need for a pipe connection structure that can eliminate the need for on-site short straight pipe processing and welding while ensuring the convenience of flange installation and the reliability of connection. Utility Model Content

[0006] In view of the problems of existing pipe flange connections, such as the need to install short straight pipes on site, cumbersome processing steps, low efficiency, and potential welding quality risks, the purpose of this utility model is to provide an integrated pipe connection structure. By integrating the extension pipe with the main pipe body, the installation process is simplified and the connection reliability is improved.

[0007] An integrally molded pipe connection structure, wherein the pipe connection structure is an integral tee or an integral bend connected by a flange; The integrated tee includes a tee body, wherein at least one inlet / outlet is provided with an integrally formed extension pipe, the diameter of which is the same as the diameter of the tee body at that location, the extension pipe is integrally formed with the tee body, and the end of the extension pipe is connected to a flange. The integrated bend includes a bend body, and at least one connection port of the bend body is provided with an integrally formed extension pipe. The diameter of the extension pipe is the same as the diameter of the bend body at that location. The extension pipe is integrally formed with the bend body, and a flange is connected to the end of the extension pipe. The extension pipe is longer than the connecting bolts used on the flange. This eliminates the need for on-site pipe cutting; on-site installation only requires aligning the flange with the external pipe flange, inserting the bolts, and tightening the nuts. The installation time for a single connection is reduced to 10-15 minutes, increasing installation efficiency by over 80%.

[0008] Furthermore, the length of the extension pipe of the tee or bend should be 5-30mm longer than the length of the corresponding flange connection bolt.

[0009] Furthermore, the flange is connected to the extension pipe of the tee and the extension pipe of the bend by welding. After factory welding, uniform non-destructive testing and anti-corrosion treatment (such as galvanizing and anti-corrosion paint) can be performed to further improve the corrosion resistance of the joint and make it suitable for harsh environments such as chemical and marine engineering.

[0010] Furthermore, the bending angle of the main body of the bent pipe is 30°-120°. The bending part of the metal bent pipe body adopts an integral molding process without welding joints, which avoids cracking due to stress concentration at the bending part and improves the impact resistance of the bent pipe.

[0011] Furthermore, the main body of the tee is a T-type tee or a Y-type tee.

[0012] Furthermore, the wall thickness of the extension pipe of the tee is the same as that of the tee body, and the wall thickness of the extension pipe of the bend is the same as that of the bend body. The same wall thickness ensures uniform structural strength between the pipe body and the extension pipe, avoiding stress concentration caused by abrupt changes in wall thickness. This equal wall thickness design allows for a smooth transition of the pipe's inner wall, without steps or protrusions, reducing fluid flow resistance and preventing media from stagnating or depositing at points of abrupt wall thickness changes (e.g., reducing scale and dirt buildup when transporting industrial wastewater containing impurities).

[0013] Furthermore, the material of the pipe connection structure is metal, including stainless steel, cast iron, or carbon steel. Beneficial effects

[0014] 1. Simplify the installation process and improve efficiency: Eliminate the steps of on-site pipe cutting, grinding, beveling, and welding short straight pipes. Installation can be completed simply by connecting the flange to the external pipe flange with bolts. Installation time is reduced by more than 60%, and the dependence on the technical level of operators is reduced.

[0015] 2. Eliminate welding defects and improve reliability: The extension tube is integrally formed with the main body, without on-site welding joints, avoiding defects such as weld beads and incomplete penetration, and significantly reducing the risk of leakage; at the same time, the load-bearing strength of the integrally formed structure is 30%-50% higher than that of the welded structure, making it suitable for high-pressure working conditions.

[0016] 3. Optimize fluid flow performance: The extension pipe is designed with the same diameter as the main body, which avoids the possible sudden change in inner diameter when the short straight pipe is welded to the main body, reduces fluid flow resistance, and lowers energy consumption. It is especially suitable for scenarios where fluid resistance is sensitive, such as pump inlet and outlet.

[0017] 4. Reduced maintenance costs: The one-piece molded structure has a longer service life than the welded structure and reduces the number of repairs caused by welding defects, resulting in a long-term maintenance cost reduction of more than 40%. Attached Figure Description

[0018] Figure 1 This is an exploded view of the existing bend connection method; Figure 2 This is a schematic diagram of a one-piece bent pipe structure; Figure 3 This is an exploded view of the existing T-junction connection method; Figure 4 This is a schematic diagram of an integrated tee structure; In the diagram: 1. Bend, 2. Short straight pipe, 3. Flange, 4. Integrated bend, 41. Bend extension pipe, 5. Tee, 6. Integrated tee, 61. Tee extension pipe. Detailed Implementation

[0019] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0020] Example 1: One-piece pipe bend, such as Figure 2 As shown.

[0021] This embodiment is a 90° integrated elbow suitable for water pump outlets, with the following specific parameters: Structural dimensions: The nominal diameter of the bend body is DN250, and the bending angle is 90°; the bend extension pipe is set at both ends of the bend body, with a length of 125mm. The extension pipe is 20mm longer than the bolt, and its diameter and wall thickness are the same as those of the bend body.

[0022] Material and process: Made of cast iron, the bending body and the bending extension tube are integrally formed through precision casting process. After forming, the end of the extension tube is machined to ensure the flatness of the end face (tolerance ≤ 0.1mm).

[0023] Flange connection: Argon arc welding is used to weld a PN1.6MPa plate flat welding flange (GB / T 9119-2010 standard) at the end of the bend extension pipe. After welding, a water pressure test is performed (test pressure 2.4MPa, pressure holding for 30min without leakage).

[0024] Installation process: Align the flanges at both ends of the integrated bend with the pump outlet flange and the downstream straight pipe flange, insert the high-strength bolts, and tighten the nuts to complete the installation. No short straight pipe needs to be processed on site.

[0025] Example 2: Integrated tee, such as Figure 4 As shown.

[0026] This embodiment is a T-type integrated tee suitable for chemical pipelines, with the following specific parameters: Structural dimensions: The main body of the tee is a T-shaped structure with a nominal diameter of DN250 for the main flow channel; an extension pipe is installed at the inlet, with a length of 125mm; the diameter of the extension pipe is the same as the diameter of the corresponding flow channel, and the wall thickness is the same as the main body.

[0027] Material and process: Made of cast iron, integrally molded to ensure uniform metallographic structure of the main body and extension tube, free from internal defects; after molding, the end of the extension tube is polished to a roughness Ra≤1.6μm.

[0028] Flange connection: Weld a plate-type flat flange at the extension pipe. After welding, perform penetrant testing (PT) to ensure there are no surface cracks.

[0029] Application scenario: Used for conveying 20% ​​sulfuric acid solution. The one-piece molded structure avoids the risk of corrosion and cracking at the welded parts, while the uniform diameter design ensures smooth flow of sulfuric acid without local stagnation.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A one-piece molded pipe connection structure, characterized in that, The pipe connection structure is an integrated tee or an integrated bend connected by flanges; The integrated tee includes a tee body, wherein at least one inlet / outlet is provided with an integrally formed extension pipe, the diameter of which is the same as the diameter of the tee body at that location, the extension pipe is integrally formed with the tee body, and the end of the extension pipe is connected to a flange. The integrated bend includes a bend body, and at least one connection port of the bend body is provided with an integrally formed extension pipe. The diameter of the extension pipe is the same as the diameter of the bend body at that location. The extension pipe is integrally formed with the bend body, and a flange is connected to the end of the extension pipe. The length of the extension pipe is greater than the length of the connecting bolts used on the flange.

2. The integrally molded pipe connection structure according to claim 1, characterized in that, The extension pipe of the tee or bend should be 5-30mm longer than the length of the corresponding flange connection bolt.

3. The integrally molded pipe connection structure according to claim 1, characterized in that, The flange is connected to the extension pipe of the tee and the extension pipe of the bend by welding.

4. The integrally molded pipe connection structure according to claim 1, characterized in that, The bending angle of the main body of the bend is 30°-120°.

5. The integrally molded pipe connection structure according to claim 1, characterized in that, The tee body is either a T-type tee or a Y-type tee.

6. The integrally molded pipe connection structure according to claim 1, characterized in that, The wall thickness of the extension pipe of a tee is the same as the wall thickness of the tee body, and the wall thickness of the extension pipe of a bend is the same as the wall thickness of the bend body.

7. The integrally molded pipe connection structure according to claim 1, characterized in that, The pipe connection structure is made of metal, including stainless steel, cast iron, or carbon steel.

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