A new type of three-pronged tube for an angle tube boiler

Abstract

The utility model discloses a novel three-prong pipe of angle tube boiler, it includes linear main pipe and curved branch pipe, and the first end of branch pipe is arranged in the middle of main pipe and communicates with main pipe, and branch pipe is integrally formed with main pipe and is made through forging piece processing. The utility model discloses a novel three-prong pipe of angle tube boiler evaporimeter is all changed into the forging three-prong pipe form from the welding structure, and the technology is upgraded, and through eliminating the thinnest weak weld joint link, fundamentally solve the industry pain point of difficult flaw detection and difficult guarantee of weld quality, greatly improve the safety and reliability of angle tube boiler operation.

Description

Technical Field

[0001] This utility model relates to the technical field of three-way tubes for corner tube boilers, and specifically to a novel three-way tube for corner tube boilers. Background Technology

[0002] The pressurized body of a corner-tube boiler is supported by a tube cage structure composed of unheated drain pipes and return pipes located at the corner, along with the steam drum and upper and lower headers. All heated surfaces are then welded to the tube cage to form a closed shell. The evaporator tube bundle, constrained by the tube cage structure of the water-cooled walls on both sides, requires a three-way branch pipe structure. Currently used traditional welded three-way branch pipes typically include U-shaped main and branch pipes, with complex geometry, numerous curved surfaces and dead angles, making assembly and welding difficult, and weld quality hard to guarantee. Furthermore, post-weld flaw detection is difficult, with many areas unable to be effectively inspected or yielding unreliable results. Utility Model Content

[0003] The purpose of this invention is to provide a novel three-way tube for a corner tube boiler to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model provides a novel three-way pipe for a corner tube boiler, which includes a straight main pipe and a curved branch pipe. The first end of the branch pipe is located in the middle of the main pipe and is connected to the main pipe. The branch pipe and the main pipe are integrally formed and are manufactured by forging.

[0005] Furthermore, the angle between the centerline of the first end of the branch pipe and the centerline of the main pipe is 45°.

[0006] Furthermore, the second end of the branch pipe is a straight line parallel to the main pipe.

[0007] Furthermore, the end face of the second end of the branch pipe is flush with the end face of the corresponding end of the main pipe.

[0008] Furthermore, it also includes a reinforcing steel plate, the two ends of which are connected to the outer surfaces of the first ends of the main pipe and the branch pipe, respectively.

[0009] Furthermore, the steel plate is integrally formed with the main pipe and branch pipes.

[0010] The beneficial effects of this utility model are as follows: This utility model upgrades the technology by changing the three-way pipe of the evaporator of the corner tube boiler from a welded structure to a forged three-way pipe. By eliminating the weakest weld joint, it fundamentally solves the industry pain points of difficult flaw detection and difficult weld quality assurance, and greatly improves the safety and reliability of the corner tube boiler operation. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0012] Among them: 1. Main pipe; 2. Branch pipe; 3. Reinforcing steel plate. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one embodiment of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] To make the objectives, technical solutions and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0015] In the following description, references to "an embodiment," "an embodiment," "an example," "example," etc., indicate that the described embodiment or example may include a particular feature, structure, characteristic, property, element, or limitation, but not every embodiment or example necessarily includes that particular feature, structure, characteristic, property, element, or limitation. Furthermore, the repeated use of the phrase "an embodiment according to this application," while possibly referring to the same embodiment, does not necessarily refer to the same embodiment.

[0016] like Figure 1 As shown, this utility model discloses a novel three-way pipe for a corner tube boiler, which includes a straight main pipe 1 and a curved branch pipe 2. The first end of the branch pipe 2 is located in the middle of the main pipe 1 and is connected to the main pipe 1. The branch pipe 2 and the main pipe 1 are integrally formed and are manufactured by forging.

[0017] The three-way pipe of this invention is a single-piece molded component, eliminating the intersecting weld between the main pipe 1 and the branch pipe 2, thus solving the weld problem. Without weld stress concentration and potential defects, the forged three-way pipe exhibits excellent fatigue resistance under the alternating stress caused by boiler start-up and shutdown and load changes, greatly reducing the risk of fatigue-induced cracking.

[0018] Furthermore, the forging process breaks down the casting defects inside the steel ingot (such as porosity and air holes), and through plastic deformation, the metal flow lines are continuously distributed along the shape of the tee, and the grains are refined, making the strength, toughness and fatigue life of the forging far superior to that of the welded parts.

[0019] With the adoption of forged three-way pipes, the only area requiring flaw detection is no longer the complex intersecting weld seams, but simply the conventional circumferential weld seams where it connects to the external evaporator pipe. The flaw detection process for these circumferential weld seams is mature and simple, and both ultrasonic and radiographic testing can be easily and reliably implemented, yielding highly accurate test results.

[0020] This invention upgrades the technology by replacing the welded structure of the three-way pipe in the evaporator of a corner tube boiler with a forged three-way pipe. By eliminating the weakest weld joint, it fundamentally solves the industry pain points of difficult flaw detection and weld quality assurance, greatly improving the safety and reliability of corner tube boiler operation.

[0021] In one embodiment, the angle between the centerline of the first end of the branch pipe 2 and the centerline of the main pipe 1 is 45°.

[0022] The one-piece forged structure, combined with a 45° included angle design, makes the geometry of the new three-way tube more regular and simple. Compared with traditional three-way tubes with complex curved surfaces and many dead angles, the positioning and installation of the workpiece are easier during assembly, reducing assembly errors and difficulties caused by structural complexity.

[0023] In the welding process with the external evaporator pipe, the connection between branch pipe 2 and main pipe 1 at a 45° angle is relatively regular, with a clear welding path and better space and visibility for welding operations. This reduces the difficulty of welding, improves welding efficiency, and also helps ensure welding quality and reduce the occurrence of welding defects. Furthermore, the 45° angle connection does not have complex hidden areas. During post-weld flaw detection, whether using radiographic testing, ultrasonic testing, or other non-destructive testing methods, the weld can be inspected more comprehensively and accurately.

[0024] In one embodiment, the second end of the branch pipe 2 is a straight line parallel to the main pipe 1.

[0025] The first end of branch pipe 2 forms a 45° angle with the main pipe 1, allowing for a smoother directional change of the fluid as it enters branch pipe 2 from the main pipe 1. This avoids significant energy loss due to fluid impacting the pipe wall caused by excessively large or small angles. The second end of branch pipe 2 is parallel to the main pipe 1, ensuring that the fluid exiting branch pipe 2 also enters subsequent pipelines in a relatively stable direction. This results in smoother flow and reduced flow resistance within the three-way branch pipe. Furthermore, within the limited installation space of a corner-tube boiler, this three-way branch pipe structure allows for a more rational layout, reducing interference with other components. The straight second end of branch pipe 2 facilitates easier connection to other parallel pipelines, improving the utilization efficiency of the boiler system's internal space and making the overall boiler structure more compact.

[0026] In one embodiment, the end face of the second end of the branch pipe 2 is flush with the end face of the corresponding end of the main pipe 1. This provides a clear positioning reference for installers. During installation, installers can more accurately connect the three-way pipe with other fittings and structural components, reducing adjustments and corrections during installation and improving installation efficiency and accuracy.

[0027] In one embodiment, a reinforcing steel plate 3 is further included, with both ends of the reinforcing steel plate 3 connected to the outer surfaces of the first ends of the main pipe and the branch pipe, respectively. This effectively adds a strong supporting structure at the critical connection point between the main pipe and the branch pipe. During boiler operation, the pressure and thermal stress generated by the fluid inside the pipes exert significant forces on the connection between the main pipe and the branch pipe. The reinforcing steel plate 3 can disperse these stresses, preventing stress concentration at the connection point, thereby greatly enhancing the strength of the connection.

[0028] In one embodiment, the reinforcing steel plate 3 is integrally formed with the main pipe and branch pipes, which increases the strength of the three-way pipe while eliminating weld seam issues. This ensures that the connection between the reinforcing steel plate 3 and the main pipe and branch pipes has extremely high precision and consistency, making the entire three-way pipe a continuous and complete whole. The stress transmission between each part is more uniform, and it can withstand greater external forces and internal pressures.

[0029] The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A novel three-way tube for a corner tube boiler, characterized in that: It includes a straight main pipe and a curved branch pipe. The first end of the branch pipe is located in the middle of the main pipe and is connected to the main pipe. The branch pipe and the main pipe are integrally formed and are manufactured by forging.

2. The novel three-way tube for a corner tube boiler according to claim 1, characterized in that: The angle between the centerline of the first end of the branch pipe and the centerline of the main pipe is 45°.

3. The novel three-way tube for a corner tube boiler according to claim 1, characterized in that: The second end of the branch pipe is a straight line parallel to the main pipe.

4. A novel three-way tube for a corner tube boiler according to claim 3, characterized in that: The end face of the second end of the branch pipe is flush with the end face of the corresponding end of the main pipe.

5. A novel three-way tube for a corner tube boiler according to claim 1, characterized in that: It also includes a reinforcing steel plate, the two ends of which are connected to the outer surfaces of the first ends of the main pipe and the branch pipe, respectively.

6. A novel three-way tube for a corner tube boiler according to claim 5, characterized in that: The reinforced steel plate is integrally formed with the main pipe and branch pipes.

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