Large-pipe-diameter eccentric reducing inclined three-way pipe

Abstract

The utility model discloses a large-pipe-diameter eccentric reducing inclined three-way pipe which is located between a main pipe and a branch pipe and comprises an inclined three-way main pipe, an inclined three-way branch pipe and a joint face located at the joint of the inclined three-way main pipe and the inclined three-way branch pipe. The joint surface is in a saddle shape; the inclined three-way branch pipe is an eccentric reducing pipe, the radial section of the inclined three-way branch pipe is in a circular ring shape, and the inner diameter and the outer diameter of the inclined three-way branch pipe are gradually increased in the direction close to the inclined three-way main pipe. The inscribed angle at the joint surface is increased from alpha to alpha + theta, the contact angle is increased, the stress of a welding seam is reduced, the structural safety of a pipe fitting is improved, and the possibility of tension crack of the welding seam is reduced; in addition, the external connection angle alpha at the joint surface is kept unchanged while the internal connection angle at the joint surface is increased, the length of the inclined tee pipe fitting in the radial direction of the main pipe is reduced, the size of the inclined tee is optimized, and the arrangement space is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tee pipes, in particular to a large-diameter eccentric reducing-diameter inclined tee pipe. Background Art

[0002] Existing pipelines usually contain various specifications of oblique tees. Tee fittings are a form of pipeline connection, which has the function of diverting / converging the fluid in the main pipe. They are divided into straight tees and oblique tees according to the connection angle between the branch pipe and the main pipe. The oblique tee is a three-way pipeline with a certain angle between the main pipe and the branch pipe. Compared with the straight tee, it has the characteristics of smooth flow and small local resistance. Large-diameter steel oblique tees are generally manufactured by welding. The smaller the angle between the branch pipe and the main pipe, the smoother the flow and the smaller the space occupied by the pipe fitting. However, the smaller the angle between the main pipe and the branch pipe, the more concentrated the stress at the intersection line, and fatigue is prone to occur at the weld, and even the weld cracks, which is not conducive to the safe use of the oblique tee fittings. Figure 1 As shown, the existing oblique tees generally solve the above problem by increasing the wall thickness of the oblique tee pipe or using a large-angle oblique tee, but the oblique tee is large in size and occupies a large layout space.

[0003] Therefore, it is urgent to propose a new solution to solve the above problems. Summary of the invention

[0004] The utility model provides a large-diameter eccentric reducing oblique tee pipe, which can solve the problem in the prior art that the oblique tee is large in size and occupies a large layout space by increasing the wall thickness of the oblique tee pipe fitting or adopting a large-angle oblique tee.

[0005] The utility model provides a large-diameter eccentric reducing oblique tee pipe, which is located between a main pipe and a branch pipe. The large-diameter eccentric reducing oblique tee pipe comprises an oblique tee main pipe, an oblique tee branch pipe and a connection surface at the connection between the oblique tee main pipe and the oblique tee branch pipe.

[0006] The shape of the connecting surface is a saddle shape;

[0007] The oblique tee branch pipe is an eccentric reducer pipe, and the radial cross section is annular, and the inner diameter and the outer diameter gradually increase in the direction close to the oblique tee main pipe.

[0008] Furthermore, the oblique three-way branch pipe is an eccentric reducer.

[0009] Furthermore, the eccentric angle of the oblique three-way branch pipe is θ, the circumscribed angle at the connecting surface is α, and the inscribed angle at the connecting surface is θ+α.

[0010] Furthermore, the eccentric angle θ has a value range of 5 to 20°.

[0011] Furthermore, the oblique tee main pipe and the oblique tee branch pipe are fixedly connected by welding.

[0012] Furthermore, the diameter D1 of the main pipe is not less than 2 m.

[0013] Furthermore, the maximum pipe diameter D3 of the oblique tee branch pipe is not greater than the pipe diameter D1 of the main pipe.

[0014] Compared with the prior art, the internal angle at the connection surface of the utility model is increased from α to α+θ, the contact angle is increased, and the weld stress is reduced, which is beneficial to increase the structural safety of the pipe fitting and reduce the possibility of weld cracking; in addition, while increasing the internal angle at the connection surface, the external angle at the connection surface remains unchanged α, reducing the length of the oblique tee pipe fitting in the radial direction of the main pipe, optimizing the size of the oblique tee, and reducing the layout space. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a large-diameter inclined tee pipe in the prior art;

[0016] Figure 2 This is a schematic diagram of the structure of the large-diameter eccentric reducing-diameter oblique tee pipe of the utility model;

[0017] Figure 3 It is a schematic diagram of the cutting sample of the inclined three-way branch pipe of the utility model;

[0018] Figure numerals: 1, oblique tee main pipe; 2, oblique tee branch pipe; 3, connecting surface; 4, main pipe; 5, branch pipe. DETAILED DESCRIPTION

[0019] In order to further understand the content, features and functions of the utility model, the following embodiments are given, together with the attached Figures 2-3 The detailed instructions are as follows.

[0020] like Figure 2 As shown, this embodiment provides a large-diameter eccentric reducing oblique tee pipe, which is located between the main pipe 4 and the branch pipe 5. The large-diameter eccentric reducing oblique tee pipe comprises an oblique tee main pipe 1, an oblique tee branch pipe 2, and a connection surface 3 located at the connection between the oblique tee main pipe 1 and the oblique tee branch pipe 2. The connection surface 3 is saddle-shaped. The connection between the branch pipe 5 and the main pipe 4 is made into the saddle shape, and then the branch pipe 5 is connected to the saddle mouth of the main pipe 4 and then fixedly connected by welding.

[0021] The inclined tee branch pipe 2 is an eccentric reducer, and its radial cross section is annular, and the inner diameter and outer diameter gradually increase in the direction close to the inclined tee main pipe 1. Figure 3 Schematic diagram of the cutting sample is shown below.

[0022] In this embodiment, Figure 2As shown, the eccentric angle of the above-mentioned inclined tee branch pipe 2 is θ, wherein the eccentric angle θ is 10°, but other values ​​between 5 and 20° may also be used. The external angle at the above-mentioned connecting surface 3 is α, and the internal angle at the above-mentioned connecting surface 3 is θ+α. The internal angle at the connecting surface of the utility model is increased from α to α+θ, the contact angle is increased, and the weld stress is reduced, which is beneficial to increase the structural safety of the pipe fitting and reduce the possibility of weld cracking; in addition, while increasing the internal angle at the connecting surface, the external angle at the connecting surface remains unchanged at α, reducing the length of the inclined tee pipe fitting in the radial direction of the main pipe, optimizing the size of the inclined tee, and reducing the layout space.

[0023] In this embodiment, the above-mentioned oblique tee main pipe 1 and oblique tee branch pipe 2 are both formed by cutting and blanking a whole piece of steel plate and then rolling and welding.

[0024] This embodiment is mainly for large diameter tee pipes. The diameter D1 of the main pipe 4 is generally not less than 2m. The diameter of the inclined tee main pipe 1 close to the main pipe 4 is also D1. The inclined tee main pipe 1 and the inclined tee branch pipe 2 are respectively rolled by steel plates and then welded as a whole. Due to the large diameter of the pipe, it is difficult to ensure that the connecting surface has an arc shape. Small diameter pipe parts can be integrally cast, and the connecting surface can be an arc shape. In addition, Figure 2 As shown, the smallest diameter of the inclined tee branch pipe 2 is at the uppermost end, which is D2, and the largest diameter is at the lowermost end, which is D3, wherein the largest diameter D3 is not greater than the diameter D1 of the main pipe 4.

[0025] The utility model described above in the present invention only expresses the implementation method of the utility model embodiment, and cannot be understood as limiting the scope of the utility model patent, nor is it any form of limitation on the structure of the utility model embodiment. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model embodiment, several changes and improvements can be made, which all belong to the protection scope of the utility model embodiment.

Claims

1. A large-diameter eccentric reducing oblique tee pipe, located between a main pipe (4) and a branch pipe (5), the large-diameter eccentric reducing oblique tee pipe comprising an oblique tee main pipe (1), an oblique tee branch pipe (2), and a connection surface (3) located at the connection between the oblique tee main pipe (1) and the oblique tee branch pipe (2), characterized in that: The shape of the connecting surface (3) is a saddle shape; The oblique tee branch pipe (2) is an eccentric reducer pipe, the radial cross-section of the oblique tee branch pipe (2) is annular, and the inner diameter and the outer diameter both gradually increase in the direction approaching the oblique tee main pipe (1).

2. The large-diameter eccentric reducing oblique tee pipe according to claim 1, characterized in that: The eccentric angle of the oblique three-way branch pipe (2) is θ, the external angle at the connecting surface (3) is α, and the internal angle at the connecting surface (3) is θ+α.

3. The large-diameter eccentric reducing oblique tee pipe according to claim 2, characterized in that: The eccentric angle θ has a value range of 5 to 20°.

4. The large-diameter eccentric reducing oblique tee pipe according to claim 1, characterized in that: The oblique three-way main pipe (1) and the oblique three-way branch pipe (2) are fixedly connected by welding.

5. The large-diameter eccentric reducing oblique tee pipe according to claim 1, characterized in that: The diameter D1 of the main pipe (4) is not less than 2 m.

6. The large-diameter eccentric reducing oblique tee pipe according to claim 5, characterized in that: The maximum pipe diameter D3 of the branch pipe (5) is not greater than the pipe diameter D1 of the main pipe (4).

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