CN201875312U - Lap welding branch pipe threaded joint sealed by O-shaped rubber sealing ring - Google Patents

Abstract

The utility model relates to a lap welding branch pipe thread joint sealed by an O-shaped rubber sealing ring, which relates to a lap welding branch pipe thread joint. The utility model solves the problem that toxic gas will be released when the asbestos rubber plate is used to seal the threaded joint of the lap welding branch pipe, and the copper gasket is used for sealing, the processing is complicated, the cost is high, and the plastic deformation is insufficient or skewed, thereby affecting the sealing effect. The lap welding branch pipe threaded joint also includes a sealing ring, the sealing ring is an O-shaped rubber sealing ring, and the adjacent end faces of the branch pipe threaded joint and the lap welding flat shoulder joint are processed with annular grooves along the circumferential direction, and the annular grooves are equipped with With O-ring rubber seal. The utility model is used in all industrial fields requiring fluid transmission through pipelines, such as ships, food, and industrial automation.

Description

Lap-welded branch pipe threaded joints sealed with O-shaped rubber seals

technical field

The utility model relates to a threaded joint of lap welding branch pipes.

Background technique

The lap welded branch pipe thread joint sealed by the sealing ring is mainly used for the connection between the pipe and the branch pipe. At present, asbestos rubber sheets or copper gaskets are generally used for sealing when the threaded joints of the lap-welded branch pipes of the CB56 standard are connected to the flat shoulder joints. Asbestos rubber sheet will release toxic gas, it is not suitable for use in the confined space of ships, and has been gradually banned; the processing of copper gaskets is complicated, the cost is high, and in the process of pipeline construction, a large external force needs to be applied to make the copper gaskets Plastic deformation, so as to achieve the effect of sealing. When the construction personnel use too little or uneven force, the plastic deformation of the sealing gasket will be insufficient or skewed, and leakage will often occur; when the construction personnel apply excessive force, branch pipe joints will be formed. Damage to threaded parts.

Utility model content

The purpose of this utility model is to provide a lap welding branch pipe threaded joint sealed with O-shaped rubber sealing ring to solve the problem of the release of toxic gas when the lap welding branch thread joint is sealed with asbestos rubber plate and copper gasket for sealing, complex processing and high cost , Insufficient plastic deformation or skewing, which affects the sealing effect.

The technical scheme adopted by the utility model to solve the above-mentioned technical problems is: the lap welded branch pipe threaded joint sealed by the O-shaped rubber sealing ring of the present utility model includes a lap welded flat shoulder joint, a branch pipe threaded joint and a jacket nut, and the lap welded flat The shoulder joint and the threaded joint of the branch pipe are affixed together through the outer nut; the threaded joint of the lap welding branch pipe also includes a sealing ring, and the sealing ring is an O-shaped rubber sealing ring, and the adjacent end faces of the threaded joint of the branch pipe and the lap welding flat shoulder joint An annular groove is processed on the upper edge in the circumferential direction, and an O-shaped rubber sealing ring is arranged in the annular groove.

The utility model has the following beneficial effects: the threaded joint of the welding branch pipe of the utility model can be completely interchanged with the CB56 standard (the threaded joint of the welding branch pipe), and the threaded joint of the welding branch pipe uses an O-shaped rubber sealing ring to realize the sealing of the joint end face, which is The working medium with a pressure level below 16MPa has a good sealing effect. At the same time, because the elastic deformation of the O-shaped rubber sealing ring requires less external force, it can effectively avoid damage to the threaded part of the screw-in joint due to excessive force; place the O-shaped rubber seal The channel design of the annular groove of the ring is based on the national standard GB/T3452.1-2005 "Dimensions and Tolerances of O-shaped Rubber Seal Rings for Hydraulic Pneumatics" and GB/T3452.3-2005 "O-shaped Rubber Seal Rings for Hydraulic Pneumatics Groove" Groove size" standard, select the O-shaped rubber seal ring that meets the national standard. The utility model is suitable for the connection between the main equipment and the pipeline in the oil, water and gas system with a pressure lower than 16 MPa, which is more than 1.6 times the sealing pressure level of the threaded joint of the lap welding branch pipe of the CB56 standard, and can be completely interchanged with it. The standard O-shaped rubber sealing ring specified by the national standard is used to replace the traditional asbestos rubber plate or copper gasket, which reduces the engineering cost; through the reasonable selection of manufacturing materials, the lap welding branch pipe thread joint can be widely used in ships, food, industrial automation, etc. All industrial fields that require fluid transmission through pipelines.

Description of drawings

Fig. 1 is a front view of the utility model, Fig. 2 is a main sectional view of a branch pipe threaded joint, Fig. 3 is an A-A sectional view of Fig. 2 , and Fig. 4 is an enlarged view of part I of Fig. 2 .

Detailed ways

Specific embodiment 1: In conjunction with Fig. 1 to Fig. 4, the lap welding branch pipe thread joint sealed by O-shaped rubber sealing ring in this embodiment includes lap welding flat shoulder joint 1, branch pipe thread joint 2 and outer casing nut 3, and the lap welding The welded flat shoulder joint 1 and the threaded joint 2 of the branch pipe are fixedly connected together by the outer nut 3; the threaded joint of the lap welding branch pipe also includes a sealing ring 4, and the sealing ring 4 is an O-shaped rubber sealing ring, and the threaded joint 2 of the branch pipe and the lap joint The adjacent end faces of the welded flat shoulder joint 1 are circumferentially processed with an annular groove 2-1, and an O-shaped rubber sealing ring 4 is housed in the annular groove 2-1.

Embodiment 2: In conjunction with FIG. 3 , two planes are processed on the outer wall of the branch pipe threaded joint 2 in this embodiment, and the two planes are arranged symmetrically with respect to the center line of the branch pipe threaded joint 2 . Such setting facilitates the screwing of the branch pipe threaded joint 2 and the outer casing nut 3 . Others are the same as the first embodiment.

work process:

Lap one end of the threaded joint 2 of the branch pipe with the copper pipe 5 and weld them together; then put the O-shaped rubber sealing ring 4 into the annular groove 2-1 of the threaded joint 2 of the branch pipe, and place the other end of the threaded joint 2 of the branch pipe The outer sleeve nut 3 is fixedly connected with the lap welding flat shoulder joint 1 .

Claims (2)

1. a lap welding branch pipe threaded joint that adopts O-shaped rubber sealing ring seal, described lap welding branch pipe threaded joint comprises lap welding flat shoulder joint (1), branch pipe threaded joint (2) and overcoat nut (3), described The lap welding flat shoulder joint (1) and the branch pipe threaded joint (2) are affixed together through the overcoat nut (3); it is characterized in that: the lap welding branch pipe threaded joint also includes a sealing ring (4), and the sealing ring ( 4) It is an O-shaped rubber sealing ring. The adjacent end faces of the branch pipe threaded joint (2) and the lap welding flat shoulder joint (1) are machined with annular grooves (2-1) along the circumferential direction, and the annular grooves (2-1 ) is equipped with an O-shaped rubber sealing ring (4). 2. The lap welded branch pipe threaded joint sealed by an O-shaped rubber sealing ring according to claim 1, characterized in that: the outer wall of the branch pipe threaded joint (2) is processed with two planes, and the two planes are opposite to the branch pipe The center line of the threaded joint (2) is arranged symmetrically.

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