Barrel mounting type large-caliber thick-wall connecting pipe of boiler and pressure vessel and connecting method

A pressure vessel and large-diameter technology, which is applied in the direction of non-detachable pipe connections, pipes/pipe joints/fittings, passing components, etc., can solve the problems of long cycle time, small processing volume, and low efficiency, so as to improve production efficiency and manufacture The effect of process simplification and economic benefit optimization

CN107975642AActive Publication Date: 2018-05-01HARBIN BOILER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-05-01

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Abstract

The invention discloses a barrel mounting type large-caliber thick-wall connecting pipe of a boiler and a pressure vessel and a connecting method. For a long time, welding grooves of barrel mounting type or seat type large-caliber thick-wall connecting pipes (called large connecting pipes for short) of boilers, pressure vessels, nuclear power and other pressure-bearing equipment are most in a saddle-shaped curved face form, and along with constant changing of shapes of surfaces around barrel holes, the structural forms of the grooves are single. The problems that the flame gas cutting qualityis poor, hardening layers on the surfaces of the grooves are not ground and removed thoroughly, the numerical control machining period is long, and the manufacturing cost is high exist. The barrel mounting type large-caliber thick-wall connecting pipe comprises a connecting pipe body. The shape of a welding groove on the bottom face of the connecting pipe is formed by multiple planar welding grooves, a welding groove of the type D is formed by the welding groove and the outer surface of a barrel, and the tilt angle of each planar welding groove ranges from -35 degree to 40 degrees. The barrelmounting type large-caliber thick-wall connecting pipe is applied to design and manufacturing of the manual welding rod arc welding groove structure of the barrel mounting type large-caliber thick-wall connecting pipe of the boiler and the pressure vessel.
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Description

Technical field:

[0001] The invention relates to a large-diameter thick-wall connecting pipe placed in a boiler and a pressure vessel cylinder and a connection method, and relates to the field of design and manufacture of pressure-bearing equipment such as boilers, pressure vessels and nuclear power equipment, and is used for supercritical, supercritical Supercritical power station start-up separators and water storage tanks and other large pipes, specifically related to similar structures and sizes of pressure equipment cylinders or cones placed large-diameter thick-walled pipes or flanges with manual electrode arc welding Welding groove structure design and manufacturing techniques. Background technique:

[0002] For a long time, most of the welding grooves of boilers, pressure vessels, nuclear power and other pressure-bearing equipment cylinders placed or seated large-diameter thick-walled pipes (referred to as large pipes) are in the form of saddle-shaped curved surfaces...

Examples

Embodiment 1

[0028] A large-diameter thick-walled connecting pipe for boilers and pressure vessels, which consists of a connecting pipe body, the shape of the welding groove on the bottom surface of the connecting pipe includes four intersecting planes, forming a Class D weld groove with the outer surface of the cylinder, The inclination angle of the plane welding groove is between -35° and 40°.

Embodiment 2

[0030] According to the large-diameter thick-walled connecting pipe of the boiler and pressure vessel described in Embodiment 1, the four intersecting planes are composed of two pairs of symmetrically arranged plane welding grooves, one pair of which is located in the axial direction of the cylinder. The inclination angle of the plane welding groove is 15°~40°, and the inclination angle of the plane welding groove at a position 90 degrees to it is -35°~35°.

Embodiment 3

[0032] According to the large-diameter thick-walled nozzle placed on the cylinder of the boiler and pressure vessel described in Embodiment 1, the four intersecting planes include two pairs of symmetrically arranged plane welding grooves, and one pair of plane welding grooves located in the axial direction of the cylinder The groove is a pair of combined plane welding grooves, the combined plane welding groove is a folded groove composed of two planes, and the inclination angle of the plane welded groove on the inner plane of the folded groove is between 25° and 40° , the inclination angle of the plane welding groove on the outer plane of the folding surface groove is 5°~20°, and the inclination angle of the other pair of plane welding grooves at 90° to the axial direction of the cylinder is -35°~35°.