Small-sized portable air brazing welding gun

Abstract

The invention discloses a small-sized portable air brazing welding gun. Air inlets which are communicated are formed on an air mixer, an adjusting valve component is formed by connecting an adjusting hand wheel, a shaft and nuts by screws and is matched with a reducing spring in a spring base, the spring base is arranged in a round nut, and the round and adjusting nuts are connected to the inner wall of a shell of a reducing valve; and a filter I is arranged in a thimble of an air bottle, a filter II and an air needle spring are arranged in an air needle base, a steel needle is also fixed on an air needle with an air needle sealing gasket, one end face of a disc-shaped bowl contacts the steel needle, and the other end of the disc-shaped bowl is matched and assembled with a sealing gasket which is tightly adhered to the spring base. The small-sized portable air brazing welding gun has the advantages that: the complete separation of liquid and air-phase gas is realized by setting two stages of filters, and combustible liquid-phase components cannot enter a gas channel, so that the phenomena of incomplete combustion and red flame are radically prevented; the reducing valve component has the dual functions of pressure adjustment and backfire prevention and can automatically close a flow channel of a gas bottle in case of backfire, so that hazard safety accidents caused by backfireare radically avoided and the safety of the gas bottle is guaranteed at the same time; and the small-sized portable air brazing welding gun is easy to operate, wide in application range, comfortable in handfeel and portable.

Description

technical field [0001] The invention relates to a welding torch, in particular to a small portable gas brazing welding torch used for various non-ferrous metal pipes or repairing parts on the maintenance site. Background technique [0002] At present, gas brazing welding technology and welding torches have been widely used, especially in the chemical industry, refrigeration, and household appliances industries. Portable gas brazing welding torches are used for on-site maintenance services. Because of their small size, they do not require gas cylinders and are easy to carry. , concentrated firepower at welding points, and easy operation make this type of miniaturized portable gas brazing torch favored by many users. [0003] Patent No. 90222738.6 "Portable Welding Torch" also provides a portable small welding torch that makes the flame spray out in a pointed shape and makes the flame temperature reach 1600°C, but because it has no gas pressure adjustment device and no automat...

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Problems solved by technology

[0003] Patent No. 90222738.6 "Portable welding torch" also provides a portable small welding torch that makes the flame spray out in a pointed shape and makes the flame temperature reach 1600°C, but because it has no gas pressure adjustment device and no automatic ignition device, the scope of use Restricted and inconvenient to operate, unable to meet user requirements, poor practicability

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