Weldless lightweight water heater inner container product and manufacture method thereof

Abstract

A weldless lightweight water heater inner container and a manufacture method thereof are provided; the inner container is a barrel, and comprises a barrel bottom, a barrel body and an end socket with an opening; the inner container is a one-body structure; the barrel bottom wall thickness is even; the barrel body wall thickness is smaller than the barrel bottom wall thickness; the end socket wall thickness is smaller than or equal to the barrel body wall thickness; the manufacture method comprises the following steps: allowing the center of one side of a round sheet material to abut against a core model in an arc barrel bottom shape, and using a wheel set to carry out strong common spinning on the other side of the round sheet material, thus obtaining the barrel bottom and barrel body; 2, using a clamp to clamp the barrel body, using the wheel set to spin form and neck the barrel body opening end, wherein the wheel set forming locus is an arc with an opening, thus finally obtaining the end socket with the opening. Conventional three welding lines are removed; the weldless product can reduce water heater water leakage rate, and product lightweighting can be realized, thus improving product quality and reducing cost, and solving water heater water leakage and production cost problems.

Description

technical field [0001] The invention relates to sheet material forming technology, in particular to a product and a manufacturing method of a weldless lightweight water heater liner. Background technique [0002] The inner tank of the water heater is manufactured by the traditional stamping and welding process, and the water leakage rate is relatively high. In addition, manual repair welding is required at the junction of the middle tube weld and the head ring weld, which wastes manpower and material resources. [0003] For example, Chinese Patent Publication No. CN202182565U discloses a water heater liner including a middle barrel and a right head formed by integral spinning and stretching, and the left head at the other end is connected with the middle barrel of the liner by ring welding. [0004] Chinese Patent Publication No. CN203100173U discloses a water heater liner comprising upper and lower barrels formed by one-time drawing, and the upper and lower barrels are conn...

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Problems solved by technology

[0005] The above patents still have welding seams, there is still a risk of water leakage, and it does not involve the lightweight design of the product, and it is still an equal-wall-thickness liner

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