1. What is the manufacturing process of the hot water kettle?
The core component of thermos bottle is bottle liner. There are four steps in making bottle liner:
Bottle blank preparation
Glass for thermos bottles belongs to commonly used soda-lime silicate glass. Take the homogeneous high-temperature molten glass without impurities, and blow it into an inner glass bottle blank and an outer glass bottle blank with a wall thickness of 1 ~ 2mm in a metal mold (see glass manufacturing).
Bile blank
The inner bottle is placed in the outer bottle, the bottle mouth is sealed into a whole, and the bottom of the outer bottle is provided with a silver-plated suction duct. This glass structure is called bottle blank. There are three main methods to make glass bottle liner: bottom-pulling sealing method, shoulder-shrinking sealing method and waist-joining sealing method. Bottom-pulling sealing method is to cut the inner bottle blank and the outer bottle blank to cut the bottom. The inner bottle is inserted from the bottom of the outer bottle, fixed with asbestos plug, then the bottom of the outer bottle is rounded and closed, connected with a small tail pipe, and the two bottle mouths are fused and sealed. Shoulder sealing method is to cut the inner bottle blank and the outer bottle blank. The inner bottle is inserted from the upper end of the outer bottle and fixed with asbestos plug insert. The outer bottle shrinks the shoulder of the harvesting bottle, the two bottle mouths are fused and sealed, and then the small tail pipe is connected. The waist sealing method is to cut the inner bottle blank, the outer bottle blank and the waist into two sections, put the inner bottle into the outer bottle, weld the waist again and connect the small tail pipe.
Silver plating on
A certain amount of silver ammonia complex solution and aldehyde solution as reducing agent were poured into the interlayer of the bottle liner through a small tail pipe for silver mirror reaction, and silver ions were reduced and deposited on the glass surface to form a thin mirror silver film.
pick up the suction
Connect the tail pipe of silver-plated double-layer bottle blank with vacuum system and heat it to 300 ~ 400℃ to promote the release of various adsorbed gases and residual moisture from glass. At the same time, when the vacuum degree of the interlayer space of the bottle liner reaches 10-3 ~ 10-4 mmhg, the tail pipe is sealed with a vacuum pump.
Second, how to check the insulation of the hot water kettle?
1. Check whether the milk suction head (i.e. suction nozzle) at the end of the bottle liner is intact. If it is broken, it will destroy the vacuum between the interlayer of the bottle and lose the heat preservation ability.
2. Check the bottle for signs of breakage. 3. See if the bottle mouth is round. If the bottle mouth is not round, the cork cannot be sealed, which will reduce the heat preservation ability.
4. Check whether the asbestos pad shifts or falls off. Asbestos pads are three circular black spots in the middle of the bottle liner, which are supported between the inner and outer liner. If it shifts or falls off, the bottle liner will burst because it can't withstand proper water pressure.
Hot water kettle is closely related to people's work and life, which brings great convenience to our life.