Electric resistance heating devices – Heating devices – Tank or container type liquid heater
Patent
1994-08-29
1995-10-10
Jeffery, John A.
Electric resistance heating devices
Heating devices
Tank or container type liquid heater
392449, A47J 3154, F22B 128
Patent
active
054577675
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a water tank for heating water preferably in a vending machine for beverages, said tank comprising a feed-water inlet, a hot water outlet, as well as a heating member for heating the water.
BACKGROUND ART
The hot water tank in vending machines for beverages was previously made of metal or metal parts with the effect that the lime in the water deposited as flakes on the metal surfaces, whereby a decalcification for 2 to 3 hours was necessary 2 to 5 times annually. A manufacture of hot water tanks of plastics eliminates the frequent decalcification, but is instead encumbered with the problem of lime particles floating in the water and following said water when the hot water leaves the hot water tank, said plastics for instance being polypropylene which is particularly resistant to lime deposits on the surfaces. The lime particles are formed by lime crystals, which in turn result from the process
The lime crystals deposit as small particles in the water instead of on the inner side of the water tank. These small particles act as germs to larger lime crystals, which at first float in the water, and later on settle. The CaCO.sub.3 -crystals are of a larger density than water and do not settle immediately because the resulting CO.sub.2 deposits on the crystals and thereby keeps said crystals floating until they have reached a predetermined size.
When the water tank is used, a considerable amount of lime crystals is constantly floating in the water. These crystals can both act on the delivery functions inter alia by settling in the closing mechanisms of the valves, and cause inconvenience to the customer as the water delivered, such as a beverage, will contain visible lime crystals.
DESCRIPTION OF THE INVENTION
The object of the present invention is to provide a water tank ensuring such a precipitation of lime that the delivered hot water is substantially free of lime particles.
The water tank according to the invention is characterised in that the water tank is divided into a heating section including the hot water outlet and the heating member, as well as a lime-precipitating section including the feed-water inlet, said tank being divided by means of a partition extending from one side of the water tank immediately adjacent the surface of the water at maximum water level and obliquely downwards towards the opposite side of said water tank and then further at a distance from the tank wall downwards to the immediate vicinity of the bottom of said water tank, whereby the heating section is placed below the oblique portion of the partition, that an upper flow passage for water is provided between the heating section and the lime-precipitating section at the upper end of the oblique portion of the partition, and that a lower flow passage for water is provided between the lime-precipitating section and the heating section at the lower rim of the partition.
In this manner a water tank is provided which ensures removal of all the lime particles from the water to be dispensed. This advantage is obtained by the partition with flow passages at the top and at the bottom acting as a guiding screen, which ensures that a controlled circulation is obtained. The controlled circulation is initiated as soon as the heating member is turned on, especially each time fresh feeding water is supplied to the water tank through the feed-water inlet. The heated water rises from the heating member and initiates a circulation conveying newly formed lime crystals to the opposite side of the partition and into the lime-precipitation section through the upper flow passage. As the partition extends obliquely downwards from one side of the water tank to the opposite side, only a rather small surface area is left above the heating member with the result that all the lime particles following the upward movement during the circulation are immediately carried directly upwards through the upper flow passage and into the lime-precipitation section. In the lime-precipitating section, the lime particles ha
REFERENCES:
patent: 3291965 (1966-12-01), Hatch
patent: 3381111 (1968-04-01), Popyk
Jeffery John A.
Wittenborg A/S
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