Electric heating – Heating devices – Resistive element: igniter type
Patent
1983-10-19
1986-02-25
Bartis, A.
Electric heating
Heating devices
Resistive element: igniter type
122 40, 219275, 219302, F22B 2716, F22B 128, H05B 300
Patent
active
045729433
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a steam generator intended to generate steam, for example, for dish washers in hospitals and industrial premises.
At dish washers, for which high temperatures are desired, steam is used by injecting it into the device in question.
The present invention primarily relates to small-size dish washers and disinfection apparatuses of the type used, for example, in nursing departments in hospitals.
One problem with known steam generators for this purpose lies in their intermittent operation. After having been in use, a period of several hours may pass before it is used again.
At present, therefore, maintenance heat is used for holding hot water available all the time. According to calculations, of the energy consumption for a water heater for said purpose up to about 60% is used for maintaining water hot during periods in which hot water is not in demand.
The reason why water is maintained hot is because it takes an unacceptably long time to heat water from room temperature until the necessary amount of hot water at the required temperature is produced.
The present invention solves the aforesaid problem.
The present invention, thus, relates to a steam generator, which is intended for intermittent use, and which comprises a body, in which a water-conducting passageway and hollow spaces for electric resistance elements are located, and which is characterized, in that the body is cylindrical and homogenous, that said passageway is located axially and symetrically, and one or more radial passageways extend therefrom out of the body, and that the body externally is provided with a heat insulating material, which is enclosed in a casing of a material, of which at least its inner surface is reflective.
The invention is described in greater detail in the following, with reference to the accompanying drawing, in which an embodiment of the invention is shown by way of example, and in which
FIG. 1 is a longitudinal section of a steam generator according to the invention,
FIG. 2 is a cross-section along the line A--A in FIG. 1, and
FIG. 3 illustrates a further embodiment of the steam generator shown in FIG. 1.
In FIG. 1 a steam generator according to the invention is given the general designation 1 and comprises a body 2 with a water-conducting passageway 3 extending axially therein. One or more radial passageways 4,5 are provided to conduct steam out of said body 1 as indicated by the arrows 6.
Electric resistance elements 7 of cylindrical shape are inserted in expedient hollow spaces 8,9,10 in the body 1, which hollow spaces are located in parallel with the axial passageway 3. Said body 1 is homogeneous and made of a material with good thermal conductivity, preferably aluminium.
The body 1 is externally provided with a heat insulating material 11, which is enclosed in a casing 12 of a material, at least the inner surface of which is reflective. According to a preferred embodiment, the heat insulating material is mineral wool. The casing 12, according to a preferred embodiment, is made of aluminium sheet metal.
The heat insulating material has a substantial thickness, i.e. of the same magnitude as the radius of the body 1.
The steam generator operates as follows.
The body 1 is heated by means of the resistance elements 7 to a temperature above the steam-forming temperature for water, for example 120.degree. C.-200.degree. C., but temperatures even up to 300.degree. C. can be of interest. When the body has assumed a temperature of about 160.degree. C., cold water is led into the passageway 3, as indicated by arrow 13, by action of a solenoid valve 14, which also can act as a check valve. The water is atomized via a nozzle 15 and a lime filter and flows out as steam through the passageways 4,5.
The nozzle 15 is provided to atomize the water before its vaporization.
According to a preferred embodiment, the device for atomizing the water consists of a nozzle 15' which extends along at least the greater part of the length of the passageway 3 and sprays atomized water against the walls of the passageway
REFERENCES:
patent: 220712 (1879-10-01), Everding
patent: 1475589 (1923-11-01), Marden
patent: 2097581 (1937-11-01), Beyrodt
patent: 2576976 (1951-12-01), Stagner
patent: 2606272 (1952-08-01), Platt
patent: 2615215 (1952-10-01), Stagner
Acela Pump AB
Bartis A.
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