Electrical liquid heating apparatus
OwnerIngo Bleckmaninventor
Life of this patent
Estimating the term…
Abstract
A liquid heating apparatus comprises a container or vessel having disposed therein a tubular heater member which is bent in a double loop configuraton with a raised central portion thereof being welded or soldered in a strip configuration, having low thermal conductivity, that substantially bridges mutually spaced ends of such tubular heater member which are attached to a mounting plate supported by the container. A thermally actuated cut-out switch bears against the plate from the outside of the container and is adapted to respond in a sensitive fashion to heat transfer from the adjacent central portion of the tubular heater member in the event of thermal overloading or running dry of the tubular heater member.
Claims24
An electrical liquid-heating apparatus, comprising a vessel having a peripheral side wall and a bottom, for receiving a liquid to be heated therein;
- openings in said side wall in the vicinity of the bottom of said vessel;
- a tubular heater member disposed in said vessel and having connection end portions mutually spaced apart and extending through respective ones of said openings, said tubular heater member being of a double loop configuration such as to provide a central section disposed in the vicinity of said connection end portions, said central section including an at least substantially straight portion which is disposed above and bridges over the space between said connection end portions;
- a mounting plate of poor thermal conductivity connected to said tubular heater member and fastened against said side wall of said vessel, said at least substantially straight portion of said central section being joined along its length by a fusion-type join to said plate, to provide a thermal bridge between said central section and said plate;
- sealing means interposed between said side wall of the vessel and said plate to seal said openings;
- clamping screw means passing through respective ones of said openings in said side wall of said vessel thereby to fix said plate in position thereon;
- and a thermally operable switch disposed outside said vessel and in contact with said plate and operable in response to a given temperature being exceeded to switch off said tubular heater member.
An electrically operated liquid-heating apparatus, comprising a tubular heater member bent in such a fashion as to form twin loop configurations and having end portions mutually spaced apart and adapted to pass through respective openings in the peripheral wall of a vessel that is adapted to receive a liquid to be heated, said tubular heater member having a central section disposed in the vicinity of said end portions and including on at least substantially straight portion which is disposed above and bridges over the space between said end portions;
- a mounting plate member carried by said connection end portions of the tubular heater member and adapted to fit against said peripheral side wall of said vessel and being provided with openings for receiving said connection end portions, said plate member comprising a material which is a poor thermal conductor thereby to reduce transfer of heat from said connection end portions to said side wall of said vessel;
- means for fixing said plate member in position on said side wall of said vessel;
- sealing means carried by said plate for fitting against the inside surface of said wall of said vessel for sealing said openings in said side wall of said vessel;
- and a thermally operated switch adapted to switch off said tubular heater member when a given temperature is exceeded, said switch being adapted to fit into a receiving opening in said side wall of said vessel for placement externally of said vessel;
- and a fusion-type join connecting said central section of said tubular heater member in heat-conducting relationship with said plate member along the length of said substantially straight portion of said central section, thereby to provide for transfer of heat from said central section of said tubular heater member to said switch.
Dependencies are inferred from the claim text.