Immersion heaters including sheet metal heat conduction link
AssigneeStrix Limited
InventorJohn C. Taylor
Life of this patent
Estimating the term…
Abstract
An immersion heater includes a heating element having a return portion around which is wrapped a thermally conductive link. The link extends through a plastic head and seal member, by which the element is mounted in an opening in a wall of a heating chamber, and has a first portion bent down to cooperate with a bimetallic actuator of a thermally responsive control, which operates in the event that the element overheats. A second portion of the link is bent upwardly, its upper end cooperating with a thermally deformable member of the control which, in the event that the actuator fails to operate, will deform so as to disconnect the power supply to the element.
Claims29
An electric immersion heater comprising:
- a metal sheathed heating element formed to provide two end portions and an intermediate return portion adjacent the end portions;
- and
- a heat conduction link of sheet material of high thermal conductivity attached at a first end to and extending substantially completely around the return portion of the element in good thermal contact therewith, a second end of the heat conduction link and the end portions of the element being arranged so that in use they are adapted to extend through sealing means disposed in at least one opening in a wall of a liquid heating chamber such that, from outside the chamber, electrical connections can be made to the end portions of the element and thermally-responsive control means can be associated with the second end of the heat conduction link.
An electric immersion heater comprising:
- a metal sheathed heating element formed to provide two end portions and an intermediate return portion adjacent the end portions;
- and
- a heat conduction link of sheet material of high thermal conductivity attached at a first end to and extending substantially completely around the return portion of the element in good thermal contact therewith, a second end of the heat conduction link and the end portions of the element being arranged so that in use they are adapted to extend through sealing means disposed in at least one opening in a wall of a liquid heating chamber such that, from outside the chamber, electrical connections can be made to the end portions of the element and thermally-responsive control means can be associated with the second end of the heat conduction link, a portion of the link extending around the return portion being attached back onto itself.
An electric immersion heater comprising:
- a metal sheathed heating element formed to provide two end portions and an intermediate return portion adjacent the end portions;
- a heat conduction link of sheet material of high thermal conductivity attached at a first end to and extending substantially completely around the return portion of the element in good thermal contact therewith, a second end of the heat conduction link and the end portions of the element being arranged so that in use they are adapted to extend through sealing means disposed in at least one opening in a wall of a liquid heating chamber such that, from outside the chamber, electrical connections can be made to the end portions of the element and thermally-responsive control means can be associated with the second end of the heat conduction link, a portion of the link extending around the return portion being attached back onto itself;
- and
- a plastic head member for mounting the heater in an opening in a wall of a water heating chamber, the end portions of the element and the link extending through sealing means in the head member, the link being folded to lie generally parallel to a back of the head.
An electric heating appliance comprising:
- a heating chamber having an opening in a wall thereof;
- and
- an immersion heater secured in the opening, the immersion heater including a metal sheathed heating element formed to provide two end portions and an intermediate return portion adjacent the end portions, and a heat conduction link of sheet material of high thermal conductivity attached at a first end to and extending substantially completely around the return portion of the element in good thermal contact therewith;
- sealing means arranged to seal the opening, the heat conduction link and the end portions of the element extending through the sealing means;
- and
- a thermally responsive control associated with the heat conduction link on a dry side of the sealing means.
Dependencies are inferred from the claim text.