Ceramic heater for heating water in an appliance

Patent metadata

Field	Value
Publication number	US-11828490-B2
Application number	US-202117236427-A
Country	US
Kind code	B2
Filing date	Apr 21, 2021
Priority date	Apr 24, 2020
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

An appliance for heating fluid includes a reservoir for holding the fluid during use. One or more ceramic heaters mount with the reservoir to heat the fluid. The heater includes electrically resistive traces thick-film printed on a substrate. The heaters optionally mount with a heat transfer element having a relatively large surface area. The heat transfer element typifies a conductive element, such as an aluminum plate of forged aluminum. The plate has cavities to retain the heaters or sections fitted about heaters. Holes through a thickness of the plate induce turbulent fluid flow as the fluid freely passes there through during use. Heater control and mounting are still other aspects of the technology.

First claim

The invention claimed is:

1. An appliance for heating water, comprising:
a reservoir for holding the water;
a forged aluminum plate for contacting the water on a side thereof;
two ceramic heaters mounted to the forged aluminum plate on an opposite side thereof, each of the ceramic heaters having one or more thick-film printed electrically resistive traces on a substrate that heat upon activation, the traces providing heat to a surface area of said each of the ceramic heaters that transfers to the opposite side of the aluminum plate;
a plurality of holes through a thickness of the forged aluminum plate allowing the water to pass through the thickness during use, the two ceramic heaters being rectangular in surface area and the plurality of holes extend lengthwise in three arrays on either longitudinal sides of the rectangular surface area; and
an insulator on a side of the two ceramic heaters opposite said opposite side thereof, the insulator having a number of holes in arrays matching a number of the plurality of holes through the thickness of the forged aluminum plate.

2. The appliance of claim 1 , further including a graphite film between said each of the two ceramic heaters and the forged aluminum plate.

3. The appliance of claim 1 , wherein each of the three arrays has five holes.

4. The appliance of claim 1 , further including wherein the aluminum plate has a cavity for retaining therein the two ceramic heaters.

5. The appliance of claim 1 , further including two spring clips to retain said each of the two ceramic heaters.

Assignees

• Lexmark Int Inc

Inventors

• Smith Jerry Wayne
• Schneider David Anthony
• Cao Jichang
• Johnson Jr Virgil

Classifications

• F24H1/103 Primary

  with bare resistances in direct contact with the fluid · CPC title

• H05B3/16

  the conductor being mounted on an insulating base · CPC title

• H05B3/82

  Fixedly-mounted immersion heaters · CPC title

• H05B2203/013

  Heaters using resistive films or coatings · CPC title

• H05B2203/021

  Heaters specially adapted for heating liquids · CPC title