초록 ▼

A flow-through instantaneous electric water heater for coffee percolators has a metal casting with a substantially flat bottom portion formed with a U-shaped trough receiving therein a U-shaped electric heating element. A semi-annular boiling water chamber is formed in the casting between the arms o

A flow-through instantaneous electric water heater for coffee percolators has a metal casting with a substantially flat bottom portion formed with a U-shaped trough receiving therein a U-shaped electric heating element. A semi-annular boiling water chamber is formed in the casting between the arms of the U-shaped heating element adjacent the base region of the U and has an inlet and an outlet opening connected, respectively, to water inflow and outflow conduits located adjacent the legs of the heating element. The water inflow conduit has a length at least 1.3 times the length of the average flow path of water flowing through the boiling water chamber or about twice the diameter of the boiling water chamber and is thermally insulated over a major portion of its length from the adjacent heating element leg by an air gap to insure that the temperature of the fresh water flowing into the chamber from the inlet conduit is below the boiling temperature. The thickness of the casting increases toward the base of the U at an inclination angle between 1.5°and 4°.

대표청구항 ▼

A flow-through heater for coffee percolators, consisting of a metal casting having a substantially flat bottom portion the border portions of which are formed with a receiving trough of U-shaped cross-section for receiving therein a substantially U-shaped electric heater element, and a boiling water

A flow-through heater for coffee percolators, consisting of a metal casting having a substantially flat bottom portion the border portions of which are formed with a receiving trough of U-shaped cross-section for receiving therein a substantially U-shaped electric heater element, and a boiling water chamber formed adjacent the foot of the U-shape of the heater element, water inflow and outflow conduits located adjacent the U-legs of said heater element opening into said boiling water chamber, said water inflow conduit being provided with heat insulation over the major portion of its length against the adjacent end of the heater element, characterized that said water inflow conduit is of a length amounting to at least 1.3 times the length of the average flow path of the water flowing through said boiling water chamber.