Patent ID: 8946599
Filing Date: 2015-02-03
Classification: B60H,F24H,H05B

Abstract:
1. Electric heating device comprising: a housing, in which an imperforated separating wall is formed that divides the housing into a heating chamber and a circulation chamber which are fluidically separated from one another by the separating wall, wherein a liquid is held in and flows through the circulation chamber, wherein a portion of the separating wall protrudes into the circulation chamber and forms at least one U-shaped recess having a closed end and an open end, wherein the U-shaped recess is fluidically isolated from the circulation chamber, wherein the open end of the U-shaped recess is open to the heating chamber, wherein the liquid flows around opposed sides of said portion of the separating wall; an inlet opening, formed in the circulation chamber, for feeding the liquid into the circulation chamber and an outlet opening, formed in the circulation chamber, for guiding the liquid out of the circulation chamber, wherein said U-shaped recess provides opposing side pieces that are at least partially conically shaped, and wherein an electric heating element comprising at least one positive thermal coefficient heating element is held in the U-shaped recess; a printed circuit board which is provided in the heating chamber and to which the at least one positive thermal coefficient heating element is connected; wherein a pressure element is arranged between one of the side pieces of the U-shaped recess and the electric heating element, which pressure element lies flat against the electric heating element and the side piece, wherein the electric heating element further comprises two electrically insulating plates arranged parallel to one another, and wherein the at least one positive thermal coefficient heating element is arranged between the electrically insulating plates and two contact plates, which lie against both sides of the at least one positive thermal coefficient heating element and which are arranged between the at least one positive thermal coefficient heating element and the two electrically insulating plates, and wherein the contact plates each have diagonally opposing extension sections that project beyond an upper end of the electrically insulating plates, wherein a size of a surface area of the contact plates arranged between the insulating plates corresponds to the outer surface of the at least one positive thermal coefficient heating element facing the interior side of the insulating plate in each case.