Coolant heater

A coolant heater comprising:

• a heating element for heating a coolant;
• a first housing for accommodating the heating element;
• a cover plate for sealing the first housing in which the heating element is accommodated;
• a temperature fuse provided in an external space formed by coupling the first housing and the cover plate, and disposed to be adjacent to the cover plate;
• a second housing for pressing the temperature fuse to be pressurized toward the cover plate;
• an elastic means interposed between the temperature fuse and the second housing, with a lower end thereof being supported by the temperature fuse and an upper end thereof being supported by the second housing, wherein the second housing includes a seating section protruding from a lower surface thereof, and the elastic means is inserted into an inner space of the seating section to be seated therein;
• and
• a push plate including:
• a support plate disposed between the temperature fuse and the elastic means, with an upper surface thereof being in contact with the elastic means and a lower surface thereof being in contact with the temperature fuse;
• and a first guide protruding upwardly from the support plate and fitted around an outer surface of the seating section.

A coolant heater comprising:

• a heating element for heating a coolant;
• a first housing for accommodating the heating element;
• a cover plate for sealing the first housing in which the heating element is accommodated;
• a temperature fuse provided in an external space formed by coupling the first housing and the cover plate, and disposed to be adjacent to the cover plate;
• a second housing for pressing the temperature fuse to be pressurized toward the cover plate;
• and
• a sealing member fitted around a peripheral portion of the cover plate to cover an entire edge of the cover plate, and formed to cover all three surfaces at the peripheral portion of the cover plate,
• wherein, in a state in which the sealing member is fitted around the peripheral portion of the cover plate, the peripheral portion of the cover plate including the sealing member is interposed between an upper end portion of the first housing and a lower end portion of the second housing to closely adhere thereto, and
• inner ends of the sealing member protrude inwardly further than inner wall surfaces of the first housing and the second housing to be coupled thereto.

A coolant heater comprising:

• a heating element for heating a coolant;
• a first housing for accommodating the heating element;
• a cover plate for sealing the first housing in which the heating element is accommodated;
• a temperature fuse provided in an external space formed by coupling the first housing and the cover plate, and disposed to be adjacent to the cover plate;
• a second housing for pressing the temperature fuse to be pressurized toward the cover plate;
• and
• a sealing member fitted around a peripheral portion of the cover plate to cover an entire edge of the cover plate, and formed to cover all three surfaces at the peripheral portion of the cover plate,
• wherein, in a state in which the sealing member is fitted around the peripheral portion of the cover plate, the peripheral portion of the cover plate including the sealing member is interposed between an upper end portion of the first housing and a lower end portion of the second housing to closely adhere thereto, and
• the sealing member includes a through hole penetrating through both surfaces thereof to enable communication between an inner space into which the cover plate is inserted and the outside.