High heat dissipation PTC heater structure

• US 5,028,763 A
• Filed: 07/11/1989
• Issued: 07/02/1991
• Est. Priority Date: 07/11/1989
• Status: Expired due to Fees

• Current Assignee: Chang Chung-Tai
• Original Assignee: Chang Chung-Tai
• Inventors: Chung-Tai, Chang
• Primary Examiner(s): Bartis, Anthony
• Application Number:
  US07/378,949
• Time in Patent Office: 721 Days
• Field of Search: 319/375, 319/381, 319/382, 319/307, 319/205-207, 319/365, 319/541, 319/540, 319/530, 319/504, 319/505, 338/22 R, 338/53, 123/549, 123/557, 392/347, 392/379
• US Class Current: 219/530
• CPC Class Codes: H05B 3/14 the material being non-metallic
• CPC Class Codes: H05B 3/30 on or between metallic plates

Abstract

A pair of plates of good heat and electric conductivity have a plurality of openings and a plurality of foraminous areas. The plates are secured to one another with the openings and foraminous areas of the two plates aligned with one another. The plates are connected to terminals of opposite electrical polarity and are insulated from one another. A plurality of perforated PTC thermistor elements are clamped between the plates and in electrical contact therewith. Each element is aligned with openings in the plates. The openings and foraminous areas are so disposed that the openings associated with the elements are surrounded on at least two sides by foraminous areas.

Claims

1. A PTC heater comprising a pair of square heat radiating plates each provided with a plurality of square openings and square foraminous areas regularly arranged such that each opening is surrounded on at least two sides by adjacent foraminous areas, a plurality of square perforated PTC thermistor elements corresponding in number to the number of said openings, said square plates being made of good heat and electric conductivity material and being insulated from one another, said plates being disposed in face-to-face relationship with one another, means securing said plates in position with said thermistor elements clamped between said plates with said elements being in electrical contact with the plates, the openings and the foraminous areas of the two plates being in alignment with each other, the openings and foraminous areas being located alternately in vertical and horizontal rows, said PTC thermistor elements being disposed between said plates with each element being aligned with respective ones of the openings so that air flow through the openings can flow through the perforated PTC thermistor elements, such that heat is conducted from said thermistor elements directly to air flowing therethrough and also is conducted to each of said foraminous areas for further conducting heat to air flowing through said foraminous areas thereby effectively radiating heat from said PTC thermistor elements to surrounding air.

2. A PTC heater comprising a pair of heat radiating plates, each provided with a plurality of openings and a plurality of foraminous areas, said plates being made of good heat and electric conductivity material and being insulated from each other, means for securing such plates in face to face relationship with said openings and said foraminous areas of the two plates being in alignment with each other, a plurality of perforated PTC thermistor elements, each element being in alignment with one of said openings and being clamped between said plates such that air can flow through said perforated PTC thermistor elements and said foraminous areas, said elements being in electrical contact with said plates, said openings and foraminous areas being disposed such that openings associated with said elements are surrounded on at least two sides by foraminous areas such that heat is conducted from said thermistor elements directly to air flowing therethrough and also is conducted to each of said foraminous areas for further conducting heat to air flowing through said foraminous areas so as to effectively radiate heat from said PTC thermistor elements to surrounding air.