Patent ID: 6045444
Filing Date: 2000-04-04
Classification: B60H

Abstract:
An automotive heating, ventilation and air conditioning housing (30) that is generally divided into upper (B) and lower (A) upstream quadrants and upper (D) and lower (C) downstream quadrants as defined by the space envelope occupied by a larger, upstream evaporator (56) and a smaller, downstream heater (58) contained within said housing (30), with the evaporator (56) located across both upstream quadrants (A, B) and the heater (58) located substantially within just the lower downstream quadrant (C) with a first heater face oriented generally toward the upper downstream quadrant (D) and an opposed second heater face, characterised by,a temperature valve having a movable belt (74) arrayed with substantially equal length upstream and downstream legs, and oriented with the upstream leg dividing the upstream (A,B) and downstream (C,D) quadrants and with the downstream leg covering the first face of said heater (58), said belt (74) having an opening therein substantially equal in length to one belt leg length and movable back and forth between the two legs so as to selectively block or unblock air flow through said evaporator (56) while concurrently unblocking or blocking air flow through said heater (58) in inverse proportion, and,an air flow diversion passage (100) running from the bottom of the upstream lower quadrant (A) to the heater second face so as to divert a portion of the air that has passed through the evaporator (56) and direct the air so diverted in a reverse flow through the heater (58) and into the upper downstream quadrant (D), said air being diverted only to the extent that the evaporator (56) is blocked and the heater upper face is correspondingly unblocked by the position of the opening in the temperature valve belt (74),whereby air that has passed through the evaporator (56) and any diverted air that has passed through the heater (58) are both ultimately directed into the upper downstream quadrant (D) to be mixed.