Vehicle heating system and bypass therefor

Heating systems – Heat and power plants – Vehicle

Patent

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Details

137117, B60H 102

Patent

active

053222172

ABSTRACT:
A heater circuit in a vehicle engine cooling and passenger compartment heating system comprises a control valve (26), and a supply line (22) and a return line (24) both of which are separate from the radiator circuit of the system. A bypass passageway (48) extends between the supply line (22) upstream of the valve (26) and the return line (24) downstream of the valve (26). A bypass valve normally closes the passageway (48) and opens in response to a pressure differential between the supply line (22) and return line (24) exceeding a predetermined magnitude. The passageway (48) has first and second detachably connected portions that communicate with the supply and return lines (22, 24) via radial openings (44, 46). A spring (72) abuts a shoulder (54) in the second portion and a valve element (62) that seats against a flat surface surrounding the radial opening (44) in the supply line (22). The element (62) has laterally extending guide teeth (68) and a rear reduced diameter lug (70) engaged by the spring (72). The bypass valve limits strain on the control valve, makes manual operation of the control valve easier, and enhances the consistency of control of the outlet temperature of the heater.

REFERENCES:
patent: 2087613 (1937-07-01), Bordeaux
patent: 2345140 (1944-03-01), McCollum et al.
patent: 3302696 (1967-02-01), Rogers
patent: 3727879 (1973-04-01), Lange et al.
patent: 3966119 (1976-06-01), Harter et al.
patent: 3966164 (1960-12-01), Britton
patent: 3981279 (1976-09-01), Bubniak et al.
patent: 4373666 (1983-02-01), Williams
patent: 4391407 (1983-07-01), Nakazawa
patent: 4865249 (1989-09-01), Sugano et al.
patent: 5048752 (1991-09-01), Hintennach et al.

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