Hermetically sealed, relatively low pressure cooling system for internal combustion engines and method therefor

Patent · Tue Nov 29 00:00:00 EST 1988

OSTI ID:6422965

Howcroft, D E

This patent describes a hermetically sealed, relatively low pressure cooling system for internal combustion engines including a thermostat which opens at a predetermined engine operating temperature, comprising: a hermetically sealed radiator having a filling neck located in the top portion of the radiator, a nonpressurized cap in sealed relationship with the filling neck; a small expansion reservoir for liquid coolant integral with and connected in hermetically sealed relationship with the top portion of the radiator forming a composite structure thereby, the reservoir having coolant inlet means which projects downwardly into the radiator so that coolant will reside in the lower portion of the expansion chamber when the radiator is filled with coolant and having a closed dead air space in the upper portion of the expansion reservoir wherein liquid coolant due to engine heating during operation expands and flows freely from the radiator upwardly and into the expansion reservoir causing a relatively low pressure to be built up in the dead air space behind the coolant and subsequently returning from the reservoir into the radiator under the influence of the relatively low pressure in the closed dead air space to maintain the cooling system full at a full level at all times, whereby pressure in the hermetically sealed cooling system is maintained at a relatively low value compared to conventional high pressure systems which operate at or near 15 psi, the low pressure causing the boiling point of the coolant to remain at a relatively low value, permitting the thermostat of the engine to thereby control engine temperature over substantially the full range of engine operation and thus causing the engine to operate at a temperature at or in relatively close proximity to the predetermined temperature of the thermostat.

• Assignee: Susan E. Lund, Baldwin, ND
• Patent Number(s): US 4787445
• OSTI ID: 6422965
• Resource Relation: Patent File Date: Filed date 23 Feb 1988
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
COOLING SYSTEMS
DESIGN
INTERNAL COMBUSTION ENGINES
ACCUMULATORS
COOLANTS
OPERATION
RADIATORS
SEALS
TEMPERATURE CONTROL
TEMPERATURE DEPENDENCE
THERMOSTATS
CONTAINERS
CONTROL
CONTROL EQUIPMENT
ENERGY SYSTEMS
ENGINES
EQUIPMENT
HEAT ENGINES
HEAT EXCHANGERS
TANKS
330100* - Internal Combustion Engines