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    • 9. 发明授权
    • Pressurized liquid cooling system for an internal combustion engine
    • 用于内燃机的加压液体冷却系统
    • US4167159A
    • 1979-09-11
    • US792211
    • 1977-04-29
    • Bruce L. Warman
    • Bruce L. Warman
    • F01P7/14F01P3/22F01P11/02F01P11/18
    • F01P3/2207F01P11/18
    • A liquid cooling system for an internal combustion engine includes a conventional radiator and circulating system and pressure cap, the latter having pressure and vacuum relief valve components for limiting the maximum operating pressure of the system and for limiting negative pressures to avoid damage during cooling after engine shutdown. A second, temperature responsive, pressure relief valve provides a lower system relief pressure as long as the temperature of the coolant in the radiator top tank remains below a certain level. When that level is exceeded, a thermally actuated valve excludes the second pressure relief valve from the system and maximum operating pressure is then limited, at a higher level by the valving of the pressure cap. In an alternative embodiment, an infinitely variable pressure relief valve responsive to and controlled by changes in coolant temperature replaces the fixed second pressure relief valve and its thermal actuator. As the temperature of the coolant increases, the set point of the variable pressure relief valve also increases and the system relief pressure varies automatically with the coolant temperature over a range of pressures whose upper limit is significantly greater than the set point of the relief valve in the pressure cap so that maximum system operating pressure is still limited by the pressure cap.
    • 用于内燃机的液体冷却系统包括常规的散热器和循环系统和压力盖,后者具有压力和真空释放阀部件,用于限制系统的最大工作压力并限制负压以避免发动机冷却时的损坏 关掉。 第二个温度敏感的压力释放阀提供较低的系统释放压力,只要散热器顶部罐中的冷却剂的温度保持在一定水平以下即可。 当超过该级别时,热致动阀不包括系统中的第二压力释放阀,并且然后通过压力盖的阀门在较高的水平限制最大工作压力。 在替代实施例中,响应于并且由冷却剂温度变化控制的无级可变减压阀代替固定的第二减压阀及其热致动器。 随着冷却剂温度的升高,可变压力释放阀的设定值也会增加,并且系统溢流压力随冷却液温度自动变化,压力范围在上限远大于溢流阀的设定值 压力盖使得最大系统工作压力仍然受到压力盖的限制。