Abstract: A cooling fan controller is provided for controlling the revolving speed of a cooling fan that introduces outside air as a cooling wind to cool a fluid being cooled; in order to optimally control the revolving speed if the cooling fan in accordance with load, and to suppress noise caused by the cooling fan. The cooling fan controller includes a fluid temperature sensor 40 for sensing a temperature To of the fluid, an air temperature sensor 30 for sensing a temperature Ta of the air, and a control 20 for calculating a difference between the fluid temperature To sensed by the fluid temperature sensor 40 and the air temperature Ta sensed by the air temperature sensor 30, and setting a target revolving speed Nf of the cooling fan in accordance with a magnitude of the calculated difference.
Abstract: A flow regulating article is provided. The flow regulating article, in an exemplary embodiment, includes a patterned structure. The patterned structure includes a shape memory alloy capable of changing shape at predetermined temperatures.
Abstract: A thermally responsive power device is disclosed employing a thermally sensitive unit in which are housed multiple vapor/gas filled capsules which expand and contract in response to temperature changes. The thermally responsive element is connected in a closed system through a conduit or tube to a remote diaphragm power or motion producing unit, and a temperature stable hydraulic fluid filling the space with the system moves the diaphragm in accordance with the expansions and contractions of the capsules. Several different embodiments for the capsules and their housings are shown, and all embodiments contemplate selective use of capsules with different vapor/gas fills to tailor the completed thermally sensitive elements to provide substantially equal temperature sensitivity in two or more regions of their working temperature range.
Abstract: A hydraulic system which is monitored to control the application of fluid power in response to the temperature of the hydraulic fluid and a temperature responsive valve for use in the hydraulic fluid circuit to monitor the temperature of the fluid to control the application of fluid power to components of the system.
May 13, 1977
Date of Patent:
November 28, 1978
Fiat-Allis Macchine Movimento Terra, S.p.A
Abstract: A safety control method for limiting the temperature of a fluid to a given upper value comprising the sensing of the fluid temperature and the control of a servo-motor keyed in follow-up relationship to said temperature and acting upon a member controlling a parameter conditioning said temperature, wherein the improvement consists in the steps of effecting the detection so as to cause the displacement of a movable element through the expansion of a liquid heated up to a temperature varying in the same direction as the sensed temperature and transmitting said displacement through a hydraulic circuit relay to a hydraulic ram actuator forming said servo-motor.
Abstract: A thermally responsive freeze type actuator for operating an air conditioning throttle valve. The actuator includes a rigid walled tubular portion which contains water and is attached to an axially extendable and contractible bellows portion. The bellows portion contains an immiscible fluid such as oil which floats on the water. The pressure forces created by the formation of ice in the tubular portion is transmitted to the oil by compression of one end of a hollow bladder member made of flexible material such as rubber which extends axially through the tubular portion and the bellows portion.
Abstract: An improved thermally responsive freeze actuator for operation of an air conditioning throttle valve between the evaporator and compressor to maintain the pressure and temperature of evaporator refrigerant above a freezing level. The improved actuator includes a rigid-walled tubular portion containing water and an attached axially extendable bellows portion. The water in the tubular portion is separated from the bellows portion by a deep cup shaped member or diaphragm of elastomeric material. The deep pocket of the diaphragm encloses one end of a push rod. As the water surrounding the pocket portion of the diaphragm changes to ice the rod is moved axially from the tubular portion. The other end of the rod engages the bellows which may be stationary mounted to a frame member to cause the entire actuator to move with respect to a valve seat.