Showing papers on "Damper published in 1978"

Magnetic viscous damper

Abstract: Disclosed herein is a rotary viscous damper using a magnetic fluid as the damping medium. The damper comprises a permanent magnet rotor enclosed in a magnetically permeable housing. The magnetic fluid fills the space between the rotor and the housing and is held in place using magnetic forces generated by the magnet rotor. The torque of damper may be varied by changing the viscosity of the magnetic fluid or the level of the magnetic flux in the magnetic circuit.

Bearing assembly with multiple squeeze film damper apparatus

Abstract: An improved bearing assembly is provided for supporting a rotating shaft. The improvement is comprised of utilizing a resilient support means in combination with a multiple squeeze film damper apparatus. The damper apparatus provides a large damping force to suppress large vibrations and excessive radial shaft deflections in the event of operation with an abnormally high unbalanced shaft. The resilient support provides a soft spring system as a means for establishing and maintaining the critical rotor speed at a low speed condition, for centering the shaft during normal operation, and for allowing radial deflection during operation with an unbalanced shaft.

Torsional vibration damper for a lock-up clutch

Abstract: A torsional vibration damper for a torque converter lock-up clutch having viscous and spring-damping characteristics during the initial relative movement between the input and output members of the clutch and a spring-damping characteristic during further relative movement. Viscous damping can also be provided during the further relative movement, if desired.

Method and apparatus for ventilating an occupied space

Abstract: Method and apparatus for controlling the amount of outside air introduced into a given space being ventilated as a function of the oxygen content of the air in the space to minimize the energy expended in heating or cooling air flowing through the space while maintaining the oxygen content of the air above that required for the well-being of humans occupying said space. A fuel cell produces an electric current the magnitude of which is a function of the partial pressure of the oxygen present in the air surrounding the fuel cell. The output of the fuel cell is applied to a control circuit which applies control signals to the motor control circuit of a damper motor to admit outside air when the partial pressure of the oxygen in the occupied space falls to a predetermined minimum level and to exclude outside air and to recirculate return air when the partial pressure of the oxygen in the space rises to a certain maximum level.

Automobile auxiliary heater

Abstract: To supply heat to the passenger compartment of an automobile car body immediately upon entering it, an approximately triangular housing has two branch outlet ducts converging from the opposite ends of a main inlet cross duct including a fan chamber containing a reversible electric fan This fan initially draws cold air into the fan chamber of the main inlet cross duct and forces it through an electric heating coil and then through one of the two converging branch outlet ducts to a common outlet containing a freely pivoted damper which in response to the pressure of the forced air swings to cut off air flow from the other converging branch outlet duct and at the same time directs the heated air through a horizontal transverse duct into the passenger compartment When the compartment has been thus heated preliminarily, the operator de-energizes the electric heating coil and reverses the fan, causing it to direct outside air through the conventional engine radiator-connected liquid heater of the automobile and then through the opposite converging branch outlet duct Thereupon the thus-forced air causes the damper to swing to an opposite position, closing the first converging branch outlet duct and thenceforth supplying air heated by the conventional heater to the passenger compartment Electricity for the electric heating coil is provided by the car alternator and/or storage battery

Automatic energy saver and fire damper for exhaust systems

Abstract: Exhaust system control apparatus operative to automatically close a damper in an exhaust duct leading from a spray booth when the spray booth is not in operation. A reversible damper motor is energized to rotate the damper to an open position when the spray booth is in operation. The damper motor is automatically reversed to close the damper in response to termination of spray booth operation. Energy is thus conserved by reducing the amount of heated air that would otherwise escape through the exhaust duct when the spray booth is not being used. In case of fire, the same damper is automatically rotated to a closed position in the exhaust duct by a spring loaded sprocket assembly on the damper shaft. This safety action takes place in response to the melting of a fusible link located in the exhaust duct and connected to a sprocket retention cable.

Air conditioning display system for vehicles

Abstract: An air conditioning display system for a vehicle comprising a vehicle's air conditioner proper including a plurality of air intake ducts, a plurality of air discharge ducts, a plurality of dampers, and a fan unit, an air conditioner actuator actuating the dampers and the fan unit thereby regulating a temperature of air discharged out of the discharge duct, and a display device including a display panel carrying the picture of the vehicle body portions including the front seat, front glass and bonnet for displaying the flowing patterns of air into and out of the air conditioner proper. Lamps emitting light of warm color and cold color are disposed behind the display panel and are selectively energized by a plurality of switch means so that the occupant can readily visually confirm the flow of warm air or cold air from the duct outlets and also the flowing directions of air.

Attitude control for car suspension - incorporates displacement monitors on dampers and inertial sensors linked to central control

Abstract: An attitude control for a car suspension in which the relative pressures and rates of displacement of the suspension dampers is monitored by a central control and compared with inertial sensors. The control provides correction signals for the height adjusting valves so that the vehicle tilts into curves for improved comfort and road holding. The control provides a fast response as well as a height control for the suspension. The response is fast enough to follow changes in steering setting.

Vibration damper assembly

Abstract: A vibration damper assembly providing for extended travel in the damper operation, wherein the assembly includes a hub having an integral radial flange and three circumferentially equally spaced radially extending hub arms, a pair of equalizers journalled on the hub on opposite sides of the flange, and a housing substantially enclosing the hub and equalizers and adapted to be secured to a torque input member. Each equalizer has three circumferentially equally spaced radially extending arms, with the arms of the two equalizers alternating between the hub arms. This assembly provides for three groups of damper springs acting in parallel with three spring sets acting in series in each group.

Fluid flow controller

Abstract: A fluid flow controller is disclosed particularly adapted for maintaining a variable value constant volume fluid flow through a conduit supplying fluid to a zone. A spring biased vane is disposed across the diameter of the conduit to provide a motion signal proportional to the average volume flow pressure across the diameter of the conduit. The motion signal from the vane and a transducer within a zone to which the fluid is being conducted responsive to an environmental parameter in the zone are connected to a controller assembly connected to control an actuator moving a damper within the conduit. The controller is adapted to position the damper to maintain the motion signal from the vane and the signal from the transducer within the controlled zone in balance. This is a continuation-in-part of application Ser. No. 711,066 filed Aug. 2, 1976, now abandoned.

Mechanical-hydraulic damper for a load subject to shocks and vibrations

Abstract: A mechanical-hydraulic damper for a load which is subject to shocks and vibrations, comprising a co-operating pair of elements, the first of the pair of elements being mounted in a body for relative axial movement in relation to the body and the second of the pair of elements being rotatably mounted in the body and so coupled to the first element that relative axial movement of the first element causes rotation of the second element which is coupled to a hydraulic system which resists sudden or rapid rotation of the second element. The pair of co-operating elements may comprise a screw-nut assembly. The hydraulic system may comprise a reversible pump driven by the rotatable element and pumping hydraulic fluid round a closed circuit including a throttling orifice. Alternatively the hydraulic system may comprise a rotary laminar hydraulic damper filled with high viscosity oil.

Independent biasing means for automatic flue damper

Abstract: For a vent or flue damper of the type in which the damper is closed by an electrically energized actuator when the furnace is off and the actuator has first biasing means to open the damper when the actuator is deenergized, a second biasing means such as a torsion spring, independent of the first biasing means, is associated directly with the damper shaft and is adapted to always move the damper to an open position in the absence of the actuator.

Solar heat air system

Abstract: There is disclosed herein a forced air solar heating system which causes selectively operated multiple air blowers in combination with multiple ducts and control dampers to operate in response to heat sensors in the space to be heated, and in a solar collector, and in a storage chamber, to transfer heat from the collector to storage, or to controllably transfer heat to said space from the collector or from the storage, but also alternatively as mixed heated air from both the collector and the storage, to a mixing chamber and then to said space The air propelling blowers, the flow control dampers, and the mixing chamber are preferably all part of a unitary air handler

Multizone air terminal

Abstract: The invention provides an air terminal capable of serving multiple zones with either variable volume, constant temperature air or variable temperature, constant volume air, or both, without any reheating of cold air. The terminal consists of a cold air plenum and a return air plenum. The cold air plenum is served with cold air from a primary cold duct. The air is introduced into this plenum through a damper which is controlled by a regulator for maintaining a constant pressure in the cold air plenum. The return air plenum is supplied with return air by a constant pressure recirculating fan mounted in the terminal. Constant volume, variable temperature air is supplied to the zones through thermostatically controlled mixing dampers which mix air from the cold plenum with air from the return plenum. A heating unit downstream from the mixing dampers selectively raises the temperature of the air provided to a zone. The heating is controlled in sequence with the mixing operation so that only return air can be heated. Constant temperature variable volume air supply is provided from the central terminal to serve zones that neither require heat or zones with controlled heat available from another source. In another embodiment, a hot air plenum is installed in fluid communication with the air in the return air plenum. A mixing damper mixes return air and hot air when the cold air dampers are completely closed off to provide heating to a particular zone.

Multiple stage vibration damper assembly

Abstract: A multiple stage damper for the driven member of a vehicle clutch which eliminates objectionable vibration during both engine idle and while the vehicle is in motion. The damper comprises inner and outer hubs with springs therebetween and additional damper springs between the outer hub and the clutch and spring retainer plates to provide two or more damping stages. A two stage damper results when the springs connecting the inner and outer hubs work simultaneously, while a three stage damper results when a first spring or springs are actuated prior to a second spring or springs providing a sequential damping action.

Automatic vent damper

Abstract: An automatic vent damper for combustion devices such as furnaces which closes the combustion chamber exhaust vent when the furnace burner is off to conserve heat and prevent backdrafts. A damper blade pivotally mounted in the exhaust vent is closed by an electrically-operated damper motor operating against a torsional spring urging the damper plate into the open position, the damper motor being energized whenever burner operation is not in demand by the automatic controls. When the controls call for burner operation, the motor is deenergized and the damper blade moves to the open position under the influence of the torsional spring. A limit switch senses the damper blade achieving the open position and enables burner operation. An electrically conductive, thermally fusible link is positioned within the vent in series with the power supply for the control circuit powering the damper motor and burner controls so that in the event a failure results in burner operation with the damper blade closed, the fusible link melts and thereby deenergizes the damper motor and burner controls allowing the torsional spring to move the damper blade to the open position. The damper blade and actuator components are mounted on a cast iron housing mating with the vent ducts to prevent corrosion or temperature-induced distortions from jamming the damper blade, providing reliable operation over extended periods. A solid state relay or delay switching device is alternatively utilized to control energization of the damper motor to insure reliable operation.

Damper construction for a gas fired combustion apparatus

Abstract: A thermally controlled damper construction for a gas fired combustion apparatus, such as a furnace. The damper has a generally eliptical shape and is mounted on a shaft in the stack or flue for pivotal movement from a closed position, where the damper is located at an angle of approximately 45° with respect to the axis of the stack, to a full open position. One edge of the damper is recessed to provide a vent opening between the damper and the stack and permit venting of gases generated by operation of the pilot light during periods when the furnace is not operating. The damper is moved between the closed and open positions by a bi-metallic element which is located upstream of the damper and connected to the damper by a linkage. When the furnace is operated, the increase in flue temperature will operate the bi-metallic element to move the damper to the open position. A temperature responsive safety switch is located upstream of the damper adjacent the vent opening and is operably connected to the gas supply of the furnace. In the event the damper does not open when the furnace is operated, the safety switch will shut off the gas supply to the furnace.

Control for a power plant coal mill pulverizer having feedforward damper positioning

Abstract: Power plant boiler fuel demand is transmitted as a coal feeder speed demand to a coal pulverizer control. A speed controller operates the feeder in accordance with the speed demand, and a position controller for a hot coal transport air damper positions the hot air damper to hold the mill outlet temperature to a setpoint value and to increase or decrease damper position in accordance with a feedforward signal representing the feeding speed demand. A position controller for a cold air damper regulates the total primary air flow to a value needed for safe and smooth transport of the pulverized coal to the boiler burners, and it accordingly acts as a process trim on the feedforward control applied by the hot damper controller.

Thermal damper assembly having position controls

Abstract: A thermal damper assembly mounted to substantially close a flue at room temperature is equipped with thermally responsive coils to move the damper to an open position in response to heat generated by combustion. To allow commencement of combustion the damper assembly is equipped with latch means to position the damper open in preparation for combustion, said latch means responding automatically to an adequate advance of said damper toward its fully open position to disable its own latching capability whereby said coils are permitted to substantially fully close the damper assembly without further attention to the latch means, which serves only to releasably position the damper assembly for commencement of combustion. Also illustrated in this application are various position control members for predetermining fully open and substantially fully closed damper positions. Also illustrated in this application are inboard and outboard mountings for the thermally responsive coils.

Safety damper for vehicle trailer articulated coupling - has damper blocked when flow exceeds set valve due to jack-knifing

Abstract: The telescopic damper is fitted with a series of ring shaped valve ducts to allow a controlled flow of fluid past the piston. If the flow exceeds a set rate then the valves shut and secure the damper setting. The critical flow rate causes the ring shaped ducts to be blocked by spring loaded reaction plates. The damper is a higher performance type which is set on articulated couplings to stabilise the trailer setting when the vehicle starts to jacknife.

Induction heating device

Abstract: PURPOSE:To prevent an output element from destroying in case a work to be heated is inadequate in a state of preparation, by feeding a low voltage in an output circuit and detecting a damper current of the circuit.

Non-linear spring rate clutch damper

Abstract: A torsional vibration damper assembly for the transmission of power in a torsional coupling or automotive vehicle clutch wherein the coil springs normally disposed between the driving and driven plates of the assembly are replaced by one or more bowed leaf springs to provide a non-linear elastic system.

Method and apparatus for reducing torque on an air damper

Abstract: A volume air flow controller having a butterfly damper mounted within an air duct and movable between open and closed positions employs a baffle, located upstream from the damper, as an air flow impedance to change the flow conditions upstream from the damper so as to reduce the normal damper closing torque resulting from aerodynamic forces produced by air flow past the damper.

Automatic damper means and controls therefor

Abstract: An automatic damper means and controls, which provide an exceedingly safe automatic damper for the exhaust duct-work of an associated gas furnace or the like, by automatic control of the damper, and automatic control of the gas supply, with redundancy features for providing exceedingly safe operation.

Automatic flue damper

Abstract: A relatively simple automatic mechanical flue damper is provided by a damper plate having a slot extending across a major portion of its diameter with a helically-shaped, temperature responsive bimetal having one end attached to the damper plate at one end of the slot, and its other end attached to a bushing which in turn is fixed relative to the flue in which the damper is situate, with a shaft extending in rotatable relation through a bore in the bushing and having its end opposite the bushing attached to the damper plate, the helical bimetal being responsive to changes in flue gas temperature to rotate the damper plate between predetermined open and closed positions with the shaft rotating to corresponding positions, and at least one of the shaft ends including indicia means to permit observation of shaft and damper rotative position. The arrangement adapts itself to the provision of electrical means responsive to the shaft rotation to shut down the furnace operation in response to failure of the damper plate to move the open position within a predetermined time after initiation of the furnace operation.