CHEVROLET AUTOMOBILE BIMETAL COIL FOR COOLING SYSTEM
Themostatic bimetal types:
The type of thermostatic bimetal depends on the application and the available space. Elements can be roughly classified into four main groups:
Beams,
Coils,
Disks,
Formed elements.
Beams develop nearly linear motion. Coils (spiral,helical and double helix coils) Disks move linearly or discontinuously (snap-action).
Formed elements include a wide range of regular or irregular shapes. The U shape is very widespread. This type of element is employed when the available space will not permit the use of long, flat beams.
Generally speaking, coils are used wherever extensive motion is required, while beams are required for smaller movements to trip operating mechanisms.
Thermostat bimetal functions:
The effects of thermostatic bi-metal curvature in response to a change in temperature are utilized in practical applications to achieve different aims. These can essentially be described by the following functions : measuring, limiting,controlling,compensation,pulse-generation,retardation.
All these functions overlap to a certain extent so that a particular application may fall under several categories .
Measuring:
Temperatures and certain electrical variables and their rate of change can be regulated by calibrated systems. Examples:Spiral thermometers, Ammeters
Limiting:
Trip functions are required at certain upper or lower limits in order to initiate or to cut out an operation. Examples :Automatic circuit breakers,Motor protection switches
Controlling:
Within a certain range,functions are cut in or out ,or circuits made or broken,in order to maintain a certain average setting. Examples:Electric iron controls, Bypass valves
Compensation:
A deviation from the initial condition is compensated for by the thermostatic bimetal action.
Examples :Color television tube compensation,Measuring instruments with compensation for fluctuations in ambient temperature
Pulse-generation:
An operation is triggered at clocked intervals. Examples:Flasher relays, Hotplate heating coils
Retardation:
An incoming signal (e.g. current)will only trigger an operation after a defined delay period.
Example:Thermal relay
Package:
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