Device for controlling the formation of frost on cooling radiators and the defrosting of the same
AssigneeUPO Oskeyhtio
InventorsPaavo Kinnunen, Viljo Lukkarinen
Life of this patent
Estimating the term…
Abstract
A device to be used e.g. in cooling radiators, for monitoring the formation of frost and for defrosting. Frost formed on the cooling radiator causes a change in the quantity of light received by a light receiver from a light transmitter, and when the quantity of light received by said light receiver reaches a predetermined value a unit controlled by the light receiver initiates the drfrosting which continues until all of the frost has molten.
Claims8
A device for controlling the formation of frost on cooling radiators and the defrosting of the same, which device receives its operating voltage from a network component and has a relay for connecting power either to a cooling machinery or to a melting resistance, comprising
- a solid state light transmitter the light of which is at least partly directed at the supposed place of frost formation,
- an oscillator connected to receive its operating voltage from said network component and to feed pulses of current to said light transmitter, whereby the light thereof is in the form of light pulses,
- a light receiver,
- a memory unit which is controlled by said light receiver and which controls the switching of power to either said cooling machinery or said melting resistance, and
- means for stopping of the defrosting and connected to said memory unit,
- said light transmitter and said light receiver being arranged in such a way that frost formed on the cooling radiator causes a change in the quantity of light received by the light receiver from the light transmitter said change being transferred to the memory unit controlling the power which unit initiates the defrosting which goes on until said stopping means, having found that all the frost has melted, restores the memory unit to the rest position.
Dependencies are inferred from the claim text.