OVERHEATING INDICATOR Russian patent published in 2011 - IPC G01K11/00 F16B19/06 F16B5/04 

FIELD: machine building.

SUBSTANCE: overheating indicator is made from alloy with shape memory effect and shaped to round washer of diameter D_w with screw hole of diameter D₀. Initially, washer features flat shape with eight segments made by shaped radial and annular cutouts. L_p-long radial cutouts are made through 90 angular degrees running from water outer edges to change into annular cutouts diverging in both sides from radial cutouts. Reverse side of said indicator is coated with bright heat resistant elastic film. Alloy in region of segments is assigned a phase transition at design temperature into tubes of cylindrical geometry. Indicator geometrical characteristics are calculated from the following relationships: L_p=L_K=D₀=D_w/2π, D_c=L_K/2π, where D_c is cylindrical tube diameter after phase transition. With significant thermal load acting on overheating indicator, washer reverse side coated with elastic heat resistant side becomes visible to facilitate perception. Note here that revolving, thus shaped, washer creates acoustic effect, that is, a peculiar whistle.

EFFECT: perfected design, higher safety.

3 dwg