Freeze guard for the KamAZ air brake system

The antifreeze guard is designed to protect pipelines and devices of the pneumatic brake drive from condensate freezing

Evaporative type fuse; It uses ethyl alcohol as a working fluid.

Freeze guard: 1 - wick spring; 2 - glass; 3 - wick; 4 - jet; 5 - seal; 6 - body; 7 - rod

The main parts of the fuse are glass 2, body 6 with air channel A and jet 4, rod 7, seal 5 and wick 3 made of hygroscopic material, put on spring 1.

Glass 2 serves as a reservoir for working fluid (200 or 1000 cm 3).

Jet 4 is designed to equalize pressure in the air channel of the lid and the glass.

Using rod 7, pressed by spring 1, the fuse can be connected or disconnected from the pneumatic system.

When turned on, rod 7 is in the upper position, the seal is removed from its socket, wick 3 is inserted by the handle into the air channel "A" of the housing.

Compressed air from the compressor enters air channel “A” and carries alcohol particles from the wick into the pneumatic system.

At the same time, part of the compressed air entering the fuse through the gap between the rod and the body, as well as through the nozzle hole, enters the glass.

Flowing over the surface of alcohol, the air is saturated with its vapor.

In both cases, alcohol absorbs moisture from the air and turns it into condensate with a fairly low freezing point.

In the lower position of the rod 7, the wick 3 is recessed, the reservoir and the pneumatic system are separated by a seal and the evaporation of alcohol stops.