IK 250

The implosion damper is used for fireplaces that are operated in positive and negative pressure so that no flue gas can escape when the fireplace is operated as intended.

During normal, trouble-free operation, the spring keeps the cover plate closed. If the combustion air damper on the burner is closed due to a power failure, the chimney can no longer draw in air via the boiler. The “missing” air now flows in via the implosion damper. This prevents the so-called Joukowski impact by immediately opening the cover plate.

Practical example: If, for example, the supply air is cut off from the chimney during a sudden power failure, the high negative pressure in the chimney can cause the connecting pipe to contract and deform. The negative pressure can be so strong that the flue gas pipe collapses and the system is irreparably destroyed. Since the stall is instantaneous, the implosion damper must open very quickly to allow air to flow into the chimney. Depending on the system capacity, several of these dampers must be installed.

If the boiler starts up again and/or the vacuum is released, the flap closes automatically due to the spring action. The plant can resume normal operation.

The implosion damper with closed cover flap

The implosion damper with open cover flap

Consequences of a Joukowski impact

Consequences of a Joukowski impact

Consequences of a Joukowski impact due to a sudden increase in pressure (e.g. deflagration) followed by a decrease in pressure