GAS TURBINE ENGINE ACCESSORY BOX ATTACHMENT Russian patent published in 2023 - IPC F02C7/25 F02C7/20 

FIELD: engine building.

SUBSTANCE: GTE accessory box drive designs to be used in GTE. Fire-protective casings are installed on the lugs of the accessory box, which, during fire tests, protect the lugs of the accessory box attachment from direct exposure to the burner flame. During certification, fire tests of the accessory box are carried out, during which the suspension lugs of the accessory box take significant loads and are exposed to a burner flame with a temperature of (1100±80)°C for 15 minutes, therefore, to protect them, it is necessary to apply constructive measures that prevent direct exposure to the burner flame. To achieve this task, according to the claimed invention, on the lugs of the accessory box located, for example, in the intercircuit space or on the outer casing of the engine, a fire-protective casing with a fire-retardant coating is installed, comprising of left and right components connected to each other and fixed on the lugs with a tightening bolt, nut, washer, and ceramic bushings. Whereas this fire-retardant coating is applied to the inner surface of the fire-protective casings. An important design condition that ensures the effect is a cavity between the casing and the suspension parts, which ensures the installation and dismantling of the accessory box, and in case of fire, due to the swelling of the fire-protective materials and filling this cavity with it, it prevents further ignition and heat transfer to protected surfaces and completely prevent direct fire contact with suspension parts.

EFFECT: compliance of the gas turbine engine with the requirements of paragraph 33.17 of AP-33 Fire Safety.

3 cl, 1 dwg