CN-121993605-A - Movable fireproof sealing structure of airplane

CN121993605ACN 121993605 ACN121993605 ACN 121993605ACN-121993605-A

Abstract

The invention belongs to the technical field of aviation fireproof structures, and discloses a movable fireproof sealing structure of an airplane, which comprises a rubber fireproof cover, a pressing plate and a fireproof labyrinth component, wherein the rubber fireproof cover, the pressing plate and the fireproof labyrinth component are arranged on a supporting rod, the rubber fireproof cover and the pressing plate form a movable fireproof structure part of a fire area, the pressing plate presses the rubber fireproof cover on a wall of a fire wall, the supporting rod penetrates through the fire wall, the rubber fireproof cover is wrapped outside a joint of the supporting rod and the fire wall, the fireproof labyrinth component is arranged on one side of the non-fire area, the fireproof labyrinth component is sleeved outside the supporting rod and seals a hole of the fire wall through which the supporting rod penetrates, and the fireproof labyrinth component has radial motility. The structure of the invention does not obviously increase the weight of the structure, can ensure that the stay bar type structure passing through the fire area interface meets the airtight and watertight fireproof sealing requirements, and can ensure that the stay bar passing through the fire area interface moves in the axial and circumferential directions of the stay bar.

Inventors

LI WEIHAN
DAI WEI
Shu Kecheng
PAN RIJIN

Assignees

中航通飞华南飞机工业有限公司

Dates

Publication Date: 20260508
Application Date: 20260210

Claims (8)

1. The movable fireproof sealing structure of the aircraft is characterized by comprising a rubber fireproof cover (1), a pressing plate (2) and a fireproof labyrinth component, wherein the rubber fireproof cover (1) and the pressing plate (2) form a movable fireproof structure part of a fire area, the pressing plate (2) presses the rubber fireproof cover on a wall of a fire wall, the supporting rod penetrates through the fire wall, the rubber fireproof cover (1) wraps the connecting part of the supporting rod and the fire wall, the fireproof labyrinth component is arranged on one side of the non-fire area, the fireproof labyrinth component is sleeved outside the supporting rod and seals a hole of the fire wall penetrated by the supporting rod, and the fireproof labyrinth component has radial motility.
2. The aircraft movable fire protection seal of claim 1 wherein a plurality of annular cavities are formed in series in the fire protection labyrinth assembly, each annular cavity having a baffle structure disposed therein.
3. An aircraft movable fire seal according to claim 2 wherein the barrier structure is formed by a sleeve over the support rod.
4. A movable fire-proof sealing arrangement for an aircraft according to claim 3, characterised in that the rod sleeve passes through the fire wall, the rod sleeve radially contacts the inner wall of the rubber fire-proof cover (1) on the fire zone side, the rod sleeve extends out of the fire-proof labyrinth assembly on the non-fire zone side and an annular baffle is provided at the outlet of the fire-proof labyrinth assembly.
5. A movable fire protection seal for an aircraft according to claim 3 wherein there are 3 annular chambers.
6. The movable fireproof sealing structure of the aircraft according to claim 5, wherein the fireproof labyrinth assembly comprises a base (3), a middle ring (4), an upper ring (5) and a top ring (6), the base (3) is an annular body with an L-shaped cross section, the base (3) is fixedly installed on a wall on one side of a fire-free area of a firewall, the middle ring (4) is an annular body with a Z-shaped cross section, the inner annular wall of the middle ring (4) is pressed outside the outer annular wall of the base (3), a first side of the middle ring (4) is connected with the firewall, a second side of the middle ring (4) and the base (3) jointly form a first annular cavity, the upper ring (5) is an annular body with a T-shaped cross section, the first side inner annular wall of the upper ring (5) is pressed outside the outer annular wall of the middle ring (4), the lower side of the upper ring (5) and the second side of the middle ring (4) jointly form a second annular cavity, and the top ring (6) is jointly pressed on the second side of the upper ring (6) and the second side of the upper ring (5) and the second side of the upper ring (6) jointly forms a third annular cavity.
7. The movable fireproof sealing structure of the airplane according to claim 6, wherein a vibration gap is arranged between the base (3), the second edge of the middle ring (4), the lower edge of the upper ring (5) and the bottom of the second edge of the top ring (6) and the rod sleeve.
8. A movable fire-proof sealing structure for aircraft according to claim 3, characterized in that the rubber fire-proof cover (1) is internally coated with a heat-expandable fire-proof paint, the surface of the rod sleeve is coated with a heat-expandable fire-proof paint, and the inner surface of the fire-proof labyrinth component is coated with a heat-expandable fire-proof paint.

Description

Movable fireproof sealing structure of airplane Technical Field The invention belongs to the technical field of aviation fireproof structures, relates to a fireproof sealing structure for a supporting structure penetrating through a fire area interface, and particularly relates to a movable fireproof sealing structure of an airplane. Background For the field of aeronautical structural design, important structures such as nacelle engine connection struts, which are indispensable for crossing fire zone interfaces. According to the requirements associated with airworthiness terms, an airtight seal is to be achieved for the fire zone interface and no flame can pass from the fire zone to the non-fire zone. Meanwhile, for the stay bar passing through the interface of the fire area, the stay bar can change along the axial movement of the stay bar due to the change of tensile load and compressive load due to the structural vibration and the load change, and meanwhile, the stay bar can make conical swing, namely move along the circumferential direction of the stay bar due to the load change and the structural vibration. In view of the requirements of airworthiness clauses, a common solution idea of the existing aviation design is to make a stay bar penetrating through a fire area interface and a peripheral structure together to form a curing fireproof seal, so that the peripheral structure and the stay bar move simultaneously in coordination to realize sealing. And meanwhile, the stay bars can move along the axial direction and the circumferential direction of the stay bars when the aircraft flies, so that the peripheral structural strength can be enhanced, and the structural damage can be prevented. The method can greatly increase the structural weight of the aircraft, and can possibly generate gaps due to sealing aging when the stay bars and the peripheral structures move in a coordinated manner, so that the fire resistance of the fire area interface of the aircraft is finally reduced. Disclosure of Invention In order to solve the problems, the invention provides a movable fireproof sealing structure of an aircraft, which enables a brace rod structure passing through a fire area interface to meet the fireproof sealing requirement on the premise of not strengthening the peripheral structure of the brace rod and not jointly solidifying and sealing with the peripheral structure and not remarkably increasing the weight of the structure. The technical scheme of the invention is as follows: A movable fireproof sealing structure of an aircraft comprises a rubber fireproof cover, a pressing plate and a fireproof labyrinth component, wherein the rubber fireproof cover, the pressing plate and the fireproof labyrinth component are arranged on a supporting rod, the rubber fireproof cover and the pressing plate form a movable fireproof structure part of a fire area, the rubber fireproof cover is pressed on a wall of a fire wall by the pressing plate, the supporting rod penetrates through the fire wall, the rubber fireproof cover is wrapped outside a joint of the supporting rod and the fire wall, the fireproof labyrinth component is arranged on one side of the non-fire area, the fireproof labyrinth component is sleeved outside the supporting rod and seals a hole of the fire wall through which the supporting rod penetrates, and the fireproof labyrinth component has radial motility. Further, a plurality of annular cavities connected in series are formed in the fireproof labyrinth assembly, and each annular cavity is internally provided with a baffle structure. Further, the baffle structure is composed of a rod sleeve sleeved on the supporting rod. Further, the rod sleeve penetrates through the fire wall, the rod sleeve radially contacts with the inner wall of the rubber fireproof cover on one side of the fire area, extends out of the fireproof labyrinth assembly on one side of the non-fire area, and is provided with an annular baffle plate at the outlet of the fireproof labyrinth assembly. Further, the number of the annular cavities is 3. Further, the fireproof labyrinth component comprises a base, a middle ring, an upper ring and a top ring, wherein the base is an annular body with an L-shaped cross section, the base is fixedly arranged on a wall on one side of a fire area of a fire wall, the middle ring is an annular body with a Z-shaped cross section, the inner annular wall of the middle ring is pressed outside the outer annular wall of the base, the first edge of the middle ring is connected with the fire wall, the second edge of the middle ring and the base jointly form a first annular cavity, the upper ring is an annular body with a T-shaped cross section, the first edge of the upper ring is pressed outside the outer annular wall of the middle ring, the lower edge of the upper ring and the second edge of the middle ring jointly form a second annular cavity, the first edge of the top ring is pressed outside the outer annular