RU2211984C1 - Method of replacing flexible sealing rings in ball joints of pipeline of aircraft anti-icing system - Google Patents

Abstract

FIELD: aircraft production. SUBSTANCE: ball is turned inside spherical joint into split truncated part of ring groove. U-shaped groove is cut on surface of ball from ring groove to edge of its truncated part. New sealing ring is fitted in U- shaped groove. Ball is turned and part of sealing ring is brought into sphere. Sealing ring is finally fitted in ring groove of ball. EFFECT: facilitated replacement of sealing and packing rings, reduced downtime of aircraft at repair. 7 dwg

Description

 The invention relates to the field of aircraft construction, and in particular to methods of installation of pipeline equipment, and can be used to seal the spherical parts of the pipes of the aircraft anti-icing system when replacing burned-out elastic sealing rings.

 A known method of replacing elastic o-rings in ball joints of parts of the pipeline of the anti-icing system of an aircraft, which consisted in first determining a defective burnt-in o-ring made of elastic material according to tolerance standards, for example, by the value of visually permissible play or by measuring the allowable clearance, etc. , then divide the joint in the spherical connection of the pipeline and remove the o-ring (by any of the known methods) from the annular groove of the ball, which has an internal cavity for the passage of air into the pipeline (see TU-154 M aircraft overhaul manual, section 030.20.02, p. 3/4, fig. 1, 1992).

 If the backlash is exceeded or other violations of the limit tolerance are made, this connection is completely rejected or must be repaired, for example, by crimping a spherical connection on a lathe.

 However, the known method has a number of significant disadvantages.

The absence of a new o-ring instead of a burnt one does not ensure the tightness of the connection due to which:
- there is a leak of hot air and its impact on the frame and skin of the structure of the airframe, which reduces the life of the aircraft;
- reduced or no mobility of the ball in the pipe due to its burning to the pipe during operation;
- squeezing the pipe on a lathe requires isolating, removing and installing on the machine the defective section of the pipeline from the wing structure of the aircraft, and this leads to a decrease in the bearing capacity of the pipe structure due to its repeated plastic deformation during operation of the aircraft during repair work.

 It should be noted that cutting a defective pipe section is a rather technologically difficult process, because the anti-icing system is mounted inside the wing of the wing, in the zone of low construction height and passes in hard-to-reach areas of the wing, which entails the cutting of a significant part of the wing skin. This increases the complexity of these works using welding in hard-to-reach places of the aircraft structure (at the leading edge of the wing or engine air intake). However, it should be noted that these pipes have high strength, operate in high temperature environments and have extremely thin walls, which are welded using special equipment and in a special environment, and this entails the complete dismantling of the docking unit from the place it was installed on the plane, which also creates additional difficulties during repair work.

 All of the above increases the aircraft downtime for repairs and the cost of the repair work itself.

 The objective of the present invention is to reduce labor costs, simplifying the replacement of sealing sealing rings in the ball joints of the pipeline anti-icing system of the aircraft and reducing the downtime of the aircraft and the cost of repair work.

 The solution to the technical problem is ensured by the fact that the replacement of the elastic sealing rings in the ball joints of the pipeline anti-icing system of the aircraft is carried out in the following order.

 After determining the defective connection, the pipe is disconnected in a spherical hinge and the sealing ring burnt out or rejected according to other indicators through the connector in the spherical part of the pipe from the annular groove of the hollow inside the ball is removed (by any known method), then the ball is rotated inside the spherical connection until the annular grooves, after which a U-shaped groove is cut out on the surface of the ball from the annular groove to the edge of its truncated part, into which a new elastic seal is then laid ring, while the ring is laid with rotation and entering the annular groove of the ball in its accessible zone, and then the ball with the laid part of the ring is rotated, first removing the section with the U-shaped groove inside the sphere, and then continue to scroll the ball inside the sphere and lay in annular groove the sealing ring until the U-shaped groove exits the sphere with the sealing ring laid in it, then part of the ring is removed from the U-shaped groove and completely fit into the annular groove of the ball.

 The implementation of this method can be carried out on the ball joints of the pipelines of the anti-icing system of the aircraft.

 In FIG. 1 shows a pipe section with a ball joint without a sealing ring (side view).

 Figure 2 is the same, front view of the truncated part of the sphere.

 In FIG. 3 is the same side view of a ball joint with a partially inserted sealing ring in a U-shaped groove and an accessible part of the annular groove.

 In FIG. 4 is the same, front view of the sealing ring partially laid in the grooves before the ball rotates and the U-shaped part is inserted inside the sphere.

 Figure 5 - the same, a new o-ring is laid in the annular groove of the ball and is inside the sphere.

 Figure 6 is the same side view when the ball is scrolled together with the seal into the inaccessible part of the sphere.

 7 depicts a U-shaped groove made on a portion of the surface of the ball.

 The implementation of the method is as follows.

 After carrying out the necessary work to determine the defective connection, disconnect it and remove it from the annular groove of the ball of the used o-ring (by any of the known methods), for example, cut the seal and clean the annular groove of the ball from the remnants of the o-ring (not shown), ball 1 located inside the sphere 2 pipes 3 are turned (see Fig. 1) until the annular groove 4 exits into the detachable truncated part of the sphere 2. Then, on the outer surface of the ball 1, from the annular groove 4 to the edge of its truncated part, cut U-about ase groove 5. Ball 1 has a cavity inside the hot air passes through the pipes of the aircraft anti-icing system. In the U-groove 5 of the ball 1, a new elastic sealing ring 6 is laid with its rotation and laying in the annular groove 4 (see Fig. 3, 4) on the accessible part of the ball 1 in the truncated part of the sphere 2. Thus, the part of the elastic sealing ring is tucked 6, the ball 1 is rotated and inserted inside the sphere 2, the mentioned ring, laid on the site in the U-shaped groove, and then continue to scroll it inside the sphere 2 until the U-shaped groove 5 with the ring 6 from the sphere 2. Comes out of the U-groove 5 part of the ring 6 and lay it finally in the ring Ball groove 1.

 A new O-ring 6 is laid in the annular groove 4 of the ball 1 of the pipeline. If desired, an L-shaped screen 7 can be placed in the annular groove 4 under the new O-ring 6 in the area of the U-shaped groove 5 to overlap the groove 5 and protect part of the O-ring 6 in this area from the effects of hot air passing through the pipeline of the aircraft anti-icing system. Then you can rotate the ball 1 to the position, as shown in Fig.6.

 The use of the invention will simplify the process of replacing sealing o-rings made of elastic material installed in ball joints, and in particular in ball joints of aircraft anti-icing system pipelines, which significantly reduces aircraft downtime and reduces the cost of repairs.

Claims (1)

 A method for replacing elastic sealing rings in ball joints of an anti-icing system pipe of an airplane, comprising defining a defective joint and removing a sealing ring in a detachable defective joint located in an annular groove truncated on two opposite sides and hollow inside a ball mounted inside a spherical joint of a pipe part pipeline, characterized in that the ball is rotated inside a spherical connection to exit into its detachable truncated portion of the annular grooves, then on the surface of the ball from the annular groove to the edge of its truncated part, a U-shaped groove is cut, then a new o-ring is placed in the U-groove, rotated into the annular part of the ball groove, then the ball is rotated and part of the sealing rings laid in the U-shaped and the mentioned part of the annular groove, and then continue to scroll the ball inside the sphere and put the o-ring in its annular groove until the part of the ball with the U-shaped groove exits the sphere, then they are removed from lotnitelnoe ring from the groove and placed in its final annular ball groove.

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