TOOL FOR HOLDING A BLOWER WEDGE

Abstract

BLOWER WEDGE RETAINING TOOL The dismantling method according to the invention relates to the dismantling of a blade foot (10) (1) disposed in a housing (20) of a blower disc (2), a rigid wedge (3) being placed in the housing under the blade foot characterized in that it comprises the following steps: placing on a tooth (21) of the blower disc (2) located opposite the housing (20), a retaining tool (4) having a hole (40) of the same size as the tooth (21) of the blower disc (2) and a bearing surface (44) coming into contact with the rigid wedge (3), extraction of the blade foot (10). Thanks to the use of a holding tool secured to a tooth of the blower disc, the rigid wedge remains in its housing while the blade root extends from said housing, thus preventing any damage to the measuring wires located beneath the rigid wedge. Figure to be published with the abbreviation: Figure 4

Description

Title of the invention: TOOL FOR HOLDING A BLOWER WEDGE TECHNICAL FIELD OF THE INVENTION

[0001] The technical field of the invention is that of aeronautical engines and more particularly that of blower discs with a blade adapted to rotating stress measurements on a low pressure compressor drum. TECHNOLOGICAL BACKGROUND OF THE INVENTION

[0002] Currently, when stress measurements are to be taken in a blower, the wires are passed through a groove provided in the base of the blade below the blade wedge, but when the blade is removed, the wedge can be pulled out by the base of the blade and tear out the measuring wires, requiring them to be changed each time. Summary of the invention

[0003] The invention offers a solution to the problems mentioned above, by allowing the blade to be removed without moving either the wedge or the measuring wires so that they can be reused.

[0004] The dismantling method according to the invention relates to the dismantling of a blade foot disposed in a housing of a blower disc, a rigid wedge being placed in the housing under the blade foot, it is characterized in that it comprises the following steps: • Placement on a tooth of the blower disc positioned opposite the housing of a holding tool having a hole of the same size as the tooth of the blower disc and a bearing surface coming into contact with the rigid wedge, • extraction of the blade foot.

[0005] Thanks to the use of a holding tool locked onto a tooth of the blower disc, the rigid wedge remains in the housing while the blade foot comes out of said housing, thus avoiding any damage to the measuring wires placed under the rigid wedge.

[0006] Advantageously, the bearing surface includes a recess opposite the wires placed under the rigid wedge. The position of the measuring wires may require a space on the holding tool to prevent any damage.

[0007] Advantageously, the holding tool includes a straight plane on which the blade foot slides during extraction. This straight plane is an extension of the housing when the holding tool is positioned on the tooth, it is aligned with the wedge and thus facilitates the sliding of the blade foot.

[0008] Advantageously, the holding tool includes a guide arm that bears against an axial face of the blower disc and guides the holding tool during its installation. The guide tool can thus be positioned against an axial face of the blower disc and correctly oriented so that the hole engages properly with the blower tooth.

[0009] The invention also relates to a holding tool implemented in the process with at least one of the preceding characteristics. This holding tool can be used on all the blade feet; it simply needs to be placed on another tooth of the blower disc.

[0010] Advantageously, the retaining tool is a single piece. It is therefore simple to manufacture.

[0011] Advantageously, the retaining tool is L-shaped and the hole is arranged on a branch of the L. The other branch is located at a distance from the edge of the hole equal to the distance between the tooth and an axial face of the disc so that the hole is properly positioned opposite the tooth.

[0012] Advantageously, the arm of the L that includes the hole has a hollow end. This hollow allows the wires to pass between the holding tool and the disc. BRIEF DESCRIPTION OF THE FIGURES

[0013] The figures show an example presented by way of illustration and in no way limiting the invention,

[0014] [Fig. 1] is a local cross-section of a low pressure compressor drum with a blade foot being extracted;

[0015] [Fig.2] is a local perspective of a low-pressure compressor drum with a paddle foot, a rigid wedge and wires before extraction;

[0016] [Fig.3] is a perspective of [Fig.2] during the implementation of a tool maintenance according to the invention;

[0017] [Fig.4] is a partial cross-sectional perspective of [Fig.2] with the holding tool in place according to the invention;

[0018] [Fig.5] is a top view of [Fig.4],

[0019] [Fig.6] is a partial cross-sectional perspective of the extraction of the blade foot according to the invention. DETAILED DESCRIPTION

[0020] Unless otherwise specified, the same element appearing on different figures has a unique reference.

[0021] Throughout this description, the top of figures 1 to 4 will be referred to as "top" and the bottom of these figures as "bottom". The length in the axial direction of the blower will be referred to as "longitudinal".

[0022] As can be seen [Fig. 1], a blade 1 fixed in a housing 20 of the blower disc 2 of the X-axis (here, the illustrated X-axis is not located at the center of the disk 2, but merely indicates its direction). The blade foot 10 has a recess 101 on its lower surface 100. A rigid wedge 3 is positioned between the blade foot 10 and the housing bottom 20. The wedge 3 rests on the lower surface 100 of the blade foot 10 and has a longitudinal groove 30 on its lower part and a boss 31 on its upper part. This boss 31 fits into the recess 101 of the blade 1. The disk 2 has several teeth 21 distributed around its periphery. Wires 5 are placed in the groove 30.

[0023] When the blade 1 is removed from the housing 20, the movement M of the blade foot 10 can cause the wedge 3 and the wires 5 to be pulled out, as can be seen [Fig.1].

[0024] According to the invention, a holding tool 4 is used which will hold the rigid wedge 3 in place during the extraction of the blade 1. This holding tool 4 has a hole 40 of complementary shape to a tooth 21 of the disc 2 in order to be able to insert itself into it. It has an L-shape; one arm 41 includes the hole 40, and the other arm 42 is positioned away from the hole 40 by the distance between the upstream face of the tooth 21 and the upstream axial face 22 of the disc 2. The arm 41 has a bearing surface 44 and a recess 43 at the end opposite the other arm 42. This recess 43 has a width at least equal to the diameter of three wires 5. The bearing surface 44 has a height calculated according to the radial position of the housing 20. This height may be between 5 and 15 cm, preferably between 9 and 10 cm, for example, 9.5 cm. The bearing surface 44 has a length opposite the blade root of between 20 and 30 cm, for example, 24 cm.

[0025] We will now describe the method for dismantling the blade 1. The holding tool 4 is positioned above the disc 2, directly above a tooth 21. The hole 40 of the holding tool 4 is threaded onto the tooth 21 opposite the blade to be dismantled. The arm 42 is placed against the axial face 22 of the disc 2, thus guiding the holding tool 4 until it is fully driven onto the tooth 21 (see [Fig. 3] and 4). This arm thus forms a guide arm 420. When the tool 4 is fully driven in, the upper surface of the arm 41, forming a straight surface 410, is at the same level as the top of the wedge 3 below the lower surface 100 of the blade's foot 1.

[0026] Once the retaining tool 4 is in place, the foot 10 of the blade 1 is slid into its housing 20 (see [Fig. 6]) on top of the arm 41; the bearing surface 44 locks the wedge 3, which remains in place. The recess 43 also prevents any displacement of the wires 5 during this extraction.

[0027] To remove another blade, the tool is removed and placed on another tooth and the same procedure is repeated.

Claims

Demands

1. Method for dismantling a blade foot (10) (1) disposed in a housing (20) of a blower disc (2), a rigid wedge (3) being placed in the housing under the blade foot characterized in that it comprises the following steps: - placing on a tooth (21) of the blower disc (2) located opposite the housing (20), of a holding tool (4) in place of the rigid wedge (3) during the extraction of the blade, said holding wedge (4) having a hole (40) of the same size as the tooth (21) of the blower disc (2) and a bearing surface (44) coming into contact with the rigid wedge (3), - extraction of the blade foot (10).

2. Dismantling method according to claim 1 characterized in that the bearing surface (44) comprises a hollow (43) opposite the wires (5) placed under the rigid wedge (3).

3. Disassembly method according to any one of the preceding claims, characterized in that the holding tool (4) comprises a straight plane (410) on which the blade foot (10) slides during extraction.

4. Disassembly method according to any one of the preceding claims, characterized in that the holding tool (4) comprises a guide arm (420) bearing against an axial face (22) of the blower disc (2) and guiding the holding tool (4) during its placement.

5. Holding tool (4) implemented in the process according to one of the preceding claims, characterized in that it has a hole (40) of the same size as a tooth (21) of a blower disc (2) and a bearing surface (44) coming into contact with a rigid wedge (3).

6. Holding tool (4) according to claim 5, characterized in that it is one piece.

7. Holding tool (4) according to claim 5 or 6, characterized in that it is L-shaped and the hole (40) is disposed on a branch (41) of the L.

8. Holding tool (4) according to any one of claims 5 to 7, characterized in that the arm (41) of the L comprising the hole (40) has an end with a hollow (43).

Images