专利汇可以提供Control lever for the pitch angle of a blade in a turbomachine专利检索,专利查询,专利分析的服务。并且A control lever for the pitch angle of a blade in a turbomachine, said lever having a first end intended to be mounted on a blade pivot so as to rotate it and a second end comprising a cylindrical peg for mounting on a control annulus, this peg being fixed by crimping of one of its ends in an orifice of the second end of the lever and comprising an annular flange to which is applied the second end of the lever, wherein stress distribution means are interposed between the second end of the lever and the crimped end of the peg.,下面是Control lever for the pitch angle of a blade in a turbomachine专利的具体信息内容。
The present invention relates to a control lever for the pitch angle of a blade in a turbomachine, in particular for the pitch angle of a straightener in a compressor stage of the turbomachine.
The adjustment of the pitch angle of certain stator blades in a turbomachine is intended to optimize the efficiency of this turbomachine and to reduce its fuel consumption in the various flight configurations. This adjustment is generally carried out, for one or more rows of blades, by means of a control annulus which externally surrounds the stator of the turbomachine and which is rotatable about the longitudinal axis of the stator by a drive means such as a ram or an electric motor. The rotation of the annulus is transmitted by control levers of the linkage type to the blades of the row, each control lever being secured to a blade at one of its ends and carrying at its other end a peg which is engaged in a cylindrical housing of the control annulus.
The peg is mounted in an orifice of the end of the lever and is fixed to the lever by crimping, this operation consisting in squashing the end of the peg onto the end of the lever which rests on an annular flange of the peg. This operation engenders significant stresses in that part of the lever on which the crimping of the peg is carried out, thus making this part of the lever more fragile.
When adjusting the pitch angle of the blades, the control lever is subjected to bending forces at its end carrying the peg and the peg is subjected to torsional forces.
The mechanical strength of the lever being decreased by the crimping of the peg, cracks or fissures may appear on the lever after a certain operating time of the turbomachine and cause the breakage of the control lever, which may provoke the shutdown of the turbomachine and must therefore be regarded as a very serious incident.
The present invention is aimed essentially at eliminating this risk of breakage of the control levers.
Accordingly it proposes a control lever for the pitch angle of a blade in a turbomachine, said lever having a first end intended to be mounted on a blade pivot so as to rotate it and a second end comprising a cylindrical peg for mounting on a control annulus, this peg being fixed by crimping of one of its ends in an orifice of the second end of the lever and comprising an annular flange to which is applied the second end of the lever, wherein stress distribution means are interposed between the second end of the lever and the crimped end of the peg.
Thus, during the crimping of the peg onto the lever, the surface of the lever is no longer in direct contact with the crimped part of the peg and the crimping stresses are distributed over a surface area of the lever that is sufficient to avoid making the lever more fragile.
According to a characteristic of the invention, the stress distribution means comprise a washer. The washer makes it possible to distribute the crimping stresses over a sufficient surface area and has the advantage of being simple and very inexpensive.
In a first embodiment of the invention, the washer is made of a more flexible material than that of the control lever. This allows the washer to absorb the mechanical crimping loads by deforming plastically and to effectively protect the second lever end against any mechanical attack during crimping.
In another embodiment of the invention, the washer is made of a harder material than that of the control lever. This washer has less tendency to deform than in the first embodiment and distributes the crimping stresses better.
In this case to reduce the risks of attack of the second end of the lever, the substantially plane annular surface of the washer, applied to the second end of the lever, exhibits a convex or chamfered annular edge at its outer periphery.
In a general manner, an advantage of the present invention is the simple, effective and inexpensive avoidance of the risks of breakage of the control levers for the pitch angle of the straighteners of the compressor stages in a turbomachine, which might result from the crimpings of the pegs at the ends of the levers.
Other advantages and characteristics of the invention will become apparent from reading the following description given by way of non-limiting example and with reference to the appended drawings in which:
Represented in
The blades 2 of the stator are straighteners whose angular orientation is adjustable with the aid of control levers 4, rotated by a control annulus 5 actuated by a ram or an electric motor.
Each control lever 4 is fixed by an end 6 to a radial pivot 7 of a blade 2, the pivot 7 being guided in rotation in a bearing 8 mounted in a radial orifice of the casing 9. The other end 10 of the control lever 4 carries a peg 11 which is crimped to this end 10 of the control lever 4 and is guided in rotation in a cylindrical socket 12 of the control annulus 6.
An angular movement of the control annulus 5 about its axis is manifested as a rotation of the levers 4 about the axes of the pivots 7 and by the rotating of the blades 2 about these axes.
Before crimping, the peg is a straight cylindrical element which exhibits an annular flange 13 in the vicinity of one of its ends. This flange 13 forms a support for the end 10 of the lever 4, which comprises an orifice in which is engaged the upper end 14 of the peg. This end of the peg 11 comprises, above the flange 13, a cylindrical axial bore serving for the crimping of the peg onto the end 10 of the lever. The crimping is carried out by press-fitting of an appropriate tool into the bore so as to turn down and flatten the upper end 14 of the peg onto the end 10 of the lever as represented in
During crimping, the lever end 10 applied to the flange 13 of the upper end 14 of the peg experiences the crimping loads directly, and these may make it more fragile. While operational, during the angular adjustment of the blades, these ends of the levers work in bending while the pegs work in torsion, and are subjected to the vibrations of the turbomachine, which make the levers even more fragile. This may eventually cause the breakage of the end 10 of a lever.
The present invention makes it possible to eradicate this risk by virtue of the stress distribution means interposed between the crimped end of the peg and the end 10 of the control lever 4.
In the embodiment of
In a second embodiment according to the invention, represented in
This configuration of the washer 17 makes it possible not to create any stress peaks in the lever 4 at the outer periphery of the washer, during crimping, the convex rounding 19 or the chamfer 20 making it possible to gradually release the stresses in the material of the lever 4.
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