CN113894732B - Decomposition process of fan stator assembly - Google Patents

Abstract

The invention aims to provide a decomposition process of a fan stator assembly, which can grade guide vanes in an integral decomposition way. Selecting a circular ring structure formed by the upper flange edge of the inner edge plate of the whole circle of guide vanes as a clamping part; providing a fixing ring, wherein a plurality of connecting holes are formed in the circumferential direction of the fixing ring; placing the securing ring on the upper side of the upper flange so that the attachment hole of the securing ring is aligned with the attachment hole of the upper flange; bolts are passed through the aligned attachment holes and secured with nuts to attach the discrete upper flange edges or the full turn vane as a unit by the securing ring; removing the threaded fasteners of the guide vane and the casing; lifting the casing and the guide vane simultaneously; uniformly applying downward force along the circumferential direction of the outer edge of the casing until the casing is separated from the guide vane; transferring the whole circle of guide vanes to a platform; and loosening the bolts, removing the fixing ring, and scattering the guide vane into single parts.

Description

Decomposition process of fan stator assembly

Technical Field

The invention relates to a disassembly process of a fan stator assembly.

Background

The fan stator assembly shown in fig. 1 and 2, i.e. the aircraft engine fan outlet guide vane assembly, is an important component of an aircraft engine, the main functions of which are flow guiding and bearing. The assembly consists of a plurality of fan outlet guide blades (also known as OGVs or vanes or guide blades or vanes) 1 and a casing 1, the vanes 1 being secured to the inner wall of the casing 2 by threaded fasteners 3 to form a complete ring. In order to improve the bearing performance of the stator assembly, the inner edge plates 12 of the guide vanes 1 are designed to be of an inclined platform structure, when forming a whole ring, the guide vanes 1 are mutually meshed with each other at the adjacent edges 10, each vane can bear the radial force of the rotor, the bearing performance of the stator assembly is greatly improved, and the service life is also greatly prolonged. For the guide vane, under the traditional process, a piece-by-piece decomposition process is adopted, and because the inner edge plates of the blades are of an inclined platform structure and are mutually meshed, the decomposition of single blades cannot be realized in one step, and the blades can be pulled out of the casing only by adopting spiral decomposition. During decomposition, one blade is selected, the middle section of the blade is pinched by two hands, the blade is pulled loose by upward force along the direction of the inclined table, as shown in fig. 1, the next adjacent guide vane 1 is selected clockwise, the same operation is adopted to pull loose, and the rest guide vanes are sequentially selected according to the mode and pulled loose until the whole circle of blades are pulled loose; then according to the blade sequence, the first guide vane is pulled upwards for a small distance, and the next adjacent guide vane is pulled upwards for the same distance according to the clockwise direction until the guide vane is pulled upwards for the same distance in the whole circle; by adopting the mode, the next round of small-amplitude lifting is carried out according to the blade sequence, and the operation is repeated for a plurality of rounds until the circumferential movement amount between adjacent guide vanes becomes larger after all the guide vanes are pulled out of the casing beyond the axial direction by 2/3 height, the guide vanes are not meshed any more, and all the guide vanes are taken out of the casing 2 one by one according to the guide vane sequence. The decomposition mode has higher requirements on the experience of operators, the pull-out amount of each blade of each wheel is approximately the same when the operators decompose, once the pull-out amount of a certain guide blade is overlarge, all the guide blades are mutually bitten, the guide blades become nondegradable, in addition, the guide blades are influenced by gravity when pulled out, the guide blades inevitably have falling tendency, the guide blades have no fixing device, a plurality of operators are required to mutually cooperate, and each operator holds a plurality of guide blades by both hands, so that the whole circle of guide blades are maintained at the same height.

The single-chip decomposition mode is very complicated, the decomposition period is long, and the guide vanes can be completely decomposed only through 8-10 rounds of operation in cooperation with a plurality of people, and the single-chip decomposition mode is converted into single-person working equivalent, and all the guide vanes can be decomposed only after more than 4 hours, so that mistakes are very easy to occur during operation, and the guide vanes are blocked and cannot be decomposed.

Disclosure of Invention

The invention aims to provide a decomposition process of a fan stator assembly, which can grade guide vanes in an integral decomposition way.

The fan stator comprises a casing and a whole circle of guide vanes inserted and fixed in the casing, and the fan stator comprises:

selecting a circular ring structure formed by the upper flange edge of the inner edge plate of the whole circle of guide vanes as a clamping part;

providing a fixing ring, wherein a plurality of connecting holes are formed in the circumferential direction of the fixing ring;

placing the securing ring on the upper side of the upper flange so that the attachment hole of the securing ring is aligned with the attachment hole of the upper flange;

bolts are passed through the aligned attachment holes and secured with nuts to attach the discrete upper flange edges or the full turn vane as a unit by the securing ring;

removing the threaded fasteners of the guide vane and the casing;

lifting the casing and the guide vane simultaneously;

uniformly applying downward force along the circumferential direction of the outer edge of the casing until the casing is separated from the guide vane;

transferring the whole circle of guide vanes to a platform;

and loosening the bolts, removing the fixing ring, and scattering the guide vane into single parts.

In one embodiment, a plurality of flexible slings are passed through gaps between a plurality of vanes, respectively, to encase different vanes, and the fan outlet vane assembly is lifted by the flexible slings.

In one embodiment, the downward force is applied to the casing by tapping the casing evenly.

In one embodiment, the bolts are evenly distributed along the fixation ring.

In one embodiment, the inner side of the retaining ring extends downwardly with a flange.

In one embodiment, the collar extends from the entire circumference of the retaining ring.

The technical scheme provides a whole-ring decomposing process of the guide vane, the guide vane is fixed on a fixed ring through the connecting hole of the front flange edge of the guide vane inner edge plate, the guide vane is separated from the casing after being integrally formed, the fixed ring is removed from the guide vane, the guide vane can be scattered into zero-order one by one, the decomposing mode can avoid the influence of the inclined table structure of the inner edge plate, the spiral decomposing process is not needed, the decomposing difficulty of the guide vane is greatly reduced, and the decomposing efficiency is greatly improved. Therefore, the invention has the following beneficial effects:

1. the guide vane combined whole ring decomposition is provided, so that the parts are prevented from being decomposed one by one, and the guide vane decomposition difficulty is reduced;

2. the adopted decomposition tool has simple structure, easy operation and high efficiency;

3. high decomposition efficiency and low process cost.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which:

FIG. 1 is a partial schematic view of a fan stator assembly.

FIG. 2 is a schematic partial view, in semi-section, of a fan stator assembly.

FIG. 3 is a schematic illustration of an exploded process of a fan stator assembly.

FIG. 4 is a schematic partial view in half section of a fan stator assembly with tooling installed.

Fig. 5 is a flow chart of an exploded process of the fan stator assembly.

Fig. 6 is a schematic view of a retaining ring.

Fig. 7 is a partial cross-sectional view of the tooling.

Detailed Description

The following discloses a number of different embodiments or examples of implementing the subject technology. Specific examples of components and arrangements are described below for purposes of simplifying the disclosure, and of course, these are merely examples and are not intended to limit the scope of the invention. For example, a first feature described later in this specification may be formed above or on a second feature, and may include embodiments in which the first and second features are formed in direct contact, as well as embodiments in which additional features may be formed between the first and second features, such that no direct contact may be made between the first and second features. In addition, the disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, where a first element is described as being coupled or combined with a second element, the description includes embodiments in which the first and second elements are directly coupled or combined with each other, and also includes embodiments in which one or more other intervening elements are added to indirectly couple or combine the first and second elements with each other.

As shown in fig. 1 and 2, the inner edge plate 12 of the guide vane 1 has a front flange edge 110 and a rear flange edge 120. The front flange 110 faces upwards when the guide vane 1 is inserted into the casing 2 or is detached from the casing 2. The front flange 110 of the full turn vane is abutted in a circular configuration, as is the rear flange 120. The inner flange plate 12 is a ramp so that the rear flange 120 is positioned radially outward of the front flange 110, which can be difficult and time consuming to disassemble from the single piece as described above.

Fig. 6 and 7 show a tooling used in the decomposition process, wherein:

the fixed ring 41 is of a circular ring structure, and a plurality of connecting holes are formed in the circumferential direction and correspond to the connecting holes of the front flange edge;

bolts 42 for fixing the guide vanes to the fixing ring to form a whole;

a nut 43 for fixing the guide vane to the fixing ring to form a whole;

the guide vane lifting device also comprises a hanging belt shown in fig. 3, wherein a nonmetal flexible soft rope passes through a gap between guide vanes to cover the guide vanes, so that the whole circle of guide vane lifting is realized.

The fixing ring 41 may be formed in a shape similar to that of the front flange 110 and may be stacked on the upper side of the front flange 110, and the fixing ring 41 may further have coupling holes uniformly distributed in the circumferential direction corresponding to the coupling holes of the front flange 110.

As shown in fig. 3 and 4, the fixing ring 41 is coupled to the front flange 110 by bolts 42 and fastened by nuts 43.

As shown in fig. 5, the disassembly process of the fan stator assembly includes a plurality of steps. Before the step shown in fig. 5 is executed, a circular ring structure formed by the upper flange edge of the inner edge plate of the whole circle of guide vanes is selected as a clamping position. A retaining ring as shown in fig. 6 is then provided, which is circumferentially open with a plurality of attachment holes.

Then, in step 1, as shown in fig. 3 and 4, the fixing ring 41 is placed on the upper side of the front flange side 110.

Next, in step 2, the fixing ring 41 is adjusted such that the coupling hole of the fixing ring 41 is aligned with the coupling hole of the front flange 110.

Next, as shown in fig. 4, in step 3, each vane 1 is fastened to the fastening ring 41 by bolts 42 passing through the aligned connection holes and fastened by nuts 43, and the discrete front flange 110 or the whole circle of vanes 1 is connected as a whole by the fastening ring 41.

In step 4, as shown in fig. 3, a plurality of hanging strips 5 are uniformly distributed to pass through gaps among the guide vanes 1 and then to cover the corresponding guide vanes 1.

In step 5, the fan stator assembly is lifted by hooking the sling with a crane.

In step 6, the threaded fastener 3 between the vane 1 and the casing 2 is disassembled.

In step 7, as shown in fig. 3, a downward force F is applied, for example, the casing 2 is uniformly struck circumferentially with a plastic hand hammer, until the casing 2 is disengaged from the guide vane 1.

In step 8, the entire turn of guide vanes is transferred to an operating platform by a crane.

In step 9, the bolts 42 and nuts 43 shown in fig. 7 are loosened, and the fixing ring 41 is removed, so that the whole circle of guide vanes can be scattered into a single part.

As shown in fig. 7, the inner peripheral side of the fixing ring 41 has a downwardly extending convex edge 410, and the convex edge 410 serves to assist in positioning the fixing ring 41 on the front flange side 110.

The flange 410 extends from the whole circle of the fixing ring 41, so that the strength of the fixing ring 41 can be enhanced, and the whole circle of guide vanes are connected into a whole structure strength.

The foregoing embodiment has the following features:

1. breaking through the prior method of decomposing parts one by one, creatively providing a technological method for decomposing the guide vane in a whole ring, so that the inclined table factors cannot become limiting conditions for decomposing the guide vane;

2. all guide vanes are connected into a whole through a fixing ring, and the inclined table is not an influencing factor in the decomposition process;

3. the whole circle of guide vane hanging is realized by a mode that a hanging belt (a flexible soft rope) passes through a gap between the guide vanes to wrap the guide vanes;

4. after the guide vane is integrally decomposed, the fixed ring is removed, so that the guide vane can be scattered into single parts, and the decomposition difficulty of the guide vane is greatly reduced.

While the invention has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the invention, as will occur to those skilled in the art, without departing from the spirit and scope of the invention. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention fall within the protection scope defined by the claims of the present invention.

Claims (3)

1. The utility model provides a decomposition technology of fan stator subassembly, this fan stator includes the receiver and cartridge and fixes the interior whole circle stator of receiver, its characterized in that includes:

selecting a circular ring structure formed by the upper flange edge of the inner edge plate of the whole circle of guide vanes as a clamping part;

providing a fixing ring, wherein a plurality of connecting holes are formed in the circumferential direction of the fixing ring;

placing the securing ring on the upper side of the upper flange so that the attachment hole of the securing ring is aligned with the attachment hole of the upper flange;

uniformly distributing bolts along the fixing ring, penetrating the aligned connecting holes through the bolts and fixing the bolts by nuts so as to connect the discrete upper flange edges or the whole circle of guide vanes into a whole through the fixing ring;

removing the threaded fasteners of the guide vane and the casing;

respectively penetrating a plurality of flexible hanging strips through gaps among a plurality of guide vanes to pocket different guide vanes, and lifting the casing and the guide vanes through the flexible hanging strips to lift the casing and the guide vanes simultaneously;

uniformly applying downward force along the circumferential direction of the outer edge of the casing by uniformly knocking the casing until the casing is separated from the guide vane;

transferring the whole circle of guide vanes to a platform;

and loosening the bolts, removing the fixing ring, and scattering the guide vane into single parts.

2. The process of claim 1, wherein the inner side of the retaining ring extends downwardly with a flange.

3. The process of claim 2 wherein said flange extends from said retaining ring for a full turn.