CN115704739A - Guide structure of hole detection guide wire and hole detection inspection method - Google Patents

Abstract

The invention discloses a guiding structure of a hole detection guide wire and a hole detection inspection method. The guide structure includes a guide tube, the guide tube including: a straight tube portion; and bending the tube portion; the bending pipe part is located at the downstream of the straight pipe part and connected with the straight pipe part, and the axis of the straight pipe part and the extending direction of the outlet end of the bending pipe part are arranged in a non-overlapping mode. The invention has the advantages that the guide tube can guide the guide wire to the measured point without being held by the operator all the time, thereby protecting the detection head and the interior of the engine and preventing the collision.

Description

Guide structure of hole detection guide wire and hole detection inspection method

Technical Field

The invention relates to a guiding tool for a guide wire of a hole detector, in particular to a guiding structure for a hole detector guide wire and a hole detector inspection method.

Background

In the field of aero-engines, after the aero-engine is assembled or the engine is subjected to periodic test run, auxiliary inspection needs to be carried out through a hole detector hole in a casing by means of hole detector equipment, and the hole detector hole is used for observing whether parts and components inside the engine are damaged or not. The common borehole finder equipment comprises a guide wire, a detecting head and a display, wherein the detecting head is located at the front end of the guide wire and used for shooting an internal area of a casing of the engine, the guide wire is used for transmitting data, and the display displays a shooting area of the detecting head.

Usually, a detection person is required to insert the detection head into a borehole finder hole in the casing for inspection, the inner diameter of the borehole finder hole in the casing is far larger than the outer diameter of the detection head, and the position of the detection head is completely manually controlled by the detection person in the whole process. The manual control by the inspector can not determine the depth of the guiding wire penetrating into the casing or the direction of the torsion. In the whole process, if fault points need to be accurately positioned, the operation accuracy of operators is very high. In the whole operation process, a person operating the hole detection guide line needs to always hold the hole detection guide line, and cannot carry out other work, so that physical effort is wasted, and misoperation is easy to generate. During the test process, a detection head of the hole detection equipment is easily damaged, and even an engine is damaged.

Disclosure of Invention

The invention aims to provide a guiding structure of a hole detection guide wire.

Another object of the present invention is to provide a method of hole inspection.

A guide structure of a foramen probe guide wire according to an aspect of the present invention includes a guide tube including: a straight tube portion; and bending the tube portion; the bending pipe part is located at the downstream of the straight pipe part and is connected with the straight pipe part, and the axis of the straight pipe part and the extending direction of the outlet end of the bending pipe part are arranged in a non-overlapping mode.

In one or more specific embodiments of the guide structure, a plane formed by an extending direction of the straight pipe portion and an extending direction of the bent pipe portion is defined as a first plane, and the straight pipe portion has a fixing position, so that the straight pipe portion is fixed to the casing at the fixing position; the guide structure includes: the bending direction of the first guide pipe is positioned on a plane vertical to the first plane; the bent pipe part of the first guide pipe is provided with a wave-shaped extension section, the bending radius of the wave crest and the wave trough of the wave-shaped extension section is 2-5 times of the outer diameter of the guide pipe, and the bending angle of the wave crest and the wave trough is 45-170 degrees; the bending direction of the second guide pipe is positioned on the first plane, the bent pipe part of the second guide pipe is provided with a second hook section, the included angle between the tail end and the starting end of the second hook section is 30-80 degrees, and the bending radius of the second hook section is 2-5 times of the outer diameter of the guide pipe; and/or a third guide pipe, wherein the bending direction of the third guide pipe is positioned on the first plane, the bent pipe part of the third guide pipe is provided with a third hook section, the included angle between the tail end and the starting end of the third hook section is 100-170 degrees, and the bending radius of the third hook section is 2-5 times of the outer diameter of the guide pipe.

In one or more specific embodiments of the guide structure, the bent tube portion of the second guide tube comprises a straight tube section, and the angle between the straight tube section and the straight tube portion of the second guide tube is 45-180 °; the bent pipe part of the third guide pipe comprises a straight pipe section, and the included angle between the straight pipe section and the straight pipe part of the third guide pipe is 45-180 degrees.

In one or more specific embodiments of the guide structure, the fixed position further includes a handle, the handle is fixedly connected to the straight pipe portion, the handle and the straight pipe portion define a positioning plane, a first plane of the first guide tube coincides with the positioning plane, an included angle between the first plane of the second guide tube and the positioning plane is 0 to 90 °, and an included angle between the first plane of the third guide tube and the positioning plane is 0 to 90 °.

In one or more specific embodiments of the guide structure, the handle has an asymmetric structure on two sides, and the two sides of the handle are respectively provided with a first blind hole, a second blind hole, a rectangular edge and an arc edge.

In one or more embodiments of the guide structure, the material of the guide tube is a thermoplastic material.

A method of bore inspection according to another aspect of the invention, including the use of a guide structure as described above, comprises: step A, selecting a second guide pipe of the guide structure for an area with an inspection position of the root of a stator blade of a gas turbine engine or the inner side of a rotor disc hub; selecting a first guide pipe of the guide structure for the inspection position of a rotor blade of a gas turbine engine or the end surface area of a rotor needing to be inspected in a cross-stage mode after a far hole is drilled; selecting a third guide pipe of the guide structure for a blade area with the inspection position in the circumferential direction of the gas turbine engine; b, extending the guide pipe from the exploratory hole of the casing until the guide pipe is fixed with the casing, wherein the guide pipe does not collide with components in the casing; and C, extending the guide wire of the hole detector and the detecting head into the guide tube until the detecting head reaches the inspection position.

In one or more specific embodiments of the method for inspecting a bore hole inspection, in step a, for turbine rotor blades of a gas turbine engine whose inspection positions are different stages, the first guide pipe of the guide structure is selected, for inspecting a rotor blade of an nth stage, an extension length of the bent pipe portion of the first guide pipe is selected to be a first length, and for inspecting a rotor blade of an N +1 th stage, an extension length of the bent pipe portion of the first guide pipe is selected to be a second length, and the second length is greater than the first length.

In one or more embodiments of the method for inspecting a bore hole, the guide tube is made of a thermoplastic material, and in the step B, if the guide tube collides with a component inside the casing, the guide tube is heated, and the structure of the bent tube portion is adjusted until the guide tube does not collide with the component inside the casing.

In one or more specific embodiments of the method for inspecting a bore hole, the guide structure further includes a handle, the handle and the straight pipe portion define a positioning plane, the first plane of the first guide tube coincides with the positioning plane, the first plane of the second guide tube forms an angle of 0 ° to 90 ° with the positioning plane, the first plane of the third guide tube forms an angle of 0 ° to 90 ° with the positioning plane, in step B, the guide tube is inserted from the bore hole of the casing, and the guide structure is adjusted by adjusting the position of the handle.

The invention has the beneficial effects that:

the guiding tube can guide the guide wire to the measured point, and the operator is not required to keep holding the guiding tube all the time, so that the rest work can be carried out, the physical strength is saved, misoperation is not easy to occur, and the detection efficiency is improved. Meanwhile, the detection head and the interior of the engine are protected, damage is prevented, and detection cost is saved.

Drawings

The above and other features, nature, and advantages of the present invention will become more apparent from the following description of the embodiments and the accompanying drawings in which like reference characters refer to the same parts throughout the drawings, it being noted that the drawings are exemplary only, are not drawn to scale, and should not be taken as limiting the scope of the invention as it is actually claimed, wherein:

FIG. 1 is a schematic view of a guide structure according to one embodiment;

FIG. 2 is a schematic view of a first guide tube of an embodiment;

FIG. 3 isbase:Sub>A sectional view A-A of the first guide tube according to FIG. 2;

FIG. 4 is a schematic view of a second guide tube of an embodiment;

FIG. 5 is a top view of an embodiment of a second guide tube;

FIG. 6 is a sectional view B-B of a top view of the second guide tube according to FIG. 5;

FIG. 7 is a schematic view of a third guide tube of an embodiment;

FIG. 8 is a top view of an embodiment of a third guide tube;

FIG. 9 is a C-C sectional view of a top view of the third guide tube according to FIG. 8;

FIG. 10 is a schematic view of another orientation of a guide structure according to one embodiment;

FIG. 11 is a schematic view of an embodiment of a handle;

FIG. 12 is a schematic illustration of the steps of a method of bore inspection according to one embodiment;

FIG. 13 is a partial schematic view of one embodiment of a guide structure engaged with a casing;

FIG. 14 is a partial schematic view of an embodiment of a stator blade root inspection of a gas turbine engine;

FIG. 15 is a partial schematic view of an embodiment of a circumferential blade area inspection of a gas turbine engine;

FIG. 16 is a partial front view of an embodiment of a circumferential blade area inspection of a gas turbine engine;

FIG. 17 is a partial schematic view of an embodiment of a gas turbine engine rotor blade inspection;

FIG. 18 is a partial top view of an embodiment of a gas turbine engine rotor blade inspection.

Reference numerals:

1001-straight pipe part, 10011-fixed position, 1002-bent pipe part;

1-a first guide tube, 102-a bent tube part, 1020-a wave-shaped extension section, 1021-a wave crest and 1022-a wave trough;

2-a second guide tube, 202-a bent tube part, 2021-a second hook section, 2022-a straight tube section;

3-a third guide pipe, 302-a bent pipe part, 3021-a third hook section, 3022-a straight pipe section;

4-handle, 401-first blind hole, 402-second blind hole, 403-rectangular edge, 404-circular arc edge;

5-a casing, 501-a casing hole, 502-a flange face, 5021-a bolt;

6-area inside the rotor disk hub of a gas turbine engine, 601-first probing point, 602-next probing point;

7-circumferential blade area of the gas turbine engine, 701-first probing point, 702-next probing point;

8-rotor blades of the gas turbine engine in different stages, 801-first probing point, 802-next probing point.

Detailed Description

Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with the exemplary embodiments, it will be understood that this description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.

In the description that follows, references to "circumferential," "inner," "outer," "downstream," or other orientation terms indicate an orientation or positional relationship that is based on that shown in the drawings, merely for convenience in describing the invention and to simplify the description, and do not indicate or imply that the referenced device or component must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of the invention. Also, this application uses specific words to describe embodiments of this application. Reference to "one embodiment" or "an embodiment" means that a feature, structure, or characteristic described in connection with at least one embodiment of the application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some of the features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Referring to fig. 1, in one embodiment, a specific structure example of a guide structure of a hole detection guide wire may be a guide tube including a straight tube portion 1001 and a bent tube portion 1002. The bent pipe portion 1002 is connected to the straight pipe portion 1001 at a position downstream of the straight pipe portion 1001, and an axis a of the straight pipe portion 1001 is provided so as not to overlap with an extending direction b of an outlet end of the bent pipe portion 1002. In some embodiments, the diameter D of the guide tube is 6-7 mm, and the outer diameter D of the guide tube is 8-9 mm. The guiding tube can guide the guide wire to the measured point, and the operator is not required to keep holding the guiding tube all the time, so that the rest work can be carried out, the physical strength is saved, misoperation is not easy to occur, and the detection efficiency is improved. Meanwhile, the detection head and the interior of the engine are protected, damage is prevented, and detection cost is saved.

Referring to fig. 1 in conjunction with fig. 2, 4 and 7, in an embodiment, a specific structure example of the guiding structure of the hole detection guide line may be that a plane formed by an extending direction of the straight pipe portion 1001 and an extending direction of the bent pipe portion 1002 is defined as a first plane α, specifically, the first plane α is formed by intersecting an axis a of the straight pipe portion 1001 and an extending direction b of an outlet end of the bent pipe portion 1002, and the straight pipe portion 1001 has a fixing position 10011, so that the straight pipe portion 1001 is fixed to the casing at the fixing position 10011. The guide structure comprises a first guide tube 1 and/or a second guide tube 2 and/or a third guide tube 3.

Referring to fig. 2 in conjunction with fig. 3, specifically, an example of a specific structure of the first guide pipe 1 may be that a bending direction of the first guide pipe 1 is located on a plane β perpendicular to the first plane α. The bending pipe part 102 of the first guide pipe 1 is provided with a wave-shaped extension section 1020, the bending radius R2 of the wave crest 1021 of the wave-shaped extension section 1020 is 2-5 times of the outer diameter d of the first guide pipe 1, the bending radius R3 of the wave trough 1022 of the wave-shaped extension section 1020 is 2-5 times of the outer diameter d of the first guide pipe 1, and the bending angle f1 of the wave crest and the wave trough is 45-180 degrees.

Referring to fig. 4 in conjunction with fig. 6, specifically, an example of a specific structure of the second guide tube 2 may be that the bending direction of the second guide tube 2 is located on the first plane α, the bent tube portion 202 of the second guide tube 2 has a second hook section 2021, an included angle f2 between the tail end and the start end of the second hook section 2021 is 30 ° to 80 °, and the bending radius R4 of the second hook section 2021 is 2 to 5 times the outer diameter d of the second guide tube 2;

referring to fig. 7 in conjunction with fig. 9, in particular, an example of a specific structure of the third guide tube 3 may be that the bending direction of the third guide tube 3 is located on the first plane α, the bent tube portion 302 of the third guide tube 3 has a third hook section 3021, an included angle f3 between the tail end and the start end of the third hook section 3021 is 100 ° to 170 °, and the bending radius of the third hook section 3021 is 2 to 5 times the outer diameter d of the third guide tube 3.

The guide pipe that sets up three kinds of not isostructures can satisfy the guide of the guide line that carries out the hole inspection to the different regions of engine, and optional first guide pipe 1 cooperates the location when needing to detect multistage low pressure turbine blade's blade, and the root that needs to detect turbine stator blade can select for use second guide pipe 2 to cooperate the location, and optional third guide pipe 3 cooperates the location when needing to observe the blade region of engine circumference.

Referring to fig. 6 and 9, in one embodiment, an example of a specific structure of the second guide pipe 2 may also be that the bent pipe portion 202 of the second guide pipe 2 includes a straight pipe section 2022, and an included angle g between the straight pipe section 2022 and the straight pipe portion 201 of the second guide pipe 2 is 45 ° to 180 °; as an example of the specific structure of the third guide pipe 3, the bent pipe portion 302 of the third guide pipe 3 may include a straight pipe section 3022, and the included angle e between the straight pipe section 3022 and the straight pipe portion 301 of the third guide pipe 3 is 45 ° to 180 °. The contained angle of bending tube portion and straight tube portion can make the better engine internals of avoiding of guiding tube, prevents to damage, prevents to introduce unnecessary impurity, reduces extra cost of maintenance.

Referring to fig. 10, in one embodiment, an example of a specific structure of the guide tube may be that the fixing position 10011 further includes a handle 4, the handle 4 is fixedly connected to the straight tube portion 1001, and the handle 4 and the straight tube portion 1001 define a locating plane γ, specifically, an axis a of the straight tube portion intersects with a center line x of the handle 4 to form the locating plane γ. As shown in fig. 10 in conjunction with fig. 2, the first plane α of the first guide tube 1 coincides with the positioning plane γ. As shown in fig. 10 in combination with fig. 5, the first plane α of the second guide tube 2 forms an angle c of 0 to 90 ° with the positioning plane γ. As shown in fig. 10 in combination with fig. 8, the angle h between the first plane α of the third guide tube 3 and the positioning plane γ is 0 to 90 °. The angles of the first plane alpha and the positioning plane gamma of the three guide tubes are set to be different, so that the requirements of the three guide tubes on different positions of the hole exploration inspection can be better met, excessive manual operation judgment of operators is not needed, and the guide tubes can be placed in the exploration positions without collision.

Referring to fig. 11, in one embodiment, the handle 4 may have a first blind hole 401 and a second blind hole 402 on two sides, respectively, and the two sides are asymmetric, and one side is a rectangular side 403, the other side is an arc side 404, and the diameter of the arc side 404 is R1. The width W of the handle 4 is greater than the diameter of the barrel bore to prevent it from falling into the engine. The blind hole and the asymmetrical structure of the handle are beneficial to identifying the direction of the guide tube by reference so as to identify the position of the outlet. In addition, aiming at different types of catheters, for example, the first guide tube 1, the second guide tube 2 and the third guide tube 3, the marks can be marked on the handle, so that the identification error is prevented, the manual judgment of an operator is not needed, the probing point can be quickly and accurately positioned, and the abrasion and the collision do not occur.

In another embodiment, the material of the guide tube is thermoplastic material with good thermoplasticity, and the three-dimensional structure of the guide tube can be adjusted to form after being heated at 70-120 ℃. Under effective protection "gauge wire/guide wire" and prevent to bump the prerequisite of grinding with the inside spare part of engine, can be according to actual conditions, through the three-dimensional structure of the mode adjustment guide tube that preheats, make the guide tube can match more and explore the position, the utilization ratio is higher.

Referring to fig. 12, in one embodiment, a specific example of steps of a method for performing a borescope inspection using the guide structure as described above may include the following:

step A, selecting a second guide pipe of a guide structure for the inspection position of the root of a stator blade of a gas turbine engine or the inner side area of a rotor disc hub; selecting a first guide pipe of a guide structure for checking the end surface area of a rotor blade of a gas turbine engine at a checking position or needing to check the end surface area of the rotor in a cross-stage mode after a hole is detected through a far hole; selecting a third guide pipe of the guide structure for a blade area with the inspection position in the circumferential direction of the gas turbine engine;

b, extending a guide pipe from a detection hole of the casing until the guide pipe is fixed with the casing, wherein the guide pipe does not collide with components in the casing;

and C, extending the guide wire of the hole detector and the detecting head into the guide tube until the detecting head reaches the inspection position.

In an optional embodiment, the specific step example of the step B may further include heating the guide tube made of a thermoplastic material if the guide tube collides with the component inside the casing, and adjusting the structure of the bent tube portion of the guide tube until the guide tube does not collide with the component inside the casing, so as to prevent introduction of the excess.

In another alternative embodiment, the specific example of step B may further include extending a guide tube into the bore of the casing, identifying the direction of the guide tube through a blind hole, a rectangular edge, and a circular arc edge of the handle, and adjusting the handle to align the guide structure with the inspection position.

Referring to fig. 13, in another embodiment, a casing hole 501 is formed in the casing 5, a flange surface 502 is disposed on the casing hole 501, the flange surface 502 is square, and the casing 5 is fixedly connected to four corners by bolts 5021. The handle 4 is matched with the flange surface 502, and the direction of the guide tube is more accurately identified through the positions of the blind holes 401 and 402, the rectangular edge 403 and the circular arc edge 404 of the handle 4 relative to the flange surface 502, so that the guide tube can be referred to determine the checking position. When the hole inspection is not required, the flange surface 502 is in a blocked state.

In particular, as in the example shown in fig. 14, the second guide duct 2 is selected to inspect the inner region 6 of the hub of a rotor disk of a gas turbine engine. Firstly, the second guide pipe 2 is extended into the casing 5 from one layer or a plurality of layers of casing holes 501 of the casing 5, the handle 4 is adjusted to enable the positioning plane gamma to be vertical to the axis i of the engine, the second guide pipe 2 is arranged in a correct position, and the second guide pipe 2 is fixed after the first exploration point 601 is positioned. The guide wire of the bore probe and the probing tip are then extended into the second guide tube 2 until the probing tip reaches the examination position. After the inspection of the first inspection point 601 is completed, the guide wire is pulled back to make the probe head be located inside the second guide tube 2, the adjusting handle 4 positions the next inspection point 602 through the rectangular edge, the circular arc edge and the blind hole on the adjusting handle relative to the flange surface, and after the second guide tube 2 is positioned and fixed, the probe head is extended out of the second guide tube 2 to reach the inspection position. Repeating the steps until all the detection points are checked, retracting the guide wire to enable the detection head to be arranged outside the second guide pipe 2, and then moving the second guide pipe 2 out of the casing 5. And no collision is caused in the whole process, and redundant impurities are prevented from being introduced into the engine.

In the example shown in fig. 15 in combination with fig. 6, the third guide duct 3 is selected for inspecting the circumferential vane region 7 of the gas turbine engine, on which the fine structure features can be inspected. Firstly, a third guide pipe 3 is extended into the casing 5 from one layer or a plurality of layers of casing holes of the casing 5, a handle 4 is adjusted to enable a positioning plane gamma to be vertical to the axis i of the engine, the third guide pipe 3 is arranged in a correct position, and the third guide pipe 3 is fixed after the first exploration point 701 is positioned. The guide wire of the bore finder and the probing tip are then extended into the third guide tube 3 until the probing tip reaches the inspection position. After the inspection of the first probing point 701 is completed, the guide wire is pulled back to enable the probing head to be located inside the third guide tube 3, the adjusting handle 4 positions the next probing point 702 through the rectangular edge 403, the arc edge 404 and the blind holes 401 and 402 on the adjusting handle relative to the flange surface 502, and the probing head extends out of the third guide tube 3 to reach the inspection position after the positioning of the next probing point 702 and the fixing of the third guide tube 3. Repeating the steps until all the detection points are checked, retracting the guide wire to enable the detection head to be arranged outside the third guide pipe 3, and then moving the third guide pipe 3 out of the casing 5. And no collision is caused in the whole process, and redundant impurities are prevented from being introduced into the engine.

As an example shown in fig. 17 in connection with 18, the first guide duct 1 is selected for inspection of different numbers of rotor blades 8 of a gas turbine engine. Firstly, a first guide pipe 1 is extended into a casing 5 from one layer or multiple layers of casing holes of the casing 5, a handle 4 is adjusted to enable a positioning plane gamma to be parallel to an engine axis i, the first guide pipe 1 is straightened, a first-stage rotor blade 801 of a first exploration point is positioned, and then the first guide pipe 1 is fixed. The guide wire of the bore probe and the probing tip are then extended into the first guide tube 1 until the probing tip reaches the examination position. After the inspection of the first probing point 801 is completed, the guide wire is pulled back to enable the probing head to be located inside the first guide tube 1, the adjusting handle 4 positions the next probing point through the rectangular edge 403, the arc edge 404 and the blind holes 401 and 402 on the adjusting handle relative to the flange surface 502, the first guide tube 1 is fixed and then the probing head is extended out of the first guide tube 1 to reach the inspection position. Repeating the steps until all the detection points are checked, retracting the guide wire to enable the detection head to be arranged outside the first guide pipe 1, and then moving the first guide pipe 1 out of the casing 5. And no collision is caused in the whole process, and redundant impurities are prevented from being introduced into the engine. For the rotor blade of inspection nth level, the extension length of the bent pipe portion of the first guide pipe 1 selected for use is the first length, and for the rotor blade of inspection (N + 1) th level, the extension length of the bent pipe portion of the first guide pipe 1 selected for use is the second length, and the second length is greater than the first length.

In summary, the guiding structure of the hole detection guide line and the hole detection method described in the above embodiments include, but are not limited to, one or a combination of the following:

1. the guiding tube can guide the guide wire to the measured point, and the operator is not required to keep holding the guiding tube all the time, so that the rest work can be carried out, the physical strength is saved, misoperation is not easy to occur, and the detection efficiency is improved. Meanwhile, the detection head and the interior of the engine are protected, damage is prevented, and detection cost is saved.

2. The guide tube that sets up three kinds of not isostructures can satisfy the guide of the guide wire that carries out the hole inspection to the different regions of engine, and the optional first guide tube that uses carries out the cooperation location when needing to detect multistage low pressure turbine blade's blade body, and the root that needs to detect turbine stator blade can select for use the second guide tube to carry out the cooperation location, and the optional third guide tube cooperation location that uses when needing to observe the blade region of engine circumference.

3. The contained angle of bending tube portion and straight tube portion can make the better engine internals of avoiding of guiding tube, prevents to damage, prevents to introduce unnecessary impurity, reduces extra cost of maintenance.

4. The handle sets up blind hole and asymmetric structure and helps discerning the direction of guiding tube, need not the manual judgement of operating personnel, can fix a position the exploration point fast and accurately and do not take place to grind and bump.

5. The guiding tube has fine thermoplasticity, adjusts the three-dimensional structure of guiding tube through the mode of preheating, makes the guiding tube can match more and explore the position, and the utilization ratio is higher.

6. The method for detecting the hole by using the guide structure is efficient and convenient, and the collision between the detection head and the internal parts of the engine can be avoided.

Although the present invention has been disclosed in terms of the preferred embodiments, it is not intended to limit the invention, and variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention are within the protection scope defined by the claims of the present invention, unless the technical spirit of the present invention departs from the content of the technical solution of the present invention.

Claims (10)

1. A guide structure of a foramen probe guide wire, comprising a guide tube, the guide tube comprising:

a straight tube portion; and

bending the pipe part;

the bending pipe part is located at the downstream of the straight pipe part and connected with the straight pipe part, and the axis of the straight pipe part and the extending direction of the outlet end of the bending pipe part are arranged in a non-overlapping mode.

2. The guide structure according to claim 1, wherein a plane defining an extending direction of the straight tube portion and an extending direction of the bent tube portion is a first plane, the straight tube portion having a fixing position such that the straight tube portion is fixed with a casing at the fixing position; the guide structure includes:

the bending direction of the first guide pipe is positioned on a plane vertical to the first plane; the bent pipe part of the first guide pipe is provided with a wave-shaped extension section, the bending radius of the wave crest and the wave trough of the wave-shaped extension section is 2-5 times of the outer diameter of the guide pipe, and the bending angle of the wave crest and the wave trough is 45-170 degrees; and/or

The bending direction of the second guide pipe is located on the first plane, the bent pipe part of the second guide pipe is provided with a second hook section, the included angle between the tail end and the starting end of the second hook section is 30-80 degrees, and the bending radius of the second hook section is 2-5 times of the outer diameter of the guide pipe;

and/or

The bending direction of the third guide pipe is located on the first plane, the bent pipe part of the third guide pipe is provided with a third hook section, the included angle between the tail end and the starting end of the third hook section is 100-170 degrees, and the bending radius of the third hook section is 2-5 times of the outer diameter of the guide pipe.

3. The guide structure of claim 2, wherein the bent tube portion of the second guide tube comprises a straight tube section that is angled from the straight tube portion of the second guide tube by an angle of 45 ° -180 °; the bent pipe part of the third guide pipe comprises a straight pipe section, and the included angle between the straight pipe section and the straight pipe part of the third guide pipe is 45-180 degrees.

4. The guide structure of claim 2, wherein the fixed position further comprises a handle fixedly connected to the straight tube portion, the handle and the straight tube portion defining a positioning plane, the first plane of the first guide tube coinciding with the positioning plane, the first plane of the second guide tube forming an angle of 0-90 ° with the positioning plane, and the first plane of the third guide tube forming an angle of 0-90 ° with the positioning plane.

5. The guide structure of claim 4, wherein the handle is a bilateral asymmetric structure having a first blind hole, a second blind hole, a rectangular edge, and a circular edge on each side.

6. The guide structure of claim 1, wherein the material of the guide tube is a thermoplastic material.

7. A method of borescope comprising using the guide structure of any of claims 2-6, the method comprising:

step A, selecting a second guide pipe of the guide structure for an area with an inspection position of the root of a stator blade of a gas turbine engine or the inner side of a rotor disc hub; selecting a first guide pipe of the guide structure for the inspection position of a rotor blade of a gas turbine engine or the end surface area of a rotor needing to be inspected in a cross-stage mode after a far hole is drilled; selecting a third guide pipe of the guide structure for a blade area with the inspection position in the circumferential direction of the gas turbine engine;

b, extending the guide pipe from the exploratory hole of the casing until the guide pipe is fixed with the casing, wherein the guide pipe does not collide with components in the casing;

and C, extending the guide wire of the hole detector and the detecting head into the guide tube until the detecting head reaches the inspection position.

8. The bore inspection method according to claim 7, wherein in the step a, the first guide pipe of the guide structure is selected for inspection of turbine rotor blades of gas turbine engines having different stages, the bent pipe portion of the first guide pipe is selected to have a first length for inspection of the nth stage rotor blade, and the bent pipe portion of the first guide pipe is selected to have a second length greater than the first length for inspection of the N +1 th stage rotor blade.

9. The borescope inspection method according to claim 7, wherein the guide tube is made of a thermoplastic material, and in the step B, if the guide tube collides with the component inside the casing, the guide tube is heated, and the structure of the bent tube portion is adjusted until the guide tube does not collide with the component inside the casing.

10. The borescope inspection method of claim 7, wherein the guide structure further comprises a handle, the handle and the straight pipe portion define a locating plane, the first plane of the first guide pipe coincides with the locating plane, the first plane of the second guide pipe forms an angle of 0 ° to 90 ° with the locating plane, the first plane of the third guide pipe forms an angle of 0 ° to 90 ° with the locating plane, and in step B, the guide pipe is extended from the slot of the casing, and the guide structure is adjusted by adjusting the position of the handle.

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