An in-situ ultrasonic testing tool for the root slot of a gas turbine compressor impeller

Abstract

The present invention discloses an in-situ ultrasonic detection tooling for the root slot of a gas turbine compressor impeller, which includes a left clamping arm, a right clamping arm, a sliding guide rail, a guiding device and an L-shaped bracket; the left clamping arm and the right clamping arm are arranged oppositely, and both are fixedly connected to the sliding guide rail through a guide rail groove in an engaged manner. Telescopic devices are provided in the middle of the left clamping arm and the right clamping arm, and a left clamping arm fixing claw and a right clamping arm fixing claw are respectively provided at the ends of the left clamping arm and the right clamping arm; the guiding device is engaged on the sliding guide rail through the guide rail groove, and the L-shaped bracket includes an L-shaped bracket vertical arm and an L-shaped bracket horizontal arm; the lower end of the guiding device is connected to the upper end of the L-shaped bracket vertical arm; a spring is sleeved on the L-shaped bracket vertical arm, and a probe clamping device is sleeved on the L-shaped bracket horizontal arm through a bracket groove. The present invention enables the detection tooling to be stably fixed and the ultrasonic probe to be stably coupled, and at the same time enables the ultrasonic probe to accurately scan and be accurately positioned, realizing efficient and reliable in-situ detection of cracks in the root slot of the compressor impeller.

Description

Technical Field

[0001] The invention belongs to the field of ultrasonic testing, and in particular relates to an in-situ ultrasonic testing tool for a gas turbine compressor impeller blade root groove. Background Art

[0002] The compressor moving blades are the main components of the compressor that do work on the gas turbine inlet gas. As a rotating machine, it needs to withstand the combined effects of centrifugal stress, airflow impact force, vibration stress and other loads during operation. The compressor moving blades and the compressor rotor are matched through the compressor impeller blade root groove. As the key to transmitting the compressor rotor torque to the compressor moving blades, the compressor impeller blade root groove not only bears the same or greater load, but also has a more severe working environment due to corrosion, fretting wear, etc., so the inspection of the health status of the compressor impeller blade root groove is particularly important to ensure the safe and stable operation of the gas turbine.

[0003] During the start-up and shutdown process of the gas turbine, the stress at the acute angles at the front and rear ends of the compressor impeller blade root groove is the greatest. After a certain number of start-up and shutdown cycles, cracks may appear at the acute angles at the bottom of the compressor impeller blade root groove. Cracks generally extend in two directions, one is to extend radially along the front and rear surfaces of the rim toward the center of the compressor rotor, and the other is to extend forward or backward along the length direction of the blade root groove.

[0004] At present, the main nondestructive testing technology for gas turbine compressor impeller blade root slot cracks is phased array ultrasonic testing technology. On-site testing is often carried out without disassembling the compressor blades. In order to make the detection tooling more stable, the ultrasonic probe coupling more stable, and at the same time realize accurate scanning and accurate positioning of the ultrasonic probe, it is of great significance to design and process a tooling that can be clamped on the blade to realize in-situ efficient and reliable detection of compressor impeller blade root slot cracks. Summary of the invention

[0005] In order to solve the problem of accurate scanning of ultrasonic probes in the prior art, the present invention provides an in-situ ultrasonic detection tooling for the blade root groove of a gas turbine compressor impeller, so as to stably fix the detection tooling and stably couple the ultrasonic probe, and at the same time enable the ultrasonic probe to accurately scan and position, thereby realizing efficient and reliable in-situ detection of cracks in the blade root groove of the compressor impeller.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] An in-situ ultrasonic detection tool for a gas turbine compressor impeller blade root groove, comprising a left clamping arm, a right clamping arm, a sliding guide rail, a guide device and an L-shaped bracket;

[0008] The left clamping arm and the right clamping arm are arranged oppositely, and are both fixedly connected to the sliding guide rail through engagement with the guide rail groove. Telescopic devices are provided in the middle of both the left clamping arm and the right clamping arm, and a left clamping arm fixing claw and a right clamping arm fixing claw are respectively provided at the end parts of the left clamping arm and the right clamping arm;

[0009] The guiding device is engaged on the sliding guide rail through the guide rail groove. The L-shaped bracket includes a vertical arm of the L-shaped bracket and a vertical arm of the L-shaped bracket;

[0010] The lower end of the guiding device is connected to the upper end of the vertical arm of the L-shaped bracket; a spring is sleeved on the vertical arm of the L-shaped bracket, and a probe clamping device is sleeved on the horizontal arm of the L-shaped bracket through a bracket groove.

[0011] A further improvement of the present invention is that screw holes are formed on one side of the opposite ends of the left clamping arm fixing claw and the right clamping arm fixing claw, and a rubber layer is added on the other side.

[0012] A further improvement of the present invention is that both the left clamping arm and the right clamping arm are composed of two sections, and the two ends are connected by a telescopic device.

[0013] A further improvement of the present invention is that a second screw hole is formed on the side surface of the telescopic device, and its length is adjusted by a locking screw installed in the second screw hole.

[0014] A further improvement of the present invention is that the cross section of the sliding guide rail is circular, and guide rail grooves are formed on both sides of the sliding guide rail.

[0015] A further improvement of the present invention is that a vertical through hole is provided on the guiding device, and the vertical arm of the L-shaped bracket is inserted into the through hole for fixation; a retaining ring is provided at the upper end of the vertical arm of the L-shaped bracket exposed on the upper surface of the guiding device, and a compressed spring is installed at the lower part of the guiding device.

[0016] A further improvement of the present invention is that the probe clamping device includes a probe clamping device connecting rod; bracket grooves matched with the probe clamping device connecting rod are provided on both sides of the horizontal arm of the L-shaped bracket.

[0017] A further improvement of the present invention is that a first scale line with a minimum graduation of 9° is engraved on the surface of the probe clamping device connecting rod close to the probe clamping device along the circumferential direction.

[0018] A further improvement of the present invention is that a convex cylinder and a screw hole are provided on the inner surface of one side of the probe clamping device; the probe clamping device can rotate around the probe clamping device connecting rod.

[0019] A further improvement of the present invention is that a second scale line with a minimum graduation of 10° is engraved on the upper surface of the probe clamping device; a third scale line with a minimum graduation of 1 mm is engraved on the sliding guide rail and the horizontal arm of the L-shaped bracket.

[0020] The present invention has the following beneficial technical effects:

[0021] The present invention fixes the detection tooling on the compressor blade, and through the relatively arranged left clamping arm and right clamping arm, the fixation of the ultrasonic detection tooling for the root groove of the compressor impeller is more stable in the state where the blade is not disassembled; a spring is used to press the ultrasonic probe tightly on the surface of the compressor impeller to enable stable coupling and scanning of the ultrasonic probe; the distance range during the scanning of the ultrasonic probe is determined through the distance and angle measurement functions of the detection tooling, providing a basis for the formulation of the detection process; through the accurate measurement of the position and swing angle of the ultrasonic probe, the precise quantification of the crack size is achieved. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of an in-situ ultrasonic detection tooling for the root groove of a gas turbine compressor impeller according to the present invention;

[0023] Figure 2 It is a partial view of an in-situ ultrasonic detection tooling for the root groove of a gas turbine compressor impeller according to the present invention Figure 1 ;

[0024] Figure 3 It is a partial view of an in-situ ultrasonic detection tooling for the root groove of a gas turbine compressor impeller according to the present invention Figure 2 ;

[0025] Figure 4 It is the scale on the sliding guide rail and the horizontal arm of the L-shaped bracket of an in-situ ultrasonic detection tooling for the root groove of a gas turbine compressor impeller according to the present invention;

[0026] Figure 5 It is the angle scale of the probe clamping device and the connecting rod of the probe clamping device of an in-situ ultrasonic detection tooling for the root groove of a gas turbine compressor impeller according to the present invention.

[0027] Description of the Reference Numerals:

[0028] 1 - Left clamping arm, 2 - Sliding guide rail, 3 - Bolt, 4 - Right clamping arm, 5 - Telescopic device, 6 - Guide rail groove, 7 - Left clamping arm fixing claw, 8 - Right clamping arm fixing claw, 9 - Locking nut, 10 - Guide device, 11 - Vertical arm of the L-shaped bracket, 12 - Spring, 13 - Horizontal arm of the L-shaped bracket, 14 - Bracket groove, 15 - Probe clamping device, 16 - Screw hole of the left / right clamping arm fixing claw, 17 - Rubber layer of the left / right clamping arm fixing claw, 18 - Through hole, 19 - Retaining ring, 20 - Connecting rod of the probe clamping device, 21 - Scale line of the connecting rod, 22 - Inner surface cylinder of the probe clamping device, 23 - Screw hole of the probe clamping device, 24 - Scale line on the upper surface of the probe clamping device, 25 - Scale line of the sliding guide rail and the horizontal arm of the L-shaped bracket. Detailed Embodiment

[0029] In order to make the objectives and technical solutions of the present invention clearer and easier to understand, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0032] Refer to Figures 1 to 5 , an in-situ ultrasonic detection tooling for the root slot of a gas turbine compressor impeller provided by the present invention includes a left clamping arm 1, a sliding guide rail 2, a bolt 3, a right clamping arm 4, a telescopic device 5, a guide rail groove 6, a left clamping arm fixing claw 7, a right clamping arm fixing claw 8, a locking nut 9, a guiding device 10, a vertical arm 11 of an L-shaped bracket, a spring 12, a horizontal arm 13 of the L-shaped bracket, a bracket groove 14, and a probe clamping device 15.

[0033] Among them, the left clamping arm 1 is connected to the sliding guide rail 2 by bolts 3. Telescopic devices 5 are provided in the middle of both the left clamping arm 1 and the right clamping arm 4, and they are fixedly engaged with the sliding guide rail 2 through guide rail grooves 6. Left clamping arm fixing claws 7 and right clamping arm fixing claws 8 are respectively provided at the connections between the left clamping arm 1 and the right clamping arm 4 and the blade edge. The sliding guide rail 2 and the right clamping arm 4 are matched by a locking nut 9. The guiding device 10 is engaged on the sliding guide rail 2 through the guide rail groove 6. A spring 12 is sleeved on the vertical arm 11 of the L-shaped bracket, and a probe clamping device 15 is sleeved on the horizontal arm 13 of the L-shaped bracket through a bracket groove 14.

[0034] The probe clamping device 15 includes a probe clamping device connecting rod 20 and the probe clamping device 15. The probe clamping device 15 is installed at the lower part of the probe clamping device connecting rod 20 and can rotate around it.

[0035] The principle of the present invention is as follows: Fix the detection tooling on the compressor blade to make the fixation of the ultrasonic detection tooling for the root groove of the compressor impeller more stable without disassembling the blade; Use a spring to press the ultrasonic probe tightly on the surface of the compressor impeller to enable stable coupling and scanning of the ultrasonic probe; Determine the distance range during the scanning of the ultrasonic probe through the distance and angle measurement functions of the detection tooling, providing a basis for formulating the detection process; Achieve precise quantification of the crack size through accurate measurement of the position and swing angle of the ultrasonic probe.

[0036] Preferably, the cross-sectional shape of the left clamping arm 1 is rectangular, with a vertical side length of 10 mm and a horizontal side length of 10 mm.

[0037] One side of the left clamping arm fixing claw 7 and the right clamping arm fixing claw 8 is provided with a first screw hole 16, and a rubber layer 17 is added on one side.

[0038] Preferably, the cross-sectional shape of the right clamping arm 4 is rectangular, with side lengths of 10 mm each.

[0039] The left clamping arm 1 and the right clamping arm 4 are composed of two sections and are connected together by a telescopic device 5.

[0040] The telescopic device 5 is provided with screw holes on its side, and the lengths of the left clamping arm 1 and the right clamping arm 4 are fixed by screwing.

[0041] Preferably, the cross-section of the sliding guide rail 2 is circular, with a diameter of 10 mm, and guide rail grooves 6 are provided on both the left and right sides.

[0042] The guiding device 10 is processed with a vertical through hole 18, and its cross-sectional shape is rectangular, which is matched with the vertical arm 11 of the L-shaped bracket.

[0043] The cross-section of the vertical arm 11 of the L-shaped bracket is rectangular, with side lengths of 5 mm each. A retaining ring 19 is provided at the upper end of the vertical arm 11 of the L-shaped bracket that exposes the upper surface of the guiding device 10, and a spring 12 is installed at the lower part of the guiding device 10.

[0044] Preferably, the cross-section of the horizontal arm 13 of the L-shaped bracket is rectangular, with side lengths of 5 mm each, and bracket grooves 14 are provided on both sides for mating with the connecting rod 20 of the probe clamping device.

[0045] The cross-section of the connecting rod 20 of the probe clamping device is circular, and 9 scale lines 21 with a minimum graduation of 9° are engraved on the surface near the probe clamping device 15 along the circumferential direction.

[0046] On one side of the inner surface of the probe clamping device 15, there is a protruding cylinder 22, and on one side, there is a third screw hole 23.

[0047] The probe clamping device 15 can rotate around the connecting rod 20 of the probe clamping device, and 36 scale lines 24 with a minimum graduation of 10° are engraved on the upper surface.

[0048] Preferably, scale lines 25 with a minimum graduation of 1 mm are engraved on the sliding guide 2 and the horizontal arm 13 of the L-shaped bracket.

[0049] Reference Figures 1 to 5 , the working principle of the present invention will be further described:

[0050] Fix the ultrasonic probe on the probe clamping device 15 through the screw hole 22. Before the detection starts, fix the detection tooling on the compressor blade through the left clamping arm 1 and the right clamping arm 4 to ensure that the force of the spring pressing down at this time can ensure that the probe is stably coupled to the upper surface of the root groove of the compressor impeller. During the detection process, determine the scanning position and range of the probe through the scale lines 25 on the sliding guide 2 and the horizontal arm 13 of the L-shaped bracket, and determine the swinging angle of the probe through the scale lines 21 and the scale lines 24.

[0051] When quantifying the crack size of the root groove of the compressor impeller, move the ultrasonic probe back and forth to find the highest wave of the crack, record the position of the probe at this time, scan the ultrasonic probe along the direction perpendicular to the length of the probe, keep the swinging angle of the ultrasonic probe unchanged, and find the positions of the probe when the echo amplitude decreases by 6 dB respectively. At this time, the crack length

[0052] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. An in-situ ultrasonic detection tooling for the root slot of a gas turbine compressor impeller, characterized in that, it includes a left clamping arm (1), a right clamping arm (4), a sliding guide rail (2), a guiding device (10) and an L-shaped bracket; The left clamping arm (1) and the right clamping arm (4) are arranged oppositely, and both are fixedly connected to the sliding guide rail (2) through a guide rail groove (6) in an engaged manner. Telescopic devices (5) are provided in the middle of the left clamping arm (1) and the right clamping arm (4), and a left clamping arm fixing claw (7) and a right clamping arm fixing claw (8) are respectively provided at the ends of the left clamping arm (1) and the right clamping arm (4); The guiding device (10) is engaged on the sliding guide rail (2) through the guide rail groove (6). The L-shaped bracket includes an L-shaped bracket vertical arm (11) and a spring (12); The lower end of the guiding device (10) is connected to the upper end of the L-shaped bracket vertical arm (11); A compressed spring (12) is sleeved on the L-shaped bracket vertical arm (11), and a probe clamping device (15) is sleeved on the L-shaped bracket horizontal arm (13) through a bracket groove (14); On the surface of the probe clamping device connecting rod (20) close to the probe clamping device (15), a first scale line (21) with a minimum scale of 9° is engraved along the circumferential direction; On the upper surface of the probe clamping device (15), a second scale line (24) with a minimum scale of 10° is engraved; On the sliding guide rail (2) and the L-shaped bracket horizontal arm (13), a third scale line (25) with a minimum scale of 1 mm is engraved.

2. The in-situ ultrasonic detection tooling for the root slot of a gas turbine compressor impeller according to claim 1, characterized in that, On one side of the opposite ends of the left clamping arm fixing claw (7) and the right clamping arm fixing claw (8), screw holes are opened, and a rubber layer (17) is added on the other side.

3. The in-situ ultrasonic detection tooling for the root slot of a gas turbine compressor impeller according to claim 1, characterized in that, Both the left clamping arm (1) and the right clamping arm (4) are composed of two sections, and the two sections are connected by a telescopic device (5).

4. The in-situ ultrasonic detection tooling for the root slot of a gas turbine compressor impeller according to claim 1, characterized in that, On the side of the telescopic device (5), a screw hole is opened, and its length is adjusted by a locking screw installed in the screw hole.

5. The in-situ ultrasonic detection tooling for a gas turbine compressor impeller according to claim 1, characterized in that, The cross-section of the sliding guide rail (2) is circular, and guide rail grooves (6) are opened on both sides of the sliding guide rail (2).

6. The in-situ ultrasonic detection tooling for the root slot of a gas turbine compressor impeller according to claim 1, characterized in that, A vertical through hole (18) is provided on the guiding device (10), and the L-shaped bracket vertical arm (11) is inserted into the through hole (18) for fixation; A retaining ring (19) is provided at the upper end of the L-shaped bracket vertical arm (11) exposed on the upper surface of the guiding device (10), and a compressed spring (12) is installed at the lower part of the guiding device (10).

7. The in-situ ultrasonic detection tooling for the root slot of a gas turbine compressor impeller according to claim 1, characterized in that, The probe clamping device (15) includes a probe clamping device connecting rod (20); on both sides of the horizontal arm (13) of the L-shaped bracket, there are bracket grooves that cooperate with the probe clamping device connecting rod (20).

8. An in-situ ultrasonic testing tooling for the root slot of a gas turbine compressor impeller according to claim 7, characterized in that, on one inner surface of the probe clamping device (15), there is a protruding cylinder (22), and on one side, there is a screw hole; the probe clamping device (15) can rotate around the probe clamping device connecting rod (20).

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