CN113607820B - Turbine rotor crack propagation in-situ detection system under extreme working condition - Google Patents
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- 238000001514 detection method Methods 0.000 title claims abstract description 55
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 32
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 100
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 100
- 239000011734 sodium Substances 0.000 claims abstract description 100
- 239000000523 sample Substances 0.000 claims abstract description 69
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 238000001816 cooling Methods 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000012360 testing method Methods 0.000 claims abstract description 29
- 238000005057 refrigeration Methods 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 10
- 238000005485 electric heating Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 235000012431 wafers Nutrition 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000002826 coolant Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 230000003044 adaptive effect Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides a turbine rotor crack propagation in-situ detection system under extreme working conditions, which is used for a rotor subsystem comprising a wheel disc, a switching disc, a mandrel and the like, and comprises a detection subsystem and a refrigeration subsystem; the probe of the detection subsystem extends into the circulation seat and is propped against the rotor after being uniformly arranged along the radial direction, and the computer is connected with the probe to perform in-situ detection and display on crack growth change data of the rotor; a loop sodium cooling mechanism of the refrigeration subsystem is positioned in the cavity, so that the probe part is accommodated in the flow hole of the flow seat and is cooled by sodium liquid; the secondary circuit water cooling mechanism penetrates through the cavity, water is stored in the secondary circuit water cooling mechanism, and sodium liquid in the primary circuit sodium cooling mechanism is naturally cooled through the water. By implementing the invention, the problems that the existing in-place detection probe cannot bear high temperature and vacuum is kept in a refrigerating and high-speed rotating state are solved, so that the turbine rotor test environment is closer to the engine state, and the assessment is more true.
Description
Technical Field
The invention relates to the technical field of turbine rotor detection, in particular to a turbine rotor crack propagation in-situ detection system under extreme working conditions.
Background
The turbine rotor runs under extreme working conditions, the rotating speed reaches tens of thousands to hundreds of thousands of revolutions per minute, the temperature reaches 300 to 1600 ℃, and the safety requirement is high. Meanwhile, internal defects such as inclusions, micro holes and the like are easy to cause fatigue damage of the turbine rotor, and the safety and the reliability of the aeroengine are seriously threatened. Fatigue testing of high-speed rotation test systems is a mature and effective method for assessing the safety and reliability of turbine rotors. Based on the test, the research on the fatigue crack growth rule of the turbine rotor can be carried out.
At present, research on fatigue crack propagation rules of turbine rotors is based on displacement nondestructive detection such as a ray method, an ultrasonic method and the like, or on-site detection methods such as a vibration/displacement/strain detection method, an acoustic emission method and the like. However, the above method has the following problems: the displacement nondestructive detection such as a ray method, an ultrasonic method and the like is suitable for nondestructive detection under the condition of shutdown; when the turbine rotor is stopped, the cracks are closed, and the characteristics of weak detection signals and difficult identification are achieved; the displacement detection mode needs to dismantle the tool, the test progress is seriously influenced, the workload is high, the test period is long, and cracks cannot be found in the detection process before the wheel disc breaks; the nondestructive testing probes such as acoustic emission and ultrasonic are not resistant to high temperature, and the performance of the turbine rotor under normal temperature examination is greatly different from the performance of the turbine rotor under the high temperature of the engine; under high-speed rotation, the high-speed rotation test system has large noise, and the in-situ detection methods such as a vibration/displacement/strain detection method, an acoustic emission method and the like have long signal transmission paths and poor detection effects.
Therefore, a system for detecting crack propagation in-situ of a turbine rotor under extreme working conditions is needed, the requirements of a high-temperature test environment and a high vacuum degree in the turbine rotor are met, the system has the characteristics of good refrigeration effect, high safety and wide adaptive temperature range, and the problems that an existing in-situ detection probe cannot bear high temperature and vacuum maintenance in a refrigeration and high-speed rotation state are solved, so that the turbine rotor test environment is more similar to an engine state, and assessment is more true.
Disclosure of Invention
The invention aims to solve the technical problems of providing an in-situ detection system for crack propagation of a turbine rotor under extreme working conditions, which meets the requirements of a high-temperature test environment and a high vacuum degree in the turbine rotor, has the characteristics of good refrigeration effect, high safety and wide adaptive temperature range, and solves the problems that the existing in-situ detection probe cannot bear high temperature and is in vacuum maintenance under refrigeration and high-speed rotation states, so that the test environment of the turbine rotor is more similar to the engine state, and the assessment is more true.
In order to solve the technical problems, the embodiment of the invention provides a turbine rotor crack propagation in-situ detection system under extreme working conditions, which is used for a rotor subsystem comprising a rotor, a switching disc, a mandrel, a cavity, a tray, an insulating layer and an electric heating wire, and comprises a detection subsystem and a refrigeration subsystem;
the detection subsystem comprises a probe and a computer connected with the probe through a signal line; wherein,
the probes extend into the circulation seat and are propped against the rotor after being uniformly distributed along the radial direction, and are used for ultrasonic testing to sense crack expansion change data of the rotor in real time; the computer is positioned outside the cavity and used for carrying out in-situ detection and display on crack growth change data induced to the rotor;
the refrigeration subsystem comprises a primary circuit sodium cooling mechanism and a secondary circuit water cooling mechanism; wherein,
the first-loop sodium cooling mechanism is positioned in the cavity and comprises a sodium liquid pool, a flow seat, a valve, a sodium pipe and a first-loop pump; the sodium liquid pool is used for storing sodium liquid, and the top end of the sodium liquid pool is communicated with the circulation seat and is communicated into a circulation loop through the sodium pipe; one end of the circulation seat, which is far away from the sodium liquid pool, is close to the rotor and is provided with a sealing installation part for installing the probe, so that one part of the installed probe is accommodated in a circulation hole of the circulation seat and is cooled by sodium liquid, and the other part of the installed probe extends into the circulation seat to prop against the rotor; the valve is arranged at the bottom end of the sodium liquid pool and is used for controlling the inlet and outlet of external sodium liquid; the first loop pump is arranged on the sodium pipe and used for driving sodium liquid to circulate in the sodium pipe, the sodium liquid pool and the circulation seat;
the secondary circuit water cooling mechanism penetrates through the cavity and comprises a heat exchanger positioned in the cavity, a secondary circuit pump positioned outside the cavity and a water pipe penetrating through the cavity; the heat exchanger is arranged on a sodium pipe of the primary circuit sodium cooling mechanism and is close to the mandrel, the outer wall of the heat exchanger is in contact with the outer wall of the sodium pipe, water is stored in the heat exchanger and is communicated into another circulation circuit through the water pipe, and the heat exchanger is used for naturally cooling sodium liquid flowing in the sodium pipe through the circulating water; the two-loop pump is arranged on the water pipe and positioned outside the cavity and used for driving water to circulate in the water pipe and the heat exchanger.
Wherein the detection subsystem further comprises a high-speed slip ring positioned outside the cavity; wherein,
the high-speed sliding ring is arranged at the top of the mandrel, the moving ring of the high-speed sliding ring is connected with the probe through a signal wire, and the static ring is connected with the computer through another signal wire and is used for transmitting ultrasonic test data of the probe in a rotating state.
The high-speed slip ring is CX-24-20000RPM type high-speed slip ring electric guide, and the number of slip ring channels is 24.
Wherein, the first-circuit sodium-cooled mechanism also comprises a heat insulation sleeve; wherein,
the heat insulation sleeve is arranged on the inner wall of the circulation seat, and forms a whole with the circulation seat through interference and locking plates.
The upper half part of the circulation seat is an annular groove, the inner ring and the outer ring of the circulation seat are respectively fixed on the adapter plate, 360-degree sodium liquid receiving can be realized, the inner side of the outer ring is inwards inclined, and the sodium liquid can move downwards under the compression of centrifugal force.
The sealing installation part is positioned at the lower half part of the circulation seat and comprises a wedge block and a sealing ring; wherein,
the wedge block is fastened on a through hole formed in the circulation seat towards the rotor through the sealing ring, and can drive the probe to freely slide in the radial direction;
the heat insulation sleeve is placed in the through hole formed in the circulation seat.
The wedge block is made of medium-high temperature resistant materials.
The probe is made of medium and low temperature resistant materials, and is one of a resonant narrowband acoustic emission probe with a passband frequency of 150KHz, a phased array full focusing probe, a linear array phased array full focusing probe with a frequency of more than 5MHz and 64 wafers and high-speed rotation resistance, and an area array phased array full focusing probe with a frequency of more than 5MHz and 64 wafers and high-speed rotation resistance.
Wherein, the number of the probes is two, and the probes are symmetrically distributed.
The embodiment of the invention has the following beneficial effects:
according to the invention, the first-circuit sodium cooling mechanism is used for cooling the probe by using sodium liquid as a coolant, so that the probe for detecting the crack propagation in the turbine rotor in-situ under extreme working conditions is cooled, the cooling effect is high, the higher vacuum requirement can be ensured, and meanwhile, the second-circuit water cooling mechanism is used for cooling the sodium liquid in the first-circuit sodium cooling mechanism, so that the whole cycle of the first-circuit sodium cooling mechanism is closed, and the safety problem is solved. Therefore, the high-temperature test environment and the high vacuum degree requirement in the turbine rotor are met, the high-temperature test device has the characteristics of good refrigerating effect, high safety and wide adaptive temperature range, and solves the problems that the existing in-situ detection probe cannot bear high temperature and can not be maintained in vacuum in the refrigerating and high-speed rotating states, so that the turbine rotor test environment is more similar to the engine state, and the examination is more true.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
FIG. 1 is a schematic diagram of a connection structure of a turbine rotor crack propagation in-situ detection system under extreme conditions provided by an embodiment of the present invention;
FIG. 2 is a block diagram of the system of FIG. 1;
FIG. 3 is an enlarged view of a portion of the point A of FIG. 1;
FIG. 4 is a flow chart of the cooling mode of FIG. 1;
the heat exchanger comprises a probe 1, a heat insulation sleeve 2, a mandrel 3, a flow seat 4, a switching disc 5, a rotor 6, a sodium liquid pool 7, a valve 8, a sodium pipe 9, a primary loop pump 10, a tray 11, a heat insulation layer 12, a heating wire 13, a cavity 15, a computer 16, a high-speed slip ring 17, a water pipe 18, a secondary loop pump 19, a wedge block 20, a sealing ring 21, a signal line and a heat exchanger 22.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1 to fig. 4, in an embodiment of the present invention, a turbine rotor crack propagation in-situ detection system under an extreme working condition is provided, which is used for a rotor subsystem including a rotor 6, an adapter disk 5, a mandrel 3, a cavity 14, a tray 11, an insulating layer 12 and an electric heating wire 13; the rotor 6 is fastened by a locking nut, forms a whole with the adapter plate 5 and the mandrel 3 and is positioned in the cavity 14; the heating wire 13 is laid on the heat preservation layer 12, and the rotor 6, the switching disc 5 and the mandrel 3 are wrapped in the heat preservation layer 12 and are arranged on the cavity 14 through the tray 11;
at this time, the turbine rotor crack propagation in-situ detection system under the extreme working condition comprises a detection subsystem and a refrigeration subsystem, and specifically comprises:
the detection subsystem comprises a probe 1 and a computer 15 connected with the probe through a signal line 21; wherein,
the probe 1 extends into the circulation seat 14 and is propped against the rotor 6 after being uniformly arranged along the radial direction, and is used for ultrasonic testing of crack expansion change data of the real-time induction rotor 6; the computer 15 is positioned outside the cavity 14 and is used for performing in-situ detection and display on crack growth change data induced to the rotor 6;
the refrigeration subsystem comprises a primary circuit sodium cooling mechanism and a secondary circuit water cooling mechanism; wherein,
a loop sodium cooling mechanism is positioned in the cavity 14 and comprises a sodium liquid pool 7, a flow seat 4, a valve 8, a sodium pipe 9 and a loop pump 10; the sodium liquid pool 7 stores sodium liquid, and the top end of the sodium liquid pool is communicated with the circulation seat 4 and is communicated into a circulation loop through a sodium pipe 9; one end of the circulation seat 4 far away from the sodium liquid pool 7 is close to the rotor 6 and is provided with a sealing installation part for installing the probe 1, so that one part of the installed probe 1 is accommodated in a circulation hole in the circulation seat 4 and is cooled by sodium liquid, and the other part of the installed probe is stretched out of the circulation seat 4 to lean against the rotor 6; the valve 8 is arranged at the bottom end of the sodium liquid pool 7 and is used for controlling the inlet and outlet of external sodium liquid; a loop pump 10 is arranged on the sodium tube 9 and is used for driving sodium liquid to circulate in the sodium tube 9, the sodium liquid pool 7 and the circulation seat 4 so as to quickly drive the sodium liquid to circulate to cool down and cool down the probe 1;
the secondary circuit water cooling mechanism penetrates through the cavity 14 and comprises a heat exchanger 22 positioned in the cavity 14, a secondary circuit pump 18 positioned outside the cavity 14 and a water pipe 17 penetrating through the cavity 14; the heat exchanger 22 is arranged on the sodium tube 9 of the sodium cooling mechanism of the first circuit and is close to the mandrel 3, the outer wall of the heat exchanger is contacted with the outer wall of the sodium tube 9, water is stored in the heat exchanger and is communicated into another circulation circuit through the water tube 17, and the heat exchanger is used for naturally cooling sodium liquid flowing in the sodium tube 9 through the circulating water; the two-loop pump 18 is arranged on the water pipe 17 and is positioned outside the cavity 14 and used for driving water to circulate in the water pipe 17 and the heat exchanger 22 so as to realize rapid driving water circulation to accelerate natural cooling of sodium liquid in the sodium pipe 9 under the condition that the one-loop sodium cooling mechanism is closed.
It should be noted that the coolant in the primary sodium-cooled mechanism is not limited to sodium liquid, but may be other liquid coolants. Similarly, the coolant in the two-circuit sodium-cooled mechanism is not limited to water, but may be other liquid coolants. The flow-through seat 4 is always not in contact with the rotor 6 and the clearance is less than 0.5mm. One end of the signal wire 21 passes through the central through hole of the mandrel 3 and is fixed on the adapter plate 5 in a welding mode, and the other end is connected with the computer 15.
It can be understood that the probe 1 is cooled by using sodium liquid as a coolant through the primary circuit sodium cooling mechanism, so that the probe 1 for in-situ detection of the crack propagation in the turbine rotor under extreme working conditions is cooled, the cooling effect is high, the higher vacuum requirement can be ensured, and meanwhile, the secondary circuit water cooling mechanism is used for cooling sodium liquid in the primary circuit sodium cooling mechanism, so that the whole circulation of the primary circuit sodium cooling mechanism is closed, and the safety problem is solved.
In an embodiment of the invention, the detection subsystem further comprises a high-speed slip ring 16 located outside the cavity 14; the high-speed slip ring 16 is installed at the top of the mandrel 3, the slip ring is connected with the probe 1 through a signal line 21, and the stationary ring is connected with the computer 15 through another signal line 21 for transmitting ultrasonic test data of the probe 1 in a rotating state. In one embodiment, the high-speed slip ring 16 is a CX-24-20000RPM type high-speed slip ring primer having 24 slip ring channels.
In the embodiment of the invention, the primary sodium-cooling mechanism also comprises a heat insulation sleeve 2; the heat insulation sleeve 2 is arranged on the inner wall of the flow hole of the flow seat 4, and forms a whole with the flow seat 4 through interference and locking plates.
The upper half part of the circulation seat 4 is an annular groove, the inner ring and the outer ring of the circulation seat are respectively fixed on the adapter plate 5, 360-degree sodium liquid receiving can be realized, the inner side of the outer ring is inwards inclined, and the sodium liquid can move downwards under the compression of centrifugal force.
The lower half part of the circulation seat 4 is provided with a sealing installation part which comprises a wedge 19 and a sealing ring 20; the wedge 19 is fastened on a through hole (not shown) formed in the circulation seat 4 towards the rotor 6 through a sealing ring 20, and can drive the probe 1 to freely slide radially; at this time, the heat insulating jacket 2 is placed in the through hole formed in the circulation seat 4. Thus, the probe 1 fastened to the wedge 19 by the lock nut wets in the flow-through hole of the flow-through seat 4 and, when the probe 1 slides radially, causes the wedge 19 and the rotor 6 to come into close contact.
In one embodiment, the wedge 19 is made of medium and high temperature resistant materials; the probe 1 is made of medium and low temperature resistant materials, and is one of a resonant narrowband acoustic emission probe with a passband frequency of 150KHz, a phased array full focusing probe, a linear array phased array full focusing probe with a frequency of more than 5MHz and 64 wafers resistant to high-speed rotation and an area array phased array full focusing probe with a frequency of more than 5MHz and 64 wafers resistant to high-speed rotation;
in another embodiment, the two probes 1 are symmetrically distributed and distributed in the corresponding circulation seats 4, and can work normally at the temperature of 250 ℃ and below.
The working principle of the turbine rotor crack propagation in-situ detection system under the extreme working condition in the embodiment of the invention is as follows:
(1) Before the test, determining the maximum defect of the dangerous part and taking the maximum defect as an in-situ detection part;
(2) Mounting refrigerating components such as the probe 1, the wedge 19 and the like;
(3) Vacuumizing the cavity 14;
(4) The electric heating wire 13 is adjusted to a primary temperature control state, and the temperature of the rotor 6 on the turbine disk is heated to 250 ℃ for heat preservation;
(5) Opening a valve 8 and a loop pump 10, and inputting sodium liquid at 250 ℃ into a sodium pipe 9;
(6) Closing valve 8 when one circuit is full of sodium solution, and maintaining one circuit pump 10 to operate and enable one circuit to be at 250 ℃;
(7) The electric heating wire 13 is gradually adjusted to a secondary temperature control state, and meanwhile, the secondary loop pump 18 is turned on, so that the rotor 6 on the turbine disc is at the test temperature, and the primary loops are all at 200-250 ℃;
(8) The detection system is started, and signals are collected in real time through the probe 1;
(9) The rotor 6 accelerates to a test rotational speed;
(10) When the test is completed, the rotor 6 is decelerated to zero;
(11) Closing a detection system;
(12) The electric heating wire 13 is adjusted to a primary temperature control state, the secondary loop pump 18 is gradually closed, and the temperature of the rotor 6 and the primary loop on the turbine disk is kept at 200-250 ℃;
(13) Opening a valve 8 to extract all sodium liquid in a loop;
(14) Closing the heating wire 13;
(15) Closing the vacuum;
(16) And removing the in-situ detection system component, and ending the test.
By adopting the refrigeration method, the problems of internal defects of the turbine rotor and the identification of the internal defects under extreme working conditions are solved, the influence on the test progress is reduced by adopting an in-situ detection mode, the workload is reduced greatly, the encryption test detection period is further reached, and the development of the defects is efficiently resolved.
The embodiment of the invention has the following beneficial effects:
according to the invention, the first-circuit sodium cooling mechanism is used for cooling the probe by using sodium liquid as a coolant, so that the probe for detecting the crack propagation in the turbine rotor in-situ under extreme working conditions is cooled, the cooling effect is high, the higher vacuum requirement can be ensured, and meanwhile, the second-circuit water cooling mechanism is used for cooling the sodium liquid in the first-circuit sodium cooling mechanism, so that the whole cycle of the first-circuit sodium cooling mechanism is closed, and the safety problem is solved. Therefore, the high-temperature test environment and the high vacuum degree requirement in the turbine rotor are met, the high-temperature test device has the characteristics of good refrigerating effect, high safety and wide adaptive temperature range, and solves the problems that the existing in-situ detection probe cannot bear high temperature and can not be maintained in vacuum in the refrigerating and high-speed rotating states, so that the turbine rotor test environment is more similar to the engine state, and the examination is more true.
The above disclosure is only a preferred embodiment of the present invention, and it is needless to say that the scope of the invention is not limited thereto, and therefore, the equivalent changes according to the claims of the present invention still fall within the scope of the present invention.
Claims (6)
1. The turbine rotor crack propagation in-situ detection system under the extreme working condition is used for a rotor subsystem comprising a wheel disc (6), an adapter disc (5), a mandrel (3), a cavity (14), a tray (11), an insulating layer (12) and an electric heating wire (13), and is characterized by comprising a detection subsystem and a refrigeration subsystem;
the detection subsystem comprises a probe (1) and a computer (15) connected with the probe through a signal line (21); wherein,
the probe (1) stretches into the circulation seat (4) and is propped against the wheel disc (6) after being uniformly arranged along the radial direction, and the probe is used for sensing crack expansion change data of the wheel disc (6) in real time in an ultrasonic test; the computer (15) is positioned outside the cavity (14) and is used for performing in-situ detection and display on crack growth change data induced to the wheel disc (6);
the refrigeration subsystem comprises a primary circuit sodium cooling mechanism and a secondary circuit water cooling mechanism; wherein,
the first-loop sodium cooling mechanism is positioned in the cavity (14) and comprises a sodium liquid pool (7), a circulation seat (4), a valve (8), a sodium pipe (9) and a loop pump (10); the sodium liquid pool (7) stores sodium liquid, and the top end of the sodium liquid pool is communicated with the circulation seat (4) and is communicated into a circulation loop through the sodium pipe (9); one end of the circulation seat (4) far away from the sodium liquid pool (7) is close to the wheel disc (6) and is provided with a sealing installation part for installing the probe (1), so that one part of the installed probe (1) is accommodated in a circulation hole of the circulation seat (4) and cooled by sodium liquid, and the other part of the installed probe extends into the circulation seat (4) to lean against the wheel disc (6); the valve (8) is arranged at the bottom end of the sodium liquid pool (7) and is used for controlling the inlet and outlet of external sodium liquid; the primary loop pump (10) is arranged on the sodium pipe (9) and is used for driving sodium liquid to circulate in the sodium pipe (9), the sodium liquid pool (7) and the circulation seat (4);
the two-circuit water cooling mechanism penetrates through the cavity (14) and comprises a heat exchanger (22) positioned in the cavity (14), a two-circuit pump (18) positioned outside the cavity (14) and a water pipe (17) penetrating through the cavity (14); the heat exchanger (22) is arranged on a sodium pipe (9) of the primary circuit sodium cooling mechanism and is close to the mandrel (3), the outer wall of the heat exchanger is in contact with the outer wall of the sodium pipe (9), water is stored in the heat exchanger and is communicated into another circulation circuit through the water pipe (17), and the heat exchanger is used for naturally cooling sodium liquid flowing in the sodium pipe (9) through circulating water; the two-loop pump (18) is arranged on the water pipe (17) and positioned outside the cavity (14) and is used for driving water to circulate in the water pipe (17) and the heat exchanger (22);
the primary circuit sodium cooling mechanism also comprises a heat insulation sleeve (2); wherein,
the heat insulation sleeve (2) is arranged on the inner wall of the circulation groove of the circulation seat (4) and forms a whole with the circulation seat (4) through interference and locking plates;
the upper half part of the circulation seat (4) is an annular groove, the inner ring and the outer ring of the circulation seat are respectively fixed on the switching disc (5), 360-degree sodium liquid receiving can be realized, the inner side of the outer ring is inwards inclined, and the sodium liquid can move downwards under the compression of centrifugal force;
the sealing installation part is positioned at the lower half part of the circulation seat (4) and comprises a wedge block (19) and a sealing ring (20); wherein,
the wedge block (19) is fastened on a through hole formed in the circulation seat (4) towards the wheel disc (6) through the sealing ring (20), and can drive the probe (1) to freely slide in the radial direction;
the heat insulation sleeve (2) is arranged in a through hole formed in the circulation seat (4).
2. The turbine rotor crack propagation in-situ detection system under extreme conditions of claim 1, wherein the detection subsystem further comprises a high-speed slip ring (16) located outside the cavity (14); wherein,
the high-speed slip ring (16) is arranged at the top of the mandrel (3), the moving ring of the high-speed slip ring is connected with the probe (1) through a signal line (21), and the stationary ring is connected with the computer (15) through another signal line (21) and is used for transmitting ultrasonic test data of the probe (1) in a rotating state.
3. The turbine rotor crack propagation in-situ detection system under extreme working conditions as claimed in claim 2, wherein the high-speed slip ring (16) is a CX-24-20000RPM high-speed slip ring primer, and the number of slip ring channels is 24.
4. The turbine rotor crack propagation in-situ detection system under extreme conditions as claimed in claim 1, wherein said wedge (19) is made of a medium and high temperature resistant material.
5. The in-situ detection system for crack propagation of a turbine rotor under extreme working conditions as claimed in claim 1, wherein the probe (1) is made of medium and low temperature resistant materials and is one of a resonant narrowband acoustic emission probe with a passband frequency of 150KHz, a phased array full focusing probe, a linear array phased array full focusing probe with a frequency of more than 5MHz and 64 wafers and high speed rotation resistance, and an area array phased array full focusing probe with a frequency of more than 5MHz and 64 wafers and high speed rotation resistance.
6. The turbine rotor crack propagation in-situ detection system under the extreme working condition according to claim 5, wherein the number of the probes (1) is two, and the probes are symmetrically distributed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110915379.9A CN113607820B (en) | 2021-08-10 | 2021-08-10 | Turbine rotor crack propagation in-situ detection system under extreme working condition |
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| CN202110915379.9A CN113607820B (en) | 2021-08-10 | 2021-08-10 | Turbine rotor crack propagation in-situ detection system under extreme working condition |
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| CN113607820B true CN113607820B (en) | 2024-03-19 |
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Citations (13)
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