CN214473003U - Serial probe for ultrasonic inspection of heat transfer tubes of steam generator and heat exchanger - Google Patents
Serial probe for ultrasonic inspection of heat transfer tubes of steam generator and heat exchanger Download PDFInfo
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- CN214473003U CN214473003U CN202023272817.4U CN202023272817U CN214473003U CN 214473003 U CN214473003 U CN 214473003U CN 202023272817 U CN202023272817 U CN 202023272817U CN 214473003 U CN214473003 U CN 214473003U
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Abstract
The utility model particularly relates to a steam generator and heat exchanger heat-transfer pipe ultrasonic inspection's tandem probe, including joint, cable, metal circle shelves head and tandem probe, the joint is connected with supersound appearance, basin and cable respectively, the cable is connected with tandem probe, metal circle shelves head is connected with the tandem probe front end. The utility model discloses a steam generator and heat exchanger heat-transfer pipe ultrasonic inspection's serial probe adopts tandem ultrasonic technology, can cover circumference with a plurality of probes and sweep the scope of looking into to improve inspection speed greatly, with conventional ultrasonic technology, have can inspect the sensitivity height, the advantage of all kinds of defects of distinguishable.
Description
Technical Field
The utility model relates to a nondestructive test technical field especially relates to a steam generator and heat exchanger heat-transfer pipe ultrasonic inspection's serial probe.
Background
Steam generators and heat exchangers, in which thousands of fine heat transfer tubes are distributed with a small gap on a tube sheet, are key devices of power plants, and heat transfer tubes are key components. When the heat transfer pipe works, the inner part of the heat transfer pipe exchanges heat between high-temperature and high-pressure primary side water and external secondary side water through the heat transfer pipe, and meanwhile, the heat transfer pipe also plays a role in isolating radioactivity. In order to ensure the safe operation of the whole power system, the steam generator and the heat transfer pipe of the heat exchanger need to be periodically checked. In the operation process of the steam generator and the heat transfer pipe of the heat exchanger, the steam generator and the heat transfer pipe of the heat exchanger are subjected to the effects of high temperature, high pressure, alternating load and the like, so that the defects of circumferential and axial cracks, corrosion, pitting corrosion and the like are easily generated, and the pipe diameter and the wall thickness are changed. The diameter of the heat transfer pipe of the steam generator and the heat exchanger is small (the inner diameter is about 10mm), the pipe wall is thin (less than 3mm), the inspection range is long (not less than 10m), the heat transfer pipe is sealed in the steam generator and the heat exchanger, the inspection space is limited, and the mainstream detection methods for the heat transfer pipe of the steam generator and the heat exchanger in China at present mainly comprise eddy current, rotary ultrasound and the like, but all the methods have various defects and limitations.
The eddy current detection technology has the fastest detection speed, but has larger detection error on ferromagnetic materials, is easy to be influenced by material and shape change, has lower detection level on cracks with complex shapes, and has inaccurate defect qualification and quantification. The expand tube transition zone pipe diameter and the wall thickness that the heat-transfer pipe is connected with the tube sheet constantly change, and there is the difference in these two kinds of base member materials of heat-transfer pipe and tube sheet, and its precision can't be guaranteed to electric current when adopting eddy current detection, can cause the difficulty to eddy current detection. The eddy current inspection depends on the professional skill of a technician, and the research of the American electric power research institute finds that other electromagnetic inspection methods are needed for ferromagnetic pipes due to different users of eddy current equipment and different damage recognition rates, and a far-field eddy current inspection (RFT) method is generally adopted, but the detection speed is low, the detection precision is low, and the detection is highly dependent on the professional skill of the technician. The rotary ultrasonic inspection technology has high precision and is not influenced by the material and shape change of the heat transfer pipe, but the inspection speed is slow, only the speed of several millimeters per second is needed, the long-distance whole pipe inspection consumes long time, and the rotary ultrasonic inspection technology is not suitable for large-scale heat transfer pipe engineering application.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a tandem probe for ultrasonic inspection of heat transfer tubes of a steam generator and a heat exchanger, which addresses the problems of eddy current inspection technology and rotational ultrasonic inspection technology of heat transfer tubes of steam generators and heat exchangers. Compared with eddy current detection technology and rotary ultrasonic detection technology, the tandem probe can quickly and efficiently find axial cracks, circumferential cracks, corrosion and changes of pipe wall thickness in the heat transfer pipe.
In order to achieve the above object, the present invention provides the following technical solutions:
a tandem probe for ultrasonic inspection of a heat transfer pipe of a steam generator and a heat exchanger comprises a joint, a cable, a metal round baffle head and a tandem probe, wherein the joint is respectively connected with an ultrasonic instrument, a water tank and the cable, the cable is connected with the tandem probe, and the metal round baffle head is connected with the front end of the tandem probe.
The working principle is as follows: will the utility model discloses a steam generator and heat exchanger heat-transfer pipe ultrasonic inspection's serial probe is applied to steam generator and heat exchanger heat-transfer pipe ultrasonic inspection, and steam generator and heat exchanger heat-transfer pipe ultrasonic inspection's serial probe gets into the heat-transfer pipe through the heat-transfer pipe mouth of pipe inside. After reaching the designated position, the cable is pulled to drive the serial probe to move along the axial direction of the heat transfer pipe pipeline, and the ultrasonic instrument controls the serial probe to cover 360-degree circumferential scanning, so that complete-range scanning is formed, and the sound beam enters the heat transfer pipe through the coupling water to obtain an ultrasonic echo signal. The ultrasonic instrument converts the received ultrasonic echo signals into digital signals and transmits the digital signals back to the acquisition workstation, the digital signals are displayed in A, B, C, D scanning four modes through ultrasonic acquisition software and are provided for data analysts to carry out signal analysis to judge whether the heat transfer pipe has defects and the qualitative and quantitative characteristics of the defects; if the defects exist, different sound beams can be further excited by a tandem focusing principle, so that the quantitative accuracy is improved.
Furthermore, the joint is connected with a water tank through a joint water pipe, and the water tank is connected with a water pump; the connector is connected with the ultrasonic instrument through a multi-core cable connector.
Further, the joint is an ultrasonic joint.
Furthermore, the cable is a combined cable and comprises a metal shielding net, a multi-core coaxial cable and a single-core water pipe; and a multi-core coaxial cable and a single-core water pipe are sequentially and circumferentially arranged in the metal shielding net from outside to inside.
Further, the tandem probe is a tandem axial oblique probe or a tandem circumferential oblique probe.
Furthermore, the serial axial oblique probe consists of two groups of independent piezoelectric wafers distributed in an annular 360-degree manner, each group of independent piezoelectric wafers is provided with two independent piezoelectric wafers, the length direction of each piezoelectric wafer forms a certain angle with the heat transfer pipe, and the annular array surfaces of the piezoelectric wafers are concentric with the heat transfer pipe; and the thickness of the water layer of the serial axial oblique probe ensures that the three reflected waves of the serial axial oblique probe are all positioned between the first water interfacial wave and the second water interfacial wave.
Further, a refraction angle of the serial axial direction inclined probe is β, and an incident angle θ of the serial axial direction inclined probe in water, that is, an inclined angle of the mounting hole, is calculated by the following formula: an incident angle θ ═ arcsin (CW sin β/CS), where: CW represents the sound velocity in water, and CS represents the velocity of the oblique radio wave in the heat transfer tube.
Furthermore, the serial circumferential oblique probe consists of two groups of independent piezoelectric wafers distributed in an annular 360-degree mode, and each group of independent piezoelectric wafers is provided with two independent piezoelectric wafers; the length direction of the piezoelectric wafer and the heat transfer pipe are arranged eccentrically to each other; the annular array surface of the piezoelectric wafer is concentric with the heat transfer pipe; the thickness of the water layer of the serial circumferential inclined probe ensures that secondary reflection waves of the serial circumferential inclined probe are all positioned between the first water interface wave and the second water interface wave.
Further, the refraction angle β of the tandem circumferential inclined probe is 90 degrees; the center of the serial circumferential direction oblique probe mounting hole is deviated from the center of the heat transfer pipe, and the distance of the center of the serial circumferential direction oblique probe mounting hole from the center of the heat transfer pipe is calculated according to the following formula: eccentricity X ═ sin θ R, where: theta represents an incident angle in water, and R represents an inner diameter of the heat transfer pipe.
Furthermore, the metal round stopper head is connected with the front end of the serial probe through threads.
Furthermore, the metal round stopper is provided with double petals, the double petals are flexible double-centering petal structures made of hard plastics, and the outer diameters of the flexible double-centering petal structures are matched with the inner diameter of the heat transfer pipe.
Furthermore, a flexible ring is arranged on the metal round stopper, the flexible ring is made of rubber, and the outer diameter of the flexible ring is matched with the inner diameter of the heat transfer pipe.
The utility model has the advantages of:
the utility model discloses a steam generator and heat exchanger heat-transfer pipe ultrasonic inspection's serial probe adopts tandem ultrasonic technology, can cover circumference with a plurality of probes and sweep the scope of looking into to improve inspection speed greatly, compare with conventional ultrasonic technology, it is high to have ability inspection sensitivity, the advantage of all kinds of defects of distinguishable, performance parameter satisfies the requirement of heat-transfer pipe ultrasonic inspection, can discover the axial crackle in the heat-transfer pipe, circumference crackle, corruption and the change of pipe wall thickness, be applicable to the inspection of the small defect of heat-transfer pipe very much.
Drawings
Fig. 1 is a schematic structural view of a serial probe for ultrasonic inspection of heat transfer tubes of a steam generator and a heat exchanger according to the present invention;
FIG. 2 is a schematic structural view of a tandem axial tilt probe according to the present invention;
FIG. 3 is a schematic structural view of a tandem peripheral direction angle probe according to the present invention;
FIG. 4 is a schematic diagram illustrating calculation of the underwater incident angle of the tandem axial tilt probe according to the present invention;
FIG. 5 is a schematic diagram illustrating the calculation of the underwater incident angle and eccentricity of the serial circumferential angle probe of the present invention;
fig. 6 is a schematic view of the cable structure of the present invention.
In the figure: 1. a joint; 2. a cable; 3; a tandem probe; 4. double petals; 5. a flexible ring; 6. a metal round stopper; 7. a heat transfer tube; 8. a multi-core coaxial cable; 9. single core water pipe.
Detailed Description
In the description of the embodiments of the present invention, it should be understood that the terms "front end", "rear end", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The utility model provides a steam generator and heat exchanger heat-transfer pipe ultrasonic inspection's tandem probe, including joint 1, cable 2, metal circle shelves head 6 and tandem probe 3, joint 1 is connected with supersound appearance, basin and cable 2 respectively, cable 2 is connected with tandem probe 3, metal circle shelves head 6 is connected with tandem probe 3 front ends.
The working principle is as follows: will the utility model discloses a steam generator and heat exchanger heat-transfer pipe ultrasonic inspection's serial probe is applied to steam generator and 7 ultrasonic inspection of heat exchanger heat-transfer pipe, and steam generator and heat exchanger heat-transfer pipe ultrasonic inspection's serial probe gets into inside the heat-transfer pipe 7 through the 7 mouths of pipe of heat-transfer pipe. After reaching the designated position, the cable 2 is pulled to drive the serial probe 3 to move along the axial direction of the heat transfer pipe 7, and the serial probe 3 is controlled by the ultrasonic instrument to cover 360-degree circumferential scanning, so that complete-range scanning is formed, and an acoustic beam enters the heat transfer pipe 7 through coupling water to obtain an ultrasonic echo signal. The ultrasonic instrument converts the received ultrasonic echo signals into digital signals and transmits the digital signals back to the acquisition workstation, the digital signals are displayed in A, B, C, D scanning four modes through ultrasonic acquisition software and are provided for data analysts to carry out signal analysis to judge whether the heat transfer pipe 7 has defects and the qualitative and quantitative characteristics of the defects; if the defects exist, different sound beams can be further excited by a tandem focusing principle, so that the quantitative accuracy is improved.
Further, the joint 1 is connected with a water tank through a joint water pipe, and the water tank is connected with a water pump; the connector 1 is connected with the ultrasonic instrument through a multi-core cable connector.
Further, the joint 1 is an ultrasonic joint.
Further, the cable 2 is a combined cable, and comprises a metal shielding net, a multi-core coaxial cable 8 and a single-core water pipe 9; and a multi-core coaxial cable 8 and a single-core water pipe 9 are sequentially and circumferentially arranged in the metal shielding net from outside to inside.
Further, the tandem probe 3 is a tandem axial tilt probe or a tandem circumferential tilt probe.
Further, the serial axial oblique probe is composed of two groups of independent piezoelectric wafers distributed in an annular 360-degree mode, each group of independent piezoelectric wafers is provided with two independent piezoelectric wafers, the length direction of each piezoelectric wafer forms a certain angle with the heat transfer pipe 7, and the annular array surface of each piezoelectric wafer is concentric with the heat transfer pipe 7; and the thickness of the water layer of the serial axial oblique probe ensures that the three reflected waves of the serial axial oblique probe are all positioned between the first water interfacial wave and the second water interfacial wave.
Further, a refraction angle of the serial axial direction inclined probe is β, and an incident angle θ of the serial axial direction inclined probe in water, that is, an inclined angle of the mounting hole, is calculated by the following formula: an incident angle θ ═ arcsin (CW sin β/CS), where: CW denotes the sound velocity in water, and CS denotes the velocity of the oblique radio wave in the heat transfer pipe 7.
Furthermore, the serial circumferential oblique probe consists of two groups of independent piezoelectric wafers distributed in an annular 360-degree mode, and each group of independent piezoelectric wafers is provided with two independent piezoelectric wafers; the length direction of the piezoelectric wafer and the heat transfer pipe 7 are arranged eccentrically; the annular array surface of the piezoelectric wafer is concentric with the heat transfer pipe 7; the thickness of the water layer of the serial circumferential inclined probe ensures that secondary reflection waves of the serial circumferential inclined probe are all positioned between the first water interface wave and the second water interface wave.
Further, the refraction angle β of the tandem circumferential inclined probe is 90 degrees; the center of the serial circumferential direction angled probe mounting hole is offset from the center of the heat transfer pipe 7, and the distance that the center of the serial circumferential direction angled probe mounting hole is offset from the center of the heat transfer pipe 7 is calculated according to the following formula: eccentricity X ═ sin θ R, where: θ represents the underwater incident angle, and R represents the inner diameter of the heat transfer pipe 7.
Further, the metal round stopper 6 is connected with the front end of the serial probe 3 through a thread.
Furthermore, the metal round stopper 6 is provided with double petals 4, the double petals 4 are flexible double-centering petal structures made of hard plastics, and the outer diameters of the flexible double-centering petal structures are matched with the inner diameter of the heat transfer pipe 7.
Further, a flexible ring 5 is mounted on the metal round stopper 6, the flexible ring 5 is made of rubber, and the outer diameter of the flexible ring 5 is matched with the inner diameter of the heat transfer pipe 7.
The following describes embodiments of the present invention in further detail with reference to the drawings and examples.
Example 1
A tandem probe for ultrasonic inspection of heat transfer tubes of a steam generator and a heat exchanger comprises a connector 1, a cable 2, a tandem probe 3 and a metal round baffle head 6, wherein the connector 1 is respectively connected with an ultrasonic instrument, a water tank and the cable 2, the cable 2 is connected with the tandem probe 3, and the metal round baffle head 6 is connected with the front end of the tandem probe 3.
The joint 1 is an ultrasonic joint; the joint 1 is connected with a water tank through a joint water pipe, and the water tank is connected with a water pump; the connector 1 is connected with the ultrasonic instrument through a multi-core cable connector.
The cable 2 is a combined cable and comprises a metal shielding net, a coaxial cable 8 and a cable water pipe 9; an accommodating cavity along the circumferential direction of the inner wall of the metal shielding net is formed in the inner wall of the metal shielding net; coaxial cables 8 and cable water pipes 9 are sequentially and circumferentially arranged in the accommodating cavity from outside to inside.
The signals between the serial probe 3 and the ultrasonic instrument are transmitted through a multi-core coaxial cable 8. The coupling water pump in the water tank is sent to the single-core water pipe 9 by the water pump, the serial probe 3 is soaked in the coupling water of the single-core water pipe 9, the coupling water is recycled and pumped into the water tank by the water pump, and the coupling water is recycled. The cable 2 can simultaneously supply water and transmit signals, and the double-layer shielding can reduce noise interference caused by long-distance transmission. The cable 2 is also used for sending the tandem probe 3 to a specified position in the heat transfer pipe 7, and the tandem probe 3 is driven to move along the axial direction of the pipeline by pulling the cable 2.
The serial probe 3 is a serial axial oblique probe, the serial axial oblique probe is composed of two groups of independent piezoelectric wafers distributed in an annular 360-degree mode, and each group of independent piezoelectric wafers is provided with two independent piezoelectric wafers; the length direction of the piezoelectric wafer and the heat transfer pipe 7 form a certain angle; the piezoelectric wafer annular front is concentric with the heat transfer tube 7.
The ultrasonic control serial axial oblique probe excites the piezoelectric wafer to perform electronic deflection according to a certain time sequence in the circumferential direction, so that circumferential electronic scanning is formed; the serial axial inclined probe adopts 4 piezoelectric wafers distributed in an annular 360-degree mode so as to ensure that the electronic scanning range covers the circumferential full range of the heat transfer pipe; the serial axial oblique probe controls the sound beam to enter the heat transfer pipe 7 in a certain direction with the axis of the heat transfer pipe 7 through coupling water, and an ultrasonic echo signal is obtained.
The refraction angle of the serial axial oblique probe is beta, and the incident angle theta of the serial axial oblique probe in water, namely the inclination angle of the mounting hole, is calculated by the following formula: an incident angle θ ═ arcsin (CW sin β/CS), where: CW represents the sound velocity in water, and CS represents the velocity of the oblique radio wave in the heat transfer tube.
For water immersion ultrasonic inspection, the thickness of the water layer (the vertical distance from the tandem axial angle probe to the surface of the heat transfer tube 7) is an important design parameter. In order to avoid the influence of the water interface wave on the ultrasonic signal, the proper water layer thickness is designed, and the three reflected waves of the tandem axial inclined probe are ensured to be positioned between the first water interface wave and the second water interface wave.
The metal round gear head 6 is in threaded connection with the front end of the tandem axial oblique probe, and can be suitable for heat transfer tubes 7 of different specifications by replacing metal round gear heads 6 of different specifications.
The metal round stopper 6 is provided with double petals 4, the double petals 4 are flexible double-centering petal structures made of hard plastics, and the outer diameters of the flexible double-centering petal structures are matched with the inner diameter of the heat transfer pipe 7 (the outer diameters of the flexible double-centering petal structures are slightly larger than the inner diameter of the heat transfer pipe 7). The double petals 4 are used for keeping the tandem axial oblique probe concentric with the heat transfer pipe, so that the coupling underwater sound layer is kept stable in the movement process.
The metal round stopper 6 is provided with a flexible ring 5, the flexible ring 5 is made of rubber, and the outer diameter of the flexible ring 5 is matched with the inner diameter of the heat transfer pipe 7 (the outer diameter of the flexible ring 5 is slightly larger than the inner diameter of the heat transfer pipe 7). The flexible ring 5 is used for blocking coupling water, so that the coupling water cannot leak from the front end of the serial axial inclined probe, the water coupling is ensured to be stable, and meanwhile, the water pump can be recycled.
The serial probe for the ultrasonic inspection of the heat transfer tubes of the steam generator and the heat exchanger is applied to the ultrasonic inspection of the heat transfer tubes of the steam generator and the heat exchanger, and the serial probe for the ultrasonic inspection of the heat transfer tubes of the steam generator and the heat exchanger enters the heat transfer tubes 7 through the tube openings of the heat transfer tubes 7. After reaching the appointed position, pulling the cable 2 to drive the serial axial oblique probe to move along the axial direction of the pipeline, and simultaneously controlling the serial axial oblique probe through the ultrasonic instrument to form electronic circumferential scanning, thereby forming spiral scanning; the serial axial oblique probe controls the sound beam to enter the heat transfer pipe 7 in a certain direction with the axis of the heat transfer pipe 7 through coupling water, and an ultrasonic echo signal is obtained. The ultrasonic instrument converts the received ultrasonic echo signals into digital signals and transmits the digital signals back to the acquisition workstation, the digital signals are displayed in A, B, C, D scanning four modes through ultrasonic acquisition software and are provided for data analysts to carry out signal analysis to judge whether the heat transfer pipe 7 has defects and the qualitative and quantitative characteristics of the defects; if the defects exist, different sound beams can be further excited by a tandem focusing principle, so that the quantitative accuracy is improved.
The serial probe for ultrasonic inspection of the heat transfer tubes of the steam generator and the heat exchanger can complete circumferential scanning and covering of the whole heat transfer tube 7 while the serial axial oblique probe moves axially, and can effectively inspect corrosion defects and circumferential cracks of the heat transfer tube 7.
Example 2
A tandem probe for ultrasonic inspection of heat transfer tubes of a steam generator and a heat exchanger comprises a connector 1, a cable 2, a tandem probe 3 and a metal round baffle head 6, wherein the connector 1 is respectively connected with an ultrasonic instrument, a water tank and the cable 2, the cable 2 is connected with the tandem probe 3, and the metal round baffle head 6 is connected with the front end of the tandem probe 3.
The joint 1 is an ultrasonic joint; the joint 1 is connected with a water tank through a joint water pipe, and the water tank is connected with a water pump; the connector 1 is connected with the ultrasonic instrument through a multi-core cable connector.
The cable 2 is a combined cable and comprises a metal shielding net, a multi-core coaxial cable 8 and a single-core water pipe 9; and a multi-core coaxial cable 8 and a single-core water pipe 9 are sequentially and circumferentially arranged in the metal shielding net from outside to inside.
The signals between the serial probe 3 and the ultrasonic instrument are transmitted through a multi-core coaxial cable 8. The coupling water pump in the water tank is sent to the single-core water pipe 9 by the water pump, the serial probe 3 is soaked in the coupling water of the single-core water pipe 9, the coupling water is recycled and pumped into the water tank by the water pump, and the coupling water is recycled. The cable 2 can simultaneously supply water and transmit signals, and the double-layer shielding can reduce noise interference caused by long-distance transmission. The cable 2 is also used for sending the tandem probe 3 to a specified position in the heat transfer pipe 7, and the tandem probe 3 is driven to move along the axial direction of the pipeline by pulling the cable 2.
The serial probe 3 is a serial circumferential oblique probe, the serial circumferential oblique probe is composed of two groups of independent piezoelectric wafers distributed in an annular 360-degree mode, and each group of independent piezoelectric wafers is provided with two independent piezoelectric wafers; the length direction of the piezoelectric wafer and the heat transfer pipe 7 are arranged eccentrically; the piezoelectric wafer annular front is concentric with the heat transfer tube 7.
The serial circumferential oblique probe is controlled by an ultrasonic instrument to excite the piezoelectric wafer to perform electronic deflection according to a certain time sequence in the circumferential direction, so that circumferential electronic scanning is formed; the serial circumferential inclined probe adopts 4 piezoelectric wafers distributed in an annular 360-degree mode so as to ensure that the electronic scanning range covers the circumferential full range of the heat transfer pipe; the serial circumferential inclined probe controls sound beams to enter the heat transfer pipe 7 along the circumferential direction through the coupling water and the heat transfer pipe 7 to form creeping waves, and ultrasonic echo signals are obtained.
The refraction angle beta of the serial circumferential inclined probe is about 90 degrees; the center of the serial circumferential direction angled probe mounting hole is offset from the center of the heat transfer pipe 7, and the distance by which the center of the serial circumferential direction angled probe mounting hole is offset from the center of the heat transfer pipe 7 is calculated according to the following formula: eccentricity X ═ sin θ R, where: θ represents the underwater incident angle, and R represents the inner diameter of the heat transfer pipe 7.
Water immersion ultrasonic inspection, water layer thickness (the vertical distance from the tandem peripheral angled probe to the surface of the heat transfer tube 7) is an important design parameter. In order to avoid the influence of water interface waves on ultrasonic signals, the appropriate water layer thickness is designed, and secondary reflected waves of the serial circumferential inclined probe are ensured to be positioned between the primary water interface waves and the secondary water interface waves.
The metal round gear head 6 is in threaded connection with the front end of the serial circumferential inclined probe, and can be suitable for heat transfer pipes 7 of different specifications by replacing metal round gear heads 6 of different specifications.
The metal round stopper 6 is provided with double petals 4, the double petals 4 are flexible double-centering petal structures made of hard plastics, and the outer diameters of the flexible double-centering petal structures are matched with the inner diameter of the heat transfer pipe 7 (the outer diameters of the flexible double-centering petal structures are slightly larger than the inner diameter of the heat transfer pipe 7). The double petals 4 are used for keeping the serial circumferential oblique probe concentric with the heat transfer pipe 7, so that the coupling underwater sound layer is kept stable in the movement process.
The metal round stopper 6 is provided with a flexible ring 5, the flexible ring 5 is made of rubber, and the outer diameter of the flexible ring 5 is matched with the inner diameter of the heat transfer pipe 7 (the outer diameter of the flexible ring 5 is slightly larger than the inner diameter of the heat transfer pipe 7). The flexible ring 5 is used for blocking coupling water, so that the coupling water cannot leak from the front end of the serial circumferential inclined probe, the water coupling stability is guaranteed, and meanwhile, the water pump can be recycled and reused.
The serial probe for the ultrasonic inspection of the heat transfer tubes of the steam generator and the heat exchanger is applied to the ultrasonic inspection of the heat transfer tubes of the steam generator and the heat exchange tube, and the serial probe for the ultrasonic inspection of the heat transfer tubes of the steam generator and the heat exchanger enters the inside of the heat transfer tube 7 through the opening of the heat transfer tube 7. After reaching the appointed position, pulling the cable 2 to drive the serial circumferential inclined probe to move along the axial direction of the pipeline, and simultaneously controlling the serial circumferential inclined probe through an ultrasonic instrument to form electronic circumferential scanning so as to form spiral scanning; the serial circumferential inclined probe controls sound beams to enter the heat transfer pipe 7 along the circumferential direction through the coupling water and the heat transfer pipe 7 to form creeping waves, and ultrasonic echo signals are obtained. The ultrasonic instrument converts the received ultrasonic echo signals into digital signals and transmits the digital signals back to the acquisition workstation, the digital signals are displayed in A, B, C, D scanning four modes through ultrasonic acquisition software and are provided for data analysts to carry out signal analysis to judge whether the heat transfer pipe has defects and the qualitative and quantitative characteristics of the defects; if the defects exist, different sound beams can be further excited by a tandem focusing principle, so that the quantitative accuracy is improved.
The serial probe for ultrasonic inspection of the heat transfer tubes of the steam generator and the heat exchanger can complete circumferential scanning and covering of the whole heat transfer tube 7 while the serial circumferential inclined probe moves axially, and can effectively inspect circumferential cracks of the heat transfer tube 7.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. The tandem probe for ultrasonic inspection of the heat transfer tubes of the steam generator and the heat exchanger is characterized by comprising a joint, a cable, a metal round baffle head and a tandem probe, wherein the joint is respectively connected with an ultrasonic instrument, a water tank and the cable, the cable is connected with the tandem probe, and the metal round baffle head is connected with the front end of the tandem probe.
2. The steam generator and heat exchanger heat transfer tube ultrasonic inspection tandem probe of claim 1, wherein the tandem probe is a tandem axial tilt probe or a tandem circumferential tilt probe.
3. The steam generator and heat exchanger heat transfer tube ultrasonic inspection serial probe of claim 2, wherein the serial axial angled probe is comprised of two sets of two separate piezo wafers annularly disposed, each set of two separate piezo wafers, the length of the piezo wafers being angled with respect to the heat transfer tube, the array of piezo wafers being concentric with the heat transfer tube.
4. The steam generator and heat exchanger heat transfer tube ultrasonic inspection tandem probe of claim 3, wherein the refraction angle of the tandem axial direction angle probe is β, and the incident angle θ of the tandem axial direction angle probe in water, that is, the inclination angle of the mounting hole, is calculated by the following formula: an incident angle θ ═ arcsin (CW sin β/CS), where: CW represents the sound velocity in water, and CS represents the velocity of the oblique radio wave in the heat transfer tube.
5. The steam generator and heat exchanger heat transfer tube ultrasonic inspection serial probe of claim 2, wherein the serial circumferential angled probe is comprised of two sets of two independent piezoelectric wafers annularly distributed, each set of two independent piezoelectric wafers; the length direction of the piezoelectric wafer and the heat transfer pipe are eccentrically arranged; the piezoelectric wafer annular array surface is concentric with the heat transfer tube.
6. The steam generator and heat exchanger heat transfer tube ultrasonic inspection tandem probe of claim 5, wherein the center of the tandem peripheral oblique probe mounting hole is offset from the center of the heat transfer tube by a distance that is offset from the center of the heat transfer tube by the following equation: eccentricity X ═ sin θ R, where: theta represents an incident angle in water, and R represents an inner diameter of the heat transfer pipe.
7. The steam generator and heat exchanger heat transfer tube ultrasonic inspection tandem probe of claim 1, wherein the cable is a combination cable comprising a metallic shielding mesh, a multi-core coaxial cable and a single-core water tube; and a multi-core coaxial cable and a single-core water pipe are sequentially and circumferentially arranged in the metal shielding net from outside to inside.
8. The tandem probe for ultrasonic inspection of heat transfer tubes of steam generators and heat exchangers according to claim 1, wherein the metal round stopper is provided with double petals, the double petals are flexible double-centering petal structures made of hard plastics, and the outer diameter of the flexible double-centering petal structures is matched with the inner diameter of the heat transfer tubes.
9. The steam generator and heat exchanger heat transfer tube ultrasonic inspection tandem probe of claim 1, wherein said metal collar is fitted with a flexible ring made of rubber, said flexible ring having an outside diameter matching the inside diameter of the heat transfer tube.
10. The steam generator and heat exchanger heat transfer tube ultrasonic inspection tandem probe of any one of claims 1 to 9, wherein the metal collar is threadably connected to the tandem probe front end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023272817.4U CN214473003U (en) | 2020-12-30 | 2020-12-30 | Serial probe for ultrasonic inspection of heat transfer tubes of steam generator and heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023272817.4U CN214473003U (en) | 2020-12-30 | 2020-12-30 | Serial probe for ultrasonic inspection of heat transfer tubes of steam generator and heat exchanger |
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| CN214473003U true CN214473003U (en) | 2021-10-22 |
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