CN112179984A

CN112179984A - Ultrasonic probe device for pipeline detection

Info

Publication number: CN112179984A
Application number: CN201910593393.4A
Authority: CN
Inventors: 肖爱武; 袁光华; 石欢; 邓黎; 张乐; 汪军; 严小波; 聂衍; 李�一
Original assignee: State Nuclear Power Plant Service Co Ltd
Current assignee: State Nuclear Power Plant Service Co Ltd
Priority date: 2019-07-03
Filing date: 2019-07-03
Publication date: 2021-01-05

Abstract

The invention provides an ultrasonic probe device for pipeline detection, which comprises: the guide pipe is internally provided with a cable and a water supply pipe, and one ends of the cable and the water supply pipe extend to the outside of the pipeline; the first probe assembly comprises a clamping device communicated with the conduit and a linear array phased array probe arranged on the clamping device, the linear array phased array probe comprises a plurality of first-class wafers, and all the first-class wafers are linearly arranged on the clamping device; the second probe assembly comprises a phased array probe which is sleeved on the guide pipe, the phased array probe comprises a plurality of second type wafers which are divided into two groups, conical surfaces formed by the two groups of second type wafers are mutually symmetrical, and the bottoms of the conical surfaces are abutted. The invention has the advantages that: through setting up first probe subassembly and second probe subassembly, utilize different wafer mode of arranging to realize the detection to the axial of pipeline, circumference defect and wall thickness attenuate change, the defect relevance ratio is high.

Description

Ultrasonic probe device for pipeline detection

Technical Field

The invention belongs to the technical field of nondestructive testing equipment, and particularly relates to an ultrasonic probe device for pipeline testing.

Background

With the development of modern industry, various pipelines are widely applied to industrial production, and a heat transfer pipe is one of the pipelines. Heat transfer tubes have many properties: the heat resistance, the heat stability and the heat welding performance are good; the matrix structure is stable, the heat conductivity is high, and the thermal expansion coefficient is small; the uniform corrosion resistance and the local corrosion resistance are strong; has enough plasticity and toughness. Therefore, the heat transfer pipe is widely applied to the fields of nuclear power, chemical industry, petrochemical industry and the like. In the working process, due to the influence of factors such as high temperature, high pressure, fluid vibration, medium action and the like, the heat transfer pipe is easy to crack, thin, wear and the like, leakage can occur under severe conditions, and finally serious economic loss is caused. Therefore, the heat transfer pipe is subjected to periodic nondestructive testing to ensure the integrity of the heat transfer pipe, and the heat transfer pipe has very important significance for safe and stable production.

Common ducts are, in addition to heat transfer tubes, also ventilation tubes. The ventilation pipe is mainly a top cover penetrating piece of a reactor pressure vessel of the nuclear power station, and daily detection of J welding seams of the penetrating piece and base metal areas on two sides is needed. The conventional ultrasonic detection probe needs to rotate during scanning, the detection efficiency is low, B-scanning and C-scanning images are not generated, and the detection is not intuitive.

At present, the nondestructive testing method for the heat transfer pipe is mainly eddy current testing which can carry out high-speed testing and is easy to realize automation, but the eddy current testing still has certain limitations: firstly, eddy current inspection is not suitable for parts with complex shapes, and can only detect surface and near-surface defects, and the inspection result is easily interfered by materials and other factors; secondly, the eddy current inspection has low efficiency of inspecting cracks which are complex in shape and not in the axial direction or the annular direction; the method has certain limitations on the length measurement and depth measurement of the circumferential cracks in the areas such as the heat transfer pipe expansion transition area, and the like, and has unobvious circumferential crack detection effect and severely limited pitting detection capability on the very small areas such as the expansion pipe transition area, and the like; the eddy current inspection has a dead zone to a certain extent, and the partial region of the heat transfer pipe may have reasons such as being inaccessible. In contrast, other nondestructive testing methods are considered to be adopted for the cooperative testing of the heat transfer tube, but due to the structural influence of the heat transfer tube, the ultrasonic testing of the conventional probe cannot meet the testing requirements. The ultrasonic detection method adopted in China is mostly rotary ultrasonic detection, rotary ultrasonic is based on a pulse echo detection method, and is similar to a water immersion ultrasonic flaw detection principle, a focusing probe excites a high-frequency pulse to generate ultrasonic waves in water, the ultrasonic waves propagate along the central direction of a tube bundle and hit a reflector with an angle of 45 degrees, the ultrasonic waves are reflected into beams which are vertically incident along the radial direction of the inner diameter of the tube, the inner surface and the outer surface of the tube can reflect back a wave, and the inner diameter, the outer diameter, the wall thickness and other numerical values of the tube can be obtained through calculation after the time and the amplitude of the inner surface echo and the outer surface echo are processed through system digitization, so that the corrosion condition of the heat transfer tube is monitored, but the rotary ultrasonic is not ideal for small cracks, particularly the detection rate of circumferential cracks is low, and the detection is possible.

Disclosure of Invention

In view of the above-mentioned defects, the present invention provides an ultrasonic probe apparatus for pipeline inspection, which can improve inspection efficiency and inspection rate, and is suitable for periodically inspecting heat transfer pipes and ventilation pipes, especially heat transfer pipe expansion areas and ventilation pipe penetration piece J weld areas on a reactor pressure vessel top cover.

An ultrasonic probe device for pipeline inspection, located in a pipeline, comprising: the guide pipe is coaxial with the pipeline, a cable and a water supply pipe are arranged in the guide pipe, and one ends of the cable and the water supply pipe extend to the outside of the pipeline; the first probe assembly comprises a clamping device communicated with the conduit and a linear array phased array probe arranged on the clamping device, the linear array phased array probe comprises a plurality of first type wafers, all the first type wafers are linearly arranged on the clamping device, and the arrangement direction is perpendicular to the axial direction of the pipeline; the second probe assembly comprises a phased array probe sleeved on the guide pipe, the phased array probe comprises a plurality of second type wafers divided into two groups, each group of second type wafers are distributed along the circumferential direction of the guide pipe and form a certain included angle with the guide pipe to form a conical surface, the conical surfaces formed by the two groups of second type wafers are mutually symmetrical, and the bottoms of the conical surfaces are abutted; the petal self-locking device is sleeved on the guide pipe, and the first probe assembly and the second probe assembly are arranged on the inner side of the petal self-locking device; the cable penetrates through the guide pipe to be connected with the first probe assembly and the second probe assembly, a water spraying hole is further formed in the guide pipe between the first probe assembly and the second probe assembly, and the water supply pipe is communicated with the water spraying hole.

Preferably, the petal self-locking device comprises two flexible petals, the outer diameter of each petal is larger than the inner diameter of the pipeline, and the first probe assembly and the second probe assembly are located between the two petals.

Preferably, one end of the petal located at the front is also provided with a guide.

Preferably, the size of the first type wafer is 0.6mm × 10mm, and the frequency is 5MHz to 10 MHz.

Preferably, the size of the second type wafer is 5mm multiplied by 9mm, and the frequency is 5MHz to 10 MHz.

Preferably, the conduit is made of a nylon material.

Preferably, the end of the conduit is provided with a watertight plug.

Preferably, the plurality of second type wafers are disposed on the guide tube through a fixing block.

The invention has the advantages that the axial and circumferential defects and the wall thickness reduction change of the pipeline are respectively detected by the arrangement of the first probe assembly and the second probe assembly and the wafer arrangement modes of the linear surface and the conical surface, the detection omission risk is reduced, the defect detection rate is high, the positioning is accurate, the wafer transmitting/receiving in the phased array probe can be controlled by the electronic circuit, the functions of focusing characteristic, angle deflection range and the like are set, and the detection can be efficiently finished at one time. The whole device is simple in principle, easy and convenient to operate, high in detection efficiency and high in accuracy, and can be widely applied to detection of heat transfer pipes in various fields and reactor pressure vessel top cover ventilation pipe penetration pieces of nuclear power station units of various types by changing the specification and the size of the probe device, so that the device is high in practicability.

Drawings

FIG. 1 is a schematic structural view of an ultrasonic probe apparatus of the present invention;

FIG. 2 is a schematic view of the first probe assembly in operation;

figure 3 is a schematic view of the second probe assembly in operation.

Element number description:

1 guide piece

2 flower petal

3 first Probe Assembly

31 clamping device

32 first type wafer

4 second Probe Assembly

41 second type wafer

5 catheter

6 pipeline

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "front", "rear", "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1, the present invention provides an ultrasonic probe device for pipeline inspection, which is located in a pipeline 6 and mainly comprises: the device comprises a catheter 5, a petal self-locking device, a first probe assembly 3 and a second probe assembly 4. Wherein, pipe 5 and pipeline 6 coaxial setting, and inside be equipped with cable conductor and delivery pipe, the one end of cable conductor and delivery pipe extends to the pipeline 6 outside, and the delivery pipe is preferably connected with water tank and the water pump that is located the pipeline 6 outside to supply water for ultrasonic testing operation.

Petal self-lock device detachably cover is established on pipe 5, and first probe subassembly 3 and second probe subassembly 4 all are located petal self-lock device inboard. Preferably, petal self-lock device includes two

flexible petals

2, and 2 covers of petal are established on pipe 5, and the external diameter is greater than the internal diameter of pipeline 6, and first probe unit spare 3 and second probe unit spare 4 are located between two petals 2. When the ultrasonic probe device is inserted into the pipeline 6, the flexible petals 2 are pressed by the pipe wall to keep an inward contraction state and are always locked with the inner wall of the pipeline 6, so that the probe device can always keep coaxial with the pipeline 6 in the advancing process and does not deviate. When the device is used specifically, the petals 2 with different outer diameters can be replaced according to the inner diameter of the pipeline 6. Preferably, one end of the petal 2 located in front is further provided with a guide member 1, the guide member 1 is conical, the outer diameter of the guide member 1 is slightly smaller than the inner diameter of the pipeline 6, and the guide member and the pipeline 6 are coaxially arranged, and the guide member is used for opening the ultrasonic probe device in the pipeline 6, breaking through impurities in the pipeline 6, such as rust or scale, and avoiding the ultrasonic probe device from being damaged by the impurities in the movement process.

Because the water logging ultrasonic inspection needs couplant water, first probe subassembly 3 and second probe subassembly 4 need be totally soaked in aquatic just can normally work, consequently still open the hole for water spraying on being located the pipe 5 between first probe subassembly 3 and second probe subassembly 4, the delivery pipe is linked together with the hole for water spraying. In addition, the inlet end of the pipeline 6 is also provided with a watertight plug, so that water sprayed out of the water supply pipe can be locked in the pipeline 6 where the first probe assembly 3 and the second probe assembly 4 are located as far as possible, and water can be continuously supplied through the water supply pipe, and even if part of water runs off along the pipeline 6, the first probe assembly 3 and the second probe assembly 4 can be guaranteed to be in a complete water coupling state during ultrasonic detection.

As shown in fig. 1 and 2, the first probe assembly 3 includes a holding device 31 communicated with the conduit 5, and a linear array phased array probe disposed on the holding device 31, the linear array phased array probe includes a plurality of first type wafers 32, all the first type wafers 32 are arranged on the holding device 31 along a straight line, and the arrangement direction is perpendicular to the axial direction of the pipeline 6. Specifically, the holding device 31 is a semi-cylinder, both ends of which are communicated with the conduit 5. All the first type wafers 32 are adhered to the bottom surface of the holding device 31 by epoxy glue and arranged along the diameter direction of the holding device 31, and in order to reduce the detection dead angle as much as possible, the diameter of the holding device 31 is slightly smaller than the inner diameter of the pipeline 6. The cable is fed from the conduit 5 into the holding device 31 and is connected to the first type wafer 32 through an opening in the bottom surface of the holding device 31. Preferably, the first type of wafer 32 has a size of 0.6mm x 10mm and a frequency of 5MHz to 10MHz, specifically 10 MHz. During detection, the first type of wafers 32 can be sequentially activated according to the arrangement direction of the first type of wafers 32, a plurality of longitudinal waves A with different incident angles are formed on the inner wall of the pipeline 6 through water coupling, and the detection of the circumferential defects and the wall thickness reduction condition of the pipeline 6 can be completed only by rotating the ultrasonic probe device once.

As shown in fig. 1 and 3, the second probe assembly 4 includes a phased array probe sleeved on the guide tube 5, the phased array probe includes a plurality of second type wafers 41 divided into two groups, each second type wafer 41 is closely arranged along the circumferential direction of the guide tube 5 and has a certain included angle with the guide tube 5 to form a conical surface, the conical surfaces formed by the two groups of second type wafers 41 are symmetrical to each other, and the bottoms of the conical surfaces are abutted to each other. Specifically, two conical fixing blocks with abutting bottoms are arranged on the conduit 5, and each group of second type wafers 41 is adhered to the fixing blocks through epoxy glue. In addition, the guide tube 5 and the fixing block are provided with corresponding openings, and the cables are connected with the second type wafer 41 through the openings. Preferably, the second type of wafer 41 has a size of 5mm × 9mm and a frequency of 5MHz to 10MHz, specifically 7.5 MHz. During detection, two second type wafers 41 corresponding to each other in position in the two groups of second type wafers 41 can be sequentially activated in the circumferential direction, two longitudinal waves B with refraction angles of 45 +/-15 degrees are simultaneously formed on the inner wall of the pipeline 6 after water coupling is carried out, and axial defect detection in the pipeline 6 can be completed without rotating an ultrasonic probe device. Although the wafers parallel to the axial direction of the pipe 5 can form longitudinal waves with a refraction angle of 45 degrees on the inner wall of the pipe 6 by the phased array technology, compared with the detection effect, the obliquely arranged second type wafer 41 has better emission effect and more concentrated energy, and can better detect the axial defects in the pipe 6.

In order to make the ultrasonic probe device of the present invention small and light, and resistant to corrosion and abrasion, it is preferable that both the guide tube 5 and the guide member 1 are made of nylon material. Furthermore, the cable line should have waterproof properties and be long and thin enough to ensure sufficient space for arranging the cable line in the conduit 5. The cable 5 should also be made of a material with low impedance, so as to reduce the energy loss of signals and effectively connect the detecting instrument and the probe.

The following is an application example of the present invention:

insert the pipeline 6 with ultrasonic probe device earlier, make locking between petal self-lock device and the pipeline 6, the delivery pipe through in the pipe 5 makes near pipeline 6 of first probe subassembly 3 and second probe subassembly 4 fill with water, and the delivery pipe supplies water continuously, guarantees that first probe subassembly 3 and second probe subassembly 4 are soaked in aquatic completely, and the cable conductor in the pipe 5 is connected well with the detecting instrument such as the computer that is located the pipeline 6 outside again, begins to detect after the signal is stable. Because two probes in the ultrasonic probe device can control the emission and the acceptance of each array element through the electronic circuit to realize electronic linear scanning, the defect information can be transmitted into a computer to be analyzed and processed uniformly during working, and a worker can evaluate and process the defects in the pipeline 6 according to the information detected by the phased array probe.

In conclusion, the invention has the advantages that: through setting up first probe subassembly and second probe subassembly, utilize the wafer mode of arranging of line type and conical surface to realize respectively that the wafer transmission/reception in the electronic circuit control phased array probe can be utilized to reduce the risk of undetected, the defect detectable rate is high, and the location is accurate to the axial of pipeline, circumference defect and the detection of wall thickness attenuate change, sets up functions such as focus characteristic and angle deflection scope, can once only accomplish the detection high-efficiently. The principle of whole device is simple, and is easy and simple to handle, and detection efficiency is high, and the precision is high, through the specification and size who changes the probe, can detect with the reactor pressure vessel top cap ventilation pipe penetration piece of the nuclear power station unit of wide application in the heat-transfer pipe of each field and various models, the practicality is high.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An ultrasonic probe device for pipeline inspection, located in a pipeline (6), comprising:

the guide pipe (5) is coaxial with the pipeline (6), a cable and a water supply pipe are arranged in the guide pipe, and one ends of the cable and the water supply pipe extend to the outside of the pipeline (6);

the first probe assembly (3) comprises a clamping device (31) communicated with the guide pipe (5) and a linear array phased array probe arranged on the clamping device (31), wherein the linear array phased array probe comprises a plurality of first type wafers (32), all the first type wafers (32) are linearly arranged on the clamping device (31), and the arrangement direction is perpendicular to the axial direction of the pipeline (6);

the second probe assembly (4) comprises a phased array probe sleeved on the guide pipe (5), the phased array probe comprises a plurality of second type wafers (41) divided into two groups, each group of second type wafers (41) is distributed along the circumferential direction of the guide pipe (5) and forms a certain included angle with the guide pipe (5) to form a conical surface, the conical surfaces formed by the two groups of second type wafers (41) are mutually symmetrical, and the bottoms of the conical surfaces are abutted;

the petal self-locking device is sleeved on the guide pipe (5), and the first probe assembly (3) and the second probe assembly (4) are arranged on the inner side of the petal self-locking device;

the cable penetrates through the conduit (5) to be connected with the first probe assembly (3) and the second probe assembly (4), a water spray hole is further formed in the conduit (5) between the first probe assembly (3) and the second probe assembly (4), and the water supply pipe is communicated with the water spray hole.

2. The ultrasonic probe device as recited in claim 1, characterized in that the petal self-locking device comprises two flexible petals (2), the outer diameter of the petals (2) is larger than the inner diameter of the conduit (6), and the first probe assembly (3) and the second probe assembly (4) are located between the two petals (2).

3. Ultrasound probe device according to claim 2, characterized in that the petals (2) located in front are also provided with a guide (1) at one end.

4. The ultrasound probe device according to claim 1, wherein the size of the first type wafer (32) is 0.6mm x 10mm and the frequency is 5MHz to 10 MHz.

5. Ultrasound probe device according to claim 1, characterized in that the size of the second type wafer (41) is 5mm x 9mm and the frequency is 5MHz to 10 MHz.

6. Ultrasound probe device according to claim 1, characterized in that the catheter (5) is made of a nylon material.

7. Ultrasound probe device according to claim 1, characterized in that the end of the conduit (6) is provided with a watertight plug.

8. Ultrasound probe device according to claim 1, characterized in that the plurality of second type wafers (41) are arranged on the catheter (5) by means of a fixing block.