PA imaging detection device and method for corrosion condition of heat exchanger tube bundle

Abstract

The invention relates to a heat exchanger tube bundle corrosion condition PA imaging detection device and method, and relates to the field of heat exchanger detection equipment.The heat exchanger tube bundle corrosion condition PA imaging detection device comprises a detection probe assembly and a penetrating supporting piece, the detection probe assembly is connected with the penetrating supporting piece and can be arranged in a tube bundle in a penetrating mode, and the penetrating supporting piece is used for driving the detection probe assembly to move in the tube bundle; the detection probe assembly comprises a PA probe, a water conveying pipe, a first check block and a second check block, the first check block and the second check block are connected with the penetrating supporting piece, matched with an inner hole of the tube bundle and arranged at an interval so as to form a water storage space with the tube bundle, and the PA probe is located in the water storage space and connected with the first check block and the second check block; the PA probe can detect the circumferential direction of the pipe bundle, and the water conveying pipe is arranged on the second check block in a penetrating mode and can communicate with the water storage space so that water can be continuously supplied to the water storage space. According to the invention, a large-volume water pool can be prevented from being provided for a large heat exchanger, the detection cost is reduced, and the detection convenience and applicability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat exchanger detection equipment, in particular to a heat exchanger tube bundle corrosion condition PA imaging detection device and method. BACKGROUND

[0002] In the field of power plants, the tube bundle of the shell-and-tube heat exchanger plays an important role, and its operating condition is directly related to the stability and safety of the unit. With the continuous development of industry, the performance and reliability requirements of the heat exchanger tube bundle are also increasing. During the long-term operation of the heat exchanger tube bundle, its tube wall will inevitably be affected by various factors. Once corrosion occurs, it will pose a serious threat to the safe operation of the entire unit, and even may cause unplanned shutdown accidents, causing huge economic losses to the enterprise. Therefore, it is of great significance to accurately detect the corrosion condition of the heat exchanger tube bundle and timely discover potential safety hazards. This not only helps to ensure the stable operation of the unit, but also improves production efficiency and reduces operating costs.

[0003] At present, in the field of pipeline component detection, water-immersed ultrasonic probes are widely used due to their stable coupling, high detection accuracy, low loss, and strong adaptability. For general pipeline component detection, the common practice is to immerse the pipeline component in water and then detect it by using a water-immersed ultrasonic probe. This method can meet the detection requirements to some extent and provides an effective means for the quality detection of pipeline components. However, in the detection of the shell-and-tube heat exchanger tube bundle, since the volume of the heat exchanger is usually large and the disassembly of the tube bundle and internal components is difficult, if the existing water-immersed ultrasonic probe is used for detection, a large-volume water pool needs to be provided for the heat exchanger. This not only increases the cost and difficulty of detection, but also makes the detection process more complex.

[0004] The existing water-immersed ultrasonic probe detection scheme needs a large-volume water pool when applied to the detection of the shell-and-tube heat exchanger tube bundle, resulting in a relatively complex detection process of the heat exchanger tube bundle, which is no longer suitable for corrosion detection of the heat exchanger tube bundle. SUMMARY

[0005] In order to improve the problem that the existing water-immersed ultrasonic probe detection process of the heat exchanger tube bundle is relatively complex, the present application provides a heat exchanger tube bundle corrosion condition PA imaging detection device and method.

[0006] The heat exchanger tube bundle corrosion condition PA imaging detection device and method provided by the present application adopt the following technical scheme: A heat exchanger tube bundle corrosion condition PA imaging detection device, comprising a detection probe assembly and a penetrating support, the detection probe assembly is connected with the penetrating support and can penetrate in the tube bundle, the penetrating support is used to drive the detection probe assembly to move in the tube bundle; The detection probe assembly comprises a PA probe, a water supply pipe, a first stop block and a second stop block, the first stop block and the second stop block are connected with the penetrating support and are adapted to the inner hole of the tube bundle and are arranged at intervals to form a water storage space with the tube bundle, the PA probe is located in the water storage space and is connected with the first stop block and the second stop block, the PA probe can detect the circumference of the tube bundle, and the water supply pipe penetrates the second stop block and can communicate with the water storage space to continuously supply water to the water storage space.

[0007] By adopting the above technical scheme, when the corrosion of the tube bundle of the heat exchanger is detected, the detection probe assembly is inserted into the inner hole of the tube bundle of the heat exchanger through the penetrating support, then the water supply pipe supplies water to the water storage space, so that the water fills the water storage space and continuously supplies water to the water storage space, then the PA probe detects the tube bundle of the heat exchanger by taking water as the coupling medium, and the first stop block and the second stop block and the PA probe are driven to move along the tube bundle through the penetrating support, so that the tube bundle is comprehensively detected. Compared with the prior art, the water storage space formed between the first stop block, the second stop block and the tube bundle is supplied with water, so that a large-capacity water pool is not needed, the detection process of the tube bundle of the heat exchanger is simplified, and the corrosion condition of the tube bundle of the heat exchanger is suitable for detection.

[0008] Preferably, the first stop block and the second stop block are both provided with a drainage channel, one end of the drainage channel is in communication with the water storage space, and the other end is in communication with the outside.

[0009] By adopting the above technical scheme, the drainage channel can exchange the water in the water storage space with the outside, prevent the water pressure in the water storage space from being too large to affect the detection, ensure the stability of the detection process, and further improve the reliability and accuracy of the corrosion detection of the tube bundle of the heat exchanger.

[0010] Preferably, the measurement assembly comprises a mounting member, a roller and an encoder, the mounting member can be detachably mounted and fixed on the heat exchanger, the roller is rotationally connected with the mounting member and can abut against the penetrating support, the penetrating support can drive the roller to rotate, and the encoder is arranged on the mounting member and connected with the roller.

[0011] By adopting the above technical scheme, when the corrosion of the tube bundle of the heat exchanger is detected, the detection probe assembly is moved in the tube bundle by the penetrating support, the roller abutting against the penetrating support is driven to rotate during the movement of the penetrating support, and the encoder can record the rotation of the roller, so as to accurately measure the movement distance and position of the detection probe assembly in the tube bundle, provide accurate position information for the detection result, and help to more accurately determine the position of the corrosion area.

[0012] Preferably, the mounting member comprises a connecting structure connected with the heat exchanger, a rotating rod rotationally connected with the connecting structure, and the roller and the encoder are arranged on the rotating rod, and the connecting structure is provided with an elastic member connected with the rotating rod, and the elastic member can pull the roller to abut against the penetrating support.

[0013] By adopting the above technical scheme, the elastic member pulls the roller to abut against the penetrating support, so that the roller can stably follow the rotation of the penetrating support, the encoder can accurately obtain the movement information of the penetrating support, and the accuracy of data collection in the detection process of the heat exchanger tube bundle is improved.

[0014] Preferably, the first sealing assembly is arranged on the first block and can seal the gap between the first block and the inner wall of the tube bundle, and the second sealing assembly is arranged on the second block and can seal the gap between the second block and the inner wall of the tube bundle.

[0015] By adopting the above technical scheme, the first sealing assembly and the second sealing assembly are used to seal the gaps between the first block, the second block and the inner wall of the tube bundle respectively, so as to prevent water leakage in the water storage space, ensure the stability of the PA probe detection process with water as the coupling medium, and improve the detection accuracy.

[0016] Preferably, the first sealing assembly comprises a first elastic sealing layer and a second elastic sealing layer, a sealing cavity is arranged in the first block, one end of the sealing cavity penetrates through the peripheral side wall of the first block, the first elastic sealing layer covers one end of the sealing cavity located on the peripheral side wall of the first block, and the second elastic sealing layer covers the other end of the sealing cavity, so that the sealing cavity forms a closed space, and the first block is provided with a pressing member capable of pressing the second elastic sealing layer, so that the first elastic sealing layer can protrude outward from the first block.

[0017] By adopting the above technical scheme, when the heat exchanger tube bundle corrosion detection is performed, the second elastic sealing layer is pressed by the pressing member, the first elastic sealing layer protrudes outward from the first block, and the gap between the first block and the inner wall of the tube bundle is better sealed, so that the water leakage in the water storage space is prevented, the water flow in the water storage space is not disturbed, and the stability and accuracy of the PA probe detection with water as the coupling medium are improved.

[0018] Preferably, the extrusion piece comprises a connecting rod and an extrusion plate, the connecting rod is fixedly connected with the PA probe, the connecting rod is slidably arranged on the first stopper, the extrusion plate is fixedly connected with the connecting rod and located on the side of the first stopper away from the PA probe, and the first stopper is capable of moving towards the extrusion plate under the water pressure of the water storage space so that the extrusion plate can extrude the second elastic sealing layer.

[0019] By adopting the above technical scheme, under the water pressure of the water storage space, the first stopper moves towards the extrusion plate to make the extrusion plate extrude the second elastic sealing layer, the first elastic sealing layer protrudes outwards from the first stopper, the sealing effect between the first stopper and the inner wall of the pipe bundle is enhanced, the water leakage of the water storage space is reduced, and no additional action of extruding the second elastic sealing layer is needed, thereby improving the convenience of sealing of the first elastic sealing layer.

[0020] Preferably, a base is arranged on the connecting rod, the base is located between the first stopper and the PA probe, an extrusion spring is arranged on the base, and the extrusion spring is capable of extruding the first stopper towards the extrusion plate.

[0021] By adopting the above technical scheme, when the detection device is in operation, the extrusion spring can extrude the first stopper towards the extrusion plate, the extrusion plate can better extrude the second elastic sealing layer, the first elastic sealing layer protrudes outwards from the first stopper, the gap between the first stopper and the inner wall of the pipe bundle is better sealed, and the sealing performance of the water storage space is improved.

[0022] Preferably, a stopper rod is hingedly arranged on the base, the stopper rod is capable of blocking the elongation of the extrusion spring, a control block is arranged on the stopper rod, and a control sleeve is fixedly arranged on the first stopper. When the control block is in contact with the control sleeve, the stopper rod can block the elongation of the extrusion spring; when the control block is separated from the control sleeve, the stopper rod unblocks the extrusion spring.

[0023] By adopting the above technical scheme, the action of the extrusion spring can be flexibly controlled during the detection process, the control block is separated from the control sleeve when needed, the stopper rod unblocks the extrusion spring, the extrusion spring pushes the first stopper, the extrusion plate extrudes the second elastic sealing layer, the first elastic sealing layer protrudes outwards from the first stopper, the sealing effect between the first stopper and the inner wall of the pipe bundle is enhanced, the accuracy and reliability of the detection are improved, and the detection error caused by poor sealing is avoided.

[0024] The application discloses a PA imaging detection method for a heat exchanger tube bundle corrosion condition, and a PA imaging detection device for the heat exchanger tube bundle corrosion condition.

[0025] To sum up, the application has at least one of the following beneficial technical effects: 1. The detection probe assembly is inserted into the tube bundle through the support, and water is continuously supplied to the water storage space formed by the first block, the second block and the tube bundle through the water supply pipe, so that the PA probe detects the tube bundle in the circumferential direction with water as the coupling medium, the large-capacity water pool for the large heat exchanger is avoided, the detection cost is reduced, and the convenience and applicability of the detection are improved; 2. The rotation of the encoder recording roller is recorded, so that the moving distance and position of the detection probe assembly in the tube bundle are accurately measured, accurate position information of the detection result is provided, and the position of the corrosion area is more accurately determined; 3. The first sealing assembly and the second sealing assembly are used for sealing the gap between the first block, the second block and the inner wall of the tube bundle respectively, water leakage in the water storage space is avoided, the PA probe detection process with water as the coupling medium is stable, and the detection accuracy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structure schematic view of a PA imaging detection device for a heat exchanger tube bundle corrosion condition according to the embodiment 1 of the application.

[0027] Figure 2 It is a side view showing that the support is inserted into the tube bundle.

[0028] Figure 3 It is a sectional view along the line A-A in the figure. Figure 2

[0029] Figure 4 It is a structure relationship schematic view for showing the first block and the second block.

[0030] Figure 5 It is​Figure 1 Enlarged view of section B.

[0031] Figure 6 is a structural schematic diagram for showing the flushing conduit.

[0032] Figure 7 is a top view for showing the cooperation of the penetrating support and the tube bundle in embodiment 2.

[0033] Figure 8 is a sectional view along Figure 7 line C-C.

[0034] Figure 9 is a Figure 8 enlarged view of section D.

[0035] Figure 10 is a structural schematic diagram for showing the base.

[0036] Figure 11 is a Figure 8 enlarged view of section E.

[0037] Figure 12 is a structural schematic diagram for showing the third elastic sealing layer.

[0038] BRIEF DESCRIPTION OF DRAWINGS 1, tube bundle; 2, detection probe assembly; 21, PA probe; 22, water delivery pipe; 23, first stop block; 24, second stop block; 25, water storage space; 26, drainage channel; 3, penetrating support; 4, measurement assembly; 41, mounting piece; 411, connecting structure; 4111, magnetic base; 4112, rotating support; 412, rotating rod; 42, roller; 43, encoder; 44, elastic piece; 45, tube plate surface; 51, flushing conduit; 52, flushing head; 53, conical surface; 54, flushing port; 6, first sealing assembly; 61, first elastic sealing layer; 62, second elastic sealing layer; 63, sealing cavity; 631, annular groove; 632, extrusion cavity; 64, extrusion piece; 641, connecting rod; 642, extrusion plate; 643, extrusion rod; 651, base; 652, extrusion spring; 653, mounting ring; 654, stop rod; 655, control sleeve; 656, control block; 7, second sealing assembly; 71, third elastic sealing layer; 72, annular sealing groove; 73, gas supply pipe. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be further described in detail below with reference to the accompanying drawings. Figures 1-12 The embodiments described are only possible technical implementations of the present application, but are not limited thereto, and those skilled in the art can certainly combine the embodiments of the present application without creative effort to obtain other embodiments, which are also within the protection scope of the present application.

[0040] The application mainly adopts the scheme of driving the detection probe assembly 2 to detect the tube bundle 1 by the penetrating support 3 and using water as the coupling medium, so as to simplify the detection process of the heat exchanger tube bundle 1 and achieve the effect of corrosion detection of the tube bundle 1. The application is further described in detail below.

[0041] Embodiment 1 With reference to Figure 1 , Figure 2 and Figure 3 , a heat exchanger tube bundle corrosion condition PA imaging detection device includes a detection probe assembly 2, a penetrating support 3, and a measurement assembly 4. The penetrating support 3 in this embodiment is a solid rubber tube. The detection probe assembly 2 is arranged at the front end of the penetrating support 3 and can be inserted into the inner hole of the tube bundle 1 of the heat exchanger together with the penetrating support 3. The detection probe assembly 2 in this embodiment includes a PA probe 21, a water delivery pipe 22, a first stop block 23, and a second stop block 24. The first stop block 23 and the second stop block 24 are both cylindrical plastic stop blocks, and the outer diameter of the stop blocks is adapted to the inner diameter of the tube bundle 1 to reduce the water leakage between the stop blocks and the tube bundle 1. The first stop block 23 and the second stop block 24 are arranged in the length direction of the tube bundle 1 at intervals. When the first stop block 23 and the second stop block 24 are inserted into the tube bundle 1, a water storage space 25 is formed between the first stop block 23, the second stop block 24, and the tube bundle 1. The PA probe 21 is arranged between the first stop block 23 and the second stop block 24, the first stop block 23 is located at the front end of the PA probe 21, and the second stop block 24 is located at the rear end of the PA probe 21. The PA probe 21 and the first stop block 23 and the second stop block 24 are detachably connected and fixed by PPR insert joints. The second stop block 24 is also connected to the penetrating support 3 by a PPR insert joint, so that different diameter stop blocks can be replaced when detecting tube bundles 1 of different diameters, to adapt to the detection of tube bundles 1 of different diameters of heat exchangers.

[0042] The water delivery pipe 22 is embedded in the penetrating support 3 and penetrates the second stop block 24, so that the outlet of the water delivery pipe 22 communicates with the water storage space 25, and the inlet of the water delivery pipe 22 is connected to a water pump, so that the water delivery pipe delivers the coupling medium water into the water storage space 25. The diameter of the PA probe 21 is smaller than the diameter of the first stop block 23 and the second stop block 24, so that a water layer is formed between the PA probe 21 and the tube bundle 1. The PA probe 21 in this application adopts a high-density annular full-coverage array, the number of wafers is increased to 128, and the wafers are uniformly distributed in the annular carrier. Each wafer is independently controlled, supports "single wafer activation" or "multiple wafer group cooperative activation", the electronic fan scanning range of adjacent wafer groups overlaps ≥10%, eliminates scanning blind area, through the circumferential scanning control algorithm, the system activates each group in clockwise / counter-clockwise order, cooperates with electronic fan scanning, realizes 360° continuous scanning. The cable required by the PA probe 21 is embedded in the penetrating support 3 and penetrates the stop block at the rear end of the PA probe 21, to realize the transmission of electric energy and signal.

[0043] In the detection of the corrosion of the heat exchanger tube bundle 1, the first block 23, the second block 24 and the PA probe 21 are inserted into the hole of the heat exchanger tube bundle 1 through the support 3, then the water supply pipe 22 supplies water into the water storage space 25, so that the water fills the water storage space 25, and the water continues to be supplied into the water storage space 25, then the PA probe 21 detects the heat exchanger tube bundle 1 with water as the coupling medium, and the first block 23, the second block 24 and the PA probe 21 are driven to move along the tube bundle 1 through the support 3, so that the overall detection of the tube bundle 1 is realized, and the water is supplied to the water storage space 25 formed between the first block 23, the second block 24 and the tube bundle 1, so that a large-capacity water pool does not need to be provided, the detection process of the heat exchanger tube bundle 1 is simplified, and the corrosion condition of the heat exchanger tube bundle 1 is detected.

[0044] With reference to Figure 3 , Figure 4 , the first block 23 and the second block 24 are both provided with a drainage channel 26, the drainage channel 26 in the embodiment is arranged on the surface of the first block 23 or the second block 24 along the axial direction of the first block 23 or the second block 24, one end of the drainage channel 26 is communicated with the water storage space 25, and the other end is communicated with the outside, so that the water in the water storage space 25 can be drained along the drainage channel 26, the influence of the excessive water pressure in the water storage space 25 on the detection is prevented, the stability of the detection process is ensured, and the reliability and accuracy of the corrosion detection of the heat exchanger tube bundle 1 are further improved.

[0045] With reference to Figure 1 , Figure 5 , the measurement assembly 4 comprises a mounting member 41, a roller 42 and an encoder 43, the mounting member 41 comprises a connecting structure 411 and a rotating rod 412, the connecting structure 411 comprises a magnetic suction base 4111 and a rotating support 4112 in the embodiment, the magnetic suction base 4111 is fixedly connected with the rotating support 4112, and the magnetic suction base 4111 is adsorbed and fixed on the tube plate surface 45 of the heat exchanger. The number of the rotating rods 412 is two, the two rotating rods 412 are arranged in parallel relative to each other, one end of each rotating rod 412 is rotationally connected with the rotating support 4112, and the other end is rotationally connected with the roller 42, the roller 42 is a concave wheel, the rotating rod 412 and the rotating support 4112 are connected through an elastic member 44, and the elastic member 44 is a telescopic spring in the embodiment, one end of the telescopic spring is fixedly connected with the rotating rod 412, and the other end is fixedly connected with the rotating support 4112.

[0046] At the beginning, the telescopic spring applies a pulling force to the rotating rod 412 towards the penetrating support 3, so that the roller 42 abuts against the penetrating support 3, the shell of the encoder 43 is fixedly connected with the rotating rod 412, and the rotating shaft of the encoder 43 is coaxially fixedly connected with the rotating shaft of the roller 42, so that when the penetrating support 3 is inserted into the tube bundle 1, the penetrating support 3 drives the roller 42 to rotate, and the distance of the insertion of the penetrating support 3 is measured through the encoder 43, so that the movement information of the penetrating support 3 can be accurately obtained, and the accuracy of the data acquisition in the detection process of the heat exchanger tube bundle 1 is improved. In order to position and calibrate the zero point of the encoder 43, a scale value of the reaction length is arranged on the penetrating support 3, and the encoder 43 is calibrated according to the scale value on the penetrating support 3.

[0047] With reference to Figure 6 , the embodiment also discloses a flushing catheter 51, a flushing head 52 is fixedly arranged at the front end of the flushing catheter 51, a conical surface 53 with an included angle of 45° with the axis of the flushing head 52 is arranged at the front end of the flushing head 52, four flushing openings 54 in communication with the flushing catheter 51 are arranged on the conical surface 53, and the flushing catheter 51 is connected with a high-pressure water pump. The flushing catheter 51 and the flushing head 52 are inserted into the tube bundle 1, high-pressure water flows out of the flushing openings 54, and impurities on the inner hole wall of the tube bundle 1 are cleaned.

[0048] The implementation principle of the embodiment 1 is as follows: when the tube bundle 1 of the heat exchange tube is detected, the detection probe assembly 2 is penetrated into the tube bundle 1 by the penetrating support 3, water is continuously supplied to the water storage space 25 formed by the first stop block 23, the second stop block 24 and the tube bundle 1 through the water supply pipe 22, and the PA probe 21 detects the tube bundle 1 in the circumferential direction with water as the coupling medium, so that a large-volume water pool for a large heat exchanger can be avoided, the detection cost is reduced, and the convenience and applicability of detection are improved.

[0049] Embodiment 2 With reference to Figure 7 , Figure 8 The difference between the embodiment and the embodiment 1 is that the first sealing assembly 6 is arranged on the first stop block 23, the first sealing assembly 6 seals the gap between the first stop block 23 and the inner wall of the tube bundle 1, the second sealing assembly 7 is arranged on the second stop block 24, and the second sealing assembly 7 seals the gap between the second stop block 24 and the inner wall of the tube bundle 1.

[0050] With reference to Figure 8 , Figure 9The first sealing assembly 6 in the embodiment includes a first elastic sealing layer 61 and a second elastic sealing layer 62. Both the first elastic sealing layer 61 and the second elastic sealing layer 62 are made of rubber. A sealing cavity 63 is formed in the first block 23. The sealing cavity 63 includes an annular groove 631 and an extrusion cavity 632. The annular groove 631 is arranged on the outer circumferential surface of the first block 23. Correspondingly, the drainage channel 26 in the embodiment is arranged inside the first block 23. The drainage channel 26 is independent of the annular groove 631. The first elastic sealing layer 61 covers the opening of the annular groove 631 to block the opening of the annular groove 631. The number of the extrusion cavities 632 is two. The two extrusion cavities 632 are symmetrically arranged along the axis of the first block 23. One end of the extrusion cavity 632 is in communication with the annular groove 631, and the other end penetrates to the side of the first block 23 away from the PA probe 21. The second elastic sealing layer 62 covers the extrusion cavity 632 to block the opening of the extrusion cavity 632. The second elastic sealing layer 62 is spaced apart from the port of the extrusion cavity 632 by a certain distance. The sealing cavity 63 forms a closed environment under the blocking of the first elastic sealing layer 61 and the second elastic sealing layer 62. Initially, a certain pressure of inert gas is introduced into the sealing cavity 63. The first elastic sealing layer 61 and the second elastic sealing layer 62 do not have outward convex deformation.

[0051] With reference to Figure 9 , Figure 10 The first block 23 is provided with an extrusion piece 64. The extrusion piece 64 in the embodiment includes a connecting rod 641 and an extrusion plate 642. The connecting rod 641 is slidably arranged in the center of the first block 23. The extrusion plate 642 is fixedly connected with the connecting rod 641 and is located on the side of the first block 23 away from the PA probe 21. An extrusion rod 643 is fixedly arranged on the extrusion plate 642. The extrusion rod 643 corresponds to the extrusion cavities 632 and is inserted into the corresponding extrusion cavities 632. The diameter of the extrusion rod 643 is smaller than the diameter of the extrusion cavities 632. One end of the connecting rod 641 is connected with the PA probe 21 through a PPR insert joint.

[0052] Under the water pressure of the water storage space 25, the first block 23 moves towards the extrusion plate 642 to make the extrusion rod 643 on the extrusion plate 642 extrude the second elastic sealing layer 62, so as to make the first elastic sealing layer 61 outwardly convex to the first block 23, enhance the sealing effect of the first block 23 and the inner wall of the tube bundle 1, and reduce the water leakage of the water storage space 25. No additional action is needed to extrude the second elastic sealing layer 62, thereby improving the convenience of the sealing of the first elastic sealing layer 61.

[0053] With reference to Figure 9 , Figure 10The base 651 is fixed on the connecting rod 641 and is arranged opposite to the side of the first block 23 close to the PA probe 21. Four extrusion springs 652 are fixed on the side of the base 651 close to the first block 23. The four extrusion springs 652 are evenly arranged along the circumference of the connecting rod 641. The other ends of the extrusion springs 652 are fixed with a mounting ring 653. The mounting ring 653 is sleeved on the connecting rod 641. Two stop rods 654 are hingedly connected to the base 651. The two stop rods 654 are symmetrically arranged about the connecting rod 641 and are located inside the four extrusion springs 652. The rotation plane of the stop rod 654 is coplanar with the axis of the connecting rod 641.

[0054] With reference to Figure 9 , Figure 10 The control sleeve 655 is fixed on the first block 23 and is sleeved on the connecting rod 641 and is in sliding connection with the connecting rod 641. The control block 656 is arranged on each stop rod 654 and is opposite to the control sleeve 655. When the control block 656 abuts against the control sleeve 655, the two stop rods 654 form an eight-shaped structure with the opening facing the first block 23. The mounting ring 653 abuts against the side of the two stop rods 654 away from the first block 23. At this time, the extrusion springs 652 are in the compressed state. When the first block 23 moves towards the extrusion plate 642 under the water pressure, the control block 656 is separated from the control sleeve 655. The two stop rods 654 rotate towards the connecting rod 641, so that the stop rod 654 releases the blockage of the mounting ring 653. The extrusion springs 652 are elongated and contact the first block 23 and apply a pushing force to the first block 23.

[0055] With reference to Figure 8 , Figure 11 and Figure 12 The second sealing assembly 7 comprises a third elastic sealing layer 71. The annular sealing groove 72 is arranged on the surface of the circumferential wall of the second block 24. The drainage channel 26 on the corresponding second block 24 is embedded in the second block 24 and is independent of the annular sealing groove 72. The third elastic sealing layer 71 covers the opening of the annular sealing groove 72 and seals the opening of the annular sealing groove 72. The gas supply pipe 73 is embedded in the support 3 and is arranged in communication with the annular sealing groove 72. The gas supply pipe 73 is connected with a gas pump and delivers gas to the annular sealing groove 72. As the pressure of the annular sealing groove 72 increases, the third elastic sealing layer 71 protrudes outward from the second block 24 and seals the gap between the second block 24 and the tube bundle 1.

[0056] The implementation principle of embodiment 2 is that when the tube bundle 1 is detected, the water supply pipe 22 supplies water to the water storage space 25, as the water in the water storage space 25 gradually increases, the water pressure pushes the first stop block 23 to slide towards the pressing plate 642, the first stop block 23 drives the control sleeve 655 to be separated from the control block 656, so that the stop rod 654 releases the block of the mounting ring 653, the pressing spring 652 is pushed towards the first stop block 23, and the first stop block 23 is pressed, so that the extrusion rod 643 on the extrusion plate 642 extrudes the second elastic sealing layer 62 towards the extrusion cavity 632, so that the inner product of the sealing cavity 63 is reduced, the gas pressure cavity is increased, the gas pushes the first elastic sealing layer 61 to protrude outwards the first stop block 23, and the gap between the first stop block 23 and the tube bundle 1 is sealed. At the same time, the gas pump inflates the annular groove 631, so that the third elastic sealing layer 71 protrudes outwards the second stop block 24, and the gap between the second stop block 24 and the tube bundle 1 is sealed. The first elastic sealing layer 61 and the third elastic sealing layer 71 seal the gaps between the first stop block 23, the second stop block 24 and the inner wall of the tube bundle 1 respectively, so as to avoid water leakage in the water storage space 25, ensure the stability of the PA probe 21 detection process using water as the coupling medium, and improve the detection accuracy.

[0057] Embodiment 3 The embodiment discloses a PA imaging detection method for corrosion conditions of a tube bundle of a heat exchanger.

[0058] The PA imaging detection method for corrosion conditions of a tube bundle of a heat exchanger uses the PA imaging detection device for corrosion conditions of a tube bundle of a heat exchanger, and comprises the following steps. S1, device connection, connecting interfaces of parts of the device, checking states of components, checking a detection system, and testing whether water pressure control is intact.

[0059] S2, tube bundle 1 cleaning, inserting the flushing conduit 51 into the tube bundle 1, opening a high-pressure outlet, controlling water pressure from low to high, and pushing and pulling back the flushing conduit 51 until the overflow water is clear.

[0060] S3, detection sensitivity calibration, inserting the detection probe assembly 2 into the tube bundle 1, calibrating using intact parts of the tube bundle 1, opening the water supply pipe 22 to supply water to the water storage space 25, observing a scanning image and an A-scan waveform, adjusting a sound path, adjusting the outer wall echo of the tube bundle 1 to 70%-80% of the sound path range, setting a focus depth, setting the focus point to the inner wall of the tube bundle 1, adjusting the gain, and adjusting the inner wall amplitude of the tube bundle 1 to 70%-80% of the full screen.

[0061] S4, encoder 43 calibration, entering an encoder 43 setting interface, setting a step distance of the encoder 43, generally 1 mm, and setting 0.5 mm when detecting key parts; calibrating the encoder 43, observing the scale value on the support 3, pushing the probe 1 m forward, and clicking the self-calibration button.

[0062] S5 Implementation of detection, insert the detection probe assembly 2 into the tube bundle 1, open the water supply pipe 22 to supply water to the water storage space 25, enter the scanning interface, click start scanning, slowly push forward through the support 3, and observe the scanning image at the same time. If poor coupling or scanning disconnection occurs, adjust the water pressure or pull back and advance to cover the disconnected part.

[0063] S6 Result evaluation, determine the corrosion area according to the scanning image, and determine the corrosion depth according to the corresponding area A scanning waveform.

[0064] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A PA imaging detection device for corrosion status of heat exchanger tube bundles, characterized in that: It includes a detection probe assembly (2) and a through-support member (3). The detection probe assembly (2) is connected to the through-support member (3) and can be inserted into the tube bundle (1). The through-support member (3) is used to drive the detection probe assembly (2) to move within the tube bundle (1). The detection probe assembly (2) includes a PA probe (21), a water supply pipe (22), a first stop (23), and a second stop (24). The first stop (23) and the second stop (24) are both connected to the through support member (3) and are adapted to the inner hole of the tube bundle (1). They are spaced apart to form a water storage space (25) with the tube bundle (1). The PA probe (21) is located in the water storage space (25) and is connected to the first stop (23) and the second stop (24). The PA probe (21) can detect the circumference of the tube bundle (1). The water supply pipe (22) is inserted on the second stop (24) and can communicate with the water storage space (25) to continuously supply water to the water storage space (25).

2. The PA imaging detection device for heat exchanger tube bundle corrosion status according to claim 1, characterized in that: Both the first block (23) and the second block (24) are provided with drainage channels (26). One end of the drainage channel (26) is connected to the water storage space (25), and the other end is connected to the outside.

3. The PA imaging detection device for heat exchanger tube bundle corrosion status according to claim 1, characterized in that: It also includes a measuring component (4), which includes a mounting component (41), a roller (42), and an encoder (43). The mounting component (41) can be detachably mounted and fixed on the heat exchanger. The roller (42) is rotatably connected to the mounting component (41) and can abut against the through support (3). The through support (3) can drive the roller (42) to rotate. The encoder (43) is disposed on the mounting component (41) and connected to the roller (42).

4. The PA imaging detection device for heat exchanger tube bundle corrosion status according to claim 3, characterized in that: The mounting component (41) includes a connecting structure (411) and a rotating rod (412). The connecting structure (411) is connected to the heat exchanger, and the rotating rod (412) is rotatably connected to the connecting structure (411). The roller (42) and the encoder (43) are both mounted on the rotating rod (412). The connecting structure (411) is provided with an elastic element (44) connected to the rotating rod (412). The elastic element (44) can pull the roller (42) to abut against the through support (3).

5. The PA imaging detection device for heat exchanger tube bundle corrosion status according to claim 4, characterized in that: The first stop (23) is provided with a first sealing component (6), which can seal the gap between the first stop (23) and the inner wall of the tube bundle (1). The second stop (24) is provided with a second sealing component (7), which can seal the gap between the second stop (24) and the inner wall of the tube bundle (1).

6. The PA imaging detection device for heat exchanger tube bundle corrosion status according to claim 5, characterized in that: The first sealing assembly (6) includes a first elastic sealing layer (61) and a second elastic sealing layer (62). A sealing cavity (63) is provided inside the first stop (23). One end of the sealing cavity (63) extends through to the peripheral wall of the first stop (23). The first elastic sealing layer (61) covers the end of the sealing cavity (63) located on the peripheral wall of the first stop (23). The second elastic sealing layer (62) covers the other end of the sealing cavity (63) so that the sealing cavity (63) forms a sealed space. A pressing member (64) is provided on the first stop (23). The pressing member (64) can press the second elastic sealing layer (62) so that the first elastic sealing layer (61) can protrude outward from the first stop (23).

7. The PA imaging detection device for heat exchanger tube bundle corrosion status according to claim 6, characterized in that: The extrusion member (64) includes a connecting rod (641) and an extrusion plate (642). The connecting rod (641) is fixedly connected to the PA probe (21). The connecting rod (641) slides through the first stop (23). The extrusion plate (642) is fixedly connected to the connecting rod (641) and is located on the side of the first stop (23) away from the PA probe (21). The first stop (23) can move toward the extrusion plate (642) under the water pressure of the water storage space (25), so that the extrusion plate (642) can extrude the second elastic sealing layer (62).

8. The PA imaging detection device for corrosion status of heat exchanger tube bundles according to claim 7, characterized in that: The connecting rod (641) is provided with a base (651), which is located between the first stop (23) and the PA probe (21). The base (651) is provided with a compression spring (652), which can compress the first stop (23) toward the compression plate (642).

9. The PA imaging detection device for heat exchanger tube bundle corrosion status according to claim 8, characterized in that: A stop bar (654) is hinged to the base (651). The stop bar (654) can prevent the compression spring (652) from extending. A control block (656) is provided on the stop bar (654). A control sleeve (655) is fixedly provided on the first stop block (23). When the control block (656) contacts the control sleeve (655), the stop rod (654) can prevent the compression spring (652) from extending; when the control block (656) disengages from the control sleeve (655), the stop rod (654) releases its obstruction of the compression spring (652).

10. A PA imaging detection method for corrosion condition of heat exchanger tube bundle (1), using the PA imaging detection device for corrosion condition of heat exchanger tube bundle according to any one of claims 1-9, characterized in that: Includes the following steps: S1 device connection; S2 tube bundle (1) cleaning, the inner hole of tube bundle (1) is cleaned; S3 detection sensitivity calibration: Insert the detection probe assembly (2) into the tube bundle (1), use the intact part of the tube bundle (1) for calibration, open the water supply pipe (22) to supply water to the water storage space (25), observe the scanning image and A-scan waveform, adjust the sound path, set the focus depth, set the focus to the inner wall of the tube bundle (1), and adjust the gain; S4 encoder (43) calibration: Enter the encoder (43) setting interface and set the encoder (43) step speed; S5 performs the test, inserts the test probe assembly (2) into the tube bundle (1), opens the water supply pipe (22) to supply water to the water storage space (25), enters the scanning interface, clicks to start scanning, slowly pushes the tube forward, and observes the scanning image at the same time. If poor coupling or scanning line breakage occurs, adjust the water pressure or pull back and push forward to cover the broken line part. S6 results evaluation: The corrosion area is determined based on the scanned image, and the corrosion depth is determined based on the A-scan waveform of the corresponding area.

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