Phased array electronic automatic scanning detection device for welding seam of tube and tube plate

Abstract

The utility model discloses a pipe and pipe plate weld phased array electronic automatic scanning detection device which comprises a probe body, a water sealing cap and a water sealing cover, sealing is formed through a rubber pad and a rubber ring, and a water-filled sealing cavity is formed below the water sealing cap, above the water sealing cover and on the inner wall of a heat exchange pipe. Water circulation can be achieved through a water inlet and a water outlet formed in the top of the water sealing cap, phased array acoustic beams are emitted by exciting the circumferential wafer, and the phased array acoustic beams are circumferentially spread to a detected part through medium water in the sealing cavity. By means of the scheme, coupling of the probe and the detected part is well achieved, deformation of the heat exchange tube can be adapted within a certain range, and phased array automatic detection of the heat exchange tube and the tube plate fillet weld can be achieved through electronic scanning without rotating the probe.

Description

Technical Field

[0001] This utility model relates to the field of non-destructive testing technology, and in particular to a phased array scanning testing device for weld seams between heat exchanger tubes and tube sheets. Background Technology

[0002] The weld between heat exchanger tubes and tubesheets is a unique welded structure used in heat exchangers of petroleum refining plants. In recent years, due to frequent leakage accidents during use, the requirements for non-destructive testing of this structure have become increasingly stringent. However, conventional ultrasonic testing or conventional radiographic testing cannot effectively detect its internal structure. In recent years, rod-anode radiographic testing has been mainly used to detect internal defects in the fillet welds of heat exchanger tubes and tubesheets. However, rod-anode radiographic testing is time-consuming, costly, and inefficient. Therefore, many domestic institutions have conducted systematic research on phased array testing technology for fillet welds of heat exchanger tubes and tubesheets, achieving significant breakthroughs and results, especially in the development of phased array probe systems and the verification of test results. The phased array testing process has revealed many problems. The probe needs to rotate a full circle inside the heat exchanger tube to complete the inspection. Many heat exchanger tubes are deformed during manufacturing or use, making it impossible to insert the probe inside. Therefore, based on the common defect characteristics of heat exchanger tube and tubesheet welds, it is necessary to develop a testing device that can adapt to the dimensional deformation characteristics of heat exchanger tubes and is fast and efficient without requiring probe rotation. Utility Model Content

[0003] This invention provides a phased array scanning detection device for fillet welds between heat exchanger tubes and tube sheets. Through this invention, the coupling between the probe and the part being detected is better achieved, and it can adapt to the deformation of the heat exchanger tube within a certain range. The phased array detection of fillet welds between heat exchanger tubes and tube sheets can be achieved through electronic scanning without rotating the probe.

[0004] This utility model provides the following technical solution to achieve the above objectives:

[0005] An automatic phased array electronic scanning inspection device for tube-to-tube sheet weld seams, comprising a probe body, a water-sealing cap, and a water-sealing cover, wherein:

[0006] The water-sealing cap has an axial through hole in the middle, and the hole wall is fitted to the outer peripheral side wall of the probe body. The bottom surface of the water-sealing cap is provided with a rubber pad, which is annular and surrounds the probe body. The rubber pad is used to contact the end face of the heat exchange tube and seal the heat exchange tube opening. The area of ​​the water-sealing cap that is smaller than the inner diameter of the heat exchange tube and larger than the probe body is provided with a water inlet and a water outlet, which connect the top and bottom of the water-sealing cap.

[0007] The water-sealing cover has an circumferential groove on its outer periphery, and a rubber ring is embedded in the circumferential groove;

[0008] The probe body below the water-sealing cap is equipped with a circumferential crystal, which is arranged circumferentially on the probe frame. The probe frame and the water-sealing cap are detachably and securely connected.

[0009] The circumferential wafer has a probe lead wire inside, which extends outward from the probe body and connects to the detection equipment;

[0010] The probe body, water-sealing cap, and water-sealing cover are connected as a whole, forming an effective seal through rubber pads and rubber rings. The area below the water-sealing cap, above the water-sealing cover, and the inner wall of the heat exchange tube form a water-fillable space. After the inlet and outlet are connected to an external water supply device, water flows into the water-fillable space and then flows out of the water-fillable space, forming a cycle. The phased array sound beam is emitted by exciting the circumferential crystal and propagates circumferentially through the medium water.

[0011] The probe body and the water-sealing cap are connected together by adhesive bonding.

[0012] The probe frame and the water seal cover are connected by screws. The probe frame has three screw holes, and the water seal cover has three through holes. The screw holes correspond to the through holes.

[0013] The probe body includes a waterproof gland, and the top of the waterproof gland has a probe lead-out port from which the probe lead-out wire extends.

[0014] The circumferential wafer is arranged on the upper half of the probe frame, and the width of the wafer is adjusted according to the weld to be inspected.

[0015] The rubber pad is bonded to the bottom of the water-sealing cap.

[0016] There are three rubber rings.

[0017] Compared with existing phased array detection technologies, the advantages of this invention are:

[0018] Water coupling reduces the risk of poor coupling and undetectable issues caused by variations in heat exchanger tube dimensions. It also reduces the need for high cleanliness of the heat exchanger tube's inner wall, making it more suitable for in-service inspection. A single electronic scan can complete an automatic phased array inspection of the heat exchanger tube and tubesheet fillet weld, eliminating the need for probe rotation. Inspection time is short, and inspection efficiency is high. Components are easy to replace, saving costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the device of this utility model;

[0020] Figure 2 This is a schematic diagram of the device from another angle.

[0021] Figure 3 This is a schematic diagram of the end face where the rubber pad of the water-sealing cap of this utility model is located;

[0022] Figure 4 This is a schematic diagram of the end face of the water-sealing cap of this utility model;

[0023] Figure 5 This is a schematic diagram of the probe frame structure of this utility model;

[0024] Figure 6 This is a schematic diagram of one end of the screw hole of the probe frame of this utility model;

[0025] Figure 7 This is a schematic diagram of the assembly and testing status of the device and heat exchange tube of this utility model. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] This invention relates to a phased array electronic automatic detection device for weld seams between heat exchanger tubes and tube sheets.

[0028] like Figure 1 The image shows an automatic phased array scanning inspection device for the weld seams of heat exchanger tubes and tube sheets. This device consists of three parts: a probe body 1, a water-sealing cap 3, and a water-sealing cover 8. The probe body 1 and the water-sealing cap 3 are bonded together as a single unit via rubber gaskets 4. The probe body 1 and the water-sealing cover 8 are connected as a single unit via rubber rings 7 on the water-sealing cover and three sets of screws. This assembly allows for easy disassembly and assembly. Damaged rubber gaskets 4 and rubber rings 7 can be replaced promptly, and damaged circumferential crystals 5 can be replaced without disassembly.

[0029] like Figure 1 The probe body 1 includes a waterproof gland 2, a circumferential wafer 5, and a probe frame 6. The top of the waterproof gland has a probe lead-out port, and the internal probe lead-out wire is connected to the circumferential wafer 5. The end of the probe lead-out wire that extends outside the device is connected to the detection equipment.

[0030] like Figure 2 This is another angle of the device of this utility model, showing the inlet 10 and the outlet 11.

[0031] like Figure 3 This utility model discloses a water-sealing cap 3, which includes a rubber pad 4, a water inlet 10, and a water outlet 11. The water inlet 10 and the water outlet 11 are located in an area of ​​the water-sealing cap 3 that is smaller than the inner diameter of the heat exchange tube 30 but larger than the probe body 1. The water inlet 10 and the water outlet 11 extend downwards to connect the top and bottom of the water-sealing cap 3. In use, it is connected to an external water supply device to achieve water circulation. The water-sealing cap 3 has an axial through hole in the middle, and the hole wall is sleeved and bonded to the outer peripheral side wall of the probe body 1. The rubber pad 4 is bonded to the bottom surface of the water-sealing cap 3. The rubber pad 4 is annular and surrounds the probe body 1. The rubber pad 4 is used to contact the end face of the heat exchange tube 30 and seal the opening of the heat exchange tube 30.

[0032] like Figure 4 This utility model relates to a water-sealing cap. The water-sealing cap 8 has a circumferential groove on its outer periphery, and three sets of rubber rings 7 are embedded in the groove to better seal the water from leakage. The water-sealing cap 8 also has three through holes for installing screws. The probe frame 6 has three screw holes, corresponding to the through holes, for connection to the probe frame 6 using screws. The probe frame 6 is a component of the probe body 1.

[0033] like Figure 5 The probe frame 6 of this utility model has circumferentially arranged wafers 5 in the upper half of the probe frame 6. The wafers can be arranged in 128 or 256 according to the inner diameter of the heat exchange tube.

[0034] like Figure 7 This is a schematic diagram of the actual testing of the present invention with the heat exchange tube in the assembly state. The test tube plate 20 and the heat exchange tube 30 are welded together to form a weld seam 25. When testing, the device is placed inside the heat exchange tube 30. The test device with a suitable outer diameter needs to be selected according to the inner diameter of the heat exchange tube.

[0035] The specific testing process for this utility model is as follows:

[0036] Step 1: Insert the device into the heat exchange tube 30, with the circumferential wafer 5 corresponding to the weld seam 25. At this time, the rubber ring gasket 4 abuts against the upper edge of the heat exchange tube 30, and the three sets of rubber rings 7 are tightly fitted to the inner wall of the heat exchange tube 30. An effective seal is formed by the rubber gasket 4 and the rubber rings 7. The water sealing cap 3 below, the water sealing cover 8 above, and the inner wall of the heat exchange tube 30 form a water-fillable sealed cavity.

[0037] Step 2: Connect the inlet 10 and outlet 11 to the water supply device. Water flows into the fillable space and then flows out of the fillable space, forming a water circulation (the inlet 10 and outlet 11 are inserted into the tube with the rubber head, and the tube is used to transport water. The rubber head is inserted to meet the water pressure requirements. The connection is tight and will not be forced out). Water 40 is in the sealed cavity.

[0038] Step 3: Lead the circumferential wafer probe lead wire out from the probe lead wire port at the top of the waterproof gland 2 and connect it to the phased array detection instrument;

[0039] Step 4: Adjust the detection process parameters and start the detection: Excite 4-8 wafers in the circumferential direction at a time. The wafers emit phased array sound beams, which penetrate the water in the sealed cavity and propagate to the weld seam 25. At the same time, step one wafer. After one excitation, continue to excite the next batch of wafers until all the wafers in a circle have been excited once, and the detection is completed. Because the emission pulse frequency is high, the detection time is very short. Generally, the detection is completed after clicking the detection button.

[0040] Explanation of the detection effect of this utility model:

[0041] This invention relates to the inspection of tube-to-tube sheet welds in an in-service sulfur cooler. Its inspection efficiency is more than 50% higher than that of phased array technology requiring rotating probes. Of the 4026 tube-to-tube sheet welds requiring inspection, 4020 were inspected, with the remaining 6 showing significant deformation. Conventional phased array technology using rotating probes, due to the need for higher coupling, can only inspect 3956 welds. Both methods demonstrate comparable defect detection capabilities and meet the requirements for use.

[0042] The technology involved in this utility model is different from the common rotating probe scanning cases in the market. It should be noted that any equivalent improvement of such electronic automatic scanning is within the scope of protection of this technology.

Claims

1. A phased array electronic automatic scanning and inspection device for tube-to-tube sheet weld seams, characterized in that: It includes the probe body (1), the water-sealing cap (3), and the water-sealing cover (8), wherein: The water-sealing cap (3) has an axial through hole in the middle, and the hole wall is fitted and connected to the outer peripheral side wall of the probe body (1). The bottom surface of the water-sealing cap (3) is provided with a rubber pad (4). The rubber pad (4) is annular and surrounds the probe body (1). The rubber pad (4) is used to contact the end face of the heat exchange tube (30) and seal the opening of the heat exchange tube (30). The area of ​​the water-sealing cap (3) smaller than the inner diameter of the heat exchange tube (30) and larger than the probe body (1) is provided with an inlet (10) and an outlet (11). The inlet (10) and the outlet (11) connect the top and bottom of the water-sealing cap (3). The water-sealing cap (8) has an circumferential groove on its outer periphery, and a rubber ring (7) is embedded in the circumferential groove. The probe body (1) below the water-sealing cap (3) is provided with a circumferential crystal (5). The circumferential crystal (5) is arranged on the probe frame (6) along the circumferential direction. The probe frame (6) and the water-sealing cap (8) are detachably fastened together. The circumferential wafer (5) has a probe lead wire inside, which extends outward from the probe body (1) and connects to the detection device; The probe body (1), the water-sealing cap (3) and the water-sealing cover (8) are connected as a whole, and an effective seal is formed by the rubber pad (4) and the rubber ring (7). The water-sealing cap (3) below, the water-sealing cover (8) above, and the inner wall of the heat exchange tube (30) form a water-fillable space. The water inlet (10) and the water outlet (11) are connected to an external water supply device.

2. The phased array electronic automatic scanning and inspection device for tube and tube sheet welds according to claim 1, characterized in that: The probe body (1) and the water-sealing cap (3) are connected together by adhesive bonding.

3. The phased array electronic automatic scanning and inspection device for tube and tube sheet welds according to claim 1, characterized in that: The probe frame (6) and the water seal cover (8) are connected by screws. The probe frame (6) has three screw holes and the water seal cover (8) has three through holes. The screw holes correspond to the through holes.

4. The phased array electronic automatic scanning and inspection device for tube and tube sheet welds according to claim 1, characterized in that: The probe body (1) includes a waterproof gland (2), and the top of the waterproof gland (2) has a probe lead wire port, from which the probe lead wire extends.

5. The phased array electronic automatic scanning and inspection device for tube and tube sheet welds according to claim 1, characterized in that: The circumferential wafer (5) is arranged on the upper half of the probe frame (6), and the width of the wafer is adjusted according to the weld to be inspected.

6. The phased array electronic automatic scanning and inspection device for tube and tube sheet welds according to claim 1, characterized in that: The rubber pad (4) is bonded to the bottom surface of the water-sealing cap (3).

7. The phased array electronic automatic scanning and inspection device for tube and tube sheet welds according to claim 1, characterized in that: The rubber ring (7) is provided in three parts.

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