A magnetic memory detection probe for high-temperature pressure pipelines

Abstract

This invention discloses a magnetic memory detection probe for high-temperature pressure pipelines, comprising a housing, a heat sink, an air duct, a fan, and a magnetic memory probe. The heat sink is fixedly installed inside the housing, and a top-to-bottom air-cooling channel is formed within the heat sink. A cooling element is installed at the upper end of the air-cooling channel within the heat sink, and the magnetic memory probe is installed at the bottom of the air-cooling channel within the heat sink. One end of the air duct is connected to the fan, and the other end passes through the upper cover of the housing and is located at the upper end of the cooling element. This invention uses a fan to provide cooling air to the interior of the housing. After being cooled by the cooling element, the cooling air further improves the cooling effect and is blown towards the magnetic memory probe through the air-cooling channel in the heat sink, thereby suppressing the temperature rise of the magnetic memory probe itself and enabling rapid magnetic memory detection of stress and fatigue damage in high-temperature pressure pipelines under in-service conditions.

Description

Technical Field

[0001] This invention relates to the field of nondestructive testing technology, specifically to a magnetic memory testing probe for high-temperature pressure pipelines. Background Technology

[0002] High-temperature pressure pipelines are a common and critical component in industry. Firstly, with rapid technological advancements, their applications are becoming increasingly widespread, particularly in thermal power plants, chemical plants, and oil companies. Secondly, the inherent safety of high-temperature pressure pipelines is receiving increasing attention. Repeated cycles of high and low pressure, temperature fluctuations, and volume expansion and contraction easily lead to stress concentration. Finally, they often transport toxic, flammable, or explosive substances, which can cause erosion and corrosion, resulting in major accidents such as toxic gas leaks and pipeline explosions. Therefore, high-temperature pressure pipelines are consistently high-risk, high-consequence monitoring targets. In addition to periodically inspecting material loss, rapid scanning for stress and fatigue damage is particularly crucial.

[0003] Stress and fatigue damage measurement techniques currently fall into two main categories: ultrasonic and electromagnetic. The principle behind ultrasonic stress and fatigue damage detection techniques is based on the propagation characteristics of ultrasound waves. Research has found that when ultrasound waves propagate through the same material, their propagation speed changes if the material's stress changes. Using this known or calibrated propagation speed-stress relationship, the stress in a material can be roughly determined by measuring the propagation time (propagation speed) of the ultrasound waves over a certain distance.

[0004] As can be seen from the principles of ultrasonic internal stress and fatigue damage detection, firstly, ultrasonic waves need to be coupled into the object being tested, travel a certain distance, and then be coupled back to the ultrasonic probe; secondly, the propagation time of the ultrasonic waves needs to be accurately measured. Under laboratory conditions, or in general shutdown and waiting-for-inspection situations, careful polishing of the surface of the pressure pipe and the use of a couplant can achieve relatively good coupling of ultrasonic waves to the object being tested. However, for high-temperature pressure pipes, the surface temperature exceeds the boiling point of the couplant, generating a large number of bubbles during the testing process, which cannot effectively couple the ultrasonic waves, resulting in poor testing results.

[0005] Another commonly used stress and fatigue damage detection technique is electromagnetic testing. Fundamentally, it also utilizes the phenomenon of stress and fatigue damage altering the electromagnetic properties of a material. By determining or calibrating the electromagnetic property-stress relationship, the stress and fatigue damage of the material can be identified.

[0006] Existing magnetic memory testing probes are designed for offline testing, typically targeting objects at room temperature and without pressure. For high-temperature, high-pressure pipelines in use, neither existing ultrasonic nor magnetic memory probes can reliably perform the tests.

[0007] Utility model application CN210720250U discloses a non-destructive testing device for variable-diameter pipes. In operation, this device uses a camera and a magnetic memory probe to detect and collect data from the inner wall of the pipe. The telescopic rods are divided into several groups, with each group's rods distributed sequentially along the axial direction of the central cylinder. Within each group, the rods are distributed sequentially circumferentially, while rods in different groups are staggered. This allows the device to be self-propelled, variable-diameter, and capable of full-section scanning to meet testing requirements. However, this application still does not solve the problem of performing magnetic memory testing for stress and fatigue damage in high-temperature, high-pressure pipes. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to solve the problem that existing magnetic memory detection probes cannot successfully complete the magnetic memory detection of stress and fatigue damage in high-temperature pressure pipelines under the condition of use.

[0009] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0010] A magnetic memory detection probe for high-temperature pressure pipelines includes a housing, a heat sink, an air duct, a fan, and a magnetic memory probe.

[0011] The heat sink is fixedly installed inside the housing, and the heat sink has a top-to-bottom air cooling channel.

[0012] The cooling component is installed at the upper end of the air-cooling channel of the heat sink, and the magnetic memory probe is installed at the bottom of the air-cooling channel inside the heat sink.

[0013] The upper end of the housing is provided with a cover plate, one end of the air duct is connected to the fan, and the other end passes through the cover plate of the housing and is located at the upper end of the cooling component.

[0014] Advantages: This invention uses a fan to provide cooling air to the inside of the casing. After being cooled by the cooling components, the cooling air further improves the cooling effect and is blown to the magnetic memory probe through the air-cooling channel in the heat sink, thereby suppressing the temperature rise of the magnetic memory probe itself and realizing rapid magnetic memory detection of stress and fatigue damage in high-temperature pressure pipelines under in-service conditions.

[0015] Preferably, the heat sink includes a plurality of parallel and vertically arranged heat sinks, and the heat sinks are fixedly connected to the outer casing by point contact.

[0016] Preferably, the heat sink is a copper structural component.

[0017] Preferably, the outer casing is provided with air vents, and the plurality of air vents are respectively located on the four side walls at the bottom of the outer casing, and the plurality of air vents are all connected to the air cooling channel.

[0018] Preferably, the air duct is an insulated flexible duct, which can be constructed by wrapping a plastic duct with thermal insulation material.

[0019] Preferably, the length of the air duct is 1.5 meters.

[0020] Preferably, the housing has a cooling cavity located at the upper end of the heat sink;

[0021] The cooling chamber has a small door that can be opened on its side wall, and the small door is connected to the outer shell by a snap-fit ​​method; the cooling component is placed in the cooling chamber through the small door.

[0022] Preferably, the small door is made of a heat-insulating transparent material.

[0023] Preferably, the cooling element is dry ice.

[0024] Preferably, it also includes an external encoder; the external encoder has a housing made of thermal insulation material, and the external encoder is connected to the magnetic memory probe by a snap-fit ​​method.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] (1) The present invention uses a fan to provide cooling air to the inside of the shell. After being cooled by dry ice, the cooling air greatly improves the cooling effect and is blown to the magnetic memory probe through the air cooling channel in the heat sink, thereby suppressing the temperature rise of the magnetic memory probe itself and realizing the rapid detection of stress and fatigue damage of high temperature pressure pipeline under the condition of use.

[0027] (2) This invention uses a heat-insulating outer shell and a steel structural heat sink to better isolate the magnetic memory probe from the high temperature outside. At the same time, the outer shell and the heat sink are fixed by point contact, which further increases the heat insulation effect.

[0028] (3) This invention adopts a split fan design and uses insulated flexible pipes as air ducts to transmit cold air, avoiding the influence of high-temperature environments. The length of the air duct is set at 1.5 meters, which ensures that the fan has a cooling effect while facilitating operation by staff. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0030] Figure 2 This is an exploded view of an embodiment of the present invention;

[0031] Figure 3 This is a partial exploded view of the cooling component and the small door according to an embodiment of the present invention;

[0032] Figure 4 This is a cross-sectional view of an embodiment of the present invention;

[0033] In the diagram: 1. Outer shell; 2. Heat sink; 3. Cooling component; 4. Air duct; 5. Fan; 6. Magnetic memory probe; 11. Cover plate; 12. Air vent; 13. Cooling chamber; 14. Small door; 21. Heat sink; 51. Hanging ring; 61. Cable. Detailed Implementation

[0034] To facilitate understanding of the technical solution of the present invention by those skilled in the art, the technical solution of the present invention will now be further described in conjunction with the accompanying drawings.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] See Figure 1 and Figure 2 This embodiment discloses a magnetic memory detection probe for a high-temperature pressure pipeline, including a housing 1, a heat sink 2, a cooling component 3, an air duct 4, a fan 5, and a magnetic memory probe 6.

[0037] The outer shell 1 is made of plastic, which provides a certain degree of insulation against temperature.

[0038] See Figure 3 The outer casing 1 has openings at both the top and bottom. A plastic cover plate 11 is provided at the top of the outer casing 1 to seal the opening at the top of the outer casing 1. At the same time, the plastic cover plate 11 can be opened, so the outer casing 1 can be opened from the top, which facilitates the installation of the above-mentioned components.

[0039] The heat sink 2 is a copper structural component supported by steel with good thermal conductivity; it can be either brass or copper. The heat sink 2 is fixedly installed inside the outer casing 1, and the bottom of the heat sink 2 is flush with the bottom of the outer casing 1.

[0040] The outer casing 1 has a cooling chamber 13 located above the heat sink 2, and the cooling component 3 is placed inside the cooling chamber 13. A small door 14 is provided on one side wall of the cooling chamber 13, and the small door 14 is connected to the outer casing 1 by a snap-fit ​​mechanism, facilitating the opening and closing of the small door 14. In this embodiment, the cooling component 3 is made of dry ice. The cooling chamber 13 is made of relatively heat-insulating plastic. Meanwhile, the small door 14 is made of heat-insulating transparent material, such as plexiglass, so that the inspector can easily observe the consumption of the dry ice in the cooling chamber 13, thereby replacing the dry ice in a timely manner to ensure the cooling effect of the entire device. The small door 14 and the outer casing 1 are sealed with a sealing ring to prevent cooling air from leaking out of the small door 14. During the inspection process, the inspector first opens the small door 14, adds a piece of dry ice smaller than the cooling chamber 13 to the cooling chamber 13, then closes the small door 14, and starts the air cooler to begin cooling. During the testing process, when it is found that the dry ice in the cooling chamber 13 is almost used up, the tester can pause the test, open the small door 14, add another piece of dry ice, and then continue working.

[0041] In this embodiment, the internal space of the cooling chamber 13 is approximately 30mm × 30mm × 30mm, and its main function is to hold a small piece of dry ice. When cooling air enters from the insulated flexible duct, the cooling air is first sprayed onto the dry ice. Because the surface temperature of the dry ice is as low as -78 degrees Celsius, the dry ice can significantly reduce the temperature of the cooling air. At the same time, as the dry ice absorbs heat and sublimates, it exerts a freezing effect and is converted into gas, which is then sprayed out from the lower end of the heat sink 2 along the air cooling channel 15.

[0042] The heat sink 2 includes multiple parallel and vertically arranged heat sinks 21. The heat sink 2 is fixed to the outer shell 1 through multi-point contact. Because there are air-cooling channels 15 from top to bottom between the heat sink 2 and the outer shell 1, and between the two heat sinks 21, the point contact between the outer shell 1 and the heat sink 2 reduces the contact area between them, thus weakening the connection between the outer shell 1 and the heat sink 2. The heat conducted from the outer shell 1 to the heat sink 2 is reduced, thereby increasing the heat insulation effect. Therefore, multiple contact points can be used for fixing and connecting to ensure better heat insulation of this device. In this embodiment, the heat sink 21 is made of copper with good thermal conductivity, which can ensure that the temperature of the magnetic memory core inside is uniform and consistent, preventing high temperature from forming at the bottom of the magnetic memory probe 6 near the high-temperature pressure pipe to be tested, which could damage the magnetic sensor of the highly sensitive magnetic memory probe 6.

[0043] It should be noted that when the mechanical fixation of the probe is required to be higher, the outer shell 1 and the heat sink 2 can also be in surface contact. In this way, the heat transferred from the outer shell 1 to the heat sink 2 will increase, but the mechanical performance of the magnetic memory probe 6 will be improved.

[0044] The fan 5 is connected to the upper end of the air-cooling channel 15 via the air duct 4. One end of the air duct 4 is connected to the fan 5, and the other end passes through the cover plate 11 of the outer casing 1 and is located at the upper end of the cooling component 3. The fan 5 is powered by a lithium battery and its main function is to provide cooling air to the magnetic memory probe 6 from a distance through the air duct 4. The fan 5 is equipped with a few buttons for controlling the fan, such as a power switch, a charging port, and a fan speed adjustment button. A lifting ring 51 is also provided on the fan 5, mainly for connecting a sling to facilitate the operator's carrying of the fan 5.

[0045] In this embodiment, the air duct 4 is an insulated flexible pipe, which can be constructed by wrapping a plastic pipe with thermal insulation material. Its length is about 1.5 meters. If the length of the air duct 4 is too long, the air volume may be insufficient; if the length of the air duct 4 is not too short, it will be inconvenient to operate. At the same time, if the air drawn in by the fan 5 is too close to the high-temperature and high-pressure pipe, its own temperature will be too high, and it will lose its cooling effect.

[0046] The magnetic memory probe 6 is mounted at the bottom center of the heat sink 2. The core component of the magnetic memory probe 6—the magnetic sensor—is mounted at the bottom center of the heat sink 2, close to the lower end face of the probe, to maximize proximity to the high-temperature, high-pressure pipe to be inspected. Simultaneously, thermally conductive silicone is also provided at the bottom of the magnetic memory probe 6. Through the full contact of the thermally conductive silicone and the heat sink 2 behind it, the temperature rise of the magnetic memory probe 6 during the inspection process is effectively suppressed.

[0047] Meanwhile, the magnetic sensor is connected to the host computer via cable 61. Specifically, cable 61 passes sequentially from the magnetic sensor through the heat sink 2 and the outer casing 1 before separating from the insulating flexible tube and then connecting to the host computer.

[0048] Generally, the magnetic memory probe 6 also requires an encoder; in this embodiment, an external encoder is designed. That is, a detachable encoder is designed and fabricated on one side of the magnetic memory probe 6 using thermal insulation material. Because the encoder itself is more resistant to high temperatures, only a thermal insulation shell made of thermal insulation material is needed around the external encoder to ensure its normal operation. The external encoder and the magnetic memory probe 6 are mechanically connected via a snap-fit ​​mechanism and electrically connected via a USB connector.

[0049] It should be noted that when the temperature of the high-temperature pressure pipeline is not too high, an integrated encoder can also be used for displacement encoding to achieve near-surface stress magnetic signal detection in the high-temperature pressure pipeline. However, this approach will increase the size of the probe and reduce the effectiveness of air cooling.

[0050] In some embodiments, the housing 1 is provided with air vents 12, and multiple air vents 12 are located on the four side walls at the bottom of the housing 1. The positions of the air vents 12 are the same as those of the magnetic memory probe 6, and the air vents 12 are connected to the air-cooling channel 15. This allows cooling air to flow smoothly out of the magnetic memory probe 6. In this way, the cooling air from the fan 5 is further cooled by the cooling chamber 13, cools the heat sink 2, and finally exits from the air vents 12, forming a smooth circulation.

[0051] The working principle of this embodiment is as follows: After all components of the device are installed, dry ice is placed into the cooling chamber 13 through the small door 14 on the outer shell 1, and then the small door 14 is closed, forming a top-to-bottom air-cooling channel 15 inside the outer shell 1. After the fan 5 is turned on, air enters the outer shell 1 through the air duct 4. When passing through the dry ice, the dry ice can improve the air-cooling effect, and after passing through the heat sink 2, the cooling air acts on the magnetic memory probe 6, reducing the temperature of the magnetic memory probe 6. Finally, the cooling air is discharged from the air hole 12 at the outer shell 1 to form a circulation. Therefore, the magnetic memory probe 6 can quickly detect the magnetic memory of stress and fatigue damage in the high-temperature and high-pressure pipeline under the in-use condition. At the same time, the detected data is sent to the host computer through the signal line.

[0052] This embodiment adopts a separate fan 5 design and uses cooling air to suppress the temperature rise of the magnetic memory probe 6 itself, so as to realize the magnetic memory detection of in-service stress and fatigue damage of high-temperature pressure pipelines.

[0053] Meanwhile, a cooling chamber 13 is designed in the air-cooling channel 15 inside the outer shell 1. By placing dry ice in the cooling chamber 13, the air-cooling effect can be greatly improved, thereby realizing the rapid detection of stress and fatigue damage by magnetic memory in the in-service state of high-temperature and high-pressure pipelines.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0055] The above embodiments are merely examples of implementation methods of the invention. The scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A magnetic memory detection probe for high-temperature pressure pipelines, characterized in that: It includes a housing (1), a heat sink (2), a cooling component (3), an air duct (4), a fan (5), and a magnetic memory probe (6); The heat sink (2) is fixedly installed inside the outer shell (1). The heat sink (2) has a top-to-bottom air cooling channel (15). The heat sink (2) includes multiple parallel and vertically arranged heat sinks (21). The heat sinks (21) are fixedly connected to the outer shell (1) by point contact. The heat sink (2) is a copper structural component. The outer shell (1) is provided with air holes (12). Multiple air holes (12) are located on the four side walls at the bottom of the outer shell (1). Multiple air holes (12) are connected to the air cooling channel (15). The cooling component (3) is installed at the upper end of the air cooling channel (15) of the heat sink (2). The magnetic memory probe (6) is installed at the bottom of the air cooling channel (15) inside the heat sink (2). The upper end of the outer shell (1) is provided with a cover plate (11). One end of the air duct (4) is connected to the fan (5), and the other end passes through the cover plate (11) and is located at the upper end of the cooling component (3).

2. The magnetic memory detection probe for high-temperature pressure pipelines according to claim 1, characterized in that: The air duct (4) is an insulated thermal duct, which is made by wrapping the plastic duct with thermal insulation material.

3. The magnetic memory detection probe for high-temperature pressure pipelines according to claim 1, characterized in that: The length of the air duct (4) is 1.5 meters.

4. The magnetic memory detection probe for high-temperature pressure pipelines according to claim 1, characterized in that: The outer casing (1) has a cooling chamber (13) located at the upper end of the heat sink (2); a small door (14) that can be opened is provided on the side wall of the cooling chamber (13), and the small door (14) is connected to the outer casing (1) by a snap-fit ​​method; the cooling component (3) is placed in the cooling chamber (13) through the opened small door (14).

5. The magnetic memory detection probe for high-temperature pressure pipelines according to claim 4, characterized in that: The small door (14) is made of heat-insulating transparent material.

6. The magnetic memory detection probe for high-temperature pressure pipelines according to claim 1, characterized in that: The cooling component (3) uses dry ice.

7. The magnetic memory detection probe for high-temperature pressure pipelines according to claim 1, characterized in that: It also includes an external encoder; the external encoder is connected to the magnetic memory probe (6) by a snap-fit ​​method.

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