A device for testing the heat conduction performance of a round tubular metal thermal insulation layer

Abstract

This utility model discloses a testing device for the thermal conductivity of a tubular metal insulation layer, including a measuring tube, a first testing component on the measuring tube, and a second testing component on the first testing component. The first and second testing components work together to achieve efficient and accurate testing of the thermal conductivity of the tubular metal insulation layer. The first testing component provides a stable heat source through a main heater and an auxiliary heater, and uses a temperature regulator and a silicon controlled rectifier voltage regulator to achieve precise temperature control, ensuring that the temperature difference remains stable within the design range during the experiment. The second testing component uses a motor-driven rotating mechanism to dynamically measure the temperature along the evenly distributed temperature measurement points on the measuring tube, thereby covering more key areas and improving the comprehensiveness and accuracy of the test results. This not only improves the testing efficiency but also enhances the adaptability of the device, meeting the testing needs of tubular metal insulation layers of different specifications and materials.

Description

Technical Field

[0001] This utility model relates to the field of thermal conductivity testing technology, specifically to a device for testing the thermal conductivity of a cylindrical metal insulation layer. Background Technology

[0002] Tubular metal insulation is a widely used insulation structure in nuclear power plants, industrial pipelines, and high-temperature equipment. Its main function is to reduce heat transfer, maintain stable internal and external temperatures, and improve system energy efficiency and safety. Tubular metal insulation typically consists of multiple layers, including an outer metal shell and an inner insulation material, which may contain reflective fillers or thermal insulation materials. Its thermal conductivity directly affects the thermal efficiency and operating costs of the equipment; therefore, accurate testing of the thermal conductivity of tubular metal insulation is crucial. To verify whether the performance of the metal insulation meets design requirements, specialized testing equipment is usually required to perform thermal conductivity tests.

[0003] Tubular metal insulation layers have been widely used in the industrial field, but there are still some shortcomings in the testing technology for their thermal conductivity. Existing testing methods mostly rely on imported equipment or traditional testing devices. These devices are not only expensive, but also have certain limitations in terms of testing accuracy and applicability. In addition, when measuring the stability of heat transfer under high temperature conditions, existing devices are often affected by ambient temperature fluctuations, heat loss, and insufficient testing accuracy, resulting in large errors in the test results. At the same time, some testing equipment has a complex structure and is difficult to operate, making it difficult to meet the testing needs of tubular metal insulation layers of different specifications and materials.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a test device for the thermal conductivity of a circular tubular metal insulation layer, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows: A test device for the thermal conductivity of a circular tubular metal insulation layer includes a measuring tube, a test component one disposed on the measuring tube, and a test component two disposed on the test component one. The test component one includes a test part and a connecting part. The test part is disposed on the measuring tube, and the connecting part is disposed at both ends of the measuring tube. The test component two is disposed on the connecting part.

[0007] Furthermore, the test component includes cavities that are equidistantly located inside the measuring tube. One cavity contains a main heater, and the other two cavities contain auxiliary heaters. Temperature measuring slits are equidistantly located on the measuring tube and are connected to the cavities. Temperature regulators are located inside the temperature measuring slits.

[0008] Furthermore, the measuring tube is equipped with heat insulation and protection structures at equal intervals on its exterior. The temperature regulator is connected to a thyristor voltage regulator via wires. The auxiliary heater is connected to a thyristor via wires. The main heater is connected to a resistor via wires. Both the thyristor and the resistor are connected to a regulated power supply and a DC regulated power supply via wires. The thyristor is electrically connected to the connection terminal of the regulated power supply via wires.

[0009] Furthermore, the connecting component includes an end plate, which is disposed at one end of one of the two thermal insulation and protection structures. The end plate is provided with fixing bolts, and the fixing bolts are threadedly connected to the thermal insulation and protection structure.

[0010] Furthermore, the second test component includes a motor, which is fixedly mounted on one end of the end plate via a mounting plate. The output shaft of the motor is equipped with a drive gear, which meshes with a driven gear. The driven gear is fixedly mounted on the end plate, and a support seat is provided on one side of the driven gear.

[0011] Furthermore, a rotating rod is provided on the support base, and the other end of the rotating rod is mounted on another end plate via a bearing. A temperature measuring device is provided on the rotating rod, and temperature measuring points are set at equal intervals on the measuring tube.

[0012] The beneficial effects of this invention are as follows: Test component one and test component two work together to achieve efficient and accurate testing of the thermal conductivity of tubular metal insulation layers. Test component one provides a stable heat source through a main heater and an auxiliary heater, and uses a temperature regulator and a silicon controlled rectifier voltage regulator to achieve precise temperature control, ensuring that the temperature difference remains stable within the design range during the experiment. Test component two, through a motor-driven rotating mechanism, enables the temperature measuring device to dynamically measure the temperature points evenly distributed along the measuring tube, thereby covering more key areas and improving the comprehensiveness and accuracy of the test results. This not only improves testing efficiency but also enhances the adaptability of the device, meeting the testing needs of tubular metal insulation layers of different specifications and materials, and effectively solving the problems of complex structure, high operational difficulty, and large errors in existing testing equipment. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of a test device for the thermal conductivity of a cylindrical metal insulation layer according to an embodiment of the present utility model. Figure 2 This is a partial structural diagram of a test component of a tubular metal insulation layer thermal conductivity testing device according to an embodiment of the present invention. Figure One ; Figure 3 This is a partial structural diagram of a test component of a tubular metal insulation layer thermal conductivity testing device according to an embodiment of the present invention. Figure Two ; Figure 4 This is a partial structural diagram of test component two of a test device for testing the thermal conductivity of a cylindrical metal insulation layer according to an embodiment of the present invention. Figure One ; Figure 5 This is a partial side sectional view of the test component two of a test device for testing the thermal conductivity of a cylindrical metal insulation layer according to an embodiment of the present invention; Figure 6 This is a partial structural diagram of test component two of a test device for testing the thermal conductivity of a cylindrical metal insulation layer according to an embodiment of the present invention. Figure Two .

[0015] In the picture: 1. Measuring tube; 2. Test assembly two; 3. Test component; 4. Connecting component; 5. Cavity; 6. Main heater; 7. Auxiliary heater; 8. Temperature measuring gap; 9. Temperature regulator; 10. Thermal insulation and protection structure; 11. Thyristor voltage regulator; 12. Thyristor; 13. Resistor; 14. Regulated power supply; 15. DC regulated power supply; 16. End plate; 17. Fixing bolt; 18. Driving gear; 19. Driven gear; 20. Support base; 21. Rotating rod; 22. Motor; 23. Temperature measuring point; 24. Temperature measuring equipment. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example 1:

[0018] like Figures 1-3 As shown, a test device for the thermal conductivity of a cylindrical metal insulation layer according to an embodiment of the present invention includes a measuring tube 1, a test component 1 provided on the measuring tube 1, the test component 1 including a test part 3 and a connecting part 4, the test part 3 being provided on the measuring tube 1, and the connecting part 4 being provided at both ends of the measuring tube 1; In actual use, an electrical controller (not shown in the figure) is connected. The controller is a PLC (Programmable Logic Controller) or a microcontroller. The specific working control program of the controller is written and set according to the actual situation, which is conducive to the precise control of the electrically connected electrical components. In actual use, the above structure is electrically connected to an external power supply. The specific model and specifications of the controller need to be selected and determined according to the actual specifications of the device. The test component 3 includes a cavity 5, which is equidistantly located inside the measuring tube 1. One cavity 5 contains a main heater 6, and the other two cavities 5 contain auxiliary heaters 7. The main heater 6 and the auxiliary heaters 7 are made of heating wire material such as nickel-chromium alloy. The wiring is spirally and evenly wound on the inner wall of the cavity 5. The two ends of the heating wire are connected to the power supply line through copper terminals. The power supply line uses high-temperature resistant insulated cable to ensure electrical safety. To improve thermal uniformity, heat dissipation fins are installed inside the cavity 5. The contact surfaces of the heat dissipation fins and the heating wire are coated with thermally conductive silicone grease to enhance heat conduction efficiency. Temperature measuring slots 8 are evenly spaced on the measuring tube 1 and are connected to the cavity 5. A temperature regulator 9 is installed inside each temperature measuring slot 8. The temperature regulator 9 includes a thermocouple sensor, a temperature controller, and a power regulation module. The thermocouple sensor is installed inside the temperature measuring slot 8 to monitor temperature changes in real time. The temperature controller uses a PID algorithm to compensate and regulate the temperature difference and transmits the signal to the power regulation module. The power regulation module adjusts the power of the main heater 6 and the auxiliary heater 7 based on the feedback signal to ensure that the temperature difference on both sides of the temperature measuring slot 8 is controlled within 1.45℃. Thermal insulation structures 10 are evenly spaced outside the measuring tube 1. The temperature regulator 9 is connected to a SCR voltage regulator 11 via wires. The SCR voltage regulator 11 uses a PID algorithm to adjust the power of the main heater 6, ensuring that the temperature difference on both sides of the slot is within 1.45℃. The temperature difference is ≤1.45℃. The auxiliary heater 7 is connected to a thyristor 12 via wires. The thyristor voltage regulator 11 includes the thyristor 12, a rectifier circuit, a trigger circuit, and a control circuit. The thyristor 12 receives the control signal from the temperature regulator 9 via the trigger circuit. The rectifier circuit converts AC power to DC power. The control circuit adjusts the conduction angle of the thyristor 12 according to the PID algorithm, thereby realizing the dynamic adjustment of the heater power. The operating frequency of the thyristor voltage regulator 11 is 50Hz, the power adjustment range is 0% to 100%, and the adjustment accuracy is ±0.5%. The main heater 6 is connected to a resistor 13 via wires. The thyristor 12 and the resistor 13 are both connected to a regulated power supply 14 and a DC regulated power supply 15 via wires. The thyristor 12 is electrically connected to the connection terminal of the regulated power supply 14 via wires. The regulated power supply 14 and the DC regulated power supply 15 supply power to the heater. The temperature regulator 9 collects thermocouple data in real time and feeds it back to the thyristor 12 to adjust the power. The connecting component 4 includes an end plate 16, which is disposed at one end of one of the two thermal insulation protection structures 10. A fixing bolt 17 is provided on the end plate 16. The fixing bolt 17 is an M12×1.5 high-strength bolt, one end of which mates with a threaded hole on the end plate 16, and the other end passes through a mounting hole in the thermal insulation protection structure 10 and mates with a nut. During installation, first align the thermal insulation protection structure 10 with the end plate 16, then pass the fixing bolt 17 through the mounting hole and tighten the nut with a wrench to ensure a secure connection. The preload of the fixing bolt 17 should be controlled within the range of 50 N·m to 80 N·m to prevent structural loosening, and the fixing bolt 17 is threaded onto the thermal insulation protection structure 10. When the power of the main heater 6 and the auxiliary heater 7 reaches a stable level, and the temperature difference between the two sides of the gap is ≤1.45℃ (corresponding to the ±0.5% error requirement at a test temperature of 350℃), the system is considered to have reached thermal equilibrium.

[0019] Example 2:

[0020] like Figures 1-2 , Figure 4 , Figure 5 , Figure 6 As shown, according to an embodiment of the present invention, a test component 1 of a cylindrical metal insulation layer thermal conductivity test device is provided with a test component 2, and the test component 2 is provided on the connecting component 4. Test component 2 includes a motor 22, which is a DC servo motor. Its output shaft is connected to the drive gear 18. The drive gear 18 meshes with a driven gear 19, which is fixedly mounted on one end of the rotating rod 21. The other end of the rotating rod 21 is mounted on the end plate 16 via a bearing, and the temperature measuring device 24 is fixed on the rotating rod 21. The motor 22 drives the drive gear 18 to rotate the driven gear 19, thereby achieving the circumferential rotation of the rotating rod 21. The rotation speed of the rotating rod 21 is adjustable, ranging from 10 times per minute to 60 times per minute. Temperature measuring points 23 are evenly distributed on the outer surface of the measuring tube 1. The temperature measuring device 24 measures the temperature change at different locations by rotating. The motor 22 drives the drive gear 18 to mesh with the driven gear 19, causing the rotating rod 21 to rotate. The temperature measuring device 24 is fixed on the rotating rod 21. By rotating and covering the temperature measuring points 23 on the outer wall of the measuring tube 1, 360° temperature measurement without dead angles is achieved. The motor 22 drives the temperature measuring device 24 to rotate, records the temperature of each measuring point 23, and then substitutes it into the Fourier formula to calculate the thermal conductivity. The motor 22 is fixedly mounted on the end plate 16 by a mounting plate. At one end, the output shaft of the motor 22 is equipped with a drive gear 18, which meshes with a driven gear 19. The driven gear 19 is fixedly mounted on the end plate 16. A support base 20 is provided on one side of the driven gear 19, and a rotating rod 21 is provided on the support base 20. The other end of the rotating rod 21 is mounted on another end plate 16 via a bearing. A temperature measuring device 24 is provided on the rotating rod 21. The temperature measuring device 24 uses a thermocouple temperature sensor, which includes a thermocouple probe, a signal transmission line, and a temperature acquisition module. The thermocouple probe is installed in the temperature measuring gap 8 and transmits the temperature signal to the temperature acquisition module through the signal transmission line. The temperature acquisition module is equipped with a data processing chip for real-time acquisition, recording, and transmission of temperature data. The accuracy of the temperature measuring device 24 is ±0.1℃, and the sampling frequency can be set to once per second to once per minute according to the test requirements. Temperature measuring points 23 are evenly distributed on the measuring tube 1, and the temperature measuring points 23 are evenly distributed along the circumference of the measuring tube 1.

[0021] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0022] In summary, using the above-described technical solution of this utility model, during the testing process, the measuring tube 1, as the core part of the entire device, has a cavity 5 inside. The cavities 5 are evenly distributed, with a main heater 6 installed in one cavity and auxiliary heaters 7 installed in the other two cavities. The main heater 6 is connected to a resistor 13 via wires, while the auxiliary heaters 7 are connected to a thyristor 12 via wires. Both the thyristor 12 and the resistor 13 are connected to a regulated power supply 14 and a DC regulated power supply 15 via wires. Simultaneously, the thyristor 12 is electrically connected to the connection terminal of the regulated power supply 14 via wires. The main heater 6 and the auxiliary heaters 7 jointly provide a heat source, powered by the regulated power supply 14 and the DC regulated power supply 15, to heat the inside of the measuring tube 1. The measuring tube 1 is equipped with equally spaced heat insulation and protection structures 10 on its exterior to reduce heat loss and ensure the stability of the testing environment. Temperature measuring slits 8 are evenly spaced on the measuring tube 1. The temperature measuring slits 8 are connected to the cavity 5. A temperature regulator 9 is installed inside the cavity 5. The temperature regulator 9 is connected to the thyristor voltage regulator 11 through wires. The thermocouple data is collected in real time and fed back to the thyristor 12 to adjust the power of the heater. When the power of the main heater 6 and the auxiliary heater 7 reaches a stable state, and the temperature difference between the two sides of the temperature measuring slit 8 is ≤1.45℃ (corresponding to the ±0.5% error requirement at a test temperature of 350℃), the system reaches thermal equilibrium. Connecting components 4 are provided at both ends of the measuring tube 1. The connecting components 4 include end plates 16. The end plates 16 are threadedly connected to the thermal insulation and protection structure 10 by fixing bolts 17 to ensure the sealing and stability of the device. Test component 2 is mounted on connecting component 4. Test component 2 includes a motor 22, which is fixed to one end of end plate 16 via a mounting plate. The output shaft of motor 22 is equipped with a drive gear 18, which meshes with a driven gear 19. The driven gear 19 is fixedly mounted on end plate 16. A support base 20 is provided on one side of the driven gear 19, and a rotating rod 21 is mounted on the support base 20. The other end of the rotating rod 21 is mounted on another end plate 16 via a bearing to ensure rotational stability. A temperature measuring device 24 is installed on the rod 21. The temperature measuring device 24 collects temperature data in real time through temperature measuring points 23 distributed equidistantly along the circumference of the measuring tube 1. The accuracy of the temperature measuring device 24 is ±0.1℃. The sampling frequency can be set to once per second to once per minute according to the test requirements. Driven by the motor 22, the driving gear 18 drives the driven gear 19 to rotate, which in turn drives the rotating rod 21 to rotate. The rotation of the rotating rod 21 drives the temperature measuring device 24 to move along the circumference of the measuring tube 1, so as to achieve uniform sampling of the internal temperature of the measuring tube 1. Through the coordinated operation of the main heater 6, auxiliary heater 7, temperature regulator 9, and temperature measuring device 24, the device can achieve high-precision testing of the thermal conductivity of the cylindrical metal insulation layer. At the same time, the insulation and protection structure 10 reduces the impact of ambient temperature fluctuations, ensuring the accuracy of the test results.

[0023] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for testing the thermal conductivity of a tubular metal thermal insulation, comprising a measuring tube (1), characterised in that, Test component one is provided on the measuring tube (1), and test component two (2) is provided on test component one. Test component one includes test component (3) and connecting component (4). Test component (3) is provided on the measuring tube (1), and connecting component (4) is provided at both ends of the measuring tube (1). Test component two (2) is provided on the connecting component (4). The test component (3) includes a cavity (5), which is equidistantly located inside the measuring tube (1). One cavity (5) is equipped with a main heater (6), and the other two cavities (5) are equipped with auxiliary heaters (7). Temperature measuring slits (8) are equidistantly located on the measuring tube (1), and the temperature measuring slits (8) are connected to the cavity (5). A temperature regulator (9) is installed inside the temperature measuring slits (8). The connecting component (4) includes an end plate (16), which is located at one end of one of the two thermal insulation and protection structures (10). A fixing bolt (17) is provided on the end plate (16), and the fixing bolt (17) is threaded onto the thermal insulation and protection structure (10). Test component 2 (2) includes a motor (22), which is fixedly mounted on one end of the end plate (16) via a mounting plate. The output shaft of the motor (22) is provided with a drive gear (18), which meshes with a driven gear (19). The driven gear (19) is fixedly mounted on the end plate (16), and a support seat (20) is provided on one side of the driven gear (19).

2. A device for testing the thermal conductivity of a tubular metal thermal barrier according to claim 1, characterised in that The measuring tube (1) is provided with heat insulation protection structure (10) at equal intervals on the outside. The temperature regulator (9) is connected to the thyristor voltage regulator (11) through wires. The auxiliary heater (7) is connected to the thyristor (12) through wires. The main heater (6) is connected to the resistor (13) through wires. The thyristor (12) and the resistor (13) are both connected to the regulated power supply (14) and the DC regulated power supply (15) through wires. The thyristor (12) is electrically connected to the connection terminal of the regulated power supply (14) through wires.

3. A device for testing the thermal conductivity of a tubular metal thermal barrier according to claim 2, characterised in that A rotating rod (21) is provided on the support base (20), and the other end of the rotating rod (21) is set on another end plate (16) through a bearing. A temperature measuring device (24) is provided on the rotating rod (21), and temperature measuring points (23) are set at equal intervals on the measuring tube (1).

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