A high temperature heating device for ultrasonic vibration experiments
By designing a high-temperature heating device for ultrasonic vibration experiments, including an induction heating power supply, an infrared thermometer and an insulating sleeve, the problem of self-heating and uneven heating due to high-frequency vibration is solved, and the uniformity of the sample heating temperature and the accuracy of the experimental results are achieved.
Patent Information
- Application Number
- CN202421181379.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-05-28
AI Technical Summary
In ultrasonic vibration experiments, the sample generates self-heating due to high-frequency vibration, and the sample has a special shape and small size, making it difficult to use traditional high-temperature heating devices for uniform heating, resulting in a large temperature gradient and reducing the accuracy of the experimental results.
A high-temperature heating device for ultrasonic vibration experiments is designed, including an induction heating power supply, an infrared thermometer and an insulation sleeve. The insulation sleeve consists of an inner insulation pipe and an outer insulation pipe. The inner insulation pipe is sleeved outside the sample, the induction heating coil is sleeved outside the insulation sleeve, and the infrared thermometer monitors the test sample temperature in real time through the through hole.
By closing the space, reducing heat loss, avoiding external airflow disturbance, achieving uniformity of the sample heating temperature, and improving experimental efficiency and accuracy.
Smart Images
Figure CN222706654U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of experimental equipment, in particular to a high-temperature heating device used for ultrasonic vibration experiments. Background Art
[0002] Aircraft engines are highly complex and sophisticated thermal machines. As the power components of aircraft, their mechanical properties and service life closely affect the safety of aircraft. Traditional material fatigue limit tests usually use medium-frequency vibrations of about 20 Hz, which takes at least 2 to 3 years to test the alloy materials of aircraft engine blades. In order to shorten the experimental cycle, most vibration tests are now conducted through piezoelectric ultrasound, with a vibration frequency of 20 kHz. Since the alloy materials used in aircraft engines work under high temperature conditions, the specimens need to be heated when testing their fatigue life. However, the material has a high self-heating rate due to high-frequency vibration during the experiment. The specimen has a special shape and small size. Due to the requirements of the resonant frequency, additional fixtures cannot be used. Whether based on the layout space or the temperature control response speed, it is not suitable to use a closed vacuum furnace or a more complex and larger high-temperature radiation furnace to heat the specimen. If an induction coil is used to heat the sample in an open environment, it is easily affected by external airflow disturbances, which reduces the temperature control effect; one end of the sample is generally connected to the amplifier rod of the ultrasonic testing machine by bolts, while the other end of the sample is suspended in the air. There is a large difference in the heat loss rate in the air and the heat loss rate in the metal connection area, resulting in a large axial temperature gradient of the sample; in addition, since the heating principle of the induction coil is eddy current heating, the temperature gradient generated in the axial direction of the sample varies greatly, the sample is not heated evenly, and the accuracy of the experimental results is reduced. Utility Model Content
[0003] The utility model is developed to solve the above problems and aims to provide a high temperature heating device for ultrasonic vibration experiments.
[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0005] A high temperature heating device for ultrasonic vibration experiment, comprising an induction heating power supply, an infrared thermometer and a thermal insulation sleeve, wherein:
[0006] The thermal insulation casing is made of heat-resistant insulating material, including an inner thermal insulation pipe and an outer thermal insulation pipe;
[0007] The inner insulation pipe is sheathed outside the sample and does not contact the sample; one end of the inner insulation pipe is located at the connection between the sample and the amplifier rod of the ultrasonic testing machine, and insulation cotton is filled between the inner wall of the pipe and the amplifier rod; the other end of the inner insulation pipe is provided with an insulation plug;
[0008] The induction heating power supply is connected to a contoured induction heating coil corresponding to the shape of the sample, and the contoured induction heating coil is sheathed outside the insulation sleeve;
[0009] A through hole for infrared rays to pass through is provided at a position on the thermal insulation sleeve corresponding to the middle of the sample.
[0010] Preferably, the inner insulation tube is made of quartz, and the outer insulation tube and insulation plug are made of alumina.
[0011] Furthermore, insulation cotton is also filled between the outer insulation pipe and the inner insulation pipe; the insulation cotton is all alumina insulation cotton.
[0012] Furthermore, an air insulation layer is provided between the outer insulation pipe and the inner insulation pipe.
[0013] Preferably, the diameter of the through hole is 2 mm.
[0014] Furthermore, the high temperature heating device for ultrasonic vibration experiment also includes: a first position adjustment bracket, and the high temperature heating device insulation sleeve is detachably connected to the first position adjustment bracket.
[0015] Furthermore, a U-shaped clamp is fastened to the first position adjustment bracket by bolts, and the U-shaped clamp is clamped on the lower end of the insulation sleeve.
[0016] Furthermore, the high temperature heating device for ultrasonic vibration experiment also includes: a second position adjustment bracket, and the infrared thermometer is fixedly installed on the second position adjustment bracket.
[0017] Furthermore, the high temperature heating device for ultrasonic vibration experiment also includes: a cooler for cooling the induction heating power supply and the infrared thermometer.
[0018] Furthermore, the high temperature heating device for ultrasonic vibration experiment also includes: a controller which is communicatively connected with the induction heating power supply and the infrared thermometer.
[0019] Compared with the prior art, the utility model has the following beneficial effects:
[0020] 1. In the high-temperature heating device used in the ultrasonic vibration experiment of the utility model, the thermal insulation sleeve can form a closed space outside the sample to reduce heat loss and avoid the influence of external air flow disturbance, which can effectively improve the efficiency and accuracy of the experiment.
[0021] 2. The contoured induction heating coil arranged according to the sample in the high-temperature heating device of the utility model for ultrasonic vibration experiment can improve the uniformity of magnetic flux at different axial positions of the sample, make the heating temperature of the sample more uniform, and make the experimental results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 The utility model is a schematic structural diagram of a high temperature heating device and a sample used in an ultrasonic vibration experiment.
[0023] Figure Number:
[0024] 1- sample, 2- amplifier rod;
[0025] 10-induction heating power supply, 11-profile induction heating coil, 20-infrared thermometer, 30-insulation sleeve, 31-inner insulation tube, 32-outer insulation tube, 33-insulation cotton, 34-insulation plug, 35-through hole, 40-first position adjustment bracket, 41-U-shaped clamp, 50-second position adjustment bracket. DETAILED DESCRIPTION
[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments are combined with the accompanying drawings to specifically illustrate the high-temperature heating device of the present invention for ultrasonic vibration experiments.
[0027] In the ultrasonic vibration experiment for testing the fatigue limit of materials, the specimen 1 used is usually in the shape of a rod with large ends and a small middle. One end (usually the upper end) of the specimen 1 is fastened to the amplifier rod 2 of the ultrasonic testing machine by bolts, and the other end (the lower end) is a suspended free end. In order to meet the requirement of a resonant frequency of 20kHz, the specimen 1 used in the experiment is usually relatively small, and the specific size varies according to the density and elastic modulus of different materials.
[0028] like Figure 1 As shown, this embodiment provides a high temperature heating device for ultrasonic vibration experiment, including an induction heating power supply 10, an infrared thermometer 20 and a thermal insulation sleeve 30, wherein:
[0029] The insulation sleeve 30 is made of heat-resistant insulating material, including an inner insulation tube 31 and an outer insulation tube 32. The inner insulation tube 31 is sleeved outside the sample 1 and does not contact the sample 1. One end of the inner insulation tube 31 is located at the connection between the sample 1 and the amplifier rod 2 of the ultrasonic testing machine, and the inner wall of the tube and the amplifier rod 2 are filled with insulation cotton 33; the other end of the inner insulation tube 31 is provided with an insulation plug 34.
[0030] The induction heating power source 10 is connected to a contoured induction heating coil 11 corresponding to the shape of the sample 1 , and the contoured induction heating coil 11 is sleeved on the outside of the thermal insulation sleeve 30 .
[0031] A through hole 35 for infrared rays to pass through is provided on the heat-insulating sleeve 30 at a position corresponding to the middle of the sample 1 .
[0032] Specifically, the induction heating power supply 10 uses an existing IGBT induction heating power supply, has an IGBT inverter circuit, and is fully digitally controlled, which can achieve higher control accuracy.
[0033] The induction heating area of the contoured induction heating coil 11 is controlled within the effective section (middle section) of the sample 1, and the temperature gradient change caused by the different heat loss rates at the two ends of the sample 1 is minimized. The contoured induction heating coil 11 is preferably made of copper, and its shape corresponds to the sample 1 with large ends and a small middle. The coil width at the two ends of the contoured induction heating coil 11 is greater than the coil width in the middle part, ensuring the uniformity of the magnetic flux at different positions of the sample 1, thereby making the heating temperature of the effective section of the sample 1 more uniform.
[0034] Taking into account the self-heating problem of sample 1 under high-frequency vibration, the temperature feedback signal should be directly obtained from sample 1. However, at a vibration frequency of 20kHz, the thermocouple cannot collect the temperature signal on sample 1. Therefore, in this embodiment, a high-precision non-contact two-color infrared temperature measuring instrument is used to collect the temperature of sample 1 during the experiment, providing a reference basis for adjusting the heating temperature and better maintaining the temperature balance and stability of sample 1.
[0035] In this embodiment, the high temperature heating device further includes a controller (not shown) that is in communication with the induction heating power supply 10 and the infrared thermometer 20. In practical applications, a computer can be used as the controller to automatically perform feedback adjustment according to the real-time measured temperature through a computer program.
[0036] The open heating environment is easily affected by the disturbance of the surrounding airflow, and the temperature control accuracy may jump, so it is necessary to add a structure to assist in temperature control. The insulation sleeve 30 is arranged between the contoured induction heating coil 11 and the sample 1, which can reduce the influence of the external airflow on the experiment, maintain the stability of the thermal field, and help reduce the axial temperature gradient caused by the different heat losses at both ends of the sample 1. Preferably, in the insulation sleeve 30, the inner insulation tube 31 is made of quartz material, and the quartz tube has good support and thermal insulation properties. The outer insulation tube 32 and the insulation plug 34 are both made of alumina. In this embodiment, the outer insulation tube 32 and the inner insulation tube 31 are also filled with insulation cotton 33, and the insulation cotton 33 used are all alumina insulation cotton 33. In actual application, the insulation cotton 33 may not be filled, and the relative positions of the outer insulation tube 32 and the inner insulation tube 31 are fixed, so that a gap is left between the two, and the air in the gap forms an air insulation layer. The double-layer sleeve structure can reduce the heat transfer inside and outside the tube. The tube ends are sealed by thermal insulation cotton 33 and thermal insulation plug 34, which further improves the thermal insulation performance. The diameter of the through hole 35 on the thermal insulation sleeve 30 is preferably 2 mm, which allows infrared rays to pass through, while avoiding the influence of the temperature inside the tube due to the opening being too large. For samples 1 of different sizes, the thermal insulation sleeve 30 of appropriate size can be configured accordingly. The thermal insulation sleeve 30 has a simple structure, is easy to manufacture, and has a low cost.
[0037] Furthermore, the high temperature heating device also includes a first position adjustment bracket 40, and the insulation sleeve 30 is detachably connected to the first position adjustment bracket 40. In this embodiment, a U-shaped clamp 41 is fastened to the first position adjustment bracket 40 by bolts, and the U-shaped clamp 41 is clamped at the lower end of the insulation sleeve 30 to provide support for the insulation sleeve 30. During the experiment, the insulation sleeve 30 of corresponding specifications can be selected according to the sample 1, and the position of the insulation sleeve 30 can be adjusted so that the through hole on the insulation sleeve 30 is aligned with the middle of the sample 1 to improve the accuracy of the test result. When replacing the sample 1, the insulation sleeve 30 is easy to move and disassemble, the required cooling time is short, and the test efficiency is high.
[0038] Furthermore, the high temperature heating device also includes a second position adjustment bracket 50, and the infrared thermometer 20 is fixedly mounted on the second position adjustment bracket 50, so as to facilitate the adjustment of the position of the infrared thermometer 20 so that the infrared rays emitted by it can accurately penetrate the through hole 35 on the insulation sleeve 30 and irradiate the sample 1.
[0039] Since the sample 1 is usually arranged vertically during the experiment, and the connection position between the sample 1 and the ultrasonic testing machine is fixed, the first position adjustment bracket 40 and the second position adjustment bracket 50 can only be configured as a lifting structure to adjust the height of the insulation sleeve 30 and the infrared thermometer 20; of course, it can also be configured as a three-axis movable structure to perform multi-directional fine adjustment. The first position adjustment bracket 40 and the second position adjustment bracket 50 can both be implemented by using common screw nuts, gear racks, sliders, slide rails, etc., combined with rods and plates, and will not be described in detail here.
[0040] Furthermore, the high temperature heating device also includes a cooler (not shown) for the induction heating power supply 10 and the infrared thermometer 20. In this embodiment, the cooler is an industrial chiller, which can cool the equipment and improve the stability and continuity of the equipment.
[0041] During the experiment, firstly, according to the position of the sample 1 installed on the amplifier rod 2 of the ultrasonic testing machine, the height of the insulation sleeve 30 is adjusted through the first position adjustment bracket 40, so that the through hole 35 is aligned with the middle of the sample 1; then the position of the infrared thermometer 20 is adjusted through the second position adjustment bracket 50, so that the infrared rays emitted by it can pass through the through hole 35 and irradiate the middle of the sample 1; then, the height of the contoured induction heating coil 11 is adjusted by moving the handheld head of the extension on the induction heating power supply 10, so that it corresponds to the middle section of the sample 1. During the experiment, the sample 1 is heated by electromagnetic induction, and the infrared thermometer 20 detects the temperature of the sample 1 in real time and gives feedback, so that the sample 1 is controlled at a suitable temperature; at the same time, the cooler cools the induction heating power supply 10 and the infrared thermometer 20 to ensure stable operation of the equipment.
[0042] The high-temperature heating device for ultrasonic vibration experiments of the utility model has a simple structure, is easy to operate, has a low cost, is highly practical, can effectively improve the experimental efficiency and the accuracy of the experimental results, and has a high value of popularization and application.
[0043] The above implementation modes are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.
Claims
1. A high temperature heating device for ultrasonic vibration experiment, characterized in that: It includes an induction heating power supply, an infrared thermometer and a thermal insulation sleeve, wherein: The thermal insulation sleeve is made of heat-resistant insulating material, including an inner thermal insulation pipe and an outer thermal insulation pipe; The inner insulation pipe is sleeved on the outside of the sample and does not contact the sample; one end of the inner insulation pipe is located at the connection between the sample and the amplifier rod of the ultrasonic testing machine, and insulation cotton is filled between the inner wall of the pipe and the amplifier rod; the other end of the inner insulation pipe is provided with an insulation plug; The induction heating power supply is connected to a contoured induction heating coil corresponding to the shape of the sample, and the contoured induction heating coil is sleeved outside the insulation sleeve; A through hole for infrared rays to pass through is provided at a position on the thermal insulation sleeve corresponding to the middle of the sample.
2. The high temperature heating device for ultrasonic vibration experiment according to claim 1, characterized in that: The inner insulation tube is made of quartz material, and the outer insulation tube and the insulation plug are made of alumina material.
3. The high temperature heating device for ultrasonic vibration experiment according to claim 1, characterized in that: The outer insulation pipe and the inner insulation pipe are also filled with insulation cotton; The thermal insulation cottons are all alumina thermal insulation cottons.
4. The high temperature heating device for ultrasonic vibration experiment according to claim 1, characterized in that: An air insulation layer is arranged between the outer insulation pipe and the inner insulation pipe.
5. The high temperature heating device for ultrasonic vibration experiment according to claim 1, characterized in that: The diameter of the through hole is 2 mm.
6. The high temperature heating device for ultrasonic vibration experiment according to claim 1, characterized in that: Also includes: The first position adjustment bracket, The high temperature heating device insulation sleeve is detachably connected to the first position adjustment bracket.
7. The high temperature heating device for ultrasonic vibration experiment according to claim 6, characterized in that: A U-shaped clamp is fastened to the first position adjustment bracket by bolts, and the U-shaped clamp is clamped on the lower end of the thermal insulation sleeve.
8. The high temperature heating device for ultrasonic vibration experiment according to claim 1, characterized in that: Also includes: The second position adjustment bracket, The infrared thermometer is fixedly mounted on the second position adjustment bracket.
9. The high temperature heating device for ultrasonic vibration experiment according to claim 1, characterized in that: Also includes: Coolers for cooling induction heating power supplies and infrared thermometers.
10. The high temperature heating device for ultrasonic vibration experiment according to claim 1, characterized in that: Also includes: A controller is communicatively connected to the induction heating power supply and the infrared thermometer.