An independent multi-point quartz lamp thermal assessment device based on focused heating

Abstract

The present invention discloses an independent multi-point quartz lamp thermal assessment device based on focused heating, which can perform remote, continuous, non-contact and controllable heating on the heating surface or point of the sample under test, which not only overcomes the shortcomings of traditional gas thermal shock test devices, such as high cost, large noise pollution, difficult control of temperature distribution and rising and falling rates, low safety, and inability of isothermal thermal cycle test devices to achieve gradient thermal shock, but also overcomes the shortcomings of traditional quartz lamp heating devices, such as low efficiency, low temperature rise, low upper temperature limit, short continuous heating time, and poor adaptability. At the same time, gradient or isothermal thermal shock in a wide range can be achieved by adjusting the heating power, heating distance, and modular splicing number of the quartz lamp. Therefore, the present invention realizes an economical, safe, clean, quiet, flexible and efficient gradient thermal shock test device.

Description

Technical Field

[0001] The present invention relates to an independent multi-point quartz lamp thermal assessment device based on focused heating, which is suitable for independent multi-point heating experiments of small-area / local complex special-shaped structures. The temperature of each point can be adjusted as needed, and due to the focusing effect, the temperature generated by the present invention is higher than the upper temperature limit of traditional quartz lamps, and can be used for extreme thermal environment test simulations such as hypersonic aircraft and aircraft engines. Background Art

[0002] In recent years, countries around the world have paid more and more attention to hypersonic aircraft, and the development of my country's hypersonic aircraft is also seeking new breakthroughs. The aerodynamic heating phenomenon after the aircraft hypersonic flight is very serious. When the aircraft flies at Mach number 3, its surface stagnation temperature reaches 500℃; the leading edge temperature of the wing of a hypersonic cruise missile with a Mach number of 8-9 will exceed 1200℃. The high temperature generated by aerodynamic heat will reduce the strength limit of the material and the bearing capacity of the aircraft structure, causing thermal deformation of the aircraft structure, destroying the aerodynamic shape of the components and affecting flight safety. In order to ensure the safety of high-speed aircraft and confirm whether the aircraft materials / structures can withstand the thermal shock and high-temperature thermal stress damage generated during high-speed flight, it is necessary to conduct static and dynamic aerodynamic thermal simulation tests or heat-load joint tests on the materials and structures used in high-speed aircraft. Simulate the heating conditions of the aircraft structure during high-speed flight, test and analyze the impact of changes in high-temperature mechanical properties such as thermal strength, thermal stress, thermal deformation, and thermal expansion of the material under transient thermal shock conditions on flight safety.

[0003] At present, customized heating equipment is often used to test the aerodynamic heating of large and complex surfaces of hypersonic vehicles. A bracket suitable for the required heating surface is built, and exposed quartz lamp heating tubes are arranged between the brackets to perform heating tests on the surface. Among them, the quartz lamp heating tube is not forced to cool; the wires of the quartz lamp tube are directly connected to the heating control power bus. During the experiment, the heated surface is first pushed into the bracket of the heating equipment. Traditional heating methods have the following problems:

[0004] 1. Due to the use of exposed quartz lamp heating tubes, the radiation from the back of the lamp tube cannot be efficiently utilized in the heating process.

[0005] 2. Single customized equipment lacks adaptability to single-point pneumatic heating tests of different types and specifications.

[0006] 3. The temperature field distribution of aerodynamic heating of hypersonic aircraft is complex. For customized equipment, the control system is difficult to write and the experimental cycle is long.

[0007] 4. The temperature and heat flux density of traditional quartz lamps cannot meet the requirements of some extreme working conditions.

[0008] At the same time, in the past few decades, the study of thin film substrate systems has become one of the development topics in the field of materials science and engineering. Solid-state thin films have been successfully applied to a variety of engineering systems in many fields such as electronics, information, aerospace, and medicine, and have achieved a variety of functions. For example, thin film devices in integrated circuits, thin film sensors in flexible micro-electromechanical systems, thermal insulation coatings on the surface of high-temperature hot end components, and wear-resistant coatings on the surface of friction and wear parts. However, the mismatch between the material properties of the thin film material and the substrate material in the thin film substrate system often causes the film to produce sufficiently large internal stress, causing delamination, fracture, and even failure of the film. For high-temperature thermal insulation coatings represented by thermal barrier coatings, the internal stress caused by thermal mismatch is one of the main reasons for the peeling failure of the coating system. Thermal shock performance is the main experimental means to evaluate the service performance of high-temperature thermal insulation coatings.

[0009] At present, the thermal shock performance of high-temperature thermal insulation coatings is mostly completed by gas thermal shock test equipment or isothermal thermal cycle test equipment. The basic principle of the gas thermal shock test device is to use a high-temperature flame spray gun to generate a high-temperature and high-speed flame to directly heat the test sample, and use compressed air to cool the back of the sample. After a period of time, stop heating, and continue to use compressed air to cool the test sample to room temperature to complete a thermal shock, and then use this cycle to achieve thermal shock testing in a temperature gradient environment. However, taking thermal barrier coatings as an example, under the conditions of gas heating at 1250°C, insulation for 5 minutes, forced cooling to room temperature with compressed air, and surface peeling of 15% is considered to be failure, its thermal shock life can often reach more than 8,000 times. A complete experiment often takes several months, which brings great difficulties to the feasibility and repeatability of experimental operations. In general, the traditional thermal shock performance evaluation method has the following problems:

[0010] 1. The demand for fuel is very high and the cost remains high;

[0011] 2. Gas heating methods based on hydrogen-oxygen or oxygen-acetylene pose huge safety risks;

[0012] 3. Gas heating is prone to produce harmful polluting gases and serious noise pollution;

[0013] 4. It takes too long and is inefficient.

[0014] Isothermal thermal cycle test is another thermal shock performance evaluation method different from gas thermal shock test. Its principle is to put the test sample directly into an isothermal high-temperature environment, keep it warm for a period of time, then quickly take it out, blow it with compressed air or put it into water for water quenching. Compared with the gas thermal shock test device, the isothermal thermal cycle test device does not have large fuel demand, safety hazards and noise pollution, and its efficiency is greatly improved when water quenching is adopted. However, the high-temperature thermal insulation coating working in the real service environment, due to the thermal insulation effect of the coating itself and the air film cooling effect, its outer surface temperature can often reach 1200℃-1700℃, while the inner surface temperature of the coating in contact with the substrate is only 800-900℃. This results in a temperature gradient of 300-900℃ inside the 300-500μm thermal insulation coating along the thickness direction. The latest research shows that the temperature gradient has a crucial influence on the service performance of the high-temperature thermal insulation coating. However, the isothermal thermal cycle test device cannot realize the thermal shock test considering the temperature gradient.

[0015] At present, there is no successful development of a test device that can overcome the many shortcomings of gas thermal shock test devices and realize thermal shock testing under temperature gradient. In summary, it is necessary to develop an economical, safe, clean, quiet and efficient programmable high-temperature heating device. Summary of the invention

[0016] In order to solve the above problems, the present invention provides an independent multi-point quartz lamp thermal assessment device based on focused heating, which has the characteristics of compact structure, stable performance, large-scale modular splicing, easy and flexible temperature control, better efficiency and higher temperature limit.

[0017] The present invention is achieved by adopting the following technical solutions:

[0018] An independent multi-point quartz lamp thermal assessment device based on focused heating comprises a sheet metal outer cover box, a quartz lamp light box seat and a plurality of quartz lamp light boxes arranged in the sheet metal outer cover box; wherein the quartz lamp light box seat is provided with a plurality of parallel quartz lamp light box slides, and a plurality of quartz lamp light boxes are installed on each quartz lamp light box slide, the quartz lamp light box is supported on the quartz lamp light box seat by a quartz lamp light box upper cover, and is fixed to the quartz lamp light box seat by the quartz lamp light box upper cover, the quartz lamp light box upper cover is provided with wiring holes for facilitating the connection of quartz lamp beads to electricity, a plurality of quartz lamp filaments are connected to the quartz lamp light box, and the lower surface of the light box is a convex lens made of quartz glass, which converges the parallel light emitted by the lamp beads in the quartz lamp light box to one point, thereby achieving the effect of single-point heating;

[0019] An upper coolant pipe in the sheet metal box and a lower coolant pipe in the sheet metal box are arranged in the upper and lower parts of the sheet metal outer cover box respectively; an upper coolant pipe water inlet and an upper coolant pipe water outlet are arranged on the upper coolant pipe in the sheet metal box, and a lower coolant pipe water inlet and a lower coolant pipe water outlet are arranged on the lower coolant pipe in the sheet metal box.

[0020] A further improvement of the present invention is that the height of the quartz lamp light box is greater than the thickness of the quartz lamp light box base.

[0021] A further improvement of the present invention is that the diameter of the upper cover of the quartz lamp light box is greater than the width of the slideway.

[0022] A further improvement of the present invention is that the upper cover of the quartz lamp light box is also arranged with threaded holes on the upper wall of the sheet metal box body, which is convenient for screwing in bolts to tighten and fix the quartz lamp light box on the quartz lamp light box.

[0023] A further improvement of the present invention is that four threaded holes are opened on the wall of the sheet metal box body, which are used to fix the external suspension instrument so that it can be suspended above the test piece, so that the distance between it and the test piece is adjustable.

[0024] A further improvement of the present invention is that the upper cover of the quartz lamp light box is made of high temperature ceramic material, the side wall of the quartz lamp light box is made of quartz glass, and a heat-resistant reflective coating material is coated on the inside to enhance the useful power of the quartz lamp.

[0025] A further improvement of the present invention is that the sheet metal outer cover box is made of bent stainless steel sheets.

[0026] A further improvement of the present invention is that two front and rear sheet metal box side wall surface slots are opened on the sheet metal outer cover box side wall, and their function is to insert a piece of insulating mullite, so as to place the test piece on top of the mullite and perform a heating experiment inside the sheet metal outer cover box.

[0027] The present invention has at least the following beneficial technical effects:

[0028] 1. The quartz lamp heating method is a remote non-contact heating method. Its principle is to convert the electrical energy input into a high-efficiency heat source of infrared radiation. Compared with gas heating, its temperature distribution, size and rise and fall rate are greatly improved, and the quartz lamp also has the advantages of being quiet and clean;

[0029] 2. The box adopts water-cooled forced convection heat exchange method, which effectively reduces the thermal damage of quartz lamps and experimental boxes.

[0030] 3. The power of each independent quartz lamp tube is independently controlled by the control system, and the heating of the device is easy to control and adjust on a large scale.

[0031] 4. The upper cover and sides of the quartz lamp box are filled with reflective paint, which reduces the irradiation effect of the heating light on the rear side wall, further enhances the irradiation intensity of the front radiated surface, and improves the heating efficiency of the heating surface.

[0032] 5. It adopts modular design concept, control theory, and independent cooling unit. At the same time, the temperature of a single device is always stable during the heating process and normal operation. Compared with the traditional quartz lamp heating technology, it can be spliced ​​and combined on a large scale and applied to the heating of large areas and complex surfaces.

[0033] 6. The bottom surfaces of the nine quartz lamp boxes are all single-sided convex lenses made of quartz glass. Through refraction, the originally nearly parallel light rays are focused to one point, thereby greatly enhancing the heat flux density at a single point and allowing the test piece to reach a temperature that cannot be achieved by traditional quartz lamp groups.

[0034] In summary, the present invention discloses an independent multi-point quartz lamp thermal assessment device based on focused heating, which can perform remote, continuous, non-contact and controllable heating on the heating surface or point of the sample under test, which not only overcomes the shortcomings of traditional gas thermal shock test devices, such as high cost, high noise pollution, difficult to control temperature distribution and rising and falling rates, low safety, and inability of isothermal thermal cycle test devices to achieve gradient thermal shock, but also overcomes the shortcomings of traditional quartz lamp heating devices, such as low efficiency, low temperature rise, low upper temperature limit, short continuous heating time, and poor adaptability. At the same time, gradient or isothermal thermal shock in a wide range can be achieved by adjusting the heating power, heating distance, and modular splicing number of the quartz lamp. Therefore, the present invention realizes an economical, safe, clean, quiet, flexible and efficient gradient thermal shock test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is an overall view of the present invention.

[0036] Figure 2 (a)-(d) are respectively the front view, rear view, bottom view and top view of the present invention.

[0037] Figure 3 This is a left perspective view.

[0038] Figure 4 for Figure 3 CC cross-sectional view.

[0039] Figure 5 is the main view.

[0040] Figure 6 In (a) and (b), they are Figure 5 AA and BB cross-sectional views.

[0041] Figure 7 This is a perspective view of the light box.

[0042] Description of reference numerals:

[0043] 1 is a sheet metal outer cover box, 2 is a quartz lamp light box seat, 3 is a quartz lamp light box, 4 is a quartz lamp light box upper cover, 5 is a quartz lamp light box side wall, 6 is a lower surface of the light box, 7 is an upper coolant pipeline in the sheet metal box, 7-a is an upper coolant pipeline water inlet, 7-b is an upper coolant pipeline water outlet, 8 is a lower coolant pipeline in the sheet metal box, 8-a is a lower coolant pipeline water inlet, 8-b is a lower coolant pipeline water outlet, 9 is a sheet metal box side wall surface slot, 10 is a sheet metal box upper wall surface threaded hole, and 11 is a quartz lamp filament. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] like Figure 1 , 2 As shown in Figure 3, the present invention provides an independent multi-point quartz lamp thermal assessment device based on focused heating, including a sheet metal outer cover box 1, a quartz lamp light box seat 2, a quartz lamp light box 3, a quartz lamp light box upper cover 4, a quartz lamp light box side wall 5, a light box lower surface 6, an upper coolant pipe 7 in the sheet metal box body, a lower coolant pipe 8 in the sheet metal box body, a sheet metal box side wall slot 9, a sheet metal box upper wall threaded hole 10, and a quartz lamp filament 11.

[0046] The quartz lamp light box seat 2 is fixedly connected to the sheet metal outer cover box body 1 , and the sheet metal outer cover box body 1 is hollowed out below the quartz lamp light box seat 2 .

[0047] The quartz lamp light box seat 2 is provided with three quartz lamp light box slideways, on which nine quartz lamp light boxes 3 are installed. The height of the quartz lamp light box seat 2 is greater than the thickness of the quartz lamp light box seat 2, and the diameter of the quartz lamp light box upper cover 4 is greater than the width of the quartz lamp light box slideway. The quartz lamp light box 3 is supported on the quartz lamp light box seat 2 through the quartz lamp light box upper cover 4. The quartz lamp light box upper cover 4 is provided with wiring holes for convenient connection of quartz lamp beads, and is also provided with threaded holes 10 on the upper wall of the sheet metal box for convenient screwing in bolts to tighten and fix the light box on the slideway. In addition, a number of quartz lamp filaments 11 can be connected to the quartz lamp light box 3 as needed. The quartz lamp light box upper cover 4 is made of high-temperature ceramic material, and the quartz lamp light box side wall 5 is made of quartz glass, and a heat-resistant reflective coating material is also coated on the inside to enhance the useful power of the quartz lamp. The lower surface 6 of the lamp box is a convex lens made of quartz glass, which converges the parallel light emitted by the lamp beads in the lamp box to one point, thereby achieving a single-point heating effect.

[0048] The sheet metal cover box body 1 is made of stainless steel, and the upper coolant pipe 7 and the lower coolant pipe 8 are arranged in the sheet metal cover box body 1. The cooling water enters from the upper coolant pipe water inlet 7-a and the lower coolant pipe water inlet 8-a at the same time, and flows out from the upper coolant pipe water outlet 7-b and the lower coolant pipe water outlet 8-b at the back after a circle around the sheet metal cover box body 1. Four sheet metal box upper wall threaded holes 10 are opened on the sheet metal cover box body 1, and their function is to fix with the external suspension instrument so that it can be suspended above the test piece, so that the distance between the test piece and the test piece is adjustable. There are also two sheet metal box side wall card slots 9 on the front and rear sides of the sheet metal cover box body 1, and their function is to insert a piece of heat-insulating mullite. The test piece can be placed above the mullite and a heating experiment can be carried out inside the box. Its advantage is that when the distance between the test piece and the quartz lamp is allowed to be close, no external suspension device is required.

[0049] Furthermore, by adjusting the number of lamp tube groups, changing the length of the lamp tube groups, and making adaptive changes to the external structural parts, the size and power of a single lamp module can be improved. The shape of the lamp tube interlayer can be changed, and the structural parts can be adaptively changed to achieve the purpose of adaptive changes in the required heating surface. For part of the surface of the structural parts and the lamp tube, a heat insulation coating is sprayed to reduce the actual working temperature of some parts. The number and diameter of the coolant inlet and outlet are adjusted, and the layout range and distance of the internal coolant pipeline are adjusted to improve the cooling efficiency of the coolant.

[0050] Furthermore, the entire device can be fixed with materials having a temperature resistance of more than 100°C at normal operating temperature (below 1800°C). The side wall of the box body is protected by a cooling channel.

[0051] The electrical circuit in the lamp adopts high-temperature glass fiber braided insulated wire. The quartz lamp tube adopts tungsten filament halogen heating tube, with a rated voltage of 220V, a rated power of 2KW, and can be adjusted and customized. The heating temperature is as high as 3300K, the radiation energy is stable, and it can achieve 1800℃ remote rapid heating, which is not affected by the surrounding environment and is only effective for the irradiated object. The power of the halogen lamp can be changed by adjusting the power supply. At the same time, this heating method belongs to electrically controlled non-contact heating, which has the advantages of economy, safety, cleanliness, quietness and efficiency, and has a service life of more than 5000 hours.

[0052] The internal cooling pipeline, lamp holder and quartz lamp mounting end of the heating lamp are made of the same material and have high thermal conductivity and low thermal expansion coefficient.

[0053] The sheet metal shell is made of stainless steel.

[0054] The present invention provides an independent multi-point quartz lamp thermal assessment device based on focused heating, and its use method is as follows:

[0055] Step 1: Place the device upright, check whether the cooling pipe of the test device is complete, intact, and unblocked, check whether the quartz lamp tube is oily or blocked, and check whether the electrical circuit is short-circuited or exposed. When all items meet the requirements, the equipment safety inspection is completed.

[0056] Step 2: Slowly inject cooling water from the water inlet. When the cooling water flows out of the water outlet, observe whether there are bubbles in the water. When there are no bubbles in the water, increase the cooling water flow rate. When the cooling water flows out of the outlet steadily and without pulsation, the device can be placed in the required heating angle and position to complete the cooling water injection.

[0057] Step 3: Turn on the power, preheat the lamp for one minute according to the actual working conditions, and observe whether there is any problem with the equipment.

[0058] Step 4: Enter the experimental stage, and control the heating power of the lamp tube by controlling the signal changes in the power supply to achieve long-term heating or high-speed isothermal shock cycle.

[0059] Step 6: After the test, first turn off the power system, and stop injecting coolant after the equipment cools down to room temperature. Finally, drain the excess cooling water in the pipeline to end the heating process.

[0060] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation methods of the present invention are limited to these. For ordinary technicians in the technical field of the present invention, several improvements and substitutions can be made without departing from the concept of the present invention, which should be deemed to belong to the scope of patent protection determined by the claims submitted by the present invention.

Claims

1. An independent multi-point quartz lamp thermal assessment device based on focused heating, characterized in that: It comprises a sheet metal outer cover box (1), a quartz lamp light box seat (2) arranged in the sheet metal outer cover box (1), and a plurality of quartz lamp light boxes (3); wherein: A plurality of parallel quartz lamp light box slides are arranged on the quartz lamp light box seat (2), and a plurality of quartz lamp light boxes (3) are installed on each quartz lamp light box slide. The quartz lamp light box (3) is supported on the quartz lamp light box seat (2) through a quartz lamp light box upper cover (4), and is fixed to the quartz lamp light box seat (2) through the quartz lamp light box upper cover (4). The quartz lamp light box upper cover (4) is provided with wiring holes for facilitating the connection of quartz lamp beads to electricity. A plurality of quartz lamp filaments (11) are connected to the quartz lamp light box (3), and the lower surface (6) of the light box is a convex lens made of quartz glass, which converges parallel light emitted by the lamp beads in the quartz lamp light box (3) to a point, thereby achieving a single-point heating effect. An upper coolant pipe (7) in the sheet metal box and a lower coolant pipe (8) in the sheet metal box are arranged in the upper and lower parts of the sheet metal outer cover box (1), respectively; an upper coolant pipe water inlet (7-a) and an upper coolant pipe water outlet (7-b) are provided on the upper coolant pipe (7) in the sheet metal box, and a lower coolant pipe water inlet (8-a) and a lower coolant pipe water outlet (8-b) are provided on the lower coolant pipe (8) in the sheet metal box; The height of the quartz lamp light box (3) is greater than the thickness of the quartz lamp light box base (2); The diameter of the quartz lamp light box upper cover (4) is greater than the width of the slideway.

2. According to claim 1, an independent multi-point quartz lamp thermal assessment device based on focused heating is characterized in that: The upper cover (4) of the quartz lamp box is also provided with a threaded hole (10) on the upper wall of the sheet metal box body, which is convenient for screwing in bolts to tighten and fix the quartz lamp box (3) on the quartz lamp box.

3. The independent multi-point quartz lamp thermal assessment device based on focused heating according to claim 1 is characterized in that: The sheet metal outer cover box (1) is provided with four sheet metal box upper wall threaded holes (10) for fixing with an external suspension instrument so that it can be suspended above the test piece, so that the distance between it and the test piece is adjustable.

4. The independent multi-point quartz lamp thermal assessment device based on focused heating according to claim 1, characterized in that: The upper cover (4) of the quartz lamp light box is made of high-temperature ceramic material, and the side wall (5) of the quartz lamp light box is made of quartz glass, and a heat-resistant reflective coating material is coated on the inside to enhance the useful power of the quartz lamp.

5. The independent multi-point quartz lamp thermal assessment device based on focused heating according to claim 1, characterized in that: The sheet metal outer cover box body (1) is made by bending a stainless steel sheet.

6. The independent multi-point quartz lamp thermal assessment device based on focused heating according to claim 1, characterized in that: Two front and rear sheet metal box side wall surface slots (9) are also provided on the side wall of the sheet metal outer casing (1) for inserting a piece of heat-insulating mullite to place a test piece on top of the mullite and conduct a heating experiment inside the sheet metal outer casing (1).

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