Low-oxygen environment box of radiation heating device and control method of low-oxygen environment box

Abstract

The invention belongs to the field of high-temperature heat intensity tests, and particularly relates to a low-oxygen environment box of a radiation heating device and a control method of the low-oxygen environment box. The low-oxygen environment box of the radiation heating device is composed of the external environment box and the internal heating device, the quartz lamp radiation heating device is installed in the environment box, nitrogen is injected into the environment box through the gas path connector in the bakelite plate, so that a low-oxygen environment is kept in the environment box, and the oxygen content in the environment box is controlled by adjusting the gas inlet and exhaust amount; the device is used for testing the thermal performance of a test piece in a low-oxygen environment. A test piece is installed in a heat insulation frame, the heat insulation frame is installed on a water cooling plate through a clamping groove, the water cooling plate can be driven by a supporting plate to slide along a guide rail, the distance between the test piece and a quartz lamp tube can be conveniently adjusted, and rapid replacement of the test piece is achieved. The front side baffle of the environment box is a bakelite plate and is connected with the outside through a circuit interface, a water path interface, a gas path interface and a measurement wiring board on the bakelite plate.

Description

Technical Field

[0001] The present application belongs to the field of high temperature thermal strength testing, and in particular relates to a low oxygen environment box of a radiation heating device and a control method thereof. Background Art

[0002] In view of the difference in the response of the ground test environment and the flight service environment of hypersonic aircraft throughout the whole process, there are differences in the degree of oxidation of the test piece, the ablation state, the thermal physical property response of the composite material, etc. It is necessary to carry out low-oxygen environment tests of hypersonic aircraft at different flight altitudes in ground tests, so as to accurately reflect the time cumulative effect of the environment on the structural response during the flight in the ground test, and improve the reference value of the ground test results. When the existing quartz lamp radiation heating device is used for low-oxygen environment testing, it is necessary to move the quartz lamp heating device to a vacuum tank for vacuuming, which has problems such as inconvenient replacement of test pieces, high operating costs, and long debugging preparation cycle.

[0003] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Summary of the invention

[0004] The purpose of the present application is to provide a low oxygen environment box of a radiation heating device and a control method thereof to solve at least one problem existing in the prior art.

[0005] The technical solution of this application is:

[0006] A first aspect of the present application provides a low oxygen environment box of a radiation heating device, comprising:

[0007] A base plate, on which a guide rail is arranged;

[0008] A support frame, wherein the support frame is fixedly mounted on the base plate;

[0009] A guide bar, the guide bar is fixedly mounted on the support frame through a ceramic bushing, a quartz lamp is mounted on the guide bar, the guide bar has a heating circuit, the heating circuit has a positive electrode and a negative electrode, and the guide bar is also provided with a first water cooling pipeline, the first water cooling pipeline has a first water inlet and a first water outlet;

[0010] A support plate, the bottom of which is mounted on the guide rail via a slider;

[0011] A water-cooling plate, the water-cooling plate is fixedly mounted on the support plate, a test piece is mounted on the water-cooling plate, and a second water-cooling pipeline is also arranged on the water-cooling plate;

[0012] A water-cooling cover plate, the water-cooling cover plate being welded to the water-cooling plate, and the water-cooling cover plate being provided with a second water inlet and a second water outlet communicating with the second water-cooling pipeline;

[0013] An environmental box, the environmental box is fixedly mounted on the base plate, and an exhaust port is provided on the environmental box;

[0014] An exhaust fan, wherein the exhaust fan is arranged directly above the exhaust port;

[0015] The bakelite board is fixedly mounted on the front side of the environmental box. The bakelite board, the base plate and the environmental box together form a closed cavity. Other components on the base plate are contained in the closed cavity. The bakelite board is provided with a circuit interface, a water interface and a gas interface, wherein:

[0016] The circuit interface is connected to the positive electrode and the negative electrode of the heating circuit through a cable;

[0017] The water channel interface is connected to the first water inlet and the first water outlet of the first water cooling pipeline, and is connected to the second water inlet and the second water outlet of the second water cooling pipeline;

[0018] The gas circuit interface is connected to an external nitrogen supply pipeline.

[0019] In at least one embodiment of the present application, a heat insulation frame is installed on the water cooling plate through a slot, and a test piece is installed on the heat insulation frame.

[0020] In at least one embodiment of the present application, an observation window is provided on the environmental chamber.

[0021] In at least one embodiment of the present application, a square steel is provided on the outer edge of the bakelite board, and the square steel is fixedly connected to the environmental chamber by bolts.

[0022] In at least one embodiment of the present application, the circuit interface includes a fixed angle piece and a brass sheet, and the brass sheet is fixedly mounted on the bakelite board by the fixed angle piece.

[0023] In at least one embodiment of the present application,

[0024] A heat flow meter is arranged inside the closed cavity, and the heat flow meter has a measuring circuit;

[0025] A measurement wiring board is arranged on the bakelite board, and the measurement wiring board is connected to the measurement circuit.

[0026] In at least one embodiment of the present application,

[0027] The heat flow meter is provided with a third water cooling pipeline, and the third water cooling pipeline has a third water inlet and a third water outlet;

[0028] The water channel interface is connected to the third water inlet and the third water outlet of the third water cooling pipeline.

[0029] A second aspect of the present application provides a method for controlling a hypoxic environment box of a radiation heating device, based on the hypoxic environment box of the radiation heating device as described above, comprising:

[0030] The air intake volume entering the closed cavity through the air path interface is:

[0031] Q1=V1At

[0032]

[0033] Where V1 is the gas inflow velocity, A is the cross-sectional area of ​​the pipeline, t is the air intake time, and d is the inner diameter of the pipeline;

[0034] The exhaust volume discharged from the closed cavity through the exhaust port is:

[0035] Q2=V2St

[0036] Wherein, V2 is the gas outflow velocity, S is the exhaust port area, and t is the exhaust time;

[0037] The oxygen content in the closed chamber is controlled to be below 100 ppm or a fixed value by controlling the air intake and exhaust volumes.

[0038] The invention has at least the following beneficial technical effects:

[0039] The low oxygen environment box of the radiation heating device of the present application is designed to be a sealed environment box. Nitrogen is continuously input into the environment box, so that the environment box can always be kept in a low oxygen atmosphere, and heating tests of material-level test pieces in a low oxygen environment can be conveniently carried out. At the same time, a slide rail is designed, which can more conveniently control the distance between the test piece and the heater, making it easy to replace the test piece and carry out heating tests at different distances. In addition, an exhaust port and an exhaust fan are provided on the environment box, which are also applicable to thermal ablation tests. The smoke can be discharged, making it convenient to observe the heating conditions in the environment box. The oxygen content in the environment box is adjusted by controlling the intake and exhaust volume, and the minimum oxygen content can reach below 100 ppm. It can be widely used in many fields such as thermal strength tests, thermal physical property tests, thermal processing, and heat treatment production, effectively reducing the cost of use and improving efficiency and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of a radiation heating device according to an embodiment of the present application;

[0041] Figure 2is a schematic diagram of a low oxygen environment box according to one embodiment of the present application;

[0042] Figure 3 It is a schematic diagram of a bakelite board according to one embodiment of the present application.

[0043] in:

[0044] 1-support frame; 2-guide strip; 3-water cooling plate; 4-water cooling cover plate; 5-support plate; 6-slider; 7-guide rail; 8-ground plate; 9-environmental chamber; 10-observation window; 11-exhaust port; 12-exhaust fan; 13-bakelite board; 131-fixed angle piece; 132-brass sheet; 133-square steel; 134-water interface; 135-gas interface; 136-measurement terminal board. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the embodiment of this application will be described in more detail below in conjunction with the drawings in the embodiment of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be construed as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0047] The following is combined with Figures 1 to 3 This application is described in further detail.

[0048] The first aspect of the present application provides a low oxygen environment box for a radiation heating device, comprising: a base plate 8, a support frame 1, a guide bar 2, a support plate 5, a water cooling plate 3, a water cooling cover plate 4, an environment box 9, an exhaust fan 12 and a bakelite board 13.

[0049] Specifically, Figure 1As shown, a guide rail 7 is arranged on the ground plate 8. The support frame 7 includes a base fixed on the ground plate 8 and a mounting portion perpendicular to the ground plate 8, the mounting portion is U-shaped and is used to install the guide bar 2. The guide bar 2 is fixedly mounted on the mounting portion of the support frame 1 through a ceramic bushing, a quartz lamp is mounted on the guide bar 2, the guide bar 2 has a heating circuit, the heating circuit has a positive electrode and a negative electrode, and a first water cooling pipeline is also arranged on the guide bar 2, the first water cooling pipeline has a first water inlet and a first water outlet.

[0050] The support plate 5 is connected to the slider 6 by bolts, and the slider 6 is slidably installed on the guide rail 7; the water-cooling plate 3 is fixedly installed on the support plate 5 by welding, a test piece is installed on the water-cooling plate 3, and a second water-cooling pipeline is also provided on the water-cooling plate 3; the water-cooling cover plate 4 is fixedly connected to the water-cooling plate 3 by welding, and a metal pipe is welded on the water-cooling cover plate 4 as a second water inlet and a second water outlet connected to the second water-cooling pipeline.

[0051] In the preferred embodiment of the present application, four slots are provided on the side of the water cooling plate 3 facing the quartz lamp tube, the heat insulation frame is installed in the slots, and a mounting slot is provided in the center of the heat insulation frame, in which a 100mm×100mm flat test piece is installed. Through the cooperation of the slider 6 and the guide rail 7, and the bolt connection of the support plate 5 and the slider 6, the distance between the test piece and the quartz lamp tube can be easily adjusted, and the test piece can be quickly replaced.

[0052] like Figure 2 As shown, the environmental box 9 is fixedly mounted on the base plate 8, and two exhaust ports 11 are provided on the environmental box 9; an exhaust fan 12 is arranged directly above the exhaust port 11, and the exhaust volume can be controlled by adjusting the exhaust speed of the exhaust fan 12.

[0053] In a preferred embodiment of the present application, observation windows 10 are provided on both sides of the environmental chamber 9, and the high-temperature glass is fixed to the environmental chamber 9 by two flange rings, so that the state of the test piece can be observed and recorded at any time during the test.

[0054] Further, such as Figure 3 As shown, the bakelite board 13 is fixedly installed on the front side of the environmental box 9, and the bakelite board 13, the base plate 8 and the environmental box 9 together form a closed cavity, and the other components on the base plate 8 are all contained inside the closed cavity. The bakelite board 13 is provided with a circuit interface, a water channel interface 134 and a gas channel interface 135, wherein the circuit interface is connected to the positive and negative electrodes of the heating circuit through a cable; the water channel interface 134 is connected to the first water inlet and the first water outlet of the first water cooling pipeline, and is connected to the second water inlet and the second water outlet of the second water cooling pipeline; the gas channel interface 135 is connected to an external nitrogen supply pipeline.

[0055] In a preferred embodiment of the present application, a square steel 133 is provided on the outer edge of the bakelite board 13 , and the square steel 133 is fixedly connected to the environmental chamber 9 by bolts.

[0056] In this embodiment, two circuit interfaces are provided on the bakelite board 13, and the circuit interfaces include a fixed angle piece 131 and a brass piece 132, and the brass piece 132 is fixedly mounted on the bakelite board 13 through the fixed angle piece 131. The two circuit interfaces are respectively connected to the positive electrode and the negative electrode of the heating circuit.

[0057] In this embodiment, a heat flux meter is arranged inside the closed cavity, and the heat flux meter has a measuring circuit. A measuring terminal board 136 is fixed to the bakelite board 13 by bolts. The measuring terminal board 136 is connected to the measuring circuit. The internal measuring line is connected to the outside of the environmental box 9 through the measuring terminal board 136, and the airtightness of the environmental box 9 is ensured.

[0058] In this embodiment, six water channel interfaces 134 are provided on the bakelite board 13, of which two water channel interfaces 134 are connected to the first water inlet and the first water outlet of the first water cooling pipeline, and the other two water channel interfaces 134 are connected to the second water inlet and the second water outlet of the second water cooling pipeline. There are water cooling pipelines inside the water cooling plate 3 and the guide strip 2, and cooling with cooling water can prevent the material from high temperature deformation and failure, and the test can be repeated. In addition, a third water cooling pipeline is provided on the heat flux meter, and the third water cooling pipeline has a third water inlet and a third water outlet. The last two water channel interfaces 134 are connected to the third water inlet and the third water outlet of the third water cooling pipeline.

[0059] In this embodiment, two gas path interfaces 135 are provided on the bakelite board 13, both of which are nitrogen gas inlets. When controlling the oxygen content in the environmental box 9, one or two of them can be opened to control the air intake volume.

[0060] The low oxygen environment box of the radiation heating device of the present application is composed of an external environment box 9 and an internal heating device. The quartz lamp radiation heating device is installed in the environment box 9. Nitrogen is injected into the environment box 9 through the gas path interface 135 on the bakelite board 13 to maintain a low oxygen environment in the environment box 9. By adjusting the intake and exhaust volume, the oxygen content in the environment box 9 is controlled, which is used for thermal performance testing of test pieces under low oxygen environment; the test piece is installed in an insulation frame, and the insulation frame is installed on the water cooling plate 3 with a card slot. The water cooling plate 3 can slide along the guide rail 7 driven by the support plate 5, which is convenient for adjusting the distance between the test piece and the quartz lamp tube, and realizing rapid replacement of the test piece; the front baffle of the environment box 9 is a bakelite board 13, which is connected to the outside through the circuit interface, water path interface 134, gas path interface 135 and measurement terminal board 136 on the bakelite board 13.

[0061] Based on the hypoxic environment box of the above-mentioned radiation heating device, the second aspect of the present application provides a control method of the hypoxic environment box of the radiation heating device, comprising:

[0062] The amount of air entering the closed cavity through the air path interface 135 is:

[0063] Q1=V1At

[0064]

[0065] Where V1 is the gas inflow velocity, A is the cross-sectional area of ​​the pipeline, t is the air intake time, and d is the inner diameter of the pipeline;

[0066] The exhaust volume discharged from the closed cavity through the exhaust port 11 is:

[0067] Q2=V2St

[0068] Wherein, V2 is the gas outflow velocity, S is the exhaust port area, and t is the exhaust time;

[0069] The oxygen content in the closed chamber is controlled to be below 100 ppm or a fixed value by controlling the air intake and exhaust volumes.

[0070] In a specific embodiment of the present application, the air intake in the environmental box 9 is mainly controlled by two air path interfaces 135 on the bakelite board 13. The two air path interfaces 135 are 4-point internal and external threaded joints with an outer diameter of M22 and an inner diameter of M18. One or both of them can be opened at the same time to control the air intake according to the oxygen content requirements in the environmental box 9. In this embodiment, the gas inflow speed V1 is related to the pressure in the pipeline. The pressure of nitrogen in the metal hose is 4.9-9.8Mpa, and the flow rate is 2-5m / s. Two exhaust ports 11 are left above the environmental box 9. An exhaust fan 12 is installed directly above the exhaust port 11. The exhaust speed of the exhaust fan 12 can be adjusted to control the exhaust volume. In this embodiment, the area S of the exhaust port 11 is 100×5mm 2 .

[0071] In this embodiment, the volume of the environmental box 9 is 1000mm×700mm×700mm. When conducting the hypoxic environment test, the two air inlets are opened first. When the gas inflow speed of the air inlet is 2m / s, it takes 481s for nitrogen to fill the environmental box 9. At this time, the oxygen content in the environmental box 9 is almost 0. Nitrogen is continuously filled into the environmental box 9, and the exhaust fan 12 is turned on at the same time. The area of ​​the exhaust port 11 is S=1000mm. 2 , intake duct cross-sectional area A = 81πmm 2, when the two air inlets 11 are opened at the same time, the area of ​​the exhaust port 11 is 1.96 times the cross-sectional area of ​​the air inlet duct, so when the air inlet speed is twice the speed of the exhaust fan 12, the oxygen content in the environmental box 9 can be kept stable below 100ppm, and a low oxygen environment is constructed in the environmental box 9. If the oxygen content in the environmental box 9 is to be quantitatively maintained at 3%, 5% or other percentages, one is to change the nitrogen filling time of the air inlet so that the oxygen content in the environmental box 9 is maintained at a certain value at the beginning, and set the exhaust speed when the exhaust fan 12 is turned on to 0.5 times the air intake speed of the air inlet. At this time, the intake volume and the exhaust volume are equal, and the oxygen content in the environmental box 9 is always maintained at a certain value; the second is to fill the air inlet with nitrogen at the beginning so that the oxygen content in the environmental box 9 is below 100ppm, and when the exhaust fan 12 is turned on, the exhaust speed is made greater than the intake speed. After the oxygen content in the environmental box 9 reaches the target value, the exhaust fan 12 speed is adjusted to 0.5 times the air intake speed of the air inlet, and the oxygen content in the environmental box 9 is always maintained at a certain value.

[0072] The low oxygen environment box of the radiation heating device of the present application and the control method thereof have the following beneficial effects:

[0073] a. It provides a low-oxygen test environment, gets rid of the size limitation of the vacuum tank, and can realize the rapid replacement of test pieces, significantly improving the use efficiency;

[0074] b. The test piece is installed in the insulation frame, and the insulation frame is installed on the water-cooling plate 3 by means of a slot. The slider 6 at the bottom of the water-cooling plate 3 can slide on the guide rail 7 to facilitate the adjustment of the distance between the test piece and the heater;

[0075] c. By adjusting the air intake through the air inlet on the bakelite board 13 and controlling the exhaust volume through the exhaust port 11 and the exhaust fan 12 at the top of the environmental box 9, the oxygen content in the environmental box 9 can be controlled to reach a stable state;

[0076] d. There are water cooling pipes inside the water cooling plate 3 and the guide strip 2, and cooling water is passed through them for cooling, which can prevent the material from deforming and failing due to high temperature.

[0077] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A low oxygen environment box for a radiation heating device, characterized in that: include: A base plate (8), wherein a guide rail (7) is arranged on the base plate (8); A supporting frame (1), wherein the supporting frame (1) is fixedly mounted on the base plate (8); A guide bar (2), the guide bar (2) being fixedly mounted on the support frame (1) via a ceramic bushing, a quartz lamp being mounted on the guide bar (2), the guide bar (2) having a heating circuit, the heating circuit having a positive electrode and a negative electrode, and the guide bar (2) also being provided with a first water cooling pipeline, the first water cooling pipeline having a first water inlet and a first water outlet; A support plate (5), the bottom of the support plate (5) being mounted on the guide rail (7) via a slider (6); A water-cooling plate (3), the water-cooling plate (3) being fixedly mounted on the support plate (5), a test piece being mounted on the water-cooling plate (3), and a second water-cooling pipeline being further arranged on the water-cooling plate (3); A water-cooling cover plate (4), the water-cooling cover plate (4) being welded to the water-cooling plate (3), and the water-cooling cover plate (4) being provided with a second water inlet and a second water outlet which are in communication with the second water-cooling pipeline; An environmental box (9), the environmental box (9) being fixedly mounted on the base plate (8), and the environmental box (9) being provided with an exhaust port (11); an exhaust fan (12), the exhaust fan (12) being arranged directly above the exhaust port (11); A bakelite board (13), the bakelite board (13) is fixedly mounted on the front side of the environmental box (9), the bakelite board (13), the base board (8) and the environmental box (9) together form a closed cavity, and other components on the base board (8) are accommodated inside the closed cavity, and the bakelite board (13) is provided with a circuit interface, a water interface (134) and a gas interface (135), wherein: The circuit interface is connected to the positive electrode and the negative electrode of the heating circuit through a cable; The water channel interface (134) is connected to a first water inlet and a first water outlet of the first water cooling pipeline, and is connected to a second water inlet and a second water outlet of the second water cooling pipeline; The gas circuit interface (135) is connected to an external nitrogen supply pipeline.

2. The low oxygen environment box of the radiation heating device according to claim 1, characterized in that: A heat insulation frame is installed on the water cooling plate (3) via a slot, and a test piece is installed on the heat insulation frame.

3. The low oxygen environment box of the radiation heating device according to claim 1, characterized in that: The environmental box (9) is provided with an observation window (10).

4. The low oxygen environment box of the radiation heating device according to claim 1, characterized in that: The outer edge of the bakelite board (13) is provided with square steel (133), and the square steel (133) is fixedly connected to the environmental box (9) by bolts.

5. The low oxygen environment box of the radiation heating device according to claim 1, characterized in that: The circuit interface comprises a fixed angle piece (131) and a brass piece (132), and the brass piece (132) is fixedly mounted on the bakelite board (13) via the fixed angle piece (131).

6. The low oxygen environment box of the radiation heating device according to claim 1, characterized in that: A heat flow meter is arranged inside the closed cavity, and the heat flow meter has a measuring circuit; A measurement wiring board (136) is provided on the bakelite board (13), and the measurement wiring board (136) is connected to the measurement circuit.

7. The low oxygen environment box of the radiation heating device according to claim 6, characterized in that: The heat flow meter is provided with a third water cooling pipeline, and the third water cooling pipeline has a third water inlet and a third water outlet; The water channel interface (134) is connected to the third water inlet and the third water outlet of the third water cooling pipeline.

8. A method for controlling a hypoxic environment box of a radiation heating device, based on the hypoxic environment box of the radiation heating device according to any one of claims 1 to 7, characterized in that: include: The amount of air entering the closed cavity through the air path interface (135) is: Q1=V1At Where V1 is the gas inflow velocity, A is the cross-sectional area of ​​the pipeline, t is the air intake time, and d is the inner diameter of the pipeline; The exhaust volume discharged from the closed cavity through the exhaust port (11) is: Q2=V2St Wherein, V2 is the gas outflow velocity, S is the exhaust port area, and t is the exhaust time; The oxygen content in the closed chamber is controlled to be below 100 ppm or a fixed value by controlling the air intake and exhaust volumes.

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