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

Abstract

The application belongs to the field of high-temperature heat strength test, and particularly relates to a low-oxygen environment box of a radiation heating device and a control method thereof. The low-oxygen environment box of the radiation heating device comprises an external environment box and an internal heating device, a quartz lamp radiation heating device is installed in the environment box, nitrogen is injected into the environment box through a gas path interface on a bakelite plate to maintain a low-oxygen environment in the environment box, the oxygen content in the environment box is controlled by adjusting the air inlet and outlet volume, and the low-oxygen environment box is used for heat performance test of a test piece in a low-oxygen environment; the test piece is installed in a heat insulation frame, the heat insulation frame is installed on a water cooling plate by means of a clamping groove, the water cooling plate can slide along a guide rail under the drive of a support plate, the distance between the test piece and the quartz lamp tube is conveniently adjusted, and the test piece is quickly replaced; a front side baffle of the environment box is a bakelite plate, and the bakelite plate is connected with the outside through a circuit interface, a water path interface, a gas path interface and a measurement connection plate.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of high-temperature heat strength test, and particularly relates to a low-oxygen environment box of a radiation heating device and a control method thereof. BACKGROUND

[0002] In view of the difference between the ground test environment and the flight service environment of a hypersonic aircraft, there are differences in the oxidation degree, ablation state and thermal physical response of the test piece, and it is necessary to carry out low-oxygen environment test of the hypersonic aircraft at different altitudes in the ground test, so as to accurately reflect the time accumulation effect of the environment on the structure response in the flight process and improve the reference value of the ground test results. When the existing quartz lamp radiation heating device is used for low-oxygen environment test, the quartz lamp heating device needs to be moved into the vacuum tank for vacuumization, which has problems such as inconvenient test piece replacement, high operation cost and long preparation period.

[0003] Therefore, it is desirable to have a technical solution to overcome or at least alleviate at least one of the aforementioned deficiencies of the prior art. SUMMARY

[0004] The application aims 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 the application is as follows:

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

[0007] A ground plate is provided with a guide rail;

[0008] A support frame is fixedly installed on the ground plate;

[0009] A flow guide strip is fixedly installed on the support frame through a ceramic bushing, a quartz lamp tube is installed on the flow guide strip, the flow guide strip has a heating circuit, the heating circuit has a positive electrode and a negative electrode, and a first water cooling pipeline is further provided on the flow guide strip, the first water cooling pipeline has a first water inlet and a first water outlet;

[0010] A support plate is installed on the guide rail through a sliding block at the bottom of the support plate;

[0011] A water cooling plate is fixedly installed on the support plate, a test piece is installed on the water cooling plate, and a second water cooling pipeline is further provided on the water cooling plate;

[0012] A water-cooled cover plate is welded to the water-cooled plate, and a second water inlet and a second water outlet are arranged on the water-cooled cover plate and communicate with the second water-cooled pipeline.

[0013] An environmental box is fixedly installed on the foundation plate, and an exhaust port is arranged on the environmental box.

[0014] An exhaust fan is arranged directly above the exhaust port.

[0015] A bakelite plate is fixedly installed on the front side of the environmental box, and the bakelite plate, the foundation plate and the environmental box jointly form a closed cavity, other elements on the foundation plate are accommodated in the closed cavity, and a circuit interface, a waterway interface and an airway interface are arranged on the bakelite plate, wherein

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

[0017] The waterway interface is connected with the first water inlet and the first water outlet of the first water-cooled pipeline and the second water inlet and the second water outlet of the second water-cooled pipeline.

[0018] The airway interface is connected with an external nitrogen supply pipeline.

[0019] In at least one embodiment of the present application, a heat insulation frame is installed on the water-cooled plate through a clamping groove, 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 arranged on the environmental box.

[0021] In at least one embodiment of the present application, square steels are arranged at the outer edges of the bakelite plate, and the square steels are fixedly connected with the environmental box through bolts.

[0022] In at least one embodiment of the present application, the circuit interface comprises a fixed corner piece and a brass piece, and the brass piece is fixedly installed on the bakelite plate through the fixed corner piece.

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

[0024] A heat flow meter is arranged in the closed cavity, and the heat flow meter has a measurement circuit.

[0025] A measurement terminal block is arranged on the bakelite plate and connected with 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 having a third water inlet and a third water outlet.

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

[0029] The second aspect of the present application provides a low-oxygen environment box control method of a radiation heating device, based on the low-oxygen environment box of the radiation heating device as described above, comprising:

[0030] The amount of gas entering the closed cavity through the gas path interface is:

[0031]

[0032]

[0033] Wherein, V1 is the gas inflow speed, A is the pipeline cross-sectional area, t is the gas inlet time, and d is the pipeline inner diameter;

[0034] The amount of gas discharged from the closed cavity through the exhaust port is:

[0035]

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

[0037] The oxygen content in the closed cavity is controlled to be below 100 ppm or a fixed value by controlling the gas inlet amount and the gas outlet amount.

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

[0039] The low-oxygen environment box of the radiation heating device of the present application designs a sealed environment box, continuously inputs nitrogen gas in the environment box, can keep the environment box in a low-oxygen atmosphere at all times, and can conveniently carry out heating tests of material grade test pieces in a low-oxygen environment. Meanwhile, a sliding rail is designed, which can more conveniently control the distance between the test piece and the heater, facilitate replacement of the test piece, and carry out heating tests at different distances. In addition, an exhaust port and an exhaust fan are arranged on the environment box, which is also applicable to hot ablation tests, can discharge smoke, and is convenient for observing the heating condition in the environment box. The oxygen content in the environment box is adjusted by controlling the gas inlet and outlet amounts, and the minimum oxygen content can reach below 100 ppm, which can be widely applied to many fields such as thermal intensity tests, thermal physical property tests, and thermal processing and heat treatment production, effectively reduces the use cost, and improves the use efficiency and reliability. BRIEF DESCRIPTION OF DRAWINGS

[0040] Fig. 1 is a schematic diagram of a radiation heating device of an embodiment of the present application;

[0041] Fig. 2 is a schematic diagram of a low-oxygen environment box according to an embodiment of the present application;

[0042] Fig. 3 is a schematic diagram of a bakelite plate according to an embodiment of the present application.

[0043] wherein:

[0044] 1-support frame; 2-flow guide strip; 3-water-cooled plate; 4-water-cooled cover plate; 5-supporting plate; 6-sliding block; 7-rail; 8-foundation plate; 9-environment box; 10-observation window; 11-exhaust port; 12-exhaust fan; 13-bakelite plate; 131-fixing corner piece; 132-brass piece; 133-square steel; 134-waterway interface; 135-airway interface; 136-measuring terminal block. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings. In the drawings, the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are some of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation on the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0047] The drawings will be described below in conjunction with the Figs. 1 to 3 The present application will be described in further detail.

[0048] The first aspect of the present application provides a low-oxygen environment box of a radiation heating device, comprising: a foundation plate 8, a support frame 1, a flow guide strip 2, a supporting plate 5, a water-cooled plate 3, a water-cooled cover plate 4, an environment box 9, an exhaust fan 12 and a bakelite plate 13.

[0049] Specifically, as Fig. 1As shown in the drawings, the base plate 8 is provided with a guide rail 7. The support frame 1 includes a base fixed on the base plate 8 and a mounting portion perpendicular to the base plate 8, the mounting portion is in a U shape and used for mounting the flow guide strip 2. The flow guide strip 2 is fixedly mounted on the mounting portion of the support frame 1 through a ceramic bushing, a quartz lamp is mounted on the flow guide strip 2, the flow guide strip 2 has a heating circuit with a positive electrode and a negative electrode, and the flow guide strip 2 is further provided with a first water cooling pipe line having a first water inlet and a first water outlet.

[0050] The support plate 5 is connected with the sliding block 6 through bolts, and the sliding block 6 is slidingly mounted on the guide rail 7. The water cooling plate 3 is fixedly mounted on the support plate 5 through welding, and a test piece is mounted on the water cooling plate 3. The water cooling plate 3 is further provided with a second water cooling pipe line. The water cooling cover plate 4 is fixedly connected with the water cooling plate 3 through welding, and a metal pipe is welded on the water cooling cover plate 4 as a second water inlet and a second water outlet communicating with the second water cooling pipe line.

[0051] In the preferred embodiment of the present application, four clamping grooves are arranged on the side of the water cooling plate 3 facing the quartz lamp, and a heat insulation frame is mounted in the clamping grooves. A mounting groove is arranged in the center of the heat insulation frame, and a 100mm*100mm flat plate type test piece is mounted in the mounting groove. Through the cooperation of the sliding block 6 and the guide rail 7 and the bolt connection of the support plate 5 and the sliding block 6, the distance between the test piece and the quartz lamp can be conveniently adjusted, and the test piece can be quickly replaced.

[0052] As shown in the drawings, Fig. 2 The environmental box 9 is fixedly mounted on the base plate 8, and two exhaust outlets 11 are arranged on the environmental box 9. The exhaust fan 12 is arranged directly above the exhaust outlet 11, and the exhaust amount can be controlled by adjusting the air extraction speed of the exhaust fan 12.

[0053] In the preferred embodiment of the present application, observation windows 10 are arranged on the two sides of the environmental box 9, and two flange rings are used to fix the high-temperature glass on the environmental box 9. During the test, the state of the test piece can be observed at any time and video recording can be performed.

[0054] Further, as shown in the drawings, Fig. 3 The bakelite plate 13 is fixedly mounted on the front side of the environmental box 9, and the bakelite plate 13, the base plate 8 and the environmental box 9 jointly form a closed cavity, and other elements on the base plate 8 are accommodated in the closed cavity. The bakelite plate 13 is provided with a circuit interface, a waterway interface 134 and an airway interface 135. The circuit interface is connected with the positive electrode and the negative electrode of the heating circuit through a cable. The waterway interface 134 is connected with the first water inlet and the first water outlet of the first water cooling pipe line and the second water inlet and the second water outlet of the second water cooling pipe line. The airway interface 135 is connected with an external nitrogen supply pipe line.

[0055] In the preferred embodiment of the present application, the outer edge of the bakelite plate 13 is provided with square steel 133, which is fixedly connected with the environmental box 9 through bolts.

[0056] In the present embodiment, two circuit interfaces are provided on the bakelite plate 13, which include fixed corner pieces 131 and brass pieces 132. The brass pieces 132 are fixedly installed on the bakelite plate 13 through the fixed corner pieces 131. The two circuit interfaces are respectively connected with the positive and negative electrodes of the heating circuit.

[0057] In the present embodiment, a hot-wire anemometer is arranged inside the closed cavity, which has a measurement circuit. A measurement terminal block 136 is fixedly arranged on the bakelite plate 13 through bolts, and is connected with the measurement circuit. The internal measurement wires are connected to the outside of the environmental box 9 through the measurement terminal block 136, and the air tightness of the environmental box 9 is ensured.

[0058] In the present embodiment, six waterway interfaces 134 are arranged on the bakelite plate 13. Two of the waterway interfaces 134 are connected with the first water inlet and the first water outlet of the first water cooling pipeline, and the other two waterway interfaces 134 are connected with the second water inlet and the second water outlet of the second water cooling pipeline. The water cooling pipelines are arranged inside the water cooling plate 3 and the flow guide strip 2, and cooling water is used for cooling, which can prevent the material from deforming and failing due to high temperature, and the test can be repeatedly performed. In addition, a third water cooling pipeline is arranged on the hot-wire anemometer, which has a third water inlet and a third water outlet. The last two waterway interfaces 134 are connected with the third water inlet and the third water outlet of the third water cooling pipeline.

[0059] In the present embodiment, two gasway interfaces 135 are arranged on the bakelite plate 13, which are nitrogen gas inlets. When the oxygen content in the environmental box 9 is controlled, one or both of the gasway interfaces 135 can be opened to control the gas amount.

[0060] The low-oxygen environmental box of the radiation heating device of the present application is composed of an external environmental box 9 and an internal heating device. The quartz lamp radiation heating device is installed in the environmental box 9. Nitrogen gas is injected into the environmental box 9 through the gasway interfaces 135 on the bakelite plate 13, so that a low-oxygen environment is maintained in the environmental box 9. By adjusting the gas amount, the oxygen content in the environmental box 9 is controlled, which is used for testing the thermal performance of the test piece in a low-oxygen environment. The test piece is installed in the heat insulation frame, which is installed on the water cooling plate 3 through a clamping groove. The water cooling plate 3 can slide along the guide rail 7 under the drive of the support plate 5, which facilitates adjusting the distance between the test piece and the quartz lamp tube, and realizes the rapid replacement of the test piece. The front side baffle of the environmental box 9 is the bakelite plate 13, which is connected with the outside through the circuit interfaces, the waterway interfaces 134, the gasway interfaces 135 and the measurement terminal block 136 on the bakelite plate 13.

[0061] Based on the above-mentioned low-oxygen environmental box of the radiation heating device, the second aspect of the present application provides a control method of a low-oxygen environmental box of a radiation heating device, which comprises:

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

[0063]

[0064]

[0065] Wherein, V1 is the gas inflow rate, A is the pipe cross-sectional area, t is the gas inlet time, d is the pipe diameter;

[0066] The amount of gas discharged from the closed cavity through the exhaust port 11 is:

[0067]

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

[0069] The oxygen content in the closed cavity is controlled to be below 100 ppm or a fixed value by controlling the amount of gas entering and the amount of gas being discharged.

[0070] In one specific embodiment of the present application, the amount of gas entering the environmental box 9 is mainly controlled through the two gas path interfaces 135 on the bakelite plate 13. The two gas path interfaces 135 are 4-inch 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 to control the amount of gas entering according to the oxygen content requirement in the environmental box 9. In this embodiment, the gas inflow rate V1 is related to the pressure in the pipe. The pressure of nitrogen gas in the metal hose is 4.9-9.8 Mpa, and the flow rate is 2-5 m / s. Two exhaust ports 11 are left above the environmental box 9, and an exhaust fan 12 is installed directly above the exhaust port 11. The exhaust amount can be controlled by adjusting the exhaust speed of the exhaust fan 12. In this embodiment, the area S of the exhaust port 11 is 100×5 mm 2 .

[0071] In this embodiment, the volume of the environmental box 9 is 1000 mm×700 mm×700 mm. When conducting a low-oxygen environment test, the two gas inlets are first opened. When the gas inflow rate of the gas inlet is 2 m / s, it takes 481 s for nitrogen gas to fill the environmental box 9, and at this time the oxygen content in the environmental box 9 is almost 0. Continue to fill nitrogen gas into the environmental box 9, and at the same time open the exhaust fan 12. The area S of the exhaust port 11 is 1000 mm 2 , the cross-sectional area A of the gas inlet pipe is 81π mm 2, two exhaust port 11 open simultaneously exhaust port 11 area is the intake pipe cross-sectional area of 1.96 times, so the intake port speed should be 2 times the exhaust fan 12 speed, the environment box 9 can maintain oxygen content stable at 100 ppm or less, to achieve the low oxygen environment construction in the environment box 9. If you want to keep the oxygen content in the environment box 9 is 3%, 5% or other percentage, one is to change the intake port nitrogen filling time, so that the environment box 9 initially oxygen content is maintained at a certain value, the exhaust fan 12 is opened to the exhaust speed is set to 0.5 times the intake port intake speed, at this time the intake and exhaust volume is equal, the oxygen content in the environment box 9 is maintained at a certain value; Two is to start the intake port is always filled with nitrogen, so that the oxygen content in the environment box 9 reaches 100 ppm or less, when the exhaust fan 12 is opened to the exhaust speed is greater than the intake speed, the oxygen content in the environment box 9 reaches the target value, adjust the exhaust fan 12 speed to 0.5 times the intake port intake speed, the oxygen content in the environment box 9 is maintained at a certain value.

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

[0073] a. A low oxygen test environment is provided, which is free from the size limitation of the vacuum tank, and the test piece can be quickly replaced, thereby significantly improving the use efficiency.

[0074] b. The test piece is installed in the heat insulation frame, the heat insulation frame is installed on the water cooling plate 3 by means of the clamping groove, and the sliding block 6 at the bottom of the water cooling plate 3 can slide on the guide rail 7, thereby facilitating the adjustment of the distance between the test piece and the heater.

[0075] c. The oxygen content in the environment box 9 can be controlled to reach a stable state by adjusting the intake amount through the intake port on the bakelite plate 13 and controlling the exhaust amount by the exhaust port 11 at the top of the environment box 9 and the exhaust fan 12.

[0076] d. The water cooling pipe inside the water cooling plate 3 and the guide strip 2 can be cooled by cooling water, thereby preventing high temperature deformation and failure of the material.

[0077] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A low-oxygen environment box of a radiant heating device, characterized by, It includes: The ground plate (8) is provided with guide rails (7); Support frame (1), the support frame (1) is fixedly installed on the ground plate (8); The flow guide bar (2) is fixedly installed on the support frame (1) through the ceramic bushing, the quartz lamp tube is installed on the flow guide bar (2), the flow guide bar (2) has a heating circuit, the heating circuit has a positive and negative, the flow guide bar (2) is also provided with a first water cooling pipe, the first water cooling pipe has a first water inlet and a first water outlet; Support plate (5), the bottom of the support plate (5) is installed on the guide rail (7) through the sliding block (6); Water cooling plate (3), the water cooling plate (3) is fixedly installed on the support plate (5), the water cooling plate (3) is installed with test piece, the water cooling plate (3) is also provided with a second water cooling pipe; Water cooling cover plate (4), the water cooling cover plate (4) is welded with the water cooling plate (3), the water cooling cover plate (4) is provided with a second water inlet and a second water outlet which are communicated with the second water cooling pipe; Environmental box (9), the environmental box (9) is fixedly installed on the ground plate (8), the environmental box (9) is provided with an exhaust port (11); Exhaust fan (12), the exhaust fan (12) is arranged directly above the exhaust port (11); Bakelite plate (13), the bakelite plate (13) is fixedly installed on the front side of the environmental box (9), the bakelite plate (13), the ground plate (8) and the environmental box (9) form a closed cavity, other elements on the ground plate (8) are contained in the closed cavity, the bakelite plate (13) is provided with a circuit interface, a waterway interface (134) and an airway interface (135), wherein, The circuit interface is connected with the positive and negative of the heating circuit through the cable; The waterway interface (134) is connected with the first water inlet and the first water outlet of the first water cooling pipe, and is connected with the second water inlet and the second water outlet of the second water cooling pipe; The airway interface (135) is connected with the external nitrogen supply pipeline.

2. The low-oxygen environment case of a radiant heating apparatus according to claim 1, wherein The water cooling plate (3) is installed with a heat insulation frame through a clamping groove, and the test piece is installed on the heat insulation frame.

3. The low-oxygen environment case of a radiant heating apparatus according to claim 1, wherein The environmental box (9) is provided with an observation window (10).

4. The low-oxygen environment case of a radiant heating apparatus according to claim 1, wherein The outer edge of the bakelite plate (13) is provided with a square steel (133), and the square steel (133) is fixedly connected with the environmental box (9) through bolts.

5. The low-oxygen environment case of a radiant heating apparatus according to claim 1, wherein The circuit interface includes fixed angle sheet (131) and brass sheet (132), and the brass sheet (132) is fixedly installed on the bakelite plate (13) through the fixed angle sheet (131).

6. The low oxygen environment box of the radiant heating device according to claim 1, wherein, The closed cavity is provided with a heat flow meter, and the heat flow meter has a measurement circuit; The bakelite plate (13) is provided with a measurement terminal block (136), and the measurement terminal block (136) is connected with the measurement circuit.

7. The low oxygen environment box of the radiant heating device according to claim 6, wherein, The heat flow meter is provided with a third water cooling pipeline having a third water inlet and a third water outlet; The waterway interface (134) is connected with the third water inlet and the third water outlet of the third water cooling pipeline.

8. A method for controlling a low-oxygen environment chamber of a radiant heating apparatus, the low-oxygen environment chamber of the radiant heating apparatus according to any one of claims 1 to 7, characterized by, Comprise: The gas inflow into the closed cavity through the gasway interface (135) is: Q1=V1At Wherein, V1 is the gas inflow speed, A is the pipeline cross-sectional area, t is the gas inflow time, and d is the pipeline inner diameter; The gas outflow from the closed cavity through the gas outlet (11) is: Q2=V2St Wherein, V2 is the gas outflow speed, S is the gas outlet area, and t is the gas outflow time; The oxygen content in the closed cavity is controlled to be below 100 ppm or a fixed value by controlling the gas inflow and the gas outflow.

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