High-temperature graphite heating device

Abstract

The invention relates to the technical field of spacecraft ground high-temperature environment tests, in particular to a high-temperature graphite heating device which comprises a supporting frame, a cooling part, an electric connection part, an insulation heat conduction part and a graphite heater. The cooling part is mounted at the top of the support frame; the electric connection part is mounted at the top of the cooling part; the insulating heat conduction part is mounted between the electric connection part and the cooling part; the graphite heater is connected with the electric connection part; and the cooling part is used for cooling the electric connection part so as to reduce the heat transferred to the power supply wire by the electric connection part and prevent the insulation layer of the power supply wire from being damaged and melted, so that the risks of short circuit and open circuit are greatly reduced, and the potential safety hazard is reduced. The insulation heat conduction part has insulation and heat conduction functions, so that heat from the electric connection part can be quickly transmitted to the cooling part, the electric connection part and the cooling part are isolated, the potential of cooling water and a water supply pipeline is no longer the same as that of the graphite heater, and potential safety hazards are further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ground high-temperature environment testing of spacecraft, and in particular to a high-temperature graphite heating device. Background Art

[0002] Spacecraft must experience harsh aerodynamic heat or plume environments during supersonic flight, reentry, and landing / takeoff, and their surface temperatures are above 1000°C for a long time. At present, the main method is to install a thermal protection layer on the surface of the spacecraft to protect the main structure of the spacecraft and ensure that the temperature of the main structure of the spacecraft is within a reasonable operating temperature range. Therefore, conducting anti-insulation performance tests of spacecraft thermal protection layers on the ground is of great significance to ensure the safety of spacecraft in orbit. With the development of technological iterations, higher anti-insulation requirements (above 1800°C) are put forward for thermal protection layers, and the maximum loading temperature of infrared quartz lamp arrays is 1400°C due to the temperature resistance of their glass tube walls. Therefore, graphite heaters are currently used as heat sources in the temperature range above 1400°C to complete the ground high-temperature assessment test of the anti-insulation performance of spacecraft thermal protection layers.

[0003] When the graphite heater is working, it is connected to the wire and powered by an external power supply. The graphite heater converts electrical energy into internal energy through the resistive thermal effect. The large amount of heat generated can make the temperature of the graphite heater itself reach up to 3500℃. However, due to the good thermal conductivity of graphite, with a thermal conductivity coefficient of 129w / (m∙k), during its continuous high-temperature heating process, part of the heat will be conducted through the graphite heater to the power supply wire directly connected to it, which can easily cause the insulation layer of the power supply wire (the maximum temperature resistance is only 180℃) to be damaged or even melted, posing a great risk of short circuit and open circuit, and huge safety hazards in the case of high-power power supply.

[0004] Although the water-cooled electrode power supply method has become a recognized reliable power supply method, the water-cooled electrode is directly in contact or connected to the graphite heater, and the cooling water, water-cooled electrode and water supply pipeline are all at the same potential as the graphite heater. The power supply voltage of the graphite heater can reach 100V or above, while the human body safety voltage is only 60V, and there are still major safety hazards. Summary of the invention

[0005] The present invention provides a high-temperature graphite heating device, which is used to solve the problem that the water-cooled electrode power supply method still has great potential safety hazards.

[0006] The present invention provides a high-temperature graphite heating device, comprising: Support frame; A cooling unit, mounted on the top of the support frame; An electrical connection portion, mounted on the top of the cooling portion; An insulating heat-conducting portion, installed between the electrical connection portion and the cooling portion; The graphite heater is connected to the electrical connection portion.

[0007] In some embodiments, there are two support frames, which are arranged opposite to each other; There are two cooling parts, which are installed on the top of the support frame in a one-to-one correspondence with the two support frames; There are two electrical connection parts, which are installed on the top of the electrical connection part in a one-to-one correspondence with the two insulating heat-conducting parts; an insulating heat-conducting part is installed between each electrical connection part and a cooling part; The opposite sides of the graphite heater are respectively connected to the corresponding side electrical connecting parts.

[0008] In some embodiments, each cooling section comprises: The cooling box has a bottom fixedly connected to the top of the support frame, and an insulating heat-conducting part is installed on the top surface; a cooling medium flow channel is formed in the cooling box; The cooling medium flows into the pipe, which is connected to the cooling box; The cooling medium outflow pipe is connected to the cooling box.

[0009] In some of the embodiments, each electrical connection portion is a copper busbar, one side of which is fixedly connected to one side of the graphite heater.

[0010] In some of the embodiments, a wire connection groove is formed at one end of each electrical connection portion.

[0011] In some of the embodiments, overlapping edges are formed on two opposite sides of the graphite heater respectively; the overlapping edges on both sides can be overlapped on the electrical connection parts on the corresponding sides respectively.

[0012] In some of the embodiments, each insulating heat-conducting portion is an insulating heat-conducting plate, and the material is hexagonal boron nitride.

[0013] In some embodiments, it also includes: There are two first heat insulating parts; one of the first heat insulating parts is arranged between one of the support frames and one side of the graphite heater, and the other first heat insulating part is arranged between the other support frame and the other side of the graphite heater.

[0014] In some embodiments, it also includes: The second heat insulating part is arranged below the graphite heater.

[0015] The beneficial effects of the present invention are as follows: The high-temperature graphite heating device of the present invention is provided with a support frame, a cooling part, an electrical connection part, an insulating heat-conducting part and a graphite heater, and the support frame is used to support and fix the cooling part, the electrical connection part, the insulating heat-conducting part and the graphite heater. The electrical connection part is powered by an external power supply, and the graphite heater converts electrical energy into internal energy through the resistive thermal effect, so that the temperature of the graphite heater itself can reach up to 3500°C to heat the thermal protection layer of the spacecraft. The cooling part is used to cool the electrical connection part to reduce the heat transferred from the electrical connection part to the power supply wire, avoid damage and melting of the insulation layer of the power supply wire, thereby greatly reducing the risk of short circuit and open circuit, and reducing safety hazards. The insulating heat-conducting part has insulation and heat-conducting functions, which not only allows the heat from the electrical connection part to be quickly transferred to the cooling part, but also isolates the electrical connection part and the cooling part, so that the potential of the cooling water and water supply pipeline is no longer the same as the potential of the graphite heater, further reducing safety hazards. Under the premise of safe insulation and cooling, it is possible to reliably supply power to the high-temperature graphite heater for a long time, which has positive practical significance for the ground high-temperature assessment test of the thermal insulation performance of the thermal protection layer of spacecraft in the temperature range above 1400℃. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of some specific embodiments of a high-temperature graphite heating device of the present invention; Figure 2 yes Figure 1 Schematic diagrams of the internal structure of some specific embodiments of the insulating heat-conducting part in the high-temperature graphite heating device are shown.

[0017] In the attached drawings, 1, graphite heater; 2, electrical connection part; 3, insulating heat-conducting part; 31, upper heat-dissipating copper plate; 311, upper heat-conducting fin; 32, lower heat-dissipating copper plate; 321, lower heat-conducting fin; 33, heat-conducting cavity; 331, coolant adsorption part; 34, insulating heat-conducting pad; 4, cooling part; 5, second connecting part; 6, first connecting part; 8, first heat-insulating part; 9, supporting frame. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] As described in the background technology, although the water-cooled electrode power supply method has become a recognized reliable power supply method, the water-cooled electrode is directly in contact or connected to the graphite heater, and the cooling water, water-cooled electrode and water supply pipeline are all at the same potential as the graphite heater. The power supply voltage of the graphite heater can reach 100V or above, while the safety voltage for the human body is only 60V, and there are still major safety hazards.

[0020] To solve the above problems, refer to Figure 1 and Figure 2 The present invention provides a high-temperature graphite heating device, including a support frame 9, a cooling part 4, an electrical connection part 2, an insulating heat-conducting part 3 and a graphite heater 1. The cooling part 4 is installed on the top of the support frame 9. The electrical connection part 2 is installed on the top of the cooling part 4. The insulating heat-conducting part 3 is installed between the electrical connection part 2 and the cooling part 4. The graphite heater 1 is connected to the electrical connection part 2. The support frame 9 is used to support and fix the cooling part 4, the electrical connection part 2, the insulating heat-conducting part 3 and the graphite heater 1. The electrical connection part 2 is powered by an external power supply, and the graphite heater 1 converts electrical energy into internal energy through the resistive thermal effect, so that the temperature of the graphite heater 1 itself can reach up to 3500°C to heat the thermal protection layer of the spacecraft. The cooling part 4 is used to cool the electrical connection part 2 to reduce the heat transferred from the electrical connection part 2 to the power supply wire, avoid damage and melting of the insulation layer of the power supply wire, thereby greatly reducing the risk of short circuit and open circuit, and reducing safety hazards. The insulating heat-conducting part 3 has insulating and heat-conducting functions, which not only allows the heat from the electrical connection part 2 to be quickly transferred to the cooling part 4, but also isolates the electrical connection part 2 and the cooling part 4, so that the potential of the cooling water and the water supply pipeline is no longer the same as the potential of the graphite heater 1, further reducing the safety hazard. Under the premise of safe insulation cooling, the graphite heater 1 in a high temperature state can be powered reliably for a long time, which has positive practical significance for the ground high-temperature assessment test of the thermal insulation performance of the thermal protection layer of spacecraft in the temperature range above 1400°C.

[0021] Specifically, in the exemplary embodiment, there are two support frames 9, which are arranged opposite to each other. There are two cooling parts 4, which are installed on the top of the support frames 9 in a one-to-one correspondence with the two support frames 9. There are two electrical connection parts 2, which are installed on the top of the electrical connection parts 2 in a one-to-one correspondence with the two insulating heat-conducting parts 3. An insulating heat-conducting part 3 is installed between each electrical connection part 2 and a cooling part 4. The opposite sides of the graphite heater 1 are respectively connected to the corresponding side electrical connection parts 2. The positive pole of the external power supply is electrically connected to one of the electrical connection parts 2, and the negative pole is electrically connected to the other electrical connection part 2. By inputting current into the graphite heater 1, the graphite heater 1 is heated.

[0022] Specifically, in the exemplary embodiment, each cooling unit 4 includes a cooling box, a cooling medium inflow pipe, and a cooling medium outflow pipe. The bottom of the cooling box is fixedly connected to the top of the support frame 9 by screws. The top surface of the cooling box is fixed with an insulating heat-conducting part 3 and an electrical connection part 2 by a plurality of first connecting members 6. A cooling medium flow channel is formed in the cooling box. The cooling medium inflow pipe is connected to the cooling box and is used to input a cooling medium such as cooling water or cooling gas into the cooling box. The cooling medium outflow pipe is connected to the cooling box and is used to discharge the cooling medium in the cooling box.

[0023] Preferably, each first connecting member 6 comprises a stainless steel screw and a “T”-shaped ceramic insulating washer.

[0024] Preferably, a plurality of first connecting members 6 are arranged in a row.

[0025] Specifically, in the exemplary embodiment, each electrical connection portion 2 is a copper bar with good electrical conductivity. One side of each electrical connection portion 2 is fixedly connected to one side of the graphite heater 1 through a plurality of second connection members 5 .

[0026] Preferably, each second connecting member 5 is a graphite screw having good electrical conductivity.

[0027] Preferably, the plurality of second connecting members 5 on each side are arranged in a row.

[0028] Preferably, one end of each electrical connection portion 2 is formed with two or more wire connection grooves to facilitate assembly and disassembly of the power supply wire and the electrical connection portion 2 .

[0029] Specifically, in the exemplary embodiment, overlapping edges are formed on two opposite sides of the graphite heater 1. The overlapping edges on both sides can overlap the electrical connection parts 2 on the corresponding sides to improve the connection stability and position stability of the graphite heater 1.

[0030] In some embodiments, such as Figure 1 As shown, each insulating heat-conducting portion 3 is an insulating heat-conducting plate made of hexagonal boron nitride, which has the characteristics of high temperature resistance, insulation and high thermal conductivity.

[0031] In other embodiments, such as Figure 2As shown, each insulating heat-conducting part 3 includes an upper heat-distributing copper plate 31, a lower heat-distributing copper plate 32, a heat-conducting cavity 33 and an insulating heat-conducting pad 34. The upper heat-distributing copper plate 31 is fixedly connected to the bottom surface of the electrical connection part 2. A plurality of upper heat-conducting fins 311 are evenly formed at the bottom end of the upper heat-distributing copper plate 31 along the body length direction of the upper heat-distributing copper plate 31. The bottom surface of the lower heat-distributing copper plate 32 is fixedly connected to the top surface of the cooling box. A plurality of lower heat-conducting fins 321 are evenly formed at the top end of the lower heat-distributing copper plate along the body length direction of the lower heat-distributing copper plate. The plurality of lower heat-conducting fins 321 are alternately arranged with the plurality of upper heat-conducting fins 311. A heat-conducting cavity 33 is arranged between each lower heat-conducting fin 321 and an adjacent upper heat-conducting fin 311. One side of the heat-conducting cavity 33 is fixedly connected to one side of the lower heat-conducting fin 321. A cooling liquid adsorbing member 331 is installed on one side of each heat-conducting cavity 33 close to the upper heat-conducting fin 311. Cooling liquid is stored in the heat-conducting cavity 33. An insulating heat-conducting pad 34 is installed between each heat-conducting cavity 33 and the upper heat-conducting fin 311. The heat from the electrical connection part 2 is transferred to the upper heat-distributing copper plate 31, and the upper heat-distributing copper plate 31 distributes the heat to each upper heat-conducting fin 311. Each upper heat-conducting fin 311 transfers the heat to one side of each heat-conducting cavity 33 close to the upper heat-conducting fin 311 through the insulating heat-distributing pad 34. When the cooling liquid adsorbing member 331 is heated, the cooling liquid adsorbed on the cooling liquid adsorbing member 331 is vaporized and converted into cooling gas. The cooling gas transfers the heat to the corresponding lower heat-conducting fin 321, and is converted into cooling liquid that flows to the bottom of the inside of the heat-conducting cavity 33. Afterwards, the cooling liquid climbs with the help of the cooling liquid adsorbing member 331. And each lower heat-conducting fin 321 transfers the heat to the lower heat-distributing copper plate and the cooling box. It should be noted that the coolant adsorbing member 331 may be a porous structure such as a sponge. The coolant may be cooling water.

[0032] Specifically, in the exemplary embodiment, the high temperature graphite heating device further includes two first heat insulating parts 8 and a second heat insulating part. One of the first heat insulating parts 8 is arranged between one of the support frames 9 and one side of the graphite heater 1, and the other first heat insulating part 8 is arranged between the other support frame 9 and the other side of the graphite heater 1. In this way, it is possible to prevent the heated graphite heater 1 from transferring heat to the support frame 9 and the cooling part 4. The second heat insulating part is arranged below the graphite heater 1.

[0033] Preferably, each of the first heat insulating part 8 and the second heat insulating part may be a heat insulating board or a heat insulating water tank.

[0034] Preferably, each support frame 9 is a rectangular frame formed by welding a plurality of steel beams.

[0035] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high temperature graphite heating device, characterized in that: include: Support frame; A cooling unit, mounted on the top of the support frame; An electrical connection portion, mounted on the top of the cooling portion; an insulating heat-conducting portion, installed between the electrical connecting portion and the cooling portion; The graphite heater is connected to the electrical connection portion.

2. The high temperature graphite heating device according to claim 1, characterized in that: There are two support frames, which are arranged opposite to each other; There are two cooling parts, which are installed on the top of the support frame in a one-to-one correspondence with the two support frames; There are two electrical connection parts, which are installed on the top of the electrical connection parts in a one-to-one correspondence with the two insulating heat-conducting parts; one insulating heat-conducting part is installed between each electrical connection part and one cooling part; The opposite sides of the graphite heater are respectively connected to the electrical connection parts on the corresponding sides.

3. The high temperature graphite heating device according to claim 2, characterized in that: Each of the cooling units comprises: A cooling box, the bottom of which is fixedly connected to the top of the support frame, and the insulating heat-conducting part is installed on the top surface; a cooling medium flow channel is formed in the cooling box; A cooling medium inflow pipe is connected to the cooling box; The cooling medium outflow pipe is communicated with the cooling box.

4. The high temperature graphite heating device according to claim 2, characterized in that: Each of the electrical connection parts is a copper bar, one side of which is fixedly connected to one side of the graphite heater.

5. The high temperature graphite heating device according to claim 4, characterized in that: A wire connection groove is formed at one end of each of the electrical connection parts.

6. The high temperature graphite heating device according to claim 2, characterized in that: The graphite heater is provided with overlapping edges on two opposite sides respectively; the overlapping edges on the two sides can be overlapped on the electrical connection parts on the corresponding sides respectively.

7. The high temperature graphite heating device according to claim 2, characterized in that: Each of the insulating heat-conducting parts is an insulating heat-conducting plate, and the material is hexagonal boron nitride.

8. The high temperature graphite heating device according to claim 2, characterized in that: Also includes: There are two first heat insulating parts; one of the first heat insulating parts is arranged between one of the support frames and one side of the graphite heater, and the other first heat insulating part is arranged between the other support frame and the other side of the graphite heater.

9. The high temperature graphite heating device according to claim 2, characterized in that: Also includes: The second heat insulating part is arranged below the graphite heater.

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