Arc heater ballast resistor fireproofing fixture

Abstract

The application provides an arc heater ballast resistor fireproof fixing device. The arc heater ballast resistor fireproof fixing device comprises a metal frame and a ceramic fixing assembly for fixing the ballast resistor on the metal frame, the ceramic fixing assembly comprises a first ceramic fixing piece, a second ceramic fixing piece and a ceramic buckle, the ballast resistor has a bending part and a connecting part connected with the bending part, the metal frame has a hollow part corresponding to the bending part, the first ceramic fixing piece is fixed in the hollow part of the metal frame, the second ceramic fixing piece is fixed on the metal frame, and the bending part and the connecting part of the ballast resistor are fixed on the first ceramic fixing piece and the second ceramic fixing piece through the ceramic buckle respectively. The arc heater ballast resistor fireproof fixing device solves the fire risk caused by the sharp rise of the surface temperature of the ballast resistor under the abnormal condition of large current or cooling water supply, and has the advantages of simple structure, light weight and high reliability.

Description

Technical Field

[0001] This invention relates to the field of arc heater technology, and in particular to a fireproof fixing device for the stabilizing resistor of an arc heater. Background Technology

[0002] An arc heater is a device that heats gas using a plasma arc. It boasts high heating efficiency, capable of heating gases of various media to thousands or even tens of thousands of Kelvin. It is widely used in ground-based testing of thermal protection materials or structures for hypersonic vehicles. The operation of an arc heater requires complex voltage regulation and rectification of the power supply. First, a 10kV high-voltage AC power supply is sent from the high-voltage distribution system to a voltage regulating transformer. The transformer's tap is set according to the rectified output open-circuit voltage, and the power is then sent through a high-voltage switchgear to a choke-type saturated reactor and a rectifier transformer.

[0003] The rectifier unit consists of a diode-based rectifier circuit, with a choke-type saturated reactor controlling its DC voltage output and providing constant current characteristics. Rectifier units can be connected in series and parallel to meet different output voltage and current requirements. After rectification by the silicon rectifier, voltage regulation and constant current are achieved by changing the absorption voltage of the choke-type saturated reactor connected in series with the primary side of the rectifier transformer. The voltage absorbed by the saturated reactor can be controlled by the excitation current. The time constant of the power supply voltage change must keep pace with the time constant of the arc voltage change; otherwise, the arc heater will not operate stably. To meet the matching requirements between the power supply characteristics and the arc heater characteristics, a high-power stainless steel tube water-cooled stabilizing resistor is typically connected in series in the main power supply circuit.

[0004] Arc heaters typically use dozens of stainless steel tubes connected in series, with each tube reaching 4-5 meters in length. Therefore, the stabilizing resistor system occupies a significant amount of space. When the current reaches 4000A or higher, or if the cooling water supply pipes are partially or completely blocked, the stabilizing resistor will rapidly heat up within a very short time, eventually burning through the stainless steel tubes. Furthermore, the high temperature can also cause other non-metallic components of the equipment to ignite. All of these situations have extremely adverse effects on the progress of the experiment and the safety of the related equipment.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a fireproof fixing device for the stabilizing resistor of an electric arc heater. This device overcomes the problems of existing stabilizing resistor structures having large space requirements and being prone to fire due to temperature runaway under certain conditions.

[0007] This invention provides a fireproof fixing device for an arc heater stabilizing resistor, comprising a metal frame and a ceramic fixing assembly for fixing the stabilizing resistor to the metal frame. The ceramic fixing assembly includes a first ceramic fixing member, a second ceramic fixing member, and a ceramic clip. The stabilizing resistor has a bent portion and a connecting portion connected to the bent portion. The metal frame has a hollow portion corresponding to the bent portion. The first ceramic fixing member is fixed to the hollow portion of the metal frame, and the second ceramic fixing member is fixed to the metal frame. The bent portion and the connecting portion of the stabilizing resistor are respectively fixed to the first ceramic fixing member and the second ceramic fixing member by ceramic clips.

[0008] Furthermore, the metal frame is welded from square steel, with a wall thickness ≥5mm and a side length of 50-100mm.

[0009] Furthermore, the stabilizing resistor is an M-shaped stabilizing resistor, which has two bends, and the metal frame has two hollow parts corresponding to the two bends of the M-shaped stabilizing resistor.

[0010] Furthermore, two or more first ceramic fasteners are provided in the hollow part of the metal frame, and the two or more first ceramic fasteners are arranged in parallel and spaced apart.

[0011] Furthermore, the first ceramic fastener is an I-shaped ceramic plate, with both ends of the I-shaped ceramic plate fixed to the hollow part of the metal frame by countersunk screws.

[0012] Furthermore, the second ceramic fastener is a T-shaped ceramic plate, with both ends of the T-shaped ceramic plate fixed to the metal frame by countersunk screws.

[0013] Furthermore, a U-shaped groove is provided on one side of the ceramic clip, and the stabilizing resistor is fixed in the U-shaped groove of the ceramic clip. The ceramic clip is fixed to the first ceramic fastener and the second ceramic fastener by countersunk screws.

[0014] Furthermore, the spacing between adjacent resistor segments of the stabilizing resistor is 100-300mm.

[0015] Furthermore, the minimum distance between the stabilizing resistor and the metal frame is ≥30mm.

[0016] Furthermore, a gap of 0.05-0.5mm is provided between the ceramic clip and the stabilizing resistor.

[0017] The fireproof fixing device for the arc heater stabilizing resistor of the present invention significantly reduces the space occupied by the stabilizing resistor by setting a bending part on the stabilizing resistor; by setting a hollow part on the metal frame corresponding to the bending part, and fixing the stabilizing resistor to the metal frame by a ceramic fixing component, the entire fixing device achieves fireproofing and insulation under high temperature conditions, ensuring the non-flammability of the fixing device under extreme conditions, and solving the fire risk caused by the rapid increase in surface temperature of the stabilizing resistor under high current or abnormal cooling water supply conditions; the above-mentioned fireproof fixing device for the arc heater stabilizing resistor is connected by countersunk screws, which is convenient for disassembly and assembly, and has the advantages of simple structure, light weight and high reliability, which greatly improves the testing efficiency and equipment safety. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the fireproof fixing device for the stabilizing resistor of an arc heater according to one embodiment;

[0020] Figure 2 A front view of an I-shaped ceramic plate according to one embodiment;

[0021] Figure 3 Left view of an I-shaped ceramic plate according to one embodiment;

[0022] Figure 4 This is a front view of a T-shaped ceramic plate according to one embodiment;

[0023] Figure 5 A bottom view of a T-shaped ceramic plate according to one embodiment;

[0024] Figure 6 This is a front view of a ceramic clip according to one embodiment;

[0025] Figure 7 This is a top view of one embodiment of the ceramic clip.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1: Metal frame; 2: Stabilizing resistor; 3: I-shaped ceramic plate; 4: T-shaped ceramic plate; 5: Ceramic buckle. Detailed Implementation

[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form includes the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this description, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] Combination Figures 1 to 7 As shown, the fireproof fixing device for the arc heater stabilizing resistor in this embodiment includes a metal frame 1 and a ceramic fixing assembly for fixing the stabilizing resistor 2 to the metal frame 1. The ceramic fixing assembly includes a first ceramic fixing member, a second ceramic fixing member, and a ceramic buckle 5. The stabilizing resistor 2 has a bent portion and a connecting portion connected to the bent portion. The metal frame 1 has a hollow portion corresponding to the bent portion. The first ceramic fixing member is fixed to the hollow portion of the metal frame 1, and the second ceramic fixing member is fixed to the metal frame 1. The bent portion and the connecting portion of the stabilizing resistor 2 are respectively fixed to the first ceramic fixing member and the second ceramic fixing member by the ceramic buckle 5.

[0033] The metal frame 1 is mainly used for installing and fixing the stabilizing resistor 2, and its structure is not strictly limited. Specifically, the metal frame 1 can be welded from square steel, preferably with a wall thickness ≥5mm and a side length of 50-100mm. The material can be 304 stainless steel, Q235 carbon steel, etc., preferably 304 stainless steel. The middle part of the metal frame 1 has a hollow part corresponding to the bent part of the stabilizing resistor 2. When the stabilizing resistor 2 is fixed on the metal frame 1, the main body of the stabilizing resistor 2 is located in the hollow part of the metal frame 1, and there is a certain distance between the stabilizing resistor 2 and the metal frame 1. The minimum distance between the stabilizing resistor 2 and the metal frame 1 is ≥30mm.

[0034] The stabilizing resistor 2 has a bent portion and a connecting portion connected to the bent portion. It is understood that the connecting portion is typically located between two adjacent bent portions or at the end of a bent portion. Furthermore, the connecting portion located at the end of a bent portion can also be used to connect two adjacent stabilizing resistors 2. The bent portion of the stabilizing resistor 2 significantly reduces its space requirement. There are no strict limitations on the shape of the stabilizing resistor 2 or the number of bent portions; they can be reasonably set according to actual needs.

[0035] like Figure 1 As shown, in one embodiment, the stabilizing resistor 2 is an M-shaped stabilizing resistor, that is, the shape of the stabilizing resistor 2 is M-shaped. It can be understood that the M-shaped stabilizing resistor has two bent portions, and the metal frame 1 has two hollow portions corresponding to the two bent portions of the M-shaped stabilizing resistor. In particular, the spacing between adjacent resistor segments of the stabilizing resistor 2 can be set to 100-300 mm; the material of the stabilizing resistor 2 is not strictly limited, for example, polished 304 stainless steel can be used. By processing the stabilizing resistor 2 into an M-shape, the space occupied by the stabilizing resistor 2 is reduced to about 20% of the original straight shape.

[0036] The stabilizing resistor 2 is mainly fixed to the metal frame 1 by a first ceramic fastener, a second ceramic fastener, and a ceramic clip 5. The number and position of the first ceramic fastener, the second ceramic fastener, and the ceramic clip 5 are not strictly limited, as long as they can effectively fix the stabilizing resistor 2 to the metal frame 1. Specifically, two or more first ceramic fasteners can be installed in the hollow portion of the metal frame 1, arranged parallel and spaced apart. Simultaneously, second ceramic fasteners are installed at the connection points between the bent portions of the stabilizing resistor 2 and at the connection points at the ends of the bent portions, thereby providing a stable fixation for the stabilizing resistor 2. Furthermore, it can be understood that the ceramic clip 5 can be positioned at the contact points between the stabilizing resistor 2 and the first and second ceramic fasteners.

[0037] like Figure 2 , Figure 3 As shown, in one embodiment, the first ceramic fastener is an I-shaped ceramic plate 3, with both ends of the I-shaped ceramic plate 3 fixed to the hollow portion of the metal frame 1 by countersunk screws. More specifically, both ends of the I-shaped ceramic plate 3 can be fixed to two opposing inner walls of the hollow portion of the metal frame 1. It is understood that threaded holes for connecting with the metal frame 1 and the ceramic clip 5 can be provided at suitable positions on the I-shaped ceramic plate 3.

[0038] like Figure 4 , Figure 5As shown, in one embodiment, the second ceramic fastener is a T-shaped ceramic plate 4, with both ends of the T-shaped ceramic plate 4 fixed to the metal frame 1 by countersunk screws. It is understood that the metal frame 1, the first ceramic fastener, and the second ceramic fastener are essentially located on the same horizontal plane. There are no strict limitations on the fixing method of the T-shaped ceramic plate; it can be fixed to the metal frame 1 in a suitable manner. For example, the two ends of the T-shaped ceramic plate 4 can be installed on the side wall of the metal frame 1. In this case, the position on the metal frame 1 for installing the T-shaped ceramic plate 4 can be machined into an L-shape to facilitate the installation of the T-shaped ceramic plate 4. In this case, the first ceramic fastener and the second ceramic fastener are installed on the inner and outer sides of the same side of the square steel. It is understood that the second ceramic fastener and the first ceramic fastener are staggered. Furthermore, threaded holes for connecting with the metal frame 1 and the ceramic clip 5 can be provided at suitable positions on the T-shaped ceramic plate 4.

[0039] The materials of the first and second ceramic fasteners are not strictly limited; for example, 99% pure alumina or silicon nitride can be used. The aforementioned fastening device uses a metal frame 1 made of high-temperature resistant stainless steel or similar materials and ceramic fastening components made of alumina or similar materials. Through the insulating and high-temperature resistant ceramic fastening components and metal frame 1, the entire fastening device achieves fire resistance and insulation under high-temperature conditions, improving its fire resistance reliability and ensuring its non-flammability under extreme circumstances.

[0040] like Figure 6 , Figure 7 As shown, in one embodiment, a U-shaped groove is provided on one side of the ceramic clip 5, and the stabilizing resistor 2 is fixed in the U-shaped groove of the ceramic clip 5. The ceramic clip 5 is fixed to the first ceramic fastener and the second ceramic fastener by countersunk screws. In particular, a gap of 0.05-0.5mm is provided between the ceramic clip 5 and the stabilizing resistor 2. In addition, threaded holes for connecting with the first ceramic fastener and the second ceramic fastener can be provided on the ceramic clip 5. The above-mentioned fixing device has a simple structure, requiring only a small number of I-shaped ceramic plates 3, T-shaped ceramic plates 4 and ceramic clips 5, and is connected to the metal frame 1 by countersunk screws, making it easy to assemble and disassemble.

[0041] The fireproof fixing device for the arc heater stabilizing resistor in this embodiment significantly reduces the space occupied by the stabilizing resistor 2 by setting a bending part on the stabilizing resistor 2; by setting a hollow part on the metal frame 1 corresponding to the bending part, and fixing the stabilizing resistor 2 to the metal frame 1 by a ceramic fixing component, the entire fixing device achieves fireproofing and insulation under high temperature conditions, ensuring the non-flammability of the fixing device under extreme conditions, and solving the fire risk caused by the rapid increase in surface temperature of the stabilizing resistor 2 under high current or abnormal cooling water supply conditions; the above-mentioned fireproof fixing device for the arc heater stabilizing resistor is connected by countersunk screws, which is convenient for disassembly and assembly, and has the advantages of simple structure, light weight and high reliability, which greatly improves the test efficiency and equipment safety.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fireproof fixing device for the stabilizing resistor of an electric arc heater, characterized in that, The device includes a metal frame and a ceramic fixing assembly for fixing a stabilizing resistor to the metal frame. The ceramic fixing assembly includes a first ceramic fastener, a second ceramic fastener, and a ceramic clip. The stabilizing resistor has a bent portion and a connecting portion connected to the bent portion. The metal frame has a hollow portion corresponding to the bent portion. When the stabilizing resistor is fixed to the metal frame, the main body of the stabilizing resistor is located in the hollow portion of the metal frame. The first ceramic fastener is fixed to the hollow portion of the metal frame, and the second ceramic fastener is fixed to the metal frame. The bent portion and connecting portion of the stabilizing resistor... The first ceramic fastener is fixed to the first ceramic fastener and the second ceramic fastener respectively by ceramic clips. The first ceramic fastener is an I-shaped ceramic plate, and both ends of the I-shaped ceramic plate are fixed to the hollow part of the metal frame by countersunk screws. The second ceramic fastener is a T-shaped ceramic plate, and both ends of the T-shaped ceramic plate are fixed to the metal frame by countersunk screws. The metal frame is made of 304 stainless steel or Q235 carbon steel. The first ceramic fastener and the second ceramic fastener are made of alumina or silicon nitride. The spacing between adjacent resistor segments of the stabilizing resistor is 100-300 mm. The minimum distance between the stabilizing resistor and the metal frame is ≥30 mm. A gap of 0.05-0.5 mm is provided between the ceramic clips and the stabilizing resistor.

2. The fireproof fixing device for the arc heater stabilizing resistor according to claim 1, characterized in that, The metal frame is welded from square steel bars with a wall thickness of ≥5 mm and a side length of 50-100 mm.

3. The fireproof fixing device for the arc heater stabilizing resistor according to claim 1, characterized in that, The stabilizing resistor is an M-shaped stabilizing resistor, which has two bends, and the metal frame has two hollow parts corresponding to the two bends of the M-shaped stabilizing resistor.

4. The fireproof fixing device for the arc heater stabilizing resistor according to claim 1, characterized in that, Two or more first ceramic fasteners are provided in the hollow part of the metal frame, and the two or more first ceramic fasteners are arranged in parallel and spaced apart.

5. The fireproof fixing device for the arc heater stabilizing resistor according to claim 1, characterized in that, A U-shaped groove is provided on one side of the ceramic clip, and the stabilizing resistor is fixed in the U-shaped groove of the ceramic clip. The ceramic clip is fixed to the first ceramic fastener and the second ceramic fastener by countersunk screws.

Images