A fireproof fixing device for arc heater ballast resistance

Abstract

A kind of arc heater ballast resistance fireproof fixing device is composed of metal frame, M-shaped ballast resistance, I-shaped ceramic plate, T-shaped ceramic plate and ceramic buckle, etc., I-shaped ceramic plate and T-shaped ceramic plate are fixed on metal frame by countersunk screw, M-shaped ballast resistance is placed on I-shaped ceramic plate and T-shaped ceramic plate, and is fixed by ceramic buckle.The purpose of fire prevention and insulation of the whole device under high temperature condition is realized by insulating high-temperature ceramic assembly and metal frame.The use of the present application solves the fire risk caused by the sharp rise of surface temperature of ballast resistance under the condition of large current or abnormal cooling water supply, has the advantages of simple structure, light weight and high reliability, etc., greatly improves the test efficiency and equipment safety.

Description

Technical Field

[0001] This invention relates 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 extremely 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 10 kV 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 no-load voltage, and the power is then sent to a choke-type saturated reactor and a rectifier transformer via a high-voltage switchgear. The rectifier unit consists of diodes forming the rectifier circuit, and the choke-type saturated reactor controls its DC voltage output, providing constant current characteristics. Rectifier units can be connected in series and parallel to meet different output voltage and current parameters. After rectification by the silicon rectifier, the voltage absorbed by the choke-type saturated reactor, connected in series with the primary side of the rectifier transformer, is adjusted to achieve voltage regulation and constant current. 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 up with the time constant of the arc voltage change; otherwise, the arc heater will not be able to 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 usually connected in series in the main power supply circuit.

[0003] 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 when 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 factors have extremely adverse effects on the progress of the experiment and the safety of the related equipment. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a fireproof fixing device for the stabilizing resistor of an arc heater, which solves the problems of large space occupation and easy fire caused by temperature runaway under certain conditions in the existing stabilizing resistor structure.

[0005] The technical solution of the present invention is: a fireproof fixing device for the stabilizing resistor of an arc heater, comprising a metal frame, an M-shaped stabilizing resistor, an I-shaped ceramic plate, a T-shaped ceramic plate, and a ceramic buckle; The two ends of the I-shaped ceramic plate are fixed to the metal frame by countersunk bolts and nuts; The T-shaped ceramic plate is fixed to the metal frame by countersunk bolts and nuts; The M-shaped stabilizing resistor is placed on the I-shaped ceramic plate and the T-shaped ceramic plate; The ceramic clips are used to secure the M-shaped stabilizing resistor using countersunk bolts and nuts.

[0006] Furthermore, the metal frame is welded using square steel with a wall thickness of 5mm or more and a side length between 50 and 100mm, and the preferred material is 304 stainless steel.

[0007] Furthermore, the spacing between the M-shaped stabilizing resistors is between 100-300mm, and the material used is polished 304 stainless steel.

[0008] Furthermore, the materials used for the I-shaped ceramic plate, T-shaped ceramic plate, and ceramic buckle are 99% pure alumina or silicon nitride.

[0009] Furthermore, the minimum distance between the M-shaped stabilizing resistor and the metal frame is not less than 30 mm.

[0010] Furthermore, the gap between the ceramic clip and the M-shaped stabilizing resistor is between 0.05 and 0.5 mm.

[0011] Furthermore, the total length of the M-shaped stabilizing resistor is between 2.0 and 20.0 mm.

[0012] Furthermore, the ratio of the vertical length to the horizontal length of the metal frame is between 1.4 and 2.0.

[0013] Furthermore, the ratio of the length of the M-shaped stabilizing resistor to the length of the metal frame in the vertical direction is between 0.7 and 0.9.

[0014] Furthermore, the distance between the inlet and outlet of the M-shaped stabilizing resistor and the nearest T-shaped ceramic plate is between 200 and 300 mm.

[0015] The advantages of this invention compared to the prior art are: (1) The present invention occupies little space. By processing the straight stainless steel tube into an M shape, the space occupied by the stabilizing resistor is reduced to about 20% of the original.

[0016] (2) The present invention has high fire resistance reliability. The entire stabilizing resistor fixing device uses high temperature resistant stainless steel and alumina ceramic materials to ensure the non-flammability of the device under extreme conditions.

[0017] (3) The present invention has a simple structure. The entire fixing device only requires a small number of ceramic plates and metal frames to be connected by countersunk screws, making it easy to assemble and disassemble. Attached Figure Description

[0018] Figure 1 This is a structural diagram of an I-shaped ceramic plate.

[0019] Figure 2 This is a structural diagram of a T-shaped ceramic plate.

[0020] Figure 3 This is a diagram of the ceramic snap-fit ​​structure.

[0021] Figure 4 This is a schematic diagram of the specific structure of the present invention. Detailed Implementation

[0022] To better understand the above technical solutions, the technical solutions of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0023] The following description, in conjunction with the accompanying drawings, provides a more detailed account of a fireproof fixing device for an arc heater's stabilizing resistor, as provided in the embodiments of this application. Specific implementation methods may include (e.g.) Figures 1-4 As shown): It mainly consists of ceramic components, a stabilizing resistor, and a metal frame. It includes a metal frame, an M-shaped stabilizing resistor, an I-shaped ceramic plate, a T-shaped ceramic plate, and ceramic clips. The two ends of the I-shaped ceramic plate are fixed to the metal frame with countersunk bolts and nuts. The T-shaped ceramic plate is also fixed to the metal frame with countersunk bolts and nuts. The M-shaped stabilizing resistor is placed on top of the I-shaped and T-shaped ceramic plates. The ceramic clips secure the M-shaped stabilizing resistor with countersunk bolts and nuts.

[0024] The fireproof fixing device for the stabilizing resistor of the electric arc heater is preferably made of square steel with a wall thickness of 5mm or more and a side length of 50-100mm for welding. The preferred materials are 304 stainless steel and Q235 carbon steel.

[0025] The aforementioned arc heater stabilizing resistor fireproof fixing device has an M-shaped stabilizing resistor spacing between 100-300mm, and its material is preferably polished 304 stainless steel.

[0026] The fireproof fixing device for the stabilizing resistor of the electric arc heater is preferably made of 99% pure alumina or silicon nitride, using I-shaped ceramic plates, T-shaped ceramic plates and ceramic clips.

[0027] The minimum distance between the M-shaped stabilizing resistor and the metal frame in the aforementioned arc heater stabilizing resistor fireproof fixing device should be greater than or equal to 30mm.

[0028] In the aforementioned fireproof fixing device for the stabilizing resistor of an electric arc heater, the gap between all ceramic clips and the M-shaped stabilizing resistor 2 should be between 0.05 and 0.5 mm.

[0029] In the solutions provided in the embodiments of this application, such as Figure 4 As shown, the present invention mainly consists of a metal frame 1, an M-shaped stabilizing resistor 2, an I-shaped ceramic plate 3, a T-shaped ceramic plate 4, and a ceramic clip 5. The two ends of the I-shaped ceramic plate 3 are fixed to the metal frame 1 by M8 countersunk bolts and nuts. The T-shaped ceramic plate 4 is fixed to the metal frame 1 by M8 countersunk bolts and nuts. The M-shaped stabilizing resistor 2 is placed on the I-shaped ceramic plate 3 and the T-shaped ceramic plate 4. The ceramic clip 5 uses M8 countersunk bolts and nuts to fix the M-shaped stabilizing resistor 2.

[0030] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0031] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A fireproof fixing device for the stabilizing resistor of an electric arc heater, characterized in that, It includes a metal frame (1), an M-shaped stabilizing resistor (2), an I-shaped ceramic plate (3), a T-shaped ceramic plate (4), and a ceramic buckle (5); The two ends of the I-shaped ceramic plate (3) are fixed to the metal frame (1) by countersunk bolts and nuts; The T-shaped ceramic plate (4) is fixed to the metal frame (1) by countersunk bolts and nuts; The M-shaped stabilizing resistor (2) is placed on the I-shaped ceramic plate (3) and the T-shaped ceramic plate (4); The ceramic buckle (5) is used to fix the M-shaped stabilizing resistor (2) with countersunk bolts and nuts; The minimum distance between the M-shaped stabilizing resistor (2) and the metal frame (1) shall not be less than 30 mm; The gap between the ceramic buckle (5) and the M-shaped stabilizing resistor (2) is between 0.05 and 0.5 mm; The ratio of the vertical length to the horizontal length of the metal frame (1) is between 1.4 and 2.0; The length ratio of the M-shaped stabilizing resistor (2) to the metal frame (1) in the vertical direction is between 0.7 and 0.

9.

2. The fireproof fixing device for the stabilizing resistor of an arc heater according to claim 1, characterized in that, The metal frame (1) is welded using square steel with a wall thickness greater than or equal to 5 mm and a side length between 50 and 100 mm, and the preferred material is 304 stainless steel.

3. The fireproof fixing device for the stabilizing resistor of an arc heater according to claim 1, characterized in that, The spacing of the M-shaped stabilizing resistors (2) is between 100-300mm, and the material is polished 304 stainless steel.

4. A fireproof fixing device for the stabilizing resistor of an arc heater according to claim 1, characterized in that, The materials used for the I-shaped ceramic plate (3), T-shaped ceramic plate (4) and ceramic buckle (5) are 99% pure alumina or silicon nitride.

5. A fireproof fixing device for the stabilizing resistor of an arc heater according to claim 1, characterized in that, The total length of the M-shaped stabilizing resistor (2) is between 2.0 and 20.0 mm.

6. A fireproof fixing device for the stabilizing resistor of an arc heater according to claim 1, characterized in that, The distance between the inlet and outlet of the M-shaped stabilizing resistor (2) and the nearest T-shaped ceramic plate (4) is between 200 and 300 mm.

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