An arc root operation status monitoring device

Abstract

This invention discloses a device for monitoring the operating status of an electric arc root, comprising a positive electrode plate, a swirling chamber, a negative electrode plate, a heat flow meter, and an observation window. The positive electrode plate is circular, with the positive arc root attached to its rotating track. The swirling chamber is cylindrical, primarily used to introduce rotating airflow to compress the arc column. The negative electrode plate is annular, with the negative arc root attached to its rotating track, and hot airflow exiting from the central throat of the negative electrode plate. The heat flow meter is cylindrical, used to measure the heat flux density at the arc root. The observation window is cylindrical, used to observe the arc root's operating speed and morphology. The positive and negative electrode plates are respectively sealed to the swirling chamber, the heat flow meter is sealed to the rotating tracks of the positive and negative electrode plates, and the observation window is sealed to the swirling chamber. This invention can be applied to the field of aerodynamic thermal ground simulation experimental equipment, primarily for monitoring the operating status of the electric arc root.

Description

Technical Field

[0001] This invention relates to an arc root operation status monitoring device, belonging to the technical field of aerodynamic thermal ground simulation equipment. Background Technology

[0002] With the development of aerothermal ground simulation technology and special metal smelting technology, various types of electric arc heaters have been developed. Research on the operating characteristics of electric arcs has attracted the attention of industry professionals. An electric arc includes the positive arc root, arc column, and negative arc root. The characteristics of the arc root include its operating mechanism, heat flow at the arc root, arc root morphology, arc root movement law, arc root movement speed, and environmental factors affecting these characteristics. Traditional electric arc heaters use cylindrical electrodes, with the arc root rotating on the inner surface of the electrode. The cylindrical inner surface is not conducive to monitoring the arc root's trajectory with external measuring equipment. Traditional electric arc heaters also use magnetic field coils at the electrodes, and the magnetic field generated by these coils causes electromagnetic interference to external measuring equipment. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art and provide an arc root operation status monitoring device that forces the arc root to rotate on the rotating track of the flat electrode, which facilitates the measurement and monitoring of the arc root operation, eliminates the magnetic field coil, and eliminates electromagnetic interference from the magnetic field to external measuring equipment.

[0004] The above-mentioned objective of the present invention is achieved through the following technical solution:

[0005] This invention discloses an arc root operation status monitoring device, comprising a positive electrode plate, a swirling chamber, a negative electrode plate, a heat flow meter, an observation window, and a sensor; wherein,

[0006] A positive electrode plate is provided with a first rotating track. The root of the positive electrode arc moves along the first rotating track. A heat flow meter mounting hole is provided on the first rotating track, and a sensor is installed on the outside.

[0007] The cyclone chamber is connected to the positive electrode plate at one end and the negative electrode plate at the other end; it provides rotating airflow and cold air film compression arc column, and an observation window is set on the outside of the cyclone chamber.

[0008] The negative electrode plate is equipped with a second rotating track. The arc root of the negative electrode moves along the second rotating track. The second rotating track is equipped with a heat flow meter mounting hole, and the sensor is installed on the outer side. A throat is set in the center, and hot gas is ejected from the throat.

[0009] Several heat flux meters are installed on the positive and negative plates respectively, in contact with the arc root, to measure the heat flux density at the arc root;

[0010] The observation window, used in conjunction with a high-speed camera, allows observation of the arc root's running speed and shape.

[0011] The sensor, insulated from the arc root, measures the speed at which the arc root moves.

[0012] Furthermore, in the above-mentioned device, the positive electrode plate is circular and adopts a water-cooled jet structure; the first rotating track is annular, with the inner and outer sides of the annulus being insulating and heat-insulating zones. The insulating and heat-insulating zones are treated with insulation and heat insulation, and pressure measuring holes are provided on the inner side of the annulus to monitor the airflow pressure near the arc root.

[0013] Furthermore, in the above-mentioned device, the cyclone chamber is a cylindrical structure with a water-cooled structure. It has air inlet rings at both ends to introduce supersonic rotating airflow. Several air inlet holes are provided on the cylindrical wall of the cyclone chamber to introduce rotating airflow to form a cold air film.

[0014] Furthermore, in the above-mentioned device, the negative electrode plate adopts a water-cooled jet structure; the second rotating track is circular; the inner and outer sides of the ring are both insulating and heat-insulating areas; the insulating and heat-insulating areas are treated with insulation and heat insulation, and multiple pressure measuring holes are set in the inner insulating and heat-insulating area to monitor the airflow pressure near the arc root; a throat is set in the central area of ​​the inner insulating and heat-insulating area to form a supersonic flow field.

[0015] Furthermore, in the above-mentioned device, the center diameters of the first and second rotating tracks are equal, and are 10 to 15 mm smaller than the inner diameter of the cyclone chamber.

[0016] Furthermore, in the above-mentioned device, electrical insulation is provided between the positive electrode plate and the cyclone chamber, and between the cyclone chamber and the negative electrode plate, with an insulation resistance value of not less than 2kΩ.

[0017] Furthermore, in the above-mentioned device, the air intake ring is provided with a plurality of air intake holes, and the air intake holes of the plurality of air intake rings are connected along their axes to form a regular polygon; the air intake holes provided on the cylinder wall of the cyclone chamber are connected along their axes to form a regular polygon.

[0018] Furthermore, in the above-mentioned device, the heat flow meter has a response time of less than 10ms and a sampling frequency of greater than 100kHz.

[0019] Furthermore, in the above-mentioned device, the glass of the observation window is physically isolated from the hot air flow by a cold air film disposed on the glass surface.

[0020] Furthermore, in the above-mentioned device, the sensor response time is less than 10ms and the acquisition frequency is greater than 100kHz.

[0021] The advantages of this invention compared to the prior art are as follows:

[0022] (1) The present invention uses a circular plate-shaped positive electrode plate and is equipped with a rotating track, which makes it easy to observe the movement state of the positive electrode arc root and facilitates subsequent measurement of the positive electrode arc spot size;

[0023] (2) The present invention uses a circular negative electrode plate and is equipped with a rotating track, which makes it easy to observe the movement state of the negative electrode arc root and facilitates subsequent measurement of the negative electrode arc spot size.

[0024] (3) The present invention relies on the swirling air in the swirling chamber to drive the arc root to rotate, eliminating the magnetic field coil and eliminating the electromagnetic interference generated by the magnetic field on external measuring equipment.

[0025] (4) The present invention uses a fast response heat flow meter combined with a high frequency acquisition device to monitor the wall heat flow at the arc root;

[0026] (5) The present invention uses a heat-insulated observation window combined with a high-speed camera to monitor the movement speed and morphology of the arc root;

[0027] (6) The present invention uses a fast response sensor combined with a high frequency acquisition device to monitor the moving speed of the arc root;

[0028] (7) The arc root operation status monitoring device used in this invention can be used to monitor the influence of various input conditions of the arc heater on the arc root operation status. Attached Figure Description

[0029] Figure 1 This is a structural diagram of an arc root operation status monitoring device according to the present invention;

[0030] Figure 2 This is a schematic diagram of the positive electrode plate layout of the present invention;

[0031] Figure 3 This is a structural diagram of the cyclone chamber of the present invention;

[0032] Figure 4 This is a schematic diagram of the cross-sectional distribution of the air inlet holes in this invention;

[0033] Figure 5 This is a schematic diagram of the negative electrode plate layout of the present invention. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0035] This invention discloses an arc root operation status monitoring device, comprising a positive electrode plate 1, a cyclone chamber 2, a negative electrode plate 3, a heat flow meter 4, an observation window 5, and a sensor 6; wherein,

[0036] Positive plate 1, with a first rotating track, the positive arc root moves along the first rotating track, the first rotating track is provided with a heat flow meter 4 mounting hole, and a sensor 6 is installed on the outside;

[0037] Cyclone chamber 2 is connected to positive electrode plate 1 at one end and negative electrode plate 3 at the other end; it provides rotating airflow and cold air film compression arc column, and observation window 5 is provided on the outside of cyclone chamber 2;

[0038] The negative electrode plate 3 is provided with a second rotating track. The arc root of the negative electrode moves along the second rotating track. The second rotating track is provided with a heat flow meter 4 mounting hole and a sensor 6 is installed on the outside. A throat 14 is provided in the center and hot air is ejected from the throat 14.

[0039] Several heat flux meters 4 are installed on the positive plate 1 and the negative plate 3 respectively, and are in contact with the arc root to measure the heat flux density at the arc root.

[0040] Observation window 5, used in conjunction with a high-speed camera, is used to observe the running speed and shape of the arc root;

[0041] Sensor 6, insulated from the arc root, measures the moving speed of the arc root.

[0042] Preferably, the positive electrode plate 1 is circular and adopts a jet water cooling structure; the first rotating track is annular, with the inner and outer sides of the annulus being insulating and heat-insulating areas, and the insulating and heat-insulating areas are treated with insulation and heat insulation. A pressure measuring hole is set on the inner side of the annulus to monitor the airflow pressure near the arc root.

[0043] Preferably, the cyclone chamber 2 has a cylindrical structure and a water-cooled structure. It has air inlet rings at both ends to introduce supersonic rotating airflow. Several air inlet holes are provided on the cylindrical wall of the cyclone chamber to introduce rotating airflow and form a cold air film.

[0044] Preferably, the negative electrode plate 3 adopts a jet water-cooling structure; the second rotating track 7 is circular; the inner and outer sides of the ring are both insulating and heat-insulating areas; the insulating and heat-insulating areas are treated with insulation and heat insulation, and multiple pressure measuring holes 9 are set in the inner insulating and heat-insulating area to monitor the airflow pressure near the arc root; a throat 14 is set in the central area of ​​the inner insulating and heat-insulating area to form a supersonic flow field.

[0045] Preferably, the center diameters of the first and second rotating tracks are equal, and are 10-15 mm smaller than the inner diameter of the cyclone chamber 2.

[0046] Preferably, the positive electrode plate 1 and the cyclone chamber 2, and the cyclone chamber 2 and the negative electrode plate 3 are electrically insulated, and the insulation resistance is not less than 2kΩ.

[0047] Preferably, the air intake ring is provided with a number of air intake holes, and the air intake holes of the several air intake rings are connected on the axis and distributed in a regular polygon; the air intake holes provided on the cylinder wall of the cyclone chamber 2 are connected on the axis and distributed in a regular polygon.

[0048] Preferably, the heat flow meter 4 has a response time of less than 10ms and a sampling frequency of greater than 100kHz.

[0049] Preferably, the glass of the observation window 5 is physically isolated from the hot airflow through a cold air film set on the glass surface.

[0050] Preferably, the sensor 6 has a response time of less than 10ms and a sampling frequency of greater than 100kHz.

[0051] Example

[0052] Depend on Figure 1 It is known that an arc root operation status monitoring device includes a positive electrode plate 1, a cyclone chamber 2, a negative electrode plate 3, a heat flow meter 4, an observation window 5, and a sensor 6, with adjacent components connected in a sealed manner.

[0053] Among them, the positive electrode plate 1 provides a positive electrode arc root rotation track, the positive electrode arc root moves along the rotation track, the heat flow meter 4 mounting hole is provided on the rotation track, and the sensor 6 is provided on the outside of the positive electrode plate 1.

[0054] The cyclone chamber 2 provides rotating airflow and cold air film compression arc column. The observation window 5 is set on the cyclone chamber 2. The observation window is tilted to ensure that the high-speed camera can observe the arc root.

[0055] The negative electrode plate 3 provides a negative electrode arc root rotation track, the negative electrode arc root moves along the rotation track, the heat flow meter 4 mounting hole is provided on the rotation track, the sensor 6 is provided on the outer side of the negative electrode plate 3, and the throat is provided in the central area of ​​the negative electrode plate 3, and the hot air flow is ejected from the throat.

[0056] Heat flow meter 4 is in direct contact with the arc root to measure the heat flux density at the arc root;

[0057] Observation window 5 is used in conjunction with a high-speed camera to observe the running speed and shape of the arc root;

[0058] Sensor 6 is insulated from the arc root and measures the movement speed of the arc root.

[0059] Depend on Figure 2 It is known that the rotating track 7 of the positive plate 1 of the arc root operation status monitoring device is annular, with the central diameter of the ring being 10mm smaller than the inner diameter of the cyclone chamber 2, and the ring width being 2mm. Two Φ2mm holes 8 are symmetrically arranged on the rotating track for installing heat flow meters 4. The area outside the rotating track is coated with insulating and heat-insulating material with an insulation resistance of 1MΩ, and the coating does not peel off under alternating action of 1000℃ and 0℃. Pressure measuring holes 9 with a diameter of 1mm are set in the coated area. The function of these devices is to confine the arc root on the rotating track, drive the arc root to rotate along the rotating track by the cyclone airflow, and measure the wall heat flow and surface pressure at the arc root position in real time. After the test, the influence of current, gas flow rate, arc chamber total pressure, and other conditions on the arc root rotation effect can be analyzed based on the collected data.

[0060] Depend on Figure 3It is known that the cyclone chamber of an arc root operation status monitoring device consists of an inlet ring 10 and a straight section 11. Two windows 12 are provided on the straight section, with the extended lines of the windows aligned with the rotating track. The inlet ring has two rows of eight inlet holes, through which upstream pressure controls the airflow to enter the cyclone chamber at supersonic speed, serving as the main working medium. The straight section has nine rows of eight inlet holes 13, through which pressure controls the airflow to enter the cyclone chamber at subsonic speed, forming a cold air film. The arrangement of each row of inlet holes is as follows: Figure 4 As shown, the airflow direction forms a regular octagon. The airflow introduced by each air inlet flows along the edge of the regular octagon and just reaches the outlet of the adjacent downstream air inlet, forming a closed airflow. This provides a good compression effect on the arc column and protects the inner surface of the straight section from being burned by the hot airflow.

[0061] Depend on Figure 5 It is known that the rotating track 7 of the negative electrode plate of an arc root operation status monitoring device is annular, with the central diameter of the ring being 10mm smaller than the inner diameter of the cyclone chamber 2, and the ring width being 2mm. Two Φ2mm holes 8 are symmetrically arranged on the rotating track for installing heat flow meters 4. The area outside the rotating track is coated with insulating and heat-insulating material with an insulation resistance of 1MΩ, and the coating does not peel off under alternating temperatures of 1000℃ and 0℃. A pressure measuring hole 9 with a diameter of 1mm is set in the coated area. The function of the insulating and heat-insulating material is to confine the arc root to the rotating track, and the arc root is driven to rotate along the rotating track by the cyclone airflow. The wall heat flow and surface pressure at the arc root position are measured in real time. After the test, the influence of current, gas flow rate, arc chamber total pressure, and other conditions on the arc root rotation effect can be analyzed based on the collected data. A throat 14 is set in the central area of ​​the negative electrode plate, combined with… Figure 1 It is known that the throat adopts a Laval shape, which facilitates the formation of a supersonic flow field.

[0062] It should be noted that the positive electrode plate, the cyclone chamber, and the negative electrode plate are electrically insulated from each other using an insulating plate, with an insulation resistance of 100kΩ.

[0063] It should be noted that the heat flow meter has a response time of 5ms and a sampling frequency of 200kHz.

[0064] It should be noted that the glass of the observation window should be isolated from the hot air flow by introducing a protective gas.

[0065] It should be noted that the sensor response time is 3ms and the sampling frequency is 150kHz.

[0066] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

[0067] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. An arc root operation status monitoring device, characterized in that: It includes a positive electrode plate (1), a cyclone chamber (2), a negative electrode plate (3), a heat flow meter (4), an observation window (5), and a sensor (6); among which, Positive plate (1) is provided with a first rotating track. The positive arc root moves along the first rotating track. A heat flow meter (4) mounting hole is provided on the first rotating track, and a sensor (6) is installed on the outside. Cyclone chamber (2) is connected to the positive electrode plate (1) at one end and to the negative electrode plate (3) at the other end; it provides rotating airflow and cold air film compression arc column, and an observation window (5) is set on the outside of cyclone chamber (2). The negative electrode plate (3) is provided with a second rotating track. The negative electrode arc root moves along the second rotating track. The heat flow meter (4) mounting hole is provided on the second rotating track, and the sensor (6) is installed on the outside. The throat (14) is provided in the center, and the hot air flow is ejected from the throat (14). Several heat flow meters (4) are installed on the positive plate (1) and the negative plate (3) respectively, and are in contact with the arc root to measure the heat flow density at the arc root; The observation window (5) is used in conjunction with a high-speed camera to observe the running speed and shape of the arc root; Sensor (6), insulated from the arc root, measures the moving speed of the arc root; The positive plate (1) is circular and adopts a water-cooled spray structure; the first rotating track is circular, and the inner and outer sides of the ring are insulating and heat-insulating areas. The insulating and heat-insulating areas are treated with insulation and heat insulation. The insulating and heat-insulating area on the inner side of the ring is provided with a pressure measuring hole (9) to monitor the airflow pressure near the arc root. The cyclone chamber (2) is a cylindrical structure with a water-cooled structure. It has air inlet rings at both ends to introduce supersonic rotating airflow. Several air inlet holes are provided on the cylindrical wall of the cyclone chamber to introduce rotating airflow and form a cold air film. The negative plate (3) adopts a jet water cooling structure; the second rotating track (7) is circular; the inner and outer sides of the ring are both insulation and heat insulation areas; the insulation and heat insulation areas are treated with insulation and heat insulation, and multiple pressure measuring holes (9) are set in the inner insulation and heat insulation area to monitor the airflow pressure near the arc root; a throat (14) is set in the central area of ​​the inner insulation and heat insulation area to form a supersonic flow field.

2. The arc root operation status monitoring device according to claim 1, characterized in that: The center diameters of the first and second rotating tracks are equal, and are 10-15 mm smaller than the inner diameter of the cyclone chamber (2).

3. The arc root operation status monitoring device according to claim 1, characterized in that: Electrical insulation is provided between the positive electrode plate (1) and the cyclone chamber (2), and between the cyclone chamber (2) and the negative electrode plate (3), with an insulation resistance of not less than 2kΩ.

4. The arc root operation status monitoring device according to claim 1, characterized in that: The air intake ring is provided with several air intake holes, and the air intake holes of the several air intake rings are connected on the axis to form a regular polygon; the air intake holes of the cyclone chamber (2) are provided on the cylinder wall in a row of rows connected on the axis to form a regular polygon.

5. The arc root operation status monitoring device according to claim 1, characterized in that: The heat flow meter (4) has a response time of less than 10ms and a sampling frequency of more than 100kHz.

6. The arc root operation status monitoring device according to claim 1, characterized in that: The glass of the observation window (5) is physically isolated from the hot air flow through a cold air film set on the glass surface.

7. The arc root operation status monitoring device according to claim 1, characterized in that: The sensor (6) has a response time of less than 10ms and a sampling frequency of more than 100kHz.

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