Electric arc root operation state monitoring device

Abstract

The invention discloses an electric arc root operation state monitoring device which comprises a positive plate, a cyclone chamber, a negative plate, a heat flow meter and an observation window. Wherein the positive plate is in a circular plate shape, and the arc root of the arc positive electrode is attached to the positive plate rotating track; the swirl chamber is of a cylindrical structure and is mainly used for introducing swirl airflow to compress an electric arc column; the negative plate is annular, the arc root of the electric arc negative electrode is attached to the negative plate rotating track, and hot air flow is sprayed out from the central throat of the negative plate; the heat flow meter is cylindrical and is used for measuring the heat flow density at the arc root; and the observation window is cylindrical and is used for observing the running speed and form of the arc root. The positive plate and the negative plate are respectively connected with the cyclone chamber in a sealing manner, the heat flow meter is connected to a rotating track of the positive plate and the negative plate in a sealing manner, and the observation window is connected with the cyclone chamber in a sealing manner. The device can be applied to the field of aerodynamic thermal ground simulation experiment equipment and is mainly used for monitoring the operation state of the arc root.

Description

Technical Field

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

[0002] With the development of aerodynamic thermal ground simulation technology and special metal smelting technology, various types of arc heaters have been developed. The research on the operation characteristics of arcs has attracted the attention of industry insiders. The arc includes positive arc root, arc column and negative arc root. The characteristics of arc root include operation mechanism, heat flow at arc root, arc root morphology, arc root movement law, arc root movement speed and environmental factors affecting these characteristics. Traditional arc heaters use cylindrical electrodes, and the arc root rotates on the inner surface of the electrode. The cylindrical inner surface is not conducive to external measuring equipment to monitor the arc root operation trajectory; traditional arc heaters set magnetic field coils at the electrodes, and the magnetic field generated by the coils generates electromagnetic interference to external measuring equipment. Summary of the invention

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

[0004] The above object of the present invention is achieved through the following technical solutions:

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

[0006] The positive plate is provided with a first rotating track, the positive arc root 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 outer side;

[0007] The cyclone chamber has one end connected to the positive plate and the other end connected to the negative plate; it provides swirling airflow and cold air film to compress the arc column, and an observation window is arranged on the outside of the cyclone chamber;

[0008] The negative plate is provided with a second rotating track, the negative arc root moves along the second rotating track, a heat flow meter mounting hole is provided on the second rotating track, and a sensor is installed on the outer side; a throat is provided in the center, and the hot air flow is ejected from the throat;

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

[0010] Observation window, used with high-speed camera to observe arc root running speed and shape;

[0011] The sensor, insulated from the arc root, measures the speed of movement of the arc root.

[0012] Furthermore, in the above-mentioned device, the positive electrode plate is in the shape of a circular plate and adopts a jet water cooling structure; the first rotating orbit is in the shape of a circular ring, and the inner and outer sides of the circular ring are both insulating and heat-insulating areas, and the insulating and heat-insulating areas are subjected to insulating and heat-insulating treatment. A pressure measuring hole is set on the inner side of the circular ring for the insulating and heat-insulating area to monitor the airflow pressure near the arc root.

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

[0014] Furthermore, in the above device, the negative electrode plate adopts a spray water cooling structure; the second rotating orbit is in the shape of a ring; the inner and outer sides of the ring are both insulating and heat-insulating areas; the insulating and heat-insulating areas are subjected to insulating and heat-insulating treatment, and a plurality of pressure measuring holes are arranged in the inner insulating and heat-insulating area to monitor the airflow pressure near the arc root; a throat is arranged in the central area of ​​the inner insulating and heat-insulating area to form a supersonic flow field.

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

[0016] Furthermore, in the above device, electrical insulation is adopted between the positive electrode plate and the cyclone chamber, and between the cyclone chamber and the negative electrode plate, and the insulation resistance is not less than 2kΩ.

[0017] Furthermore, in the above device, the intake ring is provided with a plurality of intake holes, and the axes of the intake holes of the plurality of intake rings are connected to form a regular polygonal distribution; the axes of the plurality of rows of intake holes provided on the cylinder wall of the cyclone chamber are connected to form a regular polygonal distribution.

[0018] Furthermore, in the above device, the response time of the heat flow meter is less than 10 ms and the acquisition frequency is greater than 100 kHz.

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

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

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention adopts a circular positive plate and is provided with a rotating track, which is convenient for observing the movement state of the positive arc root and for subsequent measurement of the positive arc spot size;

[0023] (2) The present invention adopts a circular annular negative electrode plate and is provided with a rotating track, which is convenient for observing the movement state of the negative electrode arc root and for subsequent measurement of the negative electrode arc spot size;

[0024] (3) The present invention uses the cyclone gas in the cyclone chamber to drive the arc root to rotate, eliminating the magnetic field coil and eliminating the electromagnetic interference of the magnetic field to the 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 shape of the arc root;

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

[0028] (7) The arc root operating status monitoring device used in the present invention can be used to monitor the impact of various input conditions of the arc heater on the arc root operating status. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0033] Figure 5 It is a schematic diagram of the layout of the negative plate surface of the present invention. DETAILED DESCRIPTION

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

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

[0036] The 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 outer side;

[0037] The cyclone chamber 2 is connected to the positive plate 1 at one end and to the negative plate 3 at the other end; it provides a swirling airflow and a cold air film to compress the arc column, and an observation window 5 is arranged outside the cyclone chamber 2;

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

[0039] A plurality of heat flux meters 4 are respectively mounted on the positive plate 1 and the negative plate 3, 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 to observe the arc root running speed and shape;

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

[0042] Preferably, the positive plate 1 is in the shape of a circular plate and adopts a spray water cooling structure; the first rotating track is in the shape of a circular ring, and the inner and outer sides of the circular ring are both insulating and heat-insulating areas, and the insulating and heat-insulating areas are subjected to insulating and heat-insulating treatment. A pressure measuring hole is set on the inner side of the circular ring for the insulating and heat-insulating area to monitor the airflow pressure near the arc root.

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

[0044] Preferably, the negative electrode plate 3 adopts a spray water cooling structure; the second rotating track 7 is in the shape of a ring; the inner and outer sides of the ring are both insulating and heat-insulating areas; the insulating and heat-insulating areas are subjected to insulating and heat-insulating treatment, and a plurality of pressure measuring holes 9 are arranged in the inner insulating and heat-insulating area to monitor the airflow pressure near the arc root; a throat 14 is arranged 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 rotating track and the second rotating track are equal and are 10-15 mm smaller than the inner diameter of the cyclone chamber 2 .

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

[0047] Preferably, the intake ring is provided with a plurality of intake holes, and the axes of the intake holes of the plurality of intake rings are connected to form a regular polygonal distribution; the axes of the plurality of rows of intake holes provided on the cylinder wall of the cyclone chamber 2 are connected to form a regular polygonal distribution.

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

[0049] Preferably, the glass of the observation window 5 is physically isolated from the hot air flow by a cold air film arranged on the surface of the glass.

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

[0051] Example

[0052] Depend on Figure 1 It can be seen that an arc root operation status monitoring device includes a positive plate 1, a cyclone chamber 2, a negative plate 3, a heat flux meter 4, an observation window 5 and a sensor 6, and adjacent components are sealed and connected.

[0053] The positive plate 1 provides a positive arc root rotation track, the positive arc root moves along the rotation track, a heat flow meter 4 mounting hole is arranged on the rotation track, and a sensor 6 is arranged outside the positive plate 1;

[0054] The cyclone chamber 2 provides a swirling airflow and a cold air film to compress the arc column. An observation window 5 is provided 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 plate 3 provides a negative arc root rotation track, and the negative arc root moves along the rotation track. A heat flow meter 4 mounting hole is arranged on the rotation track, a sensor 6 is arranged on the outer side of the negative plate 3, and a throat is arranged in the central area of ​​the negative plate 3, and the hot air flow is ejected from the throat;

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

[0057] The 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 moving speed of the arc root.

[0059] Depend on Figure 2 It can be seen that the rotating track 7 of the positive plate 1 of an arc root operation status monitoring device is in the shape of a circular ring, the center diameter of the ring is 10mm smaller than the inner diameter of the cyclone chamber 2, and the width of the ring is 2mm. Two Φ2mm holes 8 are symmetrically arranged on the rotating track for installing the heat flow meter 4. The area outside the rotating track is sprayed with insulating and heat-insulating materials with an insulation resistance of 1MΩ. The coating does not fall off under the alternating action of 1000℃ and 0℃. A pressure measuring hole 9 with a diameter of 1mm is arranged in the coating area. The function of these devices is to limit the arc root on the rotating track, drive the arc root to rotate along the rotating track by the cyclone flow, 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, 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 can be seen that a cyclone chamber of an arc root operation status monitoring device is composed of an intake ring 10 and an equal straight section 11. Two windows 12 are arranged on the equal straight section, and the extension lines of the windows are aligned with the rotating track; the intake ring is provided with 2 rows of 8 intake holes, and the upstream pressure is used to control the airflow to enter the cyclone chamber at a supersonic speed as the main working medium; the equal straight section is provided with 9 rows of intake holes 13, 8 in each row, and the pressure controls the airflow to enter the cyclone chamber at a subsonic speed to form a cold air film. The arrangement of each row of intake 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 air inlet downstream, forming a closed airflow, which has a good compression effect on the arc column and protects the inner surface of the straight section from being burned by the hot air flow.

[0061] Depend on Figure 5 It can be seen that the rotating track 7 of the negative plate of an arc root operation status monitoring device is in the shape of a circular ring. The center diameter of the ring is 10mm smaller than the inner diameter of the cyclone chamber 2, and the width of the ring is 2mm. Two Φ2mm holes 8 are symmetrically arranged on the rotating track for installing the heat flow meter 4. The area outside the rotating track is sprayed with insulating and heat-insulating materials with an insulation resistance of 1MΩ. The coating does not fall off under the alternating action of 1000℃ and 0℃. A pressure measuring hole 9 with a diameter of 1mm is arranged in the coating area. The function of the insulating and heat-insulating material is to limit the arc root on the rotating track. The arc root is driven to rotate along the rotating track by the cyclone flow, and the wall heat flux and surface pressure at the arc root position are measured in real time. After the test, the influence of current, gas flow, 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 arranged in the central area of ​​the negative plate, combined with Figure 1 It can be seen that the throat adopts a Laval shape, which is convenient for forming a supersonic flow field.

[0062] It should be noted that the positive plate, the cyclone chamber and the negative plate are electrically insulated by an insulating plate, and the insulation resistance reaches 100 kΩ.

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

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

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

[0066] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applicable to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

[0067] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. An arc root operating status monitoring device, characterized in that: It comprises 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: The positive electrode plate (1) is provided with a first rotating track, the positive electrode 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 outer side; A cyclone chamber (2) is connected to the positive plate (1) at one end and to the negative plate (3) at the other end; it provides a cyclone airflow and a cold air film to compress the arc column; an observation window (5) is arranged outside the 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, a heat flow meter (4) mounting hole is provided on the second rotating track, and a sensor (6) is installed on the outer side; a throat (14) is provided in the center, and a hot air flow is ejected from the throat (14); A plurality of heat flux meters (4) are respectively mounted on the positive plate (1) and the negative plate (3) and are in contact with the arc root to measure the heat flux density at the arc root; An observation window (5) is used in conjunction with a high-speed camera to observe the arc root running speed and shape; The sensor (6) is insulated from the arc root and measures the moving speed of the arc root.

2. The arc root operation status monitoring device according to claim 1, characterized in that: The positive plate (1) is in the shape of a circular plate and adopts a spray water cooling structure; the first rotating track is in the shape of a circular ring, the inner and outer sides of the circular ring are both insulating and heat-insulating areas, and the insulating and heat-insulating areas are subjected to insulating and heat-insulating treatment. A pressure measuring hole (9) is provided in the insulating and heat-insulating area on the inner side of the circular ring to monitor the airflow pressure near the arc root.

3. The arc root operation status monitoring device according to claim 1, characterized in that: The cyclone chamber (2) is a cylindrical structure, adopts a water-cooling structure, and is provided with air inlet rings at both ends to introduce supersonic swirling airflow. A plurality of air inlet holes are provided on the cylinder wall of the cyclone chamber to introduce swirling airflow to form a cold air film.

4. The arc root operation status monitoring device according to claim 1, characterized in that: The negative electrode plate (3) adopts a spray water cooling structure; the second rotating track (7) is annular; the inner and outer sides of the annular ring are both insulating and heat-insulating areas; the insulating and heat-insulating areas are subjected to insulating and heat-insulating treatment, and a plurality of pressure measuring holes (9) are arranged in the inner insulating and heat-insulating area to monitor the airflow pressure near the arc root; a throat (14) is arranged in the central area of ​​the inner insulating and heat-insulating area to form a supersonic flow field.

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

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

7. The arc root operation status monitoring device according to claim 3 is characterized in that: The air intake ring is provided with a plurality of air intake holes, and the axes of the air intake holes of the plurality of air intake rings are connected to form a regular polygonal distribution; the axes of the plurality of rows of air intake holes provided on the cylinder wall of the cyclone chamber (2) are connected to form a regular polygonal distribution.

8. 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 10 ms and a collection frequency of greater than 100 kHz.

9. 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 by a cold air film arranged on the surface of the glass.

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

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