A composite cathode high-power plasma arc ignition power supply

Abstract

The application provides a kind of composite cathode high-power plasma arc ignition power supply, belongs to the technical field of plasma spraying, is composed of power supply control cabinet and arc ignition cabinet, and outputs stable and reliable DC 1000V.The positive pole of the power supply control cabinet is connected to the positive terminal of the plasma torch power supply, and the negative pole of the power supply control cabinet is connected to the negative terminal of the plasma torch power supply.The connecting wire is reliably connected through cold-rolled terminals.The arc provided by the arc ignition cabinet ionizes the gas inside the plasma torch, and completes the ignition of the plasma torch.The components of the application are simple to install and connect, and easy to manufacture and install.

Description

Technical Field

[0001] This invention belongs to the field of plasma spraying technology, specifically relating to a high-power plasma arc ignition power supply with a composite cathode. Background Technology

[0002] High-temperature plasma generated by electric arc discharge is called arc plasma, which belongs to the category of thermal plasma. Thermal plasma is characterized by high temperature, high enthalpy, high energy density, and controllable atmosphere, and can be widely used in machining, spraying, materials preparation, waste treatment, energy and other fields. Large-scale industrial applications require plasma generators to have high stability, high power, high efficiency and long lifespan.

[0003] Most existing non-transfer arc plasma generators use a high-frequency start-up method, introducing a trigger electrode to form a discharge between the cathode and the trigger electrode. The discharge arc is sprayed towards the anode, igniting the arc between the cathode and anode. What they have in common is that the distance between the cathode and anode is small, making it impossible to obtain a large power through a simple two-electrode structure.

[0004] To improve the power of plasma generators, existing plasma generators are developing towards having inter-electrode insertion sections. The structure of a plasma generator consists of a cathode component, an anode component, an inter-electrode insertion section, and inert gas and water cooling components introduced between each electrode. Since the inter-electrode insertion section has a complex structure and requires power, gas, and water cooling, how to solve the above-mentioned manufacturing and installation difficulties is a problem that still has industrialization prospects and urgently needs to be solved. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a composite cathode high-power plasma arc ignition power supply, which consists of a power control cabinet and an arc ignition cabinet. It outputs a stable and reliable DC 1000V. The positive terminal of the power control cabinet is connected to the positive terminal of the plasma torch power supply, and the negative terminal of the power control cabinet is connected to the negative terminal of the plasma torch power supply. The connecting wires are reliably connected through cold-rolled terminals. The gas inside the plasma torch is ionized by the arc provided by the arc ignition cabinet to complete the plasma torch ignition.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A composite cathode high-power plasma arc ignition power supply consists of a power control cabinet and an arc ignition cabinet. It outputs a stable and reliable DC 1000V. The positive terminal of the power control cabinet is connected to the positive terminal of the plasma torch power supply, and the negative terminal of the power control cabinet is connected to the negative terminal of the plasma torch power supply. The connecting wires are reliably connected through cold-rolled terminals. The arc provided by the arc ignition cabinet ionizes the gas inside the plasma torch, thus completing the plasma torch ignition.

[0008] Beneficial effects:

[0009] The components of this invention are simple to install and connect, and easy to manufacture and install. This invention achieves a 100% arc ignition success rate, enabling the application of high-frequency, high-voltage arc ignition power supplies in high-power plasma torches. Attached Figure Description

[0010] Figure 1 Electrical schematic diagram;

[0011] Figure 2 This is a diagram showing the pinout. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0013] like Figure 1 As shown, the composite cathode high-power plasma arc ignition power supply of the present invention consists of a power control cabinet and an arc ignition cabinet, and outputs a stable and reliable DC 1000V. The positive terminal of the power control cabinet is connected to the positive terminal of the plasma torch power supply, and the negative terminal of the power control cabinet is connected to the negative terminal of the plasma torch power supply. The connecting wires are reliably connected through cold-rolled terminals. The gas inside the plasma torch is ionized by the arc provided by the arc ignition cabinet to complete the ignition of the plasma torch.

[0014] The composite cathode high-power plasma arc ignition power supply of the present invention mainly includes a filter circuit, a high-frequency resonant circuit, a boost circuit, and an arc ignition circuit. The filter circuit includes capacitors C1, C2, and C3, an energy storage filter C4, and C5; the high-frequency resonant circuit includes an energy storage filter C4, a resistor R6, capacitor C1, resistor R1, and resistor R2; the boost circuit includes a high-voltage discharge coil T1, an energy storage filter C4, and a resistor R6; the arc ignition circuit includes a high-voltage discharge coil T1, a discharge device G1, an inductor H1, contactors KM1 and KM2, capacitors C5 and C3, and a resistor R4.

[0015] The plasma torch is powered by a DC 1000V voltage applied to its arc-ignition terminal via an arc-ignition cabinet. The positive and negative terminals of the torch power supply are also powered by a DC 1000V voltage applied through a power control cabinet. The power control cabinet is connected to an AC 220V power supply, providing power to its components. The L line is the live wire, and the N line is the neutral wire. Through circuit breaker Q1, the normally closed contactor KM2, and diodes VD1 and VD2, the energy storage filter C4 is charged. Resistor R5 is a current-limiting resistor connected to the normally closed contactor KM2. The normally open contact of another contactor KM2 is connected to the high-voltage discharge coil T1. The other end of the high-voltage discharge coil T1 is connected to capacitor C5 and discharge device G1. The energy storage filter C4 and resistor R6 are connected to the half-wave rectifier input, forming the first half of the power input.

[0016] The discharge device G1 ionizes the gas at the ignition point of the plasma torch using a high-voltage arc generated by the high-voltage discharge coil T1. Capacitor C5 serves as an isolation and filter. The DC 1000V input is filtered by contactor KM1 through capacitor C2. Capacitor C1 stores energy, and R3 is a current-limiting resistor. Capacitor C1 is connected in parallel with resistors R1 and R2 (which are in series). One end of the parallel circuit is connected to resistor R3, and the other end is connected to the parallel capacitor C3 and resistor R4. Resistors R1 and R2 provide the necessary energy for ionization when residual energy in the capacitors is released and the DC input is applied to the plasma torch. One end of inductor H1 is connected between the discharge device G1 and the ignition point of the plasma torch, and the other end of inductor H1 is connected to the R+ terminal of the DC 1000V input.

[0017] The AC input is AC 220V, and the DC input is DC 1000V. The R+ terminal is supplied from the power control cabinet. The control and feedback of contactor KM1 and the two contactors KM2 are connected to the power control cabinet through the terminal block. The main control is completed by the power control cabinet. The R+ terminal is used for arc energy release and sampling measurement.

[0018] Preferably, the energy storage filter C4 is charged using the AC input side, and after charging is completed, the high-voltage discharge coil T1 is discharged and coupled.

[0019] Preferably, the DC input side is used to filter capacitor C2, capacitor C1 is used to store energy, resistor R3 is a current-limiting resistor to suppress the current of capacitor C1, and resistors R1 and R2 are used to release the residual electrical energy of capacitors C1 and C2 after power-off, so as to provide the necessary electrical energy for the ionization of the plasma torch ionizer.

[0020] Preferably, the arc control cabinet is controlled and measured by a power control cabinet.

[0021] Preferably, by filling the energy storage filter C4, engaging the contactor KM1, and closing the contactor KM2, the electrical energy of the energy storage filter C4 is used to generate an electric arc in the discharge device of the high-voltage discharge coil T1.

[0022] Preferably, the discharge time of the high-voltage discharge coil T1 is controllable. The discharge time of the high-voltage discharge coil T1 is controlled within 1 second to provide sufficient ignition time for the plasma torch.

[0023] Preferably, by adjusting the spacing between the discharge devices G1, the maximum arc ignition voltage is controlled to be 20KV, and the voltage is fed into the arc ignition electrode of the plasma torch by the lead wire, forming a gap discharge between the cathode and the arc ignition electrode.

[0024] Preferably, the plasma torch arc channel outlet is kept dry, and the nitrogen flow rate fed into the plasma torch is within a reasonable range, preferably within 15 cubic meters per hour.

[0025] Preferably, a voltage not exceeding DC 1200 is applied between the cathode and anode of the plasma torch, and the arc ignition power supply is started simultaneously, forming a stable discharge arc channel under the action of a stable airflow.

[0026] like Figure 2 The diagram shows the pinout, where the meanings of the indicator symbols are as follows:

[0027] 30 and 31 are the cable markings on both sides of the normally open contact of the contactor;

[0028] PE stands for ground wire in electrical cables;

[0029] L6 is the identifier for contact A1 of the KM2 contactor coil;

[0030] L5 is the contact mark for contactor A1 of contactor KM1 and contactor KM2.

[0031] L4 is the normally open contact designation for KM2 contactor;

[0032] L1 is the common point signal identifier;

[0033] 3, 4, 13, 12, and 11 are all terminal pin identification numbers;

[0034] PE stands for ground wire in electrical cables;

[0035] N is the neutral wire marking for electrical cables;

[0036] L is the live wire indicator for electrical cables.

[0037] ①②③④⑤⑥⑦ are all terminal markings;

[0038] In the contactor, A1 and A2 are the terminal markings;

[0039] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-power plasma arc ignition power supply with a composite cathode, characterized in that, It consists of a power control cabinet and an arc ignition cabinet, and outputs a stable and reliable DC 1000V. The positive terminal of the power control cabinet is connected to the positive terminal of the plasma torch power supply, and the negative terminal of the power control cabinet is connected to the negative terminal of the plasma torch power supply. The connecting wires are reliably connected through cold-rolled terminals. The gas inside the plasma torch is ionized by the electric arc provided by the arc ignition cabinet to complete the plasma torch ignition. It includes a filter circuit, a high-frequency resonant circuit, a boost circuit, and an arc-starting circuit; the filter circuit includes capacitors C1, C2, and C3, an energy storage filter C4, and C5; the high-frequency resonant circuit includes an energy storage filter C4, a resistor R6, capacitor C1, resistor R1, and resistor R2; the boost circuit includes a high-voltage discharge coil T1, an energy storage filter C4, and a resistor R6; the arc-starting circuit includes a high-voltage discharge coil T1, a discharge device G1, an inductor H1, contactors KM1 and KM2, capacitors C5 and C3, and a resistor R4; Through circuit breaker Q1, contactor KM2's normally closed contact, diodes VD1 and VD2 charge energy storage filter C4, and current-limiting resistor R5 is connected to contactor KM2's normally closed contact; another contactor KM2's normally open contact is connected to high-voltage discharge coil T1, and the other end of high-voltage discharge coil T1 is connected to capacitor C5 and discharge device G1; energy storage filter C4 and resistor R6 are connected to the half-wave rectifier input, which is the first half of the power input; The discharge device G1 ionizes the gas at the ignition point of the plasma torch through a high-voltage arc generated by the high-voltage discharge coil T1. Capacitor C5 serves as an isolation and filter. The DC 1000V input is filtered by contactor KM1 through capacitor C2. Capacitor C1 stores energy, and R3 is a current-limiting resistor. Capacitor C1 is connected in parallel with resistors R1 and R2, which are in series. One end of the parallel circuit is connected to resistor R3, and the other end is connected to capacitor C3 and resistor R4. Resistors R1 and R2 provide the energy required for ionization when residual energy in the capacitors is released and the DC input is applied to the plasma torch. One end of inductor H1 is connected between the discharge device G1 and the ignition point of the plasma torch, and the other end of inductor H1 is connected to the R+ terminal of the DC 1000V. By filling the energy storage filter C4, contactor KM1 is activated and contactor KM2 is closed, and the electrical energy of the energy storage filter C4 is used to generate an electric arc in the discharge device of the high-voltage discharge coil T1.

2. The composite cathode high-power plasma arc ignition power supply according to claim 1, characterized in that, The energy storage filter C4 is charged using the AC input side, and after charging is completed, the high-voltage discharge coil T1 is discharged and coupled.

3. The composite cathode high-power plasma arc ignition power supply according to claim 1, characterized in that, The DC input side is used to filter capacitor C2, capacitor C1 is used to store energy, resistor R3 is a current limiting resistor to suppress the current of capacitor C1, and resistors R1 and R2 are used to release the residual electrical energy of capacitors C1 and C2 after power is turned off, so as to provide electrical energy for plasma torch ionization.

4. The composite cathode high-power plasma arc ignition power supply according to claim 1, characterized in that, The arc control cabinet is used to control and measure the arc ignition cabinet.

5. A high-power plasma arc ignition power supply with a composite cathode according to claim 1, characterized in that, The discharge time of the high-voltage discharge coil T1 is controllable, and the discharge time of the high-voltage discharge coil T1 is controlled within 1 second, providing sufficient ignition time for the plasma torch.

6. A high-power plasma arc ignition power supply with a composite cathode according to claim 1, characterized in that, By adjusting the spacing between the discharge devices G1, the maximum arc ignition voltage is controlled to 20KV. The voltage is fed into the arc ignition electrode of the plasma torch through the lead wire, forming a gap discharge between the cathode and the arc ignition electrode.

7. A composite cathode high-power plasma arc ignition power supply according to claim 1, characterized in that, The outlet of the plasma torch arc channel is kept dry, and the nitrogen flow rate fed into the plasma torch is less than 15 cubic meters per hour.

8. A high-power plasma arc ignition power supply with a composite cathode according to claim 1, characterized in that, A voltage not exceeding DC 1200 is applied between the cathode and anode of the plasma torch, and the arc ignition power supply is started simultaneously. Under the action of a stable airflow, a stable discharge arc channel is formed.

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