Circuit protection device for isotope electromagnetic separator

Abstract

The utility model discloses a circuit protection device for an isotope electromagnetic separator, which relates to the technical field of isotope electromagnetic separators and comprises an ion source high-voltage cabinet, an ion source low-voltage cabinet, an ion source, a current limiting device and a ground bar, the current limiting device is arranged between the ion source high-voltage cabinet and the ion source low-voltage cabinet, and the ion source low-voltage cabinet supplies power to the ion source. And the ion source high-voltage cabinet, the ion source low-voltage cabinet and the ion source are connected with the ground through a ground bar. The current limiting device is arranged in the ion source high-voltage loop of the isotope electromagnetic separator, the current limiting device is convenient to install and high in insulating property, and damage to the ion source low-voltage power supply caused by high-voltage loop large current generated by frequent ignition in the ion source or frequent load change of the ion source can be avoided; and the stability and the safety of the whole circuit are improved.

Description

Technical Field

[0001] The present application relates to the technical field of isotope electromagnetic separators, and in particular to a circuit protection device for isotope electromagnetic separators. Background Art

[0002] In the prior art, for stable isotope electromagnetic separators, during the experiment, the high voltage inside the ion source frequently sparked, causing the low voltage power supply of the ion source to be damaged. Sometimes during the experiment, the arc discharge power supply often has "hiccups" protection when sparking, thus affecting the safety and stability of the experiment. Analyzing the reasons, once the ion source frequently sparks, a large number of high-energy particles are generated. These particles will cause discharge phenomena such as arcs and sparks, and the energy released during the discharge process will directly lead to an increase in current in the high voltage circuit of the ion source, and flow directly to the low voltage power supply of the ion source through its circuit. Although there is also overcurrent protection inside the low voltage power supply of the ion source, due to the frequent changes in the ion source load, the overcurrent protection device of the ion source voltage power supply may not be able to respond or trigger the protection in time, resulting in the low voltage power supply of the ion source being subjected to excessive current, and then "hiccups" protection or damage may occur.

[0003] In actual application, the metal bracket on the current limiting resistor will affect the insulation performance of the ion source to a certain extent. Directly connecting the current limiting resistor between the high-voltage power supply and the low-voltage power supply of the ion source will also cause the current limiting resistor to be unstable and easily broken down by high voltage. Therefore, there is an urgent need for a device that can provide the function of current limiting resistor and ensure insulation performance. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a circuit protection device for an isotope electromagnetic separator, which is used to limit the current in the high-voltage circuit, thereby avoiding damage to the low-voltage power supply of the ion source caused by the high-voltage circuit current generated by frequent sparks inside the ion source or frequent changes in the ion source load, thereby improving the stability and safety of the circuit. The following technical solutions are adopted:

[0005] A circuit protection device for an isotope electromagnetic separator, characterized by comprising:

[0006] Ion source high-voltage cabinet, ion source low-voltage cabinet, ion source, current limiting device, ground row;

[0007] The ion source high voltage cabinet includes a positive high voltage power supply;

[0008] The ion source low-voltage cabinet includes a crucible power supply, an arc chamber heating power supply, an arc discharge power supply, and a filament power supply;

[0009] The ion source includes a filament, a cathode, an arc chamber, and a crucible;

[0010] The current limiting device includes a fixing bracket, an insulating support seat, a current limiting resistor, and a fixing clamp;

[0011] The current limiting device is arranged between the ion source high voltage cabinet and the ion source low voltage cabinet, the ion source low voltage cabinet supplies power to the ion source, and the ion source high voltage cabinet, the ion source low voltage cabinet and the ion source are connected to the ground through a ground row.

[0012] Furthermore, the current limiting device is arranged between the ion source high-voltage cabinet and the ion source low-voltage cabinet, and includes: one end of the fixed bracket is fixed to the isotope electromagnetic separator, and the other end is connected to the insulating support seat through a bolt structure, and the current limiting resistor is fixed to the insulating support seat through a fixing clamp.

[0013] Furthermore, the insulating support seat is a U-shaped structure, and the current-limiting resistor is placed in the U-shaped structure.

[0014] Furthermore, the insulating support seat is made of ceramic material.

[0015] Furthermore, the fixing clamp includes at least one elastic clamp, which fixes the insulating support seat and the current-limiting resistor through a bolt structure.

[0016] Furthermore, it also includes: one end of the current limiting resistor is connected to the positive electrode of the positive high-voltage power supply, and the other end is connected to the negative electrode of the crucible power supply, the negative electrode of the arc chamber heating power supply, and the positive electrode of the arc discharge power supply.

[0017] Furthermore, the resistance of the current limiting resistor ranges from 10 kΩ to 25 kΩ.

[0018] By adopting the above technical scheme, a fixed bracket is arranged on the isotope electromagnetic separator, the fixed bracket is connected to the U-shaped insulating support seat, and the current limiting resistor is fixed on the U-shaped insulating support seat and fixed with a clamp to achieve the insulation installation of the current limiting resistor. Then, through experimental selection of the current limiting resistor, the current limiting resistor is connected in series in the high-voltage circuit of the ion source, which can avoid the damage of the low-voltage power supply of the ion source caused by the high-voltage circuit large current generated by frequent sparks inside the ion source or frequent changes in the ion source load, and can improve the stability and safety of the entire circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a schematic diagram of the structure of a circuit protection device for an isotope electromagnetic separator.

[0020] Figure 2 The utility model is a schematic diagram of a U-shaped insulating support seat structure of a circuit protection device for an isotope electromagnetic separator.

[0021] Figure 3The utility model discloses a circuit principle diagram of a circuit protection device for an isotope electromagnetic separator.

[0022] Explanation of the accompanying drawings: 1. Ion source high-voltage cabinet; 101. Positive high-voltage power supply; 2. Ion source low-voltage cabinet; 201. Crucible power supply; 202. Arc chamber heating power supply; 203. Arc discharge power supply; 204. Filament power supply; 3. Ion source; 301. Filament; 302. Cathode; 303. Arc chamber; 304. Crucible; 4. Current limiting device; 401. Fixed bracket; 402. Insulating support seat; 403. Current limiting resistor; 5. Ground bar. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model.

[0024] The principle of the utility model is that due to frequent sparks inside the ion source or frequent changes in the ion source load, a high-voltage loop current will be generated when high voltage is applied to the ion source, and this current will cause damage to the low-voltage power supply of the ion source. If the current limiting resistor is directly connected to the circuit, there is also the problem of the current limiting resistor being broken down by the current in the high-voltage loop. The utility model provides a circuit protection device that is easy to install and has high insulation performance, which achieves the purpose of protecting the low-voltage power supply of the ion source and reducing the breakdown of the current limiting resistor.

[0025] The following is combined with the accompanying drawings Figure 1 , Figure 2 and Figure 3 This application is described in further detail.

[0026] The present embodiment discloses a circuit protection device for an isotope electromagnetic separator, comprising: an ion source high voltage cabinet 1, an ion source low voltage cabinet 2, an ion source 3, a current limiting device 4, and a ground row 5. The ion source high voltage cabinet 1 comprises a positive high voltage power supply 101, and the ion source low voltage cabinet 2 comprises a crucible power supply 201, an arc chamber heating power supply 202, an arc discharge power supply 203, and a filament power supply 204. The ion source 3 comprises a filament 301, a cathode 302, an arc chamber 303, and a crucible 304. The current limiting device 4 comprises a fixing bracket 401, an insulating support seat 402, and a current limiting resistor 403.

[0027] The current limiting device 4 is arranged between the ion source high voltage cabinet 1 and the ion source low voltage cabinet 2 . The ion source low voltage cabinet 2 supplies power to the ion source 3 . The ion source high voltage cabinet 1 , the ion source low voltage cabinet 2 , and the ion source 3 are connected to the ground through the ground row 5 .

[0028] One end of the fixing bracket 401 is fixed on the isotope electromagnetic separator, and the other end is connected to the insulating support seat 402 through a bolt structure. The current limiting resistor 403 is fixed to the insulating support seat 402 through a fixing clip.

[0029] The insulating support seat 402 is a U-shaped structure, and the current limiting resistor 403 is placed in the U-shaped structure. The length of the U-shaped structure is not less than the length of the current limiting resistor.

[0030] The insulating support seat 402 is made of ceramic material, which is made of high-strength and high-heat-resistant ceramic material and can withstand the high temperature and high pressure of the current limiting resistor.

[0031] The insulating support seat 402 is made of a ceramic material with a certain thickness. Two through holes are arranged below the U-shaped structure, so that the fixing bracket 401 passes through the two holes and is fixed by an insulating nut.

[0032] The fixing clamp includes but is not limited to a bolt structure, an elastic clamp, and a fixing tie, which is used to surround the insulating support seat 402, wrap and fix the current limiting resistor 403, and the number, position and clamping force of the clamps can be flexibly adjusted to ensure that the current limiting resistor 403 is firmly fixed on the insulating support seat 402.

[0033] The current limiting resistor 403 uses a winding resistor, including but not limited to a flat winding resistor, a corrugated resistor, and an adjustable resistor. In terms of resistance characteristics, the resistance value changes relatively little with the change of current size. In terms of inductance characteristics, the coil structure has a strong inductance characteristic, which can block high-frequency signals and filter high-frequency signals in the circuit. The winding resistor also has a small size, a large power bearing capacity, and good heat dissipation performance, and is suitable for current limiting circuits with higher power and higher voltage requirements.

[0034] One end of the current limiting resistor 403 is connected to the positive electrode of the positive high voltage power supply 101 , and the other end is connected to the negative electrode of the crucible power supply 201 , the negative electrode of the arc chamber heating power supply 202 , and the positive electrode of the arc discharge power supply 203 .

[0035] The resistance range of the current limiting resistor is 10kΩ to 25kΩ.

[0036] In one embodiment of the present application, according to the high voltage power supply requirements of the on-site stable isotope electromagnetic separator, the high voltage power supply is selected to be 35kV, and its maximum working current is 40mA. According to the overcurrent threshold protection setting of the ion source low voltage power supply, the circuit current limit is set to 3.5A, that is, I = 40mA and I limit =3.5A.

[0037] When the current is 40mA, the impedance of the ion source arc can be calculated by the following formula:

[0038] R=V / I=35kV / 40mA=0.875MΩ

[0039] When the high voltage is ignited and the current limit is 3.5A, the resistance of the current limiting resistor can be calculated by the following formula:

[0040] Rlimit =V / I limit =35kV / 3.5A=10KΩ

[0041] With a 10KΩ current limiting resistor, the high voltage loop current under the maximum current of normal operation is

[0042] I1=V / (R+R limit )=35kV / (10KΩ+0.875MΩ)=39.55mA, current

[0043] The voltage drop across the resistor is

[0044] Vdrop=I1*R limit =39.55mA×10kΩ=395.5V

[0045] From this we can see that the pressure drop is negligible for the normal high pressure of the ion source.

[0046] To calculate the power of the current limiting resistor, the following formula can be used:

[0047] Under normal maximum current operation, the power loss on the current limiting resistor is

[0048] P=I1^2*R limit _1=(39.55mA)^2*×10kΩ=15.6W

[0049] Therefore, the resistance of the resistor body is required to be 10KΩ and the power is required to be greater than 15.6W.

[0050] In another embodiment of the present application, according to the high voltage power supply requirements of the on-site stable isotope electromagnetic separator, the high voltage power supply is selected to be 35kV, and its maximum working current is 40mA. According to the overcurrent threshold protection setting of the ion source low voltage power supply, the circuit current limit is 3.5A, that is, I = 40mA and I limit =3.5A.

[0051] When the current is 40mA, the impedance of the ion source arc can be calculated by the following formula:

[0052] R=V / I=35kV / 40mA=0.875MΩ

[0053] When the high voltage is ignited and the current limit is 3.5A, the resistance of the current limiting resistor can be calculated by the following formula:

[0054] R limit =V / I limit =35kV / 3.5A=10KΩ

[0055] With a 25KΩ current limiting resistor, the high voltage loop current under the maximum current of normal operation is

[0056] I1=V / (R+R limit )=35kV / (25KΩ+0.875MΩ)=38.89mA, current

[0057] The voltage drop across the resistor is:

[0058] Vdrop=I1*R limit =38.89mA×25kΩ=972V

[0059] Meet the resistance voltage drop requirement within 1kV.

[0060] To calculate the power of a resistor, use the following formula:

[0061] Under normal maximum current operation, the power loss on the current limiting resistor is

[0062] P=I1^2*R limit _1=(38.89mA)^2*×25kΩ=37.8W

[0063] Therefore, the resistance of the resistor body is required to be 25KΩ and the power is required to be greater than 37.8W.

[0064] In another embodiment of the present application, Figure 3 As shown, one end of the current limiting resistor 403 is connected to the 35kV positive electrode of the positive high-voltage power supply 101, and the other end is connected to the ion source low-voltage power supply equipotential body, including the negative electrode of the crucible power supply 201, the negative electrode of the arc chamber heating power supply 202, the positive electrode of the arc discharge power supply 203, and the filament power supply 204. The crucible power supply 201 uses 200A / 25V, the arc chamber heating power supply 202 uses 60A / 50V, the arc discharge power supply 203 uses 500V / 6A, and the filament power supply 204 uses 250V / 25V, all of which are suspended above the high voltage +35kV potential through the ion source low-voltage power supply equipotential body. The positive pole of the crucible power supply 201 is connected to the crucible 304, the positive pole of the arc chamber heating power supply 202 is connected to the arc chamber 303, the negative pole of the arc discharge power supply 203 is connected to the cathode 302 after being connected in series with a resistor, the two ends of the filament power supply 204 are connected to the filament 301, and the ion source high voltage cabinet 1, the ion source low voltage cabinet 2, and the ion source 3 are connected to the ground through the ground row 5 to form a high voltage discharge circuit. When high voltage is applied to the circuit and sparks are generated, the current limiting resistor in the high voltage spark circuit provides overcurrent protection.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the protection content of the present invention.

[0066] The above description is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any equivalent replacement or change of the technical scheme and concept of the present invention by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A circuit protection device for an isotope electromagnetic separator, characterized in that: include: Ion source high-voltage cabinet, ion source low-voltage cabinet, ion source, current limiting device, ground row; The ion source high voltage cabinet includes a positive high voltage power supply; The ion source low-voltage cabinet includes a crucible power supply, an arc chamber heating power supply, an arc discharge power supply, and a filament power supply; The ion source includes a filament, a cathode, an arc chamber, and a crucible; The current limiting device includes a fixing bracket, an insulating support seat, a current limiting resistor, and a fixing clamp; The current limiting device is arranged between the ion source high voltage cabinet and the ion source low voltage cabinet, the ion source low voltage cabinet supplies power to the ion source, and the ion source high voltage cabinet, the ion source low voltage cabinet and the ion source are connected to the ground through a grounding bar.

2. A circuit protection device for an isotope electromagnetic separator according to claim 1, characterized in that: The current limiting device is arranged between the ion source high-voltage cabinet and the ion source low-voltage cabinet, and includes: one end of the fixed bracket is fixed to the isotope electromagnetic separator, and the other end is connected to the insulating support seat through a bolt structure, and the current limiting resistor is fixed to the insulating support seat through a fixing clamp.

3. A circuit protection device for an isotope electromagnetic separator according to claim 2, characterized in that: The insulating support seat is a U-shaped structure, and the current-limiting resistor is placed in the U-shaped structure.

4. A circuit protection device for an isotope electromagnetic separator according to claim 3, characterized in that: The insulating support seat is made of ceramic material.

5. A circuit protection device for an isotope electromagnetic separator according to claim 2, characterized in that: The fixing clamp includes at least one elastic clamp, which fixes the insulating support seat and the current-limiting resistor through a bolt structure.

6. A circuit protection device for an isotope electromagnetic separator according to claim 2, characterized in that: Also includes: One end of the current limiting resistor is connected to the positive electrode of the positive high-voltage power supply, and the other end is connected to the negative electrode of the crucible power supply, the negative electrode of the arc chamber heating power supply, and the positive electrode of the arc discharge power supply.

7. A circuit protection device for an isotope electromagnetic separator according to claim 6, characterized in that: The resistance of the current limiting resistor ranges from 10 kΩ to 25 kΩ.

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