High Power Magnetron Cathode Cable Microwave Leakage Protection Device

A magnetron cathode and protective device technology, applied in the field of magnetron, can solve the problems that the product cannot meet the electromagnetic compatibility standard, affect the normal operation of the control system, and affect the normal operation of the magnetron, so as to solve the problem of microwave leakage and avoid Creates hot spots for easy and full absorption

Inactive Publication Date: 2017-11-14
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these two structures have certain defects: for the λ / 4 choke sleeve, because the microwave generated by the magnetron has a certain discrete range, the condition of a quarter wavelength cannot be strictly satisfied, and when the choke sleeve When the microwave energy in the cylinder cannot be consumed in time (over its capacity), the microwave will also leak out
In fact, industrial high-power magnetrons often have microwaves coupled to the control cabinet through the cathode cable, which seriously affects the normal operation of the magnetron.
The commonly used emergency measures are: peel off a section of the shielding layer at the input end of the magnetron cathode cable, but there are defects in doing so. On the one hand, the microwave signal will radiate to the environmental space, causing electromagnetic pollution to the environment, and the product cannot meet the relevant electromagnetic requirements. Compatible with standards, on the other hand, the electromagnetic signal in the environmental space may also be coupled to the control cabinet through cables and holes, affecting the normal operation of the control system

Method used

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  • High Power Magnetron Cathode Cable Microwave Leakage Protection Device
  • High Power Magnetron Cathode Cable Microwave Leakage Protection Device
  • High Power Magnetron Cathode Cable Microwave Leakage Protection Device

Examples

Experimental program
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Effect test

Embodiment 1

[0027] This embodiment takes a 2.45GHz high-power magnetron cathode cable microwave leakage protection device as an example for illustration.

[0028] Such as figure 1 , 2 As shown, the magnetron cathode cable microwave leakage protection device in this example includes a sleeve 1, a connecting surface 2, an inner conductor 3, a short circuit 4, a resistive film 5, a ceramic insulating sheet 6 and a heat sink 7. In this example, the resistive thin film 5 is made of nickel-chromium alloy with a thickness of 0.02mm. In this example, the connection surface 2 is installed at the beginning of the sleeve 1, the short circuit 4 is installed at the end of the sleeve 1, and the ceramic insulating sheet 6 is installed between the inner conductor 3 and the short circuit 4, by figure 1 and figure 2 It can be seen that the cross-section of the sleeve in this example is circular, and the cooling fins 7 installed on the sleeve are installed at intervals along the axial direction of the s...

Embodiment 2

[0031] Such as image 3 , Figure 4 As shown, the heat dissipation device 7 of this example is a water-cooled box structure, forming a cylindrical annular airtight space along the outer surface of the sleeve 1, the lower left is the water inlet, and the upper right is the water outlet, so as to facilitate the heat generated during the microwave loss process. Distribute it in time. The heat dissipation device 7 of this example can be formed by welding the outer surface of the sleeve 1 with a hollow sleeve and metal sheets and copper sheets at both ends. The structure of the microwave leakage protection device for the cathode cable of the magnetron in this example is the same as that of Embodiment 1, and will not be repeated here.

[0032] Adopting the magnetron cathode cable microwave leakage protection device of the present invention replaces the design of the λ / 4 choke sleeve and the LC filter sleeve, reduces the design cost and the complexity of the system, and has the adv...

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Abstract

The invention discloses a microwave leakage protection device of a large-power magnetron cathode cable. The device adopts a coaxial transmission line and a true short road surface structure, and microwave can be strictly restricted in a coaxial line system to greatly lower microwave leakage. An even microwave transmission line and a resistive film are combined, the inner surface of a sleeve is coated with the resistive film so as to be favorable for effectively consuming leakage microwave power, improving heat dissipation efficiency and avoiding generating hot spots. By use of the microwave leakage protection device, the problem of microwave leakage generated by a cathode cable under a situation of magnetron frequency variation is effectively solved, the problem of the microwave space radiation of a common cathode LC filtering lead is effectively solved, cathode leakage microwave power is effectively consumed in time, and the microwave leakage protection device can be applied to the cathode microwave leakage protection of continuous wave, large power and long-time work, and can be used for the cathode microwave leakage protection of a frequency modulation magnetron (wide frequency band).

Description

technical field [0001] The invention relates to a magnetron, especially a microwave leakage protection device for a cathode cable of a high-power magnetron. Background technique [0002] Magnetrons are increasingly used in industrial, scientific and medical (IMS) research, and their fields of application continue to expand. Especially in industrial heating applications with the characteristics of continuous wave, high power, and long time, the microwave leakage of the magnetron will have a fatal impact on the control circuit. In addition, in order to ensure the long-term effective operation of electronic products and the electromagnetic protection of the environment, countries have formulated strict electromagnetic compatibility (EMC) standards for electronic products, so the electromagnetic compatibility (EMC) performance of magnetrons must be optimized. The leakage power of the cathode lead wire of the magnetron cannot be ignored. At present, there are two ways to deal w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J23/54
CPCH01J23/54
Inventor 熊祥正廖成叶志宏高明均罗杰郭晓东
Owner SOUTHWEST JIAOTONG UNIV
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