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Portable liquid nitrogen filling device with automatic stopping function for high-purity germanium detector

A high-purity germanium detector, automatic stop technology, applied in the container filling method, container discharge method, equipment loaded into the pressure vessel, etc., can solve the problems of personnel on-site duty, etc., to achieve convenient connection, not easy to block, compact structure Effect

Active Publication Date: 2014-04-23
NORTHWEST INST OF NUCLEAR TECH
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  • Abstract
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Problems solved by technology

[0008] The invention designs a portable high-purity germanium detector liquid nitrogen filling device with automatic stop function, which is suitable for routine liquid nitrogen filling of many HPGe detectors placed in different experimental rooms, and solves the liquid nitrogen filling process Technical problems of on-site duty of middle-level personnel

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  • Portable liquid nitrogen filling device with automatic stopping function for high-purity germanium detector

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Embodiment Construction

[0034] A portable HPGe detector liquid nitrogen filling device with automatic stop function, which is composed of three units: automatic control, temperature measurement and liquid nitrogen filling;

[0035] The automatic control unit is composed of 220V power supply L phase 1, 220V power supply N phase 2, start button 3, iron core 4, KM coil 5, KM1 contact 6, KM2 contact 10, KM3 contact 11 and solenoid valve 14 to realize liquid Nitrogen filling, automatic stop when overflowing, and solenoid valve opening and closing functions;

[0036] The temperature measurement unit is composed of a Pt100 platinum resistance sensor 8 and a temperature controller 7, which realizes the monitoring of the temperature at the exhaust pipe of the Dewar tank and the cut-off function of the working voltage of the AC contactor;

[0037] The filling unit is composed of an air compressor 12, an oil-water separator 13 and a liquid nitrogen pump 30 to realize the filling function of liquid nitrogen.

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Abstract

The invention discloses a portable liquid nitrogen filling device with an automatic stopping function for a high-purity germanium detector. The portable liquid nitrogen filling device comprises a temperature measuring unit, an automatic control unit and a liquid nitrogen filling unit, wherein the automatic control unit comprises a 220V power supply, a start button, an alternating-current contactor, a temperature controller and an electromagnetic valve; the electromagnetic valve is arranged on an exhaust pipe of a liquid nitrogen pump; the two input ends of the electromagnetic valve are connected with an L phase and an N phase of the 220V power supply respectively through a contact KM2 and a contact KM3 of the alternating-current contactor; the electromagnetic valve is in a shut-down state when the output voltages of the contact KM2and the contact KM3 are switched on and is in a turn-on state when the voltages are switched off. By adopting the portable liquid nitrogen filling device, a temperature monitoring function is realized, the liquid nitrogen pump stops automatically when a Dewar tank is full of liquid nitrogen and the automatic control unit is irreversible when the temperature is higher than a set threshold value, so that the function of unattended operation is realized in a liquid nitrogen filling process.

Description

technical field [0001] The invention clearly belongs to the technical field of nuclear radiation high-purity germanium (HPGe) gamma energy spectrum detector maintenance, and specifically relates to a portable HPGe detector liquid nitrogen filling device with an automatic stop function. Background technique [0002] High-purity germanium (HPGe) detectors have been widely used in gamma spectrum testing in scientific research, industrial and agricultural production, and environmental radioactivity due to their good energy resolution and other characteristics. Due to the low bandgap width of germanium crystals, in order to reduce the leakage current noise generated by molecular thermal motion, liquid nitrogen is often used as a coolant to provide the required low temperature environment for the normal operation of HPGe detectors. Supplementing liquid nitrogen in the crock is an essential routine work. Liquid nitrogen is transported from the transport turnover container to the D...

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Application Information

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IPC IPC(8): F17C5/04F17C13/02F17C13/00
Inventor 张小林李雪松余功硕解峰何小兵姜文刚
Owner NORTHWEST INST OF NUCLEAR TECH
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