How can helium mass spectrometer leak detector be applied to leak detection of heat pipe radiators?

Why do heat pipes need to be leak tested? Reasons for leak detection of heat pipes:

Fill the heat pipe with special liquid to improve thermal conductivity. If there is a leakage point in the heat pipe itself, it will first affect the thermal conductivity of the heat pipe; Secondly, due to the installation of heat pipes inside the equipment, if there is a leak, the packaged liquid will flow out, causing serious pollution and affecting the normal operation of the equipment. Therefore, heat pipe manufacturers will use helium mass spectrometry leak detectors to detect leaks in heat pipes.

Heat pipe leak detection method:

The standard leakage rate qualification line for a certain enterprise’s heat pipe before leaving the factory is E-8 mbarl/s. When using a helium mass spectrometer leak detector for leak detection, E-8 is set as the alarm value. When the leakage rate is lower than this value, the product is qualified. When the leakage rate is higher than this value, the leak detector emits an audible and visual alarm, indicating that the product is leaking.

The heat pipe adopts the vacuum leak detection mode of a leak detector, as the product does not have a standard interface for vacuum pumping. A vacuum fixture is customized according to the customer’s actual situation, with one end connected to the leak detector and the other end connected to the product. The specific method is as follows:

1. Start the helium mass spectrometer leak detector and install the fixture;

2. Insert the heat pipe into the fixture and seal it with vacuum sealing mud;

3. Press the start button of the leak detector to start vacuuming;

4. Spray helium around the product, with E-8 mbarl/s as the qualified line.

The helium mass spectrometer leak detector is a specialized leak detection instrument that uses helium gas as the indicator gas. It has the characteristics of stable performance and high sensitivity. It is the most sensitive and commonly used leak detection instrument in vacuum leak detection technology.

The helium mass spectrometer leak detector is a mass spectrometer with magnetic bias transformation. The sensitivity of the single-stage magnetic bias transformation instrument is between lO-9 and 10-12 Pam3/s, and it is widely used for leak detection in various vacuum systems and components.

Compared with single-stage magnetic bias conversion instruments, the background noise of the two-stage series magnetic bias conversion instrument is significantly reduced. Its sensitivity can reach 10-14~10-15 Pa m3/s, which is suitable for leak detection in ultra-high vacuum systems, components, and components.

The countercurrent helium mass spectrometer leak detector has changed the structural layout of traditional instruments, with the tested piece placed in the front of the main pump of the leak detector, featuring high-pressure leak detection, no liquid nitrogen, and low contamination in the mass spectrometry chamber.

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