Experimental Vacuum Freeze Dryer
The uses a physical principle to freeze the moisture in the compressed air below the dew point to precipitate it out of the air. Limited by the freezing point temperature of water, in practice its dew point temperature can be close to 0 degrees. The dew point temperature of a good experimental vacuum freeze dryer is usually about 5 degrees. The intuitive appearance of zui is that the refrigerant pressure gauge is zero.
The experimental vacuum freeze dryer leaks fluorine first to find the leak point. When checking the leak point, it needs patience and a certain way.
First use the visual method, open the machine box to look inside the machine, because the refrigerant will be mixed in the compressor when running, if the freon leaks will bring the smooth oil out, then carefully observe the inside of the machine, if there is The flaky oil stain belt is likely to be the leak point.
Then check the capillary copper tube inside the machine, that is, the thin copper tube and process tube below 6 mm, there is no break.
After passing the above basic review, mark the doubts. Then it is necessary to confirm the leak by adding an inert gas of a certain pressure. In the case of premise, zui is good to use nitrogen to maintain pressure, and there is no gaseous freon with nitrogen. It is strictly forbidden to check for leaks with oxygen.
When holding pressure, the starting end should be slowly involved in the gas. Observe the pressure of the refrigerant in the experimental vacuum freeze dryer while pressurizing. When the pressure is about 0.2Mpa, the pressure will be temporarily ended. Then carefully listen to the sound of the air leak inside the machine. You can find the leak by the location of the sound. If not, continue to pressurize to 0.4-0.5Mpa. Then find a sponge and apply soapy water, check in the place where you have doubts, and then check all the connections inside the machine. If there is a leak, there will be a bubble blowing out. This process needs to be very careful.
If the leak is still not found by the above method, it is likely that the evaporator is leaking. First of all, it must be confirmed that it can be confirmed by disconnecting the evaporator from the refrigeration system and then holding the pressure separately. If the pressure is reduced after the pressure is maintained by itself, it can be confirmed.
After finding the leak point of the experimental vacuum freeze dryer, it is trapped. According to the difference of the leak point, the leak point should be tightened accordingly. If it is a leak point of the copper tube welding type, brazing should be used. Brazing trapping is a common technique in the refrigeration repair industry. The so-called brazing is to use oxygen and acetylene flames to heat.
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