What is the reason for insufficient vacuum degree in a vacuum tube furnace?

Insufficient vacuum degree in vacuum tube furnaces may be caused by various factors. The following are some common reasons and solutions:
1. Vacuum system leakage
reason:
There is a leak in the vacuum furnace body or vacuum pipeline.
The sealing ring or dynamic seal between each component leaks.
The furnace seal is poor and there is a lot of air leakage.
resolvent:
Conduct an airtight test on the vacuum furnace and vacuum pipelines, inspect and repair any leaks.
Check if the sealing rings between each component are intact, and replace them if damaged.
Strengthen the sealing of the furnace to ensure there are no leakage points.
2. Insufficient pumping capacity of vacuum pump
reason:
Vacuum pump failure, such as low pumping rate or low vacuum degree of mechanical pump.
Vacuum pump oil contamination or nozzle blockage affects pumping efficiency.
resolvent:
Check the operation of the vacuum pump to ensure its normal functioning.
Clean or replace the vacuum pump oil to maintain its cleanliness.
Clean the nozzle inside the vacuum pump to prevent blockage.
3. Volatile materials inside the furnace
reason:
The materials inside the furnace evaporate at high temperatures, releasing a large amount of gas.
resolvent:
Pre treat the material before heating to reduce its volatility.
Adjust the heating process to avoid rapid evaporation of materials at high temperatures.
4. Other factors
Control system malfunction: Check the connection and resistance of the heating element, repair or replace damaged heating elements, and inspect and calibrate the control system.
Thermocouple issue: The disconnection or short circuit of the thermocouple wire may also affect the measurement and control of vacuum degree, and the thermocouple needs to be replaced or reconnected.
Cooling system issue: Insufficient cooling water supply or blockage of the cooling system may also affect the efficiency of the vacuum pump. It is necessary to check whether the cooling water pipeline is unobstructed, ensure sufficient cooling water supply, and clean the blockage.
5. Maintenance and inspection
Regular inspection: Regularly maintain and inspect the vacuum system of the vacuum tube furnace to ensure the normal operation of all components.
Replace seals: After a period of use, if the vacuum level decreases, the heat-resistant silicone ring between the stainless steel flanges can be replaced or the stainless steel flanges can be reinstalled to improve the overall vacuum level of the system.
Pay attention to usage details: During use, be careful to avoid pouring various liquids and dissolved metals directly into the furnace to keep it clean. At the same time, it is necessary to regularly check whether the electrical connection of the temperature control system is in good contact, especially paying attention to whether the connection points of the heating element are tightly connected.
In summary, the reasons for insufficient vacuum degree in vacuum tube furnaces may involve multiple aspects such as air leakage in the vacuum system, insufficient pumping capacity of the vacuum pump, and volatilization of materials inside the furnace. When solving such problems, it is necessary to comprehensively consider various factors and take corresponding measures to ensure the stability and improvement of vacuum degree.