Common faults and solutions such as inability to achieve vacuum degree in vacuum furnaces

During the use of vacuum furnaces, it is common to encounter faults such as inability to draw vacuum. Let’s take a look at common faults and solutions of vacuum furnaces below!

Commonly used vacuum furnaces (click on the image to view product details)

1. Vacuum degree cannot be drawn or low vacuum degree
Vacuum pump malfunction
Possible reasons: pump oil contamination, insufficient or too thin, poor or damaged vacuum pump operation, pump overheating, mechanical expansion leading to small gaps, improper cleaning causing debris to enter the oil.
Solution: Clean the vacuum pump, replace with new vacuum pump oil, replace with a new pump, strengthen the cooling of the pump, check if the power supply is normal, repair or replace damaged vacuum pump parts.

leak
Possible reasons: aging, corrosion, or damage of seals, loose connections at pipeline joints, air leakage from solenoid valves, pipe joints, vacuum pump suction valves, and sealing gaskets around the working chamber.
Solution: Check and replace aging or broken seals to ensure good sealing, inspect pipeline connections, solenoid valves, pipe joints, etc., and repair or replace them.

Insufficient pumping time
Solution: Extend the pumping time.

The exhaust filter is clogged
Solution: Clean or replace the exhaust filter.

Valve malfunction
Possible reasons: malfunction of solenoid valve, aging or damage of valve.
Solution: Repair or replace the valve.

2. Abnormal heating
Heating element malfunction
Possible reasons: aging, damage, or poor contact of heating elements, burning of heating strips, and burning of heating wires.
Solution: Check the connection and resistance of the heating element, repair or replace the damaged heating element.

Temperature controller malfunction
Possible reasons: Damaged or improperly set temperature controller, broken or short circuited thermocouple wires, temperature control instrument malfunction.
Solution: Check and adjust the settings of the thermostat, replace or reconnect the thermocouple, and repair the control system.

Control system malfunction
Possible reasons: damage or poor contact of the power supply circuit of the control system, damage or aging of internal components of the control system, software malfunction.
Solution: Check the power supply circuit of the control system to ensure that the power supply is normal; Check and replace damaged components inside the control system; Update or reinstall control system software.

Power supply voltage fluctuation
Solution: Ensure stable power supply voltage, and install a voltage regulator if necessary.

3. Other faults
Vacuum pump fuel injection
Possible cause: The O-ring of the suction valve has come off.
Solution: Remove the vacuum tube from the pump nozzle, remove the suction nozzle, take out the compression spring and suction valve, gently stretch the O-ring several times, re insert it into the groove, and then install it.

Vacuum pump oil leakage
Possible cause: clogged return valve.
Solution: Remove the return valve and clean it.

Loose oil window
Solution: After draining the oil, remove the oil window and wrap it with raw material tape or thin plastic film.

Insufficient supply of cooling water
Solution: Check if the cooling water pipeline is unobstructed, ensure sufficient cooling water supply, and clean any blockages.

Motor reverse time is too long
Solution: Swap and install any two-phase power lines (except for the ground wire).

Poor ventilation in the pressurized air path
Solution: Streamline and unblock the pressurized air path.

4. Maintenance suggestions
Regular cleaning: Clean the dust and oil stains inside the vacuum furnace to maintain cleanliness and hygiene.
Regularly replace vulnerable parts: Check and maintain mechanical equipment. If aging or damage is found in vulnerable parts such as cylinder seals and heat-resistant seals, they should be replaced in a timely manner.
Fault record: Record the faults of the vacuum furnace, including the symptoms, causes, and solutions, in order to facilitate future maintenance work and fault diagnosis.

Industrial vacuum furnace (click on the image to view product details)

In general, when a vacuum furnace encounters common faults such as inability to draw vacuum during use, it should be investigated and resolved according to the specific situation. If you encounter an unsolvable fault, you can find the nameplate on the back of the equipment and contact the original manufacturer to consult technical personnel for solution or repair. At the same time, regular maintenance and upkeep are also key to ensuring the normal operation and extending the service life of the vacuum furnace.Click to learn more vacuum furnaces! Or click on online customer service to learn more about product information!