Common faults and solutions of industrial vacuum heat treatment furnaces
05-08-2025 Author: KJ technology
The common faults and solutions of industrial vacuum heat treatment furnaces are as follows:
1. Insufficient vacuum degree
Possible reasons:
Vacuum pump malfunction or performance degradation: internal wear of the vacuum pump, insufficient or contaminated lubricating oil, foreign objects entering, etc.
Vacuum pipeline leakage: Poor sealing at the pipeline connection, with leakage points present.
Aging or damage of seals: Seals such as furnace door seals and O-rings are aging, hardening, or damaged.
There are residual gases or pollutants in the furnace body or pipeline: materials inside the furnace evaporate or react to produce by-products, which have not been thoroughly cleaned.
resolvent:
Check the vacuum pump: regularly replace the pump oil, clean the filter screen, and check whether the rotating parts are flexible. If the pump performance cannot be restored, the vacuum pump needs to be repaired or replaced.
Repair leakage point: Use a leak detector to detect the vacuum pipeline and repair the leaking area.
Replace seals: Regularly inspect and replace aging or damaged seals to ensure that the locking device is evenly stressed when the furnace door is closed.
Thoroughly clean the furnace body: remove residues and pollutants to prevent affecting the vacuum degree.
2. Uneven heating
Possible reasons:
Heating element damage or aging: Heating element breakage, detachment, or surface oxidation.
Temperature sensor malfunction or incorrect position: poor contact or incorrect installation position of thermocouple.
Damaged or improperly arranged heat shield: The heat shield is deformed or positioned improperly, resulting in uneven heat distribution.
resolvent:
Check heating elements: Regularly check the integrity of heating elements, replace damaged or aged elements, ensure secure fixation, and reserve expansion space.
Calibrate or replace temperature sensor: Check the working status of the thermocouple to ensure that it is in the correct position and functioning properly, and calibrate or replace it if necessary.
Repair or rearrange heat shield: Check the condition of the heat shield, repair deformed or damaged parts, and ensure uniform heat distribution.
3. Temperature control malfunction
Possible reasons:
Temperature controller malfunction: Temperature controller parameter setting error or internal damage.
Temperature sensor malfunction: The thermocouple or thermistor is damaged, resulting in inaccurate temperature measurement.
Control circuit failure: damage or poor contact of electrical components such as solid-state relays and contactors.
resolvent:
Calibration or replacement of thermostat: Check the parameter settings of the thermostat and calibrate or replace it if necessary.
Replace temperature sensor: If the thermocouple or thermistor is damaged, it should be replaced in a timely manner and ensure that the installation position is correct.
Repair control circuit: Check electrical components such as solid-state relays and contactors, and repair or replace faulty parts.
4. Internal pollution of furnace body
Possible reasons:
Unclean residues during use: residual volatiles or reaction by-products from the workpiece in the furnace.
Material volatilization or reaction generates by-products: At high temperatures, material volatilization or reaction generates pollutants.
Poor sealing of furnace body: External pollutants enter the furnace through the poorly sealed area.
resolvent:
Regularly clean the furnace body: remove residues and pollutants, and keep the furnace clean.
Use appropriate materials: Avoid materials that produce volatile or reaction by-products at high temperatures.
Ensure the sealing of the furnace body: Check the condition of the seals and replace aged or damaged seals if necessary.
5. Abnormal noise from vacuum pump
Possible reasons:
Internal wear or damage of vacuum pump: wear of pump body, blades and other components.
Insufficient or contaminated lubricating oil: Insufficient or contaminated lubricating oil in the pump.
Foreign objects enter the interior of the vacuum pump: foreign objects enter the pump, causing abnormal operation.
resolvent:
Inspect the interior of the vacuum pump: Regularly check the pump body, blades, and other components, repair or replace damaged parts.
Replace lubricating oil: Regularly replace the vacuum pump oil to ensure that the oil level is within the normal range.
Cleaning the interior of the vacuum pump: Check and clean any foreign objects inside the pump to ensure unobstructed normal operation.
6. The furnace door cannot be opened or closed normally
Possible reasons:
Aging or damage of furnace door sealing ring: The sealing ring is aging, hardened or damaged.
Mechanical component failure of furnace door: damage or deformation of mechanical components such as hinges and clasps.
Mismatch between furnace door sealing ring and furnace body: The sealing ring does not match the size of the furnace body, resulting in poor sealing.
resolvent:
Replace sealing rings: Regularly inspect and replace aging or damaged sealing rings.
Repair the mechanical components of the furnace door: Check and repair the hinges, buckles, and other mechanical components to ensure the normal operation of the furnace door.
Adjust the matching degree between the sealing ring and the furnace body: Ensure that the sealing ring matches the size of the furnace body, and adjust it if necessary.
7. Cooling system malfunction
Possible reasons:
Blockage of cooling water circuit: Blockage of cooling water pipeline leads to poor water flow.
Pump malfunction: The pump is damaged or inefficient, resulting in insufficient cooling water supply.
Cooler damage: Internal damage to the cooler affects cooling efficiency.
resolvent:
Clean the cooling water circuit: Regularly inspect and clean the cooling water pipeline to ensure smooth water flow.
Repair or replace water pump: Check the working status of the water pump, repair or replace the faulty water pump.
Repair or replace the cooler: Check the condition of the cooler and repair or replace damaged parts.
