How to Achieve Better Operation of Roots Blowers? (Recommended Normal Operation: Switch Once Every 24 Hours – 7 Days, Control System Settings)
Regarding Oil:
Generally, blowers delivered from our factory have undergone 5 necessary inspection and commissioning procedures, with a total test run time of approximately 12-15 hours. After delivery, it is recommended that users replace the oil for the first time after 500 hours of operation (running-in period). Since the Roots blowers manufactured by our factory adopt a double-oil-tank structure, the oil in both oil tanks should be replaced simultaneously. The specified oil grade is 220# industrial heavy-duty gear oil.
Under normal circumstances, it is recommended to replace the lubricating oil every 3 months. (Even if the blower is used infrequently or not used at all within 3 months, oil replacement is still required, considering factors such as oil deterioration.) If synthetic oil is used (with higher cost), the replacement interval can be extended to 6 months. If the oil is found to be excessively dirty (with a large amount of impurities such as sediments) when checking the oil sight glass, the oil must be replaced in advance.
To replace the oil: Open the oil drain plug at the bottom to drain the oil tank completely. After closing the oil drain plug, open the oil filling cap at the top to add new oil.
Note:
If the previously used Roots blower has a single-oil-tank structure, the oil replacement method for the drive end is the same as the one specified above. For the gear end, it is necessary to add grease regularly (every 20 days to 1 month).
The addition method is as follows: Open the oil cap at the top of the blower head, squeeze grease into the head, and at the same time rotate the belt or pulley to ensure that the grease is evenly applied to the gears inside the end cover.
Common Faults, Abnormal Causes and Troubleshooting Methods of Roots Blowers
Regarding Drive Belts:
If there is a relatively sharp, harsh noise at the drive end of the machine, a dull vibration noise during the main unit operation, or if excessive belt vibration is observed, these issues are basically caused by severe belt wear or belt slack due to long-term stress. Replacing the belt will resolve the problem.
Regarding Failure to Start:
This situation rarely occurs with conventional motors; it usually happens with variable-frequency motors or motors equipped with frequency converters. A common scenario is when an engineering project is equipped with 3 blowers (2 in use, 1 standby). When switching between blowers, it is easy to encounter a situation where one blower shuts down but the other fails to start. This fault is caused by insufficient torque of the frequency converter, which prevents startup and is also called "overcurrent". The general troubleshooting method is to increase the torque setting of the frequency converter to resolve the issue.
Regarding Overpressure and Overcurrent Display After Startup:
The fault manifests as the pressure gauge reading exceeding the estimated value after startup. In most cases, this is caused by solid sediments and impurities in the tank, which lead to an instantaneous excessive pressure upon startup. Simply keeping the blower running will alleviate or eliminate the problem, with the duration ranging from as short as 5 minutes to as long as 1 hour.
Regarding Abnormal Noise from the Blower Head:
If abnormal noises such as friction or collision are heard from the blower head, immediately stop the machine operation. Since the internal structure of the blower head is relatively complex, there are many factors that can cause abnormal noises. It is recommended to use the elimination method for diagnosis:
First, drain the oil from the drive end and gear end completely.
Then, disassemble the end covers on both sides to check if the gears and bearings are worn. (If wear occurs, it is generally caused by insufficient oil supply/oil cut-off or excessive impurities in the oil.)
If no wear is found on the gears and bearings, disassemble the main blower head, rotate the impellers, and check if the impellers come into contact with the cylinder during rotation. Roots blower impellers have a very small gap with the cylinder and should not touch the cylinder during normal operation. If contact occurs, it indicates that impurities in the cylinder have caused wear to the impellers and cylinder (this is usually due to failure to clean the air intake filter in a timely manner, allowing impurities to enter the cylinder).
Note: If abnormal noise occurs from the blower head, it is recommended to contact the manufacturer directly, communicate the specific situation clearly, and then make a plan. Try not to disassemble the blower head without authorization, as the disassembly and assembly of the blower head require extremely high precision. There will be a significant difference in the assembly quality of the same parts between a novice and an experienced technician, which will largely affect the service life of the blower.
Regarding Normal Blower Startup But No Aeration Bubbles in the Aeration Tank, and Low or No Pressure on the Pressure Gauge:
When encountering this situation, follow these steps for inspection:
First, confirm that the blower is operating normally.
Then, check the entire blower for gas leaks, focusing on whether there is gas escaping from the pressure relief valve.
If no gas is discharged from the entire blower or the pressure relief valve, there is a 99.99% chance of a pipeline problem. Check for damage or disconnection in the pipeline from the blower's air outlet to the end of the aeration pipeline. Sometimes the damage may not be in the tank but in the part of the pipeline exposed to the air.
Regarding Air Filters:
It is recommended to clean the air filter once a month. Open the hand-tightened screws, remove the air filter end cover, take out the adsorption sponge, and use an air gun to blow off the adsorbed substances on it.
If the air filter has been used for more than 1 year, it is recommended to replace it directly.
Roots blowers rarely experience faults if they are made of high-quality materials and assembled properly. The above lists some common faults and corresponding solutions. If you encounter other problems during use, you are welcome to contact the JUNTAI Team directly.