Roots blower mechanism, speed issue

The structure of the Roots blower has been discussed by the editor before. If you are interested, you can take a look. Additionally, what I want to talk about today is the issue of the rotational speed of the Roots blower.

2021-03-24

3.12 Arbor Day

Mingfeng Luoci Blower Manufacturer: Obviously, although the national conditions are different, the concept of "planting trees for the benefit of future generations" is consistent.

2021-03-12

How to adjust the belt of the Zhangqiu Roots blower?

The belt of the Roots blower is very important for the overall operation of the equipment. If it is too loose or too tight, it won't work properly. If necessary, it also needs to be adjusted. Below, we will share how to operate it with everyone from Mingfeng Blower Manufacturer!

2021-03-10

Introduction to the maintenance methods of Roots blowers!

Different devices need to be maintained and serviced. If problems arise, they need to be repaired promptly, and the methods vary depending on the specific issues.

2021-03-05

What lubricant is used for a Roots blower?

Regarding what lubricating oil to use for Roots blowers, many customers have asked this question. Today, the Mingfeng fan manufacturer will share with everyone!

2020-12-23

Manufacturer Sharing: Maintenance Issues of Roots Blower Filters

To ensure the smooth operation of a Roots blower, every link and part must be error-free. Components like filters are among those with relatively high wear and tear.

2020-12-23

Winter Solstice Supplementation Guidelines

Additionally, the following three types of people need to supplement their nutrition. Mingfeng Luoci Blower Manufacturer will share with everyone!

2020-12-21

The main medium of the Roots blower

The Roots blower conveys clean air, clean gas, sulfur dioxide, and other inert gases, making it the preferred product for special gas industries (such as gas, natural gas, biogas, carbon dioxide, sulfur dioxide, etc.) and high-pressure conditions. Given these characteristics, it can be widely adapted to the metallurgy, chemical, fertilizer, petrochemical, instrumentation, and building materials industries.  According to the shape of the rotor, Roots blowers are divided into two-lobe and three-lobe types. The three-lobe rotor performs three suction and discharge cycles with two rotors for each rotation. Compared to the two-lobe type, it has less gas pulsation, lower vibration, and lower noise.  The speed ranges from 150 to 3000 revolutions per minute. The flow rate is from 0.15 to 1200 cubic meters per minute, the pressure ranges from 9.8 to 196 kilopascals, and the power ranges from 0.75 to 1000 kilowatts, with a single machine weight of 100 to 9000 kilograms.  The most significant feature of the Roots blower is that when the pressure is adjusted within the allowable range, the flow variation is minimal, and the pressure selection range is very wide, with a characteristic of forced gas delivery. The medium conveyed is oil-free. It has a simple structure, easy maintenance, long service life, and low overall vibration.  Vacuum pump. Due to periodic suction and discharge and instantaneous isothermal compression, there is a pulsation of gas flow velocity and pressure, which generates significant gas dynamic noise. Additionally, the gaps between the rotors and between the rotor and the cylinder can cause gas leakage, thus reducing efficiency. The discharge volume ranges from 0.15 to 150 cubic meters per minute, with a speed of 150 to 3000 revolutions per minute. The single-stage compression ratio is usually less than 1.7, with a maximum of 2.1, and can be used in multi-stage series.  The Roots blower relies on the synchronous gears at the rotor shaft ends to keep the two rotors meshed. Each concave curved surface on the rotor forms a working volume with the inner wall of the cylinder, carrying gas from the intake port during the rotor's rotation. When it moves near the discharge port and connects with it, the pressure of the gas with higher pressure flows back, causing a sudden increase in pressure within the working volume, which then delivers the gas to the discharge channel. The two rotors do not contact each other; they achieve sealing through a precisely controlled gap, ensuring that the discharged gas is not contaminated by lubricating oil.

2019-09-19

Routine Maintenance and Care of Roots Blowers

Routine maintenance and upkeep of Roots blowers: 1. The blower should not be installed in areas frequently accessed by people to prevent injuries and burns. 2. The blower should not be installed in places where flammable, explosive, or corrosive gases may be present to prevent fires and poisoning accidents. 3. Adequate space should be left around the foundation according to the direction of the intake and exhaust ports and maintenance needs. 4. When installing the blower, check if the foundation is solid, the surface is level, and if the foundation is elevated above the ground. 5. When the blower is installed outdoors, a rain shelter should be set up. 6. The blower can be used for a long time in an environment with a temperature not exceeding 40°C. If it exceeds 40°C, cooling measures such as exhaust fans should be installed to extend the blower's lifespan. 7. When conveying air, the dust content should generally not exceed 100mg/m3. 8. Precautions for operation and use: (1) A comprehensive inspection of all components of the blower should be conducted, checking for completeness, the tightness of all bolts and nuts, the installation quality of all fasteners and locating pins, and the installation quality of the intake and exhaust pipelines and valves. (2) To ensure the safe operation of the blower, external loads such as pipelines, valves, and frames are not allowed. (3) Check the alignment and centering quality between the blower and the motor. (4) Check if the base of the unit is fully supported and if the anchor bolts are tightened. (5) Inject the specified grade of mechanical oil into the oil tank up to the oil level line, with the lubricant being N220 medium load gear oil. (6) Check if the motor's rotation direction meets the requirements. (7) A belt cover (guard) should be installed at the pulley (coupling) to ensure safe operation. (8) Fully open the intake and exhaust valves of the blower, rotate the blower rotor, which should turn smoothly without impact or friction. Only after confirming everything is normal can the blower be started for trial operation. 9. Empty load trial operation of the blower: (1) Newly installed or overhauled blowers should undergo empty load trial operation. (2) The concept of empty load operation for Roots blowers is: operating under the condition that the intake and exhaust valves are fully open. (3) There should be no abnormal odors, smoke, or sounds of collision or friction, and the radial vibration speed at the bearing should not exceed 6.3mm/s. (4) Run under empty load for about 30 minutes; if the situation is normal, it can be put into load operation. If any abnormal operation is found, it should be checked and rectified, and then another empty load trial operation should be conducted. 10. Normal load operation of the blower: (1) It is required to gradually and slowly adjust the load until reaching the rated load; it is not allowed to adjust directly to the rated load at once. (2) The so-called rated load refers to the static pressure difference between the intake and exhaust ports, according to the pressure value marked on the nameplate. Under normal exhaust pressure conditions, attention should be paid to changes in intake pressure to avoid overload. (3) During normal operation of the blower, it is strictly prohibited to completely close the intake and exhaust valves. Regular observation of pressure conditions is required, and whether the safety valve operates under overload; otherwise, the safety valve should be adjusted in time to prevent overload operation. (4) Due to the characteristics of Roots blowers, it is not allowed to let the exhaust gas flow back directly into the intake port for a long time (which changes the temperature of the intake port), as this will affect the safety of the machine. If backflow adjustment is necessary, cooling measures must be taken. (5) Regularly check the oil level position of the lubricant, conduct periodic inspections, and keep records to ensure oil quantity. 11. The blower should not be suddenly stopped under full load; it must gradually unload before stopping to avoid damaging the machine. Regarding emergency stop principles, users can formulate their own detailed rules. 12. The safe operation and lifespan of the blower depend on correct and regular maintenance and upkeep, and attention should be paid to any signs of accidents. In addition to general maintenance procedures, the following points should be emphasized: 1. Check the fastening conditions of each part and whether the locating pins are loose. 2. No oil leakage should be present inside the blower body. 3. There should be no scaling, rust, or peeling inside the blower body. 4. Pay attention to whether lubrication and heat dissipation are normal, check the quality of the lubricant, and regularly listen for any unusual sounds during blower operation. Ensure the unit is not operating under non-compliant conditions and regularly add grease. 5. Overloading of the blower may not be immediately apparent, so attention should be paid to the trends in intake and exhaust pressure, bearing temperature, and motor current to determine if the machine is operating normally. 6. Before disassembling the machine, measure the dimensions of each fit and keep records, marking the components to ensure that the original fit requirements are maintained after assembly. 7. For new machines or blowers after major repairs, the oil tank should be cleaned, and the operation should follow the usage steps. It is recommended to replace all lubricating oil after running for 8 hours. 8. Maintenance and repairs should be based on specific usage conditions to formulate a reasonable maintenance system, conducted periodically, and records should be kept. It is recommended to overhaul once a year and replace bearings and related wear parts. 9. Major repairs of the blower are recommended to be carried out by this company or professional maintenance personnel. Common faults and troubleshooting methods: 1. Friction between the impeller and the impeller: (1) Contaminants on the impeller cause the gap to be too small; remove the dirt and check for damage to internal components; (2) Gear wear causes large side gaps; adjust the gear gap. If the gear side gap is greater than 30%-50% of the average value, the gear should be replaced; (3) The gear is not securely fixed, failing to maintain synchronous operation of the impeller; reassemble the gear, ensuring that the contact area of the taper fit reaches 75%; (4) Bearing wear causes increased clearance. Replace the bearing. 2. Friction between the impeller and the wall plate, and between the top of the impeller and the casing: (1) Incorrect installation gap; readjust the gap; (2) Operating pressure is too high, exceeding the specified value; identify the cause of overload and reduce the pressure to the specified value; (3) Operating temperature is too high; check installation accuracy and reduce pipeline tension; (4) Deformation of the casing or base, causing failure of blower positioning; check and repair the bearing, ensuring clearance; (5) Poor axial positioning of the bearing. 3. Overheating: (1) Too much, too thick, or dirty oil in the oil tank; lower the oil level or remove excess oil; (2) Blockage in the filter or silencer; remove the blockage; (3) Pressure exceeds the specified value; reduce the pressure difference through the blower; (4) Excessive wear of the impeller, resulting in large gaps; repair the gaps; (5) Poor ventilation, high indoor temperature, causing high intake temperature; open ventilation openings to lower room temperature; (6) Operating speed too low, causing belt slippage. Increase the speed to prevent belt slippage. 4. Insufficient flow: (1) Blockage in the intake filter; remove dust and blockages from the filter; (2) Wear of the impeller, resulting in excessive gap; repair the gap; (3) Belt slippage; tighten the belt and increase the number of belts; (4) Large pressure loss at the intake; adjust the intake pressure to the specified value; (5) Leakage in the pipeline causing ventilation loss. Check and repair the pipeline. 5. Oil leakage or oil leaking into the casing: (1) The oil tank is too high, leaking from the oil outlet; lower the oil level; (2) Seal wear causing oil leakage at the shaft end; replace the seal; (3) Pressure exceeds the specified value; clear the ventilation openings, and install a valve with a 2mm aperture in the middle chamber, opening the valve below the wall plate; 6. Excessive current: (1) Voltage is too low; stop the blower operation and replace with a higher power motor if necessary; (2) Blockage in the filter or pipeline; clear the blockage; (3) Changes in gaps within the blower causing friction and collision; analyze the cause of gap changes and eliminate them, repairing the friction areas; (4) Excessive load; check the reasons for load exceeding standards and eliminate them, adjusting to rated load; (5) Motor failure; repair the motor, replacing it if necessary; 7. Abnormal vibrations or noises: (1) Bearing damage, excessive clearance; replace the bearing; (2) Foreign objects entering the impeller hole disrupting balance, or foreign objects stuck inside the blower; remove foreign objects and check for damage to the blower; (3) Overloading, overheating, etc., causing friction and collision inside the blower; eliminate factors causing abnormal operating conditions and check for any damaged components; (4) Misalignment of the coupling; adjust the coupling; (5) Belt tension too high or too low; adjust the belt tension; (6) Loose bolts at relevant connection points; tighten the connecting bolts.   Summary: Mingfeng Machinery - Professional manufacturer of Roots blowers and blowers! www.sdmingfeng.cn Consultation phone: Tel 0531-83208349

2019-09-19