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Working principle of Roots blower Working principle diagram of SR three leaf Roots blower Gif animation

Source: Roots blower manufacturer Released on: November 23, 2021 Hits:

The working principle of Roots blower has been sorted out for everyone before. Now let's introduce the working principle and characteristics of SR three leaf Roots blower

Operating principle of Roots blower Operating principle of SR three blade Roots blower:

A constant volume rotary fan that uses two trilobal rotors to make relative movement in the cylinder to compress and transport gas.

This fan keeps the two rotors engaged by means of the synchronous gear at the rotor shaft end. Each concave curved surface on the rotor forms a working volume with the inner wall of the cylinder, and takes gas away from the suction port during rotor rotation;

When it is moved near the exhaust port and connected with the exhaust port, the gas is transmitted to the exhaust channel.

The two rotors work alternately in turn. The two rotors do not contact each other. They are sealed by a tightly controlled gap, so the discharged gas is not polluted by lubricating oil.

Structure diagram of Roots blower

Operating characteristics of Roots blower Operating characteristics of SR three blade Roots blower:

The gas has low pulsation, vibration and noise. This Roots blower is simple in structure, easy to manufacture and applicable

It is used for gas transmission and pressurization, and can also be used as a vacuum pump.
The following figure is Roots Blower Installed drawing
Working characteristics of Roots blower SR three leaf Roots blower Service conditions:
1. The working environment temperature of Roots blower shall not exceed 40 ℃. If it exceeds 40 ℃, measures shall be taken to reduce the temperature, otherwise
Short fan life. For outdoor configuration of Roots blower, please set a rain proof shed.
2. The foundation design shall comply with the relevant provisions of the national machinery and equipment installation engineering, and the foundation shall be built on hard soil,
It is 100-250 mm higher than the ground and 800-1500 mm deep. The bearing surface of the foundation should be 100-250 mm wider than the base
The foundation shall not be connected with other buildings and wall foundations. The foundation shall be firm. Enough space shall be reserved around Roots blower to
Meet the needs of maintenance and disassembly.
3. Before installation, remove the welding slag and other foreign matters in the pipeline, and place the valve in the fully open state, otherwise the roots blower will be overloaded
The machine is damaged.

Working characteristics of Roots blower Working principle of three blade roots blower

In the shutdown state, it can be added to the center of the oil window. Excessive oil filling will lead to oil leakage.
5. Check the tightness of the narrow V-belt and the belt pulley deviation. The belt pulley deviation can be adjusted with a ruler. When used for a period of time
The belt will become loose, and it should be readjusted at this time.
6. Check whether the power supply voltage and frequency meet the requirements of the nameplate.
7. Check the rotation direction of the belt pulley. Observe the rotation direction of the belt pulley when facing the belt pulley. The rotation direction of the belt pulley should be consistent with the rotation sign arrow.
※ YCSR50-300A pulley rotates counterclockwise, and 250B, 250C, 300B pulley rotates when facing the pulley
The direction is clockwise.
8. Before starting, manually rotate the belt pulley for more than 1 turn, check that the vent valve is fully open, and if there is no abnormality, start it
Move Roots blower.
Due to the adoption of the three blade rotor structure and the reasonable structure at the inlet and outlet of the housing, the fan has low vibration and noise.
The impeller and shaft are of integral structure, and the impeller is free of wear. The performance of the fan is permanent and can operate continuously for a long time.
The fan has large volume utilization rate, high volume efficiency, compact structure and flexible installation mode.
The selection of bearings is more reasonable, and the service life of each bearing is even, thus extending the life of the fan!
Operating characteristics of Roots blower SR three leaf Roots blower Machine fault analysis and solutions
1.　 Friction between Roots blower impeller and impeller
  1. The impeller is contaminated with impurities, resulting in too small clearance;
  2. Gear wear causes large backlash;
  3. The gear is not firmly fixed and cannot keep the impeller synchronized;
  4. The bearing wear causes the clearance to increase.
  5. Remove the dirt and check whether the internals are damaged;
  6. Adjust the gear clearance. If the gear backlash is greater than 30%~50% of the average value, replace the gear;
  7. Reassemble the gear and keep the taper fit contact area up to 75%;
  8. Replace the bearing;
two . Roots blower impeller and wallboard, impeller top and casing
  1. Incorrect installation clearance;
  2. The operating pressure is too high, exceeding the specified value;
  3. The operating temperature is too high;
  4. The casing or base is deformed, and the fan positioning is invalid;
  5. The axial positioning of the bearing is poor.
  6. Readjust the clearance;
  7. Find out the cause of overload and reduce the pressure to the specified value;
  8. Check the installation accuracy and reduce the pipeline tension;
  9. Check and repair the bearing and ensure the clearance.
3. The temperature of Roots blower is too high
(1) There is too much oil, too thick and dirty in the oil tank;
(2) The filter or muffler is blocked;
(3) The pressure is higher than the specified value;
(4) The impeller is excessively worn with large clearance;
(5) Poor ventilation and high indoor temperature cause high inlet temperature;
(6) The running speed is too low, and the belt slips.
(1) Lower the oil level or carry oil;
(2) Remove the blockage;
(3) Reduce the pressure difference through Roots blower;
(4) Repair clearance;
(5) Open vents to reduce room temperature;
(6) Increase the rotating speed to prevent the belt from slipping.

Working photo of Roots blower

4. Insufficient flow of Roots blower
(1) Inlet filtration is blocked;
(2) The impeller is worn and the clearance increases too much;
(3) Belt slipping;
(4) Large inlet pressure loss;
(5) The pipeline causes ventilation leakage.
(1) Remove the dust and blockage of the filter;
(2) Repair clearance;
(3) Tighten the belt and increase the number of belts;

(4) Adjust the inlet pressure to the specified value;

5. Roots blower leaks oil or oil leaks into the casing

(1) The oil tank is high and leaks out from the oil drain;
(2) The seal is worn, causing oil leakage at the shaft end;
(3) The pressure is higher than the specified value;
(4) The air vents of the wallboard and oil tank are blocked, causing oil leakage into the casing.
(1) Lower the oil level;
(2) Replace the seal;

(3) Dredge the vent, install a cock with 2mm aperture in the middle chamber, and open the cock under the wallboard;

6. Stop the Roots blower immediately due to abnormal vibration and noise

(1) The clearance of rolling bearing exceeds the specified value or the bearing seat is worn;
(2) The gear backlash is too large, misaligned, and not tightly fixed;
(3) Impellers collide with impellers and impellers collide with casings due to foreign objects and dust;
(4) Impeller collision due to overload and shaft deformation;
(5) Friction between impeller and casing inlet due to overheating;
(6) The impeller loses balance due to scale or foreign matters;
(7) Anchor bolts and other fasteners are loose.
(1) Replace the bearing or bearing seat;
(2) Reassemble the gear and ensure the backlash;
(3) Clean Roots blower and check whether the casing is damaged;
(4) Check the back pressure, check whether the impeller is aligned, and adjust the clearance;
(5) Check the filter and back pressure, and increase the clearance between the impeller and the casing inlet;
(6) Clean the impeller and casing to ensure the working clearance of the impeller;

(7) Tighten the foundation bolts and level the base.

7. Roots blower motor overload

(1) Compared with the specified pressure, the pressure difference is large, that is, the back pressure or inlet pressure is high;
(2) Compared with the flow required by the equipment, the flow of Roots machine is too large, so the pressure increases;
(3) The inlet filtration is blocked, and the outlet pipeline is blocked or blocked;
(4) Collision and friction (seizure) of rotating parts;
(5) The oil level is too high;
(6) The narrow V-belt is overheated, the vibration is too large, and the pulley is too small.
(1) Reduce the pressure to the specified value;
(2) Put the excess gas into the atmosphere or reduce the rotating speed of Roots blower;
(3) Remove obstacles;
(4) Stop the machine immediately and check the cause;
(5) Adjust the oil level to the correct position;
(6) Check the belt tension and replace it with a large diameter pulley.
Energy saving of Roots blower: the wind pressure of Roots blower is not limited by the fan speed, and the wind pressure can remain unchanged no matter how the speed changes. The air volume is proportional to the rotating speed of Roots blower, i.e. Q=KN
Q: Represent the air volume N: Represent the rotating speed of Roots blower K: Represent the coefficient
It can be seen from the formula that the air volume regulation is achieved by changing the motor frequency completely by the frequency converter to achieve stepless speed change, which has the effect of adjusting the air volume. According to the field application process, the low frequency of Roots blower is 15HZ, which is usually about 35HZ. In some cases, 50HZ operates with full air volume. Because the vertical kiln process is basically the same, the air volume adjustment amount in different vertical kilns is basically the same. Every vertical kiln using frequency conversion technology can achieve about 40% energy saving effect.
Roots blower of roots drum has constant torque load, and its power saving rate is in direct proportion to the speed drop, that is, N%=△ N%. Although it is different from general roots blower and water pump, its power saving rate is higher, and as long as the furnace wall is not damaged, it works continuously for 24 hours, and the starting time is also very long. Therefore, there is great potential for power saving and high cost of power saving.