Introduction to sealing principle of Roots blower and removal steps of mechanical seal

The sealing principle of Roots blower and the removal steps of mechanical seal are introduced. Xinqian Shun blower introduces the sealing principle of Roots blower, the removal steps of mechanical seal and the preparations to be made before the removal of seal

Regular inspection method of Roots blower:

1、 Daily inspection

1. Check the oil level. Too much or too little lubricating oil will damage the bearing.

2. Check the temperature of main and auxiliary oil and bearing parts.

3. Check the suction and discharge pressure to confirm whether the fan operates normally.

4. Check the motor load. If the motor load increases, it indicates that there is some abnormal condition, and the reason should be found out.

5. Check the sealing effect of packing.

2、 Three month inspection. Replace the oil in the main oil tank and clean the air filter.

3、 Half year inspection. Replace the lubricating oil in the auxiliary oil tank and check the fan pipe support. The packing seal fan shall be checked for seal leakage.

4、 One year inspection

1. Check the rotary shaft lip seal ring.

2. Check the impeller and the inside of the casing, and check the clearance of each part.

3. Check the gear.

Sealing principle of Roots blower:

When the mechanical seal of Roots blower works, the pressure of the sealing fluid and the elasticity of the elastic element bow the axial force to make the moving ring and the stationary ring stick to each other and move relatively. Due to the close cooperation of the two sealing end faces, a small gap is formed at the junction between the sealing end faces. When the pressurized medium passes through this gap, an extremely thin liquid film is formed, producing resistance, Prevent medium leakage, and at the same time, the liquid film lubricates the end face to obtain long-term sealing effect.

Removal steps of mechanical seal of Roots blower:

1. Before disassembly, the mechanical seal shall be subject to pressure test (test pressure 1kg) to confirm whether there is leakage, record the leakage data and confirm the quantity of replacement.

2. Remove the special support of the mechanical seal from the rack and install it on the mechanical seal.

3. Remove fixing screws.

4. Evenly eject the mechanical seal, and mark the installation position.

Preparations for removing Roots blower mechanical seal:

1. Check whether the model and specification of the mechanical seal meet the requirements of the design drawings, and whether all parts (especially the sealing surface and auxiliary sealing ring) are damaged, deformed, cracked, etc. If there are defects, replace or repair them.

2. Check whether the matching size, roughness and parallelism of all parts of the mechanical seal meet the design requirements.

3. When Roots blower uses small spring mechanical seal, check whether the length and rigidity of the small spring are the same.

4. Check whether the displacement, swing and deflection of the main engine meet the technical requirements, whether the seal chamber meets the installation dimensions, and whether the seal end cover is vertical to the shaft. The general requirements are: the shaft displacement is not greater than or equal to 0.5ram, the shaft swing at the rotating ring seal ring is not greater than 0.06mm, and the larger shaft deflection is not greater than 0.05mm The allowable deviation of non perpendicularity between the contact plane of seal end cover and gasket and the middle line is 0.03-0.05mm.

5. Roots blower shall be kept clean, especially the sealing surface of rotating ring, stationary ring and auxiliary sealing ring shall be free of impurities. Do not wipe the sealing surface with unclean cloth.

6. It is not allowed to knock the sealing elements with tools to prevent the sealing elements from being damaged.