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The bearing sleeve of a vacuum pump is a key component to ensure stable operation of the vacuum pump. Its use requires attention to material selection, installation accuracy, lubrication maintenance, operation monitoring, environmental adaptation, and regular replacement. The following are detailed usage precautions:

1. Material selection and adaptability

Corrosion resistance

Vacuum pumps may come into contact with corrosive gases (such as chlorine and ammonia) or liquids, and the shaft sleeve material needs to have high corrosion resistance. Recommended materials: stainless steel (such as 316L), ceramics (such as alumina, silicon nitride), or special alloys (such as Hastelloy), avoid using ordinary carbon steel or easily corrosive materials.

Wear resistance

The shaft sleeve frequently rubs against the shaft neck, and it is necessary to choose materials with strong wear resistance to reduce wear.

. Recommended materials: self-lubricating composite materials (such as PTFE+fillers), bronze alloys (such as tin bronze), or hard alloy coatings.

Temperature adaptability

Select materials based on the working temperature of the vacuum pump. High temperature environments should use high-temperature resistant materials (such as high-temperature alloys and ceramics), while low-temperature environments should avoid material embrittlement.

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II. Installation and Assembly Specification

Cleanliness

Thoroughly clean the shaft sleeve, journal, and bearing seat before installation, remove oil stains, iron filings, and other impurities to prevent particles from embedding and causing wear or jamming.

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Operation suggestion: Use a dust-free cloth to wipe, and if necessary, clean with alcohol or specialized cleaning agents.

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Fit clearance

The fit clearance between the shaft sleeve and the journal must meet the design requirements. A too small clearance can cause overheating or jamming, while a too large clearance can cause vibration and noise.

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Reference standard: Select H7/f6 or H8/f7 fitting tolerance based on shaft diameter and speed, refer to the equipment manual for details.

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Coaxiality and perpendicularity

Ensure that the shaft sleeve is coaxial with the bearing seat after installation, and the end face is perpendicular to the axis to avoid local wear caused by unbalanced load.

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Detection method: Use a dial gauge or laser centering instrument to detect coaxiality, with an error controlled within 0.05mm.

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Avoid forcefully striking

Do not use hammering during installation to prevent deformation or damage to the shaft sleeve.

. Special press fit tools or heating expansion methods (such as induction heating) should be used for assembly.

III. Lubrication and Cooling Management

Lubrication Method Selection

Oil Lubrication: Suitable for high-speed or high-temperature environments, it is necessary to regularly replace the lubricating oil and maintain the normal oil level.

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Lubricating grease: Suitable for low-speed or high sealing requirements, high-temperature and corrosion-resistant lubricating grease (such as fluorocarbon grease) should be selected.

. Self lubrication: Some shaft sleeves use solid lubricants (such as graphite, molybdenum disulfide) or oil containing materials, and their applicable working conditions need to be confirmed.

Lubrication cycle

Develop a lubrication plan based on operating time or mileage, and shorten the lubrication cycle for frequent start stop or heavy load conditions.

. Example: Add lubricating grease every 2000 hours of operation or 3 months.

Cooling measures

Under high temperature conditions, forced cooling (such as water or air cooling) is required to prevent changes in the gap or material properties of the shaft sleeve due to thermal expansion.

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IV. Operation Monitoring and Maintenance

Temperature Monitoring

Regularly check the temperature of the shaft sleeve. Abnormal increases (such as exceeding 80 ℃) may indicate insufficient lubrication, small clearance, or excessive load.

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Tool: Infrared thermometer or temperature sensor.

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Vibration and Noise Analysis

Abnormal vibration or noise may be caused by wear, misalignment, or looseness of the shaft sleeve, and it is necessary to stop the machine for inspection in a timely manner.

. Tools: vibration analyzer or stethoscope.

Leakage Inspection

If there is a dynamic seal (such as an O-ring) between the shaft sleeve and the shaft neck, it is necessary to regularly check whether the seal is aging or damaged to prevent medium leakage.

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V. Adaptation to Environment and Working Conditions

Dust and Anti fouling

In dusty environments, the shaft sleeve should be equipped with a dust cover or sealing structure to prevent particles from entering the friction surface.

. Example: Adopting labyrinth seal or rubber lip seal.

Anti corrosion measures

In corrosive environments, the surface of the shaft sleeve can be coated with anti-corrosion coatings (such as nickel based alloy coatings) or made of duplex stainless steel material.

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Avoid overloading

Ensure that the vacuum pump load is within the design range, as overloading can cause excessive wear or deformation of the shaft sleeve.

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Sixth, Regular Replacement and Life Management

Replacement Cycle

Develop a replacement plan based on operating time, load, and working conditions, usually replacing the shaft sleeve every 1-3 years.

. Exception: If severe wear or damage is detected, immediate replacement is required.

Spare parts management

Reserve commonly used specifications of shaft sleeve spare parts to avoid production losses caused by downtime waiting.

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Note: Spare parts must be exactly the same as the prototype number to avoid compatibility issues.

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7. Professional Maintenance Suggestions

Manufacturer's Guidance

When installing or replacing the shaft sleeve for the first time, refer to the installation manual or video tutorial provided by the equipment manufacturer.

. Example: Some shaft sleeves require pre tightening or a specific installation sequence, which must be strictly followed.

Professional Testing

Regularly commission professional institutions to conduct non-destructive testing (such as ultrasonic testing) on shaft sleeves to detect cracks or internal defects in advance.

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