Technical Requirements for Sliding Bearing of Axial Flow Pump

Technical Requirements for Sliding Bearing of Axial Flow Pump

1, the basic requirements

It is necessary to make the journal and sliding bearings evenly and in fine contact, but also have a certain gap.

2, contact angle

Refers to the journal and the sliding bearing contact with the center of the center of the angle.

Contact angle can not be too big nor too small. The contact angle is too small will increase the sliding bearing pressure, serious will make the sliding bearing a greater deformation, accelerated wear and shorten the service life; contact angle is too large, will affect the formation of oil film, not a good liquid lubrication.

The experimental study shows that the limit of the contact angle of the sliding bearing is 120 °. When the sliding bearing wears into this contact angle, the liquid lubrication is destroyed. So no longer affect the sliding bearing under pressure conditions, the contact angle is smaller as possible.

From the theoretical analysis of the friction force, when the contact angle is 60 °, the friction torque is the smallest, so it is suggested that the sliding bearing with speed higher than 500r / min has a contact angle of 60 ° and a speed of less than 500r / min, The contact angle can be 90 ° or 60 °

3, contact points

The actual contact of the journal with the surface of the sliding bearing can be expressed by the actual number of contacts per unit area. The more contact points, the more detailed, the more uniform, said the sliding bearing scraping the better, on the contrary, it means that the sliding bearing scraping research is not good.

Generally speaking, the more fine the contact point, the greater the difficulty of scraping. Production should be based on the performance of sliding bearings and working conditions to determine the contact point, the following table of information available for reference:

Sliding bearing speed (r / min)

Contact point (number of contacts per 25 x 25 mm area)

100 or less

3 ~ 5

100 ~ 500

10 ~ 15

500 to 1000

15 ~ 20

1000 to 2000

20 to 25

2000 or more

25 or more

Ⅰ and Ⅱ grade precision machinery can use the above table data, Ⅲ grade precision of the machine can be halved by the above table data.