LUOYANG MONTON BEARING SCIENCE & TECHNOLOGY CO.,LTD.
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7304BEA 20*52*15mm Twin screw compressor bearings

7304BEA 20*52*15mm Twin Screw Compressor Bearings

Reference FOB Price:
US220 ~ 280 / Piece
Min. Order:
1 Piece
Stock:
1 Piece
Production Capacity:
1000PCS/WEEK
Port:
Shanghai/Qingdao
Payment term:
T/T
Delivery time:
5-35 days
Technical Parameters:
Product Designations:
7304BEA
Old Designations:
7304BECBM
HS Code:
84821020.00
Structure:
Ball
Number of Rows:
Single row
Inside Diameter:
20 mm
Outside Diameter:
52 mm
Thickness:
15 mm
Weight:
0.06 KG
Dynamic load Capacity, Radial (Cr):
19800
Static load Capacity, Radial (Cor):
10500
Reference speed (Grease rpm):
18000
Limiting speed (Oil rpm):
23500
Demensions:
20*52*15mm
Brand:
MONTON
Radial Clearance Trade No.:
C0
Precision Rating:
P5
Vibration:
Z3V3
Load Direction:
Radial/Axial
Bearing Material:
Gcr15
Cage Type:
Brass
Cage material:
brass
Seals Type:
No seals
Number of Balls:
32
Ball Material:
Gcr15
Contact Angle:
40
Transport Package:
Single box
Shipping Ways:
Air/Sea
Country of Origin:
China
Service:
OEM
Quality Control:
Self control
Feature:
Balls
Chamfer (R):
1.5
Chamfer (r):
1.5
Application:
Twin screw compressor
7304BEA 20*52*15mm Twin Screw Compressor Bearings

 

Bearing Numbers Boundary Dimensions (mm) Basic Load Ratings (N) Limiting Speed (min-1)
d D B r (min) r(min) Cr COr
7304BEA 20 52 15 1.1 0.6 19,800 10,500 18,000

The function of bearings in twin screw compressors is to provide accurate radial and axial positioning of the rotors and to support the load on the rotors. These functions are to

be performed reliably, with low friction and low noise generation.


With accurate positioning of the rotors, it is possible to design the compressor with small clearances for

high efficiency. Radial positioning accuracy of the rotors is accomplished by using bearings having

small operating clearances and high running accuracy (low run-out). Axial positioning accuracy is accomplished by small axial bearing clearance or preload. Axial positioning accuracy is also affected by the fit between the thrust bearing inner ring and the shaft and bearing deflection and displacement due to centrifugal forces.


Interference fits will change the axial position of the outer ring after mounting. Axial positioning accuracy is also affected by the accuracy of the adjustment of the rotor end clearance during assembly. Thrust bearings mounted with interference fits make the adjustment more difficult.


In large industrial refrigeration compressors and in some air conditioning compressors, the available

rotor center distance can be a primary criteria in the bearing selection.


The rotor profile affects the center distance; therefore, the rotor design and bearing selection process is sometimes iterative. The center distance limits the size of the bearing outer diameters. Therefore, if one

rotor carries a higher load, it is possible to select a larger bearing for this rotor and a smaller bearing for the other.


This design option is however in conflict with the desire to minimize the number of different bearings in

the compressor and also requires additional tooling for the production of the compressor housing.

The rotors can be supported on rolling bearings or on a combination of hydrodynamic and rolling bearings.

The main advantage with rolling bearings is their small operating clearances. Rolling bearings also have lower friction than hydrodynamic bearings, require less oil for lubrication and cooling, and are less sensitive to momentary loss of lubricant and refrigerant flooding than hydrodynamic bearings.

 

 


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