Since the vertical screw pump is formed under high speed operation, the rotor speed is too fast to form a bearing heat supporting the rotor. Usually, the bearing is overheated during the operation of the vertical screw pump. The following reasons are caused by the vertical screw pump running for a long time. Because the vertical screw pump is formed under high speed operation, the rotor rotates too fast to form a bearing that supports the rotor. fever. There are several reasons why bearings are overheated during the vertical screw pump operation:
Cold Drawn Steel Bar is produced by hot rolled steel bar or wire rod to get smooth surface, more precision size, higher mechanical properties, which improves machining characteristics. It can also get various sections and sizes. So cold drawn steel bar is a better choice for machining users.
According to different steel grade, the production line is usually different. The Basic production line is as below:
For high carbon steel or alloy steel bars, to avoid the cracks in inner or surface, the bars are usually required to be annealed before cold drawing.
To get different mechanical properties or hardness depending on final usage, the cold drawn bars will also be heat treated such as annealed, normalized or quenched and tempered(Q&T).
For CNC machines usage, to get much more precision sizes or much more better surface roughness for chrome plating, the cold drawn steel bars can also be centerless ground or polished.
We have more advantages on producing cold drawn steel bars:
1) Big stocks of hot rolled round bars or wire rods as raw materials
2) Wide range of cold drawn steel bar sizes: from 10mm to 150mm
3) Different cold drawing medias powder or oil to get different surface
4) Straightening machines to get better straightness up to 0.5mm/m
5) Grinding and polishing machines to get better roughness upto 0.4um
6) Heat treating furnaces to adjust the mechanical properties
7) Full sets of testing equipment to test the sizes, mechanical properties and microstructure.
8) Multiple packages to avoid broken packages and anti-rusty
1. Valve plate cracking: When a valve plate is cracked, the pressure on both sides of the impeller will be unbalanced, the axial force will occur in the rotor, and the bearing load will be intensified. The long-term operation will increase the bearing temperature. In this case, the valve plate should be replaced in time.
2, shaft end seal failure: When the shaft end seal packing is damaged or the sealing oil hole is blocked, Bo Taibang will form air from these damaged gaps into the pump body, which will form the pump's suction and exhaust performance. If only one side of the seal fails, the pressure imbalance on both sides of the impeller will be formed, and the axial force of the rotor will increase the bearing load, thereby increasing the bearing temperature.
3, the bearing pre-tightening force is too large: this situation will promote the bearing clearance reduction or no play, forming the bearing temperature.
4, sensation: When the pump body or bearing sensation is large, the bearing temperature will be too high, look at the pump body to find the cause of the sensation, eliminate the sensation, then the bearing temperature recovery.
5, smooth appearance: smooth grease increase is too large and too small, vertical screw pump or smooth grease type does not match, its use time is too long or smooth grease will be contaminated will form bearing heat. At this moment, you should check the smooth grease type, ask the manufacturer the appropriate amount, adjust the smooth grease to recover the bearing temperature.
6, bearing damage: vertical screw pump bearing roll and bearing cage damage will be accompanied by the appearance of bearing overheating. Bearing damage is necessary to replace the new bearing in time.
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Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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