Screw pumpThe actual performance depends on several interrelated parameters. Therefore, choosing the right combination of these parameters is a basic but professional task, as it will determine the performance and service life of the pump.

Gaps:

The screw suspended between the upper and lower bearings rotates above the groove, with a minimum clearance of only a few millimeters between the thread and the groove. Some water will return through this gap, but this is insignificant as long as the gap remains within allowable limits. The smaller the gap, the more efficient the pump. On the other hand, the clearance must allow some deflection of the pump body! In order to maintain uniform and accurate clearance over the total length of the screw, it is important to keep the deflection of the screw pump to a minimum.

D/d = Outer diameter and center tube diameter:

The combination of the outer diameter of the screw pump and the diameter of the center pipe is an important factor in the pump capacity. For long screw pumps, a larger center tube (Figure c) is required to control deflection, but this has an impact on the effective capacity.

Number of Flights:

The effective filling between the helical blades increases with increasing pitch. However, the price of the pump is also affected by the number of flights. In some cases, 1 screw pump is sufficient. For every situation, Spaans Babcock looks for the best solution!

Installation Angle:

As can be seen from the simplified diagram below: the smaller the inclination Angle to the horizontal axis, the better the effective filling >ergo> the better the pump efficiency. However, when the required lift is quite high, we need to increase the Angle to keep the deflection of the screw within the allowable tolerance. Spaans Babcock normalized angles to 30º, 35º, and 38º. Depending on Spaans Babcock's request or recommendation, other angles are possible, but always between 22º and 40º.

Asphalt:

Pitch is another parameter that affects pump capacity. Spaans Babcock does not follow fixed rules (e.g., pitch=D), but chooses different spacing for various angles.

Rotation speed:

Each particular pump has its own optimal speed. Spaans Babcock uses ir's formula. Muyskens determines the optimal speed.

The above content is about the explanation of screw pump parameters, need to know more about screw pump news can consult Shenzhen Oudejie Technology Co., LTD.!