Screw pump What is the operating environment of?

1. The screw pump shall operate at the rated power, generally 80% - 110% of the rated power of the screw pump.

2. The temperature of the medium conveyed by the screw pump shall not be higher than 40 ℃, and the pH of the substance conveyed shall be between 2 and 12.

3. The materials delivered by the screw pump contain sand or insoluble materials, whose volume proportion is not more than 0.1%, and the particle size is not more than 0.2mm.

4. The materials transported by the screw pump shall not contain strong corrosive liquids such as special chemical synthetic liquid.

5、 IMO screw pump The starting frequency shall meet relevant regulations.

Specific speed is also called specific speed. It has nothing to do with the speed of the screw pump, but a goal reflecting its comprehensive functions. In short, any screw pump with similar structures has the same ratio, so it can be distinguished according to the specific speed. If the specific speed of centrifugal pump is generally low and that of uranium flow pump is generally high, the specific speed of mixed flow pump is between the two. The characteristics of the pump body structure are determined by several structures of the pump, and its operating characteristic curve is similar to it. Because of the above characteristics, the specific speed is often considered when designing and using the screw pump.

The concept of pump head is often misunderstood and needs to be distinguished. First, two different concepts should be distinguished: the terrain head of the pump and the total head of the pump. Terrain lift refers to the straight height from the ground to the outlet of the hydrophilic pressure outlet pipe. The total head of the pump refers to the ground head of the pump, plus t: the energy loss caused by water flow in the pipeline, The frictional hydraulic loss along the pipeline refers to the frictional loss caused by moving along the pipeline length, and part of the resistance refers to the energy loss caused by pipe fittings such as elbows, alarm valves, etc.

The ratios of diaphragm pumps are different. An important factor is that the shape of the impeller is different. The low specific speed impeller is a centrifugal impeller. As the specific speed decreases, the flow channel of the impeller narrows, and the shape of the impeller becomes very thin, like a large and thin disc. As the specific speed increases, the impeller becomes thinner and thicker, The specific speed is also getting higher and higher, finally forming a sleeve impeller.