Types of mud pumps
(A) according to the head classification
Dredger mud pumps can be divided into low-pressure high-flow mud pumps according to its head or discharge mud distance, its head is generally 16~35m water column; medium pressure mud pump, its head is 35~55m water column; and high-pressure mud pump, its head is 55~70m water column.
(B) according to the impeller type
1,Impeller type can be divided into two types: open type and closed type. Open impeller blades are ring-shaped, set in a leaf wall, this impeller efficiency is low, no axial thrust, and the possibility of blockage is not large, but the mud pump leakage and is not easy to control. Closed impeller blades are set between two discs (impeller wall plate). Early mud pump impeller are open; modern mud pumps are closed without exception.
2, the impeller can also be divided into single-side suction and double-side suction two types. In the single suction type, mud water from one side into the double suction type, the water is inhaled from both ends. Modern mud pumps are generally single suction type.
3, the impeller can also be divided into runoff type and axial flow type two. Mud pump impeller outer diameter and inner diameter of the ratio with the increase in speed and reduce. The ratio of runoff type impeller is the largest, axial flow type impeller ratio of 1. Most mud pumps for runoff type.
(C) according to the pump shell type
1, constant speed worm shell type: pump casing around the impeller cross-sectional area is incremental, in order to make each cross-section of the discharge velocity is constant, about half the speed of the outer edge of the impeller. With a diffusion cone tube can be converted to this high-speed pressure head. The conversion efficiency of the diffusion cone tube can be as high as 90%.
2,Variable speed worm shell type: the increase rate of the channel area is larger than that required for the constant speed worm shell type, thus the flow rate of the liquid in the worm shell is constantly high and can be as low as 40%.
3,Diffusion vane pump casing:
A guide vane is fitted around the impeller to provide a diffusion channel to reduce the discharge rate. This increases the conversion efficiency by 10-20%, producing a total efficiency of up to 70%.
Comprehensive analysis of the above, consider obtaining its maximum efficiency, modern mud pumps are constant speed worm shell type.
(D) according to the mud pump impeller blade number classification
According to the mud pump impeller blade number can be divided into three blades, four blades, five blades mud pump, theoretically speaking, the mud pump impeller blade is more head and efficiency will increase, in practice in order to get the maximum possible channel in the mud pump, in order to make the dredged material through smoothly, the number of pieces of the impeller should be reduced as much as possible, so the number of mud pump blades in the design of mud pumps should be taken into account in the design of the size of the mud pump and the size of the channel obtained and the maximum dredged material Through the ability, commonly used mud pump impeller are generally 3 to 5 blades. Generally speaking, three piece impeller mud pump channel is larger, not easy to be clogged by debris or stones. For this reason, the general small mud pump in order to facilitate the dredging of debris through the three impellers, of course, small mud pump impeller width than the theoretical calculation of the width is slightly larger.
(E) according to the mud pump impeller shape to points
Can be divided into circular vane type, logarithmic spiral vane and involute vane type. From a large number of application examples, involute vane mud pump efficiency is much higher than the arc vane type. But the circular vane impeller manufacturing easy, generally applicable to small power mud pump. High-power mud pumps are used involute vane mud pump. With the development of the manufacturing industry and the improvement of the means of measurement, people through the logarithmic spiral vane mud pump and involute vane mud pump comparison, found in the slurry capacity is low (<1.24t/m3), the involute vane mud pump efficiency is higher than the logarithmic spiral vane mud pump, and in the slurry capacity is high (>1.24t/m3) the involute vane mud pump efficiency began to be lower than the logarithmic spiral Vane type mud pump (see table 2-1 and 2-2), thus the modern high efficiency mud pump vane began to use logarithmic spiral vane type mud pump, such as the development of recent years, bucket wheel dredger mud pump, because of its high concentration of mud, so most of the use of logarithmic spiral vane type mud pump. [1]
Above is a variety of mud pump classification, now you understand?
