How to select China sand dredge pump?
(1) How to select China Sand Dredge Pump?
Sand dredge pump is Classified by pump working pressure
Sand dredge pumps can be divided into low pressure and large flow dredge pumps according to their heads or discharge distances. The heads are generally 16~35m working head; medium pressure dredge pumps takes out heads 35~55m head pressure; and high pressure sand dredge pumps is working 55~70m pressure.
(2)How to select China Sand dredge pump?
Sand dredge pump is classified by the impeller type
1. The dredge pump impeller type can be separated and closed. The blades of the open impeller are ring-shaped and are arranged on a blade wall. This type of impeller has low efficiency, no axial thrust, and is unlikely to block, but the leakage of the mud pump is large and difficult to control. Each blade of the closed impeller is arranged between two discs (impeller wall panels). Early mud pump impellers were all open type; modern mud pumps were all closed type without exception.
2. The dredge pump impeller can also be divided into two types: single-side suction and double-side suction. In the single suction type, the mud water enters from one side, while in the double suction type, the water is sucked in from both ends. Modern mud pumps are generally of single-suction type.
3. The dredge pump impeller can also be divided into two types: radial flow and axial flow. The ratio of the outer diameter to the inner diameter of the mud pump impeller decreases with the increase of the specific speed. The ratio of the radial flow impeller is the largest, and the ratio of the axial flow impeller is 1. Most mud pumps are of the radial flow type.
(3) How to select China Sand dredge pump?
Sand dredge pump is selected according to pump shell type
1. Constant-speed volute type: The cross-sectional area of the pump casing around the impeller is gradually increased, so that the discharge speed of each section is constant, which is about half of the outer edge of the impeller. A diffuser cone can convert this high speed into a pressure head. The conversion efficiency of the diffusion cone can be as high as 90%.
2. Variable-speed volute type: The increase rate of the channel area is greater than that required for the constant-speed volute type, so the flow rate of the liquid in the volute is continuously high, which can be as low as 40%.
3, diffuse vane pump casing:
A guide vane is installed around the impeller to provide a diffusion channel to reduce the discharge speed. This can increase the conversion efficiency by 10-20%, and the total efficiency produced can reach 70%.
Based on the above analysis, considering to obtain its maximum efficiency, modern mud pumps are all constant speed volute type.
(4) How to select China Sand dredge pump?
Sand dredge pump is Classified by the number of mud pump impeller blades
According to the number of blades of the mud pump impeller, it can be divided into three-bladed, four-bladed, and five-bladed mud pumps. Theoretically speaking, if there are more impeller blades, the head and efficiency of the mud pump will increase. In actual use, in order to obtain the maximum possibility in the mud pump In order to allow the dredged material to pass smoothly, the number of impellers should be reduced as much as possible. Therefore, the number of blades of the mud pump should be designed to consider the size of the mud pump and the obtained channel size and the maximum dredged material passing capacity. Commonly used mud pump impellers are generally 3 to 5 blades. Generally speaking, the three-blade mud pump has a large channel and is not easy to be blocked by debris or rocks. For this reason, in order to facilitate the passage of debris in the dredging, small mud pumps have three impellers. Of course, the width of the impeller of the small mud pump is slightly larger than the theoretical calculation width.
(5) How to select China Sand dredge pump?
China sand dredge pump is selected According to the shape of mud pump impeller
It can be divided into arc blade type, logarithmic spiral blade and involute blade type. Judging from a large number of application examples, the efficiency of the involute blade type mud pump is much higher than that of the arc blade type. But the arc-blade impeller is easy to manufacture and is generally suitable for low-power mud pumps. High-power mud pumps all use involute vane type mud pumps. With the development of the manufacturing industry and the improvement of measurement methods, people have compared logarithmic spiral blade type mud pumps with involute blade type mud pumps and found that when the mud bulk density is low (<1.24t/m3), it gradually opens. The efficiency of the linear vane type mud pump is higher than that of the logarithmic spiral vane type mud pump, and the efficiency of the involute vane type mud pump is lower than that of the logarithmic spiral vane type mud pump when the mud bulk density is higher (>1.24t/m3) (See Tables 2-1 and 2-2). Therefore, the blades of modern high-efficiency dredge pumps have begun to use logarithmic spiral blade type mud pumps, such as the bucket wheel dredger mud pumps developed in recent years. The concentration is high, so most of them use logarithmic spiral blade type mud pump.
