1Overview of HW type mixed flow pump：
The flow rate and head of HW mixed flow pump are between centrifugal pump and axial flow pump. Small size, light weight, high efficiency, and wide high-efficiency zone, simple structure, easy to use, and easy to maintain. The conveying medium is clear water or similar to clear water, suitable for agricultural irrigation and industrial water supply and drainage.
Application of HW type mixed flow pump: HW type pump is a horizontal single suction volute mixed flow pump. Suitable for transporting clean water or other liquids with physical and chemical properties similar to water.Widely used in various occasions such as farmland irrigation, industrial and urban water supply and drainage.

The HW mixed flow pump is an updated product jointly designed by the domestic water pump industry and is an energy-saving product promoted and used in China's machinery industry.

IIPerformance of HW type mixed flow pump：
Performance range: Flow rate of 180-3665m3/h,
Lift 3.0-20.7m
Supporting power 3-250kw

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IIIHW type mixed flow pump description：
1. Characteristics: Simple structure, reliable use, convenient decoration, high efficiency, small size, and light weight
2. Transmission methods include direct transmission and variable speed transmission. The commonly used power engines are electric motors and diesel engines. When ordering, the model of the power machine (power, speed) should be clearly specified in order to determine the specifications of the coupling and pulley.
3. When the water pump is turned towards the water inlet, the impeller generally rotates counterclockwise (650HW-5, -7, -10 pumps rotate clockwise)
HW type mixed flow pump model description:
Example 300HW-7S
300- Pump inlet and outlet diameter (mm)
HW snail shell mixed flow pump
7-Pump design point head (m)
S-J structural form (front and rear door opening structure)
6. The standard HW-S pump is designed, accepted, and manufactured according to GB/T13008 JB/T6667 standards.

4、 Schematic diagram of HW mixed flow pump structure

5Structure and use of HW mixed flow pump：

HW and HB pumps are mainly composed of main parts such as pump cover, impeller, pump body, pump shaft, shaft sleeve, and bearing body (diameter ≤ 350mm) or bearing frame (diameter ≥ 400mm)

The pump cover is connected to the pump body and the inlet pipe respectively. There should be an appropriate gap between the pump cover plane and the impeller plane. If the gap is too small, it will cause friction; Excessive clearance can cause a large amount of pressure water in the pump body to reflux, reducing the efficiency of the pump. The suitable gap for actual use is 0.3-0.7mm (pushing the pump shaft towards the inlet end of the pump), and the gap can be adjusted by increasing or decreasing the thickness of the paper pad.

The shaft seal device consists of packing, packing gland, packing ring, and packing box on the pump body (150HW and 200HW pumps do not have packing rings). Its function is to prevent air from being sucked into the pump and to prevent excessive water from flowing out along the shaft from the pump.

The shaft sleeve is used to protect the pump shaft. After wear and tear, it can be replaced in a timely manner.

The pump shaft is supported by a single row radial ball bearing. Bearings can be lubricated with lubricating oil - the oil amount should be controlled between the markings of the oil benchmark: lubricating grease can be used for lubrication - it can be added when assembling the water pump. Supplement by disassembling and assembling the front and rear covers during use.

The screw hole on the upper end of the pump body is used for adding water or connecting a vacuum pump for pumping water.

To expand the range of use of the pump and meet different user requirements, the outer diameter of the impeller can be cut or replaced with impellers of different performance (represented by letters such as "A")

The accessories of HW and HB pumps include bent pipes, bottom valves, pulleys or couplings, etc

6、 Performance parameters of HW mixed flow pump