Китайский производитель центробежных насосов
Китайский производитель центробежных насосов
The flow rate and head of the HW mixed-flow pump fall between those of centrifugal pumps and axial-flow pumps. It features compact size, light weight, high efficiency with a wide high-efficiency range, simple structure, convenient operation and easy maintenance. It is suitable for handling clean water or other fluids similar to clean water, and is widely used in farmland irrigation and drainage as well as industrial water supply and drainage.
Application of HW Mixed-Flow Pump
The HW pump is a horizontal single-suction volute mixed-flow pump. It is designed for conveying clean water or other liquids with physical and chemical properties similar to water. It is widely applied in farmland irrigation and drainage, industrial water supply and drainage, urban water supply and drainage, and other fields.
The HW mixed-flow pump is an upgraded product jointly designed by the domestic pump industry in China, and is an energy-saving product promoted and applied by China’s machinery industry.
Performance of HW Mixed-Flow Pump
Performance Range:
Flow rate: 180–3665 m³/h
Head: 3.0–20.7 m
Matching power: 3–250 kW
III. Description of HW Mixed-Flow Pump
FeaturesSimple structure, reliable operation, convenient installation and maintenance, high efficiency, compact size and light weight.
Drive modesDirect drive and variable-speed drive. Common prime movers are electric motors and diesel engines.The type (power, speed) of the prime mover shall be specified when ordering to determine the specifications of the coupling and pulley.
Rotation directionViewed from the pump inlet, the impeller generally rotates counterclockwise(Models 650HW-5, 650HW-7 and 650HW-10 rotate clockwise).
Model Explanation of HW Mixed-Flow Pump
Example: 300HW-7S
300: Inlet and outlet diameter of the pump (mm)
HW: Volute mixed-flow pump
7: Design point head of the pump (m)
S: Structural type (front and rear door structure)
Adopted standards
The HW-S pump is designed, manufactured and inspected in accordance with GB/T 13008 and JB/T 6667.
Structure and Application of HW Mixed-Flow Pump
HW and HB type pumps mainly consist of pump cover, impeller, pump body, pump shaft, shaft sleeve, bearing body (for bore diameter ≤ 350 mm) or bearing bracket (for bore diameter ≥ 400 mm) and other main components.
The pump cover is connected to the pump body and the inlet pipe respectively. A proper clearance shall be maintained between the pump cover face and the impeller face.Too small a clearance will cause friction; too large a clearance will result in substantial backflow of pressurized water inside the pump body, reducing pump efficiency.The recommended practical clearance is 0.3–0.7 mm (with the pump shaft pushed toward the pump inlet). The clearance can be adjusted by increasing or decreasing the thickness of paper gaskets.
The shaft sealing device consists of packing, packing gland, packing ring and stuffing box on the pump body (150HW and 200HW pumps are not equipped with packing rings).Its function is to prevent air from entering the pump and excessive water leakage along the shaft.
The shaft sleeve is used to protect the pump shaft and can be replaced promptly when worn.
The pump shaft is supported by single-row radial ball bearings.Bearings can be lubricated with lubricating oil – oil level shall be controlled between the marks on the oil gauge;or lubricated with grease – which can be filled during pump assembly and replenished by removing the front and rear covers during operation.
The threaded hole on the upper part of the pump body is used for priming or connecting a vacuum pump for evacuation and priming.
To expand the application range and meet different user requirements, the outer diameter of the impeller can be cut or impellers with different performances can be substituted (marked with letter “A”, etc.).
Accessories for HW and HB type pumps include elbows, foot valves, pulleys or couplings, etc.