Do you know what a hydraulic screw pump is? In fact, a hydraulic screw pump is a positive displacement pump used to transport fluid in a hydraulic system. It works by capturing and displacing fluid through the rotation of an intermeshing screw or helical rotor within a cylindrical housing. As the screws rotate, they create chambers that draw in and discharge fluid, creating a continuous flow. These pumps are known for their high efficiency, ability to handle high-pressure applications, and smooth, pulsation-free flow. They are widely used in industries such as manufacturing, construction, agriculture, and automotive, where precise fluid control and reliable performance are critical.
1. Structural structure of screw pump
The hydraulic screw pump is a low-pressure, large-flow liquid conveying equipment with a relatively simple and sturdy structure. The following are some of the main uses of hydraulic screw pumps:
Screw pump shaft: The shaft is the rotation center of the hydraulic screw pump. It is usually made of corrosion-resistant materials such as stainless steel or special alloys to adapt to different applications. The shaft runs through the entire pump body, supports the spiral blades, and provides rotational power from a drive source (such as a motor) to the blades.
Spiral Blades: Spiral blades are metal plates fixed to a shaft that are arranged in a spiral shape at a specific pitch and angle. The design of these vanes is critical to the efficiency of the pump, as their shape determines how efficiently and quickly liquid is lifted. The material and surface treatment of the blades also vary according to the nature of the liquid being transported to ensure durability and corrosion protection.
Housing: The housing is usually cylindrical and surrounds the shaft and spiral blades to form a sealed channel. This channel allows liquid to enter and move along the spiral blades. The design of the housing ensures minimal flow resistance and effective sealing to prevent liquid leakage.
Inlet and outlet: The inlet allows the liquid to be transported to enter the hydraulic screw pump smoothly, while the outlet guides the lifted liquid to leave the pump body. The design of these two parts is equally important to the performance of the pump, as they affect the flow of the liquid and the pump's ability to handle.
Bearings: Bearings are used to support a shaft at both ends or in the middle to reduce friction and wear during rotation. The type and quality of bearings directly affect the operating stability and life of the pump.
Seals: To prevent fluid from leaking along the shaft and preventing outside contaminants from entering the pump body, seals are critical. It can be of different types such as mechanical seal or stuffing box, chosen depending on the application of the pump and the nature of the liquid being transported.
Drive: Although not an integral part of the hydraulic screw pump itself, the drive (usually a motor) provides the necessary power to the pump. The selection of the drive, including its specifications such as power, speed and voltage, will be based on the required performance parameters of the hydraulic screw pump.
The design of the hydraulic screw pump allows it to operate at lower rotational speeds, which is advantageous for handling media containing larger solid particles or fibrous materials, as these materials may cause blockage or damage in the pump rotating at high speed. Additionally, hydraulic screw pumps are self-priming, which means they are able to suck up liquid without the help of external force.
2. Working principle of hydraulic screw pump
A hydraulic screw pump, also known as a screw pump or Archimedean screw pump, is a device that uses rotating screw blades to transport liquids. Its working principle is based on a relatively simple mechanism that combines the rotational motion of the spiral and the flow characteristics of the liquid to achieve effective liquid transport.
Rotation of the spiral blades: When the shaft of the hydraulic screw pump begins to rotate, the spiral blades fixed on the shaft also rotate. The blades are designed in a spiral shape, resembling a giant screw. As the shaft rotates, each vane continuously contacts the liquid and captures a certain amount of liquid during its "upward" phase.
Lifting of liquid: Due to the geometry and arrangement angle of the spiral blades, when the shaft rotates, the blades will push the liquid upward or forward. The process is continuous because as the shaft rotates, new blades continue to take over the position of the previous blades, continuing to push the liquid forward.
Flow of liquid: The liquid pushed by the spiral blades moves along the channels in the pump casing. The channel is designed to allow liquid to flow with low resistance, and as the liquid rises, the shape of the channel may gradually change to accommodate changes in pressure and provide a more efficient flow path.
The role of the inlet and outlet: the liquid enters through the inlet of the pump and moves toward the outlet driven by the spiral blades. The inlet is usually located in the lower part of the pump, while the outlet is located in the upper part or side. The purpose of this design is to use gravity and the lift of the spiral to help transport the liquid.
Self-priming capability: Hydraulic screw pumps are self-priming, which means they are able to suck up liquid without the help of external force. This is because when the pump starts, the rotation of the spiral blades creates a low-pressure area at the inlet, thereby attracting liquid into the pump body.
Pressure vs. Flow Rate: A hydraulic screw pump generates relatively small amounts of pressure, but due to its design, it is capable of delivering large, consistent flows. The amount of pressure depends on the size of the pump, the pitch of the screw, and the rotational speed. The flow rate mainly depends on the diameter and rotation speed of the spiral.
Tolerance of solid impurities: Due to the low rotation speed of the hydraulic screw pump and the smooth flow of liquid, it can handle media containing larger solid particles or fibrous materials without causing blockage or damage. This is very important for wastewater treatment and some industrial applications.
3. Application of hydraulic screw pump
Due to their unique design and working principle, hydraulic screw pumps are widely used in many applications that require large flow and low head liquid transportation. The following is a description of some of the main applications of hydraulic screw pumps:
Sewage treatment: In the field of environmental protection, hydraulic screw pumps are often used in sewage treatment plants to lift sewage and sludge. Its design allows the conveying of media containing solid particles and fibrous materials without being easily clogged or damaged like high-speed rotating centrifugal pumps.
Agricultural irrigation: In the agricultural field, hydraulic screw pumps are used to lift water sources for irrigation. It is capable of handling sandy water and water containing crop residues and requires low pump maintenance, making it suitable for long-term continuous operation.
Chemical industry: In the chemical industry, hydraulic screw pumps can be used to transport various chemical liquids, especially when large flow rates and low pressure are required. Its self-priming capabilities and tolerance of solid impurities make it ideal for handling corrosive and abrasive chemicals.
Food industry: In the food industry, hydraulic screw pumps are used to transport viscous liquids such as jam, slurry, etc. Its gentle transport properties ensure food integrity and reduce losses during production.
Aquaculture: In the aquaculture industry, hydraulic screw pumps are used to circulate and oxygenate water bodies to keep the water clean and oxygen-rich, and provide a good growth environment for aquatic organisms.
These applications demonstrate the versatility and adaptability of hydraulic screw pumps, making them an indispensable tool in many industrial and agricultural processes.
Poocca hydraulic manufacturer sells Settima screw pumps G55, GR55, GR47, STM16B. To learn more, please consult poocca and look forward to cooperating with you.
In addition to screw pumps, Poocca Hydraulic Manufacturer also sells various gear pumps, piston pumps, vane pumps, hydraulic motors, hydraulic valves, hydraulic accessories and other products, up to 1500 types, many conventional products are in stock and can be shipped quickly, saving you shopping time.
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