The hydraulic screw pump is a type of volumetric rotary pump that utilizes one or more screws to intermesh with a bushing (or pump casing), forming several sealed chambers. Through the rotation of the screws, liquid is continuously pushed axially from the suction end to the discharge end. Its core feature is extremely minimal flow pulsation (theoretically without pulsation), strong self-priming ability (up to 9 meters of vacuum height), the ability to transport high-viscosity media (up to 500,000 cSt), and smooth operation with low noise.
Products features
Pulsation-free conveying - The screw continuously meshes, and the sealed chambers are sequentially advanced, resulting in extremely low flow pulsation (theoretically zero), suitable for precision hydraulic systems and metering conveyance.
Strong self-priming capability - Dry self-priming can reach a vacuum height of 9 meters, no need for water priming, capable of suctioning gas/liquid mixed media, with excellent gas-liquid mixed conveying ability.
High viscosity adaptation - Can convey media with viscosities up to 500,000 cSt (triple screw/double screw) or even 1,000,000 cSt (single screw), ranging from light fuel oil to heavy asphalt, syrup, and sludge.
Multiple drive methods - Motor direct coupling, belt drive, diesel engine drive, hydraulic motor drive, suitable for fixed pumping stations and mobile equipment.
Product type
Three-screw pump (3SC/3SN/3SD series): One driving screw (rotor) drives two driven screws (sealing screws), with the driving screw serving as the power input and the driven screws performing the sealing function. It has a compact structure, minimal flow pulsation, and high pressure (up to 25 MPa). It is a standard configuration for hydraulic systems, lubricating oil circulation, and fuel transportation. Flow rate 0.5 - 2000 m³/h, pressure 0.5 - 25 MPa, rotational speed 750 - 3600 rpm, medium viscosity 2 - 5000 cSt (special design up to 500,000 cSt).
Double-screw pump (2W/2H series): Two screws are driven by synchronous gears and do not come into contact with each other. It can transport non-lubricating media (such as water, gasoline) and high-viscosity media (such as asphalt, syrup). Flow rate 1 - 3000 m³/h, pressure 1.0 - 4.0 MPa, medium viscosity up to 500,000 cSt, allowing a small amount of solid particles (≤ 100 μm).
Single-screw pump (eccentric screw pump, PC series): The metal screw rotates eccentrically within the rubber liner to form a continuous sealing chamber. It is suitable for high-viscosity, solid-particle-containing, and fiber-containing media (sludge, jam, drilling mud, food sauce). Flow rate 0.1 - 500 m³/h, pressure 0.6 - 4.8 MPa, medium viscosity up to 1,000,000 cSt, allowing a solid content of ≤ 60%.
Application scenario
The key points of the hydraulic screw pump are "high viscosity/containing gas/containing solid media + pulsation-free transportation + self-priming", and the core scenarios are:
Petroleum and chemical industry
Crude oil transportation: double screw/triple screw, long-distance pipeline transportation of high-viscosity crude oil, heated jacket insulation
Lubricating oil/hydraulic oil circulation: triple screw pump, lubrication systems in steel mills/power plants/ships, pressure 1.0 - 25 MPa
Fuel transportation: heavy oil/diesel/fuel oil, boiler fuel supply, gas turbine fuel supply
Chemical raw materials: polymers,resins,glue,glycerol, etc. high-viscosity chemicals
Shipping and navigation
Hydraulic system for steering gear: triple screw pump, pressure 10 - 25 MPa, providing hydraulic power for steering gear
Main engine lubricating oil pump: triple screw, providing lubricating oil circulation for ship diesel engines
Fuel transportation/transfer: double screw, transfer of heavy oil/diesel
Ballast water/waste oil: single screw, discharge of solid-containing wastewater
Hydraulic system for anchor/anchor winch: triple screw pump set
Food and pharmaceutical industry
Food sauces: single screw pump, transporting tomato sauce, chocolate, honey, jam, without damaging particles
Dairy products: yogurt, cheese, condensed milk, hygienic grade stainless steel + EPDM liner
Pharmaceuticals: ointment, syrup, extract, aseptic design, CIP/SIP cleaning
Environmental protection and water treatment
Sludge transportation: single screw pump, municipal/industrial sludge, solid content ≤ 60%
Coagulant/agent dosing: single screw metering pump, precise dosing
Wastewater treatment project: sludge/wastewater transportation of biogas
Supplier Introduction
CZME is a world-class manufacturer of high-performance pumping solutions, serving industries such as mining, construction, environmental protection, and water treatment. We specialize in the production of Slurry pumps, Dredge pumps, Desulfurization pump, Marine dredging pumps, and other industrial pumps designed for handling solid-laden, highly abrasive, and corrosive slurries. Our expertise in slurry and wastewater management makes us a trusted partner for clients worldwide.
FAQs
Q: What are the differences between a hydraulic screw pump and a centrifugal pump?
A: A screw pump is a positive displacement pump. Its flow rate is directly proportional to the rotational speed and is independent of pressure. It has a strong self-priming ability and can handle high-viscosity media. A centrifugal pump relies on the centrifugal force of the impeller to increase pressure. It has a large flow rate but weak self-priming ability and is suitable for low-viscosity media. In simple terms: high viscosity/containing gas/require self-priming → screw pump; large flow rate/low viscosity clean water/mineral slurry → centrifugal pump.
Q: Can a three-screw pump handle water?
A: Yes, but it is not recommended. The three-screw pump is designed for lubricating media (such as oil). Water has a low viscosity (1 cSt), poor lubricity, which will cause the screws and bushings to wear out faster. Water should be transported by a double-screw pump (synchronous gear drive, screws not in contact) or a single-screw pump (rubber bushing).
Q: How is the flow rate of a hydraulic screw pump adjusted?
A: It is mainly adjusted by changing the motor speed through frequency conversion, which linearly regulates the flow rate (flow rate ∝ rotational speed). It can also be adjusted by regulating the bypass valve for backflow, but the energy consumption is higher. Three-screw pumps are not recommended to be adjusted by throttling the outlet valve (it may cause overpressure).
Q: Can a screw pump run without media?
A: Absolutely not. The screw pump relies on the medium for lubrication and cooling. Running it without media will cause dry friction between the screws and the bushings, and it will burn out within a short time. It is necessary to ensure that the pump chamber is filled with the medium before starting and install a dry running protector.
Q: What are the advantages compared to a gear pump?
A: The flow pulsation of a screw pump is much smaller than that of a gear pump (theoretically no pulsation), it has lower noise, has less shear effect on the medium (suitable for sensitive media such as emulsions, polymers), has a stronger self-priming ability, and has a longer service life (no gear meshing wear). However, the gear pump has a lower cost and is suitable for low-pressure and small-flow scenarios.
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