Schineit Spiral Centrifugal Pumps combine the advantages of centrifugal and positive displacement pumps, redefining the concept and form of high self-priming, high-flow pumps. Each Schineit³ pump features a large-clearance spiral impeller that gently pumps the medium into the pump chamber and transports it to the discharge pipe. The open impeller easily handles large solid particles and long fiber objects, while the spiral design is highly suitable for conveying substances with high solid content and highly viscous liquids. The result is a high-efficiency, low NPSH pump that simultaneously saves energy, reduces consumption, and lowers costs.
Additionally, Schineit* pumps excel in non-clogging performance when conveying long fiber suspended media, which reduces the cost of unblocking compared to traditional pumps. The ultra-fast gentle transition capability and low shear pumping function significantly reduce the damage to the pump body from abrasive liquids and the destruction of high molecular substances by equipment. Therefore, Schineit@ pumps are highly suitable for conveying slurries and sludge in processes such as kitchen waste treatment, agricultural waste treatment, bioenergy treatment, beer and food manufacturing, construction, mining, pulp and paper production, and pet food processing and wastewater treatment.
The design, development, and manufacturing of Schineit° spiral centrifugal pumps focus on high hydraulic efficiency and low operating costs to achieve a reduction in total usage costs. The specially designed impeller ensures high efficiency and low energy consumption when handling viscous liquids. The combination of ultra-short transition capability, reinforced impeller, and high-quality casing effectively reduces equipment wear. The extremely low NPSH value further minimizes maintenance costs due to cavitation damage.
| Maximum Flow Rate |
13000 m3/h |
| Maximum Head |
100m |
| Nominal Pipe Size |
DN50-DN1000 |
| Viscosity |
3000 CPS |
| Maximum Suction Lift |
9 mwc |
| Solids Content |
2mentioned 20%,30% sludge |
The Working Principle of Schineit Spiral Centrifugal Pumps
Schineit" Spiral Centrifugal Pumps employ a spiral centrifugal impeller to propel the medium into a conical casing or passage. The centrifugal force generated by the impeller's rotation then imparts pressure energy to the medium, allowing it to be expelled outward.
The design of the open spiral centrifugal impeller features a low NPSH (as low as 1mWc), which can reduce equipment maintenance costs due to cavitation damage, enabling the spiral centrifugal pump to operate normally even under poor piping conditions or in situations that are particularly challenging for traditional centrifugal pumps.
Schineit*'s spiral centrifugal impeller channels have large blade clearances, capable of passing large solid particles. Media up to 80% of the discharge outlet diameter, such as fruits, vegetables, fish, etc., can enter the smooth impeller channels.
The combination of Schineit spiral centrifugal pump's conical suction port, wide blade clearance, and smooth channels ensures non-clogging during the transport of the medium from the impeller inlet to the outlet. This design also shortens the transition time of the medium within the pump, reducing wear caused by fine solid suspensions such as grit, silicon carbide, and other similar substances, allowing the pump to handle media with up to 30% solids content. Additionally, each Schineit@ spiral pump is equipped with an external spiral that allows for adjustment of the impeller-to-casing clearance to ensure high efficiency and low energy consumption. To accommodate various installation methods for Schineit® spiral centrifugal pumps, the impeller-to-casing clearance adjustment is available in three modes.
Schineit" impellers rarely come into contact with the objects being drawn in and have extremely low shear forces. Traditional centrifugal pumps have higher shear forces due to the contact between the medium and the impeller's cutting surface.
The low shear force of Schineit" impellers prevents material damage, making them highly suitable for conveying loose materials without causing breakage or for transporting crystalline fluids (such as activated carbon) while maintaining their original structure to the greatest extent.
Unique Spiral Centrifugal Impeller
Schineit Spiral Centrifugal Pumps integrate the advantages of traditional centrifugal pumps and screw pumps (or positive displacement pumps) into a unique structure composed of one or two large wrap-angle open twisted blades. This design excels in its ability to handle large particles, long fibers, highly viscous, and high-concentration liquids. When conveying slurries, these pumps operate smoothly with minimal damage to the slurry, offering excellent non-destructive performance.
The spiral section:
Generates a helical propulsion effect, with the leading edge of the impeller shaped like a sickle. The blades increase in radius along the hub, guiding the liquid flow and the conveyed objects towards the vicinity of the axis. The helical action then propels them along the axis to the centrifugal section, providing excellent suction capabilities and a lower level of cavitation.
The centrifugal section:
Converts the energy of the impeller into pressure energy within the volute casing. Due to the action of the centrifugal section, the liquid is expelled from the discharge port.
The length and area of the spiral centrifugal impeller are 3-5 times those of traditional single-channel impellers. This allows energy to be gradually transferred to the liquid along the entire length of the impeller, resulting in lower surface pressure. The low energy gradient and large curvature of the blades lead to a smaller acceleration from the initial velocity of 0 to the outlet velocity, which remains constant throughout the entire process, maintaining a smooth flow with low shear and low turbulence.
This unique design gently transports the liquid from the inlet to the outlet, saving energy and causing minimal damage to the impeller surface.
The illustration compares the energy transfer surfaces of a spiral impeller and a traditional impeller with the same power and rotational speed. It shows that the length of the spiral impeller is more than three times greater than that of the traditional impeller, and the unfolded area is also over three times larger. This results in a smaller energy transfer gradient and lower energy losses.
In contrast, the traditional centrifugal impeller requires the fluid to make a 90° turn from the pump inlet to the outlet, leading to a sudden change in energy transfer and significant local losses. This is particularly problematic when conveying activated sludge, as it can break apart the sludge. Additionally, the sharp turn can easily cause blockages from impurities in the medium.
The spiral centrifugal impeller, however, features a very open channel with a helical rotation, avoiding any abrupt turns. This allows the activated sludge to maintain its original form, and the impeller is less prone to clogging.
Advantages of Spiral Centrifugal Impeller Pumps
I Large Passage Diameter, Non-Clogging and Non-Tangling
Schineit Spiral Centrifugal Pumps boast exceptional non-clogging capabilities. Their open, large-diameter passages are highly efficient and non-clogging, making it easier to transport bulky solids and long fiber materials.
These pumps integrate the advantages of traditional centrifugal pumps and screw pumps (or positive displacement pumps) into a unique structure composed of one or two large wrap-angle open twisted blades. This design excels in its ability to handle large particles, long fibers, highly viscous, and high-concentration liquids. When conveying slurries, these pumps operate smoothly with minimal damage to the slurry, offering excellent non-destructive performance.
The heart of the spiral centrifugal pump is its impeller, which features a unique twisted helical blade design, comprising both a helical section and a centrifugal section.
The helical section generates a helical propulsion effect, with the leading edge of the impeller shaped like a sickle. The blades increase in radius along the hub, guiding the liquid flow and the conveyed objects towards the vicinity of the axis. The helical action then propels them along the axis to the centrifugal section, providing excellent suction capabilities and a lower level of cavitation.
The centrifugal section converts the impeller's energy into pressure energy within the volute casing. Due to the action of the centrifugal section, the liquid is expelled from the discharge port.
II Gentle Conveying
"Gentle Conveying" is another advantage of Schineit spiral centrifugal pumps. The solid-liquid two-phase fluid gradually moves forward with no significant abrupt changes in flow direction, resulting in a smooth, non-turbulent flow. This gentle action causes minimal damage to the conveyed objects, making it suitable for transporting live fish, vegetables, fruits, slurries, and more. It is particularly well-suited for conveying activated sludge in wastewater treatment plants, as it helps maintain the sludge's activity without causing damage.
1. In the food industry, these pumps are used for transporting delicate objects such as potatoes and live fish, which are prone to damage.
2. When conveying activated sludge or loose particles, the pumps maintain their original physical state without tearing or breaking them apart. Experiments have shown that the damage to the zoogloea in return sludge is only 10% of that caused by other types of pumps.
3. For oil in emulsions, the pumps preserve the specific physical state of the oil droplets without negatively affecting their coalescence.
4. Suspended fibers are not twisted or entangled around the impeller.
III High Efficiency, Low Energy Consumption, Lightweight, Smooth Operation, No Overload Across Entire Operating Range
→ High Efficiency, Low Cost
→ Steep Performance Curve, Stable Operating Points
→ Low Cavitation Content, High Self-Priming Capability
→ Flat Power Curve, No Overload Area Across Entire Operating Range
→ Utilizes a Low-Speed Design, Lightweight, Smooth Operation, 30% to 50% Lighter Than Similar Pumps
→ High Efficiency, Low Cost
→ Steep Performance Curve, Stable Operating Points
→ Low Cavitation Content, High Self-Priming Capability
→ Flat Power Curve, No Overload Area Across Entire Operating Range
→ Utilizes a Low-Speed Design, Lightweight, Smooth Operation, 30% to 50% Lighter Than Similar Pumps
IV Pumping of Media with High Solid Content:
Capable of conveying media with high solid content, for example, it can transport slurries with a solid content rate as high as 20%.
V Replaceable Wear-Resistant Lining, Easy Adjustment of Impeller Clearance, and Adjustable Front and Rear, Facilitating Easier Selection of Pump Installation Methods
1.Replaceable Wear-Resistant Lining
Schineit Spiral Centrifugal Pumps offer the option of equipping with wear-resistant linings, making them an ideal choice for applications requiring enhanced abrasion resistance. In the event of wear, only the lining needs to be replaced, which is a cost-effective solution as it is a small fraction of the expense of replacing the entire volute casing. Moreover, replacing the lining is extremely simple and does not require significant manpower or resources.
2.The impeller clearance is easy to adjust and can be adjusted both front and rear, facilitating easier selection of the pump's installation method. There are three methods available
1)Non-Adjustable Lining: The clearance can be conveniently adjusted by adjusting the shims.
2) Adjustable Lining: The clearance between the impeller and the lining can be adjusted using three external adjusting bolts, ensuring that the pump maintains the efficiency of a new pump during operation.
3) Motor Side Adjustment of Clearance: If the inlet piping is fixed, the clearance between the impeller and the lining can be adjusted by adjusting the motor side spiral, maintaining high efficiency of the pump.
VI The selection of high-quality components ensures low maintenance and upkeep costs.
Schineit employs bearings from internationally renowned brands such as SKF, NSK, or FAG, and utilizes high-quality special hard alloy mechanical seals, along with other top-quality components from around the world.
Bearings: SKF, NSK, or FAG
Mechanical Seals: Both stationary and rotating rings are made of hard alloy
Fasteners: SS304 or SS316L
Schineit Pumps has extensive experience in providing non-clogging and non-damaging pumping applications. We have conducted extensive and in-depth research on the requirements for various pumping applications. Through the inheritance of this experience and research and development, we have unique insights and professional knowledge in the design and hydraulic development of centrifugal pumps under different working conditions.
Schineit Pumps has developed revolutionary new methods to enhance the performance of non-clogging and non-damaging pumping, with reliable and effective hydraulic performance that can provide higher pumping efficiency and suction capacity.
Schineit Pumps has developed effective simulation tools that can quickly analyze various hydraulic designs. Our own full-scale experimental platform can test final design solutions under actual operating conditions.
Non-Clogging, Non-Damaging, High Efficiency, and Energy-Saving Schineit Spiral Centrifugal Impeller Hydraulic Advantages
In recent years, with the development of human society, the impurities contained in wastewater discharged have increasingly changed, posing new and more severe threats to the wastewater pumping operation. Long fibers, wet wipes, plastics, disposable products, fats, oils, and grease (FOG), and even human underwear as well as fish products, animal carcasses, plant branches and leaves, and various other types of waste have entered pump stations. These objects can form large clumps and stick to the impellers of the pumps, leading to clogging of the sewage pumps and causing the pump stations to be unable to drain normally, resulting in severe water pollution to the environment.
Equipped with Schineit spiral centrifugal impeller components, Schineit submersible pumps can transport general sewage as well as wastewater containing large amounts of solid particles and fibrous substances. Whether it is an open single-channel spiral centrifugal impeller or an open forward-reaching swept-back spiral centrifugal impeller, its large-channel non-clogging characteristics ensure the pumping of viscous water quality and various water qualities that require gentle transportation, and can easily cope with these challenges.
The hydraulic advantages of Schineit helical centrifugal pumps, combined with the unique benefits of FreeFlow technology.
Non-Clogging, Non-Damaging, High Efficiency, and Energy-Saving
Schineit's exceptional non-clogging technology, featuring the dolphin beak and self-cleaning end cap, has revolutionized the FreeFlow technology, significantly enhancing the hydraulic characteristics and stability of Schineit's screw centrifugal pumps. This advancement ensures that even as the demands for pumping functions become increasingly stringent due to changes in media, Schineit's screw centrifugal pumps can effectively handle media containing large solids and long fibers, as well as highly viscous and high solid content media.
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