Rotary lobe pumps types

Applications of rotary lobe pumps

Advantages of rotary lobe pumps

Types of rotary lobe pumps

Rotary Lobe pump manufacturers mainly divide their pumps into two types, food sanitary grade lobe pumps and industrial chemical grade lobe pumps.

Applications of lobe pumps

Food sanitary grade lobe pumps include, but limited to:

• Foods: Chocolate, concentrated milk, yogurt, honey, syrup, cane sugar, tomato juice, concentrated juice, jam, ice cream, milk, yeast slurry, meat slurry, jelly, condiment, lees, soybean protein, flour slurry, etc.
• Pharmaceuticals: Ointments, extract, medicine latex, pill paste, syrup, health care products, drugs,vaccine etc.

Industrial chemical grade lobe pumps include, but are not limited to:

• Consumer chemicals: AES, LAS, AOS, K12, glycerol, fatty alcohol, bathing shampoo, skin cream, shampoo, detergent liquid, toothpaste soap, washing powder slurry, etc.
• Refined chemicals: Dyes stuffs, pigments, all kinds of pulp, chemical additives, adhesives, silicone oil, leather oil, a variety of colloidal materials, etc.
• Coating: Paint, dope, printing ink, insulating paint, resin, additives and assistants, organic solvent, etc.
• Chemical fiber: Pectic slurry, PVA, spandex slurry, vinylon slurry, Acrylic slurry, polyester slice, terylence, polypropylene fiber, rayon, functional fiber, etc.
• Pulp & Paper: Polyacrylamide, calcium carbonate, starch paste, carboxyl poly, starch paste, rosin size, paper pulp, filling dry strength agent, wet strengthen agent, sizing agent, filtering agent, anti foaming agent, spreading, water treatment chemicals, etc.

Below is the table for applications

Alcohol Apple purée Apricots Baby food Batter Beans Beer Beetroot Biscuit Cream Blackcurrants Brine Broth Butter fat Caramel Castor Oil Cat food Cheese curd Cheese whey Cherries Chicken paste Chili con carne Chocolate Chutney Cockles Coconut oil Cod oil

Coffee liquor Cordials Corn oil Corn syrup Cottage cheese Cotton seed oil Cranberry juice Cream Cream cheese Custard Dog food Dough Eggs - whole Egg yolk Essences Evaporated milk Fish Flavorings Fondants Fruit juice Fruit pulp Fruit - whole Fruit yogurt Gelatin Gherkins Glucose

Glycerin Gooseberries Gravy Hand cream Honey Horseradish Ice cream Icings Iodine ointment Jams Jelly Ketchup Lard Liquid sugar Lotions Malt Maple syrup Margarine Marmalade Marshmallow Marzipan Mascara Mayonnaise Milk Mincemeat Molasses

Mousse Mussels Mustard Nail polish Nail varnish Offal Olive oil Onions Palm oil Pastes Peanut butter Pectin Perfumes Piccalilli Pie fillings Pizza toppings Plasma Potato salad Preserves Purées Quinine Rice pudding Salad dressing Shrimps Soap Solvents

Sorbitol syrup Soup Soya sauce Spirits Starches Stews Strawberries Sugar Syrup Tapioca Tea Tomato ketchup Tomato paste Tomato purée Toothpaste Vaseline Vegetables Vinegar Water Wines Wort Yeast Yogurt

Advantages of rotary lobe pumps

• High efficiency,energy-saving.
• Non-pulsating discharge, stable working.
• High temperature of 220 C degree handling (with FFKM o-rings).
• Capable of pumping mixture of gas, fluid and solid materials.
• No metal-to-metalrotorscontact,no friction andlong service life.
• Simpleand compact structure, easy maintenance and CIP/SIP capabilities
• Capable to pump the viscous material ≤1,000,000cp and pulp with the solid upto 70%.
• When equipped with frequency converter,flow rate can be adjusted and used asa metering pump.

• What is "slip"?
• Lobe pump clearances
• Pressure effect
• Temperature effect
• How viscosity affect pump sizing
• Cavitation
• Data required for rotary lobe pumps selection
• Rotary lobe pump brands andManufacturers
• Rotary lobe pump price

Lobe pump slip

Slip is the portion of the pumped product that is forced back to the suction side of the pump due to pressure through the clearances. Rotary lobe pumps sometimes do not pump the full displacement for which they are rated because of a phenomenon called slip.To allow the pump’s rotors to rotate, small clearances must be maintained between the rotors and rotorcase. Slip will change directly with pressure and clearance, and inversely with viscosity.

Lobe pump clearance

Within the casing of rotary lobe pumps there are clearances, which are the spaces between rotating components and between rotating and stationary components. Clearances are necessary to avoid rotor to rotor, rotor to rotorcase and rotor to rotorcase cover contact. The size of these clearances is related to the pressure and temperature of pump operation.

The key clearances are as follows:

• Radial clearance (between rotor tip and rotorcase).
• Mesh clearance (between rotors).
• Front clearance (between front of rotor and rotorcase cover).
• Back clearance (between back of rotor and back face of rotorcase).

Pressure effect to the pump

The design concept of the rotary lobe pump is to have no contacting parts in the pumphead. This requires having the shaft support bearings to be mounted outside of the pumphead, which results in an overhung load, caused by the rotors fitted to the shafts as shown. The effect of pressure on the rotors will cause shaft deflection, which could result in contact between rotors, rotorcase and rotorcase cover. To allow for this pressure effect, clearances are built into the pumphead between surfaces that may contact.

Temperature effect to the pump

Temperature change can be caused by the fluid being pumped, pump mechanism, drive unit and/or the environment. Any CIP (Cleaning In Place) operation required should also be taken into consideration. Changes in temperature will cause expansion upon heating or contraction upon cooling, to the rotorcase and gearcase components. The most significant result is movement between shaft and gearcase/rotorcase allowing the rotors to move forward or backward in the rotorcase. With the rotors being allowed to move forward there will be a reduction to the front clearance. To compensate for this, manufacturers will increase the clearance.

How viscosity affect pump sizing

Viscosity is a measurement of a product’s resistance to flow. Low viscosity products (e.g. water) have little resistance to flow, while higher viscosity products have a greater resistance to flow. It is key to positive pump sizing and operation because it affects slip within the pump as well as the pressure required to overcome frictional loss in the lines. Higher viscosity products smaller slip inside the pump.

How cavitation affect pump

Cavitation is the formation of vapor bubbles due to insufficient pressure at the inlet of the pump. High product temperature and/or low pressure on the inlet side of the pump can lead to insufficient pressure. Over time, cavitation can seriously damage a pump. Additional pressure energy would be required to supply the pump with the energy it requires to keep from cavitating. Four ways to increase the inlet pressure are raise the level of the product in the tank, pressurize the tank, lower the pump or decrease the product temperature.

Data required for rotary lobe pumps selection Selection

• Product Name
• Product viscosity in pump, line and at rest
• Are there any solids present
• If so what are they and percentage concentration
• Specific gravity
• Capacity required
• Pumping temperature
• Discharge pressure or sketch of pipework system
• Suction pressure or sketch of pipework system

Rotary Lobe pump brands and Manufacturers

WrightFlow, Alfa laval, Waukesha, JEC, Inoxpa, Omac, Apv, Fristam, Jabsco, Xylem, boerger, Netzsch, Johnson, Bonve

Rotary Lobe pump price

For Bonve pump price, it is offered based on the customer’s requests. Below is the main need to supply.

• Bare shaft pump or complete unit required?
• If need fixed or variable speed driving?
• Material required for the liquid contact parts, such as SS304, 316, 316L, duplex 2205 etc.
• Mechanical seal type and material required?
• If required jacket or pressure relief valve?

Bonve also can recommend a suitable proposal with the budget.

• What is a rotary lobe pump?
• How rotary lobe pumps work?
• Rotary lobe pumps parts
• Lobes types and why different need?
• Construction material of lobe pumps
• Configuration Options of lobe pumps

What is a rotary lobe pump?

Rotary Lobe Pumps are positive displacement pumps able to transferring liquids products,especially for high viscosity, high solidand arefeatured aslow shearing. Gentletransferringmakes them popularused in food, cosmetics and industrial chemicalproducers. No damage to the pumped products.

How rotary lobe pumps work?

Rotary lobe pump working principle is easy to understand. They basically consist of two lobe rotors, which rotate synchronously driven by a pair of synchronous gears in the gearbox. The rotors are driven by the main shaft and sub-shaft to rotate in a synchronous reverse direction, which changes the pump capacity, builds up high vacuum and discharge pressure, thus an efficient pumping is formed.

Parts of rotary lobe pumps

The main parts are including rotors, pump cavity, mechanical seal, shaft, bearings and gears. They are processed by CNC to ensure high precision fabrication.

Constructionmaterials of rotary lobe pumps, but are not limited to:

Product contact metal parts: stainless steel AISI 316, 316L, duplex, 904L

Mechanical Shaft Seals: Tungsten carbide, Silicon carbide

Sealing Materials of O-rings: Viton, EPDM, FFKM

Configuration of rotary lobe pumps, normal types for Bonve brand.

Lobes types and why different need

According to the different product transfer, manufacturers have different lobes design to make sure an efficient feeding and no failure, such as single-wing, bi-wing, tri-lobe, four-impeller, eight or twelve-impeller lobes. See below diagram which shows each lobes type application.

Positive displacement rotary lobe pumps and centrifugal pumps are the two main types used to transfer liquids. However, they have some distinct differences. They shows different talents when transfer liquids.The users should select with careful consideration. The following are the main differences between Positive displacement rotary lobe pumps and centrifugal pumps.

1. The difference in working principle

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A Centrifugal Pump transfers the kinetic energy of the motor to the liquid through the rotating impeller. This increases the velocity and pressure at the discharge. The discharge velocity remains constant when motor rpm is constant. On the other hand, Positive displacement rotary lobe pumps suck a fixed volume of fluid in its cavity and force it to discharge into the pump outlet. So, it is a constant volume pump. Centrifugal pumps are high capacity and relatively low-head pumps whereas positive displacement pumps are low capacity high-head pumps.

2. The Difference in fluid handling

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A. The rotation speed of rotary lobe pump is directly proportional to the flow rate. For example, when their rotation speed is 100 rpm, the flow rate is 1 cubic, while when the rotation speed is 1000 rpm, it can be understood as 10 cubic, but there is a little efficiency loss, and the flow rate is about 9.5-9.8 cubic meters.

B. The centrifugal pump throws the medium out of the flow channel of the impeller by the high-speed rotation of the motor.

C. The viscosity of medium transferred by the rotary lobe pump is relatively large, such as heavy oil, viscous adhesives, food paste, etc.; The centrifugal pump can only deliver the medium with lower viscosity, and its delivery viscosity can only be lower than 3Cst.

3. The Difference in Performance

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When you look at its performance table (Figure 1), centrifugal pumps and rotary lobe pump are quite different.

Centrifugal Pump	Positive Displacement Rotary Lobe Pump
A. Flow rate decreases with increasing viscosity	A. Flow rate insensitive to changing pressure
B. Flow varies with changing pressure	B. Flow insensitive to changing pressure
C. Efficiency decreases at both higher and lower pressures	C. Efficiency insensitive to changing pressure
D. Efficiency decreases with increasing viscosity	D. Efficiency increases with increasing viscosity

Fig. 1: Centrifugal Pump vs Rotary Lobe Pump Performance

4. The Difference in Inlet Conditions

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These two types of pumps also have quite different requirements for inlet conditions. If you encounter periods where the pump remains "dry", a rotary lobe pump will prime on its own without liquid. On the other hand, a centrifugal pump is unable to create a pressure differential by priming without liquid already in the pump.

Centrifugal vs Positive Displacement Pump: Which one to Select?

A Positive Displacement Rotary Lobe pump will be a preferred selection in the following situations:

A. For high viscous applications.

B. For variable pressure conditions.

C. For changing viscosity conditions.

D. For high-pressure applications.

E. For shear sensitive liquids.

However, these are only a few criteria. Site experience accumulation is also required for selecting the right pump. Bonve is the leading manufacturer in rotary lobe pumps since 2001. When you choose a Bonve pump, you not only get the high quality pumps, but you also get the advantage of Bonve's engineering expertise and years of application knowledge in the food, chemical, pharmaceutical and cosmetics industries.

To find out more about Bonve rotary lobe pump, Click on the picture below

The Powerhouse of Industry: Bonve Rotary Lobe Pumps

In the heart of industrial processes, where precision and reliability are paramount, lies the workhorse of fluid management: the Bonve Rotary Lobe Pump.  Designed and manufactured by Ningbo Bonve Pumps Co., Ltd., these pumps are the epitome of engineering excellence, serving a diverse range of industries with their unmatched performance and durability.

A Closer Look at Bonve's Engineering Marvel

Bonve Rotary Lobe Pumps are not just machines;  they are solutions designed to cater to the complex needs of high-viscosity, shear-sensitive, and abrasive fluids.  Let's delve into the features that make these pumps the preferred choice for industries worldwide.

Superior Design for Unmatched Performance
Precision Engineering: Each component, from the rotors to the bearings, is crafted with high-precision CNC machines, ensuring a high degree of accuracy and reliability.
Long Service Life: The pumps are designed to minimize friction, with careful attention to the between rotors and the pump casing, resulting in a long and low-maintenance service life.
Energy Efficiency: With their innovative design, Bonve pumps consume less energy while providing high transfer rates, making them an eco-friendly choice.

Versatile Applications Across Industries

Bonve pumps are not one-trick ponies;  their applications span across various sectors, including:
Food Industry: Safe and gentle handling of products like chocolate, sauces, and dairy products without altering their taste or texture.
Pharmaceutical: Reliable and precise dosing for drug manufacturing, ensuring the integrity of sensitive pharmaceutical fluids.
Chemical Processing: Effective management of high-viscosity and abrasive chemicals with ease.
Paper Industry: Efficient transfer of coatings and adhesives, contributing to the smooth operation of paper machines.

The Science Behind the Success

The working principle of Bonve Rotary Lobe Pumps revolves around the synchronized rotation of two lobe rotors, creating a vacuum and discharge pressure that effectively move the medium without causing any damage or altering its composition.
Customization to Fit Every Need
Bonve recognizes the unique requirements of different industries and offers a range of pump models to cater to specific needs:
25BV12-05 to 400BV12-400: A spectrum of models designed to handle varying flow rates, pressures, and viscosities.
Sanitary Models: Designed with hygiene in mind, these models meet the stringent requirements of the food and pharmaceutical sectors.
A Commitment to Quality and Innovation
Bonve's commitment to quality is evident in their LEAN PRODUCTION approach, where every aspect of production is meticulously controlled to ensure zero defects.  Their pumps come with a range of certifications, reflecting the company's dedication to meeting international standards.

The Bonve Advantage

Global Reach: With a presence in over 30 countries, Bonve serves a diverse clientele with tailored solutions.
Innovation: Continuously investing in R&D, Bonve has obtained numerous patents for their innovative designs.
Customer-Centric: Bonve's customer service is as reliable as their pumps, ensuring prompt and effective solutions.
Conclusion
When it comes to the backbone of industrial fluid management, Bonve Rotary Lobe Pumps stand out as the preferred choice for their robust design, versatility, and commitment to quality.  As Ningbo Bonve Pumps Co., Ltd. continues to innovate, industries worldwide can rely on their pumps to keep their processes flowing smoothly and efficiently.

How to remove and install the homogenizer mixing pump when pump ship to the destination port? Below are the tips to install Bonve high shear mixer.

1. Pump sent to area other than China will be packed in plywood case.

2. Users are advised to check the packing list, instruction manual, certificate of qualification, and other accessories attached after opening the wooden case.

3. Pump can be delivered to the installation site when the sealing bags at the inlet and outlet remain intact.

4. In hoisting, the hoist links at the pump body and the motor are available for use. If possible, users is better to carry the pumps with forklift trucks, handle with care.

5.The foundation of pump installation should have a horizontal plane. In line with the installation dimensions, four basic holes should be scooped first. Then ground screws are to be put into the holes for cement casting. When the cement is dry, use sizing block to adjust the chassis and make it horizontal. Lastly, screw up the ground bolts.

6. Pipe linking the pump should have supports respectively, which should not be the pump body.

7. To avoid damage to the pump's motor, install an overload current protection device during installation.

8. When the pump is installed, there should be a filter set ahead of the pump inlet. The filter screen should be 20 meshes or greater.

9. In installation, at pump inlet should be fixed a gauge valve for convenience of damaged meters replacement.

10. After the pump is installed, mark the ground connection point at the motor and make it connect the earth in accordance with the national safety standard.

11. If the pump is mobile type, hose should be used as at the inlet and outlet of the pump. In this case, valve and manometer are not necessary. The pump can only be pulled on level ground as four wheels (two of them are wheels) are fixed below the base plate. In case of too steep slope or a sharp turn, particular care should be taken to prevent any off-balance or sliding.

Click to view tips on installing Bonve rotary lobe pumps

Hello there! Today, let’s talk about pumps—the unsung “hearts” of industrial operations. But did you know? Not all pumps are created equal!

Thanks to two groundbreaking design innovations, our pumps deliver unmatched stability, durability, and cost savings. Let’s dive into the “secret tech” hidden in the details!



1. Bearing Design: Six-Point Support for Rock-Solid Stability!

Imagine balancing a glass of water with three fingers instead of two—wouldn’t it be steadier? That’s the philosophy behind our bearing system!

Pain Points of Traditional Pumps:

Most competitors use 4 bearings, leading to shaft wobbling, faster wear-and-tear, and frequent maintenance.

Our Solution:

Six independently placed bearings create a “triple-support” structure for each shaft:

Front-End Double Lock: Two cylindrical bearings secure radial movement, eliminating side-to-side wobble.

Back-End Powerhouse: A double-row angular contact bearing locks axial displacement, preventing forward/backward shifts.

Benefits You’ ll Love:

Zero vibration, zero pulsation—whether handling high or low pressure.

Extended bearing life boosts durability for the shaft, mechanical seal, and entire pump.

Maintenance? Barely needed! Save time, labor, and repair costs.

More details about Bonve lobe pump pls click the picture.

2. Shaft Key Design: No More Slipping, Just Seamless Sync!
Traditional pumps use shrink disks to connect gears and shafts—like glueing parts together. Under high pressure or sudden starts, gears slip or collide, causing breakdowns.
Our Innovation:
Meet the shaft key structure—a Lego-like precision fit!
Gears and shafts interlock via precisely machined keyways, ensuring perfect synchronization.
Handles high pressure, viscous fluids, and instant startups without a hiccup!
Why It Matters:
Zero collisions, zero downtime—maximize production efficiency.
Slash failure rates and keep your operations running smoothly.

3. Why Choose Us?
Stability: 6 bearings vs. competitors' 4.
Durability: Shaft keys outlast shrink disks.
Peace of Mind: Reduce maintenance costs—your team will thank you!

Final Thought:
A pump's true power lies in its hidden details. Our design isn't about flashy features—it's about making your operations faster, smoother, and hassle-free.
Next time you need a pump, ask: “Does it have six bearings and a shaft key?”

Ready to upgrade? Contact us for a tailored solution!

     Earthquake resistant engineering has evolved significantly in recent years, incorporating cutting-edge materials and technologies to enhance structural resilience. One such innovation is the application of neodymium magnets, which have emerged as a promising tool for mitigating earthquake-induced damage. These powerful rare earth magnets offer unique properties that can improve energy dissipation, damping mechanisms, and overall structural stability during seismic events.

 

Magnetic Damping Systems

 

     Neodymium magnets play a crucial role in passive damping systems, which help reduce the amplitude of seismic vibrations. Engineers have developed magnetorheological (MR) dampers, where a fluid infused with iron particles responds to magnetic fields generated by neodymium magnets. By adjusting the magnetic field intensity, the viscosity of the fluid changes, allowing real-time control over damping forces and improving a building’s ability to withstand earthquakes.

 

 

 

Magnetic Levitation for Base Isolation

 

     Another innovative application of neodymium magnets in seismic engineering is in base isolation systems. Traditional base isolators rely on rubber and steel layers to absorb ground motion. However, researchers are exploring the use of magnetic levitation, where high performance neodymium magnets create repulsive forces that suspend structures above their foundations. This system significantly reduces the transmission of seismic energy to the building, minimizing structural damage.

 

 

Energy Harvesting for Structural Monitoring

 

     Neodymium magnets are also being used for energy harvesting in earthquake-resistant buildings. By converting mechanical vibrations into electrical energy, magnetic induction systems powered by neodymium magnets can supply energy to structural health monitoring devices. These sensors help detect early signs of damage and provide real-time data to engineers, ensuring timely maintenance and safety assessments.

 

Future Prospects

 

     The use of good quality neodymium magnets in earthquake resistant engineering is still evolving, with ongoing research exploring new ways to enhance earthquake resistance. As technology advances, we can expect more cost-effective and efficient applications, improving the safety and durability of infrastructure in earthquake-prone regions. 

 

     Neodymium magnets, known for their exceptional magnetic strength and compact size, are playing an increasingly vital role in advancing space exploration technologies. Their unique properties make them indispensable in both spacecraft propulsion systems and the emerging field of space resource utilization. However, their application in the harsh environment of space also presents significant challenges.

     One of the most promising applications of high performance neodymium magnets is in advanced propulsion systems, such as ion and plasma propellers. These systems rely on strong magnetic fields to accelerate charged particles, generating thrust with high efficiency. Neodymium magnets, with their high magnetic energy density, are ideal for creating the compact yet powerful magnetic fields required. For example, in ion propellers, these magnets help confine and direct plasma, enabling spacecraft to achieve higher speeds while consuming less fuel compared to traditional chemical propulsion. This technology is particularly valuable for long-duration missions, such as interplanetary travel, where efficiency is critical.

 

 

     Another exciting frontier is the use of neodymium magnets in space resource extraction, particularly in asteroid mining. Asteroids are rich in valuable metals like iron, nickel, and rare earth elements. Neodymium magnets can be employed to separate and collect these magnetic materials in the micro gravity environment of space. For instance, magnetic separators equipped with neodymium magnets could efficiently extract iron-rich particles from asteroid weathering layer, paving the way for in-situ resource utilization (ISRU). This capability could reduce the need to transport materials from Earth, significantly lowering the cost and complexity of space missions.

 

 

 

 

     Despite their potential, super quality ndfeb permanent magnets face challenges in space applications. The extreme conditions of space, including high levels of radiation and drastic temperature fluctuations, can affect their performance. Prolonged exposure to cosmic radiation may lead to demagnetization, while temperature variations can alter their magnetic properties. Additionally, the micro gravity environment poses unique engineering challenges in designing systems that can reliably operate with magnetic forces.

 

 

     To overcome these challenges, ongoing research focuses on developing radiation-resistant coatings and advanced alloys that enhance the durability of neodymium magnets in space. Furthermore, innovations in magnetic system design aim to optimize their performance in micro gravity. As space exploration continues to expand, the role of neodymium magnets is expected to grow, enabling more efficient propulsion, sustainable resource utilization, and groundbreaking discoveries in the cosmos.

 

 

   In conclusion, powerful neodymium rare earth magnets are a key enabler of modern space exploration, offering solutions to some of the most pressing challenges in propulsion and resource extraction. However, addressing their limitations in space environments will be crucial to unlocking their full potential.

 

Where Precision Meets Innovation

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