These points must be considered when choosing a rotor lobe pump

The basic requirements of the lobe rotor pump device are performance and life. Performance is the parameters of the cam rotor pump: head, flow and efficiency. Life is the total number of hours of operation before one or several parts must be replaced while maintaining allowable performance. Mainly the characteristics of structural materials under actual operating conditions.
First of all, emulsion pump manufacturers must consider the corrosion resistance of the lobe rotor pump, erosion or a combination of the two. When selecting the materials of the process components of the lobe rotor pump, the factors that need to be considered are; user experience, expected pump life, intermittent or continuous use, and conditions for the lobe pump to pump harmful or toxic liquids or liquids.
The corrosiveness of liquids is different due to one or more of the following conditions: temperature, concentration. Purity, speed. Mixed solids and gases. Stainless steel usually refers to the chromium content. Corrosion of the medium: The material has a certain range of corrosion resistance to the medium. Electrochemical corrosion; the same metal material is used in the entire flow channel of the rotor pump. Medium temperature: The material is brittle at a very low temperature. Creep occurs at high temperatures; a certain material can withstand the corrosion of a certain medium at room temperature. But it is not necessarily resistant to the corrosion of the medium at high temperature, so the material properties should meet the requirements of the temperature of the medium conveyed by the cam rotor pump
.
lobe rotor pump manufacturers and suppliers

The structure of the rotor lobe pump

The structure of the rotor lobe pump

The lobe rotor pump is mainly composed of rotor, a pair of synchronous meshing gears, mechanical seal, pump body, pump body end cover, transmission box, transition disc, two transmission shafts, flanges, couplings and other parts.

The driving mode adopts a variable-speed motor or a fixed-ratio geared motor or the user selects the supporting device according to his own needs, so as to smoothly adjust the output flow in a larger range. The rotor shaft is mounted on a pair of tapered roller bearings that can bear the axial load. The gear pair is installed in a gear box with an oil sump. The gear box and the pump body are separated from each other, and a certain distance apart, the oil in the gear box will not mix with the medium in the pump body.

The machining accuracy of the rotor is relatively high, and different materials such as cast iron and stainless steel are used according to the transmission medium. The shaft seal at the pump body adopts a precise balanced or unbalanced mechanical seal. The synchronous gear and the box body are generally made of structural steel and cast iron respectively. The drive shaft is made of medium carbon steel.
Rotor lobe pump manufacturers and suppliers

Advantages of rotor lobe pump

Comparison of rotor lobe pump and centrifugal pump
The delivery flow of the rotor lobe pump can be controlled more accurately. The output flow of the centrifugal pump cannot be accurately controlled, and it decreases with the increase of body resistance. Rotor pumps have strong self-priming ability, and centrifugal pumps must be filled with liquid before rotating.
As the viscosity increases, the flow rate of the centrifugal pump decreases and the power increases. For the rotary pump, on the one hand, as the viscosity increases, the internal leakage decreases, the volumetric efficiency increases, and the flow rate increases, so that the efficiency of the pump increases, and the power decreases. On the one hand, the increase in viscosity increases the frictional resistance of the liquid, which in turn reduces the efficiency of the pump and slightly increases the power consumption. However, in general, the efficiency of the rotor lobe pump is improved for the delivery of larger viscosity liquids.

The speed of the rotor lobe pump is generally low, generally between 200r/min and 400r/min. The conveyed material is output smoothly without damage to its components; while the centrifugal pump has good efficiency at a specific speed. And the conveyed material is subjected to strong impact and centrifugal force, so the centrifugal pump often produces the phenomenon of inconsistent material composition when conveying the mixture, which reduces the quality of the finished product. The rotor lobe pump is the best choice to solve this problem, so it is especially suitable for conveying mixed materials and even materials containing solid particles. The rotor lobe pump can be used for conveying substances with high viscosity. The centrifugal pump does not have this feature. Rotor pumps can be conveniently made into varieties with higher output pressure, which are suitable for long-distance or high-resistance quantitative transportation.

Comparison of rotor lobe pump and screw pump

Both are positive displacement pumps, so their performance is basically similar. It can stably convey high-viscosity substances and has a higher conveying pressure. However, the screw pump has a big shortcoming that determines its inapplicability: the non-streamlined surface of the screw pump, the numerous defects in the chamber, and the direct contact between the screw and the bushing determine its short life. And there is a gap between the rotor and the pump casing. The streamline structure of the rotor and the rotor chamber basically have no dead spots and non-metallic parts. It is easier to transport high-viscosity media and has a longer service life.

Notes on the use of rotor lobe pumps

Notes on the use of rotor lobe pumps:
When we use the SAIKEN rotor lobe pump, there are many places that need to be paid attention to, so what are the places that need to be paid attention to, let us take a look together.
First of all, what we need to do before we start, we have to check whether the oil in the gear box is enough, and the lubricating oil should be replaced regularly. The general replacement time is when it has been used for about four thousand hours. Before starting, you must open the inlet and outlet gates of the pipeline. When the medium enters, you need to turn the rotary lobe pump by hand. After confirming that it is normal, it can be run officially, and it cannot be run when the pump is empty.
There is also the need to pay attention to the rotor pump during operation. When it is running, we must pay attention to the power of the motor and the running condition. If there is an abnormality, stop the operation to find the cause. The pump body sealed with packing can allow one to three drops per minute. If it exceeds, the material ring should be tightly pressed. The mechanical seal should be free of leakage and heat generation.
Rotor lobe pump manufacturers and suppliers

The structure and working principle of the lobe rotor pump

Working principle of SAIKEN lobe rotor pump:
The rotor pump is a positive displacement pump. It is simply explained. The conveying medium depends on the pressure difference of the atmospheric pressure, and the medium does not contact the inner wall of the pump. It can meet the technological requirements that require high pressure, high viscosity, and strong self-priming. Our professional term is called Working condition requirements.
lobe rotor pump structure:
The internal disassembly diagram of the lobe rotor pump is simple in structure. According to different industry applications, the materials of some of the components will change accordingly.
The structure and working principle of the cam rotor pump:
In the petroleum and petrochemical industry, we choose fluororubber to deal with dirty oil media; we choose EPDM for methanol
In the municipal industry, to deal with activated sludge, we choose rubber
In the chemical industry, processing solutions, we choose 304L or 316L stainless steel
To prevent leakage, we also need to be equipped with mechanical seals.
lobe rotor pump casing:
The cam pump casing is made of ductile iron, which can be used for general oil, sewage, and municipal sludge in the petroleum and petrochemical industry. In special industries, we will use stainless steel pump casings.
Pump cover:
The cam rotor pump cover is an easy-opening pump cover, that is, when replacing the wearing parts, the entire pump body and the motor do not need to be separated, and the pipeline does not need to be removed, which can save time and operating costs.
In general, the rotor pump has a compact structure and a small footprint, which is advantageous compared to a screw pump.
Compared with centrifugal pumps, rotor pumps do not require priming, can allow short-term dry operation, are self-priming and stable, and have a suction stroke of up to 8.7 meters. They are used in the selection of mobile pump trucks and the integrated cam rotor pump for unloading and sweeping warehouses. The selection is based on advantages.
lobe rotor pump manufacturers and suppliers

The lobe rotor pump has a wide range of applications

The lobe rotor pump has a wide range of applications SAIKEN cam rotor pumps are used in a wide range of industries, and the application areas are:Chemicals for daily necessities: AES, LAS, AOS, MES, K12, glycerin, sorbitol, shower gel, skin cream, shampoo, hand soap, toothpaste, soap, washing powder slurry, etc.

Fine chemicals: fuels, pigments, various slurries, chemical additives, adhesives, silicone oil, leather oil, various colloidal materials, etc.

Food: chocolate, condensed milk, yogurt, honey, syrup, cane sugar, tomato juice, concentrated fruit juice, jam, ice cream, milk, yeast slurry, meat slurry, jelly, condiments, wine trough, soy protein, flour slurry, etc.

Papermaking: Polyacrylamide (PAM), calcium carbonate, starch paste, acrylic latex, rosin, rosin glue, pulp, filler, dry strength agent, wet strength agent, sizing agent, retention and filter aid, defoamer, Coating, water treatment chemicals, etc.

Chemical fiber: viscose porridge, PVA, vinylon pulp, spandex pulp, polyester chips, polyester, polypropylene, man-made fibers, functional fibers, etc.

Medicine: various plasters, extracts, medicated emulsions, pill pastes, syrups, health care products, medicaments, etc.

Coatings: paints, coatings, inks, insulating varnishes, resins, urgency, organic solvents, etc.
Rotor lobe pump manufacturers and suppliers

Rotor lobe pump operation steps

Before starting the rotor lobe pump, open the water gate valve and the pump exhaust valve plug, close the outlet gate valve, and fill the pump cavity with water so that the rotor lobe pump can start normally;

Jog the motor. From the motor side, check whether the steering is in the direction indicated by the arrow.
The operation of the lobe pump:

After the rotor pump is started, gradually open the outlet gate valve and adjust to the required working condition point;

During the operation of the rotor lobe pump, the flow at the operating point should be no greater than the flow at the large flow point given in the performance parameter table. At the same time, the current when the motor is running must not exceed the rated current.

Stop sequence: close the gate valve-motor-pressure gauge on the outlet pipeline　
Maintenance of rotor lobe pump:

Frequently check whether the rotor lobe pump is stable during operation, whether there is mechanical seal wear and leakage, and replace the seals in time to prevent pressure water from entering the motor

Frequently check the temperature change of the motor shell, the maximum cam temperature should not exceed 85 degrees, if the temperature is too high, it should be shut down immediately for inspection;

When the rotor lobe pump is out of service for a long time, drain the accumulated water, remove the embroidered dirt, and apply anti-rust grease for the next use.
Rotor lobe pump manufacturers and suppliers

Material selection of rotor lobe pump

There are four material options for SAIKEN rotor lobe pumps.
Rubber-coated materials, stainless steel, copper, and steel materials, among which rubber-coated materials and stainless steel materials are more commonly used. From the perspective of the maturity of the application process, the medium containing sewage, dirty oil and particulate matter in the petroleum and petrochemical industry is suitable for rotor lobe pumps with rubber-coated rotors.
This type of rotor is distinguished from the choice of material. According to the chemical characteristics of the medium when the cam rotor pump is selected, it can be divided into three types: fluorine rubber, nitrile rubber, and EPDM. These three rubber rotors have many practical applications and stable performance, which fundamentally solves the customer’s application problems. There is another point on how to choose the three kinds of rubber materials. From the outside, the rubber is all the same color. How to distinguish it.
Let us take fluorine rubber and nitrile rubber as examples. There are three main points intuition from the color: Viton is reinforced with carbon black with a large particle size, so the color is gray, and nitrile rubber is reinforced with N770 carbon black with a small particle size, so the color is black and bright. From the perspective of specific gravity: the specific gravity of fluorine rubber is 1.9, and the specific gravity of nitrile is 1.3. Combustion method: fluorine rubber will not burn and has a light odor; nitrile rubber will burn and has a strong odor.
The cam rotor pump relies on two synchronous anti-rolling rotors to generate suction (vacuum) at the inlet during the rotation, and then suck the material to be transported. The two rotors divide the rotor chamber into several small spaces, and work according to the order of ABCD; when working to position A, only chamber I is filled with medium; when it is in position B, part of the medium is closed in chamber B. When in position C, chamber A Part of the medium is also closed in the middle; when it reaches the position D. Room A and Room B communicate with Room II, and the medium is transported to the discharge port.
feature of product
Pump rotor: choose nano-composite wear-resistant rubber rotor, resistant to dry work, idling for more than 60 minutes, the pump body is sturdy and durable, long life; anti-air resistance skills: self-priming height can reach 9 meters, horizontal self-priming can reach more than 100 meters , No need for drainage tank pump. The gas-liquid self-adaptive integrated box can effectively eliminate the gas resistance and cavitation in the process of pumping (100 meters self-priming), so that the pump equipment has the functions of pump and compressor for gas and liquid transport.

Gas-liquid two-phase sealing skills: use special mechanical seals developed by well-known domestic mechanical seal experts. The sealing surface has a common structure, smooth and abundant, no air resistance, and sufficient cooling medium convection, which can effectively avoid dry grinding, high temperature, cracking, and failure of the sealing surface. Ensure that the pump unit is working properly. No clogging, strong flowability: general plastic bags, woven bags, sand, mud, hair and other sundries will not affect the operation of the pump.
Integrated integrated control system: The embedded system selected by the project develops an intelligent control system to complete intelligent monitoring.
The structure of the lobe rotor pump is completely symmetrical, so the delivery direction of the pump is reversible. Especially in the petroleum and petrochemical industry’s product oil loading and unloading truck stations, tank bottom oil sweeping pump stations, this feature is very useful and can help customers solve cost problems.
Rotor lobe pump manufacturers and suppliers

Scope of application of rotor lobe pump

Rotary lobe pumps are used to transport many media. Foods include rice milk, flour milk, honey, syrup, eight-treasure porridge, hot pot base, hot sauce, sweet noodle sauce, maltose, chocolate, peanut butter, sesame sauce, etc.
Japanese products include shampoo, laundry detergent, facial cleanser, hand cream, lotion and so on. There are other medicines, petroleum jelly, glucose and so on.
We will select the appropriate model rotor lobe pump according to the viscosity of different materials and the required flow rate. The material is made of 304/316L stainless steel, and the round steel is directly CNC processed, which is truly sanitary. The reducer can be equipped with a gear reducer and a stepless speed regulating motor. According to the requirements of the working conditions, you can choose whether to use a speed regulating motor. There are stepless speed regulating motors and variable frequency speed regulating motors. The cam rotor pump is suitable for transporting high-viscosity, soft particles, gas-liquid-solid mixed colloidal materials, and effectively guarantees that the physical and chemical properties of the materials will not be changed, and the quality of the original materials will not be affected.
Rotor lobe pump manufacturers and suppliers

Application advantages of rotary pump

Saiken rotor lobe pump is a positive displacement pump. According to the working principle, some manufacturers call it a lobe rotor pump, some are called a piston rotor pump, and some are called a rotary piston pump, a spiral rotor pump, a rotary lobe pump, a positive displacement pump, anyway They are all rotor pumps.
In fact, the lobe rotor pump is a general term for a series of pumps, which is not specific. Many pumps also have rotors, such as screw pumps.
The application of the lobe rotor pump started from the municipal sewage plant and then extended to the petroleum and petrochemical industry. It multi-processes solid, liquid and gas mixed media and has the characteristics of wear resistance and corrosion resistance. The reason is that the rubber-coated rotor of the lobe rotor pump.
Rubber-coated rotor, according to the physical and chemical properties of different media, there are fluorine rubber, nitrile rubber, EPDM rubber, hydrogenated nitrile rubber to choose from. We are roughly divided into the following categories.
Fluorine rubber: oily sewage, refined oil, weak acid and weak alkali
Nitrile rubber: activated sludge of sewage treatment plant
EPDM: methanol unloading truck, ethanol unloading truck
This is a rough classification. For example, flocculants, activated carbon, benzene, sulfide, fecal sewage, etc., can all use rubber rotors.
The wide range of media that can be handled is the basis for the universal application of rotary pumps, and there are other advantages:
1. Easy maintenance
The casing of the lobe rotor pump is lined with a protective lining plate. After the pump is found to be worn out, the axial lining plate can be replaced. The maintenance process is not as troublesome as other pumps, and it can be replaced without removing the pipeline, motor, and opening the pump cover. Generally speaking, the service life of wearing parts is about 2 years, so the entire maintenance cost is reduced
2. High efficiency and low energy consumption
The rotor lobe pump has high efficiency, stability, no pulsation, no vibration, the power of the motor used is reduced, and the energy consumption of long-term use is greatly reduced.
3. Small footprint
Therefore, the characteristics of the lobe rotor pump are shown together through various aspects, and the advantages are greater than other pump types. With more and more market promotion, the overall sales price is also falling. Therefore, the main advantage of the lobe rotor pump is to efficiently help customers solve problems while reducing energy consumption and other costs.