Roots blower are also called positve displacement blower.According to the impeller contour it can be divided as bi-lobe roots blower and tri-lobe roots blower. Roots blower operates by pumping a fluid with a pair of meshing lobes.Fluid is trapped in pockets surrounding the lobes and carried from the intake side to the exhaust.. The most common application of the roots blower is as an air source in water treatment plant,smoke desulphurization,pneumatic transmission,aqualculture,paper making industry etc.Roots blower is more suitable for gas transportation and pressurization systems in low-pressure occasions. It can also be used as a vacuum pump, etc.

Products Details

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Description of Roots blower

Composition

Roots blower mainly consists of five parts: casing, wall panel, impeller, oil tank and silencers.

Casing: mainly plays the role of support (wall panel, impeller, silencer) and fixing

Wall panel: mainly used to connect the casing and the impeller, to support the rotation of the impeller, and to have the effect of end face sealing

Impeller: It is the rotating part of the Roots blower. It is divided into two lobes and three lobes. However, due to the advantages of slighter air pulsation, lower noise and smoother operation of three lobes roots blower, the three lobes have gradually replaced the two lobes Roots blower.

Oil tank: mainly used to store lubricating oil used to lubricate gears and bearings

Silencer: to reduce the noise caused by airflow pulsation

Features:

Our products adopt the brand-new design concept, and the part types are reduced by 30%, the appearance of the parts is exquisite, simple and capable. What’s more, the actual strength is increased substantially.

Due to the three-blade rotor structure and the reasonable structure of the air inlet and outlet in the casing, the blower has smaller vibration and lower noise.

The impeller and shaft are precisely processed, and the impeller clearance is precisely maintained. The performance of the blower remains sturdy which can run continuously for a long time at various conditions.

The blower has a large volume utilization rate, high volumetric efficiency, compact structure and flexible installation methods.

Complete models can meet the needs of different users for different purposes.

Roots blower operating conditions

1. The inlet steam temperature of the conveying medium is usually not greater than 40℃.

2. The content of particles in the medium shall not exceed 100mg/m3, and the maximum size of particles shall not exceed half of the minimum working clearance.

3. During operation, the bearing temperature shall not be higher than 95℃, and the lubricating oil temperature shall not be higher than 65℃.

4. The operating pressure shall not be higher than the boost range specified on the nameplate.

5. The clearance between the impeller and the casing, the impeller and the side plate, and the impeller and the impeller of the Roots blower has been adjusted before leaving the factory, and the clearance should be guaranteed when reassembling.

6. When the Roots blower is running, the oil level of the main fuel tank and the auxiliary fuel tank should be between the middle of oil level gauge.

Application of Roots blower

WHAT INDUSTRIES HAVE ROOTS BLOWER APPLICATIONS?

● Roots blowers are essential in many bulk material handling and dust collection systems ：

CEMENT INDUSTRY roots blower for phenumatic system convey in cement industry，Raw meal, cement, kiln dust, limestone and coal powder are pneumatic conveyed using roots blowers. They are used to blend raw meal, cement and blow air into kilns and burners for combustion.	CHEMICAL AND PETROLEUM INDUSTRY Roots blowers are used to transport or compress many inert, corrosive and explosive gases in chemical plants and refineries. Roots blowers are used in regenerative drying systems to provide ultra-clean and dry air. They are used in pressure and vacuum modes in fixed and portable systems.

WASTEWATER TREATMENT Roots blowers are used to aerate raw sewage and industrial organic waste. The aeration drives the digestion of the waste by microorganisms. Roots blowers are also used for grit tank cleaning, filter flushing, backwashing and the recovery of gases. Oil-free roots blowers are used for deep cell aeration.	BIOGAS RECOVERY AND RECIRCULATION Biogas is referred to as 'digester' or 'landfill' gas. It is made up of methane with small amounts of hydrogen sulfide and other trace gases. Biogas, which is explosive and corrosive, is generated in wastewater treatment plants. Roots blowers are used to transport biogas to where it is burned off or recirculated to fuel combustion engine-driven machines.

VPSA System VPSA（Vacuum Pressure Swing Adsorption）is a non-cryogenic gas separation technology that uses special solids (adsorbents) as molecular sieves to segregate the Nitrogen and Oxygen from the mixture of air. Roots Blower and Vacuum Pump are the main equipment for the VPSA system.	Melt Blown Cloth fabric Meltblown fabric belongs to non-woven fabric and industrial textiles，the main raw material is polypropylene particles.Roots blower transports plastic particles to the feeder by setting corresponding air pressure and air volume, the hot air with high temperature, high speed and high pressure is ejected to form melt blown nonwovens.

Types and classification methods of roots blower

1.According to the transmission mode,RH roots blowers are assorted as V-belt diven roots blower and direct coupling roots blower

V-belt driven roots blower

The roots blower and motor are connected through V-belt. The motor transfers power to blower through V-belt. The blower rotation speed can be adjusted by using different size of pulleys. The pressure boost can up to 98kpa at maximum. The impeller adopts advanced

optimised countour, with perfect meshing, less leakage and high efficiency.Accessories include common base, belt cover, blower pulley, motor pulley,V-belt, pressure gauge, air inlet silencer, air outlet silencer, anchor bolts, check valve, elastic joint, gear oil etc.

Direct coupling roots blower

Direct-drive three-lobe roots blowers are mostly used in high-temperature industries such as the steel industry to avoid belt slippage caused by high temperature.

For direct drive roots blower, the rotational speed of the main shaft is determined by the rotational speed of the motor. If the rotational speed of the motor is fixed, the rotational speed of the main shaft is constant. For motors of the same level, the rotational speed is fixed and cannot be adjusted at will. Relatively speaking, the maintenance of direct-drive blowers requires professional and technical personnel to operate.For direct coupling roots blower,due to no lateral force on the blower shaft, and the transmitted power can be very large and more efficient.

2. According to the cooling method: RH roots blowers are assorted as air-cooled roots blower, water-cooled roots blower.

Air cooling roots blower

The common cooling methods of roots blowers are water cooling and air cooling. Air cooling means that no other cooling devices are needed. In the case of low pressure, the blower can transmit heat through the air and cool down naturally. The characteristics of this type of roots blower are: low pressure and simple structure.The operation is simple and efficient. Two identical lobes rotate in opposite direction in the casing. During the rotation air flows into the space between the lobes and the casing and is let through the pump to the outlet. When the tip of the lobe opens to the outlet there is a pressure equalisation backwards into the pump.

Water cooling roots blower

When the pressure ratio is large, if the air cooling method is adopted, the exhaust temperature will be relatively high. At this time, cooling water can be used for forced cooling of the gas. There are two types of water cooling:

A.The jacket is cooled by water. The casing and the wall panel are made into a jacket structure, and cooling water is passed through to force the compressed gas to cool when in use.

B.Water injection for cooling. A small amount of water is injected into the casing from the air inlet, which can not only cool the exhaust gas, but also seal the rotor gap. Mainly wet vacuum pumps use this cooling method.

3.According to their working methods,roots blowers can be roughly divided into single-stage and double-stage . Among them, there is only one compression stage blower, which we call a single-stage blower, and two single-stage blowers are connected in series. A blower that performs two compressions is called a two-stage tandem blower.Most cases the one compression stage blower is more common in industries.

One compression stage blower

The one stage compression roots blower pressure boost can up to 98 kpa at maximum,If more pressure boost needed, we will consider two-stage tandom blower.We manufacture highly-developed standard products for the most diverse range of applications that are used in all branches of industry. Our machines are high-performance, economical and extremely durable.

Two-stage tandem blower

The two-stage Roots blower is composed of two standard water cooling roots blowers connected in series. When the air flow enters the first-stage blower for boosting, the gas temperature is cooled down below 40℃ by the intercooler, the cooled air then enters into the second-stage blower to continue boosting. The maximum boost pressure of the unit can reach 160kPa.

4.Submersible roots blower

Submersible Roots Blowers are applied to underwater, so there will be not much noise. Submersible roots blower feature strong structure and lower energy consumption. the power of Submersible Roots Blowers is from 2hp to 20 hp, and can be applicable to pressure boost.

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5.Stainless steel roots blower

Comparing to cast iron steel roots blower, the stainless steel roots blower are more sturdy and expensive due to material and production cost. The blower case and impeller are adopted stainless steel, which is more rigid and suitable for harsh working environment.

Stainless steel roots blower are mostly for transporting process gases which are corrosive or toxic, such as hydrogen sulfide, biomethane,landfill gas, carbon monoxide etc.

6.Roots blower package

Regarding to noise control of roots blower,aerodynamic noise is dominant and the hazard is the greatest, which is the key consideration in the process of noise control.The noise intensity and spectral characteristics of the roots blower are not only related to the working static pressure of the blower, but also related to the flow rate and speed of blower. According to the characteristics of the noise generated by the roots blower, the control of its noise mainly adopts the technologies of sound insulation, noise reduction, sound absorption and wrapping. , paste sound-absorbing materials, spray damping materials on the blower surface, use sound-insulating doors and windows, etc.

7.Smart control roots blower package

R-BOX Intelligent Online Roots Blower, a municipal science and technology planned product, was developed to optimize the acoustic environment and control experience. Detachable remote control cabinet, real-time monitoring of working parameter as pressure rise, vibration, flow volume and temperatue etc. Positive pressure dust-free silencing room design, efficient heat dissipation, noise prevention, and more stable operation.

Failures and Elimination Method

Roots blower failure and reason, involves using conditions and operating conditions factor, very difficult for simple words to clarify its causes and elimination methods, need to be analyzed according to actual situation after elimination, table provided "fault and exclusion", only of common fault and elimination methods .

Failure appearance	Reasons	Elimination Method
Insufficient flow	1.Increase clearance caused by the blade and body friction	1.Change the worn part
	2.The fit clearance is changed	2.Adjust upon request
	3.System leakage	3.Check and eliminate
	4.The belt is not tight enough and the belt wheel slips	4.Tighten the belt
Overload of the Electric motor	1.System pressure change
	A. The filter screen of the input is blocked, or some other reasons make the resistance increased and then the negative pressure created (the differential pressure of the air input and air output increases while the output pressure does not change.)	Check and eliminate
	B. The systematic pressure of the output is increased	Check and eliminate
	2.Occurred by the abnormal parts
	A. The static and dynamic rub	Adjust clearance
	B. Gear damage	Change
	C. Bearing damage	Change
	Overheat	1.Machine body
	A. The pressure increased	Check and eliminate
	B. Because the input gas temperature is increased	Check and eliminate
	C. The static and dynamic rub	Adjust the clearance
	2.Bearing
	A. Bearing damage	Change
	B. Lubricating oil: lubricating oil is not enough or is too much	Adjust the oil mass
	C. The temperature of the lubricating oil is too high or the oil quality is not good	Change the clean and good lubricating oil
	3.Lubricating oil
	A. The cooling water breaks or is insufficient	Check, eliminate or adjust
	B. Abnormal gear action or gear damage	Check, eliminate or adjust
	C. Bearing damage	Change
	D. The lubricating oil is not good	Change
Friction between impellers	1.The output rim and the fastener of the gear hub become loose and offset, δ1 is out of tolerance	Adjust the clearance, positioning and retighten
	2.Tooth surface wears so the tooth clearance increased and then leads to clearance change between the blades	If badly worn ,it should changed, if not badly worn, adjust it
	3.Gear hub key and blade key become loose	Change the
	4.Driving and driven bearing is over bent.	Straightening or change the bearing
	5.Impurities sneak into the machine body or medium deposit	Clear the impurities or Deposit
	6.Anti-friction bearing worn, the backlash enlarged.	Change the bearing
	7.Operation with over rate pressure	Find out the reason for over pressure and then eliminate
Racial friction between Impeller and the enclosure	1.Clearance δ2 is out of tolerance	Adjust
	2.Anti-friction bearing wear, the backlash enlarged.	Change the bearing
	3.Driving and driven bearing is over bent.	Straightening or change the bearing
	4.operation with over rate pressure	Find out the reason for over pressure and then eliminate
Friction between Impeller and wallboard	1.clearance δ3δ4 is out of tolerance	Adjust
	2.There are some impurities between the blade and the wallboard or Medium deposit	Clear the impurities or deposits
	3.Anti-friction bearing wear, the backlash enlarged.	Change the bearing
Over shake	1.Low balance quality of the rotor	Adjust
	2.The rotor balance is damaged	Check and eliminate
	3.Bearing wear or damage	Change
	4.Gear damage	Change
	5.Foundation bolt or other fastener become loose	Check and then tighten it
	6.Coaxiality of the air blower and the motor is out of tolerance	Find out the right coaxiality
Gear damage	1.Overload operation or bears abnormal impact	Change
	2.The lubricating oil is to less or not good	Change
	3.Gear wear, and the side clearance exceeds 1/3 of the blades clearance	Change
Bearing damage	1.Lubricating oil or grease is not good or the lubricating oil or the grease is not enough	Change
	2.Exposures the corrosive gas (coal gas) because of the ineffective gas seal, so the bearing is damaged in short time	Change the bearing and recover the gas seal
	3.Long-term overloaded operation	Change
	4.Surpass the rated operating life	Change
Oil leakage of shaft seal	1.Reinforced seal ring is wore and ineffective	Change the Reinforced seal
Oil leakage of shaft seal	2.The coaxiality of the driving bearing and the motor bearing offsets too much so the seal becomes ineffective ahead of time	Change the seal ring and adjust the coaxiality of the air blower
Oil leakage of the drain plug	1.The oil plug is not screwed tight	screw tight the oil plug
Oil leakage of the drain plug	2.The gasket of the oil plug is damaged	Change the gasket of the oil plug and fasten it

Successuful exhibition

Company Info.

Nantong Rongheng Environmental Equipment Co.,Ltd. is a state-level high-tech enterprise specialized in manufacturing environmental protection equipment and integrating R&D,manufacturing ,sales and technical services.Leading products mainly include Roots type blower,Air foil suspension blower,MVR compressor,Multistage centrifugal blower,Rotary blower etc. With technical competence,advanced design methods,state of the art processing equipment,our products has successfully broken through the high energy consumption and big noise bottleneck ,which making us outstanding in this industry.

Rongheng provide high-quality industrial blower and vacuum pumps specialized for water treatment, gas delivery,and other related industries. We also provide engineering solutions for industrial noise control, waste water treatment design and construction.

Our two brand are RH and Hengrong respectively

As for now, we have customers from Argentina, Russia, Brazil, Mexico, Costa Rica, Peru,Pakistan, India, Vietnam,Sri Lanka, South Africa, Mardagascar etc.

Nantong Rongheng Environmental Equipment Co., Ltd is .We have accumulated almost 30 years hands-on experience and we can offer a wide range of standard products but distinguish ourselves by providing custom solutions with minimal additional cost. Rongheng’s commitment is to provide the right product for your application supported by our innovative team of engineers.

Products Description

1) Delivery in time

√ Over almost 30 years manufacturing experience in roots blower, plus automatic equipment and reliable production management, we can control each step of manufacturing exactly and accurately.

Our factory is located in Nantong city, Jiangsu Province,one of the 14 first coastal open cities in China.Nantong is adjacent to Shanghai,the largest port of China, plus our accumulated fully shipping resources,it is very convenient for us to ship goods to our customers. By ways regardless of sea, air, land or even rail transportation, so as to guarantee delivery of your goods in time.Nantong Rongheng Environmental Equipment Co., Ltd. is a manufacturer with 118 employees; Our company was founded in

2009, located in No.666 Fengcheng New Street, Yudong Town, Haimen, Nantong, Jiangsu, China.Our company occupies an area of more than 9,000 square meters, and we have passed ISO9001:2015, ISO14001:2015 certification.

2) Easy payment way

We accept T/T, Western Union, and other payment ways upon your convenience.As so far, the most payment way customers used with us will be the T/T,which is quick and safer.

3) Full quality control

√ For each order, from the materials to whole production and delivering process,we will take strictly quality controlling.

√ First, for all materials we purchase for production must pass the CE,ISO 14000certificated,so as to guarantee its safety during your using.

v Second, before goods leaving factory,our QC team would implement the rigorous inspection together with the third inspection party to ensure the goods quality for you.

√ Third, for shipment, we will book vessels, finish goods loading into container or truck,ship goods to the seaport for you, all by ourselves for the whole process, so as to make sure its safety during transportation.

√ Last, we’ll offer clear loading images and full shipping documents to our customers,to make sure you know clearly every step about your goods.

4) Professional customization ability

√ We have rich OEM experience for B2B business.we have accumulated extensive experience cooperated with overseas sourcing and purchasing, including wholesaler, distributors, end users

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