Roots Blower

Roots Blower

A roots blower, also known as a positive displacement blower or a twin-lobe blower, is a type of mechanical device that is used to move air or gas. It consists of two lobed rotors that rotate in opposite directions within a casing, which causes air or gas to be drawn into the blower and then forced out of the discharge port.

The operation of a roots blower is based on the positive displacement principle, which means that a fixed amount of air or gas is moved for each rotation of the rotors. This makes roots blowers highly efficient and capable of generating high flow rates, making them well-suited for use in a variety of industrial applications, such as pneumatic conveying, wastewater treatment, and power generation.

One of the advantages of roots blowers is that they can operate at high pressures and maintain a constant airflow, which makes them ideal for use in applications where a consistent supply of air or gas is required. They are also relatively easy to maintain, as they have few moving parts and require minimal lubrication.

However, one of the drawbacks of roots blowers is that they can generate significant levels of noise and vibration, which can be problematic in certain applications. Additionally, they may not be as energy-efficient as other types of blowers, such as centrifugal blowers, in certain operating conditions.

Roots Blower Manufacturers

There are several manufacturers of Roots blowers, also known as positive displacement blowers. Here are some of the popular ones:

1. Dresser Roots – Dresser Roots is one of the oldest and most well-known manufacturers of Roots blowers, with over 160 years of experience. They offer a wide range of models and sizes, including oil-free and high-pressure blowers.
2. Tuthill – Tuthill is another well-known manufacturer of Roots blowers, offering both oil-free and oil-lubricated models. They also have a range of accessories and parts to support their blowers.
3. Howden – Howden is a global engineering company that produces a range of industrial equipment, including Roots blowers. Their blowers are used in various applications, including wastewater treatment, pneumatic conveying, and power generation.
4. Kaeser – Kaeser is a German company that produces a range of compressed air systems, including Roots blowers. Their blowers are designed to be energy-efficient and offer low noise levels.
5. Gardner Denver – Gardner Denver is a global manufacturer of industrial equipment, including Roots blowers. They offer a range of oil-free and oil-lubricated models, as well as custom solutions for specific applications.
6. JD VACUUM SERVICE – Roots blower manufacturers suppliers in India. We are into full-fledged manufacturing of a good range of Twin Lobe Root blower Exhausters. Over a period of time, we have developed a series of Twin Lobe Root blowers having unmatched quality & performance. Root blower manufacturers and suppliers in Ahmedabad, Gujrat, India

Root blower working principle

A root blower is a type of positive displacement blower that operates by trapping a volume of air between two meshing lobes or rotors and then transporting that air from the inlet to the outlet of the blower.

The two rotors in a root blower are shaped like Number 8 of English and are mounted on parallel shafts. The lobes rotate in opposite directions so that as they turn, they trap a volume of air between them and carry it from the inlet to the outlet of the blower. The rotors are synchronized by timing gears to ensure that they mesh correctly and to minimize air leakage.

The air trapped between the rotors is compressed as it is carried from the inlet to the outlet of the blower. Compression is not as efficient as in other types of compressors, but it is sufficient for many applications.

Root blowers are commonly used in applications where a high volume of air needs to be moved at relatively low pressures. Examples include wastewater treatment, pneumatic conveying, and ventilation. They are relatively simple in design, durable, and can be operated continuously without overheating.

Why is the rotary lobe blower called a “Root Blower”?

The term “Root Blower” is a common name for a type of positive displacement blower known as a “rotary lobe blower.” The name “Root” comes from the two brothers, Philander and Francis Marion Roots, who invented this type of blower in the 19th century.

The Root brothers developed the first positive displacement blower in 1860 to ventilate mines. Their design consisted of a pair of intermeshing lobed rotors that rotated within a housing, creating pockets of air that were carried from the inlet to the outlet of the blower. This design proved to be a significant improvement over existing ventilation methods and quickly became popular in the mining industry.

Over time, the Roots brothers’ design evolved and was refined, but the name “Root Blower” stuck as a common name for any positive displacement blower that used a similar design.

Today, the term “Root Blower” is still used colloquially to refer to a variety of positive displacement blowers that use rotary lobe technology. However, it’s worth noting that “Roots” is actually a registered trademark and that not all rotary lobe blowers are manufactured by the Roots company.

How does a “Root Blower” operate?

A Root Blower, also known as a Positive Displacement Blower or a Roots-type Blower, is a type of mechanical blower used to move air or gas by trapping a volume of fluid between two meshing lobed rotors that rotate in opposite directions within a housing.

Here’s how it operates:

Air or gas is drawn into the blower through the inlet port, which is typically located on the side of the housing.

The rotors, which are shaped like figure-eights, begin to rotate in opposite directions. As the lobes on each rotor pass each other, they trap a volume of air or gas between them.

As the rotors continue to rotate, the trapped air or gas is carried around to the other side of the housing, where it is forced out through the outlet port.

As the air or gas is forced out, a partial vacuum is created behind the rotors, which draws in more air or gas through the inlet port to repeat the process.

The rotation of the rotors is driven by an external power source, such as an electric motor or a gasoline engine. The speed of the rotors can be controlled by adjusting the speed of the power source, allowing the blower to be used for a wide range of applications that require different flow rates and pressures.

Roots-type blowers are commonly used in industrial applications such as wastewater treatment, pneumatic conveying, and ventilation systems. They are also used in some supercharger systems for internal combustion engines to increase their power output

What is the JD VACUUM SERVICE “Blower” series composed of?

The JD VACUUM SERVICE “Blower”; called JDVC, is composed of three conjugate lobe-shaped rotors that rotate inside a
pre-machined chamber. The chamber is sealed by the rotating rotors, and the rotors are synchronized by means of a
timing 1:1 gear ratio, positioned at the end of the shafts.

All Bearings are positioned externally to the compression chamber with an oil-lubricated system. The driveshafts
have labyrinth-style oil seals, so-called because of the labyrinth of grooves that the oil must pass through. The
splash guard lubrication system uses a fine mist of oil for lubrication.

Roots Blowers Compressors

These Root Blowers compressors are designed in such a way that they same can have vertical or horizontal airflow. Further, the Roots blower working with its standard accessories is being supplied together compact unit which makes it very easy to put in. It is also available as a bare machine for replacement. Roots blower working principle pdf.

Roots Blower Pump

These Roots Blowers pumps are tested for performance as per BS-1571 Part II to work out capacity, pressure, and power consumption. Stringent internal control tests are administered at each stage of production and every unit is given a test run lasting several hours under increased load.

Twin Lobe Roots Blower

These Twin Lobe Roots Blower Pressure is Air Cooled Machines and is capable to develop pressure up to 1 kg./Cm2 & for
vacuum duty up to 0.6 kg/cm2. Two-stage machines are often offered for pressure up to 2.2 kg/cm2. The Blower is
being manufactured in 10 different models to cover the suction capacity ranging from 70 M3/hr to 7000 M3/hr. blower
for aquaculture As per the required suction capacity and pressure requirement, a suitable model of the Blower price
can be offered.