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Roots blower

A positive-displacement lobe pump that works by pumping a liquid with a pair of mesh lobes resembling a set of elongated gears. Fluids get stuck in the pockets around the lobes and are transferred to the exhaust from the inlet. The most common use of a Roots blower blower is in induction engines in two-stroke diesel engines, such as those produced by Detroit Diesel and Electro-Motive Diesel. Root blowers are also used to supercharge the motors of the ironing cycle. The blower is driven from the engine crankshaft by a toothed belt or V, roller chain or gear train. Root blower blower called inventors and The American brothers Philander and Francis Marion Roots, the founders of the Roots Blower Company of Connersville, Indiana, USA, were named in 1860 when they patented the original design as an air pump for use in blast furnaces and other industrial applications. In 1900, Gottlieb Daimler patented a Roots-blower-style blower, making it the oldest Root-blower blower available. Root blowers are commonly known as air blowers or PD (positive displacement) blowers, and can be called “Huffers” if used with gasoline engines in custom hot rod cars.


Root blower blower is simple and widely used. Positive inlet manifold pressure (ie above atmospheric pressure) at low engine speeds can be an alternative to superchargers, making it a popular choice for passenger car applications. Maximum torque can be achieved at about 2000 rpm. Contrary to popular belief, most modern Roots blower chargers have three-lobed or four-lobed rotors. This allows the lobes to have a slight torsion along the axes of the rotor, which reduces the pulse at the input and output (this is impractical with two lobes, because Even a small twist can open a free path through the supercharger at certain angles). Accumulated heat is an important point in the operation of the compressor in the internal combustion engine. Of the three basic types of superchargers, root design has historically had the worst thermal efficiency, especially at high pressure ratios. According to the ideal law of gas, a compression operation raises the compressed outlet temperature. In addition, the operation of the compressor itself requires input energy that is converted to heat and can be transferred to the gas through the compressor chamber and cause it to heat up more. Although intercoolers are mostly due to use in They are known as turbochargers, but superchargers may also benefit from the use of an intercooler. Internal combustion is based on a thermodynamic cycle, and lower temperatures from the received charge lead to greater thermodynamic expansion and vice versa. One hot charge causes an explosion in a gasoline engine and can melt the pistons in a diesel, while a cooling step is more complicated but can improve production power by increasing the input charge. Forgive, just as the engine has a higher capacity. An intercooler with heat loss (power) introduced by compression,Reduces the thermodynamic efficiency, but increases the available power due to the increase in working mass per cycle. Above about 5 psi (35 kPa) the recovery between coolants can be dramatic. [Citation needed] Using a Roots blower supercharger is one successful way to add a thin heat exchanger between the blower and the motor. The water circulates through it to a second unit located near the front of the car, where a fan and air flow can dissipate the accumulated heat. The Roots Bluer design was commonly used in two-stroke diesel engines (by the department Detroit diesel [trucks and buses] and Electro-Motive [railroads (known as General Motors)), which need some kind of forced induction because there is no separate consumption. Rootes’ two-stroke diesel engine used in the Kamer and Carrier cars had a Roots blower. These two companies are not related. The superchargers used in premium fuel engines, funny cars, and other dragsters, as well as hot rods, are actually derivatives of General Motors Coach Division blowers for their industrial diesel engines that are used for drag racing. Have been adapted. The model name of these units determines their size – the blowers, typically used from 4–71 and 6–71, are designed for 71 Series diesels. Current competition tractors use post-GMC variants in a design similar to the 71 Series, but with increased rotor length and added capacity. Hot rods also use 6-71 reproduction. Root blowers are commonly used in applications where large volumes of air must be transported through a relatively small pressure differential. This includes low vacuum applications, with Roots blower blowers alone or in combination with other pumps as partIt’s a lot of a vacuum system. It is one of the most common industrial applications in pneumatic transmission systems,  the air blower provides a large amount of air to move bulk solids through the pipes. Some civil defense sirens used Roots blower blowers to pump air to the rotor (helicopter) to dramatically increase its sound output across all pressure ranges. The most famous of these are the Federal Thunderbolt Series Signal and the ACA (Current American Signal Company) Storm. These sirens are known as “supercharged sirens”. Root crystals are also used to reverse the flow of gases or liquids, for example, in gas meters in reverse.

Technical topics

The simplest form of a Roots blower blower has cycloid rotors made of alternating tangential sections of hypocycloid and epicycloid curves. For a two-lobed rotor, the smaller production circles are a quarter larger in diameter. Real Roots blower blowers may have more specifications to increase efficiency. The lobes on one rotor with the least amount of free play do not drive the other rotor in all positions, so a separate gear pair provides staging of the lobes. Because rotary lobe pumps require a distance between the lobes, a single-stage Roots blower blower can pump gas in just one Pump limited pressure differential. If the pump is used beyond its specifications, the gas compression produces enough heat so that the lobes expand to the point where they are sealed and damage the pump. Root pumps are capable of pumping large volumes, but since they achieve only moderate compression, it is not uncommon to see several stages of Roots blower blowers, often with heat exchangers (internal coolers) to cool the gas. Lack of oil in the pumping surfaces makes the pumps work in environments where pollution control is important. The high pumping speed for hydrocarbons allows the Roots blower pump to Establish an effective separation between oil pumps, such as rotary compression pumps, and the vacuum chamber. It uses a type of claw-shaped rotors for higher compression. The Roots blower blower can achieve almost 70% efficiency by achieving the maximum double pressure ratio. Higher pressure ratios are achievable but with reduced efficiency. Because a Roots blower blower pumps air in discrete pulses (unlike a screw compressor), the sound of pulses and turbulence may be transmitted downstream. If not properly managed (through the outlet pipe geometry) or calculated (by structural reinforcement of downstream components), the resulting pulses can cause fluid cavities or damage to downstream components of the blower.

Roots Bluer Performance Map

For each type of Roots blower blower that operates under certain conditions, a point is placed on the map. This point increases with increasing speed and moves to the right as the blower speed increases. It can be seen that, with medium speed and low gain, the efficiency can be more than 90%. This is the area where Roots Blu-ray crystals were originally supposed to work, and they do very well in this area. The increase in pressure ratio is the ratio of the absolute air pressure before the blower to the absolute air pressure after compression by the blower. If there is no increase, the pressure ratio will be 1.0 (meaning 1: 1), because the outlet pressure is equal to the inlet pressure. 15psi amplification is specified for the reference (slightly higher than the pressure ratio of 2.0 compared to atmospheric pressure). With an increase of 15 psi (100 kPa), Roots blower blowers are suspended between 50 and 58%.Replacing a smaller blower with a larger blower moves the dot to the left. In most cases, as the map shows, this shifts it to more efficient areas on the left because The smaller blower on the right side of the graph is probably working faster. Usually using a larger blower and operating it more slowly to achieve the same boost will increase the compressor efficiency.
The volume efficiency of the Roots blower blower is very good, it is usually more than 90% in total, but it is the lowest blower speed. For this reason, a low-efficiency blower will still mechanically deliver the desired volume of air to the engine, but the air will be warmer.In drag racing programs, where a large amount of fuel is injected with hot air, the fuel vapor absorbs heat. It acts as a kind of liquid after-cooling system and largely negates the efficiency of the Roots blower design in that program.

Related terms:

The term “blower” is commonly used to describe a device that is placed on engines with a functional need for additional airflow using a direct mechanical link as an energy source. The term blower is used to describe different types of superchargers.Screw type supercharger, Roots blower type supercharger and centrifugal supercharger are types of blowers. Conversely, a turbocharger, using exhaust compression to rotate its turbine, rather than a direct mechanical connection, is generally not considered a “blower” but a “turbo”.