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Correctly understand the basic working principle of Roots blower and the relationship between pressure:

Source: Roots blower manufacturer Published on: March 1, 2022 Hits:

Roots is a transliteration of English Roots. In fact, Roots blower is a kind of equipment designed and manufactured according to Roots principle. It is a positive displacement blower and has the feature of forced gas transmission. The inventor of Roots principle is the American Roots brother, Philander Roots, and Francis Roots. To commemorate this invention, So this principle is named after them. When the fan is used for positive pressure air supply, we call it a three blade roots blower. If it is used for negative pressure suction, it is called a three blade roots pump

In short, it is to use a pair of impellers to force the gas from one end to the other, so as to achieve the purpose of air transmission. This principle was proposed by the Roots brothers in the United States, so it is called the Roots principle. The blower made with Roots principle is called Roots blower. At first, the rotors of Roots blower were a pair of two blade rotors, but now they are basically three blade roots rotors, which has greatly improved in noise, vibration and other aspects. But the basic principle remains the same.

Basic principle of Roots blower

Roots blower

Roots blower is a double rotor compression machine. The axes of the two rotors are parallel to each other and driven by the prime mover through a pair of synchronous gears to rotate at a constant speed in opposite directions. Roots blower is a displacement fan, and the air volume delivered is proportional to the number of revolutions. Two impellers suck and exhaust three times every time the three blade impeller rotates. Driven by the synchronous gear, the air is transported from the air inlet of the fan to the exhaust side along the inner wall of the shell.

Pre intake principle of Roots blower

The pre inlet compression method is mainly proposed to improve the return flow impact characteristics of fans. During the movement of the elementary volume (the enclosed space between the impeller and the casing and wall panel) from the air inlet to the exhaust port, high-pressure gas is introduced into the interior of the casing or wall panel through the air guide orifice, so that before the elementary volume is connected with the exhaust port, its internal pressure gradually reaches or approaches the balance with the pressure of the exhaust port.

Explanation of Roots blower pressure

First of all, Roots blower has no pressure when idling. The pressure of Roots blower is actually the length of the connecting pipe. Diameter. Elbow. When resistance is generated by factors such as, the resistance of the pipeline at this time will feed back to the working chamber of the large roots blower. At this time, when the pipeline pressure exceeds the pressure of the roots blower itself, the noise of the roots blower will become larger. Heating, motor tripping and serious case may burn out roots blower. In short, it is easy to understand that the Roots blower can overcome the pressure: it can overcome the pressure of 15kpa, and the selection pressure of Roots blower is 15kpa

Explanation of Roots blower structure and pressure

Since the pressure of Roots blower is below 58.8kpa, it is a single tank Roots blower. When the pressure exceeds 58.8kpa and is below 98kpa, it uses double tanks. Therefore, the pressure of Roots blower directly determines the main structural form of Roots blower. When the pressure exceeds 98kpa, the roots blower needs to use two-stage series roots blower to increase the pressure of roots blower. The pressure difference of 200kpa can be achieved by using two-stage series connection.

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