Roots blower is needed to replace centrifugal fan, what brand is good quality and low price

Before I have been doing environmental protection in Japan, every project is used to fan, centrifugal fan, axial fan, rotary type, roots fan are often used, roots fan and centrifugal fan is relatively familiar, a few years ago back to China set up an environmental protection company, I talk about the use of these years, I don't know how many roots fan manufacturers there are, but we have used a lot of brands, relatively good, Hunan Changsha long drum, Jiangsu Pepsi, Shandong Zhanggu, Jingong, etc., Taiwan also has a few good. Among them, Peshide fans and Jingong roots fans are more worth buying, comparatively speaking, cheaper, and the quality is also good!

Let's talk about the difference between centrifugal fans and roots fans.

1. The working principle of centrifugal blower When the motor rotates and drives the fan impeller to rotate, the gas between the blades in the impeller also rotates, and the gas is thrown out under the action of centrifugal force, the gas flow rate increases, so that the gas converts kinetic energy into static pressure energy in the flow, and then with the pressurization of the fluid, the static pressure energy is converted into velocity energy, and the gas is discharged through the exhaust port, and a certain negative pressure is formed in the middle of the impeller. Under the action of continuous rotation of the impeller, the gas is continuously discharged and replenished, so as to achieve the purpose of continuous air blasting. At the same power, the wind pressure and air volume are generally inversely proportional. Under the same power, if the wind pressure is high, the air volume will be relatively low, and if the air volume is large, the wind pressure will be lower, so as to make full use of the power efficiency of the motor.

2. The working principle of roots blower and roots blower Working principle: Ci fan is a positive displacement fan, the air volume conveyed is proportional to the number of revolutions, and the three-lobe impeller is sucked and exhausted three times by two impellers every time it rotates, compared with the two-lobe type, the gas pulsation becomes less, the load change is small, the mechanical strength is high, the noise is low, and the vibration is small. Two three-bladed impellers are arranged on the shafts of two horizontal rows, and a small gap is always maintained between the wheel and the inner hole surface of the oval chassis and each impeller, and because the impellers rotate at a uniform speed in the opposite direction of each other, a certain amount of gas surrounded by the box and the impeller is transported from the side of inhalation to the side of discharge.

Each impeller is always kept in the correct phase by the synchronous gear, and there will be no contact with each other, so it can be high-speed, does not require internal lubrication, and has a simple structure, stable operation, stable performance, and is suitable for a variety of purposes, and has been used in a wide range of fields.

To put it simply: under the same power, the centrifugal fan has a large air volume and low pressure, while the roots blower has a high pressure and a small air volume.

Pressure: Air compressor, roots blower, centrifugal fan.

Air volume: centrifugal fan, roots blower, air compressor.

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The centrifugal fan has a large air volume and low pressure, while the roots blower has a high pressure and a small air volume.

1. Roots blower is a positive displacement blower. The roots blower separates the air inlet by the "meshing" of a pair of rotors, which are driven by a pair of synchronous gears that move in the opposite direction to compress the inhaled gas and push it from the suction port to the exhaust port. When the gas arrives at the exhaust port, the pressure is increased by the return of high-pressure gas on the exhaust side, and the gas is transported.

2. The centrifugal fan uses a high-speed rotating impeller to accelerate the gas and convert the kinetic energy into potential energy (pressure), so as to complete the gas transportation.

3. The working principle of roots fan and centrifugal fan is different, and the basic structure of the fan is also different.

1. The working principle is different, the centrifugal fan uses curved blades, which rely on centrifugal force to throw the gas to the casing, while the roots fan uses two figure-8 blades, the gap between them is very small, and the gas is squeezed to the outlet by the extrusion of the two blades.

2. Due to the different working principles, generally their working pressures are different, the outlet pressure of the roots fan is relatively high, while the centrifugal fan is relatively small.

3. The air volume is different, generally the roots fan is used in the place where the air volume requirement is not large but the pressure requirement is high, while the centrifugal fan is used in the place where the pressure requirement is low and the air volume requirement is large.

4. The manufacturing accuracy is different, the roots fan requires high precision and strict assembly requirements, while the centrifugal fan is relatively loose. Of course, there are some small differences.

5. If the load needs a constant flow effect, use a roots blower. Because the roots blower belongs to the constant flow fan, the main parameter of the work is the air volume, and the output pressure changes with the change of the pipe and load, and the air volume changes very little. The roots blower is a high-pressure blower, and the roots blower is a positive displacement blower, which conveys the air volume proportional to the number of revolutions, and transports the gas from the inhaled side to the discharged side.

If the load requires a constant pressure effect, a centrifugal fan is used. Because the centrifugal fan belongs to the constant pressure fan, the main parameter of the work is the wind pressure, and the output air volume changes with the change of the pipeline and load, and the wind pressure does not change much.

6. Centrifugal fan, the wind pressure is not large. The compression of air is usually carried out by centrifugal force through several working impellers (or stages). Centrifugal fans belong to the square torque characteristic, while roots fans basically belong to the constant torque characteristic.

The roots blower is a positive displacement fan, the air volume conveyed is proportional to the number of revolutions, and a small gap is always maintained between the end face of the impeller and the front and rear end covers of the fan and between the fan impeller, and the wind is transported from the air inlet of the fan along the inner wall of the shell to the discharged side under the drive of the synchronous gear. The inner cavity of the fan does not need lubricating oil, high efficiency and energy saving, high precision, long life, compact structure, small size, light weight, easy to use, the product is widely used, all over the petrochemical, building materials, electric power, smelting, fertilizer, mining, port, textile, food, papermaking, aquaculture and sewage treatment, environmental protection industry and many other fields, mostly used to transport air, can also be used to transport gas, hydrogen, acetylene, carbon dioxide and other flammable, explosive and corrosive gases.

The third floor is very detailed, you can take a closer look.

First, the nature is different.

1. Centrifugal fan: It is a driven fluid machinery that relies on the input of mechanical energy to increase the pressure of gas and transport gas side by side.

2. Roots fan: It is a volumetric fan, with the end face of the impeller and the front and rear end covers of the fan.

Second, the principle is different.

1. Centrifugal fan principle: according to the principle of converting kinetic energy into potential energy, the gas is accelerated by a high-speed rotating impeller, and then decelerates and changes the flow direction to convert kinetic energy into potential energy (pressure). In a single-stage centrifugal fan, the gas enters the impeller from the axial direction.

As the gas flows through the impeller, it flows radially and then into the diffuser.

In the diffuser, the gas changes the direction of flow, and the increase in the cross-sectional area of the pipe reduces the gas flow, so that the kinetic energy is converted into pressure energy. Pressurization occurs mainly within the impeller, followed by the diffusion process. In a multistage centrifugal fan, the air flow is returned to the next stage impeller, creating a higher pressure.

2. Roots blower principle: The space where there are two three-bladed impellers rotating relative to each other is sealed by the shell and the wall. Since each impeller adopts involute or cycloid envelope, the three blades of each impeller are the same, and the two impellers are the same, which greatly reduces the difficulty of processing.

When the impeller is processed, numerical control equipment is used to ensure that the two impellers can maintain a certain minimum clearance no matter where they rotate, and ensure that the gas leakage is within the allowable range.

Third, the characteristics are different.

1. Characteristics of centrifugal fan: Centrifugal fan is essentially a variable flow constant pressure device. When the rotational speed is constant, the theoretical pressure flow curve of the centrifugal fan should be a straight line.

Due to the internal losses, the actual characteristic curve is curved. The pressure generated by a centrifugal fan is greatly affected by changes in inlet temperature or density.

2. Roots blower characteristics:

1) Due to the three-bladed rotor structure, the inlet and outlet structure of the casing is reasonable, and the vibration and noise of the fan are low.

2) The impeller and shaft are integral structures, and the impeller is wear-free. The performance of the fan remains unchanged and can be operated continuously for a long time.

3) The fan has the characteristics of large volume utilization, high volume efficiency, compact structure and flexible installation mode.

4) All kinds of machines can meet the needs of different users for different purposes.

To put it simply, the centrifugal fan has a large air volume, but the capacity of forced air supply is not enough, and the pressure is about 1kpa.

The roots blower can force air into the pipe, and the pressure is below 100kpa, and the air can be forced into it.

The centrifugal fan is similar to the electric fan in the home, although the air volume is large, but it does not blow far.

No, roots blowers belong to positive displacement blowers.

Two pairs of trefoiled rotors mesh with each other to produce other incoming pipes.

Roots blower. Centrifugal fan.

Axial fans.

Roots blowers are neither centrifugal nor axial blowers.

Roots blowers belong to positive displacement rotary fans.

Because roots blower, also known as roots blower, is a positive displacement rotary blower, which uses two or three blade-shaped rotors to compress and transport gas in relative motion in the cylinder. This blower has a simple structure and is easy to manufacture, suitable for gas transfer and pressurization in low-pressure occasions, and can also be used as a vacuum pump.

Want to purchase roots blower consult the number of 136, then 7636 and finally 3376

Therefore, the roots blower is neither a centrifugal blower nor an axial blower.