发布时间：2022-06-30 15:11:06 人气：87 点赞：0
Answer: there are many differences between Roots blower and screw blower in the blower industry, such as the following three statements!
Difference between screw fans and roots fans in the industry I:
Compared with roots blower, screw blower has higher initial purchase cost than roots blower for products with the same air volume; However, in terms of energy consumption and maintenance cost, screw blower is lower than roots blower. And this advantage will become more significant with the increase of equipment pressure and use time. It can be seen from the following dimensions
1. Maintenance frequency: Roots blower is frequent, screw blower is low
2. Deployed quantity: Roots blower: one for standby and one for use, or two for use and one for standby, as appropriate; Screw blower, n+1
3. Energy consumption cost: Roots blower is high; Screw blower: starting from 0.5bar pressure, the energy-saving effect of internal compression increases with the increase of pressure
4. Operation time: Roots blower has large pulse and high temperature. It is generally used conservatively for about 8 hours to switch to the standby machine; Screw blower structure is equipped with heat dissipation jacket, with low operating temperature and 24-hour operation.
5. Purchase cost: Roots blower has low unit price and large quantity; Screw blower: the unit price is high and the purchase quantity is small.
Difference between screw fan and Roots fan II:
Roots blower and screw blower are both positive displacement fans. If they want to PK, it can be simply attributed to the different compression principles. Screw blower has more prominent advantages in energy saving, stability and low noise.
During the operation and air delivery of Roots blower, the volume of the cavity between rotors does not change. The pressure comes from the forced delivery of a large amount of air into an external cavity with a relatively small volume, such as a pipe or an air storage tank. The density of the air in the external cavity continues to increase, resulting in pressure, which is usually called "external compression". Roots blower has simple structure, forced air supply (the air supply volume is not affected by the exhaust pressure), and does not generate pressure by itself.
The working principle of the screw blower is somewhat different from that of the roots blower. The air is also sucked in and then discharged. When inhaled, the cavity between the screw and the screw is large. With the rotation of the screw rotor, the cavity volume will gradually become smaller. When the gas is discharged, the cavity volume will become very small. That is to say, in the process of rotation, it is equivalent to 2M ³ The air pressure is reduced to 1m ³ In other words, the pressure rise does not come from the peripheral pipe network, but from the change of the internal cavity of the host cavity, that is, the so-called internal compression.
Screw blower is an extension of traditional roots blower and screw blower. It has the characteristics of forced air supply of traditional roots blower. Screw blower has certain self compression and achieves ultra-high volumetric efficiency through excessive suction. The power consumption of internal compression used by twin-screw blower is far lower than that of external compression used by roots blower. In addition, the internal compression process is continuous and progressive, and the air flow pulsation is lower than that of Roots blower, Therefore, the noise and stability of screw blower are better than roots blower.
The third difference between screw fan and Roots fan:
Roots blower and screw blower are very different. They are similar to each other. They both have positive pressure and negative pressure classification!
1. Different origins
Roots blower originated in the United States, screw blower originated in Germany.
Screw fan was first proposed by German h.krigar in 1878. It was not until 1934 that a.lysholm of the Swedish Royal Institute of technology established this technology and began to be applied in industry.
2. Rotor difference
At present, the most popular design of Roots blower rotor in the market is involute linear design, while the rotor of screw fan is linear design.
3. Different pressure ranges
The pressure range of single-stage roots blower widely used in the market is 9.8 to 98kpa, and the pressure range of double-stage roots blower is 98kpa to 198kpa. Pressure range of screw fan: 0.3~1.2bar
4. Different working principles
During the operation and air delivery of Roots blower, the volume of the cavity between rotors does not change. The pressure comes from the forced delivery of a large amount of air into an external cavity with a relatively small volume, such as a pipe or an air tank. The density of the air in the external cavity continues to increase, resulting in pressure, which is usually called "external compression".
The working principle of the screw blower is somewhat different from that of the roots blower. The air is also sucked in and then discharged. When the air is sucked in, the cavity between the screw and the screw is the largest. When the gas is discharged, the cavity volume will become very small, that is to say, in the process of rotation, it is equivalent to 2m? Is reduced to 1m? At the same time, the pressure increases to 1bar, that is, the pressure increase does not come from the peripheral pipe network, but from the change of the internal cavity of the compressor.
In a word, roots blower has price advantage and screw blower has efficiency advantage! How to choose specifically depends on the consumer bosses!
Ruizhe environmental protection specializes in the production and sales of Roots blowers! If you need to order roots blower, please consult our online customer service or call the hotline!