Centrifugal fans can be used in a wide range of applications. They can be used not only as induced draft fans in production enterprises, but also as fans in many public facilities. However, centrifugal fans in different applicable environments have different specifications, models, parameters, performances, etc. In addition to the introduction of technicians, you can also determine the model displayed on the nameplate of the fan. What does the model of the centrifugal fan mean? What is its naming method?
1)The meaning of the centrifugal fan model
In China, the fan industry has clearly stipulated the model of the centrifugal fan, and it is also named according to the model on the nameplate. The model content of the centrifugal fan includes six parts: name, model, machine number, transmission mode, rotation direction and outlet position. The contents are arranged in the order shown in the figure below.
The model naming method of centrifugal fans is not uniform at home and abroad. For example, the forward centrifugal fan with a large number of blades is called the Sirocco type; the centrifugal fan with wide blades and strong backward direction is called the Buffalo type. Some are named after the flow rate and pressure generated by the fan. For example, the BM40/730 type refers to the BM type centrifugal fan with a flow rate of 4000 (ie 40×1000) m³/h and a pressure of 97325Pa. It is also named after the geometric parameters of the impeller. For example, the 07-160 type refers to the centrifugal fan with the ratio of the inner diameter to the outer diameter of the impeller D1/D2=0.7, and the installation angle of the blade outlet is 160°.
2)the model naming example of centrifugal fan
In order to help you fully understand the various meanings of the models on the centrifugal fan nameplate, the following centrifugal fan manufacturers take the Y4-73-11No18D right 90° centrifugal fan as an example to illustrate its naming method.
1. Name: It refers to the use of the centrifugal fan, which is expressed by the first character of the Chinese Pinyin alphabet of the use word. For general-purpose fans, it is omitted and not written. The letter “Y” in this example represents the boiler induced draft fan and the “G” stands for the boiler blower.
2. Model: It consists of basic model and supplementary model. It is divided into three groups, separated by a horizontal short line in the middle. The basic model occupies two groups, which are expressed by multiplying the pressure coefficient of the centrifugal fan by 10 and the specific speed (taking two integers). If the fan has two impellers in series structure, its pressure coefficient is expressed as 2×pressure coefficient. The supplementary model occupies one group, which indicates the air intake form and product design serial number of the centrifugal fan. In this example, “4” represents an integer formed by multiplying the pressure coefficient of the centrifugal fan by 0.43 by 10, “73” represents the specific speed of the fan, and the previous number “1” in “11” means that the fan adopts a single-sided The air intake structure, the second number “1”, means that the fan is designed for the first time.
3. Machine number: It is expressed in decimeters of the diameter of the impeller of the centrifugal fan, and the mantissa is rounded up. No. is used before the number. m.
4. Transmission mode: The “D” in this example means cantilever support, which is driven by a coupling.
5. Direction of rotation: The word “right” in this example means that the impeller rotates clockwise when viewed from one end of the prime mover, which is customarily called right-handed.
6. Position of air outlet: “90°” in this example means that the position of air outlet is at 90°.
In addition to the above content, the common pressure coefficient and specific speed in the model are abbreviated model, such as 4-73 type ventilator.
