High pressure fan

Under the design conditions, the air blower with a wind pressure of 30kPa to 200KPa or a compression ratio of e=1.3 to 3 belongs to the category of high-pressure fans. At present, the industry generally regards the air ring vacuum pump as a high-pressure blower. High-pressure blower, also called high-pressure blower, is different from general centrifugal high-pressure blower.

The history of the development of high pressure fans has a long history. For many years in China, China had created a simple wooden grain windmill. Its principle of operation is basically the same as that of modern centrifugal fans. In 1862, the British Guibel invented a centrifugal fan. Its impeller and casing were of concentric type. The casing was made of brick. The wooden impeller used backward straight blades. The efficiency was only about 40%. It was mainly used for ventilation in mines. In 1880, people designed a volute casing for the ventilation of mine shafts and a centrifugal fan with backward curved blades. The structure has been perfected.

In 1892, France developed a cross-flow fan; in 1898, the Irish designed a Siro-type centrifugal fan with forward blades, which was widely used by various countries; in the 19th century, axial fans were used in blasting in the mine ventilation and metallurgical industries. However, the pressure is only 100 to 300 Pa and the efficiency is only 15 to 25%. It did not develop until the 1940s.

In 1935, Germany first used axial-flow isobaric fans to ventilate and induce wind; in 1948, Denmark made axial-flow fans with movable blades in operation; rotary-axial fans, meridian-accelerated axial-flow fans, diagonal-flow fans, and Cross-flow fans have also been developed.

According to the direction of gas flow, fans can be classified into centrifugal, axial flow, oblique flow, and cross flow types.

When the centrifugal fan is working, the power machine (mainly the motor) drives the impeller to rotate in the volute casing, and the air is sucked from the center of the impeller through the suction port. Due to the dynamic action of the blades on the gas, the pressure and speed of the gas are increased, and the centrifugal force is thrown along the blade path toward the casing and is discharged from the exhaust port. Because the flow of gas in the impeller is mainly in the radial plane, it is also called a radial fan. With the progress and development of the times, people are not content with the pressure and air volume requirements of centrifugal air pumps, and the noise of centrifugal air pumps has increasingly become a headache within the factory. Therefore, Japan first introduced a fully enclosed flow measurement fan, which is today's high pressure fan (vortex vacuum pump). This fan, for its first time, met the needs of society at the time for high-pressure fans with its fine appearance and noise. Later, this fan was upgraded successively, and the high-pressure fans of the single-stage, double-stage, and three-stage impellers were successively developed. The maximum pressure of the high-pressure fan was once refreshed to 230kpa, but this was only used as the ultimate pressure of the fan. At this time, the fan has shown a hundred schools of thought, and the performance is more eye-catching: Germany's Siemens, Hong Kong Glory, Kim Gori, and some South Korean brands. In 1983, wind turbine technology was introduced to Hanover, Germany, to create today's world-renowned high-pressure high-pressure fan, high-pressure high-pressure blower quickly set off in the domestic wind turbine environmental climax, with its strong capital and technology, reasonable product prices, and improve after-sales The service system has won the trust of many domestic and foreign companies, and has become the designated product of many large enterprises (Coca-Cola, Chinese Academy of Sciences, Jiabao Group, Uni-President, Union Lihua, the Fourth Engineering Bureau of China Ministry of Railways, China Shipbuilding Industry Corporation, etc. ). Up to now, the application of high pressure fans has been popularized. It is widely used in industry and agriculture, covering infrastructure, environmental protection industry, automotive industry, electroplating industry, aquaculture, industrial dust collection, packaging machinery industry, printing machinery industry, plastics Industrial, chemical, food, pharmaceutical, medical, electrical and electronics, light industrial textiles, ships and railways, and aerospace engineering make our world more environmentally friendly.

The working principle of the high-pressure fan When the impeller 3 rotates, due to the effect of the centrifugal force, the wind vane causes the gas to move forward and outward, thereby forming a series of spiral movements. The air between the impeller blades rotates helically and rotates. The gas outside the pump body is forced into the side slot (inhaled through the suction port 1). When it enters the side channel 2, the gas is compressed and then returned to the impeller blade. Between the accelerated rotation again. As the air passes through the impeller and the side slots along a spiral track, each impeller blade increases the degree of compression and acceleration. As the rotation progresses, the kinetic energy of the gas increases, so that the gas pressure passing through the side channels further increases. When the air reaches the connection point of the side slot and the discharge flange (the side channel narrows at the outlet), the gas is extruded out of the vane and exits the pump through the outlet muffler 4 .

High-pressure fan features In general, the high-pressure fan has the following characteristics:

1, with blowing and suction dual function, a dual-purpose machine, you can use suction, you can also use the hair; there is a high pressure fan 4HR high pressure high pressure fan, you can also use the suction and blowing, the equivalent of a rotary vane vacuum pump Function

2, less oil or no oil operation, the output of the air is clean;

3, compared with centrifugal fans and medium-pressure fan, the pressure is much higher, often more than ten times the centrifugal fan, for example, there is a model 4HR630H67 high-pressure high pressure fan, the output pressure up to 70KPA;

4. If the pump body is integrally die-casted and shock-proof mounting feet are used, then the requirements for the installation foundation are also very low, and even the fixed feet can be used to operate normally, which is very convenient and saves installation costs. And installation cycle

5, compared to other types of fans, such as Roots blower, the operation of the noise is low, the greater the more obvious the power, above 5.5KW will be displayed;

6, maintenance-free use; its loss parts are only two bearings, within the warranty period, basically do not require maintenance;

7. The mechanical wear of the high-pressure blower is very small, because there is no other mechanical contact part except the bearing, so the service life is of course very long. As long as it is under normal conditions of use, it is completely free from 3 to 5 years. of. Gao Rui high-pressure fan even proposed a limited one-year replacement, three-year warranty of premium services;

8, easy to install, easy to use!

Precautions for the selection of high-pressure blowers The use of high-pressure blowers is very extensive because of the complexity of their selection. In general, you need to follow these two steps:

1, need to determine the site is the use of high-pressure fan what function is suction or blowing, identify the corresponding high-pressure fan pressure - flow curve; if you look at the wrong curve, sometimes resulting in the selected product can not be used;

2. Based on the calculated pressure and flow rate, find the working curve above the working point corresponding to the pressure and flow at the same time on the graph; then select the high-pressure fan model according to the working curve;

As long as it is a different work site, its demand for pressure and flow is not the same. Therefore, in order to obtain relatively accurate data, relevant calculations are needed. This needs to be done by a professional designer or a professional company.