40 Hp Air Compressor

The permanent magnet motor remains high efficiency at low speeds, ensuring obvious energy-saving advantages in small air volume

-Frequency range from 0%-100%(common conversion from 60%-100%)

-Compared with the fixed speed compressor, energy saving 22%-40%

-Compared with the common inverter compressor, energy saving 5%-15%

System volume fluctuations larger, the energy-saving effect more obvious.

Rotor key process

The rotor processing flow is basically the same, and there are slight differences due to the different production equipment and processing capabilities of each manufacturer. The most critical part of rotor machining is milling spiral grooves and grinding spiral grooves. The combination of the two is a method commonly used at home and abroad in recent years, which is conducive to improving processing efficiency. Spiral groove milling is milling with a shaped disc milling cutter. In addition to the requirements for the transmission accuracy and rigidity of the machine tool itself, suitable rotor milling cutters become a key factor for the production of large quantities of rotors. The design of the rotor milling cutter must not only meet the basic principles of tool design, but also meet the processing requirements of the profile. When designing the tool profile based on the theoretical profile, the points with interference, reciprocation, over-cutting and sharp points should be corrected, and the original rotor profile coordinates should be adjusted to facilitate the implementation of the process, while meeting the performance requirements of the compressor. There are sharp points because it is easy to produce interruption and crossing of the cutting edge shape. 40 hp air compressor

The machining details of the rotor milling machine take Holroyd's 2AC as an example:

According to the two basic parameters of the rotor, the lead and the number of teeth are calculated according to the calculation relationship of the transmission ratio, and the appropriate change gear is selected;

Install the disc milling cutter according to the installation angle and direction of rotation;

Calculate the reserved amount of groove bottom according to the rotor tooth root diameter, adjust the machine tool, select the appropriate cutting feed speed and start machining the rotor.

In order to ensure that the profile and direction of rotation of the rotor are correct, a template can be made according to the tooth profile, and the machine tool can be stopped after milling the first slot of the first rotor for comparison, so as to avoid batch quality accidents. This method is only suitable for roughly checking whether the rotor profile is correct, but it cannot verify whether the milling cutter is designed correctly. In order to ensure that the milling cutter is correct, it can be tested on a three-coordinate measuring instrument or a rotor measuring instrument. The former is to scan the contour of the spiral groove of the rotor, and the latter is to detect the real point of the spiral groove of the rotor according to the input profile coordinates. When inspecting the rotor of the milled profile, the inspection profile input to the tester must be offset to the profile at equal distances according to the reserved amount, otherwise the profile will be wrong at the pitch circle, and the test result will not be correct. correct. 40 hp air compressor

After the rotor with the milled groove is verified and qualified, the outer circle and end face are ground according to the processing requirements of the drawing, mainly the bearing position, the outer circle of the profile, etc. The processing of the bearing position is very important. This is the basis for the assembly of the screw compressor head and directly affects the performance of the compressor.

After these processes are completed, it enters the high-precision machining process of the rotor-groove grinding. The emergence of the rotor grinder is a milestone in the improvement of rotor processing technology. Take Ho loyd's TG350E rotor grinder as an example, briefly enumerate the advantages of grinding rotors:

The grinding precision is high, the surface roughness can reach Ra=0.4um, and the meshing gap meets the designer's theoretical requirements. The smaller the clearance, the higher the efficiency of the screw compressor and the lower the noise. Generally, air compressors are larger than refrigeration compressors, and oil-injected screw compressors generally have a zero clearance point.

It can be deep-grinded, and the cost of rotor disc milling cutter can be saved for small or small batch rotor processing.

It can automatically dress the grinding wheel and balance the grinding wheel.

There are other advantages to machining rotors by grinding, but they are not listed here due to the differences in the performance of each machine tool. The basic process of rotor grinder grinding rotor is:

Use HPMS software for data processing, including calculation of forming grinding wheels, adding gaps, making inspection data files, and finally generating data files approved by the machine tool;

Input data to the rotor grinder, create a new product data folder, set the parameters related to the rotor, and save;

Install the grinding wheel, dress the grinding wheel according to the grinding wheel profile in the machine tool, and balance the grinding wheel. 40 hp air compressor

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