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Research on the application of frequency conversion technology in single screw air compressor

time:2017-09-25 15:26:32source:Ziqi compressorauthor: 赵疆昆Clicks: 0
Single screw refrigeration compressor has many advantages, such as simple structure, good load balance, long life of bearings, small vibration and low noise.

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  Single screw refrigeration compressor has many advantages, such as simple structure, good load balance, long life of bearings, small vibration and low noise. It has been widely applied in refrigeration and air conditioning. Due to the change of application and external climate conditions, the design of single screw refrigeration compressor requires a certain amount of cooling capacity adjustment function to meet the needs of different load conditions, so as to achieve the effect of energy saving and consumption reduction.
In the completed work, scholars at home and abroad have carried out a series of researches on the energy regulation mechanism and their working principles, and put forward many different technologies to regulate the cooling capacity of the single screw refrigeration compressor. Japan's Mitsui Seiki manufacturing machine in the early use of diaphragm gas regulator can adjust cooling capacity, the mechanism can be independently installed on the intake pipe, has no effect on the main structure, but the structure is complex, the use of a small screw compressor often changes in levels in the. Subsequently, Jin Guangxi (1983 pairs of single screw refrigeration compressor used in the rotary ring gas volume regulation mechanism's basic structure and working principle were studied, and put forward the rotation ring design process of each structure parameter determination method. B.Zimmern (19832000 puts forward a method to adjust the air volume of a single screw compressor by a slide valve, and improves the regulating mechanism of the slide valve. After that, Japan's Daikin Co., Ltd. (28) proposed a revamping scheme for spool valves, that is, to open a boss in the slot section of the spool valve, and use the pressure generated by the refrigerant gas on the boss to restrain the rotation of the valve body, so as to ensure the clearance between the spool valve and the screw rotor. In terms of theoretical research of gas volume adjustment method, Zhou Lei, Lin Qiang and Jin Guangxi et al. (1998) studied the influence of rotary ring regulator and slide valve regulator on compressor volume volume ratio, indicating power and specific power. In order to control the compressor volume ratio changes, in order to reduce or avoid additional energy loss, and Guangxi (1999 Jin Zhou Lei proposed a split spool valve structure, but because of the adjustment mechanism is complex, not its application. In 2007, the US VILTER formula proposed a double slide valve air conditioning unit and applied for a patent.
Although the double spool adjustment mechanism can be eliminated due to excessive energy loss caused by compression, but need to use gear and rack transmission mechanism respectively control spool displacement, poor stability, so the current in the single screw compressor used for single spool gas regulating mechanism is still.
It can be seen that at present, the single screw refrigeration compressor mostly uses the following ways of gas volume regulation: membrane type, rotary ring type and slide valve type, and the use of frequency conversion technology in single screw refrigeration compressor has not been studied publicly.
The structure and work according to the characteristics of single screw compressor, to study the possible application of frequency conversion technology in single screw compressor in the problem, analyzes the influence of high pressure compression chamber for various parts of the strength of the compressor startup process, and compared the use of frequency conversion technology, the energy consumption of the compressor in refrigeration and heating 2 under the conditions of. Through the analysis, the technical difficulties of the application of frequency conversion technology in single screw refrigeration compressor are pointed out, and the basis for the future development of new technology is provided.
2, with the development of economy, the technology of frequency conversion technology is more and more needed for human's production and life. Therefore, the application of frequency conversion technology as green energy saving in air conditioning and refrigeration industry is also rising. Variable frequency speed regulation is to adjust the speed by changing the frequency or voltage of the motor stator winding. At present, the frequency conversion technology used in the refrigeration unit includes DC frequency conversion and AC frequency conversion.
AC frequency conversion technology is a technique to change the speed of the compressor by changing the frequency of the power supply by the frequency converter. When the stator winding turns on the three-phase AC motor speed, available http://www.cnki.net swin SW will be quasi public swmid swmid SW will be quasi quasi quasi s problem: (3) single screw compressor in the shutdown, the pressure balance within the whole system, the pressure of irrigating pressure, the pressure is much higher than the inlet pressure in the process of design of compressor. If the load is not started directly, the pressure inside the compression chamber will be much higher than the normal working condition, which will bring great test to the strength of the main parts of the compressor.
2 single screw refrigeration compressor is fixed after the design is completed. When using frequency conversion technology to adjust the air volume of the compressor to adapt to the load change, the pressure ratio will also change. However, as the position of the exhaust port is fixed, the content ratio is not adjustable, resulting in the unequal internal and external pressure ratio, which will bring additional energy loss.
3, during the start-up process, the high internal pressure will not only affect the structural strength of the internal components, but also increase the starting torque of the compressor and increase the starting load of the motor.
The change of the 4 speed has a great influence on the running characteristics of the bearing.
4, based on the calculation results and analysis, the influence of frequency conversion technology on the working process of single screw refrigeration compressor is analyzed from the first 2 problems in the last section for a single screw refrigeration compressor. The parameters of this type of compressor are shown in Table 1, the main parameters of the refrigerants used for the R134a. Table 1 single screw refrigeration compressor screw diameter diameter wheel center distance of the star wheel width of 4.1 to start the process of high pressure compression chamber due to the cooling capacity requirements, cold water machine assembling machine is completed, when the compressor is shut down, the refrigerant in the system

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