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First, the feasibility of air compressor energy saving transformation Air compressor in the course of the energy consumption is obvious to all, Beijing Zhongtian Energy Company based on the principle of frequency developed Zhongtian high-pressure fan Saver for all motor-driven air compressor energy-saving transformation. The overall energy-saving effect is significant, saving rate of 20 to 50%. The actual transformation of Beijing Zhongtian Energy Saving Co., Ltd. as a limited company is illustrated as follows: Electric Company currently has 4 fully automatic production lines, another 80 injection molding machine to Taiwan, the required compressed air provided by a group of compressors. The factory gas supply system has a total of four 380V compressor, of which two 37KW always work, and the other 55KW and 45KW according to the situation in the gas supply in different time periods put into use. Due to the lack of design compressor and the uncertainties in the production process, the air compression system has the following defects: Waste of energy. Compressed air production line pressure requirements for the 3kgf / cm2, the gas manifold to maintain the pressure at 3.2kgf / cm2 more appropriate. As the air can not be constant, in fact, two 37KW air compressors can basically meet the requirements of operation, three air compressors operate, there are more frequent deflation phenomenon, more serious waste of energy. Moreover, the system pressure often fluctuates in a wide range from 3kgf / cm2 to 4kgf / cm2, to a certain extent, affecting the quality of the products in some processes. loud noise. Air compressor automatically deflated when the noise is very loud, resulting in environmental pollution. Power grid impact. As the three air compressors are frequency start, run, the machine's starting current up to 630A above, causing impact on the power grid. Gas volume fluctuations. As the system can not automatically adjust the air supply, air supply fluctuations in the quality of the product has a certain impact. In summary, the air compressor energy saving system can be used to transform the existing air compression system, the use of PID control frequency conversion technology to establish a constant pressure air supply system, so as to achieve energy saving, reduce noise, reduce equipment wear and tear, reduce the grid Impact, improve power factor, stable product quality and other effects. Air compression system energy-saving transformation principle 1, power saving principle introduction Energy-saving controller using frequency conversion technology and the latest PID control technology, the use of pressure sensor signals and related electrical control signals, according to set the compressed gas pressure control air compressor motor speed, the pressure maintained at the required pressure value, the usual Do not have to save the energy saved, so as to achieve the purpose of saving electricity. The system uses continuous program control, there is no frequent impact of large current impact, which can effectively protect the power grid. 2, transformation requirements The factory gas supply system has a total of four compressors, of which two 37KW always work, and the other 55KW and 45KW according to the gas supply in different time periods put into use. The factory requires that the air compressor be supplied with a constant pressure gas supply, the pressure range of the gas supply is 0 ~ 1MPa; in addition to the full frequency (power frequency) work of two 37KW air compressors, the other 55KW and 45KW can be switched into work, The operating frequency is controlled according to the required air pressure. 3, control methods The working principle of the control system is shown in the following figure. It can be seen from the figure that there are 1 55KW air compressor (1 # pump), 1 45KW compressor (2 # pump) and 2 37KW compressors (3 # and 4 # pumps) for system operation. Two 37KW frequency operation, can not speed, the other two by the inverter speed. According to the specific circumstances of the plant air compressor, motor drive equipment inverter selection 55KW inverter, 55KW and 45KW can adapt to the use of two air compressors. In order to realize constant pressure gas supply on the gas pipeline, a pressure transmitter is installed on the gas transmission pipe, and the pressure in the pipe network is transformed into a 4-20mA signal and sent to the intelligent self-tuning PID regulator. PID regulator 4 ~ 20mA input signal into a 0 ~ 10VDC electrical signal, control the inverter output frequency and output voltage, thereby changing the motor speed. System work, 3 #, 4 # pump running frequency, such as pipe network pressure is not enough, the inverter control 2 # pump to work, if work to the working frequency state pipe network pressure is still not enough, the inverter automatically switches to 1 # pump , The inverter will automatically switch to # 2 pump. If it is still too high, pump # 2 will stop working and only # 3 pump will stop working. When pump pressure is too high, , 4 # frequency operation can be. So that the main air pressure is basically constant, to achieve the purpose of constant pressure gas supply. When the compressed air consumption changes greatly, the system pressure reaches the set maximum or minimum value, installed in the gas main power contact pressure gauge will detect the signal sent to the logic switching controller, as the system into / One of the important conditions (but not the only) to cut out the MF unit. When the system needs to be put into the power frequency unit, the system first judges which unit is in a ready state (STANBY), and then sends out an alarm signal, and then executes the start command after the delay; when the pressure is too large, it must be stopped without human interference , The system directly issued a stop command, the unit downtime. Comprehensive benefit analysis Zhongtian high-pressure fan energy-saving controller to minimize the air compressor power consumption, due to the realization of the stepless speed regulation, air compressor power consumption and the use of pneumatic equipment is closely related. After the air compressor energy-saving controller is installed to save energy, we expect the overall energy saving effect will generally reach 20% ~ 50%, and some air compressors may reach a higher level. After the company's air compressor unit has been transformed, the following results have been achieved: Save electricity: After the constant pressure gas supply system is put into operation, the gas pressure in the gas tank can be kept within 2.5% of the set value, the energy lost automatically will be saved and saved. After measured, the electricity saving rate will reach 40% , While the power factor increased to COSф> 0.95, reducing reactive loss; Reduce noise and reduce environmental pollution: constant pressure air supply system due to the realization of the frequency control, basically eliminating the situation of emptying deflated, thus improving the noise pollution of the environment; Extend the life of mechanical components: the use of air compressor power-saving system, the air compressor most of the time running under the power frequency, can significantly reduce the wear and tear of mechanical components, extend the life of the machine, reduce maintenance costs and reduce maintenance time; Realize the soft start: Reduce the unit starting current impact on the grid, and can be flexibly repeated many times to start, to avoid self-coupling buck start in this area; Constant pressure air supply: After the system is put into operation, it improves the air supply reliability and load capacity adjustment ability, ensures constant air supply pressure and further ensures the stability of product quality. Reliable operation, the failure rate is almost zero: the system is equipped with overload, loss of pressure, voltage, over current, lack of equal protection, reliable operation; Simple operation, failure does not affect the production: Energy-saving device fails, it can automatically shut down and send a fault signal, at the same time, can be converted to electricity to make the normal operation of air compressor, does not affect the production.

In the 21st century, the air compressor market is fiercely competitive. Consumers often choose machine quality and price as part of their purchasing standards. Therefore, a variety of marking methods commonly used in the market as a description, to contribute to the protection of consumer sports. One. Four basic logo methods: 1. Use motor horsepower to indicate: This is not feasible in the early days of air compressor technology, but with the continuous development of technology, even though the same motor is used now, but also because of the pressure level, air compressor manufacturers and models of different sizes, Air compressor row of the amount of wind there is a world of difference. Therefore, it is the most irresponsible practice to list only the motor horsepower in the catalog. 2. Use piston displacement (Piston displacement) to indicate: Because this is the air compressor design information, only the cylinder size multiplied by the number of revolutions, so this information is the easiest to get, but also for many manufacturers used to mark. There is no certain relationship between this theoretical value and the actual air volume, depending on the manufacturer's technical capabilities. 3. Use the Inlet volume to indicate: This representation is usually measured on the inlet side by an Orifice meter and is currently used only to indicate the size of the centrifugal compressor. The unit used by the ICFM, although more accurate than the previous two methods, but not included in the internal loss, it is still higher than the actual amount of gas. 4. Use Free air delivery to indicate: This method is the use of aperture meter measured at the exit side, as accurate and thus become the world's main standard used to determine the actual air compressor output, such as ISO, ASME, JIS, etc. However, in some Japanese manufacturers directory, Use FAD to mark, but add Nominal capacity, it is generally understandable that: This FAD is not true, but only a design value. It is a pity that standards are one thing and whether or not they are done is not the same thing. Therefore, the credibility of the original catalog will be greatly reduced unless it is based on the standard written on black and white on the original catalog. Second, under different conditions showed the actual amount of air: The actual air output refers to the air volume measured at the exit of the air compressor (after the aftercooler) taking all the losses into consideration, and is usually expressed as Free Air Delivery. The so-called free air volume refers to the volume of air compressed by the compressor to the air inlet free air conditions (temperature, pressure, humidity, etc.) to represent. Therefore, even if the same test standards are used, the numbers shown will differ by more than 20% from the "free air" taken. The following are some common free-air conditions. 1. Normal Condition (Normal Condition): Said method: Nm3 / min (or indicate the test used in the gas situation) Indicated air condition: 760 mmHg, 0 0C, 0% RH Volume index: 1.00 2. Standard Condition (Standard Condition): Said: SCFM (or indicate the test used in the gas situation) Air condition indicated: 1 bar, 20 0C, 0% RH Volume index: 1.05 (about) 3. Actual Condition (Actual Condition): Representation: ACFM, ICFM (or indicate the gas condition used in the test) Indicated air conditions: 14.4 psi, 35 0C, 60% RH Volume index: 1.20 (about) The same amount of gas, as long as the use of different air conditions, can increase the figure 20%. Third, under different pressures tested out the actual amount of air: The actual value of the air volume (FAD) is related to the reference air condition and also to the test under what pressure. For example, a 55 kW Lurtz blower measured an actual air output of about 40 m3 / min at 0.5 barg and a 55 kW micro-oil screw compressor measured an actual air output at 8 barg of about 9.1 m3 / min, whereas the actual air output measured at 13 barg is about 6.8 m3 / min. Thus comparing the actual power with different brands of different brands of air compressor output, to consider the pressure of the test flow. There is no strict theoretical calculation formula to convert, but there is a recognized empirical formula can be used as a reference. For the injection screw air compressor, if the pressure is still rising to maintain the same actual air output, you need to increase the rotor speed, while consuming 6 ~ 7% of the motor power. For a completely oil-free screw air compressor, you need to increase the power consumption by about 10%. For example, suppose the actual air output of a 55 kW micro-oil screw machine A measured at 7 barg is 9.54 m3 / min and that of another 55 kW micro-oil screw machine B measured at 8 bar is 9.1 m3 / min, whether A high efficiency or B high efficiency? According to the empirical formula above, if the output of A remains at 9.54 m3 / min at 8 barg, the power consumption of more than 6% needs to be increased, that is, the specific energy of 55 kW × 1.06 = 58.3 kW is respectively: A: 58.3kW ÷ 9.54m3 / min = 6.11kW / (m3 / min) B: 55 kW / 9.1 m3 / min = 6.04 kW / (m3 / min) (6.11-6.04) ÷ 6.04 × 100% = 1.16% This means that B air compressor efficiency of 1.16% high. Four air compressor motor power Air compressor efficiency and the actual air compressor output and the power consumed by the motor. The actual amount of air due to different test methods and that there are significant differences in value. The same is true when examining the motor power of an air compressor. At the same time, the efficiency of the air compressor is also related to the service factor of the motor, the efficiency of the motor and the like. 1. Specific pressure shaft horsepower People often use specific energy (Specific Energy) - the unit output of the power consumption to measure the efficiency of air compressor, where the power consumption is said that the specific pressure shaft horsepower, meaning the air compressor outlet pressure reaches a certain pressure point, air pressure Spindle power consumption. Due to different manufacturers selected pressure points are not the same, which marked the shaft horsepower is not the same. Service factor Compressor motor power refers to the nominal power of the motor or rated power, but this does not mean that the actual power consumed by the motor. For domestic manufacturers in Europe and China, the actual motor power consumption is generally less than the nominal power rating, while the US manufacturers are accustomed to using a smaller motor, its service factor is larger, such as 1.25, and at full load , The motor output can exceed the nameplate 15%, such as the motor identified as 100HP, the actual output may exceed 115HP. This made the old rule that "the actual power consumption of the motor must be less than the rated power on the motor's nameplate." Therefore, in general, for the same horsepower air compressor, the European brand of air volume data than the US brand of air volume data for the above reasons. Now some European brand manufacturers have begun the United States. V. Compressor efficiency As mentioned above, consider the efficiency of air compressor to consider the test method, said the state, the test pressure points, the actual power consumption, etc., but also consider the motor efficiency, because the shaft horsepower is only the output part of the motor, the user pays electricity according to the input power Calculated, the efficiency of air compressor can not but consider the efficiency of the motor. In this way, it would be almost pointless to compare the efficiency of each manufacturer with the information on his catalog, without understanding the standards each manufacturer uses to identify its compressors and motors. In fact, even knowing all the details of the manufacturing plants is very difficult to compare, because the relationship between different standards is difficult to determine. Therefore, comparisons based on the information provided on the catalog can only be "referenced."

The general filter element is composed of fiber media, filter, sponge and other materials, compressed air in the solid, liquid particles (droplets) after intercepting the filter material, condensed in the filter surface (inside and outside). The droplets and magazines that accumulate on the surface of the filter element settle to the bottom of the filter by gravity and are discharged by the automatic drain or manually.