Advantages of AC and DC static elimination device
The static elimination device can be divided into AC and DC according to the high voltage type used by its discharge electrode (discharge needle). The AC is divided into high frequency and ordinary AC (commercial frequency), and the DC is divided into continuous DC. , DC pulse type.
The difference between the AC and DC static elimination devices is that a discharge needle of the AC type static remover can alternately generate positive and negative air ions. The discharge electrode is composed of the discharge needle and the ground electrode. The discharge electrode of the DC type static remover does not A grounding electrode is required, and the discharge electrode is composed of separate discharge needles for positive and negative. When there is no external air supply (such as a fan, compressed gas, etc.), the DC static elimination distance is farther than the AC type. In the case where there is external air supply, the static elimination distance mainly depends on the static elimination distance. The structure, the air volume and the strength of the high-voltage power supply.
The difference between AC and DC static elimination devices is the difference in ion balance. The AC type static elimination device generates both positive and negative ions on the same discharge needle, so even if the discharge needle is worn for a long time, the ion balance There will be no major changes, and the ion balance performance is better. Because the discharge needle is composed of independent positive and negative electrodes, the ion balance is poor when used at close range. In addition, the discharge needle is affected by the environment and the degree of contamination of the needle during use will affect the ion balance, especially the discharge After the needle is used for a long time, the degree of wear of the positive and negative discharge needles is different, and the ion balance cannot be corrected even after cleaning.
Since the discharge needle will be contaminated after long-term use, it will directly affect the static elimination performance and ion balance. Therefore, the static elimination electrode part should be cleaned regularly during use, especially the DC type static elimination discharge needle is more susceptible to pollution. Electrical appliances should be cleaned more frequently, and the positive and negative discharge needles have different degrees of wear. Regular ion balance testing is required. When the discharge needles are severely worn, the discharge needles should be replaced in time.
【What is the difference between AC high frequency (68KHz) and ordinary AC (commercial frequency) static elimination devices? 】
Ordinary commercial frequency (50Hz/60Hz) AC neutralizers use coiled iron core transformers, which have been widely used because of their simple structure and convenient manufacturing. Due to the large volume and heavy weight of the coiled core transformer, there are many inconveniences and limitations in the use of the separator. Therefore, in recent years, many related companies in the world have been actively developing small and lightweight separators. High-frequency (68KHz) static elimination appliances are attracting widespread attention and favored by users because of their small size and light weight. The high-frequency (68KHz) static eliminator must take into account issues such as the boost mode of the high-voltage power supply, the symmetry of the output waveform, and the matching with the electrode load, so it is very difficult to manufacture.
Ordinary commercial frequency (50Hz/60Hz) AC neutralizers use coiled iron core transformers, which have been widely used because of their simple structure and convenient manufacturing. Due to the large volume and heavy weight of the coiled core transformer, there are many inconveniences and limitations in the use of the separator. Therefore, in recent years, many related companies in the world have been actively developing small and lightweight separators. High-frequency (68KHz) static elimination appliances are attracting widespread attention and favored by users because of their small size and light weight. The high-frequency (68KHz) static eliminator must take into account issues such as the boost mode of the high-voltage power supply, the symmetry of the output waveform, and the matching with the electrode load, so it is very difficult to manufacture.
The high-frequency (68KHz) eliminator is not only small in size, light in weight, and convenient to use, but also the generated ions are in a high-density mixed ion pair state (see Figure 1), and the stability and durability are better than ordinary commercial frequencies (50Hz/60Hz) ) AC type neutralizer is more suitable for remote neutralization, static elimination of high-speed moving objects, and large unevenness of the unevenness of objects with small local space. Experiments have proved that the ions generated by the DC type separator and the ordinary commercial frequency (50Hz/60Hz) AC type separator cannot be transmitted through the pipeline, while the high-frequency (68KHz) type separator can do it.
The high frequency (68KHz) separator has a better ion balance than the ordinary commercial frequency (50Hz/60Hz) AC separator. We usually use a charged flat tester when testing the ion balance of the separator, and the result is DC For the component bias voltage, if you compare two kinds of eliminators with the same ion balance result, the voltage fluctuation range of the high-frequency (68KHz) eliminator ion formation is smaller from the microscopic AC component, which is more suitable for ion balance requirements High-product static elimination. The following figure shows the waveform curve measured after the charged flat panel tester is connected to the oscilloscope. Figure 2 shows the test results of a common commercial frequency (50HZ/60Hz) AC type neutralizer, and Figure 3 shows the test results of a high-frequency (68KHz) type neutralizer. .
The high-voltage output of ordinary commercial frequency (50Hz/60Hz) AC eliminators generally needs to be above 4000V, while the high-voltage output of high-frequency (68KHz) eliminators generally only needs to be above 2000V, which is safer and saves energy. The electromagnetic interference is small.
The disadvantage of the high-frequency (68KHz) electric eliminator is that the concentration of ozone produced is relatively high. If the air supply of the eliminator is very weak, we will feel the peculiar smell of ozone. Discharge needles are also more susceptible to contamination than ordinary commercial frequency AC type eliminators, so more attention should be paid to the cleaning of the electrode.
[What material is used for the discharge needle of the eliminator to make the performance better? 】
The discharge needle is made of metal materials, generally stainless steel (SUS), metallic germanium (Ge), nickel (Ni), titanium (Ti), metallic tungsten (W) and other corrosion-resistant materials. Stainless steel is widely used due to its low price. , Metal tungsten is more wear-resistant and corrosion-resistant than stainless steel and is also widely used. On the basis of long-term development and research, Shanghai Yastar Technology Development Co., Ltd. currently uses a new type of alloy material for the discharge needle, which is more wear-resistant and corrosion-resistant than metal tungsten, ensuring that the discharge needle has the same static elimination performance after long-term use. , The ion balance is stable.
The shape of the tip shape of the discharge needle made of new alloy material and the discharge needle made of metal tungsten material after high current test.