Small vacuum pump, small pump selection common sense

In recent years, with all walks of life on the miniaturization of the vacuum pump, does not pollute the working medium and other characteristics of the further requirements of small size, oil-free maintenance, low noise, DC power supply of small vacuum pumps, small pumps have been more widely Use. However, due to the small vacuum pump, a small variety of small pumps, such as can be divided into: small vacuum pump, small air pump, miniature sample pump, miniature suction pump, miniature pump dual pump, miniature circulation pump, etc .; lead customers always confused, How to choose the most suitable for their own conditions, the new products for the honest it? 【Small vacuum pump, the overall principle of small air pump selection】: Brushless brushless motor can be used as little as possible vacuum pump, brushless vacuum pump parameters reach, and then brush products. Can be selected from the classification of small vacuum pump, use two categories to choose: A small vacuum pump, small pump classification According to the small vacuum pump is integrated "brush motor" or "brushless motor" to classify. Brush small vacuum pump Features Advantages: The brush motor with a large torque power supply, so the negative pressure, flow can be done relatively high, the new science and technology brush products quality, performance, reliability are better , And the overall cost is lower than the high-end brushless vacuum pump. Disadvantages: Brush small vacuum pump life than the high-end imported brushless shorter life expectancy. 【Features】 brushless mini vacuum pump advantages: longer life, especially the use of high-grade imported brushless motor (as new technology is), life expectancy is often close to tens of thousands of hours (full load); especially suitable for day and night continuous operation , Such as long-term online sampling pump used ... but also "speed" function, that is, the use of "duty cycle" to adjust the motor speed (PWM speed), even to achieve constant pressure, constant current, constant speed Advanced application. Disadvantages: negative pressure and other parameters to be smaller than the brush; the cost is higher than the brush. Therefore, the parameters can be achieved, should try to choose a small brushless vacuum pump, brushless product parameters are not enough, then consider the brush products. Second, the small vacuum pump, the use of small pumps According to the purpose of micro-pump selection. We discuss one by one in three categories. A), if only using a small air pump output compressed air. Simply put, it is only to use it to cheer, inflatable, pump pumping port basically do not, common applications: sub-surface gas explosion, gas and so on to airtight container; this situation is relatively simple, optional models are as follows (brushless , Brush, positive pressure descending order): Miniature brushless vacuum pump: FAY series, FML series; Small vacuum pump (brush): PCF series, FAC series, FAA series, FM series. Which focus on micro-brushless vacuum pump recommended FAY series, miniature brushless vacuum pump FML series, miniature brushless vacuum pump PCF series, miniature brushless vacuum pump FAC series. Of course, we also refer to flow indicators and other related technical parameters. B) If the pump is micro-pump, the situation is a bit more complicated. Judge the condition of the pump suction side The small pumps used for pumping are divided into two types: gas sampling pump and small vacuum pump. In short, the difference between the two is as follows: The gas sampling pump can only be used with a small load (ie, the pump suction resistance must not be too high), but the price is cheap; in the strict sense, the small vacuum pump can carry a large load Big resistance, or even completely blocked), but the price is slightly expensive. Miniature gas sampling pumps are: PM series, SA series, SB series; small vacuum pump is divided into two categories: single suction, suction pumping two purposes; small vacuum pump (single suction) categories include: press brushless, Negative pressure from high to low, the flow of descending order Micro-brushless vacuum pump: VLK, VLC, VML series of small vacuum pump (brush): VCH, VBH, VCA, PC, PK, VAA, VMC, VM series. Among them, VLK, VLC, VML, VCH, VBH, PC, PK, VAA and VMC are the key points of the research.Exhaustion and pumping dual-use categories include: For the resistance of the mini pump suction end, it can usually be determined empirically by a simple and convenient method, The following conditions are large loads (ie pump pumping resistance at the suction side), only in the "small vacuum pump" range selection: ① pump suction side to take a long pipe, or pipe Bending point and more, bending or blocking even closed, or the pipe hole is very small (for example, less than φ2 mm); ② in the pipeline throttle, solenoid valve, gas circuit switches, filters and other components; Airtight container connection, or less closed container but a smaller amount of air intake; ④ pump suction port connected with the suction cup, used to adsorb objects (manifolds, etc.); ⑤ pumping end of the pump connected to the filter container for accelerated liquid filtration. (C) to determine the micro-pump exhaust end conditions In addition to taking into account the suction end of the situation, but also must consider the exhaust end resistance, so as to finally determine the optional range. In practical applications, small vacuum pump facing the exhaust condition is not the same: one is very smooth exhaust, through the atmosphere; the other is a larger exhaust resistance, such as in the exhaust pipe valve, elbow, Sensors, sub-surface exhaust, gas discharged to airtight or semi-airtight containers, etc., need to be treated differently. In a nutshell, for systems with large exhaust resistance, our selection range is: FAY, FML, PCF, FAC series. For systems with low exhaust resistance, the selection range is: VMC, VML, VLC, VLK, PK, PC, VCA, VCC, VCH, VBH series According to the above steps, we have been able to determine the range of micro-pump selection . According to the flow and vacuum requirements can determine the specific model. Note that the parameters to choose to leave a margin, especially the flow parameters. There are also some issues related to the selection listed below, based on usage considerations. 1, with the load start problem. 2, micro-pump medium temperature problems. Depending on the temperature of the medium gas passing through the pump, select the type to be normal (temperature range 0-50 ° C) or high temperature (temperature range 0-100 ° C). 3, the reliability of micro-pump. 4, micro-pump electromagnetic interference problems. The best option is to choose a small brushless vacuum pump; because it basically did not interfere.