With the vigorous development of instrumentation industry, compact, oil-free miniature vacuum pump, micro-pump is more and more widely used. How can we choose the most appropriate product in a variety of micro-pump?
First of all to clear the purpose of micro-pump. We discuss one by one in three categories.
First, if only the output of compressed air micro-pump.
Simply put, it is to use it to cheer, inflatable, pump exhaust port basically do not have. This situation is relatively simple, according to the output pressure in descending order: PCF5015N, FAA8006, FAA6003, FAA4002, FM2002, FM1001. Of course, we also refer to flow indicators and other related technical parameters.
Second, if it is the following situations, you should choose PHW600B or WAA series products.
1, with a mini pump or vacuum pump, but sometimes there will be liquid water into the pump chamber.
2, require micro-pump both pumping and pumping.
3, the main pump with a miniature pump, but do not want to manually add water before pumping. (Some pumps require manual diversion prior to work so that the pump can pump the water down, otherwise the pump can not pump or even damage.) The strength of the PHW600B or WAA series is that when it comes in contact with water, it pumps Vacuum, the formation of a vacuum by air pressure up, and then began pumping.
4, using a miniature pump, but sometimes there may be no pumping pump, in dry state. Some traditional pumps fear dry, even fatal. The PHW600B or WAA series is essentially a compound function pump that integrates the functions of a vacuum pump and a pump, some call it a vacuum pump. So, in the absence of water, it will be evacuated, and when it has water it will pump it. Whether pumping or pumping state, belong to the normal work category, it does not matter dry damage.
Third, if it is micro-pump pumping, the situation a bit more complicated.
(A) to determine the micro-pump pumping end conditions for pumping the micro-pump is divided into two categories: gas sampling pump and miniature vacuum pump. Although they are often referred to as miniature vacuum pumps simply and indiscriminately, they differ from the technical point of view and require special attention.
In short, 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 very low; in the strict sense of the micro-vacuum pump can carry a large load Blocked), but the price is slightly expensive. The specific difference between the two can be found in the article "on the difference between miniature vacuum pump and gas sampling pump", will not repeat.
The gas sampling pumps are: PM series, SA series, SB series; miniature vacuum pumps are: VM series, VAA series, PK series, PC series, VCA series, VCC series, VCH series, PH series, FM series, FAA series, PCF series , All the specifications under these series are real miniature vacuum pumps, such as VM7002, VAA6005, PC3025 and so on.
Pump for the micro-pump size of the resistance can be measured by the instrument, it and the technical parameters of the pump inlet allowable maximum resistance Por value can know the selection is appropriate. Usually based on experience and easy to use methods to determine, such as the following several cases belong to a larger load (ie pump suction end of the resistance), can only be selected within the miniature vacuum pump range:
① Pump pumping end to take a long pipeline, or pipe bending point, 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 switch, filters and other components;
③ pump suction port and airtight container connection, or the container is not closed but intake is small;
④ pump suction port and sucker connection, used to adsorb objects (such as manifolds, precision workpieces, etc.);
⑤ pumping end of the pump connected to the filter container, container placed filter screen, used to speed up liquid filtration.
(B) to determine the micro-pump exhaust end of the above conditions are discussed micro-pump suction end resistance problems, according to these conditions have narrowed the selection criteria, but also must consider the exhaust end of the resistance problem, in order to Finally determine the optional range.
In practice, the miniature vacuum pump is 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, a small bend , Large damping sensor, non-specific muffler, exhaust below the liquid level, the gas discharged to airtight or semi-airtight containers. In the modern design and manufacturing, to face the different exhaust conditions of miniature vacuum pump treated differently. Exhaust port to allow maximum resistance Por value This parameter is the calibration of the pump exhaust capacity, so that we can use strict technical means to determine the selection is appropriate.
In short, for the system with large exhaust resistance, our selection range is: FM series, FAA series, PCF series; For the system with small exhaust resistance, the selection range is: VM series, VAA series, PK series, PC series, VCA series, VCC series, VCH series, PH series. Based on the above steps, we have been able to determine the selection of micro-pump range. In the delineation of a few optional series, and then based on our flow and vacuum requirements can determine the specific model. For poor quality products are not included in this article, try not to use. Note that the parameters to choose to leave a margin, especially the flow parameters. Pump access to the gas system, due to the pipeline, valves and other airway components to cause pressure loss, will reduce the flow, the resulting flow is less than the nominal pump flow There are some and selection-related issues are listed below, according to the use of consider.
1, with the load start problem.
If the miniature air pump already had a vacuum on its suction port before the start-up, or the pressure in the exhaust port already exists, consider another pump's technical specifications: the maximum start-up load Pis value for the intake port and the maximum start-up load Pos value for the exhaust port. A typical application example is the use of micro-air pump to maintain the container under vacuum or positive pressure, when the vacuum or positive pressure within the container is lower than the set value, the need for pump power start, above the set value shutdown. The products that can be activated under the ultimate vacuum degree that they can reach are: VM series, VAA series, PK series, PC series, VCA series, VCC series, VCH series, PH series; can start under the maximum output pressure that can reach by itself The products are: FM series, FAA series, PCF series. The performance of the manufacturer's technical requirements.
2, micro-pump medium temperature problems.
Depending on the temperature of the medium gas passing through the pump, the choice is either ordinary or high temperature.
3, the reliability of micro-pump.
Depending on the severity of the consequences of the mini pump failure, it is entirely based on your own requirements. The average quality of trouble-free continuous operation of more than 1,000 hours, some up to thousands of hours. Special attention to this parameter is measured at full load, continuous operation, is the worst operating conditions, if the actual use is not full or continuous operation, the value will be higher, depending on the number of high pump conditions set. The performance is a test of the manufacturer's technical strength entirely, from the product appearance can be seen some, such as the use of special motors instead of ordinary low-cost motor, the case of considerable weight and other heavy. According to product prices can also know a little bit.
4, micro-pump electromagnetic interference problems.
If you have a precision circuit-controlled micropump that depends on the circuit's immunity to interference, you may want to order a miniature pump with low electromagnetic interference.
