Micro vacuum pumps and micro air pumps are often called "laboratory vacuum pumps", because they are often used in scientific research and laboratories for gas circulation, gas sampling, suction filtration, vacuum pumping, indirect water pumping, etc., and are sometimes collectively referred to as laboratory vacuum pumps.
Laboratory vacuum pumps, that is, miniature vacuum pumps, are generally powered by DC motors. Because the DC motor can be small in size, light in weight, and easy to carry, and the DC power is also a safe voltage.
When the laboratory vacuum pump is used for gas circulation, it is to make the gas in the two containers flow evenly, which requires the pump's suction port to bear a certain resistance. In front of the suction port of the pump, airtight containers are generally arranged. In addition, many air circuit components, such as valves, flow meters, airtight containers, etc., must be connected to the exhaust end of the pump, resulting in a large exhaust resistance, and often There is a case where the exhaust port is completely blocked.
The PCF series of miniature vacuum pumps commonly used in laboratories can provide a negative pressure of -50Kpa at the suction port, and a positive pressure of 100Kpa higher than the atmospheric pressure at the exhaust port. The suction port and exhaust port of this miniature vacuum pump can be blocked arbitrarily (hanging a large load), and even the pumping and gas ports are completely blocked, which is also a normal operation. Therefore, it is very suitable for dual-purpose pumps for gas circulation, sampling, and pumping and pumping.
The advantage of a general vacuum pump is that the load is placed on the suction port, and the exhaust cannot be blocked. This is taboo in the application of the experimental process.
In the test, sometimes the pumped liquid is highly corrosive, and the liquid cannot be allowed to enter the air pump. It is also necessary to use a micro vacuum pump for indirect pumping, which is another advantage of the laboratory vacuum pump.
In the process of selecting a laboratory vacuum gauge pump, what factors need to be considered according to the application.
1. Starting problem with load.
If the laboratory vacuum gauge pump has a vacuum at its suction port or a pressure at the exhaust port before starting, another technical parameter of the pump should be considered: the maximum starting load Pis value of the air inlet, and the maximum starting load of the exhaust port Pos value. A typical application example is to use a laboratory vacuum gauge pump to maintain the vacuum or positive pressure state in the container. When the vacuum or positive pressure in the container is lower than the set value, the pump needs to be powered on and stopped when it is higher than the set value.
The products that can be started under the maximum output pressure that can be achieved by itself include: FM series, FAA series, PCF series.
This performance requires a higher technical level of the manufacturer.
2. The medium temperature of the laboratory vacuum gauge pump.
According to the temperature of the medium gas passing through the pump, choose the common type or the high temperature type.
3. The reliability of laboratory vacuum gauge pumps.
It depends on the seriousness of the consequences of the failure of the vacuum gauge pump in the laboratory, and it is completely based on your own requirements. The average trouble-free continuous running time of high-quality products is more than 1000 hours, and some are as high as thousands of hours. Special attention, this parameter is measured under the condition of full load and uninterrupted operation, which is the worst working condition. If the actual use is not full load or continuous operation, the value will be higher, and how much higher depends on the working condition of the pump. Certainly. This performance is a test of the technical strength of the manufacturer. It can be seen from the appearance of the product, such as the use of special motors instead of ordinary low-priced motors, and the weight is relatively heavy when the volume is the same. According to the price of the product, you can also know a thing or two.
4. Electromagnetic interference of laboratory vacuum gauge pumps.
If there is a precision circuit to control the micropump, depending on the anti-interference ability of the circuit, it may be necessary to order a micropump with low electromagnetic interference.
Precautions for the use of laboratory vacuum gauge pumps:
- 1. The laboratory vacuum gauge pump should be installed in a clean, flat, dry and well-ventilated place. It is advisable to keep the pump temperature at 15°C-40°C as much as possible. Otherwise, due to the increase of oil temperature, the decrease of viscosity, and the saturated vapor pressure will increase, resulting in a decrease in ultimate vacuum.
- 2. Before use, check the oil level. It is advisable to fill oil to the center of the oil mark when the pump is stopped. If it is too low, it will not be able to seal the exhaust valve.
- 3. Try to use the clean vacuum oil of the specified brand. If there is any difficulty, you can use No. 50 mechanical oil instead; after oiling, screw the screw plug. The oil should be filtered to prevent debris from entering and blocking the oil hole.
- 4. If the relative humidity is high, or the pumped gas contains a lot of condensable steam, it is advisable to open the gas ballast valve after connecting the pumped container, and close the gas ballast valve after 20-40 minutes of operation. Before stopping the pump, you can open the gas ballast valve and run without load for 30 minutes to prolong the life of the pump oil.
- 5. When the pump oil is polluted by mechanical impurities or chemical impurities, the pump oil should be replaced. The oil change steps are as follows: First, start the pump and run for about half an hour to make the oil thinner, then stop the pump! Unscrew the oil drain plug, drain the dirty oil, and then open the air inlet to run for 1-2 minutes. During this time, slowly add a small amount of clean vacuum pump oil from the air inlet to flush the pump core. After the dirty oil is put back, screw on the oil drain plug and tighten it: unscrew the oil plug, use a funnel to add clean vacuum pump oil from the oil port, and screw on the oil plug.
- 6. The laboratory vacuum gauge pump is not suitable for pumping gas that is corrosive to metal, chemically reacts to pump oil, contains particles of dust, and gas that contains too much oxygen and is explosive; it cannot be used as a compression pump or For delivery pumps.
- 7. When the laboratory vacuum gauge pump is not in use, use rubber stopper caps to plug the inlet and outlet ports. To prevent dirt from falling into the pump.
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