Ordinary micro pump has two inlet and exhaust ports, in the inlet can produce lower than atmospheric pressure (that is, atmospheric pressure) pressure called "negative pressure"; In the exhaust can produce higher than atmospheric pressure pressure is called "positive pressure"; For example, the miniature vacuum pump is a miniature negative pressure pump, and the miniature booster pump is a miniature positive pressure pump.
【 Distinction 】 :
Micro positive pressure pump with micro negative pressure pump is very different. For example, the flow of gas, the micro negative pressure pump is external gas is sucked into the exhaust nozzle; Positive pressure comes from the exhaust nozzle; Let's say the pressure up and down.
In fact, "micro negative pressure pump", "positive pressure pump" is mainly from the function and the main use of artificial discrimination. "Micro negative pressure pump" is mainly used in the vacuum (negative pressure) has a request, such as: pumping, gas analysis, gas circulation, gas sampling, vacuum adsorption, indirect water absorption, etc.; And "positive pressure pump" is mainly used for demand pump as power, stop gas transfer, pressurization of closed vessels, inflatable pump, indirect pressure water, etc., both are often used in medical treatment, scientific research, environmental protection, instruments, control and so on.
The difference between the two is not absolute.
"Micro negative pressure pump" exhaust end is also a positive pressure, but is micro positive pressure, than "positive pressure pump" output pressure is much smaller, such as micro vacuum pump SC series is "micro negative pressure pump", "suction pump", and their exhaust end pressure is often as long as a few kPa;
"Micro positive pressure pump" suction end is also a small negative pressure, to complete the role of pumping. For example, SC series micro air charging pump;
Of course, many times, both request pump suction end can provide higher negative pressure, and demand exhaust end output larger positive pressure, micro pumping, pumping dual-purpose pump SC series, SC5002PM can complete the request well.
For example, SC5002PM, it can provide both -78kpa negative pressure and gt; 200Kpa positive pressure, small volume, pumping, exhaust end can add the valve, plugging can also work normally, to both function, and reduce the cost of the purpose.