The term "small vacuum pump" refers specifically to a *miniature* vacuum pump; due to their compact dimensions, miniature vacuum pumps are commonly referred to as small vacuum pumps. A miniature vacuum pump (i.e., a small vacuum pump) is defined as a device featuring a single intake port and a single exhaust port, capable of continuously generating a vacuum or negative pressure at the intake while simultaneously creating a slight positive pressure at the exhaust. Its primary working medium is gas, and it is characterized by its diminutive size.
If a sealed container (initially at standard atmospheric pressure of 100 kPa) is connected to a miniature vacuum pump and subjected to continuous evacuation, the gas pressure within the container will eventually drop below atmospheric pressure, reaching an absolute pressure of 60 kPa. Furthermore-thanks to specialized technical enhancements-the technology has evolved beyond simple vacuum-only models to include dual-function miniature pumps capable of both vacuuming and pumping (i.e., the exhaust port can generate significant positive pressure). These dual-function pumps are utilized for applications such as pressurization, inflation, and overcoming system resistance. Additionally, there exists a highly unique type of miniature pump capable of handling both water and gas; unlike standard water pumps-which typically suffer damage if allowed to idle or run dry-this specialized pump is designed to operate reliably in scenarios requiring prolonged idling or dry-running conditions.
