Vacuum pump

The utility model discloses a vacuum pump, including the vacuum pump body, it has gas vent and extraction opening to open on the vacuum pump body, and extraction opening department is provided with one -way valve bank spare, and one -way valve bank spare includes valve body, case and spring, open in the valve body have valve pocket and inlet channel, air outlet channel, it has the air inlet to open on the valve body, and opens on the valve body and have the gas outlet, the setting of case portability is provided with the spliced pole on the vacuum pump body in the valve pocket, the extractionopening is offered on the spliced pole, and the one end that the gas outlet was offered to the valve body links to each other with the spliced pole, and the gas outlet of valve body is linked togetherwith the extraction opening, can be connected with the moving part by the pivoted on the valve body, has offered away the gas port on the moving part, and has been formed with the air cavity betweenthe outer wall of the inner