Vacuum pump e.g. vane cell pump for brake-force booster of motor vehicle, comprises housing, at which suction port and pressure port is arranged, and conveyor, where housing and conveyor comprise suction chamber

摘要

The vacuum pump (10) comprises a housing (12), at which a suction port (14) and a pressure port (16) is arranged, and a conveyor such as a wing. The housing and the conveyor comprise a suction chamber, into which the suction port opens, and a pressure chamber, into which the pressure port opens. A valve is arranged in the suction port and designed such that the valve, in its normal position, releases a fluid flow from the suction chamber via the suction port and locks a fluid flow into the suction chamber via the suction port. The vacuum pump (10) comprises a housing (12), at which a suction port (14) and a pressure port (16) is arranged, and a conveyor such as a wing. The housing and the conveyor comprise a suction chamber, into which the suction port opens, and a pressure chamber, into which the pressure port opens. A valve is arranged in the suction port and designed such that the valve, in its normal position, releases a fluid flow from the suction chamber via the suction port and locks a fluid flow into the suction chamber via the suction port. The valve, in a pressure relief position, opens for fluid flow through the suction port from the suction chamber when a pressure in the suction chamber is greater than a predetermined value, which lies in the range of 3 bar. The valve opens for fluid flow from the suction chamber via the suction port when a pressure in the suction chamber is higher by a predetermined value than a pressure upstream of the suction port.