A multifunctional vacuum pump, comprising a shell, a vacuum pump assembly and an oil tank assembly being arranged in the shell, wherein the vacuum pump assembly comprises an oil pump assembly and a motor assembly, a condenser connected to the oil tank assembly is arranged below the oil tank assembly, and an oil inlet tube connecting the condenser and the oil pump assembly is arranged between the condenser and the oil pump assembly;
- the oil tank assembly comprises an oil tank body, and discharge outlets are formed in the oil tank body and connected to the oil pump assembly;
- an oil mist filter assembly is arranged above the discharge outlets and comprises an upper protective cover, a lower protective cover and filter elements;
- an elastic sheet assembly for controlling the discharge outlets to be opened or closed is arranged between the discharge outlets and the upper protective cover;
- a gas ballast assembly connected to the oil pump assembly is arranged on the shell and comprises a rotary knob and a nozzle, and when the rotary knob is rotated with respect to the shell, the nozzle is in an on or off state;
- a gas inlet assembly connected to the oil pump assembly is arranged on the shell, and a gas outlet assembly is arranged on a side face of the oil tank body;
- the oil tank assembly is arranged above the oil pump assembly and further comprises an oil guard and an oil tank cap;
- the oil guard is arranged at an open end of the oil tank body, and the oil tank cap is threadedly connected to the oil tank body;
- a socket extending vertically is arranged on an end cover of the oil tank body, and an indicator light circuit board is arranged in the socket;
- a main control circuit board is arranged below the oil pump assembly, the indicator light circuit board is electrically connected to the gas ballast assembly, and the gas ballast assembly is electrically connected to the main control circuit board;
- the discharge outlets are arranged in a chamber of the oil tank body side-by-side, the elastic sheet assembly is arranged on the discharge outlets, and the oil mist filter assembly fitting the oil tank body is arranged above the elastic sheet assembly;
- a plurality of mounting holes are uniformly formed in a bottom of the oil tank body, and the condenser is arranged below the plurality of mounting holes;
- a sight glass is arranged on an end surface, facing the socket, of the oil tank body, a stationary press plate connected to the oil tank body is arranged on an outer side of the sight glass, and a sealing strip is arranged between the sight glass and the oil tank body;
- the gas outlet assembly is arranged on an outer wall of the oil tank body;
- the gas ballast assembly comprises the rotary knob, the nozzle, a gas ballast link, a copper contact piece, a gas ballast circuit board, a gas ballast plug sleeve, a gas ballast plug and a gas ballast housing;
- the gas ballast link and the rotary knob are mounted on two sides of the shell respectively;
- a mounting groove for mounting the gas ballast link is formed in the shell, and the gas ballast link and the gas ballast plug sleeve are connected and rotate synchronously;
- the gas ballast plug rotating synchronously with the gas ballast plug sleeve is arranged in the gas ballast plug sleeve and disposed around the nozzle;
- the gas ballast housing is disposed around an outer layer of the gas ballast plug sleeve, and the gas ballast plug sleeve is allowed to rotate with respect to the gas ballast housing;
- the gas ballast circuit board is arranged between a head end of the gas ballast housing and the mounting groove, and first fasteners are arranged between the gas ballast housing and the mounting groove;
- the copper contact piece is mounted on the gas ballast link and rotates synchronously with the gas ballast link, and a contact on the copper contact piece faces contacts on the gas ballast circuit board;
- a first vent hole is formed in the gas ballast plug sleeve, a second vent hole is formed in the gas ballast plug, and a third vent hole is formed in the nozzle;
- the gas ballast circuit board is electrically connected to the indicator light circuit board and is further electrically connected to the main control circuit board;
- a vent groove is formed in the gas ballast housing and arranged in an axial direction of the gas ballast housing;
- a cylindrical through-hole is formed in the gas ballast link, a pair of positioning pins are arranged in the cylindrical through-hole, a limit bead is arranged at a tail end of each of the pair of positioning pins and stretches and retracts synchronously with a respective positioning pin of the pair of positioning pins, and a compression spring is arranged between the pair of positioning pins;
- a plurality of limit grooves are uniformly formed in an inner wall of the mounting groove, and an outline of each of the plurality of limit grooves matches an outline of the limit beads;
- the first fasteners sequentially penetrate through the gas ballast housing and the gas ballast circuit board and extend to be mounted in the mounting groove;
- the first vent hole and the second vent hole are arranged coaxially, and the third vent hole faces the vent groove;
- when the first vent hole and the third vent hole are aligned, the gas ballast assembly is in an on state;
- when the first vent hole and the third vent hole are misaligned, the gas ballast assembly is in an off state;
- a first line connecting the nozzle and a second-stage pump housing is arranged between the nozzle and the second-stage pump housing, and a snap ring for fastening the nozzle is arranged on an outer side of the nozzle.