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1. (US20190113036) VACUUM PUMP HAVING A SILENCER
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Claims

1. A vacuum pump, in particular a two-shaft vacuum pump, comprising
a pump housing defining a suction chamber and having a gas inlet and a gas outlet,
rotor elements arranged in said suction chamber for forming a plurality of successive pump stages,
an inlet duct for gas ballast connected to one of said pump stages, and
at least one sound expansion space arranged between duct sections of said inlet duct and integrated into said pump housing.
2. A vacuum pump, in particular a two-shaft vacuum pump, comprising
a pump housing defining a suction chamber and having a gas inlet and a gas outlet,
rotor elements arranged in said suction chamber for forming a plurality of successive pump stages,
a discharge duct connected to said gas outlet, and
at least one sound expansion space arranged between duct sections of said discharge duct and integrated into said pump housing.
3. The vacuum pump according to claim 1, further comprising
a discharge duct connected to the gas outlet, and
the at least one sound expansion space arranged between duct sections of said discharge duct and integrated into the pump housing.
4. The vacuum pump according to claim 1, wherein the at least one sound expansion space is arranged in a housing cover and/or a housing wall.
5. The vacuum pump according to claim 1, wherein at an inlet opening of the sound expansion space a multiple increase of the cross-section is realized.
6. The vacuum pump according to claim 1, wherein two identically configured sound expansion spaces are arranged one behind the other in the direction of flow.
7. The vacuum pump according to claim 1, wherein in the inlet duct at least two identically configured sound expansion spaces and in the outlet duct at least two identically configured sound expansion spaces are arranged.
8. The vacuum pump according to claim 1, wherein an inlet opening and an outlet opening of the at least one sound expansion space are arranged in a staggered manner relative to each other.
9. The vacuum pump according to claim 1, further comprising a gas ballast inlet which is open against the atmosphere or a rotary valve which is provided at the gas ballast inlet.
10. The vacuum pump according to claim 1, further comprising at least one duct section has connected thereto a pipe section projecting into the at least one sound expansion space.