Compact sound suppressing muffler for breast vacuum pumps

A sound suppression system for reducing or eliminating sound produced by the operation of a breast vacuum pump, comprising:

• a. a sound suppressing muffler assembly having an air entry port, said air entry port adapted to communicate with an air outlet port of said vacuum pump;
• b. the sound suppressing muffler assembly including a first path for air to pass through upon emerging from said air entry port;
• c. the sound suppressing muffler assembly including a second path for the air emerging from the first path to pass through, said second path circumscribing said first path;
• d. the sound suppressing muffler assembly also including at least one opening in a muffler housing, the air in said second path passing through said at least one opening to atmosphere;
• e. said first and second paths absorbing sound energy from said air as said air moves through said first and second paths;
• f. at least one of said first and second paths includes a low density porous foam structure through which said air passes, said low density porous foam structure absorbing said sound energy as said air moves through said first path.

A sound suppression system for reducing or eliminating sound produced by the operation of a breast vacuum pump, comprising:

• a sound suppressing muffler assembly having an air entry port, said air entry port adapted to communicate with an air outlet port of said vacuum pump;
• said sound suppressing muffler assembly having a housing defining a first internal space communicating with said air entry port and a second internal space communicating with an opening in said housing, said opening communicating with atmosphere, said second internal space circumscribing said first internal space;
• a first porous foam sound absorbing structure disposed in said first internal space, and a second porous foam sound absorbing structure disposed in said second internal space;
• said first and second internal spaces communicating with each other, air passing through said first internal space in a first direction, and next passing through said second internal space in a second direction, and next passing through said opening in said housing;
• said housing including a hollow tubular support, a hollow portion of said tubular support defining said first internal space, said first porous foam sound absorbing structure disposed in said first internal space;
• said housing further including a second internal space defined by an outer circumference of said hollow tubular support and an internal surface of said housing, said second porous foam sound absorbing structure disposed in said second internal space;
• said first and second porous foam sound absorbing structures absorbing sound energy as said air passes through said air entry port, through said first and second porous foam sound absorbing structures, and through said opening in said housing to atmosphere.

A sound suppression system for reducing or eliminating sound produced by a source of air flow, comprising:

• a sound suppressing muffler assembly having an air entry port, said air entry port adapted to communicate with an air outlet port of an air flow generating device;
• said sound suppressing muffler assembly having a housing defining a first internal space communicating with said air entry port and a second internal space communicating with an opening in said housing, said opening leading to atmosphere and said second internal space circumscribing said first internal space;
• a first porous foam sound absorbing structure disposed in said first internal space, and a second porous foam sound absorbing structure disposed in said second internal space;
• said first and second internal spaces communicating with each other, air passing through said first internal space in a first direction, and next passing through said second internal space in a second direction, and next passing through said opening in said housing;
• said housing including a hollow tubular support, a hollow portion of said tubular support defining said first internal space, said first porous foam sound absorbing structure disposed in said first internal space;
• said second internal space defined by an outer circumference of said hollow tubular support and an internal surface of said housing, said second porous foam sound absorbing structure disposed in said second internal space;
• said first and second porous foam sound absorbing structures absorbing sound energy as said air passes through said air entry port, through said first and second porous foam sound absorbing structures in different directions, and through said opening in said housing to atmosphere.