Piston-type breast pump

1. A piston-type breast pump which includes a housing and a piston-type pumping arrangement received in the housing, comprising:

a DC motor, a gear reducer and a control circuit which are received in the housing;

a gear swing unit operatively communicated with said gear reducer and connected to said pumping arrangement;

first and second position sensor plates for detecting a far point position and a near point position respectively provided between said gear swing unit and said gear reducer;

a buffer spring connected to said gear swing unit;

a stroke sensor wheel positioned on an axis member of said DC motor; and

a speed control button, stroke control button, a promoting lactation button and a suction adjustment screw positioned on an outer side of said housing;

wherein said housing has a vertical design having an indented portion defining a bottle side support on said housing and comprising a bottle bottom support provided thereon in a detachable manner.

2. A piston-type breast pump, as recited in claim 1 , wherein said housing comprises a front housing member, a rear housing member and a bottom housing member for forming said housing, wherein said speed control button, said stroke control button and said promoting lactation button are provided on said front housing member and communicatively connected to said control circuit, wherein said bottle side support is constructed into a semicircle structure having a bottom end operatively connected with said bottle bottom support for retaining a milk bottle into position, wherein said front housing member further provides an output head arranged for connecting to the milk bottle through a bottle connecting tube, wherein said suction adjustment screw is positioned on said rear housing member.

3. A piston-type breast pump, as recited in claim 2 , wherein said gear reducer comprises an axis support connected to said bottom housing member; a first axis, a second axis, a gear swing core axis positioned and supported in sequence through an inclined surface defined through a supporting side of said axis support; a gear connected to a middle portion of said first axis; a gear pulley connected to an end portion of said first axis; a second gear provided to a middle portion of said second axis operatively connected to said gear of said first axis, a third gear provided at one end portion of said second gear complementary to a teeth surface of said gear swing unit; a gear swing axis provided at one end of said gear swing unit through which said piston-typed pumping arrangement is connected; a motor pulley connected to said gear pulley through a belt arranged for connecting said gear pulley to said DC motor, wherein said gear has a size smaller than said second gear, and said second gear has a size larger than said third gear.

4. A piston-type breast pump, as recited in claim 3 , wherein said buffer spring is inserted to connecting to said gear swing core axis in an enclosed manner, wherein said buffer spring has two ends defining to force receiving portions which are provided to said gear swing unit and to said axis support respectively.

5. A piston-type breast pump, as recited in claim 3 , further comprising two photoelectric sensors positioned corresponding to said first and second position sensor plates respectively in which said first and second position sensor plates have a protruded structural construction.

6. A piston-type breast pump, as recited in claim 3 , wherein said stroke sensor wheel and said motor pulley are connected, wherein said stroke sensor wheel has two indented portions, wherein said stroke sensor wheel comprises photoelectric sensor corresponding to said stroke sensor wheel on an outer side of said stroke sensor wheel.

7. A piston-type breast pump, as recited in claim 2 , further comprising a frame unit connected to said bottom housing member and a control valve support through and provided on said frame unit, wherein said piston-typed pumping arrangement comprises a cylinder defining a cylinder cavity, a piston unit operatively provided in said cylinder cavity; and an output tube and a connecting output provided at one end portion of said cylinder, wherein said output tube is connected to an output head of said front housing member, wherein said end portion of said cylinder is connected to said frame unit in a hinged manner, wherein said control valve is connected to said connecting output through said output tube.

8. A piston-type breast pump, as recited in claim 7 , wherein said control valve has a valve body, a valve core and a suction adjustment screw for forming said control valve, wherein said valve core has a cone structure at a first end and a plurality of thread construction at second end opposite to said first end, wherein said valve body has a core receiving cavity arranged for receiving and connecting said valve core, wherein said valve body has an input opening and an output opening which are channeled through said core receiving cavity respectively, wherein said valve body is supported by said frame unit, wherein said suction adjustment screw is connected with said valve core and extended to penetrate to an outer side of said rear housing member, wherein said input opening is connected to said connecting output through a tube.

9. A piston-type breast pump, as recited in claim 2 , wherein said bottle bottom support comprises a connecting leg and a position member, wherein said housing has a position groove and a connecting hole corresponding to a position of said connecting leg and said position member respectively, wherein said connecting leg has a position hole and an inclined surface provided thereon.

10. A piston-type breast pump, as recited in claim 1 , wherein said gear reducer comprises an axis support connected to said bottom housing member; a first axis, a second axis, a gear swing core axis positioned and supported in sequence through an inclined surface defined through a supporting side of said axis support; a gear connected to a middle portion of said first axis; a gear pulley connected to an end portion of said first axis; a second gear provided to a middle portion of said second axis operatively connected to said gear of said first axis, a third gear provided at one end portion of said second gear complementary to a teeth surface of said gear swing unit; a gear swing axis provided at one end of said gear swing unit through which said piston-typed pumping arrangement is connected; a motor pulley connected to said gear pulley through a belt arranged for connecting said gear pulley to said DC motor, wherein said gear has a size smaller than said second gear, and said second gear has a size larger than said third gear.

11. A piston-type breast pump, as recited in claim 10 , wherein said buffer spring is inserted to connecting to said gear swing core axis in an enclosed manner, wherein said buffer spring has two ends defining to force receiving portions which are provided to said gear swing unit and to said axis support respectively.

12. A piston-type breast pump, as recited in claim 10 , further comprising two photoelectric sensors positioned corresponding to said first and second position sensor plates respectively in which said first and second position sensor plates have a protruded structural construction.

13. A piston-type breast pump, as recited in claim 10 , wherein said stroke sensor wheel and said motor pulley are connected, wherein said stroke sensor wheel has two indented portions, wherein said stroke sensor wheel comprises photoelectric sensor corresponding to said stroke sensor wheel on an outer side of said stroke sensor wheel.

14. A piston-type breast pump, as recited in claim 1 , further comprising a frame unit connected to said bottom housing member and a control valve support through and provided on said frame unit, wherein said piston-typed pumping arrangement comprises a cylinder defining a cylinder cavity, a piston unit operatively provided in said cylinder cavity; and an output tube and a connecting output provided at one end portion of said cylinder, wherein said output tube is connected to an output head of said front housing member, wherein said end portion of said cylinder is connected to said frame unit in a hinged manner, wherein said control valve is connected to said connecting output through said output tube.

15. A piston-type breast pump, as recited in claim 14 , wherein said control valve has a valve body, a valve core and a suction adjustment screw for forming said control valve, wherein said valve core has a cone structure at a first end and a plurality of thread construction at second end opposite to said first end, wherein said valve body has a core receiving cavity arranged for receiving and connecting said valve core, wherein said valve body has an input opening and an output opening which are channeled through said core receiving cavity respectively, wherein said valve body is supported by said frame unit, wherein said suction adjustment screw is connected with said valve core and extended to penetrate to an outer side of said rear housing member, wherein said input opening is connected to said connecting output through a tube.

16. A piston-type breast pump, as recited in claim 1 , wherein said bottle bottom support comprises a connecting leg and a position member, wherein said housing has a position groove and a connecting hole corresponding to a position of said connecting leg and said position member respectively, wherein said connecting leg has a position hole and an inclined surface provided thereon.