Metering pump made of plastic

Patent metadata

Field	Value
Publication number	US-10060431-B2
Application number	US-201314390818-A
Country	US
Kind code	B2
Filing date	Feb 14, 2013
Priority date	Apr 4, 2012
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

The invention relates to a metering pump (1) made of plastic, with two rotors (10) coupled to one another via gears (11) and drivable in opposite directions, which are seated in a pump housing (5) equipped with suction ports (6) and outlet ports (7), wherein each rotor (10) has a rotor shaft (12), the rotor shaft ends (15) of which are seated in the walls (8, 4) of the pump housing (5). Each rotor (10) has two rotor blade walls (13) arranged diametrically on the rotor shaft (12), a partially cylindrical rotor blade shoe (14) being formed at each of the peripheral ends of said rotor blade walls, wherein the rotor blade shoes (14) on the one hand contact the cylindrical inside wall regions of the pump housing (5) and on the other contact the rotor blade shafts (13) of the adjacent rotor (10) in a sliding and sealing manner.

First claim

The invention claimed is:

1. A metering pump ( 1 ), made of plastic, comprising two rotors ( 10 ), which are coupled to one another via gearwheels ( 11 ) and are drivable in opposite directions and which are mounted in a pump housing ( 5 ) provided with a suction port ( 6 ) and an outlet port ( 7 ), wherein each of the rotors ( 10 ) has a rotor shaft ( 12 ), rotor shaft ends ( 15 ) of which are seated in walls ( 8 , 4 ) of the pump housing ( 5 ), and a rotor shaft axis (A), characterized in that each of the rotors ( 10 ) has two rotor blade walls ( 13 ), which are disposed diametrically on the rotor shaft ( 12 ) and onto peripheral ends of which are respectively molded partially cylindrical rotor blade shoes ( 14 ), wherein the rotor blade shoes ( 14 ) bear slidingly and sealingly against cylindrical inner wall regions of the pump housing ( 5 ), on the one hand, and against the rotor blade shafts ( 13 ) of the adjacent rotor ( 10 ), on the other hand, wherein the pump has an end wall ( 8 ) fixedly connected to the pump housing ( 5 ) and a detachable end wall ( 9 ), wherein the end wall ( 8 ) fixedly connected to the pump housing ( 5 ) defines both an open bearing sleeve ( 30 ) and an outwardly closed bearing sleeve ( 29 ), wherein at least one rotor shaft end ( 15 ) has a drive coupling part ( 16 ), which passes through the pump housing ( 5 ) and passes through the end wall fixedly connected to the pump housing ( 5 ), wherein both of the rotors ( 10 ) are identical and both thus have one of the drive coupling parts ( 16 ), and wherein one of the drive coupling parts ( 16 ) is seated in the open bearing sleeve ( 30 ) and the other drive coupling part ( 16 ) is seated in the outwardly closed bearing sleeve ( 29 ).

2. The metering pump as claimed in claim 1 , wherein the metering pump is disposable.

3. The metering pump as claimed in claim 1 , wherein one of the respective gearwheels ( 11 ) is molded in one piece onto one of the rotor shafts ( 12 ), and another of the respective gearwheels ( 11 ) is molded in one piece onto the other rotor shaft ( 12 ).

4. The metering pump ( 1 ) as claimed in claim 1 , characterized in that each of the rotor blade shoes ( 14 ) has on an outer face ( 21 ) at least one leading sealing scraping edge ( 23 ), which runs parallel to the rotor axis (A) and which is disposed close to, in a rotational direction, a leading end edge ( 22 ) of a respective rotor blade shoe ( 14 ).

5. The metering pump ( 1 ) as claimed in claim 4 , characterized in that on each rotor blade shoe ( 14 ) is respectively disposed a trailing sealing scraping edge ( 23 ), which runs parallel to the rotor axis (A) and is close to a trailing end edge ( 22 ) of the respective rotor blade shoe.

6. The metering pump ( 1 ) as claimed in claim 5 , characterized in that, in a region between each leading and trailing sealing scraping edge ( 23 ) and the rotor blade wall ( 13 ), a joint groove ( 25 ) is disposed on an inner face ( 24 ) of the rotor blade shoe ( 14 ), the inner face being on a side of the rotor blade shoe opposite the outer face.

7. The metering pump ( 1 ) as claimed in claim 1 , characterized in that into the open bearing sleeve ( 30 ) is molded, in one piece, at least one circumferential sealing lip ( 31 ).

8. The metering pump ( 1 ) as claimed in claim 1 , characterized in that on the two rotor blade walls ( 13 ) of each rotor ( 10 ), in end sides ( 26 ) remote from the gearwheels ( 11 ), is provided at least one sealing lip ( 27 ) for sealing contact against the detachable end wall ( 9 ) of the pump housing ( 5 ).

9. The metering pump ( 1 ) as claimed in claim 1 , characterized in that between the two rotor blade walls ( 13 ) of each rotor ( 10 ), on both sides of the rotor shaft ( 12 ), are arranged two parallel longitudinal stripping ribs ( 28 ).

10. The metering pump ( 1 ) as claimed in claim 1 , characterized in that the suction port ( 6 ) is provided with cutting and/or perforating opening means ( 17 ) and a mounting socket ( 3 ) with a flange ( 4 ), which mounting socket is configured to be welded onto a container wall.

11. The metering pump ( 1 ) as claimed in claim 1 , characterized in that the outlet port ( 7 ) is provided with a closing cap ( 18 ).

12. The metering pump ( 1 ) as claimed in claim 1 , characterized in that closed bearing bushes ( 19 ) for both rotors ( 10 ) are molded into the detachable end wall ( 9 ) of the pump housing ( 5 ).

Assignees

• Bosch Gmbh Robert

Inventors

• Barron Dan

Classifications

• F04D1/003

  Having contrarotating parts · CPC title

• F04C2/123

  with radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth · CPC title

• F04C2/12

  of other than internal-axis type · CPC title

• F04B13/02 Primary

  of two or more fluids at the same time · CPC title

• F04C2/24 Primary

  of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions · CPC title