Liquid gear pump

Patent metadata

Field	Value
Publication number	US-9765772-B2
Application number	US-201213486506-A
Country	US
Kind code	B2
Filing date	Jun 1, 2012
Priority date	Jun 1, 2011
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A liquid gear pump includes a gear pump assembly and an electric motor with an motor shaft. The gear pump assembly includes a pump housing which defines a pump chamber, an inlet and an outlet which are in fluid communication with the pump chamber, and a driving gear and an idle gear which are received in the pump chamber. The driving gear is driven by the motor shaft. The idle gear is supported on an idle shaft and engaged with the driving gear. The driving gear and the idle gear are made of a material with a main component of PPS.

First claim

The invention claimed is:

1. A liquid gear pump, comprising:
an electric motor having a motor shaft;
a pump housing having a pump chamber with an inner surface and an open side, an inlet and an outlet in fluid communication with the pump chamber;
a driving gear and an idle gear disposed within the pump chamber with a gap left between radial tips of teeth of both the driving and idle gears and the inner surface of the pump chamber, the driving gear being driven by the motor shaft, the idle gear being supported on an idle shaft and engaged with the driving gear;
an inner cover plate closing the open side of the pump chamber;
an inner ring wall radially spaced outward from an edge of the pump chamber to form a first shoulder between the edge and the inner ring wall to support the inner cover plate, the inner ring wall having a top surface forming a second shoulder;
an outer ring wall having a higher height than the inner ring wall and surrounding the inner ring wall and having an outer ring wall top surface;
an outer cover plate fixed to the pump housing on the outer ring wall top surface and over the inner cover plate;
an elastic sealing gasket, seated on the second shoulder and matched an inner peripheral surface of the outer ring wall, between the inner and outer cover plates and compressed by the outer cover plate against the inner cover plate, the elastic sealing gasket allowing the inner cover plate to move between the pump chamber and the outer cover plate; and
wherein the driving gear and the idle gear are made of a material with a main component of polyphenylene sulfide, and
wherein the material contains 40 to 80 percent by weight of polyphenylene sulfide.

2. The liquid gear pump of claim 1 , wherein the driving gear and the idle gear are made of a material with main components of polyphenylene sulfide and glass fiber.

3. The liquid gear pump of claim 2 , wherein the material contains 20 to 60 percent by weight of glass fiber.

4. The liquid gear pump of claim 1 , wherein the idle shaft is made of ceramic.

5. The liquid gear pump of claim 1 , further comprising:
an intermediate plate fixed to the pump housing at one side near the motor; and
a mounting plate between the pump housing and the motor and mounting the pump housing to the motor.

6. The liquid gear pump of claim 1 , wherein a shaft seal is sealingly sleeved on the motor shaft to prevent the liquid from leaking out of the pump chamber along the motor shaft.

7. A beverage dispenser comprising:
a beverage supply line; and
a gear pump connected to the beverage supply line, comprising:
an electric motor having a motor shaft;
a bearing disposed on the motor shaft;
a solid bearing holder sleeved around the bearing;
a pump housing having a pump chamber with an inner surface and an open side, an inlet and an outlet in fluid communication with the pump chamber;
a driving gear disposed within the pump chamber and driven by the motor shaft;
an idle gear disposed within the pump chamber, being supported on an idle shaft and engaged with the driving gear, a gap being left between radial tips of teeth of both the driving and idle gears and the inner surface of the pump chamber;
a boss projecting away from the pump housing and supporting the idle shaft;
a plate assembled between the pump housing and the motor and having an opening with a first area receiving the bearing holder and a second area receiving the boss, the first area of the opening communicated with the second area of the opening;
an inner cover plate closing the open side of the pump chamber;
an inner ring wall radially spaced outward from an edge of the pump chamber to form a first shoulder between the edge and the inner ring wall to support the inner cover plate, the inner ring wall having a top surface forming a second shoulder;
an outer ring wall having a higher height than the inner ring wall to surround the inner ring wall and having an outer ring wall top surface;
an outer cover plate fixed to the pump housing on the outer ring wall top surface and over the inner cover plate;
an elastic sealing gasket, seated on the second shoulder, between the inner and outer cover plates and compressed by the outer cover plate against the inner cover plate, the elastic sealing gasket allowing the inner cover plate to move between the pump chamber and the outer cover plate; and
wherein the driving gear and the idle gear are made of a material with a main component of polyphenylene sulfide and the material contains 40 to 80 percent by weight of polyphenylene sulfide.

8. The beverage dispenser of claim 7 , wherein the driving gear and the idle gear are made of a material with main components of polyphenylene sulfide and glass fiber.

9. The beverage dispenser of claim 8 , wherein the material contains 20 to 60 percent by weight of glass fiber.

10. The beverage dispenser of claim 7 , wherein the idle shaft is made of ceramic.

11. The beverage dispenser of claim 7 , wherein the gear pump further comprises an outer cover plate fixed to the pump housing at one side away from the motor, and a mounting plate arranged between said plate and the motor and mounting the pump housing to the motor.

12. The beverage dispenser of claim 7 , wherein a shaft seal is sealingly sleeved on the motor shaft to prevent the liquid from leaking out of the pump chamber along the motor shaft.

13. An automatic beverage dispenser incorporating the liquid gear pump of claim 1 .

14. The liquid gear pump of claim 1 , wherein:
the inner ring wall is positioned at the open side of the pump chamber with the first shoulder provided at an inner side of the ring wall;
the inner cover plate matches an inner peripheral surface of the inner ring wall, and is axially aligned with an upper surface of the inner ring wall; and
the sealing gasket covers the join between the inner cover plate and the upper surface of the inner ring wall.

15. The liquid gear pump of claim 14 , wherein an outer surface of the sealing gasket contacts an inner peripheral surface of the outer ring wall surrounding the inner ring wall.

16. The liquid gear pump of claim 5 , wherein:
the liquid gear pump further comprises:
a bearing disposed on the motor shaft;
a bearing holder sleeved around the bearing; and
a boss projecting away from the pump housing and supporting the idle shaft; and
the intermediate plate is arranged between the pump housing and the motor and has an opening with a first area receiving the bearing holder and a second area receiving the boss.

17. The beverage dispenser of claim 7 , wherein:
the inner ring wall is positioned at the open side of the pump chamber with the first shoulder provided at an inner side of the ring wall;
the inner cover plate matches an inner peripheral surface of the inner ring wall, and is axially aligned with an upper surface of the inner ring wall; and
the sealing gasket covers the join between the inner cover plate and the upper surface of the inner ring wall.

18. The liquid gear pump of claim 1 , wherein the inlet and outlet directly and outwardly extend from two opposite side walls of the pump chamber.

19. The liquid gear pump of claim 16 , wherein the boss has a bottom wall to support the idle shaft.

Assignees

• Kwok Lo Ching
• Wu Chun Fa
• Johnson Electric Sa

Inventors

• Kwok Lo Ching
• Wu Chun Fa

Classifications

• F04C2/18

  with similar tooth forms (F04C2/16 takes precedence) · CPC title

• F05C2225/00

  Synthetic polymers, e.g. plastics; Rubber · CPC title

• F04C2/086

  Carter · CPC title

• F04C2/084 Primary

  Toothed wheels · CPC title

• F04C2220/24

  for metering throughflow · CPC title