Liquid pump

Patent metadata

Field	Value
Publication number	US-10100831-B2
Application number	US-201414226667-A
Country	US
Kind code	B2
Filing date	Mar 26, 2014
Priority date	Mar 26, 2013
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

A liquid pump includes a pump assembly attached to a motor. The pump assembly includes an inlet chamber and pump chamber. The pump chamber accommodates a drive gear driven by an output shaft of the motor and driven gear meshed with the drive gear. An inner cover is disposed within the pump chamber. An outer cover overlies the inner cover with an elastic member disposed there between. The outer cover exerts a force to the inner cover through the elastic member and holds the inner cover in sliding contact with an axial end of the drive and driven gears. An outlet chamber formed between the inner cover and the outer cover is in fluid communication with and the pump chamber.

First claim

The invention claimed is:

1. A liquid pump driven by a motor having an output shaft, comprising:
an outer shell including at least a first shell portion having a bottom wall;
an inlet;
a seal;
an inlet chamber in fluid communication with the inlet and having a hole through which the output shaft of the motor extends through;
a pump chamber having a first through hole through which the output shaft of the motor extends through and a second through hole in fluid communication with the inlet chamber, the seal sealing an interface between the output shaft and the hole in the inlet chamber, the pump chamber being separated from the inlet chamber by the bottom wall, and the second through hole being disposed within the bottom wall;
a pump mechanism disposed in the pump chamber and mechanically coupled to the output shaft of the motor; and an outlet in fluid communication with the pump chamber; wherein a fluid pressure in the inlet chamber is less than a fluid pressure in the pump chamber; wherein the pump chamber is positioned downstream of the inlet chamber such that liquid flowing through the inlet first enters the inlet chamber and then flows to the pump chamber;
an inner cover disposed within the pump chamber and in sliding contact with the pump mechanism; an outer cover disposed over the inner cover; and an elastic member disposed between the inner cover and the outer cover, wherein: the inner cover, the outer cover, and the elastic member disposed there between define an outlet chamber in fluid communication with the pump chamber; and the outlet is in fluid communication with the pump chamber through the outlet chamber; and
the pump chamber has a groove formed on a sidewall thereof; the elastic member has a notch formed on a periphery thereof; and the outlet chamber is in fluid communication with the pump chamber through the groove on the sidewall of the pump chamber and the notch at the periphery of the elastic member.

2. The liquid pump of claim 1 , wherein the inlet chamber is disposed between the motor and the pump chamber along an axial direction of the output shaft of the motor such that the output shaft first extends through the inlet chamber and then enters the pump chamber.

3. The liquid pump of claim 1 , wherein the inlet chamber includes a convex surface on a side thereof adjacent the motor.

4. The liquid pump of claim 1 , wherein the pump mechanism comprises:
a drive gear coupled the output shaft; and
a driven gear that meshes with the drive gear, such that the drive gear and the driven gear are configured to rotate synchronously in opposite directions.

5. The liquid pump of claim 1 , wherein the elastic member comprises rubber or silicone.

6. The liquid pump of claim 1 , wherein the inlet and the outlet extend in a direction parallel to an axial direction of the output shaft of the motor.

7. A liquid pump, comprising:
an outer shell including at least a first shell portion having a bottom wall;
a motor having an output shaft;
an inlet;
a pump chamber in fluid communication with the inlet;
a pump mechanism disposed in the pump chamber and mechanically coupled to the output shaft of the motor;
an inner cover disposed within the pump chamber and in sliding contact with the pump mechanism; an outer cover disposed over the inner cover;
an elastic member disposed between the inner cover and the outer cover, wherein the inner cover, the outer cover, and the elastic member disposed there between define an outlet chamber in fluid communication with the pump chamber;
an outlet in fluid communication with the outlet chamber; and an inlet chamber in fluid communication with the pump chamber;
a seal sealing an interface between the output shaft and a hole in the inlet chamber,
wherein the inlet is in fluid communication with the pump chamber through the inlet chamber such that liquid flowing through the inlet first enters the inlet chamber and then flows to the pump chamber, and the pump chamber is separated from the inlet chamber by the bottom wall; and
the pump chamber has a groove formed on a sidewall thereof;
the elastic member has a notch formed on a periphery thereof; and
the outlet chamber is in fluid communication with the pump chamber through the groove on the sidewall of the pump chamber and the notch at the periphery of the elastic member.

8. The liquid pump of claim 7 , wherein the pump mechanism comprises:
a drive gear coupled the output shaft; and
a driven gear that meshes with the drive gear, such that the drive gear and the driven gear are configured to rotate synchronously in opposite directions.

9. The liquid pump of claim 7 , wherein the inlet chamber is disposed between the motor and the pump chamber along an axial direction of the output shaft of the motor such that the output shaft first extends through the inlet chamber and then enters the pump chamber.

10. The liquid pump of claim 9 , wherein the inlet chamber includes a convex surface on a side thereof adjacent the motor.

Assignees

• Johnson Electric Sa

Inventors

• Wu Chunfa
• Zuo Jie

Classifications

• F04C15/0026

  Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps · CPC title

• F05C2225/00

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

• F04C2/102

  the two members rotating simultaneously around their respective axes · CPC title

• F04C15/0015

  of resilient material · CPC title

• F04C15/0003

  Sealing arrangements in rotary-piston machines or pumps (sealing in general F16J) · CPC title