Pump device

Patent metadata

Field	Value
Publication number	US-10544787-B2
Application number	US-201715480893-A
Country	US
Kind code	B2
Filing date	Apr 6, 2017
Priority date	Apr 6, 2016
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

A pump device includes a casing, an impeller, a base, and a motor. The casing includes a pump chamber, and an inlet and an outlet. The impeller is accommodated in the pump chamber. The motor is connected to the casing for driving the impeller to rotate and includes a rotor chamber for receiving a rotor. The base is disposed between the impeller and the motor and includes an accommodating groove having an inlet port in communication with the rotor chamber to allow fluid in the pump chamber to enter into the rotor chamber. In the pump device, precipitation has been performed to fluid in the accommodating groove before the fluid enters into the rotor chamber, thus the impurity particles can be prevented from entering into the rotor chamber, thereby prolonging the service life of the pump device.

First claim

The invention claimed is:

1. A pump device comprising:
a casing comprising a pump chamber, and an inlet and an outlet in communication with the pump chamber;
an impeller accommodated in the pump chamber;
a motor connected to the casing for driving the impeller to rotate and comprising a rotor chamber for receiving a rotor; and
a base disposed between the impeller and the motor, wherein the base is provided with an accommodating groove, and an inlet port is defined in the accommodating groove in communication with the rotor chamber to allow fluid in the pump chamber to enter into the rotor chamber,
wherein the base comprises a base body and a first fitting portion protruding from a side of the base body away from the impeller, the first fitting portion is accommodated in the rotor chamber, and a gap is defined between the first fitting portion and a sidewall of the rotor chamber, to allow the fluid to enter into the rotor chamber, a flow inlet is defined in an end of the sidewall of the rotor chamber adjacent the impeller, the gap is defined between the first fitting portion and a bottom portion of the flow inlet, a step is formed on the sidewall of the rotor chamber adjacent the first fitting portion and below the flow inlet, the first fitting portion comprises a lateral side surface facing the sidewall of the rotor chamber, an end surface facing the step, and a connecting surface connected between the lateral side surface and the end surface, the gap comprises a first gap defined between the first fitting portion and the bottom portion of the flow inlet, and a second gap defined between the end surface and the step.

2. The pump device of claim 1 , wherein at least one of the connecting surface and a corner of the bottom portion of the flow inlet facing the connecting surface is slanted or arcuate.

3. The pump device of claim 2 , wherein the first gap between the bottom portion of the flow inlet and the first fitting portion has a minimum size less than 1 mm, or less than or equal to 0.5 mm and greater than or equal to 0.3 mm, or less than or equal to 0.3 mm.

4. The pump device of claim 1 , wherein an annular groove is defined in the sidewall of the rotor chamber above the step, an annular protrusion is formed on the lateral side surface of the first fitting portion and engages in the annular groove, the flow inlet extends through the annular groove and communicates with the rotor chamber.

5. The pump device of claim 1 , wherein the motor comprises a rotor housing, the rotor housing comprises a base member and an accommodating portion provided at the base member, the base member is connected to the casing and a stator of the motor, the rotor chamber is defined in the accommodating portion, the base member concaves around the rotor chamber to form a receiving groove, the flow inlet is in communication with the receiving groove.

6. The pump device of claim 5 , wherein the base further comprises a second fitting portion protruding from the base body, and the second fitting portion is disposed away from the impeller and is accommodated in the receiving groove and engages with a sidewall of the receiving groove away from the rotor chamber.

7. The pump device of claim 6 , wherein the base further comprises a plurality of stopping portions formed on the base body, each of the stopping portions is connected between the first fitting portion and the second fitting portion, the stopping portions are accommodated in the receiving groove such that cavities are defined between the stopping portions.

8. A pump device comprising:
a casing comprising an inlet and an outlet;
an impeller accommodated in the casing;
a motor comprising a stator, a rotor housing connected to the stator and the casing, and a rotor connected to the impeller, the rotor housing comprising a rotor chamber for receiving the rotor; and
a base disposed between the impeller and the rotor housing, wherein the base defines an inlet port to allow fluid in the casing to enter into the rotor housing, and a gap is defined between the rotor housing and the base, to allow the fluid in the rotor housing to enter into the rotor chamber,
wherein the base comprises a base body and a first fitting portion protruding from a side of the base body away from the impeller, the first fitting portion is accommodated in the rotor chamber, a flow inlet is defined in an end of a sidewall of the rotor chamber adjacent the impeller, a step is formed on the sidewall of the rotor chamber adjacent the first fitting portion and below the flow inlet, the first fitting portion comprises a lateral side surface facing the sidewall of the rotor chamber and an end surface facing the step, the gap comprises a first gap defined between the first fitting portion and the bottom portion of the flow inlet, and a second gap defined between the end surface and the step.

9. The pump device of claim 8 , wherein the rotor housing defines a receiving groove around the rotor chamber for receiving the fluid, the base comprises a first fitting portion accommodated in the rotor chamber, and the gap is defined between the first fitting portion and the rotor chamber, for allowing the fluid in the receiving groove to enter into the rotor chamber.

10. The pump device of claim 9 , wherein a sidewall of the rotor chamber defines a flow inlet in communication with the receiving groove, the gap is defined between the first fitting portion and a bottom portion of the flow inlet.

11. The pump device of claim 8 , wherein the inlet port and the gap each has a size less than 1 mm, or less than or equal to 0.5 mm and greater than or equal to 0.3 mm, or less than or equal to 0.3 mm.

12. The pump device of claim 1 , wherein a flange protrudes from one side of the base away from the motor, the flange surrounds the impeller, and the accommodating groove is defined in the flange.

13. The pump device of claim 12 , wherein a cover part is formed on the sidewall of the pump chamber, the cover part covers the accommodating groove, the inlet port is defined in a sidewall of the accommodating groove adjacent the impeller, allowing the fluid to enter into the accommodating groove through the inlet port.

14. The pump device of claim 13 , wherein the inlet port is defined in a top surface of the sidewall of the accommodating groove adjacent the impeller.

15. The pump device of claim 14 , wherein a gap between a bottom side of the inlet port and the cover part has a size less than 1 mm, or less than or equal to 0.5 mm and greater than or equal to 0.3 mm, or less than or equal to 0.3 mm.

16. The pump device of claim 1 , further comprising a heating assembly disposed in the casing for heating fluid.

17. The pump device of claim 8 , wherein the base is provided with an accommodating groove for receiving the fluid, and the inlet port is defined in a sidewall of the accommodating groove.

Assignees

• Johnson Electric Sa
• Johnson Electric Int Ag

Inventors

• Li Min
• Chong Kok Ang
• Xie Xiao Bo
• Mo Shao Peng

Classifications

• F04D7/04

  the fluids being viscous or non-homogenous · CPC title

• F04D1/025 Primary

  Comprising axial and radial stages · CPC title

• F04D29/426 Primary

  especially adapted for liquid pumps · CPC title

• F04D13/0606 Primary

  Canned motor pumps · CPC title

• F04D29/445

  especially adapted for liquid pumps · CPC title