Rotor stator pump

Patent metadata

Field	Value
Publication number	US-12486844-B2
Application number	US-202218703555-A
Country	US
Kind code	B2
Filing date	Oct 24, 2022
Priority date	Oct 25, 2021
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

Abstract

A rotor stator pump includes a rotating helical component and a static helical component. An electric motor is connected to the rotating helical component to drive rotation of the rotating helical component. The rotating helical component and the static helical component are disposed radially inward of the motor rotor of the electric motor.

First claim

The invention claimed is:

1 . A pump comprising:
an electric motor including a motor rotor configured to rotate on an axis and a motor stator disposed to electromagnetically drive rotation of the motor rotor; a pump stator disposed radially inward of the electric motor; and a helical rotor rod disposed at least partially within the pump stator, the helical rotor rod configured to rotate relative to the pump stator to form a series of progressing cavities to drive material along a cavity channel of the pump stator, the helical rotor rod connected to the electric motor to be rotated by the electric motor; an outer drive that extends axially outward from the electric motor in a first axial direction along a pump axis, the outer drive configured to rotate on the pump axis; and an inner drive connected to the outer drive to be rotated by the outer drive, wherein the inner drive extends in a second axial direction opposite to the first axial direction from the outer drive to the helical rotor rod to connect between the outer drive and the helical rotor rod, the inner drive configured to transmit rotational motion from the outer drive to the helical rotor rod such that the helical rotor rod rotates 1:1 with the motor rotor.

2 . The pump of claim 1 , wherein the pump stator radially overlaps with at least a portion of the electric motor.

3 . The pump of claim 2 , wherein the pump stator radially overlaps with all electromagnetic components of the motor stator of the electric motor.

4 . The pump of any claim 1 , wherein the pump stator extends fully axially through the motor.

5 . The pump of claim 1 , wherein the helical rotor rod extends fully axially through the motor.

6 . The pump of claim 1 , wherein a radial line extending from a pump axis of the pump passes through the helical rotor rod, then the pump stator, then the electric motor.

7 . The pump of claim 1 , wherein:
the motor rotor is configured to rotate on a pump axis on which the helical rotor rod is configured to rotate; and the motor stator disposed around the motor rotor.

8 . The pump of claim 7 , wherein a rotational output from the motor rotor is transmitted in a first axial direction along the pump axis to a linkage to drive rotation of the linkage, and wherein rotational motion is transmitted from the linkage to the helical rotor rod in a second axial direction along the pump axis, the second axial direction opposite the first axial direction.

9 . The pump of claim 8 , wherein the linkage is disposed axially outward from the cavity channel.

10 . The pump of claim 1 , wherein the outer drive is at least partially formed by a motor rotor body of the motor rotor of the electric motor.

11 . A pump comprising:
an electric motor including a motor rotor configured to rotate on an axis and a motor stator disposed to electromagnetically drive rotation of the motor rotor; a pump stator disposed radially inward of the electric motor; and a helical rotor rod disposed at least partially within the pump stator, the helical rotor rod configured to rotate relative to the pump stator to form a series of progressing cavities to drive material along a cavity channel of the pump stator, the helical rotor rod connected to the electric motor to be rotated by the electric motor; an outer drive that extends axially outward from the electric motor in a first axial direction along a pump axis, the outer drive configured to rotate on the pump axis; an inner drive connected to the outer drive to be rotated by the outer drive, the inner drive extending in a second axial direction opposite the first axial direction, the inner drive including an inwardly projecting support connected to the outer drive and the inner drive including a drive link extending between the inwardly projecting support and the helical rotor rod; wherein the drive link is connected to the inwardly projecting support to rotate with the inwardly projecting support, and wherein the drive link interfaces with one of the inwardly projecting support and the helical rotor rod at a first slotted interface to allow the drive link to rock relative to the at least one of the helical rotor rod and the inwardly projecting support; wherein the inner drive is connected to the helical rotor rod to drive rotation of the helical rotor rod.

12 . The pump of claim 11 , wherein the drive link interfaces with the inwardly projecting support at the first slotted interface, and the drive link interfaces with the helical rotor rod at a second slotted interface.

13 . The pump of claim 11 , wherein:
the drive link includes a link body that extends into a first slot and a second slot of the one of the inwardly projecting support and the helical rotor rod at the first slotted interface.

14 . The pump of claim 13 , wherein the drive link includes a first tab that extends from the link body and into a first recess of the one of the inwardly projecting support and the helical rotor rod.

15 . The pump of claim 14 , wherein the inwardly projecting support includes the first slot and the second slot, and wherein the drive link body extends into a third slot and a fourth slot of the helical rotor rod to form a second slotted interface.

16 . The pump of claim 11 , wherein the drive link is at least partially disposed within the inwardly projecting support and the drive link is at least partially disposed in the helical rotor rod.

17 . A pump comprising:
a pump body; an electric motor disposed within the pump body, the electric motor including a motor rotor configured to rotate on an axis and a motor stator disposed around the motor rotor to electromagnetically drive rotation of the motor rotor; a pump stator disposed radially inward of the electric motor; a helical rotor rod disposed at least partially within the pump stator, the helical rotor rod configured to rotate relative to the pump stator to form a series of progressing cavities to pump material; an outer drive extending axially outward from the electric motor in a first axial direction along the axis, the outer drive configured to rotate on the pump axis; and an inner drive connected to the outer drive at a first interface to be rotated by the outer drive, the inner drive extending in a second axial direction opposite the first axial direction; wherein the inner drive is connected to the helical rotor rod at a second interface to drive rotation of the helical rotor rod; and wherein the second interface is spaced from the first interface in the second axial direction.

18 . The pump of claim 17 , wherein:
the motor rotor is configured to rotate on the pump axis; the motor stator is disposed around the motor rotor; and the outer drive is at least partially formed by a motor rotor body of the motor rotor.

19 . The pump of claim 17 , wherein the pump stator radially overlaps with the electric motor.

20 . A pump comprising:
a pump body; an electric motor disposed within the pump body, the electric motor including a motor rotor configured to rotate on an axis and a motor stator disposed around the motor rotor to electromagnetically drive rotation of the motor rotor; a pump channel extending through the pump body to define a flowpath for material to flow between the electric motor and between a pump inlet and a pump outlet; a pump stator disposed radially inward of the electric motor; a helical rotor rod disposed at least partially within the pump stator, the helical rotor rod configured to rotate relative to the pump stator t

Assignees

• Graco Minnesota Inc

Inventors

• Shultz Mark D
• Roden Joshua D

Classifications

• H02K21/14

  with magnets rotating within the armatures · CPC title

• F04C2240/40

  Electric motor · CPC title

• F04C2240/20

  Rotors · CPC title

• F04C2240/10

  Stators · CPC title

• F04C15/06

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title