Electrically operated pump for a plural component spray system

Patent metadata

Field	Value
Publication number	US-12366233-B2
Application number	US-202117914657-A
Country	US
Kind code	B2
Filing date	Mar 31, 2021
Priority date	Mar 31, 2020
Publication date	Jul 22, 2025
Grant date	Jul 22, 2025

Abstract

An electrically operated pumping assembly for a plural component spray system includes an electric motor ( 14 ) having a stator ( 88 ) and a rotor ( 90 ). The rotor is disposed coaxially with first and second pumps ( 26 a, 26 b ) and is configured to cause pumping by each of the first and second pumps. The first and second pumps are configured to pump different component materials to an applicator ( 34 ) for forming a plural component spray material. A drive mechanism ( 86 ) is disposed between and connected to each of the rotor and the fluid displacement members ( 70 a, 70 b ) of the first and second pumps. The drive mechanism receives a rotational output from the rotor and provides a linear input to the first and second pumps to cause pumping.

First claim

The invention claimed is:

1. A pumping system for a plural component spray system configured to receive first and second component materials and output a plural component material, the pumping system comprising:
an electric motor including a stator and a rotor, the rotor configured to rotate about a pump axis;
a first motor bearing supporting the rotor and a second motor bearing supporting the rotor, the first motor bearing disposed at least partially axially outward of the rotor and the second motor bearing disposed at least partially axially outward of the rotor;
a drive directly connected to the rotor and configured to convert a rotational output from the rotor to a linear input, the drive comprising a screw disposed coaxially with the rotor and configured to provide the linear input, wherein the screw extends through and is disposed directly radially inward of the first motor bearing and the second motor bearing, wherein an inner race of the first motor bearing is mounted on a drive nut of the drive, the drive nut disposed directly radially between the screw and the stator, and wherein an inner race of the second motor bearing is mounted on the drive nut;
a first piston of a first pump coupled to the drive to be reciprocated axially by the drive; and
a second piston of a second pump coupled to the drive to be reciprocated axially by the drive.

2. The pumping system of claim 1 , wherein the drive further comprises:
a plurality of rolling elements disposed between the screw and the rotor, wherein the plurality of rolling elements support the screw relative the rotor and are configured to drive the screw axially.

3. The pumping system of claim 2 , wherein the plurality of rolling elements include one of balls and rollers.

4. The pumping system of claim 2 , wherein the plurality of rolling elements are disposed between the drive nut and the screw.

5. The pumping system of claim 1 , wherein:
the first pump includes a first housing at least partially defining a first pump chamber, a first inlet valve, and a first outlet valve; and
the first piston divides the first pump chamber into an upstream chamber and a downstream chamber.

6. The pumping system of claim 5 , wherein each of the first inlet valve and the first outlet valve are fixed relative the pump axis.

7. The pumping system of claim 1 , wherein the first pump includes a first inlet valve and a first outlet valve, wherein at least one of the first inlet valve and the first outlet valve is oriented transverse to the pump axis.

8. The pumping system of claim 1 , wherein the first pump is disposed on a first axial side of the electric motor and the second pump is disposed on a second axial side of the electric motor opposite the first axial side.

9. The pumping system of claim 1 , wherein:
the first pump is a double displacement pump such that the first pump is configured to output fluid during each of a first stroke and a second stoke of a pump cycle of the first pump; and
the second pump is a double displacement pump.

10. The pumping system of claim 1 , further comprising:
a controller operatively connected to the electric motor, wherein the controller is configured to:
regulate power provided to the electric motor such that the rotor turns the drive at an operating speed capable of generating a downstream flow rate up to a target flow rate.

11. The pumping system of claim 1 , further comprising:
a controller operatively connected to the electric motor, wherein the controller is configured to:
regulate power provided to the electric motor such that the rotor applies torque to the drive with the pump in a stalled state during which a downstream pressure meets or exceeds an operating pressure.

12. A plural component spray system comprising:
the pumping system of claim 1 ;
an applicator disposed downstream of the first pump and the second pump, the applicator configured to receive the first component material from the first pump and the second component material from the second pump and to output the plural component material formed from the first component material and the second component material;
a first feed pump disposed upstream of and fluidly connected to the first pump to provide the first component material to the first pump at a first feed pressure; and
a second feed pump disposed upstream of and fluidly connected to the second pump to provide the second component material to the second pump at a second feed pressure.

13. A pumping assembly for a plural component spray system configured to receive first and second component materials and output a plural component material, the pumping assembly comprising:
a motor including a stator and a rotor, the rotor configured to rotate on a motor axis;
a drive directly connected to the rotor and configured to convert a rotational output from the rotor to a linear input, the drive comprising a screw disposed coaxially with the rotor and configured to provide the linear input;
a first piston of a first pump coupled to the drive to be reciprocated axially, wherein the first piston is configured to draw fluid into an upstream fluid chamber of the first pump through a first check valve during a fill stroke in which the first piston displaces in a first direction along the axis, and the first piston is configured to displace the fluid out of the upstream fluid chamber through a second check valve during a pressure stroke in a second direction along the axis, the first piston extending into a first axial end of the screw and connected to the screw by a first pin; and
a second piston of a second pump coupled to the drive to be reciprocated axially by the drive, the second piston connected to a second axial end of the screw opposite the first axial end by a second pin;
a first pump support connecting the first pump to the motor and having an anti-rotation element, wherein the first pin interfaces with the first pump support to prevent rotation of the first piston on the motor axis.

Assignees

• Graco Minnesota Inc

Inventors

• Theisen Matthew R
• Graf Arthur T
• Colby Bryan K
• Ericson Andrew J
• Studt Nicholas K
• Beckmann Erich W

Classifications

• H02K7/06

  Means for converting reciprocating motion into rotary motion or vice versa · CPC title

• F04B5/02

  with double-acting pistons · CPC title

• F04B53/14

  Pistons, piston-rods or piston-rod connections · CPC title

• F04B17/03

  driven by electric motors · CPC title

• F04B23/02

  having reservoirs · CPC title