System for dispensing abrasive material

Patent metadata

Field	Value
Publication number	US-11971022-B2
Application number	US-202217688344-A
Country	US
Kind code	B2
Filing date	Mar 7, 2022
Priority date	Mar 17, 2021
Publication date	Apr 30, 2024
Grant date	Apr 30, 2024

Abstract

A system for dispensing abrasive materials includes a transfer pump configured to pump abrasive material to a metering pump configured to pump the abrasive material to an application. Dynamic interfaces within the pumps are at least partially formed by sleeved components of the pump interfacing with a seal configured to engage with the sleeved surface during relative movement between the sleeved surface and the seal. The smooth exterior surfaces of the sleeves interface with the seals to prevent abrasive particulate in the material from adhering to the sleeve, preventing the abrasive particulate from being pulled between the sleeve and the seal.

First claim

The invention claimed is:

1. A pump for pumping an abrasive material, the pump comprising:
a pump body;
a first seal supported by the pump body;
a piston at least partially disposed within the pump body and configured to reciprocate along a pump axis;
a first piston sleeve mounted on the piston, wherein the first piston sleeve interfaces with the first seal during reciprocation of the piston;
a second piston sleeve mounted on the piston and spaced axially from the first piston sleeve along the piston; and
an intake valve disposed within the pump body, wherein the intake valve includes an intake seal assembly disposed on the piston, wherein the intake seal assembly interfaces with the second piston sleeve during reciprocation of the piston, and wherein the intake valve is actuatable between an open state with the intake seal assembly disengaged from an intake seat and a closed state with the intake seal assembly engaged with the intake seat;
wherein the piston includes a proximal rod, an intermediate rod connected to the proximal rod, a distal rod connected to the intermediate rod at an opposite end of the intermediate rod from the proximal rod, the first piston sleeve is mounted on the proximal rod, and the second piston sleeve is mounted on the distal rod; and
wherein the intermediate rod interfaces with the first piston sleeve and does not interface with the second piston sleeve.

2. The pump of claim 1 , wherein the intake seal assembly rides on the second piston sleeve.

3. The pump of claim 2 , wherein the intake seal assembly comprises:
an intake seal housing; and
an intake seal disposed within the intake seal housing, the intake seal engaging the second piston sleeve.

4. The pump of claim 3 , wherein the intake seal comprises:
a first intake dynamic seal having a first seal body and a first seal cup; and
a second intake dynamic seal having a second seal body and a second seal cup;
wherein both the first intake dynamic seal and the second intake dynamic seal engage the second piston sleeve;
wherein the first seal body abuts the second seal body; and
wherein the first seal cup is oriented in a first axial direction along the axis and the second seal cup is oriented in a second axial direction along the axis opposite the first axial direction.

5. The pump of claim 1 , wherein the intermediate rod comprises:
a rod body interfacing with the distal rod to connect the intermediate rod to the distal rod; and
a guide body disposed on the rod body, wherein the guide body interfaces with the first piston sleeve.

6. The pump of claim 1 , wherein an exterior surface of the first piston sleeve has a mean roughness depth (Rz) of up to 0.8 micrometers.

7. The pump of claim 6 , wherein the exterior surface of the first piston sleeve has an Rz of up to 0.3 micrometers.

8. The pump of claim 7 , wherein the exterior surface of the first piston sleeve has an Rz of up to 0.25 micrometers.

9. The pump of claim 1 , wherein an exterior surface of the first piston sleeve is formed from one of C3 tungsten carbide and ceramic and an exterior surface of the second piston sleeve is formed from one of C3 tungsten carbide and ceramic.

10. The pump of claim 1 , further comprising:
a cylinder sleeve mounted to the pump body; and
a piston valve disposed within the pump body, wherein the piston valve includes a piston seal assembly disposed on the piston, wherein the piston seal assembly interfaces with the cylinder sleeve during reciprocation of the piston, and wherein the piston valve is actuatable between an open state with the piston seal assembly disengaged from a piston valve seat and a closed state with the piston seal assembly engaged with the piston valve seat.

11. The pump of claim 10 , wherein the piston valve seat is formed on the piston.

12. The pump of claim 10 , wherein a piston seal is supported by the piston seal assembly and engaging the cylinder sleeve.

13. The pump of claim 12 , wherein the piston seal includes a seal face engaging the cylinder sleeve, and wherein the seal face is concave.

14. The pump of claim 10 , wherein the pump body comprises:
an inlet housing;
a valve housing mounted to the inlet housing, wherein the intake seal assembly is disposed within the valve housing;
a pump cylinder mounted to an opposite end of the valve housing from the inlet housing, wherein the cylinder sleeve is mounted on an inner surface of the pump cylinder; and
an outlet housing mounted to an opposite end of the pump cylinder from the valve housing.

15. The pump of claim 14 , further comprising:
a throat cartridge mounted to an opposite end of the outlet housing from the pump cylinder;
wherein the first seal is disposed within the throat cartridge and engages with the first piston sleeve and the first seal comprises:
a first throat dynamic seal having a first seal body and a first seal cup; and
a second throat dynamic seal having a second seal body and a second seal cup;
wherein the first seal body abuts the second seal body and the first seal cup is oriented in a first axial direction along the axis and the second seal cup is oriented in a second axial direction along the axis opposite the first axial direction.

16. A pumping system for pumping abrasive material, the pumping system comprising:
a transfer pump configured to draw material from a vessel and pump the material downstream through a first conduit, the transfer pump formed by the pump of claim 1 ; and
a metering pump connected to the first conduit to receive the material from the transfer pump, the metering pump configured to pump the material downstream through a downstream conduit to an applicator, the metering pump comprising:
a metering pump body;
a first metering seal supported by the metering pump body;
a metering cylinder sleeve supported by the metering pump body;
a metering piston at least partially disposed within the metering pump body and configured to reciprocate along a metering pump axis;
a metering piston sleeve mounted on the metering piston, wherein the metering piston sleeve interfaces with the first metering seal during reciprocation of the metering piston; and
a metering piston seal mounted on the metering piston and interfacing with the metering cylinder sleeve, wherein the metering piston seal is an only portion of the metering piston interfacing with the metering cylinder sleeve during reciprocation of the metering piston.

17. A pump for pumping an abrasive material, the pump comprising:
a pump body;
a first seal supported by the pump body;
a piston at least partially disposed within the pump body and configured to reciprocate along a pump axis;
a first piston sleeve mounted on the piston, wherein the first piston sleeve interfaces with the first seal during reciprocation of the piston;
a second piston sleeve mounted on the piston and spaced axially from the first piston sleeve along the piston; and
an intake valve disposed within the pump body, wherein the intake valve includes an intake seal assembly disposed on the piston, wherein the intake seal assembly interfaces with the second piston sleeve during reciprocation of the piston, and wherein the intake valve is actuatable between an open state with the intake seal assembly disengaged from an intake seat and a closed state with the intake seal assembly engaged with the intake seat;
wherein the piston includes a proximal rod, an intermediate rod connected to the proximal rod, a distal rod connected to the intermediate rod at an opposite end of the intermediate rod from the proximal rod, the first pi

Assignees

• Graco Minnesota Inc

Inventors

• Sinders Steven R
• Scopelite John R

Classifications

• B05C5/0225

  characterised by flow controlling means, e.g. valves, located proximate the outlet (B05C5/0258, B05C5/0275 take precedence; supply valves upstream the coating head B05C11/1036) · CPC title

• B05C11/1026

  Valves (in general F16K; B05C5/0225 takes precedence) · CPC title

• B05C11/1036

  Means for supplying a selected one of a plurality of liquids or other fluent materials, or several in selected proportions, to the applying apparatus · CPC title

• F04B15/02 Primary

  the fluids being viscous or non-homogeneous · CPC title

• F04B13/00

  Pumps specially modified to deliver fixed or variable measured quantities · CPC title