Displacement pump

Patent metadata

Field	Value
Publication number	US-10174754-B2
Application number	US-201514874144-A
Country	US
Kind code	B2
Filing date	Oct 2, 2015
Priority date	Oct 3, 2014
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A valve assembly with a valve member coaxially received within a valve casing and interacts with the casing to provide a one-way inlet valve at one end of the valve casing and a one-way outlet valve at the other end of the casing with an annular compartment therebetween adapted to be coupled to a variable volume compartment and thereby together provide a simplified construction for valving components of a fluid pump.

First claim

We claim:

1. A pump comprising:
a variable volume compartment defined between a chamber-forming body and a movable member movable relative to the chamber-forming body wherein movement of the movable member changes a volume of the variable volume compartment between a first volume and a second volume different than the first volume,
a tubular valve casing elongate along a casing axis, defining a valve chamber therein,
the valve chamber having an inner wall circular in cross-section along the axis, an open inlet end and an outlet end,
the inlet end to be placed into communication with an interior of an enclosed non-collapsible reservoir containing a fluid to be dispensed,
a valve member coaxially located within the valve chamber,
the valve member comprising a stem extending axially within the valve chamber,
an inlet disc extending radially outwardly from the stem to a distal end in engagement with the inner wall, the inlet disc engaging the inner wall to prevent fluid flow axially therepast in a direction from the outlet end towards the inlet end, the inlet disc being resiliently deflectable to be deflected from engaging the inner wall to permit fluid flow axially therepast in a direction from the inlet end towards the outlet end,
an outlet disc extending radially outwardly from the stem to a distal end in engagement with the inner wall, the outlet disc engaging the inner wall to prevent fluid flow axially therepast in a direction from the outlet end towards the inlet end, the outlet disc being resiliently deflectable to be deflected from engaging the inner wall to permit fluid flow axially therepast in a direction from the inlet end towards the outlet end,
the inlet disc on the stem spaced axially away from the outlet end from the outlet disc,
the outlet disc on the stem spaced axially away from the inlet end from the inlet disc,
an outlet from the valve chamber spaced axially away from the inlet end from the outlet disc, the outlet in communication with a liquid discharge outlet,
a fluid transfer port in communication with the variable volume compartment and open through the inner wall into the valve chamber in between the inlet disc and the outlet disc,
an air seal disc extending radially outwardly from the stem to a distal end in engagement with the inner wall, the air seal disc engaging the inner wall to prevent fluid flow axially therepast in a direction from the inlet end towards the outlet end,
the air seal disc spaced axially away from the outlet end from the inlet disc,
an air vent disc extending radially outwardly from the stem to a distal end in engagement with the inner wall, the air vent disc engaging the inner wall to prevent fluid flow axially therepast in a direction from the inlet end towards the outlet end, the air vent disc being resiliently deflectable to be deflected from engaging the inner wall to permit fluid flow axially therepast in a direction from the outlet end towards the inlet end,
the air vent disc spaced axially away from the outlet end from the air seal disc,
an air vent port through the inner wall opening the valve chamber to the atmosphere,
the air vent port on the stem axially between the air seal disc and the air vent disc,
the stem having a tubular stem wall,
the stem wall defining radially within the stem wall a discharge passage closed at an inner end and open at an outer end in communication with the outlet,
the stem wall defining radially within the stem wall a feed passage open at an inner end in communication with the inlet end and closed at an outer end,
a liquid inlet port through the stem wall into the feed passage in between the air seal disc and the inlet disc.

2. A pump as claimed in claim 1 wherein the valve member is fixed to the chamber-forming body against relative movement.

3. A pump as claimed in claim 1 wherein the valve casing and the chamber-forming body are injection molded as a unitary element.

4. A pump as claimed in claim 1 wherein:
when a vacuum condition exists at the inlet end sufficient to act on the air vent disc to deflect the air vent disc from engaging the inner wall, air from the atmosphere is drawn inwardly past the air vent disc to reduce the vacuum condition with the air from the atmosphere passing via the air vent port into the valve chamber between the air seal disc and the air vent disc annularly about the stem and past the air vent disc to the inlet end.

5. A pump as claimed in claim 1 wherein the valve casing is open at the outlet end to provide the outlet,
the valve stem carrying a sealing disc which engages the valve casing outwardly of the outlet disc to close the outlet end of valve chamber,
a liquid discharge port through the stem wall into the discharge passage in between the outlet disc and the sealing disc.

6. A pump as claimed in claim 5 wherein:
the sealing disc extending radially outwardly from the stem to a distal end in engagement with the inner wall, the sealing disc engaging the inner wall to prevent fluid flow axially therepast in a direction from the inlet end towards the outlet end.

7. A pump as claimed in claim 5 wherein the sealing disc engages the valve casing to secure the valve casing in valve chamber against removal.

8. A pump as claimed in claim 5 wherein:
movement of the movable member to increase the volume of the variable volume compartment draws the fluid from the interior of the reservoir into the variable volume compartment through the valve chamber via the inner end of the feed passage, the feed passage and the liquid inlet port to between the air seal disc and the inlet disc and then via the fluid transfer port to the variable volume compartment creating a vacuum within the valve chamber between the inlet disc and the outlet disc which vacuum acts on the inlet disc to deflect the inlet disc from engaging the inner wall permitting the fluid to be drawn inwardly from the inlet past the inlet disc,
movement of the movable member to decrease the volume of the variable volume compartment discharges the fluid from the variable volume compartment through the valve chamber to the discharge outlet via the fluid transfer port to between the inlet disc and the outlet disc and then past the outlet disc to between the outlet disc and the sealing disc and via the liquid discharge port into the discharge passage to the outlet creating pressure within the valve chamber between the inlet disc and the outlet disc which pressure acts on the outlet disc to deflect the outlet disc from engaging the inner wall permitting the fluid to be discharged outwardly past the outlet disc to the outlet.

9. A pump as claimed in claim 5 wherein:
when a vacuum condition exists at the inlet end sufficient to act on the air vent disc to deflect the air vent disc from engaging the inner wall, air from the atmosphere is drawn inwardly past the air vent disc to reduce the vacuum condition with the air from the atmosphere passing via the air vent port into the valve chamber between the air seal disc and the air vent disc annularly about the stem and past the air vent disc to the inlet end.

10. A pump as claimed in claim 1 wherein:
movement of the movable member to increase the volume of the variable volume compartment draws the fluid from the interior of the reservoir into the variable volume compartment through the valve chamber via the inner end of the feed passage, the feed passage and the liquid inlet port to between the air seal disc and the inlet disc, past the inlet disc and then via the fluid transfer port to the variable volume compartment creating a vacuum within the valve chamber between the inlet disc and the outlet disc which vacuum acts on the inlet disc to deflect the inlet disc from engaging

Assignees

• Op Hygiene Ip Gmbh

Inventors

• Ophardt Heiner
• Jones Andrew
• Shi Zhenchun (Tony)

Classifications

• B05B11/1035

  the pumping chamber being a bellow · CPC title

• B05B11/1069

  the valve being made of a resiliently deformable material or being urged in a closed position by a spring · CPC title

• B05B11/1064

  Pump inlet and outlet valve elements integrally formed of a deformable material (pump chambers having a deformable wall integrally formed with inlet and outlet valve elements B05B11/1033) · CPC title

• B05B11/103

  without substantial movement of the nozzle in the direction of the pressure stroke · CPC title

• F04B53/1092

  and one single element forming both the inlet and outlet closure member · CPC title