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1. (WO1979000197) POMPES A DIAPHRAGME
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS
1. A positive displacement diaphragm pump having an air chamber, a pumping chamber for fluid to be pumped, and a composite diaphragm between the air chamber and the pumping chamber, characterised in that the composite diaphragm comprises a first membrane communicating with the air chamber, a second membrane of smaller area than the first communicating with the pumping chamber, and a further air chamber between, and defined by, the first and second membranes, and means is provided for
alternately supplying compressed air to the air chamber to effect a pumping stroke of the composite diaphragm and exhausting the air chamber while supplying compressed air to the further air chamber to effect a return stroke of the composite diaphragm.

2. A pump according to claim 1 wherein the first and second membranes of the composite diaphragm are linked at their mid-points by a connecting member so as to be capable of movement only in unison.

3. A pump according to claim 2, wherein each of the first and second membranes is provided with a centre plate, and the connecting member serves as a backing plate for each of the centre plates so that each of the first and second membranes is secured between its centre plate and the connecting member.

4. A. pump according to claim 1 wherein the first and second membranes are joined over the whole of their facing surfaces by a non-cellular porous spongy material that is air-permeable and bonds the membranes to one another to move only in unison.

5. A pump according to claim 1, wherein the first membrane is a rubberized asbestos or rubberized canvas diaphragm.

6. A pump according to claim 1 or claim 5, wherein the second membrane is a diaphragm made from a Viton (Trade Mark), neoprene, polyurethane, butyl or nitrile rubber.

7. A pump according to claim 1, wherein the means for controlling the air supply to the air chamber and to the further air chamber is a spool or shuttle valve.

8. A pump according to claim 7, wherein the valve is controlled by a probe extending into the air chamber and responsive to the position of the composite diaphragm.

9. A pump according to claim 7, wherein the valve is controlled by air logic, utilizing small changes in the air pressure at a pilot pressure port to determine when the composite diaphragm is at the ends of its stroke.

10. A pump according to claim 7, wherein the valve is controlled according to a time sequence.

11. A pump according to claim 7, wherein the valve is controlled in response to an operator's actions.

12. A pump according to claim 1 or claim 7, wherein the means for controlling the air supply to the air chamber is effective to maintain a constant supply of compressed air to the further air chamber while alternately supplying compressed air to and exhausting the air chamber.

13. A double-acting pump assembly comprising a pair of pumps according to claim 1, wherein the means for
alternately supplying compressed air to the air chambers and exhausting the air chambers while supplying compressed air to the further air chambers comprises a single air valve effective to cause the two composite diaphragms to produce their pumping strokes alternately.
14. A positive displacement diaphragm pump comprising: a housing;
a composite diaphragm across the housing, the composite diaphragm comprising a first membrane and a second membrane;
a pumping chamber for fluid to be pumped, defined between the housing and the second membrane of the
composite diaphragm;
an air chamber within the housing defined by the first membrane and the housing;

a further air chamber between, and defined by, the first and second membranes, the second membrane being of smaller area than the first; and
valve means for supplying compressed air to the air chamber to effect a pumping stroke of the composite diaphragm, and for exhausting the air chamber while supplying compressed air to the further air chamber to effect a return stroke of the composite diaphragm.
15. A positive displacement diaphragm pump comprising; a housing;
first and second diaphragms within the housing and defining, with the housing, a first air chamber, a second air chamber, and a pumping chamber for fluid to be pumped; the first diaphragm presenting, to the second air chamber, a larger effective area than the second diaphragm ;
means connecting the first and second diaphragms to move only in unison;
a compressed air source;
air valve means having first and second modes of actuation, of which the first mode is effective to connect the compressed air source to the first air chamber to urge the first and second diaphragms for movement in unison to a limiting position in which the volume of the pumping chamber is reduced, and the second mode is effective to exhaust the first air chamber and connect the source of compressed air to the second air chamber to urge the first and second diaphragms in unison in the opposite direction to a limiting position in which the volume of the pumping chamber is at a maximum; and
means for controlling the actuation of the air valve means alternately between the first and second modes.

16. A positive displacement diaphragm pump comprising:
first and second housing shells defining a housing;
a composite diaphragm sandwiched between the housing shells and dividing the housing into a working chamber and a pumping chamber;
an air inlet into the working chamber for alternately pressurizing and exhausting the working chamber;
a fluid inlet into the pressure chamber for admitting fluid to be pumped;
a one-way valve in the fluid inlet;
a fluid outlet from the pressure Chamber for delivering pumped fluid therefrom;
a one-way valve in the fluid outlet;.
the composite diaphragm comprising a pair of membrane connected together to move only in unison and defining an air chamber therebetween, the working areas of the membranes, being such that a higher pressure in the air chamber than in the working chamber urges the composite diaphragm to move in a direction to reduce the volume of the working chamber; and
an air inlet into the air chamber for pressurizing the air chamber.

17 . A double-acting positive displacement diaphragm pump comprising:
a first housing means;
first and second diaphragms within the first housing means defining a first working fluid chamber between
the first diaphragm and the first housing means a second wording fluid chamber between the first and second
diaphragms and a first pumping chamber between the second diaphragm and the first housing means;
means interconnecting the first and second diaphragms and permitting them to move only in unison;
a second housing means;
third and fourth diaphragms within the second housing means defining a third working fluid chamber between
the third diaphragm and the second housing means, a fourth working fluid chamber between the third and fourth diaphragms and a second pumping chamber between the fourth diaphragm and the second housing means;
means interconnecting the third and fourth diaphragms and permitting them to move only in unison;
a fluid, pressure source;
valve means for alternately connecting the first
and third working fluid chambers to the fluid pressure
source and for exhausting each of the first and third
working fluid chambers when the other is so connected;
a first input conduit to the first pumping chamber;
a first output conduit from the the first pumping chamber a second input conduit to the second pumping chamber;
a second output conduit from the second pumping chamber; and
one-way valve means in the input and output
conduits for permitting fluid to flow into the pumpingchambers only through the input conduits and from the pumping chambers only through the output conduits. 18 . A pump according to claim 17 , wherein the. first diaphragm is of greater area than the second and the third diaphragm is of greater area than the fourth.
19: A pump according to claim 18 further comprising means connecting each of the second, and fourth working fluid chambers to the fluid pressure source,
20. A pump according to any of claims 17 to 19 , wherein the first and second outlet conduits lead to a common delivery conduit for pumped fluid.

AMENDED CLAIMS
(received by the International Bureau on 28 February 1979 (28.02.79))
1. A positive displacement diaphragm pump having an air chamber, a pumping chamber for fluid to be pumped, and a composite diaphragm between the air chamber and the pumping chamber, characterised in that the composite diaphragm comprises a first cupped membrane of a rubber or rubber-containing material communicating with the air chamber, a second cupped membrane of a rubber or rubber-containing material of smaller area than the first communicating with the pumping chamber, and a further air chamber between, and defined by, the first and second membranes, and means is provided for alternately supplying compressed air to the air chamber to effect a pumping stroke of the composite diaphragm and exhausting the air chamber while supplying compressed air to the further air chamber to effect a return stroke of the composite diaphragm.

2. A pump according to claim 1 wherein the first and second membranes of the composite diaphragm are linked at their mid-points by a connecting member so as to be capable of movement only in unison.

3. A pump according to claim 2 , wherein each of the first and second membranes is provided with a centre plate, and the connecting member serves as a backing plate for each of the centre plates so that each of the first and second membranes is secured between its centre plate and the connecting member.

4. A pump according to claim 1 wherein the first and

11. A pump according to claim 7, wherein the valve is controlled in response to an operator's actions.

12. A pump according to claim 1 or claim 7, wherein the means for controlling the air supply to the air chamber is effective to maintain a constant supply of compress air to the further air chamber while alternately
supplying compressed air to and exhausting the air chamber.

13. A double-acting pump assembly comprising a pair of pumps according to claim 1, wherein the means for alternately supplying compressed air to the air chambers and exhausting the air chambers while supplying
compressed air to the further air chambers comprises a single air valve effective to cause the two composite diaphragms to produce their pumping strokes alternately.

14. A positive displacement diaphragm pump comprising: a housing;
a composite diaphragm across the housing, the composite diaphragm comprising a first cupped membrane and a second cupped membrane both made of rubber or a rubber-containing material;
a pumping chamber for fluid to be pumped, defined between the housing and the second membrane of the composite diaphragm;
an air chamber within the housing defined by the first membrane and the housing;
a further air chamber between, and defined by, the first and second membranes, the second membrane being of smaller area than the first; and
valve means for supplying compressed air to the air chamber to effect a pumping stroke of the composite
diaphragm, and for exhausting the air chamber while
supplying compressed air to the further air chamber toeffect a return stroke of the composite diaphragm.

15. A positive displacement diaphragm pump comprising:
a housing;
first and second cupped diaphragms within the
housing each made of rubber or a rubber-containing
material and defining, with the housing, a first air chamber, a second air chamber, and a pumping chamber for fluid to be pumped;
the first diaphragm presenting, to the second air chamber, a larger effective area than the second diaphragm; means connecting the first and second diaphragms to move only in unison;
a compressed air source;
air valve means having first and second modes of actuation, of which the first mode is effective to
connect the compressed air source to the first air chamber to urge the first and second, diaphragms for movement in unison to a limiting position in which the volume of the pumping chamber is reduced, and the second mode is
effective to exhaust the first air chamber and connect the source of compressed air to the second air chamber to urge the first and second diaphragms in unison in the opposite direction to a limiting position in which the volume of the pumping chamber is at a maximum; and
means for controlling the actuation of the air valve means alternately between the first and second modes.

16. A positive displacement diaphragm pump comprising:
first and second housing shells defining a housing;
a composite diaphragm sandwiched between the housing shells and dividing the housing into a working chamber and a pumping chamber;
an air inlet into the working chamber for alternately pressurizing and exhausting the working chamber;
a fluid inlet into the pressure chamber for admitting fluid to be pumped;
a one-way valve in the fluid inlet;
a fluid outlet from the pressure chamber for
delivering pumped fluid therefrom;
a one-way valve in the fluid outlet;
the composite diaphragm comprising a pair of cupped membranes each made of rubber or a rubber-containing material connected together to move only in unison and defining an air chamber therebetween, the working areas of the membranes being such that a higher pressure in the air chamber than in the working chamber urges the composite diaphragm to move in a direction to reduce the volume of the working chamber; and
an air inlet into the air chamber for pressurizing the air chamber.

comprising;
a first housing means;
first and second cupped diaphragms within the first
housing means, each made of rubber or a rubber-containing material and defining a first working fluid chamber between the first diaphragm and the first housing means, a second working fluid chamber between the first and second diaphragms and a first pumping chamber between the second diaphragm and the first housing means;
means interconnecting the first and second diaphragms and permitting them to move only in unison;
a second housing means;
third and fourth diaphragms within the second housing means defining a third working fluid chamber between the third diaphragm and the second housing means, a fourth working fluid chamber between the third and fourth diaphragms and a second pumping chamber between the fourth diaphragm and the second housing means;
means interconnecting the third and fourth diaphragms and permitting them to move only in unison;
a fluid pressure source;
valve means for alternately connecting the first and third working fluid chambers to the fluid pressure source and for exhausting each of the first and third working fluid
chambers when the other is so connected;
a first input conduit to the first pumping chamber;
a first output conduit from the first pumping chamber;
a second input conduit to the second pumping chamber;
a second output conduit from the second pumping chamber; and