EP0801228B1 - Double diaphragm pump - Google Patents
Double diaphragm pump Download PDFInfo
- Publication number
- EP0801228B1 EP0801228B1 EP97302476A EP97302476A EP0801228B1 EP 0801228 B1 EP0801228 B1 EP 0801228B1 EP 97302476 A EP97302476 A EP 97302476A EP 97302476 A EP97302476 A EP 97302476A EP 0801228 B1 EP0801228 B1 EP 0801228B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- air
- ports
- carriage
- pilot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
- F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
- F04B45/041—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms double acting plate-like flexible pumping member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0055—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes
- F04B39/0061—Pulsation and noise damping means with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes using muffler volumes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/06—Pumps having fluid drive
- F04B43/073—Pumps having fluid drive the actuating fluid being controlled by at least one valve
- F04B43/0736—Pumps having fluid drive the actuating fluid being controlled by at least one valve with two or more pumping chambers in parallel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/22—Arrangements for enabling ready assembly or disassembly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
- F04B9/129—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers
- F04B9/131—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members
- F04B9/135—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by two single-acting elastic-fluid motors, each acting in one direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2210/00—Working fluid
- F05B2210/10—Kind or type
- F05B2210/12—Kind or type gaseous, i.e. compressible
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S417/00—Pumps
Definitions
- Air operated double diaphragm pumps have been a popular product for many years and are widely used for the transfer of fluids and other uses. Such pumps are manufactured by a variety of producers using a number of different designs.
- One such pump is disclosed in European Patent Publication No 0609044A entitled “An Air Valving Mechanism, in Combination with a Double Diaphragm Pump Subassembly”.
- the document describes a double diaphragm pump subassembly including a pair of diaphragm mounting plates. An air valve mechanism is confined within the plates.
- Another pump is disclosed in US Patent No. 4597403 entitled "Nutation Valving Apparatus and Method of Operation”.
- the document describes timed valving in which a nutating plate having an opening moves relative to at least one other nominally static plate having a complementary opening.
- the nutating plate moves between a position where the nutating plate opening and the static plate opening are aligned and a position where the nutating plate opening and the static plate opening are not aligned and the static plate opening is sealed. While a variety of such designs have proven successful in the marketplace, it is always desirable to be able to reduce the manufacturing cost of such products and in general that often means reducing the parts count involved in such a product.
- the design of the instant invention utilises a number of features which serve to achieve this end and which make the product more user friendly and adaptable for the end-user.
- the invention provides a reciprocating air operated pump having pumping elements which reciprocate along a first axis characterised by including, an air valve comprising:
- an air valve which moves in a rectangular path is provided which greatly reduces the parts count for a diaphragm pump air valve.
- a valve carriage carries a valve cup and has pistons at either end which are driven by pilot air off of two of the five ports located underneath the valve cup.
- the area over the valve plate and valve cup is pressurised with air effectively forming a sixth port and thus ports which are not covered by the valve cup are pressurised by high pressure plant air.
- the valve cup is moved in a first direction by the valve carriage and in the second direction normal to the first direction by pins which are driven by the main diaphragm assembly.
- the instant invention generally designated 10 is shown in Figure 1 in perspective and is comprised of a molded center section 12, two fluid end sections 14 and a valve cover 16.
- center section 12 is molded of polyester resin (PBT) Valox 357 - GE Plastic.
- Cover 16 is fixed via conventional fasteners 18 to center section 12. Also affixed via fasteners 18 to center section 12 are fluid housings 14. The main portion of the pump comprised of center section 12 and fluid housing 14 is affixed to manifold base 20 also via fasteners 18. Manifold base 20 has fluid inlet and outlet passages 22 and 24 respectively located at each end to allow variety in plumbing arrangements.
- check valves 26 are each comprised of a central sealing area 26A having in the preferred embodiment four radially and axially _ This removal also allows direct access and replacement of the check valves without the need to further disassemble the pump.
- this invention provides an air operated diaphragm pump characterised by having a center section containing an air valve and first and second air chambers, the improvement comprising externally accessible ports in said center section for attachment to externally operated solenoid air valves to control operation.
- the instant invention generally designated 10 is shown in Figure 1 in perspective and is comprised of a molded center section 12, two fluid end sections 14 and a valve cover 16.
- center section 12 is molded of polyester resin (PBT) Valox 357 - GE Plastic.
- Cover 16 is fixed via conventional fasteners 18 to center section 12. Also affixed via fasteners 18 to center section 12 are fluid housings 14. The main portion of the pump comprised of center section 12 and fluid housing 14 is affixed to manifold base 20 also via fasteners 18. Manifold base 20 has fluid inlet and outlet passages 22 and 24 respectively located at each end to allow variety in plumbing arrangements.
- check valves 26 are each comprised of a central sealing area 26A having in the preferred embodiment four radially and axially extending arms 26B extending therefrom and having a surface 26C which closely positions check valve 26 in check valve passages 28.
- Spring loaded fingers 26D extend from either side of arm 26B and act against the bottom or top of passage 28 to bias check valve 26 into the closed position where it will remain unless fluid pressure against sealing area 26A should press it open.
- the radially extending guide members 26B also act as a stop. The spring fingers 26D compress and the top of the guide arms 26C butts up against the fluid cover 14 on the inlet check and the manifold base 20 on the outlet check. This limits the check valve travel,
- cover 16 has an air inlet 32 which pressurises the area underneath cover 18.
- First and second auxiliary ports 54 and 56 respectively are located in the side of center housing 14 for direct, connection of air from solenoid valves if it is desired to have the pump controlled remotely rather than through the integral air valve.
- the integral ports 54 and 56 make it easy to change a pump from air valve operated to a remotely operated pump by removing the air valve cup and replacing it with an air valve plug.
- valve assembly 34 is comprised of a valve carriage 36 which has generally cylindrical end portions 36A having seals 36B thereon, a rectangular central aperture 36C which retains moveable valve block 38.
- Valve block 38 has a lower sealing section 38A and a central section 38B within aperture 36C of carriage 36 which thereby allows valve block 38 to move normal to the plane of Figure 2. This movement occurs due to pushing on block 38 by means of pins 40 which are actuated by diaphragm mounting block 41 in the center of diaphragm 42.
- valve block 38 is formed of 90 Durometer XNBR (Carboxylated Nitrile) with 10% TFE powder to reduce friction.
- air passages M1 and M2 connect to the main air chambers on the inner side of diaphragm assemblies 42 for pressurising the air chambers with compressed air as will be more fully described in the operation of the air valve hereinafter.
- Passages P1 and P2 connect to air chambers 44 and 46 respectively, passages P1 and P2 running as shown in the drawings as straight passages and thence are covered and connected to chambers 44 and 46 by cover 16.
- Valve block 38 is retained in place in valve carriage 36 by boss 16A on cover 16. To disassemble the valve assembly, one merely need remove fasteners 18 from cover 16 and lift cover 16 off whereupon valve block 38 is lifted upwardly thereby allowing valve carriage 36 to be slid out of center housing 16.
- FIGS 5 to 8 show views of the valve port surface 48 which has five ports therein.
- Central exhaust port E is connected to the exhaust passage 50 while pilot ports P1 and P2 are connected to first and second ends respectively of the pilot valve carriage 36.
- main ports M1 and M2 are connected to first and second diaphragm air chambers respectively.
- the space 52 above the ports referred to is generally filled with compressed air and ports which are not covered by the valve block 38 are pressurised with the compressed air.
- the diaphragms are moving together to the right while the pilot value carriage 36 is in the down position.
- the valve block 38 is moved into the lower right hand position of Figure 8 whereupon compressed air is fed to ports P2 and M2 while ports P1 and M1 are exhausted. This pressurises the lower end of the pilot valve carriage 36 and the pilot valve carriage 36 and the valve block 38 move upwardly to the point where the description started above.
- valve cover 16 which also covers the top of the valve cavity at the same time.
- the inlet threads on the manifold base are such that it allows use of either all American pipe thread (NPT) or British standard pipe thread (BSP).
- NPT American pipe thread
- BSP British standard pipe thread
- This hybrid thread may be formed in plastic parts and is intended to form a pressure tight joint with either plastic or brass male pipe threaded fitting of either type thread.
- the thread is defined as follows: Major diameter 13.16 mm (0.518" ) Pitch 12.30 mm (0.4843") Minor Diameter 11.45 mm (0.4506" ) Angle 1 degree 47 minutes Threads per inch 7.32 (18.6 threads per cm) Effective thread 10.21 mm (0.402"
- the muffler 54 is best seen in Figure 9.
- Exhaust port E leads to cylindrical passage 56 which is divided into first and second portions 56A and 56B by divider 56C.
- the passage is completed by a muffler area 58 in manifold base 20.
- exhaust flows out port E, into first portion 56A and into muffler area 58 whereupon it flows upwardly through second portion 56B and out through muffler outlet 60.
- This arrangement allows substantial muffling at low cost and with little penalty to performance.
Description
- Air operated double diaphragm pumps have been a popular product for many years and are widely used for the transfer of fluids and other uses. Such pumps are manufactured by a variety of producers using a number of different designs. One such pump is disclosed in European Patent Publication No 0609044A entitled "An Air Valving Mechanism, in Combination with a Double Diaphragm Pump Subassembly". The document describes a double diaphragm pump subassembly including a pair of diaphragm mounting plates. An air valve mechanism is confined within the plates. Another pump is disclosed in US Patent No. 4597403 entitled "Nutation Valving Apparatus and Method of Operation". The document describes timed valving in which a nutating plate having an opening moves relative to at least one other nominally static plate having a complementary opening. The nutating plate moves between a position where the nutating plate opening and the static plate opening are aligned and a position where the nutating plate opening and the static plate opening are not aligned and the static plate opening is sealed. While a variety of such designs have proven successful in the marketplace, it is always desirable to be able to reduce the manufacturing cost of such products and in general that often means reducing the parts count involved in such a product.
- It is therefore an object of this invention to produce an air operated double diaphragm pump which utilises a substantially lesser number of parts than prior art designs and yet which is easily manufactured, easily assembled, and reliable in operation for the consumer.
- Towards this end, the design of the instant invention utilises a number of features which serve to achieve this end and which make the product more user friendly and adaptable for the end-user.
- The invention provides a reciprocating air operated pump having pumping elements which reciprocate along a first axis characterised by including, an air valve comprising:
- a valve carriage moveable along a second axis normal to said first axis;
- a valve block moveable in said valve carriage along said first axis;
- a valve surface comprising first and second main ports; first and second pilot ports and an exhaust port;
- means for causing said valve block to move as said pumping elements move; and
- means for supplying compressed air over said valve surface and wherein said valve block moves in a generally planar rectangular path between four positions, wherein in each of said positions, said valve block connects a main port, a pilot port and said exhaust port.
-
- Thus, an air valve which moves in a rectangular path is provided which greatly reduces the parts count for a diaphragm pump air valve. A valve carriage carries a valve cup and has pistons at either end which are driven by pilot air off of two of the five ports located underneath the valve cup. The area over the valve plate and valve cup is pressurised with air effectively forming a sixth port and thus ports which are not covered by the valve cup are pressurised by high pressure plant air. Thus, the valve cup is moved in a first direction by the valve carriage and in the second direction normal to the first direction by pins which are driven by the main diaphragm assembly.
- These and other objects and advantages of the invention will appear more fully from the following description of an embodiment of the invention made by way of example only in conjunction with the accompanying drawings wherein like reference characters refer to the same or similar parts throughout the several views.
- Figure 1 is a perspective view of the instant invention,
- Figure 2 is a sectional view taken along line 2-2 of Figure 1.
- Figure 3 is a partially exploded view of the manifold base and check valves.
- Figure 4 is a plan view of the center section and diaphragms.
- Figures 5 to 8 show the air valve in its sequence of operation.
- Figure 9 is a sectional view taken along line 9-9 of Figure 1.
- Figure 10 is a perspective view showing the valve carriage and valve block.
-
- The instant invention generally designated 10 is shown in Figure 1 in perspective and is comprised of a molded
center section 12, twofluid end sections 14 and avalve cover 16. In the preferred embodiment,center section 12 is molded of polyester resin (PBT) Valox 357 - GE Plastic. -
Cover 16 is fixed viaconventional fasteners 18 tocenter section 12. Also affixed viafasteners 18 tocenter section 12 arefluid housings 14. The main portion of the pump comprised ofcenter section 12 andfluid housing 14 is affixed tomanifold base 20 also viafasteners 18. Manifoldbase 20 has fluid inlet andoutlet passages 22 and 24 respectively located at each end to allow variety in plumbing arrangements. - Turning more specifically to Figure 3,
check valves 26 are each comprised of a central sealing area 26A having in the preferred embodiment four radially and axially _ This removal also allows direct access and replacement of the check valves without the need to further disassemble the pump. - In a fifth aspect, this invention provides an air operated diaphragm pump characterised by having a center section containing an air valve and first and second air chambers, the improvement comprising externally accessible ports in said center section for attachment to externally operated solenoid air valves to control operation.
- These and other objects and advantages of the invention will appear more fully from the following description of an embodiment of the invention made by way of example only in conjunction with the accompanying drawings wherein like reference characters refer to the same or similar parts throughout the several views.
- Figure 1 is a perspective view of the instant invention,
- Figure 2 is a sectional view taken along line 2-2 of Figure 1.
- Figure 3 is a partially exploded view of the manifold base and check valves.
- Figure 4 is a plan view of the center section and diaphragms.
- Figures 5 to 8 show the air valve in its sequence of operation.
- Figure 9 is a sectional view taken along line 9-9 of Figure 1.
- Figure 10 is a perspective view showing the valve carriage and valve block.
-
- The instant invention generally designated 10 is shown in Figure 1 in perspective and is comprised of a molded
center section 12, twofluid end sections 14 and avalve cover 16. In the preferred embodiment,center section 12 is molded of polyester resin (PBT) Valox 357 - GE Plastic. -
Cover 16 is fixed viaconventional fasteners 18 tocenter section 12. Also affixed viafasteners 18 tocenter section 12 arefluid housings 14. The main portion of the pump comprised ofcenter section 12 andfluid housing 14 is affixed tomanifold base 20 also viafasteners 18. Manifoldbase 20 has fluid inlet andoutlet passages 22 and 24 respectively located at each end to allow variety in plumbing arrangements. - Turning more specifically to Figure 3,
check valves 26 are each comprised of a central sealing area 26A having in the preferred embodiment four radially and axially extending arms 26B extending therefrom and having a surface 26C which closely positionscheck valve 26 incheck valve passages 28. Spring loaded fingers 26D extend from either side of arm 26B and act against the bottom or top ofpassage 28 to biascheck valve 26 into the closed position where it will remain unless fluid pressure against sealing area 26A should press it open. The radially extending guide members 26B also act as a stop. The spring fingers 26D compress and the top of the guide arms 26C butts up against thefluid cover 14 on the inlet check and themanifold base 20 on the outlet check. This limits the check valve travel, -
Members 30 onbase 20 containingpassages 28 are sealed tofluid body 14 by means ofseals 32 carried at the end thereof. - Returning to Figure 1,
cover 16 has anair inlet 32 which pressurises the area underneathcover 18. First and secondauxiliary ports center housing 14 for direct, connection of air from solenoid valves if it is desired to have the pump controlled remotely rather than through the integral air valve. Theintegral ports - Turning to Figures 2, 9 and 10, the air valve assembly generally designated 34 is comprised of a
valve carriage 36 which has generally cylindrical end portions 36A having seals 36B thereon, a rectangular central aperture 36C which retainsmoveable valve block 38. Valveblock 38 has a lower sealing section 38A and a central section 38B within aperture 36C ofcarriage 36 which thereby allowsvalve block 38 to move normal to the plane of Figure 2. This movement occurs due to pushing onblock 38 by means ofpins 40 which are actuated bydiaphragm mounting block 41 in the center ofdiaphragm 42. In the preferred embodiment,valve block 38 is formed of 90 Durometer XNBR (Carboxylated Nitrile) with 10% TFE powder to reduce friction. - As seen in Figure 2, air passages M1 and M2 connect to the main air chambers on the inner side of
diaphragm assemblies 42 for pressurising the air chambers with compressed air as will be more fully described in the operation of the air valve hereinafter. Passages P1 and P2 connect to airchambers 44 and 46 respectively, passages P1 and P2 running as shown in the drawings as straight passages and thence are covered and connected tochambers 44 and 46 bycover 16. -
Valve block 38 is retained in place invalve carriage 36 by boss 16A oncover 16. To disassemble the valve assembly, one merely need removefasteners 18 fromcover 16 and lift cover 16 off whereuponvalve block 38 is lifted upwardly thereby allowingvalve carriage 36 to be slid out ofcenter housing 16. - Figures 5 to 8 show views of the
valve port surface 48 which has five ports therein. Central exhaust port E is connected to theexhaust passage 50 while pilot ports P1 and P2 are connected to first and second ends respectively of thepilot valve carriage 36. Similarly, main ports M1 and M2 are connected to first and second diaphragm air chambers respectively. The space 52 above the ports referred to is generally filled with compressed air and ports which are not covered by thevalve block 38 are pressurised with the compressed air. - In general, two adjacent ports and the exhaust port E are always covered and connected at one time while the other two adjacent ports are fed with compressed air. If we start with the
valve block 38 in the upper right hand position as shown in Figure 5, ports M2 and P1 are connected to exhaust port E while compressed air is fed to ports M1 and P2. In this situation, thepilot valve carriage 36 is at the upward end of its travel while the diaphragms are approaching the left end of their travel whereupon thepins 40 driven by thediaphragms 42 push thevalve block 38 to the upper left hand position shown in Figure 6 which connects compressed air to ports M1 and P1 while exhausting ports P2 and M2. This pressurises the upper end of thepilot valve carriage 36 and moves thepilot valve carriage 36 downwardly and thevalve block 38 into the lower left hand position of Figure 7 whereupon compressed air is connected to ports P1 and M2 and ports M1 and P2 exhaust. - At that point, the diaphragms are moving together to the right while the
pilot value carriage 36 is in the down position. As the diaphragms reach the rightward end of their stroke, thevalve block 38 is moved into the lower right hand position of Figure 8 whereupon compressed air is fed to ports P2 and M2 while ports P1 and M1 are exhausted. This pressurises the lower end of thepilot valve carriage 36 and thepilot valve carriage 36 and thevalve block 38 move upwardly to the point where the description started above. - It can be noted that a very low number of parts is required to produce this valve. The ends of the chambers for the
pilot valve carriage 36 are completed by thevalve cover 16 which also covers the top of the valve cavity at the same time. - The inlet threads on the manifold base are such that it allows use of either all American pipe thread (NPT) or British standard pipe thread (BSP). This hybrid thread may be formed in plastic parts and is intended to form a pressure tight joint with either plastic or brass male pipe threaded fitting of either type thread. The thread is defined as follows:
Major diameter 13.16 mm (0.518" ) Pitch 12.30 mm (0.4843") Minor Diameter 11.45 mm (0.4506" ) Angle 1 degree 47 minutes Threads per inch 7.32 (18.6 threads per cm) Effective thread 10.21 mm (0.402" - The
muffler 54 is best seen in Figure 9. Exhaust port E leads tocylindrical passage 56 which is divided into first and second portions 56A and 56B by divider 56C. The passage is completed by a muffler area 58 inmanifold base 20. Hence, exhaust flows out port E, into first portion 56A and into muffler area 58 whereupon it flows upwardly through second portion 56B and out throughmuffler outlet 60. This arrangement allows substantial muffling at low cost and with little penalty to performance. - It is contemplated that various changes and modifications may be made to the pump without departing from the: scope of the invention as defined by the following claims.
- The aforegoing description has been given by way of example only and it will be appreciated by a person skilled in the art that modifications can be made without departing from the scope of the present invention.
Claims (2)
- A reciprocating air operated pump (10) having pumping elements (42) which reciprocate along a first axis characterised by including, an air valve comprising:a valve carriage (36) moveable along a second axis normal to said first axis;a valve block (38) moveable in said valve carriage along said first axis;a valve surface (48) comprising first and second main ports (M1, M2); first and second pilot ports (P1, P2) and an exhaust port (E);means (40) for causing said valve block to move as said pumping elements move; andmeans for supplying compressed air over said valve surface and wherein said valve block moves in a generally planar rectangular path between four positions,
- The pump of Claim 1 wherein said pump further comprises pilot chambers (44, 46) at each end of said valve carriage, each said pilot port being connected to a respective one of said chambers.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99201777A EP0942171B1 (en) | 1996-04-12 | 1997-04-11 | Double diaphragm pump |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US1565096P | 1996-04-12 | 1996-04-12 | |
US15650 | 1996-04-12 | ||
US837237 | 1997-04-10 | ||
US08/837,237 US5860794A (en) | 1997-04-10 | 1997-04-10 | Double diaphragm pump with air valve block moving in a rectangular pattern |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99201777A Division EP0942171B1 (en) | 1996-04-12 | 1997-04-11 | Double diaphragm pump |
Publications (4)
Publication Number | Publication Date |
---|---|
EP0801228A2 EP0801228A2 (en) | 1997-10-15 |
EP0801228A3 EP0801228A3 (en) | 1999-07-21 |
EP0801228B1 true EP0801228B1 (en) | 2003-07-02 |
EP0801228B9 EP0801228B9 (en) | 2003-10-08 |
Family
ID=26687654
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97302476A Expired - Lifetime EP0801228B9 (en) | 1996-04-12 | 1997-04-11 | Double diaphragm pump |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0801228B9 (en) |
JP (2) | JP4004097B2 (en) |
KR (2) | KR100491065B1 (en) |
CN (2) | CN1081747C (en) |
AR (1) | AR006617A1 (en) |
DE (2) | DE69723144T2 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2463821B (en) * | 2005-05-17 | 2010-06-09 | Thomas Industries Inc | Pump improvements |
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-
1997
- 1997-04-11 CN CN97111233A patent/CN1081747C/en not_active Expired - Fee Related
- 1997-04-11 JP JP09394897A patent/JP4004097B2/en not_active Expired - Fee Related
- 1997-04-11 CN CNB011249986A patent/CN1165699C/en not_active Expired - Fee Related
- 1997-04-11 AR ARP970101462A patent/AR006617A1/en unknown
- 1997-04-11 DE DE69723144T patent/DE69723144T2/en not_active Expired - Fee Related
- 1997-04-11 DE DE69723290T patent/DE69723290T2/en not_active Expired - Fee Related
- 1997-04-11 EP EP97302476A patent/EP0801228B9/en not_active Expired - Lifetime
- 1997-04-12 KR KR1019970013509A patent/KR100491065B1/en not_active IP Right Cessation
-
2004
- 2004-06-11 KR KR1020040042785A patent/KR100461707B1/en not_active IP Right Cessation
-
2007
- 2007-07-06 JP JP2007178316A patent/JP2007285301A/en active Pending
Also Published As
Publication number | Publication date |
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JP2007285301A (en) | 2007-11-01 |
CN1165699C (en) | 2004-09-08 |
DE69723290T2 (en) | 2004-02-05 |
AR006617A1 (en) | 1999-09-08 |
KR100491065B1 (en) | 2005-08-12 |
EP0801228B9 (en) | 2003-10-08 |
EP0801228A2 (en) | 1997-10-15 |
EP0801228A3 (en) | 1999-07-21 |
KR100461707B1 (en) | 2004-12-16 |
DE69723290D1 (en) | 2003-08-07 |
DE69723144T2 (en) | 2004-04-29 |
JP4004097B2 (en) | 2007-11-07 |
CN1174293A (en) | 1998-02-25 |
CN1374455A (en) | 2002-10-16 |
DE69723144D1 (en) | 2003-08-07 |
JPH1030570A (en) | 1998-02-03 |
CN1081747C (en) | 2002-03-27 |
KR19980076691A (en) | 1998-11-16 |
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