EP0781922A1 - Double-acting membrane pump - Google Patents
Double-acting membrane pump Download PDFInfo
- Publication number
- EP0781922A1 EP0781922A1 EP95203667A EP95203667A EP0781922A1 EP 0781922 A1 EP0781922 A1 EP 0781922A1 EP 95203667 A EP95203667 A EP 95203667A EP 95203667 A EP95203667 A EP 95203667A EP 0781922 A1 EP0781922 A1 EP 0781922A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- pump
- valve
- control
- double
- 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.)
- Granted
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 61
- 239000012530 fluid Substances 0.000 claims description 14
- 238000005086 pumping Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
-
- 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
Definitions
- the present invention relates to a double-acting membrane pump comprising a first pump chamber in which a first membrane is arranged a second pump chamber in which a second membrane, coupled to the first membrane, is arranged, each pump chamber being provided with a connection for working fluid and a control device being coupled to each of said connections, for the metered supply of working fluid, which control device comprises at least an electrically controlled pulsing control valve for applying or relieving the pressure on one of the connections to the relevant pump chamber.
- a double-acting membrane pump of this type is disclosed in both European Application 0 386 610 and US Patent 4 818 191.
- Pumps of this type are used, inter alia, for filling packs and other containers of all manner of types.
- One application is the filling of paint cans.
- the pump disclosed in the general prior art is provided with a control device which, like the pump, operates pneumatically.
- This control device comprises a pneumatic reciprocating piston which alternately brings the plenum chamber behind the first membrane and the plenum chamber behind the second membrane under pressure. Change-over from the one position to the other position of the control piston is determined by the relevant membranes coupled to one another reaching the extreme position.
- the reciprocating piston of the device moves to and fro with a specific frequency, which is dependent on the medium pumped and, to a lesser extent, on the pressure of the compressed air.
- This frequency cannot be influenced during the filling cycle.
- changing the air pressure supplied gives rise to the risk that the pump comes to a standstill.
- This too is a disadvantage because, when filling containers to a specific fill weight or volume, in the first instance material can be supplied at high speed whereas at a later stage it is necessary to work at a lower speed. This can be avoided by incorporating an air speed control upstream. With this arrangement the pump still has to execute complete strokes, which leads to the said poor meterability.
- a solution to this problem has been found by the provision of a valve or shut-off device which has various passages. That is to say, a pre-setting of the valve is achieved, by which means the metering accuracy can be set.
- the aim of the present invention is to provide a metering system with which it is possible to meter highly fluctuating amounts of fluid without this resulting in an excessive rise in the cost price of the double-acting membrane pump and the control thereof.
- control valve is constructed such that said valve has a position in which the pressure on both connections to the pump chambers is relieved at the same time in a manner controllable as a function of time.
- the insight on which the invention is based is not to allow the one stroke of the one membrane to follow directly on the preceding stroke of the other membrane.
- a controllable pause can be inserted using the valve according to the invention. As a result, it is also possible to allow only one membrane to carry out work.
- a control of this type can be achieved relatively simply using the microprocessors currently available.
- a three-position valve which can be set to a fixed position in each of the three positions.
- the first position is then, for example, the control for the one membrane, the second position the control for the second membrane and the third position a position in which the pressure on both membranes is relieved.
- the "flow" can be controlled by varying the frequency.
- the membrane pump according to the invention is, moreover, of double-acting construction, a continuous, non-pulsating, output flow of fluid can be obtained, the volume of which can be accurately controlled.
- a container can, for example, be filled accurately on the basis of weight or fill height.
- This control valves preferably have a throttle function.
- the control valves can be of rapidly pulsing design. By, for example, actuating a membrane for a specific time, such a membrane executes a stroke to one side. If the relevant air pulse is sufficiently large, the membrane will execute the complete stroke. In the case of a smaller air pulse, the membrane will execute a short stroke It is possible to reverse the direction of movement without the end position having to be reached.
- the delivery of the pump can be controlled by controlling the duration of the air pulses and the time at which these are applied. With short air pulses, the membranes of the pump will execute only short strokes, as a result of which a low flow can be realised. As a result of the double character of the pump, a pulsing action of this type is not reflected in the metered amount of fluid.
- the pump shown in the single figure is indicated in its entirety by 1. This pump is controlled by a controller indicated in its entirety by 2.
- Pump 1 consists of a first pump chamber 3 and a second pump chamber 4. These chambers are separated by, respectively, a first membrane 5 and a second membrane 6 from a first plenum chamber 11 and a second plenum chamber 12. The membranes are connected to one another via a coupling rod 13. Plenum chambers 11 and 12 are provided with openings 7. In this way plenum chamber 11 is connected to line 14 and plenum chamber 12 to line 15. Line 14 is connected to the first control valve 8, whilst line 15 is connected to second control valve 9. These lines are supplied with air via a line 16. Valves 8 and 9 are controlled by a microprocessor 17. The latter is provided with an input 18 which can be connected to a further microprocessor, which, for example, can be controlled by a weighing unit.
- the common inlet of the membrane pump is indicated by 19 and the common outlet by 20. Ball valves 21 are present.
- a membrane pump of this type is generally known in the prior art.
- the pumps are marketed by Wilden, model M.025 and model M1.
- the apparatus described above functions as follows.
- microprocessor 17 controls control valves 8 and 9 in a pulsing manner with a specific frequency.
- a long pulse is emitted so that the membrane will travel over a relatively long path before the function of the valves 8 and 9 is reversed so that the working direction of the membranes is reversed.
- a short pulse is given, the stroke of the membrane concerned will likewise be shorter.
- throttle device 10 can be (partially) replaced.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
Description
- The present invention relates to a double-acting membrane pump comprising a first pump chamber in which a first membrane is arranged a second pump chamber in which a second membrane, coupled to the first membrane, is arranged, each pump chamber being provided with a connection for working fluid and a control device being coupled to each of said connections, for the metered supply of working fluid, which control device comprises at least an electrically controlled pulsing control valve for applying or relieving the pressure on one of the connections to the relevant pump chamber.
- A double-acting membrane pump of this type is disclosed in both European Application 0 386 610 and US
Patent 4 818 191. - Pumps of this type are used, inter alia, for filling packs and other containers of all manner of types. One application is the filling of paint cans.
- The pump disclosed in the general prior art is provided with a control device which, like the pump, operates pneumatically. This control device comprises a pneumatic reciprocating piston which alternately brings the plenum chamber behind the first membrane and the plenum chamber behind the second membrane under pressure. Change-over from the one position to the other position of the control piston is determined by the relevant membranes coupled to one another reaching the extreme position.
- With this device it is, basically, not possible to restrict the stroke length of the membranes. That is to say, problems arise with the metering accuracy in the final stage of filling packs, for example on a weight basis. This can be avoided by constructing the pump with a relatively small capacity or by connecting various pumps in parallel, but it will be understood that none of these solutions are practicable.
- The reciprocating piston of the device according to the general prior art moves to and fro with a specific frequency, which is dependent on the medium pumped and, to a lesser extent, on the pressure of the compressed air. This frequency cannot be influenced during the filling cycle. After all, changing the air pressure supplied gives rise to the risk that the pump comes to a standstill. This too is a disadvantage because, when filling containers to a specific fill weight or volume, in the first instance material can be supplied at high speed whereas at a later stage it is necessary to work at a lower speed. This can be avoided by incorporating an air speed control upstream. With this arrangement the pump still has to execute complete strokes, which leads to the said poor meterability.
- It is proposed to install a metering valve downstream of the double-acting membrane pump. Although a construction of this type is, as such, able to realise the aims described above, it is clear that the costs increase appreciably as a result and that further installation space is necessary, which is a disadvantage in certain applications.
- In the construction described in US
Patent 4 818 191 an alternating valve is present, which can be actuated electrically and with which pressure can be applied alternately to the one and then to the other membrane. - As a result of the electrical control, accurate control of the amplitude and frequency of the membrane movement can be obtained.
- However, control problems arise when metering highly fluctuating amounts per unit time. The movement executed by the membrane will, after all, follow a sinusoidal path and when dispensing very small amounts it is particularly difficult to obtain a sufficiently accurate controlled outward movement of the membranes in order to realise the desired metering accuracy.
- A solution to this problem has been found by the provision of a valve or shut-off device which has various passages. That is to say, a pre-setting of the valve is achieved, by which means the metering accuracy can be set.
- Although a construction of this type is reasonably adequate, such a construction has the disadvantage that the price of such valves is particularly high.
- The aim of the present invention is to provide a metering system with which it is possible to meter highly fluctuating amounts of fluid without this resulting in an excessive rise in the cost price of the double-acting membrane pump and the control thereof.
- This aim is achieved with a membrane pump as described above in that said control valve is constructed such that said valve has a position in which the pressure on both connections to the pump chambers is relieved at the same time in a manner controllable as a function of time.
- The insight on which the invention is based is not to allow the one stroke of the one membrane to follow directly on the preceding stroke of the other membrane. A controllable pause can be inserted using the valve according to the invention. As a result, it is also possible to allow only one membrane to carry out work.
- With this construction the sinusoidal path described above is no longer necessary for metering very small amounts. It is possible to give a number of 'square wave pulses'. It will be understood that a very small amount of material can still be metered with a readily controllable relatively large amplitude of the membrane. Moreover, it will be understood that bringing the movement to rest can be carried out relatively simply. This is, for example, possible by fitting two control valves, one control valve always serving to provide the connection between the pressurised fluid and the pressure side of the membrane, whilst the valve has an on/off position. If both valves are controlled such that they are in the off position, there will be no pressure acting on any side of the membrane whatsoever. As a result, the membrane pump is in the rest position.
- A control of this type can be achieved relatively simply using the microprocessors currently available.
- For further equalising of the pressure it is possible to install a buffer downstream of the membrane pump outlet for the fluid to be pumped.
- It is likewise possible to use a three-position valve which can be set to a fixed position in each of the three positions. The first position is then, for example, the control for the one membrane, the second position the control for the second membrane and the third position a position in which the pressure on both membranes is relieved.
- The various features must be differentiated from the construction which is shown in the abovementioned European Patent Application 0 386 610. In the latter construction the position in which both connections to the membrane pump between the working fluid and the source of the working fluid are interrupted is not controllable and constitutes solely an uncontrollable fractional part of the alternating stroke of the alternating valve concerned.
- With the device according to the invention it is, moreover, possible to control and to vary the stroke length very accurately.
- It is also possible to determine the frequency independently of the progression in the movement of the membranes. The "flow" can be controlled by varying the frequency. As the membrane pump according to the invention is, moreover, of double-acting construction, a continuous, non-pulsating, output flow of fluid can be obtained, the volume of which can be accurately controlled. As a result, a container can, for example, be filled accurately on the basis of weight or fill height.
- This control valves preferably have a throttle function. To this end, the control valves can be of rapidly pulsing design. By, for example, actuating a membrane for a specific time, such a membrane executes a stroke to one side. If the relevant air pulse is sufficiently large, the membrane will execute the complete stroke. In the case of a smaller air pulse, the membrane will execute a short stroke It is possible to reverse the direction of movement without the end position having to be reached. The delivery of the pump can be controlled by controlling the duration of the air pulses and the time at which these are applied. With short air pulses, the membranes of the pump will execute only short strokes, as a result of which a low flow can be realised. As a result of the double character of the pump, a pulsing action of this type is not reflected in the metered amount of fluid.
- In contrast to the "sliding valve" used in the general prior art, reversal of the stroke movement, after which the other pump chamber becomes effective for pressurising fluids, does not automatically take place after the end position is reached. With the installation according to the invention it is possible to insert a "pause". In this way a very accurate final metering for filling containers of all manner of types can be achieved.
- The invention will be explained in more detail below with reference to an illustrative embodiment shown in the drawing
- In the drawing the single figure shows a conventional membrane pump provided with modifications, and a controller coupled thereto, according to the invention.
- The pump shown in the single figure is indicated in its entirety by 1. This pump is controlled by a controller indicated in its entirety by 2.
-
Pump 1 consists of afirst pump chamber 3 and asecond pump chamber 4. These chambers are separated by, respectively, afirst membrane 5 and a second membrane 6 from afirst plenum chamber 11 and asecond plenum chamber 12. The membranes are connected to one another via acoupling rod 13.Plenum chambers openings 7. In thisway plenum chamber 11 is connected to line 14 andplenum chamber 12 to line 15.Line 14 is connected to thefirst control valve 8, whilst line 15 is connected to second control valve 9. These lines are supplied with air via aline 16.Valves 8 and 9 are controlled by amicroprocessor 17. The latter is provided with aninput 18 which can be connected to a further microprocessor, which, for example, can be controlled by a weighing unit. - The common inlet of the membrane pump is indicated by 19 and the common outlet by 20.
Ball valves 21 are present. A membrane pump of this type is generally known in the prior art. For example, the pumps are marketed by Wilden, model M.025 and model M1. The apparatus described above functions as follows. - Depending on the signal on
line 18,microprocessor 17 controls controlvalves 8 and 9 in a pulsing manner with a specific frequency. With this arrangement it is possible that a long pulse is emitted so that the membrane will travel over a relatively long path before the function of thevalves 8 and 9 is reversed so that the working direction of the membranes is reversed. When a short pulse is given, the stroke of the membrane concerned will likewise be shorter. It is also possible to supply a series of pulses to a membrane. In this way, throttle device 10 can be (partially) replaced. - It will be understood that in this way in the first instance a large volume of fluid can be pumped, whilst at the end of the pumping cycle the speed of the double-acting membrane pump can be appreciably reduced without this resulting in a pulsating fluid flow.
- An example of actuating the valves will be given below:
- At 100 % pump speed,
control valve 8 opens for 250 milliseconds. Valve 9 then opens for 250 milliseconds, whilst air bleeds fromvalve 8, etc. - At 50 % actuation,
valve 8 opens for 125 milliseconds and is vented for 125 milliseconds without valve 9 being actuated (pause), after which valve 9 is opened for 125 milliseconds and is then vented, etc. - At 20 % actuation,
valve 8 opens for 50 milliseconds and is vented for 200 milliseconds without valve 9 being actuated (pause), after which valve 9 is opened in the same way. - In this way very regular discharge behaviour is achieved without a large number of pulses in the pump.
- Although the invention has been described above with reference to a preferred embodiment, it must be understood that numerous modifications can be made thereto without going beyond the scope of the present application. For instance, it is possible to use a single control valve instead of the two control valves shown here, which will result in further savings in cost. In that case, said single valve is constructed as an alternating valve (optionally with three positions).
- This and other alternative embodiments obvious to a person skilled in the art are considered to fall within the scope of the present claims.
Claims (5)
- Double-acting membrane pump (1) comprising a first pump chamber (3) in which a first membrane (5) is arranged and a second pump chamber (4) in which a second membrane (6), coupled to the first membrane, is arranged, each pump chamber being provided with a connection (7) for working fluid and a control device being coupled to each of said connections, for the metered supply of working fluid, which control device comprises at least an electrically controlled pulsing control valve (8, 9) for applying or relieving the pressure on one of the connections to the relevant pump chamber, characterised in that said control valve is constructed such that said valve has a position in which the pressure on both connections to the pump chambers is relieved at the same time in a manner controllable as a function of time.
- Membrane pump according to Claim 1, containing two on/off control valves.
- Membrane pump according to Claim 1, containing a three-way valve, wherein one position is a position in which the pressure is relieved on both connections.
- Membrane pump according to one of the preceding claims, characterised in that the control device comprises a microprocessor.
- Method for metering the amount dispensed by a double-sided membrane pump, comprising control of the frequency and the stroke of each of the membranes, characterised in that the duration of the 0 position of the membranes is controlled.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69519520T DE69519520T2 (en) | 1995-12-28 | 1995-12-28 | Double diaphragm pump |
EP95203667A EP0781922B1 (en) | 1995-12-28 | 1995-12-28 | Double-acting membrane pump |
AT95203667T ATE197837T1 (en) | 1995-12-28 | 1995-12-28 | DOUBLE DIAPHRAGM PUMP |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95203667A EP0781922B1 (en) | 1995-12-28 | 1995-12-28 | Double-acting membrane pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0781922A1 true EP0781922A1 (en) | 1997-07-02 |
EP0781922B1 EP0781922B1 (en) | 2000-11-29 |
Family
ID=8221029
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95203667A Expired - Lifetime EP0781922B1 (en) | 1995-12-28 | 1995-12-28 | Double-acting membrane pump |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0781922B1 (en) |
AT (1) | ATE197837T1 (en) |
DE (1) | DE69519520T2 (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015119717A1 (en) * | 2014-02-07 | 2015-08-13 | Graco Minnesota Inc. | Pulseless positive displacement pump and method of pulselessly displacing fluid |
US10919060B2 (en) | 2008-10-22 | 2021-02-16 | Graco Minnesota Inc. | Portable airless sprayer |
US10926275B1 (en) | 2020-06-25 | 2021-02-23 | Graco Minnesota Inc. | Electrostatic handheld sprayer |
US10968903B1 (en) | 2020-06-04 | 2021-04-06 | Graco Minnesota Inc. | Handheld sanitary fluid sprayer having resilient polymer pump cylinder |
US11022106B2 (en) | 2018-01-09 | 2021-06-01 | Graco Minnesota Inc. | High-pressure positive displacement plunger pump |
US11174854B2 (en) | 2020-03-31 | 2021-11-16 | Graco Minnesota Inc. | Electrically operated displacement pump control system and method |
CN114922801A (en) * | 2022-04-27 | 2022-08-19 | 上海侠飞泵业有限公司 | High-pressure pneumatic diaphragm pump |
US11707753B2 (en) | 2019-05-31 | 2023-07-25 | Graco Minnesota Inc. | Handheld fluid sprayer |
US11986850B2 (en) | 2018-04-10 | 2024-05-21 | Graco Minnesota Inc. | Handheld airless sprayer for paints and other coatings |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10354314B4 (en) * | 2003-11-20 | 2006-06-01 | Thomas Kwapis | Underwater snowmobiles |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2518660A1 (en) * | 1981-12-23 | 1983-06-24 | Champion Spark Plug Co | DIAPHRAGM PUMP |
US4818191A (en) * | 1982-03-31 | 1989-04-04 | Neyra Industries, Inc. | Double-acting diaphragm pump system |
EP0386610A1 (en) * | 1989-03-07 | 1990-09-12 | John Russell Schneider | Constant output pump |
WO1992019867A1 (en) * | 1991-05-03 | 1992-11-12 | Hans Willi Meinz | Process and device for the controlled metering of at least one pourable component |
-
1995
- 1995-12-28 EP EP95203667A patent/EP0781922B1/en not_active Expired - Lifetime
- 1995-12-28 DE DE69519520T patent/DE69519520T2/en not_active Expired - Fee Related
- 1995-12-28 AT AT95203667T patent/ATE197837T1/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2518660A1 (en) * | 1981-12-23 | 1983-06-24 | Champion Spark Plug Co | DIAPHRAGM PUMP |
US4818191A (en) * | 1982-03-31 | 1989-04-04 | Neyra Industries, Inc. | Double-acting diaphragm pump system |
EP0386610A1 (en) * | 1989-03-07 | 1990-09-12 | John Russell Schneider | Constant output pump |
WO1992019867A1 (en) * | 1991-05-03 | 1992-11-12 | Hans Willi Meinz | Process and device for the controlled metering of at least one pourable component |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10919060B2 (en) | 2008-10-22 | 2021-02-16 | Graco Minnesota Inc. | Portable airless sprayer |
US11779945B2 (en) | 2008-10-22 | 2023-10-10 | Graco Minnesota Inc. | Portable airless sprayer |
US11759808B1 (en) | 2008-10-22 | 2023-09-19 | Graco Minnesota Inc. | Portable airless sprayer |
US11623234B2 (en) | 2008-10-22 | 2023-04-11 | Graco Minnesota Inc. | Portable airless sprayer |
US11446689B2 (en) | 2008-10-22 | 2022-09-20 | Graco Minnesota Inc. | Portable airless sprayer |
US11446690B2 (en) | 2008-10-22 | 2022-09-20 | Graco Minnesota Inc. | Portable airless sprayer |
CN105980709B (en) * | 2014-02-07 | 2018-01-19 | 固瑞克明尼苏达有限公司 | The method of no pulse formula positive-displacement pump and no pulse formula discharge fluid |
US10072650B2 (en) | 2014-02-07 | 2018-09-11 | Graco Minnesota, Inc. | Method of pulselessly displacing fluid |
US10161393B2 (en) | 2014-02-07 | 2018-12-25 | Graco Minnesota Inc. | Mechanical drive system for a pulseless positive displacement pump |
US11867165B2 (en) | 2014-02-07 | 2024-01-09 | Graco Minnesota Inc. | Drive system for a positive displacement pump |
CN105980709A (en) * | 2014-02-07 | 2016-09-28 | 固瑞克明尼苏达有限公司 | Pulseless positive displacement pump and method of pulselessly displacing fluid |
US9638185B2 (en) | 2014-02-07 | 2017-05-02 | Graco Minnesota Inc. | Pulseless positive displacement pump and method of pulselessly displacing fluid |
WO2015119717A1 (en) * | 2014-02-07 | 2015-08-13 | Graco Minnesota Inc. | Pulseless positive displacement pump and method of pulselessly displacing fluid |
US9784265B2 (en) | 2014-02-07 | 2017-10-10 | Graco Minnesota Inc. | Electric drive system for a pulseless positive displacement pump |
US9777721B2 (en) | 2014-02-07 | 2017-10-03 | Graco Minnesota Inc. | Hydraulic drive system for a pulseless positive displacement pump |
US9777722B2 (en) | 2014-02-07 | 2017-10-03 | Graco Minnesota Inc. | Pulseless positive displacement pump and method of pulselessly displacing fluid |
US11022106B2 (en) | 2018-01-09 | 2021-06-01 | Graco Minnesota Inc. | High-pressure positive displacement plunger pump |
US11986850B2 (en) | 2018-04-10 | 2024-05-21 | Graco Minnesota Inc. | Handheld airless sprayer for paints and other coatings |
US11707753B2 (en) | 2019-05-31 | 2023-07-25 | Graco Minnesota Inc. | Handheld fluid sprayer |
US11655810B2 (en) | 2020-03-31 | 2023-05-23 | Graco Minnesota Inc. | Electrically operated displacement pump control system and method |
US11434892B2 (en) | 2020-03-31 | 2022-09-06 | Graco Minnesota Inc. | Electrically operated displacement pump assembly |
US11174854B2 (en) | 2020-03-31 | 2021-11-16 | Graco Minnesota Inc. | Electrically operated displacement pump control system and method |
US12092090B2 (en) | 2020-03-31 | 2024-09-17 | Graco Minnesota Inc. | Electrically operated displacement pump control system and method |
US10968903B1 (en) | 2020-06-04 | 2021-04-06 | Graco Minnesota Inc. | Handheld sanitary fluid sprayer having resilient polymer pump cylinder |
US11738358B2 (en) | 2020-06-25 | 2023-08-29 | Graco Minnesota Inc. | Electrostatic handheld sprayer |
US10926275B1 (en) | 2020-06-25 | 2021-02-23 | Graco Minnesota Inc. | Electrostatic handheld sprayer |
CN114922801B (en) * | 2022-04-27 | 2023-11-28 | 上海侠飞泵业有限公司 | High-pressure pneumatic diaphragm pump |
CN114922801A (en) * | 2022-04-27 | 2022-08-19 | 上海侠飞泵业有限公司 | High-pressure pneumatic diaphragm pump |
Also Published As
Publication number | Publication date |
---|---|
EP0781922B1 (en) | 2000-11-29 |
DE69519520D1 (en) | 2001-01-04 |
DE69519520T2 (en) | 2001-06-13 |
ATE197837T1 (en) | 2000-12-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA1134332A (en) | Precision material filling systems | |
EP0781922B1 (en) | Double-acting membrane pump | |
EP1030972B1 (en) | Dispensing unit for a fluid dispensing machine, comprising a variable-volume pumping chamber, and machine comprising said dispensing unit | |
US4540349A (en) | Air driven pump | |
US4863066A (en) | System for dispensing precisely metered quantities of a fluid and method of utilizing the system | |
JP2004210544A (en) | Pumping apparatus for powder, method for powder, and powder coating apparatus | |
US4026439A (en) | Precision fluid dispensing and mixing system | |
US4771726A (en) | Apparatus for dispensing flowable materials | |
SE449771B (en) | PUMP DEVICE FOR PULSATION-FREE SUPPORT OF A LIQUID MEDIUM | |
JP4598377B2 (en) | Multi-component weighing and dispensing device | |
EP1455567B2 (en) | Electronic proportioner using continuous metering and correction | |
EP0142204B1 (en) | Method and apparatus for volumetric dosing viscous products | |
US5961303A (en) | Positive displacement dispensing pump system | |
US4708603A (en) | Variable displacement pump | |
CA1130150A (en) | Pumping system for unstable fluids | |
US20050089428A1 (en) | Pump pulsation dampening attachment and method for dampening pump pulsations | |
EP0248514B1 (en) | System and method for dispensing metered quantities of a fluid | |
EP0479559A1 (en) | Apparatus for filling containers with a liquid | |
EP0386610A1 (en) | Constant output pump | |
RU2003170C1 (en) | Method and device for air blowing-out from vessel while it filling by setting portion of liquid | |
CA2222927A1 (en) | Apparatus and method for dispensing fluid material | |
EP1762138B1 (en) | Electronic porportioner using continuous metering and correction | |
US3037674A (en) | Metering device | |
US3637116A (en) | Fluid-operated piston for metering gravity fed material | |
CN2361099Y (en) | High-precision quantitative liquid supply device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE |
|
17P | Request for examination filed |
Effective date: 19971201 |
|
17Q | First examination report despatched |
Effective date: 19991123 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20001129 Ref country code: GR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20001129 Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 20001129 Ref country code: CH Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20001129 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20001129 |
|
REF | Corresponds to: |
Ref document number: 197837 Country of ref document: AT Date of ref document: 20001215 Kind code of ref document: T |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20001228 Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20001228 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20001229 Year of fee payment: 6 Ref country code: FR Payment date: 20001229 Year of fee payment: 6 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20001231 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20001231 Year of fee payment: 6 |
|
REF | Corresponds to: |
Ref document number: 69519520 Country of ref document: DE Date of ref document: 20010104 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20010112 Year of fee payment: 6 |
|
ITF | It: translation for a ep patent filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010129 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20010228 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20010228 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20010228 |
|
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
BERE | Be: lapsed |
Owner name: VAN WIJK ENGINEERING B.V. Effective date: 20001231 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: MM4A |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20011228 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020701 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020702 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20011228 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020830 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20020701 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20051228 |