CA2237612A1 - Device with at least two drive cylinders - Google Patents
Device with at least two drive cylinders Download PDFInfo
- Publication number
- CA2237612A1 CA2237612A1 CA 2237612 CA2237612A CA2237612A1 CA 2237612 A1 CA2237612 A1 CA 2237612A1 CA 2237612 CA2237612 CA 2237612 CA 2237612 A CA2237612 A CA 2237612A CA 2237612 A1 CA2237612 A1 CA 2237612A1
- Authority
- CA
- Canada
- Prior art keywords
- piston
- displacement pump
- positive displacement
- pistons
- disposed
- 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.)
- Abandoned
Links
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 claims description 8
- 238000007373 indentation Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000033001 locomotion Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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
- 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
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
- F04B9/1176—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor
- F04B9/1178—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each piston in one direction being obtained by a single-acting piston liquid motor the movement in the other direction being obtained by a hydraulic connection between the liquid motor cylinders
-
- 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
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
- F04B11/0058—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons with piston speed control
- F04B11/0066—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons with piston speed control with special shape of the actuating element
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention relates to a device with at least two drive cylinders in each of which a first piston with a forward connecting rod is movable and where the first pistons are coupled together, said first pistons have a rear connecting rod which are connected to at least one eccentric control. In the invention, the eccentric control is an out-round mirror-image contoured plate, making virtually any shape of the devices's characteristic possible. The device may, for example, be used in pumps.
Description
CA 02237612 1998-0~-13 FILE, ~ IN TI~IS A~NDE~
~TRANSLAT~ON
DESCRIPTION
DEVICE WITH AT LEAST TWO DRIVE CYLINDERS
s The invention relates to a device with at least two drive cylinders, with a first piston with a forward piston rod movably disposed in each of the drive cylinders, wherein the first pistons are coupled with each other, wherein the first pistons have a rear piston rod and wherein the rear piston rods are coupled to at least one eccentric control mechanism.
Devices of this type are required in many technical fields for achieving a uniform force-transmitting back and forth movement between two or more cylinder pistons.
Referenced here as an example is the publication "Dickstoffpumpe der Baureihe KOS" (Series KOS thick maffer pump) by the company Putzmeister-Werk Maschinenfabrik GmbH, 72631 Alchtal, Germany. The publication describes devices according the preamble which are used in pumps adapted for thick matter containing coarse grains, e.g. concrete. In these pumps, the pistonrods of the drive cylinders are connected with the pistons of the conveying cylinders which convey the thick matter. The first pistons which are connected with each other by way of a rocking oil, are operated via a hydraulic drive. The CA 02237612 1998-0~-13 use of a hydraulic drive is advantageous because long piston strokes improve the valve kinematics. The displacement kinematics can also be so designed as to enable a transport at low pulsation and the hydraulic aggregate need not form a single unit with the pumpl i.e. it can be remotely controlled. The hydraulic aggregates which typically include a high-pressure pump, a complex electro-hydraulic control as well as cooling, filter and pipes, are however very expensive.
German Pat. No. DE-A-34 46 107 describes two pistons connected with each other through a fluid column which can have different diameters for providing a force translation.
JP 61-49 177 A which forms the basis for the preamble of the present invention, describes a device with several drive cylinders, with each drive cylinder having movably disposed therein a first piston with a forward piston rod, wherein the first pistons are coupled with each other through a line. In addition, each of the first pistons has a rear piston side which is connected to a control eccentric. Three control eccentrics are arranged side-by-side on a shaft so as to require a pressure source to compensate for pulsations. As the eccentric control cam is a mechanical device, the characteristic velocity curves are fixed and cannot be adapted to different applications.
CA 02237612 1998-0~-13 It is therefore an object of the invention to develop a device according to the preamble in which the characteristic curve can be varied easily and thereby adapted to the respective requirements. In particular, this device should be capable of generating non-sinusoidal characteristic curves.
s This object is solved in accordance with the invention by providing the eccentric control mechanism in the form of a non-circular, mirror-symmetric profiled disk.
An eccentric control mechanism in the form of a profiled disk for operating the piston of the drive cylinder is a cost-effective, safe and low maintenance alternative to a hydraulic aggregate. Unlike conventional control eccentrics, profiled disks enable a variation of the characteristic curves, a fact that is advantageous, for example, in applications involving pumps. By varying the form of the profiled disk, practically any characteristic curve can be attained. The use of profiled disks effecting a non-sinusoidal characteristic curve can significantly improve the efficiency of e.g. a pump and also provide a constant feed velocity and rapid opening and closing velocities of the valves.
Advantageously, with the device of the invention neither a pressure compensation nor a continuous pressurization of the piston is required.
CA 02237612 1998-0~-13 According to a feature of the invention, the profiled disk is configured in the shape of a heart.
In accordance with the invention, a decreasing acceleration angle results in a more pronounced indentation characterizing the shape of the heart.
Further, it is suitable to provide at least two profiled disks which are arranged on one or more shafts.
o Advantageously, the profiled disk can be exchanged.
According to another feature of the invention, the first pistons are hydraulically coupled with each other via a line disposed between the drive cylinders and an essentially incompressible fluid disposed in the region between the first pistons.
In accordance with the invention, it may be suitable to substitute each of the first pistons having a forward and a rear piston rod, with a first piston having a forward piston rod and a second piston having a rear piston rod and coupled to the first piston.
Furthermore, it may be provided to arrange each of the first pistons in a CA 02237612 1998-0~-13 respective drive cylinder, and the second piston in a second cylinder, with both cylinders have different diameters.
The different diameters of the cylinders provide a transmission ratio which, for example, allows the eccentric to operate at small stroke.
It may be suitable to mechanically couple the respective first piston and the second piston.
Advantageously, the first piston and the second piston can be hydraulically coupled via a second line disposed between the drive cylinder and the second cylinder and by an essentially incompressible fluid disposed in the region between the first and the second piston.
According to the invention, the incompressible fluid can be a rocking oil.
It is within the scope of the invention to make the first and the second line of a flexible material.
This feature can be advantageous in tight spaces.
Finally, the invention also provides for the use of the device to drive CA 02237612 1998-0~-13 positive displacement pumps with at least two cylinders.
Exemplary embodiments of the invention will be described hereinafter with reference to the drawing, in which:
FIG. 1a and FIG. 1b show two views of a device according to the invention with two profiled disks arranged on a shaft, FIG.2 is a perspective view of the device according o FIGS.1 a and 1 b, FIG. 3a and FIG. 3b show two views of a device according to the invention with two profiled disks arranged on a shaft and respective first and second cylinders, FIG.4 is a perspective view of the device according to FIGS. 3a and 3b, FIG. 5a and FIG. 5b show two views of a device according to the invention, wherein the pistons rods are actuated by a profiled disk, FIG.6 is a perspective view of the device according CA 02237612 1998-0~-13 to FIGS. 5a and 5b, FIG. 7a and FIG. 7b show a profiled disk with associated v-(p characteristic curve~ with the acceleration angle amounting to 10~, FIG. 8a and FIG. 8b show a profiled disk with associated v-(p characteristic curve, with the acceleration angle amounting to 20~, FIG. 9a and FIG. 9b show a profiled disk with associated v-(p o characteristic curve~ with the acceleration angle amounting to 30~, FIG. 10a and FIG. 10b a profiled disk with associated v-(p characteristic curve, with the acceleration angle amounting to 60~.
The device illustrated in FIGS. 1a and 1b and used in all examples in a piston pump with two conveying cylinders 1 has two profiled disks 9 which are arranged on a shaft 8 and mutually offset by 180~. Each profiled disk 9 actuates a rear piston rod 12 which is connected to a respective piston 6 moving in a drive cylinder 4. Each of the pistons 6 also has a forward piston rod 5 which is connected a respective piston 2 moving in a conveyor cylinder 1 The two pistons 6 are coupled to one another - as illustrated in the present example - via a line 3 extending between the drive cylinders 4 and an essentially CA 02237612 1998-0~-13 incompressible fluid, a so-called rocking oil, disposed in an area between the two pistons 6. Unlike crank drives, the random shape of the profiled disks 6 enables also non-sinusoidal motions of the pistons 6 and 2. The profiled disks 9 can be driven in any suitable fashion, e.g. by an electromotor.
The device operates as follows:
A profiled disk 9 drives a piston 6 disposed in one of the drive cylinders 4 via a piston rod 12. The rocking oil is thereby displaced from one drive cylinder 4 o via the line 3 into the other drive cylinder 4. The piston 6 which is disposed in drive cylinder 4 and has a piston rod 12, then moves to the upper end of the drive cylinder 4. As the result, the piston 2 in the corresponding conveying cylinder 1 is also driven to the upper end, thus creating a suction in this conveying cylinder 1. The motion is subsequently reversed, whereby the piston 2 presses the drawn-in conveying fluid out of the cylinder 1, while suction is generated in the other conveying cylinder 1.
The pumping operation is controlled by suction and pressure valves (not shown).
Unlike in the embodiment described above which has a piston 6 with a front and rear piston rod 5, 12, the embodiment illustrated in FIGS. 3a, 3b and 4 CA 02237612 1998-0~-13 employs two pistons 6, 12 which are coupled together, wherein the first piston 6 with the forward piston rod 5 is disposed in drive cylinder 4 and the second piston 11 with the rear piston rod 12 is disposed in a second cylinder 10. The drive cylinder 4 and the second cylinder 10 are connected to one another via a s second line 7 which can be flexible.
The second cylinder 10 and the drive cylinder 4 have different diameters;
in the illustrated example the second cylinder 10 has a larger diameter than the drive cylinder 4. The difference in diameters provides a "transmission ratio" for o the movements of the piston rods 5, 12. In the present example, the larger diameter of the second cylinder 10 enables shorter strokes of piston 11 and thus smaller eccentricities of the profiled disks 9.
In another embodiment illustrated in FIGS. 5a, 5b and 6, the second cylinders 10 and consequently also the rear piston rods 12 of the pistons 11 are arranged in such a way that a single profiled disk 9 is sufficient to control both piston rods 12.
Referring now to FIGS. 7a to 10b, there are depicted the non-circular mirror-symmetric shape of the profiled disks 9 in accordance with the invention as well as the effect of the shape of the profiled disks 9 on the characteristic v-(p curve. The more pronounced the selected heart shape, (the heart shape is most CA 02237612 1998-0~-13 pronounced in FIG. 7a), i.e. the deeper the indentation 13, the smaller the acceleration angle. At small acceleration angles, the conveying velocity is constant over an extended range even if only one profiled disk 9 is employed.
The desired characteristic curve can now be selected based on the aforedescribed results, and the device can be adapted to the prevailing conditions by exchanging the profiled disks 9.
The profiled disks 9 can be machined, for example with CNC machines capable of providing almost any shape.
~TRANSLAT~ON
DESCRIPTION
DEVICE WITH AT LEAST TWO DRIVE CYLINDERS
s The invention relates to a device with at least two drive cylinders, with a first piston with a forward piston rod movably disposed in each of the drive cylinders, wherein the first pistons are coupled with each other, wherein the first pistons have a rear piston rod and wherein the rear piston rods are coupled to at least one eccentric control mechanism.
Devices of this type are required in many technical fields for achieving a uniform force-transmitting back and forth movement between two or more cylinder pistons.
Referenced here as an example is the publication "Dickstoffpumpe der Baureihe KOS" (Series KOS thick maffer pump) by the company Putzmeister-Werk Maschinenfabrik GmbH, 72631 Alchtal, Germany. The publication describes devices according the preamble which are used in pumps adapted for thick matter containing coarse grains, e.g. concrete. In these pumps, the pistonrods of the drive cylinders are connected with the pistons of the conveying cylinders which convey the thick matter. The first pistons which are connected with each other by way of a rocking oil, are operated via a hydraulic drive. The CA 02237612 1998-0~-13 use of a hydraulic drive is advantageous because long piston strokes improve the valve kinematics. The displacement kinematics can also be so designed as to enable a transport at low pulsation and the hydraulic aggregate need not form a single unit with the pumpl i.e. it can be remotely controlled. The hydraulic aggregates which typically include a high-pressure pump, a complex electro-hydraulic control as well as cooling, filter and pipes, are however very expensive.
German Pat. No. DE-A-34 46 107 describes two pistons connected with each other through a fluid column which can have different diameters for providing a force translation.
JP 61-49 177 A which forms the basis for the preamble of the present invention, describes a device with several drive cylinders, with each drive cylinder having movably disposed therein a first piston with a forward piston rod, wherein the first pistons are coupled with each other through a line. In addition, each of the first pistons has a rear piston side which is connected to a control eccentric. Three control eccentrics are arranged side-by-side on a shaft so as to require a pressure source to compensate for pulsations. As the eccentric control cam is a mechanical device, the characteristic velocity curves are fixed and cannot be adapted to different applications.
CA 02237612 1998-0~-13 It is therefore an object of the invention to develop a device according to the preamble in which the characteristic curve can be varied easily and thereby adapted to the respective requirements. In particular, this device should be capable of generating non-sinusoidal characteristic curves.
s This object is solved in accordance with the invention by providing the eccentric control mechanism in the form of a non-circular, mirror-symmetric profiled disk.
An eccentric control mechanism in the form of a profiled disk for operating the piston of the drive cylinder is a cost-effective, safe and low maintenance alternative to a hydraulic aggregate. Unlike conventional control eccentrics, profiled disks enable a variation of the characteristic curves, a fact that is advantageous, for example, in applications involving pumps. By varying the form of the profiled disk, practically any characteristic curve can be attained. The use of profiled disks effecting a non-sinusoidal characteristic curve can significantly improve the efficiency of e.g. a pump and also provide a constant feed velocity and rapid opening and closing velocities of the valves.
Advantageously, with the device of the invention neither a pressure compensation nor a continuous pressurization of the piston is required.
CA 02237612 1998-0~-13 According to a feature of the invention, the profiled disk is configured in the shape of a heart.
In accordance with the invention, a decreasing acceleration angle results in a more pronounced indentation characterizing the shape of the heart.
Further, it is suitable to provide at least two profiled disks which are arranged on one or more shafts.
o Advantageously, the profiled disk can be exchanged.
According to another feature of the invention, the first pistons are hydraulically coupled with each other via a line disposed between the drive cylinders and an essentially incompressible fluid disposed in the region between the first pistons.
In accordance with the invention, it may be suitable to substitute each of the first pistons having a forward and a rear piston rod, with a first piston having a forward piston rod and a second piston having a rear piston rod and coupled to the first piston.
Furthermore, it may be provided to arrange each of the first pistons in a CA 02237612 1998-0~-13 respective drive cylinder, and the second piston in a second cylinder, with both cylinders have different diameters.
The different diameters of the cylinders provide a transmission ratio which, for example, allows the eccentric to operate at small stroke.
It may be suitable to mechanically couple the respective first piston and the second piston.
Advantageously, the first piston and the second piston can be hydraulically coupled via a second line disposed between the drive cylinder and the second cylinder and by an essentially incompressible fluid disposed in the region between the first and the second piston.
According to the invention, the incompressible fluid can be a rocking oil.
It is within the scope of the invention to make the first and the second line of a flexible material.
This feature can be advantageous in tight spaces.
Finally, the invention also provides for the use of the device to drive CA 02237612 1998-0~-13 positive displacement pumps with at least two cylinders.
Exemplary embodiments of the invention will be described hereinafter with reference to the drawing, in which:
FIG. 1a and FIG. 1b show two views of a device according to the invention with two profiled disks arranged on a shaft, FIG.2 is a perspective view of the device according o FIGS.1 a and 1 b, FIG. 3a and FIG. 3b show two views of a device according to the invention with two profiled disks arranged on a shaft and respective first and second cylinders, FIG.4 is a perspective view of the device according to FIGS. 3a and 3b, FIG. 5a and FIG. 5b show two views of a device according to the invention, wherein the pistons rods are actuated by a profiled disk, FIG.6 is a perspective view of the device according CA 02237612 1998-0~-13 to FIGS. 5a and 5b, FIG. 7a and FIG. 7b show a profiled disk with associated v-(p characteristic curve~ with the acceleration angle amounting to 10~, FIG. 8a and FIG. 8b show a profiled disk with associated v-(p characteristic curve, with the acceleration angle amounting to 20~, FIG. 9a and FIG. 9b show a profiled disk with associated v-(p o characteristic curve~ with the acceleration angle amounting to 30~, FIG. 10a and FIG. 10b a profiled disk with associated v-(p characteristic curve, with the acceleration angle amounting to 60~.
The device illustrated in FIGS. 1a and 1b and used in all examples in a piston pump with two conveying cylinders 1 has two profiled disks 9 which are arranged on a shaft 8 and mutually offset by 180~. Each profiled disk 9 actuates a rear piston rod 12 which is connected to a respective piston 6 moving in a drive cylinder 4. Each of the pistons 6 also has a forward piston rod 5 which is connected a respective piston 2 moving in a conveyor cylinder 1 The two pistons 6 are coupled to one another - as illustrated in the present example - via a line 3 extending between the drive cylinders 4 and an essentially CA 02237612 1998-0~-13 incompressible fluid, a so-called rocking oil, disposed in an area between the two pistons 6. Unlike crank drives, the random shape of the profiled disks 6 enables also non-sinusoidal motions of the pistons 6 and 2. The profiled disks 9 can be driven in any suitable fashion, e.g. by an electromotor.
The device operates as follows:
A profiled disk 9 drives a piston 6 disposed in one of the drive cylinders 4 via a piston rod 12. The rocking oil is thereby displaced from one drive cylinder 4 o via the line 3 into the other drive cylinder 4. The piston 6 which is disposed in drive cylinder 4 and has a piston rod 12, then moves to the upper end of the drive cylinder 4. As the result, the piston 2 in the corresponding conveying cylinder 1 is also driven to the upper end, thus creating a suction in this conveying cylinder 1. The motion is subsequently reversed, whereby the piston 2 presses the drawn-in conveying fluid out of the cylinder 1, while suction is generated in the other conveying cylinder 1.
The pumping operation is controlled by suction and pressure valves (not shown).
Unlike in the embodiment described above which has a piston 6 with a front and rear piston rod 5, 12, the embodiment illustrated in FIGS. 3a, 3b and 4 CA 02237612 1998-0~-13 employs two pistons 6, 12 which are coupled together, wherein the first piston 6 with the forward piston rod 5 is disposed in drive cylinder 4 and the second piston 11 with the rear piston rod 12 is disposed in a second cylinder 10. The drive cylinder 4 and the second cylinder 10 are connected to one another via a s second line 7 which can be flexible.
The second cylinder 10 and the drive cylinder 4 have different diameters;
in the illustrated example the second cylinder 10 has a larger diameter than the drive cylinder 4. The difference in diameters provides a "transmission ratio" for o the movements of the piston rods 5, 12. In the present example, the larger diameter of the second cylinder 10 enables shorter strokes of piston 11 and thus smaller eccentricities of the profiled disks 9.
In another embodiment illustrated in FIGS. 5a, 5b and 6, the second cylinders 10 and consequently also the rear piston rods 12 of the pistons 11 are arranged in such a way that a single profiled disk 9 is sufficient to control both piston rods 12.
Referring now to FIGS. 7a to 10b, there are depicted the non-circular mirror-symmetric shape of the profiled disks 9 in accordance with the invention as well as the effect of the shape of the profiled disks 9 on the characteristic v-(p curve. The more pronounced the selected heart shape, (the heart shape is most CA 02237612 1998-0~-13 pronounced in FIG. 7a), i.e. the deeper the indentation 13, the smaller the acceleration angle. At small acceleration angles, the conveying velocity is constant over an extended range even if only one profiled disk 9 is employed.
The desired characteristic curve can now be selected based on the aforedescribed results, and the device can be adapted to the prevailing conditions by exchanging the profiled disks 9.
The profiled disks 9 can be machined, for example with CNC machines capable of providing almost any shape.
Claims (12)
1. A positive displacement pump with at least two drive cylinders, with each of the drive cylinders having moveably disposed therein a piston (6) with a forward piston rod and a rear piston rod (12), wherein the pistons are coupled to each other and wherein the rear piston rods (12) are connected with at least one eccentric control means (9), characterized in that the eccentric control means (9) is provided in the form of a non-circular mirror-symmetric profiled disk (9).
2. The positive displacement pump of claim 1, characterized in that the profiled disk (9) is configured approximately in the shape of a heart.
3. The positive displacement pump of claim 2, characterized in that with a decreasing acceleration angle the indentation (13) characterizing the heart shape is more pronounced.
4. The positive displacement pump of claim 1, characterized in that at least two profiled disks (9) are arranged on one or more shafts (8).
5. The positive displacement pump of claim 1, characterized in that the profiled disk (9) can be replaced.
6. The positive displacement pump of claim 1, characterized in that the pistons are coupled with each other through a line (3) disposed between the drive cylinders (4) and through an essentially incompressible fluid disposed in the region between the pistons (6).
7. The positive displacement pump of claim 1, characterized in that the pistons (6) with a forward and rear piston rod (5, 12), are each substituted by a piston (6) with forward piston rod (5) and another piston (11) which is coupled to the piston (6) and has a rear piston rod (12).
8. The positive displacement pump of claim 7, characterized in that each of the pistons (6) is disposed in a drive cylinder (4) and the additional piston (11) is disposed in an additional cylinder (10), wherein both cylinders (4, 10) have different diameters.
9. The positive displacement pump of claim 7, characterized in that the piston (6) is mechanically coupled to the additional piston (11).
10. The positive displacement pump of claim 7, characterized in that the piston (6) and the additional piston (11) are hydraulically coupled to one another through an additional line (7) disposed between the drive cylinder(4) and the additional cylinder (10) and through an essentially incompressible fluid disposed in the region between the piston and the additional piston (67 11).
11. The positive displacement pump of claim 6 or claim 10, characterized in that the incompressible fluid is a rocking oil.
12. The positive displacement pump of claim 6 or claim 10, characterized in that the first line and the additional line (3, 7) are made of a flexible material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19542461 | 1995-11-14 | ||
| DE19542461.1 | 1995-11-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2237612A1 true CA2237612A1 (en) | 1997-05-22 |
Family
ID=7777450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2237612 Abandoned CA2237612A1 (en) | 1995-11-14 | 1996-08-29 | Device with at least two drive cylinders |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0861374A1 (en) |
| JP (1) | JP2000500205A (en) |
| CA (1) | CA2237612A1 (en) |
| WO (1) | WO1997018394A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8152476B2 (en) | 2007-08-24 | 2012-04-10 | Toyo Pumps North America Corp. | Positive displacement pump with a working fluid and linear motor control |
| US9850889B2 (en) | 2010-02-02 | 2017-12-26 | Dajustco Ip Holdings Inc. | Hydraulic fluid control system for a diaphragm pump |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10232513B4 (en) * | 2002-07-18 | 2014-02-06 | Linde Hydraulics Gmbh & Co. Kg | Pulsation-optimized hydrostatic displacement machine, in particular axial or radial piston machine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB509039A (en) * | 1938-10-31 | 1939-07-11 | Cromwell Hanford Varley | Improvements relating to reciprocating pumps |
| US3230887A (en) * | 1962-10-29 | 1966-01-25 | Beckman Instruments Inc | Even flow apparatus and method for fluid gradient engines and the like |
| DE2608664A1 (en) * | 1976-03-03 | 1977-09-08 | Niepmann Ag Walchwil | DEVICE FOR GENERATING A UNIFORM CONVEYOR FLOW |
| US4067666A (en) * | 1976-07-19 | 1978-01-10 | Whiteman Manufacturing Company | Concrete pumping apparatus |
| GB8417539D0 (en) * | 1984-07-10 | 1984-08-15 | Dale Mansfield Ltd | Pumping arrangements |
| SU1564380A1 (en) * | 1988-02-23 | 1990-05-15 | Производственное объединение "Уралмаш" | Piston pump |
| SU1707226A1 (en) * | 1989-10-11 | 1992-01-23 | Полтавский инженерно-строительный институт | Mortar pump |
-
1996
- 1996-08-29 CA CA 2237612 patent/CA2237612A1/en not_active Abandoned
- 1996-08-29 WO PCT/DE1996/001604 patent/WO1997018394A1/en not_active Application Discontinuation
- 1996-08-29 JP JP9518487A patent/JP2000500205A/en active Pending
- 1996-08-29 EP EP96934394A patent/EP0861374A1/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8152476B2 (en) | 2007-08-24 | 2012-04-10 | Toyo Pumps North America Corp. | Positive displacement pump with a working fluid and linear motor control |
| US9850889B2 (en) | 2010-02-02 | 2017-12-26 | Dajustco Ip Holdings Inc. | Hydraulic fluid control system for a diaphragm pump |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997018394A1 (en) | 1997-05-22 |
| EP0861374A1 (en) | 1998-09-02 |
| JP2000500205A (en) | 2000-01-11 |
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