WO1997018394A1 - Vorrichtung mit mindestens zwei antriebszylindern - Google Patents
Vorrichtung mit mindestens zwei antriebszylindern Download PDFInfo
- Publication number
- WO1997018394A1 WO1997018394A1 PCT/DE1996/001604 DE9601604W WO9718394A1 WO 1997018394 A1 WO1997018394 A1 WO 1997018394A1 DE 9601604 W DE9601604 W DE 9601604W WO 9718394 A1 WO9718394 A1 WO 9718394A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston
- pistons
- cylinder
- cylinders
- piston rod
- Prior art date
Links
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
Definitions
- the invention relates to a device with at least two drive cylinders, in each of which a first piston with a front piston rod is movably arranged and wherein the first pistons are coupled to one another, the first pistons have a rear piston rod and the rear piston rods are connected to at least one eccentric control means.
- Devices of this type are required in many areas of technology in order to achieve a uniform force-transmitting back and forth movement between two or more cylinder pistons.
- the use of a hydraulic drive is advantageous in that long piston strokes improve the valve kinetics, the displacement kinematics can be designed in such a way that low-pulsation delivery is possible and it is not necessary for the hydraulic unit to form a unit with the pump, that is, it is "unreliable” can be used.
- the hydraulic units which usually consist of a high-pressure pump, a complicated electrohydraulic circuit, as well as cooling, filters and pipes, are expensive.
- DE-A-34 46 107 describes two pistons which are connected to one another by a fluid column and which can have different diameters in order to achieve a force transmission.
- a device with several drive cylinders in each of which a first piston with a front piston rod is movably arranged and the first pistons are coupled to one another by a line . It is also provided there that the first pistons each have a rear piston side which is connected to a control eccentric. Three control eccentrics arranged side by side are arranged on a shaft, which is one Requires pressure source for pulsation compensation. In this device, the speed profiles are also determined by the mechanical design of the control eccentrics and are not adaptable.
- the object of the invention is to develop a device according to the preamble, in which the characteristic varies slightly and can therefore be adapted to the respective requirements.
- this device it should be possible with this device to also achieve non-sinusoidal characteristic curves.
- This object is achieved in that a non-circular, mirror-symmetrical profile disk is provided as the eccentric control means.
- profiled disks allow the characteristic curves to be varied, for example when using the devices in pumps is an advantage.
- a conventional characteristic curve can be achieved. For example, by using profile disks that have a non-sinusoidal characteristic curve, the efficiency can be a pump can be increased considerably and a constant delivery speed and fast opening and closing speeds of the valves can be achieved.
- Another advantage of the invention is that no pressure compensation or constant pressurization of the pistons is required.
- An embodiment of the invention is that the profiled disc is approximately heart-shaped.
- the incision characterizing the heart shape becomes more pronounced as the acceleration angle decreases.
- An embodiment of the invention provides that the first pistons are hydraulically coupled via a line arranged between the drive cylinders and an essentially incompressible liquid arranged in the area between the first pistons.
- a first piston with front piston rod and a second piston coupled therewith with rear piston rod are present.
- the first piston is arranged in a drive cylinder
- the second piston is arranged in a second cylinder and both cylinders have different diameters.
- the different diameters of the two cylinders result in a gear ratio that can make it possible, for example, to work with a small eccentric stroke.
- first piston and the second piston may be mechanically coupled.
- first piston and the second piston are hydraulically coupled via a second line arranged between the drive cylinder and the second cylinder and an essentially incompressible liquid arranged in the area between the first and the second piston.
- the incompressible liquid is a rocking oil.
- first and the second line consist of flexible material.
- This measure can be an advantage when space is limited.
- the invention provides for the use of the device for driving positive displacement pumps with at least two cylinders.
- Fig. Lb two views of a device according to the invention with two on one
- FIG. 2 is a perspective view of the device of FIG. La and lb,
- FIG. 3b two views of a device according to the invention with two on one
- FIGS. 3a and 3b shows a perspective illustration of the device according to FIGS. 3a and 3b
- 5b shows two views of a device according to the invention
- the piston rods are actuated by a profiled disc
- FIGS. 5a and 5b are perspective views of the device according to FIGS. 5a and 5b.
- 10b shows a profiled disk with associated v- ⁇ characteristic, the acceleration angle being 60 °.
- FIGS. 1 a and 1 b which is used in all examples in a piston pump with two delivery cylinders 1, two profiled disks 9 are arranged on a shaft 8 offset by 180 °.
- Each profile plate 9 actuates a rear piston rod 12, each of which is connected to a piston 6 running in a drive cylinder 4.
- the pistons 6 each also have a front piston rod 5, which in turn is each connected to a piston 2 running in a delivery cylinder 1.
- the two pistons 6 are coupled to one another, in the example shown this coupling takes place via a line 3 between the drive cylinders 4 and an essentially incompressible liquid, a so-called rocking oil, which is arranged in the area between the two pistons 6.
- non-sinusoidal movements of the pistons 6 and 2 are also possible due to the flexible shape of the profile disks 9.
- the drive of the profiled disks 9 takes place in a correct manner, for example via an electric motor.
- the device works as follows:
- a profiled disk 9 moves a piston 6 into one of the drive cylinders 4 via a piston rod 12.
- rocking oil is displaced from one drive cylinder 4 via line 3 into the other drive cylinder 4.
- the piston 6 arranged in this with the piston rod 12 thereby moves towards the upper end of the drive cylinder 4.
- the piston 2 is likewise moved toward the upper end in the corresponding delivery cylinder 1 and a suction process is implemented in this delivery cylinder 1.
- there is a reverse movement and the suctioned delivery fluid is pushed out of the cylinder 1 by the piston 2, while a suction process is realized in the other delivery cylinder 1.
- the pumping process is controlled by suction and pressure valves, not shown.
- FIG. 3a, 3b and 4 another embodiment of the invention is shown, which differs in particular from the one described above in that instead of a piston 6 with front and rear piston rods 5, 12, two pistons 6, 11 coupled to one another are present, whereby the first piston 6 with the front piston rod 5 in the drive cylinder 4 and the second piston 11 with the rear piston rod 12 is arranged in a second cylinder 10.
- the drive cylinder 4 and the second cylinder 10 are connected to one another by a second line 7, which can be flexible.
- the second cylinder 10 and the drive cylinder 4 have different diameters, the second cylinder 10 having a larger diameter than the drive cylinder 4 in the example shown. This difference in diameter results in a "transmission ratio" of the movements of the piston rods 5, 12.
- the larger diameter of the second cylinders 10 enables shorter strokes of the pistons 11 and thus lower eccentricities of the profiled disks 9.
- the second cylinders 10 and thus the rear piston rods 12 of the pistons 11 are arranged in such a way that a single profiled disc 9 is sufficient for controlling both piston rods 12.
- the characteristic curve required in each case can be selected in a targeted manner and the device can be adapted to the respective circumstances by exchanging the profiled disks 9.
- the profile disks 9 can be manufactured, for example, with CNC machines, which allows almost fix shapes.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9518487A JP2000500205A (ja) | 1995-11-14 | 1996-08-29 | 少なくとも2つの駆動シリンダを備えた装置 |
EP96934394A EP0861374A1 (de) | 1995-11-14 | 1996-08-29 | Vorrichtung mit mindestens zwei antriebszylindern |
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 |
---|---|
WO1997018394A1 true WO1997018394A1 (de) | 1997-05-22 |
Family
ID=7777450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/001604 WO1997018394A1 (de) | 1995-11-14 | 1996-08-29 | Vorrichtung mit mindestens zwei antriebszylindern |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0861374A1 (de) |
JP (1) | JP2000500205A (de) |
CA (1) | CA2237612A1 (de) |
WO (1) | WO1997018394A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2845429A1 (fr) * | 2002-07-18 | 2004-04-09 | Linde Ag | Machine volumetrique hydrostatique optimise vis-a-vis des pulsations |
Families Citing this family (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 |
CA2730696C (en) | 2010-02-02 | 2018-09-18 | Peter Van De Velde | Hydraulic fluid control system for a diaphragm pump |
Citations (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 (de) * | 1976-03-03 | 1977-09-08 | Niepmann Ag Walchwil | Vorrichtung zur erzeugung eines gleichfoermigen foerderstromes |
US4067666A (en) * | 1976-07-19 | 1978-01-10 | Whiteman Manufacturing Company | Concrete pumping apparatus |
EP0169655A1 (de) * | 1984-07-10 | 1986-01-29 | Dale (Mansfield) Limited | Pumpanlage |
SU1564380A1 (ru) * | 1988-02-23 | 1990-05-15 | Производственное объединение "Уралмаш" | Поршневой насос |
SU1707226A1 (ru) * | 1989-10-11 | 1992-01-23 | Полтавский инженерно-строительный институт | Растворонасос |
-
1996
- 1996-08-29 JP JP9518487A patent/JP2000500205A/ja active Pending
- 1996-08-29 EP EP96934394A patent/EP0861374A1/de not_active Withdrawn
- 1996-08-29 WO PCT/DE1996/001604 patent/WO1997018394A1/de not_active Application Discontinuation
- 1996-08-29 CA CA 2237612 patent/CA2237612A1/en not_active Abandoned
Patent Citations (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 (de) * | 1976-03-03 | 1977-09-08 | Niepmann Ag Walchwil | Vorrichtung zur erzeugung eines gleichfoermigen foerderstromes |
US4067666A (en) * | 1976-07-19 | 1978-01-10 | Whiteman Manufacturing Company | Concrete pumping apparatus |
EP0169655A1 (de) * | 1984-07-10 | 1986-01-29 | Dale (Mansfield) Limited | Pumpanlage |
SU1564380A1 (ru) * | 1988-02-23 | 1990-05-15 | Производственное объединение "Уралмаш" | Поршневой насос |
SU1707226A1 (ru) * | 1989-10-11 | 1992-01-23 | Полтавский инженерно-строительный институт | Растворонасос |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Week 9114, Derwent World Patents Index; AN 91-100284, XP002027642 * |
DATABASE WPI Week 9248, Derwent World Patents Index; AN 92-397191, XP002027641 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2845429A1 (fr) * | 2002-07-18 | 2004-04-09 | Linde Ag | Machine volumetrique hydrostatique optimise vis-a-vis des pulsations |
Also Published As
Publication number | Publication date |
---|---|
JP2000500205A (ja) | 2000-01-11 |
CA2237612A1 (en) | 1997-05-22 |
EP0861374A1 (de) | 1998-09-02 |
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