EP0491809A1 - Radialkolbenpumpe. - Google Patents
Radialkolbenpumpe.Info
- Publication number
- EP0491809A1 EP0491809A1 EP90914061A EP90914061A EP0491809A1 EP 0491809 A1 EP0491809 A1 EP 0491809A1 EP 90914061 A EP90914061 A EP 90914061A EP 90914061 A EP90914061 A EP 90914061A EP 0491809 A1 EP0491809 A1 EP 0491809A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- piston
- pressure
- cylinder
- valve
- 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
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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/06—Control
-
- 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
- F04B7/00—Piston machines or pumps characterised by having positively-driven valving
- F04B7/0076—Piston machines or pumps characterised by having positively-driven valving the members being actuated by electro-magnetic means
Definitions
- the invention relates to a radial piston pump with a plurality of radially arranged cylinder piston arrangements with suction and pressure valves, the piston of which is controlled by an eccentric disk which rotates eccentrically with respect to a housing holding the cylinders.
- Such devices have a very complicated structure.
- the problem also arises that the control of such a radial piston pump is mostly digital, but these pumps have an analog behavior. It is therefore necessary to detect the position of the control device assigned to certain partial loads and to reproduce it as accurately as possible, but there is the problem that the positions of the control device corresponding to certain partial flow rates change with the delivery pressure.
- Another problem also lies in the fact that for many applications of such radial piston pumps a very fine gradation of the partial delivery quantities of e.g. in the size of 2 to 3% of the maximum amount conveyed is required.
- the aim of the invention is to propose a radial piston pump of the type mentioned at the outset, which is characterized by a simple construction and is suitable for direct digital control for regulating the delivery rate.
- Individual cylinders could also be shut down by keeping a permanent connection between the suction side of the pump and the pressure side of a piston open. In this case, however, this cylinder would not contribute to the pressure build-up in the pressure line, and when a larger number of cylinders are shut down, there are correspondingly long pauses between the individual pressure surges, which are usually undesirable for the operation of such pumps connected downstream .
- controllable valve is arranged in a pressure valve on ⁇ , wherein the valve body hollow and is provided with an opening facing the cylinder, which is controlled by a displaceably held control piston which can be controlled independently of the pressure conditions in the associated cylinder.
- FIG. 1 shows a section through a radial piston pump according to the invention
- FIG. 2 shows an end view of a radial piston pump according to the invention
- FIG. 3 shows a section through a cylinder piston arrangement of a radial piston pump according to the invention on an enlarged scale.
- the radial piston pump has a housing 1, in which a shaft 2 is rotatably mounted in inclined roller bearings 4, which has an eccentric disk 3 arranged eccentrically with respect to the central axis of the shaft 2. On this eccentric disc 3, a ring 6 is supported via a roller bearing 5, in which the pistons 7 are held via ball heads 8.
- the pistons 7 slide in cylinders 9 which are held in the housing 1 and have openings 10 in their end region facing the shaft 1, which openings 10 connect the interior of the piston 7 with the interior 11 of the pump which is connected to the suction side of the pump sealed housing 1 connects.
- a suction valve 13 On the end face 12 of the cylinder 9 facing the face of the piston 7, a suction valve 13 is arranged, which is designed as a poppet valve, the valve plate 14 is designed as a mass part and by the spring 15 and the valve rod 16 and the spring plate 17 against the closing position is biased.
- the cylinder spaces are 'connected via arranged in the end walls of the cylinder 9 with the pressure valves 18 Druckleitun ⁇ gen 19th
- the pressure valves 18 are controllable, for which purpose a magnet (not shown) is provided.
- the pressure valve 18 has a hollow valve body 20, in which a control piston 21 is slidably held, which controls the opening 22 of the valve body 20.
- the valve body 20 is biased against the closed position by means of a relatively weak spring 23.
- the control piston 21 is guided in the core 24 of the magnet (not shown) and is biased against the closed position by means of a relatively strong spring 25.
- valve body 20 is held in the closed position by the two springs 23, 25, whereby penetration of pressure fluid into the interior of the valve body 20 is prevented.
- the cylinders 9 and the pistons 7 of the pump have different diameters. This means that by switching individual cylinders or several cylinders 9 on and off by opening the connection between the interior of the cylinders and the pressure line 19, the delivery capacity of the pump can be varied. For example, in the example shown with five cylinders 9 (FIG. 2) there are 24 different power levels, or 48 power levels with seven cylinders. By correspondingly coordinating the diameters of the individual cylinders and correspondingly controlling their control pistons 21 for producing and preventing a connection between the pressure line 19 and the interior of the cylinder 9, gradations of the delivery capacity with seven cylinders from about 2% to 2% of the full power of the pump are possible.
- Switching off the cylinders and / or preventing their effectiveness by opening the pressure valve 18 also has the advantage that the pulsation of the delivery volume remains the same as when the delivery rate is full, that is to say when all of the pressure valves 18 are closed. Only the amplitude of the pulsation changes, the smaller the more pressure valves 18 are opened. This facilitates the use of such a pump for applications in which a digital control of the delivery capacity of the pump is provided, since in this case only the corresponding pressure valves 18 have to be actuated, with a very fine-tuned Leis ⁇ with a correspondingly large number of cylinders control is possible.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Details Of Reciprocating Pumps (AREA)
- Compressor (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0217589A AT394892B (de) | 1989-09-18 | 1989-09-18 | Radialkolbenpumpe |
AT2175/89 | 1989-09-18 | ||
PCT/AT1990/000093 WO1991004414A1 (de) | 1989-09-18 | 1990-09-18 | Radialkolbenpumpe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0491809A1 true EP0491809A1 (de) | 1992-07-01 |
EP0491809B1 EP0491809B1 (de) | 1994-02-02 |
Family
ID=3529334
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90914061A Expired - Lifetime EP0491809B1 (de) | 1989-09-18 | 1990-09-18 | Radialkolbenpumpe |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0491809B1 (de) |
JP (1) | JPH05500254A (de) |
AT (2) | AT394892B (de) |
DE (1) | DE59004529D1 (de) |
WO (1) | WO1991004414A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6183207B1 (en) * | 1998-05-18 | 2001-02-06 | Sturman Industries, Inc. | Digital pump |
DE10252622A1 (de) * | 2002-11-11 | 2004-05-27 | Continental Teves Ag & Co. Ohg | Motor-Pumpen-Aggregat |
DE10356373A1 (de) | 2003-12-03 | 2005-07-07 | Obrist Engineering Gmbh | Hubkolbenmaschine |
CN102900470A (zh) * | 2011-07-25 | 2013-01-30 | 祁喜林 | 星形发动机 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR344422A (fr) * | 1904-07-02 | 1904-11-04 | Jean Bayard Fils Aine | Régulateur de débit automatique pour tous systèmes de pompes mues au moteur |
DE375514C (de) * | 1920-09-19 | 1923-08-23 | Giulio Silvestri | Verfahren und Einrichtung zur stufenweisen AEnderung der Lieferung von Mehrzylinder-Kolbenpumpen |
US2346987A (en) * | 1940-11-09 | 1944-04-18 | Honeywell Regulator Co | Variable capacity compressor |
CH258404A (de) * | 1945-11-22 | 1948-11-30 | Wirz Ernst | Hydraulische Regeleinrichtung an Mehrfach-Kolbenpumpen. |
US5058553A (en) * | 1988-11-24 | 1991-10-22 | Nippondenso Co., Ltd. | Variable-discharge high pressure pump |
-
1989
- 1989-09-18 AT AT0217589A patent/AT394892B/de not_active IP Right Cessation
-
1990
- 1990-09-18 DE DE90914061T patent/DE59004529D1/de not_active Expired - Fee Related
- 1990-09-18 WO PCT/AT1990/000093 patent/WO1991004414A1/de active IP Right Grant
- 1990-09-18 EP EP90914061A patent/EP0491809B1/de not_active Expired - Lifetime
- 1990-09-18 JP JP2513107A patent/JPH05500254A/ja active Pending
- 1990-09-18 AT AT90914061T patent/ATE101241T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9104414A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1991004414A1 (de) | 1991-04-04 |
ATA217589A (de) | 1991-12-15 |
ATE101241T1 (de) | 1994-02-15 |
AT394892B (de) | 1992-07-10 |
DE59004529D1 (de) | 1994-03-17 |
JPH05500254A (ja) | 1993-01-21 |
EP0491809B1 (de) | 1994-02-02 |
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Legal Events
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