WO2006019341A1 - Dispositif pour generer et pour maintenir une pression/ecoulement voulu - Google Patents

Dispositif pour generer et pour maintenir une pression/ecoulement voulu Download PDF

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Publication number
WO2006019341A1
WO2006019341A1 PCT/SE2004/001318 SE2004001318W WO2006019341A1 WO 2006019341 A1 WO2006019341 A1 WO 2006019341A1 SE 2004001318 W SE2004001318 W SE 2004001318W WO 2006019341 A1 WO2006019341 A1 WO 2006019341A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
cylinders
pressure
conduit system
flow
Prior art date
Application number
PCT/SE2004/001318
Other languages
English (en)
Inventor
Knut Meyer
Original Assignee
Lagafors Fabriks Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lagafors Fabriks Ab filed Critical Lagafors Fabriks Ab
Priority to EP04775422A priority Critical patent/EP1664618B1/fr
Priority to DE602004019113T priority patent/DE602004019113D1/de
Publication of WO2006019341A1 publication Critical patent/WO2006019341A1/fr

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
    • 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
    • F04B9/1172—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 pump piston in the two directions being obtained by a double-acting piston liquid motor
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/09—Flow through the pump

Definitions

  • the present invention relates to an apparatus for generating and maintaining a desired pressure/flow in a water conduit system with a number of take-off points for connection of closable and openable high pressure water nozzles for use in high pressure water spraying, for example cleaning.
  • low pressure systems are preferred in a fixed installation which is placed in a separate facility or a so-called pumping centre which comprises a plurality of pumps and from which extends a conduit system out to the different washing stations or take-off points out in different premises. All users are connected to the same conduit system and are required to use the same water pressure.
  • the control system included in the existing installations uses the water pressure as a control signal.
  • the nozzles are dimensioned so as to give the predetermined system pressure at the flow from one pump, which implies that the system constantly uses one pump per user.
  • the control system is operative to select at random a pump which is to start in the event of a pressure drop with a view to distributing wear on the pumps as evenly as possible.
  • a pump which is to start in the event of a pressure drop with a view to distributing wear on the pumps as evenly as possible.
  • use is essentially made only of electrically driven piston pumps of the plunger type.
  • the relatively small cylinders used in such pumps require high speeds and many strokes per minute, which results in considerable wear.
  • the degree of efficiency of the prior art pumps is further closely adapted to a specific pressure/flow combination, for which reason the application of so-called speed regulation gives a limited effect. This is moreover a major inconvenience.
  • the task forming the basis of the present invention is to realise a pump capable of delivering pressure/flows of 80 to 100 bar/17 to 20 1/min with a good margin.
  • the pressure/flow should be regulated, which implies a pump which within given performance parameters permits, without any deterioration in efficiency, a higher flow compensated by lower pressure or conversely higher pressure compensated by lower flow.
  • the present invention has for its object to make for a system which rapidly compensates for pressure/flow variations in the water conduit.
  • the pressure at a take-off point should not fall appreciably when another take-off point in the system is opened. Further, the pressure at one take-off point should not be increased appreciably because of another take-off point in the system being closed.
  • the present invention relates to an apparatus for generating and maintaining a desired pressure/flow in a water conduit system with a number of take-off points for connection of closable and openable high pressure water nozzles for use in high pressure water spraying, for example cleaning.
  • low pressure systems are preferred in a fixed installation which is placed in a separate facility or a so-called pumping centre which comprises a plurality of pumps and from which extends a conduit system out to the different washing stations or take-off points out in different premises.
  • AU users are connected to the same conduit system and are required to use the same water pressure.
  • the control system included in the existing installations uses the water pressure as a control signal.
  • the nozzles are dimensioned so as to give the predetermined system pressure at the flow from one pump, which implies that the system constantly uses one pump per user.
  • the control system is operative to select at random a pump which is to start in the event of a pressure drop with a view to distributing wear on the pumps as evenly as possible.
  • a pump which is to start in the event of a pressure drop with a view to distributing wear on the pumps as evenly as possible.
  • use is essentially made only of electrically driven piston pumps of the plunger type.
  • the relatively small cylinders used in such pumps require high speeds and many strokes per minute, which results in considerable wear.
  • the degree of efficiency of the prior art pumps is further closely adapted to a specific pressure/flow combination, for which reason the application of so-called speed regulation gives a limited effect. This is moreover a major inconvenience.
  • the task forming the basis of the present invention is to realise a pump capable of delivering pressure/flows of 80 to 100 bar/17 to 20 1/min with a good margin.
  • the pressure/flow should be regulated, which implies a pump which within given performance parameters permits, without any deterioration in efficiency, a higher flow compensated by lower pressure or conversely higher pressure compensated by lower flow.
  • the present invention has for its object to make for a system which rapidly compensates for pressure/flow variations in the water conduit.
  • the pressure at a take-off point should not fall appreciably when another take-off point in the system is opened. Further, the pressure at one take-off point should not be increased appreciably because of another take-off point in the system being closed.
  • the water conduit system is connected to at least two water cylinders each with its piston for feeding high pressure water in the water conduit system, and the pistons are connected to a drive unit for driving the pistons in the water cylinders for generating and maintaining a predetermined water pressure in the water conduit system.
  • the drive unit is a hydraulic assembly with a drive cylinder for each water cylinder.
  • the drive cylinders are single-action.
  • the single-action drive cylinders are provided with a return conduit with a dump valve.
  • the drive cylinders are double-action.
  • the water cylinders are connected to the water conduit system via valves for discharging high pressure water in the water conduit system and for the admission of incoming water.
  • the valves for incoming water are arranged to fill the water cylinders with incoming water and thereby return the pistons therein to their starting position with the cylinders filled.
  • the water cylinders are positioned in line with each of their drive cylinders.
  • the water cylinders and drive cylinders are disposed in parallel with each other with the water cylinders straight above the drive cylinders.
  • an apparatus for generating high pressure water in a water conduit system with a number of take-off points which, in principle, will be totally independent of one another as regards both water flow and water pressure as well as in respect of pressure reduction on opening of a plurality of take-off points and pressure elevation on closing of a number of take-off points while one is open.
  • the apparatus according to the invention can be driven with a hydraulic assembly, this results in considerably better service life.
  • Hydraulic oil is an optimum fluid to be pumped at high pressure.
  • it is a lubricant and is slightly compressible, which gives extremely favourable conditions with long service intervals.
  • the use of hydraulic pumps makes for a considerably greater pressure/flow range with a high degree of efficiency, since the hydraulic oil permits the use of more sophisticated pumps, for example an angle disk pump with a pressure compensated strong length.
  • the angle disk pump operates at a predetermined pressure of the oil and compensates for flow variations in fractions of a second by changing the angle and thereby the stroke length.
  • the cylinder unit is considered as a fixed switch between oil and water, which implies that the water pressure under any circumstances has the same ratio to the oil pressure.
  • An apparatus according to the present invention will have an extremely long service life and requires minimal service.
  • Major advantages reside essentially in the fact that users sense only very slight water hammers or jolts when other users open or close a nozzle, and in the fact that the pump may be regulated with respect to pressure/flow, that the construction will be more robust than traditional plunger pumps, with longer service intervals as a result, and that the pump reduces pressure drop and pressure hammers in the system to hardly noticeable pulses in the system.
  • the apparatus according to the present invention there will further be realised a perfect and endurable barrier against the penetration of impurities into the water system.
  • Fig. 1 shows a diagram of an apparatus according to one embodiment of the present invention.
  • Fig. 2 is a perspective view of a prototype of the embodiment of fig. 1.
  • Fig. 3 is a front elevation of a part of the apparatus of fig. 2.
  • Fig. 4 shows a part from above of the apparatus of fig. 2.
  • Fig. 5 is a front elevation of the apparatus of fig. 2.
  • Fig. 6A is a view of a single-action cylinder unit according to the present invention.
  • Fig. 6B is a side elevation of the cylinder unit shown in Fig. 6A.
  • Fig. 7 shows a hydraulic diagram for the unit illustrated in fig. 6A and 6B.
  • Fig. 1 shows a diagram of an apparatus according to one embodiment of the present invention.
  • Fig. 2 is a perspective view of a prototype of the embodiment of fig. 1.
  • Fig. 3 is a front elevation of a part of the apparatus of fig. 2.
  • FIG. 8 is a longitudinal section through a cylinder unit of double-action type for an embodiment of the apparatus according to the present invention.
  • Fig. 9 shows a similar longitudinal section to fig. 8 with the piston in its opposing position.
  • Fig. 10 shows a hydraulic diagram for an apparatus of the type illustrated in figs. 8 and 9.
  • the water conduit system in Fig. 1 carries reference numeral 1.
  • the water conduit system 1 is supplied with incoming water via a faucet 2.
  • a non-return valve 5 is disposed between the water conduit system 1 and the faucet.
  • a safety valve 6 is further connected to the water conduit system 1 and relieves the pressure in the water conduit system 1 if the pressure exceeds a predetermined level, e.g. 10 bar.
  • the water cylinder 3 is connected to the water conduit system 1 via two non-return valves 7 and 8, while the water cylinder 4 is connected to the water conduit system 1 via two non-return valves 9 and 10.
  • the non-return valves 7 and 8 serve to admit incoming water into the water cylinders 3 and 4, while the non ⁇ return valves 8 and 9 serve for releasing high pressure water into the water conduit 1 from the water cylinders 3 and 4.
  • the water cylinders 3 and 4 each have a plunger or piston 11 and 12.
  • the piston 11 is in communication with a piston 13 in a hydraulic cylinder 14 via a rod 15.
  • the piston 12 in the water cylinder 4 is in communication with a piston 16 in a hydraulic cylinder 17 via a rod 18.
  • the hydraulic cylinders 14 and 17 are single-action and are supplied with driving hydraulic fluid from a hydraulic oil unit 19 via a valve 20.
  • the single-action hydraulic cylinders 14, 16 may be provided with a return conduit R which includes a dump valve, whereby the dependence on the water pressure is reduced.
  • the hydraulic oil unit 19 has a pressure-regulating pump with the possibility of manual adjustment of the maximum pressure. Suitable values may be a pressure of 220 bar and a flow of 25 1/min.
  • a pressure sensor is further connected to the water conduit system 1.
  • a water flow sensor 22 of, for example, the Hall effect type.
  • a position sensor 23 of the photo-diode type and the water cylinder 4 is provided with a position sensor 24 of the photo-diode type.
  • the pistons 11 and 12 each have a plate 25 and 26, respectively, for breaking the light communication in the photo-diode sensors 23, 24.
  • the photo-diode sensors or photodetectors 23 and 24 emit a signal as soon as the light is broken by means of the plates 25 and 26 at the latest approx. 200 msec before each respective water cylinder 3, 4 is emptied.
  • the light beam is broken, this implies that each respective water cylinder 3, 4 is almost empty and that it is time to start the second water cylinder.
  • the photodetectors 23, 24 are not broken, this implies that the water cylinder 3, 4 is not empty and can deliver high pressure water.
  • the apparatus according to the present invention illustrated in fig. 1 operates in substantially the following manner. When the water cylinder 3 is almost empty, the plate 25 breaks the signal from the photodiode 23 and activates the direction valve 20.
  • the pressure valve 21 is activated when the flow detector 22 shows "flow”.
  • the main motor in the hydraulic oil unit 19 is shut off when the pressure valve 21 has been open for approx. 5 minutes.
  • the main motor is restarted when the flow detector 22 shows "flow”.
  • the apparatus is suitably provided with a level gauge for low oil volume and for high oil temperature. An indicator light on the regulator unit shows "error" and the main motor is stopped in the event of too low oil level or too high oil temperature.
  • the shortest period of time which the direction valve 20 is activated should not be shorter than 1.3 seconds. If one of the photodetectors' 23, 24 light beam is broken for a briefer period of time once the second photodetector has been broken, switching of the valve 20 is delayed for 1.3 seconds instead of, as in normal operational conditions, immediately implementing the valve switch.
  • Figs. 6A and 6B show the hydraulic cylinders 14 and 17 and fig. 7 shows a hydraulic diagram for the hydraulic cylinders 14 and 17.
  • Fig. 2 shows a photographic, perspective view of a prototype of an apparatus according to the present invention, while drawing figs. 3-5 show views of parts of the apparatus shown in fig. 2. The parts shown in these figures have the same reference numerals as in fig. 1.
  • Figs. 8 and 9 show a water cylinder 3, 4 with a double-action hydraulic piston 27.
  • Fig. 8 shows the hydraulic piston in its lower position, with the water cylinders 3, 4 filled with water, while fig. 9 shows the hydraulic piston in its upper position with the water cylinder in its upper position and emptied.
  • the major difference between the unit shown in figs. 8 and 9 and the unit described above is that the hydraulic piston 15, 18 is of double-action type.
  • the piston 13, 16 is moved from its lower position illustrated in fig. 8 to its upper position with hydraulic oil which is fed in to the inlet 28 and from the upper position in fig. 9 to the lower position in fig. 8 by means of hydraulic oil which is fed through the inlet 29.
  • Fig. 10 shows a hydraulic diagram for operation of the double-action hydraulic cylinders 27 shown in figs. 8 and 9.
  • the function of an apparatus with the double-action cylinders 27 will be substantially the same as the single-action cylinders. It should be observed that, regardless of whether the hydraulic cylinders are single-action or double-action, the water cylinders 3, 4 are single-action.
  • incoming water should, as was mentioned previously, return the pistons 11, 12.
  • the pressure of the incoming water is approx. 2.7 bar for attaining sufficiently high return speed so as to have time at maximum flow of 50 1/min.
  • incoming water pressure in a factory can fall to practically 0 bar when the water take-off is at its greatest and is seldom much higher than 2 bar.
  • the problem may eventually be remedied with the aid of a so-called dumping function on the return oil. This implies that the flow resistance on the return oil will be lower and thereby the pressure of the incoming water need not be so high.
  • the problem with exclusively single-action cylinders is essentially solved with the aid of double-action cylinders according to figs. 8, 9 and 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Liquid Developers In Electrophotography (AREA)
  • Printing Methods (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un appareil pour générer et pour maintenir une pression/écoulement voulu dans un système de conduits d'eau (1) présentant un certain nombre de points d'approvisionnement pour un raccordement d'ajutages d'eau sous haute pression fermables et ouvrables à utiliser pour une pulvérisation d'eau sous haute pression, par exemple, pour effectuer un nettoyage. Le système de conduits d'eau (1) est raccordé à au moins deux cylindres d'eau (3, 4), chaque cylindre présentant son piston (11, 12) pour une amenée d'eau sous haute pression dans le système de conduits d'eau (1), et les pistons (11, 12) sont reliés à une unité d'entraînement (19, 20) destinée à entraîner les pistons (11, 12) dans les cylindres (3, 4) pour générer et pour maintenir une pression d'eau prédéterminée dans le système de conduits d'eau (1).
PCT/SE2004/001318 2003-09-16 2004-09-14 Dispositif pour generer et pour maintenir une pression/ecoulement voulu WO2006019341A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04775422A EP1664618B1 (fr) 2003-09-16 2004-09-14 Dispositif pour generer et pour maintenir une pression/ecoulement voulu
DE602004019113T DE602004019113D1 (de) 2003-09-16 2004-09-14 Vorrichtung zum erzeugen und aufrechterhalten eines gewünschten drucks/stroms

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0302470A SE526018C2 (sv) 2003-09-16 2003-09-16 Anordning för alstring och upprätthållande av ett önskat tryck/flöde
SE0302470-0 2003-09-16

Publications (1)

Publication Number Publication Date
WO2006019341A1 true WO2006019341A1 (fr) 2006-02-23

Family

ID=29212477

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2004/001318 WO2006019341A1 (fr) 2003-09-16 2004-09-14 Dispositif pour generer et pour maintenir une pression/ecoulement voulu

Country Status (5)

Country Link
EP (1) EP1664618B1 (fr)
AT (1) ATE421069T1 (fr)
DE (1) DE602004019113D1 (fr)
SE (1) SE526018C2 (fr)
WO (1) WO2006019341A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102230573A (zh) * 2011-05-13 2011-11-02 潘健 液体活塞式气体处理装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4597406A (en) * 1983-04-11 1986-07-01 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Device for supplying a pipe with a fluid at a particular pressure from alternative sources
US5832948A (en) * 1996-12-20 1998-11-10 Chemand Corp. Liquid transfer system
US6234759B1 (en) * 1998-07-16 2001-05-22 Ewald Hennel Method for regulating a fluid pressure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4597406A (en) * 1983-04-11 1986-07-01 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Device for supplying a pipe with a fluid at a particular pressure from alternative sources
US5832948A (en) * 1996-12-20 1998-11-10 Chemand Corp. Liquid transfer system
US6234759B1 (en) * 1998-07-16 2001-05-22 Ewald Hennel Method for regulating a fluid pressure

Also Published As

Publication number Publication date
ATE421069T1 (de) 2009-01-15
SE0302470D0 (sv) 2003-09-16
SE0302470L (sv) 2005-03-17
EP1664618B1 (fr) 2009-01-14
EP1664618A1 (fr) 2006-06-07
SE526018C2 (sv) 2005-06-14
DE602004019113D1 (de) 2009-03-05

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