EP2642122A1 - Pump power unit - Google Patents
Pump power unit Download PDFInfo
- Publication number
- EP2642122A1 EP2642122A1 EP12160580.2A EP12160580A EP2642122A1 EP 2642122 A1 EP2642122 A1 EP 2642122A1 EP 12160580 A EP12160580 A EP 12160580A EP 2642122 A1 EP2642122 A1 EP 2642122A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- valve
- housing
- low
- pump
- 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
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Classifications
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- 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
- F04B1/08—Control regulated by delivery pressure
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- 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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/06—Mobile combinations
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- 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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
Definitions
- the invention relates to a pump unit according to the preamble of patent claim 1.
- Such a pump unit A ( Fig. 1 and 2 ) is manufactured and distributed by the applicant and is used for installation, for example in portable tool units, such as torque wrenches for high torque torques for installation of wind turbines, which in a version with a non-starting single-phase AC under oil motor 7 in a valve combination V outside the housing, a pressure switch DW is included, which can be omitted in designs (not shown) with a starting against pressure three-phase under oil engine.
- the housing which is often installed in horizontal operating position, consists of an externally ribbed pipe section 1, mounted thereon housing covers 2, 4, and an optionally provided cooling fan 3 on a housing cover 2.
- the housing has ( Fig.
- valve combination V contains, in addition to the system pressure limiting valve DB, a low-pressure reversing valve U to the return line 9, a check valve R, optionally a pressure switch DW with assigned diaphragm B and optionally a secondary pressure limiting valve SD. At least one directional valve W is attached to the block structure of the valve combination V.
- a similar pump unit with a two-circuit pump system is known from EP 2 330 304 A , Again, the valve combination is mounted outside on the housing.
- the invention has for its object to provide a pump unit of the type mentioned with reduced for a given performance specification weight.
- the pump unit By incorporating at least the low pressure switching valve and the check valve into the housing interior, so to speak under oil, in a more compact arrangement with shorter flow paths and easy mounting options and by a reduced oil absorption volume in the housing by the incorporated components, the pump unit is considerably easier, and is also the structure externally mounted components less bulky. Since the delivery flows of the pumps are already combined inside the housing and only a single pressure outlet of the housing is required, this restructuring also contributes to the weight saving compared to the known construction and an external sealing area is saved. The weight savings can be further increased if a smaller sub-oil engine with high or increased power density is used. With a pump unit with a single-phase AC under-oil engine and a pressure switch, more than one third of the weight can be saved compared with a known pump unit of the same performance specification.
- the pressure switch is installed to the return line, but with an associated aperture together with the low pressure switching valve and the check valve inside the housing and in a very compact overall arrangement in the housing , which further saves weight.
- a three-phase oil sub engine is used instead of an AC sub oil engine, the structural conditions for integrating the pressure switch and its diaphragm can optionally be retained without, however, installing the pressure switch and the diaphragm.
- the flow channels provided for their functions can be closed by plugs.
- the low pressure switching valve, the check valve, and optionally the pressure switch are arranged with their diaphragm in a common, very compact valve block which is mounted inside the housing to pump elements of both pumps, wherein the pump elements are installed on a housing inner wall structure.
- This equipment components are grouped in this way in a confined space, resulting in a noticeable weight savings, and only a small volume of oil is occupied.
- valve block which receives the equipment components inside the housing, has only a single outlet which passes through the housing inner wall structure the pressure outlet of the housing is connected, which indirectly contributes to weight savings, because housing channels are shortened and eliminated and only an outer sealing area is needed.
- the valve block has an approximately trapezoidal outline, which can be snuggled into a space-saving manner in an approximately circular inner cross-section of the housing.
- This valve block can be made extremely compact, and contains in a confined space all incorporated inside the housing valve components.
- a plurality of high-pressure and low-pressure pump elements of the two pumps are installed in the circumferential direction about a drive shaft of the sub-oil engine alternately and substantially in the same radial plane of the housing on the housing inner wall structure.
- three high-pressure pump elements and three low-pressure pump elements are expedient, which are connected to each other via a high-pressure or a low-pressure pressure collecting ring, which summarizes the flow rates.
- This concept is favorable for mounting the valve block, which, preferably, is mounted on collecting plates of the low-pressure pressure collecting ring, which thus also take on the additional task of placing the valve block. This design saves considerable space, especially in the direction of the drive shaft axis.
- the high-pressure pressure collecting ring In view of a compact construction inside the housing despite the incorporation of the equipment components, it is expedient for the high-pressure pressure collecting ring to have a body which is mounted under a high-pressure pump element and has a connection extension through which the outlet of the valve block communicates with the pressure outlet of the housing is connected. This takes place, preferably, via a pressure tube pressed into the connection extension of the body and through the drilled-out housing inner wall structure. In this way, the single outlet of the valve block is connected in a short path to the pressure outlet of the housing.
- the pump unit can be designed for a standing or a horizontal operating position, depending on the selected operating position suction hoses are performed on at least some of the high pressure and / or low pressure pump elements to a dependent depending on the use position deep sump inside the housing. Especially in portable tool units such a pump unit is usually installed in horizontal operating position.
- the housing has an externally ribbed pipe section with the internally molded housing inner wall structure both for fixing the lower oil motor and for mounting the pump, e.g. a light metal cast body, which is closed at both ends by attached housing cover.
- a housing cover carries a cooling fan, such as an electric cooling fan.
- external parts of the valve combination are mounted with the directional control valve on the single pressure outlet of the housing to the housing outer wall, in particular the system pressure relief valve, and a secondary pressure relief valve, wherein the directional control valve can be mounted either on the system pressure relief valve or the secondary pressure relief valve.
- a weight-saving design is given when the diaphragm, the check valve, the low-pressure switching valve and the optionally provided pressure switch have in each case in valve blocks running in the valve block connected inside the valve inserts used. This is convenient to install and also saves costs, since highly loaded or specially machined or tempered valve inserts made of high-quality steel or tool steel are housed in the block bores of the valve block made of plain steel.
- a compact housing of the internally incorporated components of the valve combination is possible when a connection of the valve block with an outlet of the high-pressure pressure collecting ring and the single outlet of the valve block are connected to an inlet of the body of the high-pressure pressure collecting ring via a respective inserted pressure tube, and if the Valve block with an inlet to the check valve sealed directly above an outlet, preferably in a collecting plate, the low-pressure pressure collecting ring is mounted.
- the valve block with a minimum volume of material, since the port, the outlet and the inlet can be placed directly in at least one outer side of the valve block.
- Fig. 1 shows that the housing 1, 2, 3, 4 of the pump unit A according to the invention for the given performance specification same external dimensions
- the valve combination V in the known pump unit A in Fig. 1 outside the low-pressure switching valve U, the check valve R, the system pressure limiting valve DB, the pressure switch DW with associated diaphragm B and the optional secondary pressure relief valve SD comprises in Fig. 3 , outside only the system pressure limiting valve DB, the optional provided secondary pressure relief valve SD of the valve combination V and the at least one directional control valve W in the pump unit A according to the invention mounted externally, with fastening screws 15 on a single pressure outlet 13 of the housing.
- the housing comprises the pipe section 1, the housing cover 2, 4 and optionally the example electric cooling fan 3.
- the pipe section 1 may be a light metal or light metal alloy casting.
- the pump set A in Fig. 4 is to scale different from the pump unit A of the prior art in Fig. 2
- the high-pressure pump 5 discharge pressure P1
- the low-pressure pump 6 delivery pressure P3
- this common electric under oil motor 7, here for example a single-phase AC motor to start the pressure switch DW should have.
- the housing has the return connection 8, through which the return line 9 extends from the valve combination V and the directional control valve W into the housing interior.
- the pump unit A has only a single pressure outlet 13 (delivery pressure P ') to the valve combination V on the housing.
- the pressure outlet 13 comprises a ( Fig. 6 ) Pressure tube 23, which leads from a single outlet 14 of an inner valve block 10 to the pressure outlet 13, over which the valve combination V is mounted externally on the housing.
- the valve block 10 includes the baffle B, the check valve R, the low pressure switching valve U and the optional pressure switch DW.
- the delivery outlet of the high pressure pump 5 is connected at 11 to the valve block 10, for example by means of a pressure tube 38 (delivery pressure P1 of the high pressure pump 5), while the delivery outlet of the low pressure pump 6 is connected to an inlet 12 in the valve block 10 (delivery pressure P3 of the low pressure pump 6).
- the low-pressure switching valve U is biased by a spring 37 in the reverse direction, and is connected via a pilot line 41 with an aperture 42 therein in the open direction applied.
- the pressure switch DW if present, is biased by a spring 35 in the up direction to the return line 9 by a spring 35 and in up and Zu Kunststoffraumen also via pilot lines 31, 31 'acted upon, which are formed as housing channels in the valve block 10.
- the housing channels in the valve block 10 may be closed by plugs 40, or, alternatively, an even more compact valve block 10 may be used, which the pressure switch DW (and does not contain the diaphragm B) (not shown).
- the housing channels in the valve block 10 in Fig. 4 (Pilot control line 31, a branch line via the check valve R, the pilot line 41, and a connecting line 32 via the pressure switch DW to the return channel 9 branches off from a pressure line in the valve block 10 from the inlet 11 to the outlet 14 and via the pressure tube 23 to the pressure outlet 13th
- the low-pressure change-over valve U is contained in a working line guided from the second inlet 12 of the valve block 10 to the return line 9, to which the connecting line guided via the check valve R is connected to the single outlet 14 of the valve block 10, a further pressure tube 39 can be installed (see also Fig. 6 ).
- Fig. 5 shows the pump unit A of the invention in a side view with omitted valve combination V.
- pressure P ' On both sides of the single pressure outlet 13 (pressure P ') are bores 15' for the in Fig. 3 placed fastening screws 15 shown.
- the return port 8 may be located in the housing outer wall.
- FIG. 6 The sectional view in Fig. 6 (Section VI - VI in Fig. 5 ) shows the internal structure of the housing 1, 2, 4, 3 in detail.
- the pipe section of the housing 1 has a molded-in inner wall structure 16, which serves for mounting a stator of the sub-oil motor 7, the drive shaft 24 through an unspecified highlighted bearing in the inner wall structure 16 to a drive eccentric 25 for the high pressure and low pressure pumps 5, 6 leads.
- the high-pressure pump 5 consists in the embodiment shown, for example, three offset by 120 ° about the drive shaft axis offset piston pump elements 5 ', which are mounted on a high-pressure pressure collecting ring 19 and with this on the inner wall structure 16.
- the low-pressure pump 6 likewise comprises, for example, three low-pressure piston pump elements 6 'which are grouped around the drive shaft axis 24 by 120 ° and mounted, for example, via spacers with fastening screws 17 on the housing inner wall structure 16, so that they are in the circumferential direction regularly alternating high-pressure pump elements 5 'and low-pressure pump elements 6'.
- a low-pressure pressure collecting ring 26 is mounted, on which directly the valve block 10 can be mounted, with the same fastening screws 17 Fig. 7, 8 and 14, 15 directed.
- the three collecting plates 27 of the low pressure pressure collecting ring 26 are connected to each other via pipe sections 28, so that all three low-pressure pump elements 6 'together in the second inlet 12 promote.
- FIGS. 14 and 15 illustrated body 20 via pipe sections 21 with two further bodies 22, 22 '( Fig. 14 ) of the high-pressure collecting ring.
- a pressure tube 39 connects the single outlet 14 of the valve block 10 to the body 20.
- Another pressure tube 38 (pressure P1) connects the inlet 11 of the valve block 10 with another body 22 '(FIG. Fig. 14
- the valve block 10 contains the check valve R, the diaphragm B, the low-pressure changeover valve U, and the optionally required pressure switch DW in an extremely compact arrangement and connected according to in Fig. 4 indicated housing channels in the valve block 10.
- At least some of the high-pressure and / or low-pressure pump elements 5 ', 6' are connected via suction hoses 18 with a depending on the operating position of the pump unit A (vertical or horizontal) low-lying oil sump (return line 9).
- Fig. 7 illustrates a mounting phase of the pump assembly A, in which initially the high-pressure pump elements 5 'and the low-pressure pump elements 6' and the suction hoses 18, the in Fig. 7 non-visible high-pressure pressure collecting ring 19 and the low-pressure collecting ring 26 with the pipe sections 28 and the collecting plates 27 are mounted on the low pressure pump elements 6 'on the housing inner wall structure 16.
- the high-pressure pressure collecting ring 19 is a port exposed to the inlet 11 of the valve block 10 (FIG. Fig. 6 ), while in the body 20 of the high-pressure pressure collecting ring 19 under another high-pressure pump element 5 'an inlet 14' is exposed, which is aligned with the single outlet 14 of the valve block 10 to be mounted.
- valve block 10 is installed under the suction hoses 18 and fixed with the same fastening screws 17, which also fix two of the low-pressure pump elements 6 'on the housing inner wall structure 16.
- the pressure pipes 38, 39 (indicated by dashed lines), make pressure-tight connections between the valve block 10 and the bodies 22 ', 20 of the high-pressure pressure collecting ring 19 ago.
- Fig. 9 is a side view of the valve block 10, which may have an approximately trapezoidal outline, and according to Fig. 8 is nestled in the largely round inner cross-section of the housing.
- Fig. 9 shows the valve block outside, in which the only outlet 14 (pressure P '), in which the pressure tube 39 is introduced, the inlet 11, in which the pressure tube 38 is introduced (pressure P1), and the area 12 with the opening 29th lie to the check valve R.
- pressure P ' the only outlet 14
- the pressure P1 in which the pressure tube 39 is introduced
- pressure P1 the area 12 with the opening 29th lie to the check valve R.
- Fig. 9 the grouping of the diaphragm B, the pressure switch DW, the low-pressure switching valve U and the check valve R in the valve block 10th
- FIG. 10 The corresponding sectional view in Fig. 10 (Section plane X - X in Fig. 9 ) shows a baffle insert 30 in a block bore, to which the inlet 11 is connected, branches off from the upstream of the baffle insert 30, the control line 31 to the closing control side of the pressure switch DW, and branches off from the downstream of the baffle insert 30, the connecting line 32, via the pressure switch DW leads to the return channel 9.
- Some of the block holes are in Fig. 10 closed by screw plugs.
- Fig. 11 shows in section (section plane XI - XI in Fig. 9 ) the pressure switch DW, which includes a seat valve cone 33 in a block bore, which cooperates with a valve seat 34 of a sleeve insert and is acted upon by the spring 35 in the opening direction.
- the control line 31 is connected, while the control line 31 'branches off from the connecting line 32 and leads to the opening control side in the region of the spring 35 of the seat poppet 33.
- Fig. 12 shows in section (section plane XII - XII in Fig. 9 ) the low-pressure switching valve U with a valve spool 36 in a block bore of the valve block 10.
- the valve spool 36 is acted upon in the blocking position shown by the spring 37 and separates a housing channel 43 of the return line 9.
- the valve spool 36 ( Fig. 12 up) is the valve spool 36, the diaphragm (or nozzle) 42 from the control channel 41 is applied, which branches off from the coming of the diaphragm B connecting line 32.
- Fig. 13 shows in section (section plane XIII - XIII in Fig. 9 ) the check valve R with a seat 44 forming Einschraubhub and a mushroom-shaped valve member 45 which separates the connection line 32 from the low pressure switching valve U leading channel 43 in a block bore.
- the block bore has the opening 29 (pressure P3) with the in Fig. 7 shown opening 29 'is aligned.
- Fig. 14 schematically illustrates the high-pressure pressure collecting ring 19 with the three bodies 20, 22 and 22 ', which are connected to each other via the pipe sections 21.
- the body 20 has on one side a connection extension 47 in which a bore 46 for pressing in the pressure tube 23 is formed, which is connected via a channel 48 to a connection 39 "in which the pressure tube 39 is seated
- High-pressure pressure collecting ring 19 has a connection 38 ", in which the pressure tube 38 is seated, and which communicates with the pipe section 21.
- shutoff position of the low pressure switching valve U are combined and first flow through the standing in the passage position pressure switch DW in the return line 9, so that the lower oil motor 7 is able to start easily in the case of a single-phase AC motor.
- the pressure switch DW is brought into the blocking position via the control line 31 so that when the check valve R is open, the pumped pressure medium (pressure P ') is present at the single pressure outlet 13 of the housing ,
- the low-pressure switching valve U is controlled, so that the flow rate (delivery pressure P3) of the low-pressure pump 6 low resistance is promoted in the return line 9, and only the high-pressure pump 5 at then kept closed check valve R to the single pressure outlet 13 promotes (pressure P ') until finally the desired maximum pressure (limited by the system pressure relief valve DB) of, for example, 700 bar is reached, which is processable at the pressure port P from the directional control valve W.
- the secondary pressure is limited by the secondary pressure relief valve SD to 100 bar at the consumer port A '.
- the summed flow rates of both pumps 5, 6 are used, for example, for a fast idle stroke, while the flow is used only the high-pressure pump 5 to build up the required high maximum pressure of, for example, about 700 bar, after the backlash is passed.
- the pressure switch DW can be omitted or passivated.
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Abstract
Description
Die Erfindung betrifft ein Pumpenaggregat gemäß Oberbegriff des Patentanspruchs 1.The invention relates to a pump unit according to the preamble of
Ein solches Pumpenaggregat A (
Ein ähnliches Pumpenaggregat mit einem Zweikreis-Pumpensystem ist bekannt aus
Weiterer Stand der Technik ist enthalten in
Der Erfindung liegt die Aufgabe zugrunde, ein Pumpenaggregat der eingangs genannten Art mit bei einer gegebenen Leistungsspezifikation verringertem Gewicht zu schaffen.The invention has for its object to provide a pump unit of the type mentioned with reduced for a given performance specification weight.
Die gestellte Aufgabe wird mit den Merkmalen des Patentanspruchs 1 gelöst.The stated object is achieved with the features of
Durch die Eingliederung zumindest des Niederdruck-Umschaltventils und des Rückschlagventils ins Gehäuseinnere, sozusagen unter Öl, in einer kompakteren Anordnung mit kürzeren Strömungswegen und einfachen Befestigungsmöglichkeiten sowie durch ein verringertes Ölaufnahmevolumen im Gehäuse durch die eingegliederten Komponenten wird das Pumpenaggregat erheblich leichter, und ist auch der Aufbau außen montierter Komponenten weniger ausladend. Da auch die Förderströme der Pumpen schon im Gehäuseinneren vereinigt werden und nur ein einziger Druckauslass des Gehäuses benötigt wird, trägt auch diese Umstrukturierung gegenüber der bekannten Bauweise zur Gewichtseinsparung bei und wird ein äußerer Abdichtbereich eingespart. Die Gewichtseinsparung kann noch gesteigert werden, wenn ein kleinerer Unterölmotor mit hoher oder gesteigerter Leistungsdichte eingesetzt wird. Bei einem Pumpenaggregat mit einem Einphasen-Wechselstrom-Unterölmotor und einer Druckweiche lässt sich so gegenüber einem bekannten Pumpenaggregat gleicher Leistungsspezifikation mehr als ein Drittel an Gewicht einsparen.By incorporating at least the low pressure switching valve and the check valve into the housing interior, so to speak under oil, in a more compact arrangement with shorter flow paths and easy mounting options and by a reduced oil absorption volume in the housing by the incorporated components, the pump unit is considerably easier, and is also the structure externally mounted components less bulky. Since the delivery flows of the pumps are already combined inside the housing and only a single pressure outlet of the housing is required, this restructuring also contributes to the weight saving compared to the known construction and an external sealing area is saved. The weight savings can be further increased if a smaller sub-oil engine with high or increased power density is used. With a pump unit with a single-phase AC under-oil engine and a pressure switch, more than one third of the weight can be saved compared with a known pump unit of the same performance specification.
Bei einer zweckmäßigen Ausführungsform des Pumpenaggregats mit einem Wechselstrom-Unterölmotor, der gegen Druck nicht zuverlässig anläuft, wird die Druckweiche zur Rücklaufleitung verbaut, jedoch mit einer zugeordneten Blende zusammen mit dem Niederdruck-Umschaltventil und dem Rückschlagventil im Gehäuseinneren und in einer sehr kompakten Gesamtanordnung im Gehäuse, wodurch weiterhin Gewicht eingespart wird. Falls anstelle eines Wechselstrom-Unterölmotor ein Drehstrom-Unterölmotor eingesetzt wird, können optional die baulichen Voraussetzungen zum Eingliedern der Druckweiche und deren Blende erhalten bleiben, ohne jedoch die Druckweiche und die Blende einzubauen. Die für deren Funktionen vorgesehenen Strömungskanäle können durch Stopfen verschlossen werden.In an expedient embodiment of the pump unit with an AC under oil engine, which does not start reliably against pressure, the pressure switch is installed to the return line, but with an associated aperture together with the low pressure switching valve and the check valve inside the housing and in a very compact overall arrangement in the housing , which further saves weight. If a three-phase oil sub engine is used instead of an AC sub oil engine, the structural conditions for integrating the pressure switch and its diaphragm can optionally be retained without, however, installing the pressure switch and the diaphragm. The flow channels provided for their functions can be closed by plugs.
Zweckmäßig sind das Niederdruck-Umschaltventil, das Rückschlagventil, und gegebenenfalls die Druckweiche mit ihrer Blende in einem gemeinsamen, sehr kompakten Ventilblock angeordnet, der im Inneren des Gehäuses an Pumpenelementen beider Pumpen montiert ist, wobei die Pumpenelemente an einer Gehäuse-Innenwandstruktur verbaut sind. Diese Ausstattungskomponenten werden auf diese Weise auf engstem Raum gruppiert, wodurch sich eine spürbare Gewichtseinsparung ergibt, und nur ein geringes Ölvolumen okkupiert wird.Suitably, the low pressure switching valve, the check valve, and optionally the pressure switch are arranged with their diaphragm in a common, very compact valve block which is mounted inside the housing to pump elements of both pumps, wherein the pump elements are installed on a housing inner wall structure. This equipment components are grouped in this way in a confined space, resulting in a noticeable weight savings, and only a small volume of oil is occupied.
Zweckmäßig weist der Ventilblock, der die Ausstattungskomponenten im Gehäuseinneren aufnimmt, nur einen einzigen Auslass auf, der durch die Gehäuse-Innenwandstruktur hindurch mit dem Druckauslass des Gehäuses verbunden wird, was indirekt zur Gewichtseinsparung beiträgt, weil Gehäusekanäle verkürzt sind und wegfallen und nurmehr ein äußerer Abdichtbereich benötigt wird.Suitably, the valve block, which receives the equipment components inside the housing, has only a single outlet which passes through the housing inner wall structure the pressure outlet of the housing is connected, which indirectly contributes to weight savings, because housing channels are shortened and eliminated and only an outer sealing area is needed.
Zweckmäßig weist der Ventilblock einen annähernd trapezförmigen Umriss auf, der sich platzsparend in einen annähernd kreisförmigen Innenquerschnitt des Gehäuses einschmiegen lässt. Dieser Ventilblock lässt sich außerordentlich kompakt gestalten, und enthält auf engstem Raum alle innen im Gehäuse eingegliederten Ventilkomponenten.Suitably, the valve block has an approximately trapezoidal outline, which can be snuggled into a space-saving manner in an approximately circular inner cross-section of the housing. This valve block can be made extremely compact, and contains in a confined space all incorporated inside the housing valve components.
Bei einer zweckmäßigen Ausführungsform sind mehrere Hochdruck- und Niederdruck-Pumpenelemente der beiden Pumpen in Umfangsrichtung um eine Antriebswelle des Unterölmotors abwechselnd und im Wesentlichen in der gleichen Radialebene des Gehäuses am der Gehäuse-Innenwandstruktur verbaut. Um einen hohen Gleichförmigkeitsgrad bei der Förderung zu erzielen, sind jeweils drei Hochdruck-Pumpenelemente und drei Niederdruck-Pumpenelemente zweckmäßig, die jeweils über einen Hochdruck- bzw. einen Niederdruck-Drucksammelring miteinander verbunden werden, der jeweils die Förderströme zusammenfasst. Dieses Konzept ist zur Montage des Ventilblockes günstig, der, vorzugsweise, auf Sammelplatten des Niederdruck-Drucksammelrings montiert ist, die somit auch die zusätzliche Aufgabe zum Platzieren des Ventilblocks übernehmen. Diese Bauweise spart vor allem in Richtung der Antriebswellenachse erheblich Bauraum.In an expedient embodiment, a plurality of high-pressure and low-pressure pump elements of the two pumps are installed in the circumferential direction about a drive shaft of the sub-oil engine alternately and substantially in the same radial plane of the housing on the housing inner wall structure. In order to achieve a high degree of uniformity in the promotion, three high-pressure pump elements and three low-pressure pump elements are expedient, which are connected to each other via a high-pressure or a low-pressure pressure collecting ring, which summarizes the flow rates. This concept is favorable for mounting the valve block, which, preferably, is mounted on collecting plates of the low-pressure pressure collecting ring, which thus also take on the additional task of placing the valve block. This design saves considerable space, especially in the direction of the drive shaft axis.
Im Hinblick auf einen trotz der Eingliederung der Ausstattungskomponenten innen in das Gehäuse kompakten Aufbau ist es zweckmäßig, wenn der Hochdruck-Drucksammelring einen unter einem Hochdruck-Pumpenelement montierten, einen Anschluss-Fortsatz umfassenden Körper aufweist, durch den hindurch der Auslass des Ventilblocks mit dem Druckauslass des Gehäuses verbunden ist. Dies erfolgt, vorzugsweise, über ein in den Anschluss-Fortsatz des Körpers und durch die aufgebohrte Gehäuse-Innenwandstruktur eingepresstes Druckrohr. Auf diese Weise ist der einzige Auslass des Ventilblocks auf kurzem Weg mit dem Druckauslass des Gehäuses verbunden.In view of a compact construction inside the housing despite the incorporation of the equipment components, it is expedient for the high-pressure pressure collecting ring to have a body which is mounted under a high-pressure pump element and has a connection extension through which the outlet of the valve block communicates with the pressure outlet of the housing is connected. This takes place, preferably, via a pressure tube pressed into the connection extension of the body and through the drilled-out housing inner wall structure. In this way, the single outlet of the valve block is connected in a short path to the pressure outlet of the housing.
Das Pumpenaggregat kann für eine stehende oder eine liegende Betriebsposition konzipiert sein, indem abhängig von der gewählten Betriebsposition Ansaugschläuche an zumindest einigen der Hochdruck- und/oder Niederdruck-Pumpenelementen bis in einen abhängig von der Gebrauchsposition tiefliegenden Ölsumpf im Gehäuseinneren geführt sind. Speziell in tragbaren Werkzeugaggregaten wird ein solches Pumpenaggregat meist in liegender Betriebsposition verbaut.The pump unit can be designed for a standing or a horizontal operating position, depending on the selected operating position suction hoses are performed on at least some of the high pressure and / or low pressure pump elements to a dependent depending on the use position deep sump inside the housing. Especially in portable tool units such a pump unit is usually installed in horizontal operating position.
Für das Pumpenaggregat empfiehlt sich eine Bauweise, bei der das Gehäuse einen außen verrippten Rohrabschnitt mit der innen eingeformten Gehäuse-Innenwandstruktur sowohl zum Fixieren des Unterölmotors als auch zur Montage der Pumpen aufweist, z.B. einen Leichtmetallgusskörper, der an beiden Enden durch angebrachte Gehäusedeckel verschlossen wird. Für Dauerbetrieb des Pumpenaggregats oder zur thermischen Entlastung des im Gehäuse bevorrateten Öls kann es zweckmäßig sein, wenn ein Gehäusedeckel ein Kühlgebläse trägt, beispielsweise ein elektrisches Kühlgebläse.For the pump unit is recommended a construction in which the housing has an externally ribbed pipe section with the internally molded housing inner wall structure both for fixing the lower oil motor and for mounting the pump, e.g. a light metal cast body, which is closed at both ends by attached housing cover. For continuous operation of the pump set or for the thermal relief of the oil stored in the housing, it may be expedient if a housing cover carries a cooling fan, such as an electric cooling fan.
Zweckmäßig sind außenliegende Teile der Ventilkombination mit dem Wegeventil über dem einzigen Druckauslass des Gehäuses an der Gehäuseaußenwand montiert, insbesondere das Systemdruckbegrenzungsventil, und ein Sekundärdruckbegrenzungsventil, wobei das Wegeventil entweder am Systemdruckbegrenzungsventil oder am Sekundärdruckbegrenzungsventil angebracht sein kann.Advantageously, external parts of the valve combination are mounted with the directional control valve on the single pressure outlet of the housing to the housing outer wall, in particular the system pressure relief valve, and a secondary pressure relief valve, wherein the directional control valve can be mounted either on the system pressure relief valve or the secondary pressure relief valve.
Eine gewichtssparende Bauweise ist gegeben, wenn die Blende, das Rückschlagventil, das Niederdruck-Umschaltventil und die gegebenenfalls vorgesehene Druckweiche jeweils in über innen im Ventilblock verlaufende Kanäle verbundenen Blockbohrungen eingesetzte Ventileinsätze aufweisen. Dies ist montagetechnisch günstig und spart zudem Kosten, da hochbelastete oder speziell bearbeitete oder vergütete Ventileinsätze aus hochwertigem Stahl oder Werkzeugstahl in den Blockbohrungen des aus einfachem Stahl hergestellten Ventilblocks untergebracht sind.A weight-saving design is given when the diaphragm, the check valve, the low-pressure switching valve and the optionally provided pressure switch have in each case in valve blocks running in the valve block connected inside the valve inserts used. This is convenient to install and also saves costs, since highly loaded or specially machined or tempered valve inserts made of high-quality steel or tool steel are housed in the block bores of the valve block made of plain steel.
Eine kompakte Unterbringung der innen eingegliederten Komponenten der Ventilkombination ist möglich, wenn ein Anschluss des Ventilblocks mit einem Auslass des Hochdruck-Drucksammelrings und der einzige Auslass des Ventilblocks mit einem Einlass des Körpers des Hochdruck-Drucksammelrings über je ein eingesetztes Druckrohr verbunden sind, und wenn der Ventilblock mit einem Einlass zum Rückschlagventil abgedichtet direkt über einem Auslass, vorzugsweise in einer Sammelplatte, des Niederdruck-Drucksammelring montiert ist. Auf diese Weise kommt der Ventilblock mit einem minimalen Materialvolumen aus, da der Anschluss, der Auslass und der Einlass direkt in wenigstens einer Außenseite des Ventilblocks platziert werden können.A compact housing of the internally incorporated components of the valve combination is possible when a connection of the valve block with an outlet of the high-pressure pressure collecting ring and the single outlet of the valve block are connected to an inlet of the body of the high-pressure pressure collecting ring via a respective inserted pressure tube, and if the Valve block with an inlet to the check valve sealed directly above an outlet, preferably in a collecting plate, the low-pressure pressure collecting ring is mounted. In this way, the valve block with a minimum volume of material, since the port, the outlet and the inlet can be placed directly in at least one outer side of the valve block.
Anhand der Zeichnungen werden Ausführungsformen des Erfindungsgegenstandes erläutert. Es zeigen:
- Fig. 1 und 2
- eine Seitenansicht und ein zugehöriges Blockschaltbild eines Pumpenaggregats des Standes der Technik,
- Fig. 3
- eine Seitenansicht eines Pumpenaggregats gemäß der Erfindung, in einer Blickrichtung analog zu
Fig. 1 , - Fig. 4
- das Pumpenaggregat gemäß der Erfindung und
Fig. 3 als Blockschaltbild, - Fig. 5
- eine Seitenansicht des erfindungsgemäßen Pumpenaggregats, wobei außenliegende Ausstattungskomponenten weggelassen sind,
- Fig. 6
- einen Querschnitt in der Schnittebene VI - VI in
Fig. 5 des erfindungsgemäßen Pumpenaggregats, - Fig. 7
- eine Montagephase des erfindungsgemäßen Pumpenaggregats bei abgenommenem unteren Gehäusedeckel,
- Fig. 8
- eine weitere Montagephase bei abgenommenem unterem Gehäusedeckel, jeweils in Blickrichtung von unten in
Fig. 6 , - Fig. 9
- einen in
Fig. 8 bereits montierten, hier losgelöst gezeigten Ventilblock mit eingegliederten Ausstattungskomponenten, in einer Seitenansicht und größerem Maßstab, - Fig. 10
- einen Schnitt des Ventilblocks in der Schnittebene X - X in
Fig. 9 , - Fig. 11
- einen Schnitt des Ventilblocks in der Schnittebene XI - XI in
Fig. 9 , - Fig. 12
- einen Schnitt des Ventilblocks in der Schnittebene XII - XII in
Fig. 9 , - Fig. 13
- einen Schnitt des Ventilblocks in der Schnittebene XIII - XIII in
Fig. 9 , - Fig. 14
- eine schematische Draufsicht eines Hochdruck-Drucksammelrings, der in den
Fig. 6 ,7 und 8 in montiertem Zustand angedeutet ist, und - Fig. 15
- eine Seitenansicht des Hochdruck-Drucksammelrings von
Fig. 14 in Blickrichtung von links inFig. 14 .
- Fig. 1 and 2
- a side view and an associated block diagram of a pump unit of the prior art,
- Fig. 3
- a side view of a pump unit according to the invention, in a viewing direction analogous to
Fig. 1 . - Fig. 4
- the pump unit according to the invention and
Fig. 3 as a block diagram, - Fig. 5
- a side view of the pump unit according to the invention, wherein external equipment components are omitted,
- Fig. 6
- a cross section in the section plane VI - VI in
Fig. 5 the pump unit according to the invention, - Fig. 7
- an assembly phase of the pump unit according to the invention with the lower housing cover removed,
- Fig. 8
- another assembly phase with removed lower housing cover, respectively as viewed from below in
Fig. 6 . - Fig. 9
- one in
Fig. 8 already mounted, here detached valve block with integrated equipment components, in a side view and larger scale, - Fig. 10
- a section of the valve block in the sectional plane X - X in
Fig. 9 . - Fig. 11
- a section of the valve block in the sectional plane XI - XI in
Fig. 9 . - Fig. 12
- a section of the valve block in the sectional plane XII - XII in
Fig. 9 . - Fig. 13
- a section of the valve block in the sectional plane XIII - XIII in
Fig. 9 . - Fig. 14
- a schematic plan view of a high-pressure pressure collecting ring, in the
Fig. 6 .7 and 8 is indicated in the assembled state, and - Fig. 15
- a side view of the high-pressure pressure collecting ring of
Fig. 14 in view from the left inFig. 14 ,
Für bei der Erläuterung des Standes der Technik gemäß
Bereits der Vergleich zwischen den
Das Gehäuse umfasst den Rohrabschnitt 1, die Gehäusedeckel 2, 4 und optional das beispielsweise elektrische Kühlgebläse 3. Der Rohrabschnitt 1 kann ein Leichtmetall- oder Leichtmetalllegierungs-Gussteil sein. Die in
Das Pumpenaggregat A in
Das erfindungsgemäße Pumpenaggregat A (
Das Niederdruck-Umschaltventil U ist durch eine Feder 37 in Sperrrichtung vorbelastet, und wird über eine Vorsteuerleitung 41 mit einer darin enthaltenen Blende 42 in Aufsteuerrichtung beaufschlagt. Die Druckweiche DW, falls vorhanden, wird durch eine Feder 35 in Aufsteuerrichtung zur Rücklaufleitung 9 durch eine Feder 35 vorgespannt und in Auf- und Zusteuerrichtungen ferner über Vorsteuerleitungen 31, 31' beaufschlagt, die als Gehäusekanäle im Ventilblocks 10 ausgebildet sind.The low-pressure switching valve U is biased by a
Für eine Ausführungsform des erfindungsgemäßen Pumpenaggregats A in
Die Gehäusekanäle im Ventilblock 10 in
Die Schnittdarstellung in
Die Hochdruckpumpe 5 besteht bei der gezeigten Ausführungsform beispielsweise aus drei um 120° um die Antriebswellenachse versetzt montierten Kolbenpumpenelementen 5', die auf einem Hochdruck-Drucksammelring 19 und mit diesem an der Innenwandstruktur 16 montiert sind. Die Niederdruckpumpe 6 umfasst bei der gezeigten Ausführungsform ebenfalls beispielsweise drei Niederdruck-Kolbenpumpenelemente 6', die um je 120° zueinander versetzt um die Antriebswellenachse 24 gruppiert und beispielsweise über Distanzscheiben mit Befestigungsschrauben 17 an der Gehäuse-Innenwandstruktur 16 montiert sind, so dass sich in Umfangsrichtung regelmäßig Hochdruck-Pumpenelemente 5' und Niederdruck-Pumpenelemente 6' abwechseln. Auf den Niederdruck-Pumpenelementen 6' ist ein Niederdruck-Drucksammelring 26 montiert, auf welchem direkt der Ventilblock 10 montiert sein kann, und zwar mit denselben Befestigungsschrauben 17. Hierzu wird auf die
Zum zweiten Einlass 12 des Ventilblocks 10 (Öffnung 29) führt ein Druckventil des linksseitigen Niederdruck-Pumpenelementes 6' durch eine Sammelplatte 27 des Niederdruck-Drucksammelringes 26. Die drei Sammelplatten 27 des Niederdruck-Drucksammelrings 26 sind miteinander über Rohrabschnitte 28 verbunden sind, so dass alle drei Niederdruck-Pumpenelemente 6' gemeinsam in den zweiten Einlass 12 fördern.To the
Vom Hochdruck-Drucksammelring 19 ist in
In
Die zugehörige Schnittdarstellung in
Funktion des Pumpenaggregats A der
Nach Einschalten des Unterölmotors 7 fördern beide Pumpen 5, 6 gemeinsam, wobei ihre Förderströme über das Rückschlagventil R in der in
Die summierten Förderströme beider Pumpen 5, 6 werden beispielsweise für einen schnell auszuführenden Leerhub eingesetzt, während der Förderstrom nur der Hochdruckpumpe 5 zum Aufbauen des erforderlichen hohen Maximaldrucks von beispielsweise etwa 700 bar verwendet wird, nachdem der Leergang durchfahren ist.The summed flow rates of both
Wird der Unterölmotor 7 als Drehstrommotor ausgebildet, der auch gegen Druck anlaufen kann, dann kann die Druckweiche DW entfallen oder passiviert sein.If the lower oil motor 7 is designed as a three-phase motor, which can also start against pressure, then the pressure switch DW can be omitted or passivated.
Wird der Unterölmotor 7 abgeschaltet, und sinkt durch Verbrauch der Druck in der zum Druckauslass 13 führenden Druckleitung entsprechend weit ab, geht das Niederdruck-Umschaltventil U wieder in die gezeigte Absperrstellung und nimmt die Druckweiche DW wieder ihre gezeigte Durchgangsstellung ein, so dass das System druckentlastet ist.If the lower oil motor 7 is switched off, and drops due to consumption of the pressure in the pressure line leading to the
Claims (12)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12160580.2A EP2642122B1 (en) | 2012-03-21 | 2012-03-21 | Pump power unit |
US13/839,122 US9212655B2 (en) | 2012-03-21 | 2013-03-15 | Pump aggregate |
CN201310090780.9A CN103321869B (en) | 2012-03-21 | 2013-03-20 | Pump assembly |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12160580.2A EP2642122B1 (en) | 2012-03-21 | 2012-03-21 | Pump power unit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2642122A1 true EP2642122A1 (en) | 2013-09-25 |
EP2642122B1 EP2642122B1 (en) | 2014-05-21 |
Family
ID=45952874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12160580.2A Not-in-force EP2642122B1 (en) | 2012-03-21 | 2012-03-21 | Pump power unit |
Country Status (3)
Country | Link |
---|---|
US (1) | US9212655B2 (en) |
EP (1) | EP2642122B1 (en) |
CN (1) | CN103321869B (en) |
Cited By (2)
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DE102016225923A1 (en) * | 2016-12-21 | 2018-06-21 | Hawe Hydraulik Se | Pump unit for a hydraulic system and duct element for a pump set |
DE102022129520A1 (en) | 2022-11-08 | 2024-05-08 | Hammelmann GmbH | Drive unit |
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DE102010062936A1 (en) * | 2010-12-13 | 2012-06-14 | Jungheinrich Aktiengesellschaft | hydraulic power unit |
CN105464996B (en) * | 2014-08-15 | 2019-06-11 | 德昌电机(深圳)有限公司 | Electronic liquid pump |
CN107339203A (en) * | 2017-03-06 | 2017-11-10 | 惠州科赛医疗有限公司 | A kind of stabilized pressure pump |
EP4276310A3 (en) * | 2017-05-16 | 2024-01-17 | Enerpac Tool Group Corp. | Hydraulic pump |
DE102018214555B4 (en) * | 2018-08-28 | 2022-09-08 | Hawe Hydraulik Se | Modular motor pump unit |
US11958177B2 (en) | 2018-09-07 | 2024-04-16 | Milwaukee Electric Tool Corporation | Hydraulic piston pump for a hydraulic tool |
US11193508B2 (en) | 2018-11-13 | 2021-12-07 | Enerpac Tool Group Corp. | Hydraulic power system and method for controlling same |
USD924938S1 (en) | 2019-07-29 | 2021-07-13 | Hawe Hydraulik Se | Housing portion for a hydraulic pump |
JP1663497S (en) * | 2019-07-29 | 2020-07-13 | ||
JP1663520S (en) * | 2019-07-29 | 2020-07-13 | ||
SE544129C2 (en) * | 2020-03-09 | 2022-01-04 | Sahlins Sweden Ab | Portable hydraulic unit |
USD1029885S1 (en) * | 2022-02-03 | 2024-06-04 | Knf Flodos Ag | Pump for liquids |
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-
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- 2013-03-15 US US13/839,122 patent/US9212655B2/en not_active Expired - Fee Related
- 2013-03-20 CN CN201310090780.9A patent/CN103321869B/en not_active Expired - Fee Related
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EP1731762A1 (en) | 2005-04-08 | 2006-12-13 | HAWE Hydraulik GmbH & Co. KG | Pump unit |
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DE102016225923A1 (en) * | 2016-12-21 | 2018-06-21 | Hawe Hydraulik Se | Pump unit for a hydraulic system and duct element for a pump set |
DE102016225923B4 (en) | 2016-12-21 | 2020-06-18 | Hawe Hydraulik Se | Pump unit for a hydraulic system and channel element for a pump unit |
DE102022129520A1 (en) | 2022-11-08 | 2024-05-08 | Hammelmann GmbH | Drive unit |
Also Published As
Publication number | Publication date |
---|---|
US20130251558A1 (en) | 2013-09-26 |
CN103321869A (en) | 2013-09-25 |
US9212655B2 (en) | 2015-12-15 |
EP2642122B1 (en) | 2014-05-21 |
CN103321869B (en) | 2017-03-01 |
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