EP3093504A1 - Pressure controlled two-way flow control valve for hydraulics applications and valve assembly with a corresponding two-way flow control valve - Google Patents
Pressure controlled two-way flow control valve for hydraulics applications and valve assembly with a corresponding two-way flow control valve Download PDFInfo
- Publication number
- EP3093504A1 EP3093504A1 EP15167276.3A EP15167276A EP3093504A1 EP 3093504 A1 EP3093504 A1 EP 3093504A1 EP 15167276 A EP15167276 A EP 15167276A EP 3093504 A1 EP3093504 A1 EP 3093504A1
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- Prior art keywords
- flow control
- control valve
- way flow
- pressure
- valve
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- 230000001419 dependent effect Effects 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
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- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/026—Pressure compensating valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
- F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
- F15B2211/3053—In combination with a pressure compensating valve
- F15B2211/30535—In combination with a pressure compensating valve the pressure compensating valve is arranged between pressure source and directional control valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
- F15B2211/50572—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using a pressure compensating valve for controlling the pressure difference across a flow control valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/575—Pilot pressure control
- F15B2211/5753—Pilot pressure control for closing a valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/575—Pilot pressure control
- F15B2211/5756—Pilot pressure control for opening a valve
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/87169—Supply and exhaust
- Y10T137/87217—Motor
Definitions
- the present invention relates to pressure controlled 2-way flow control valves for hydraulic applications and valve assemblies for hydraulic applications having a corresponding 2-way flow control valve.
- proportional directional shifters are generally used to enable simultaneous operation of multiple consumers. In practice, it is often necessary to control several consumers completely individually and simultaneously, which should be done as independent of load pressure as possible.
- a proportional directional spool type PSL with connection blocks and attachment block known is shown schematically a hydro circuit, in which two known proportional directional spool type PSL, denoted in the figure by the reference numerals PS1, PS2, with a suitable terminal block for a constant pump 1 for the operation of two consumers V1, V2 are provided.
- a supply pressure P output from constant-displacement pump 1 is supplied by a supply line 6 to a plurality of highly schematically represented consumers V1, V2, eg hydraulic cylinders, via the respective proportional directional spools PS1, PS2 in order to drive the consumers V1, V2.
- the inflow in front of the proportional directional slides PS1, PS2 is controlled in each case by a pressure-controlled 2-way flow control valve 41, 42, which is arranged in the inflow direction in front of the corresponding proportional directional spool PS1, PS2. If at least one of the consumers V1, V2 is to be operated during operation, the associated proportional directional shifter PS1, PS2 is deflected upwards or downwards from the illustrated blocking state, depending on whether a connection A1, A2 connected to the corresponding consumer V1, V2 is present or B1, B2 is to be connected to the supply line 6. About the stroke of the deflection is given by the proportional directional spool PS1, PS2 a volume flow to the respective consumer V1, V2.
- each 2-way flow control valve 41, 42 is further applied with a pressure signal tapped on the output side of the respective 2-way flow control valve 41, 42 in the control direction (i.e., counteracting the bias) of the respective 2-way flow control valve 41, 42.
- Each of the 2-way flow control valves 41, 42 is biased by a biasing spring in the up direction, so that the 2-way flow control valves 41, 42 are open in the rest state.
- each of the two-way flow control valve 41, 42 regulates a volume flow through the corresponding proportional displacement valve PS1, PS2 load-independent to a constant value.
- the control piston in the 2-way power latch valve 41 or 42 again sets a balance of power, albeit at a larger throttle cross-section in the 2-way flow control valve 41 and 42, so that the reduction of the flow rate and the pressure difference (p A - p LS ).
- the volume flow to the consumer and the pressure difference between the pressure provided by the constant-displacement pump 1 and the pressure in the load circuit to the consumer are regulated to a constant value.
- the pressure difference (p A -p LS ) on the proportional directional spool PS1 or PS2 increases, which corresponds to an increase in the volumetric flow, the 2-way flow control valve is regulated in the direction to until a new equilibrium of forces occurs.
- In-2-way flow control valve shifts a control piston (not shown) in the Zu-control direction, whereby a throttle cross-section in the 2-way flow control valve 41 and 42 decreases. With decreasing throttle cross section but take the Volume flow and the pressure difference (p A - p LS ) again from (the initial increase counteracting), until in turn adjusts a balance of forces.
- Fig. 1b the resulting characteristic of the 2-way flow control valve 41, 42 is shown schematically, in which a volumetric flow Q (along the abscissa in arbitrary units) against a pressure difference ⁇ p (corresponds to a pressure difference pump pressure - p LS ) (along the ordinate in arbitrary units) is applied.
- a volumetric flow Q (along the abscissa in arbitrary units) against a pressure difference ⁇ p (corresponds to a pressure difference pump pressure - p LS ) (along the ordinate in arbitrary units) is applied.
- a control curve section RK with a vertical curve, which means the independence of the volume flow of the pressure difference .DELTA.P when adjusting a balance of forces, since the volume flow in the control curve section is controlled independently of the pressure difference .DELTA.p to a constant value Q 0 .
- a pressure controlled 2-way flow control valve for hydraulic applications.
- a first pressure signal is applied via a first output-side tap in the Zu-control direction of the 2-way flow control valve and a second pressure signal via a LS-Druckmelde effet in up-control direction to the 2-way flow control valve.
- the pressure-controlled 2-way flow control valve is characterized in that a pressure signal falsifying the first or second pressure signal is applied to the 2-way flow control valve via a second tap in the open or closed direction over at least part of the control stroke of the 2-way flow control valve becomes.
- the corruptive pressure signal is applied only over part of the control stroke of the 2-way flow control valve.
- a partial vaccination of the characteristic of the 2-way flow control valve is achieved, which is effective in at least a certain portion of the control stroke.
- the falsifying pressure signal in the part of the control stroke which picks up the falsifying pressure signal is applied to the 2-way flow control valve via a first nozzle or a first diaphragm in open or closed control direction.
- a degree of vaccination can be easily defined.
- the 2-way flow control valve further comprises a second nozzle or aperture connected in series with the first nozzle or aperture, the adulterated pressure signal being across a control port located between the nozzles or orifices is applied to the 2-way flow control valve.
- the second tap on the 2-way flow control valve is arranged on the input side. This represents a structurally simple way to provide the pressure vaccination.
- the falsifying pressure signal is applied in the open-control direction so that as the difference between the first pressure signal and the second pressure signal increases on the output side, an increasing volume flow adapts to the 2-way flow control valve.
- a corresponding volume flow control has a dampening effect on pressure fluctuations occurring in the hydraulic system.
- the falsifying pressure signal is applied in the on-control direction so that as the difference between the first pressure signal and the second pressure signal increases on the output side, a decreasing volume flow adapts to the 2-way flow control valve.
- This can optionally achieve a desired overcompensation. This causes instabilities in the hydraulic system at certain operating points, e.g. in the power limitation range lead to a power limitation of the pump, stabilized.
- the second tap is arranged on the output side of the 2-way flow control valve and the falsifying pressure signal is applied in the open control direction.
- control stroke has a passage section and a blocking section in which no volume flow occurs on the output side of the 2-way flow control valve, wherein the distorting pressure signal in the passage section is applied to the 2-way flow control valve only over part of the control stroke. This allows a vaccination that occurs only over a portion of the control stroke.
- the 2-way flow control valve is configured such that the falsifying pressure signal is blocked only over part of the control stroke.
- unvaccinated control in a control range is possible.
- a pressure-independent volume flow control over a part of the control stroke is maintained.
- valve assembly for hydraulic applications.
- the valve assembly comprises a proportional directional spool for controlling a hydraulic consumer and a 2-way flow control valve according to the first aspect of the invention as described above, wherein the 2-way flow control valve is connected on the output side to the proportional directional spool valve.
- a valve assembly for hydraulic applications.
- the valve assembly includes a proportional directional spool for controlling a hydraulic consumer and a 2-way flow control valve according to the first aspect of the invention as described above, wherein the 2-way flow control valve is connected on the input side to the proportional directional spool valve.
- the proportional directional spool is integrated with the 2-way flow control valve in a valve block. This provides an advantageous compact design for valve assemblies according to the second or third aspect.
- Fig. 2a schematically shows a valve assembly according to an illustrative embodiment of the invention.
- the valve assembly includes a valve block 110 and a port block 120 connected to the valve block 110.
- the connection block 120 has a pilot pressure regulating valve 122 and can be connected to a constant pump system (not shown; Fig. 1a ) or alternatively connected to a control pump system (not shown).
- the valve block 110 may have a proportional directional spool 112 and a two-way flow control valve 130 arranged in the supply line upstream of the proportional directional spool 112.
- the proportional directional slide 112 is z. B. connected to two load ports A and B of the valve block 110, which may be connected to a consumer (not shown), such as a hydraulic cylinder.
- the 2-way flow control valve 130 has a biasing element F, for example a spring, an input-side supply connection 132, an output-side output connection 134, a first control connection 136, which is connected to a first tap of the 2-way flow control valve 130 which is connected to the 2-way flow control valve 130.
- Flow control valve 130 is arranged on the output side, is connected, and a second control terminal 138, which is connected to a LS-pressure line 114.
- the first control port 136 is connected to the first tap of the 2-way flow control valve 130, so that a tapped by the first tap pressure signal via the first control port 136 acts on the 2-way flow control valve 130 such that the pressure signal from one of the biasing element F counteracts generated bias.
- a pressure signal applied to the 2-way flow control valve 130 through the LS line 114 via the second pressure port 138 assists the bias voltage generated by the biasing element F.
- the 2-way flow control valve 130 further has a second tap arranged on the input side, by means of which a pressure signal in the supply line before the 2-way flow control valve 130 tapped with the pressure signal in the in Fig. 2a shown valve state via a nozzle D1, or alternatively a diaphragm, the first control port 136 is supplied.
- the nozzle D1 is connected to the first tap and / or the first control connection 136 over at least a portion of the control stroke of the two-way flow control valve.
- the 2-way flow control valve 130 is biased in the open control direction by the biasing element F and a pressure medium applied to the second control port 138, while pressure signals supplied to the first control port 136 via the first and second taps are in the on-control direction Act.
- the first tap is connected to the first control port 136 via a second nozzle D2 regardless of the valve position of the 2-way flow control valve. Is the 2-way flow control valve 130 in the in Fig. 2a shown switching position, a pressure signal p P is tapped at the input side supply terminal 132.
- a vaccination of the 2-way flow control valve 130 can now be effected by the pressure signal p P such that the pressure signal applied to the first control port 136 is determined by the pressure signal p P , as described below Fig. 3a will be described in more detail.
- an open-control direction refers to a control direction of the 2-way flow control valve along which the 2-way flow control valve is opened.
- a control direction to be understood is a control direction of the 2-way flow control valve, along which the 2-way flow control valve is closed.
- the 2-way flow control valve 130 thus provides a pressure-controlled pressure compensator in which a falsifying pressure signal is applied by the second tap at least over a partial section of the stroke in Zu-control direction or to the first control terminal 136.
- a flow force F flow acting on the control piston does not enter due to the pressure difference occurring at the control piston and the volume flow.
- the flow force F flow increases linearly with increasing volume flow up to a maximum value and decreases from the maximum value hyperbolic, so that the flow force F flow under certain circumstances make up a significant proportion of the equilibrium of forces and would then no longer be negligible without tolerable errors.
- Fig. 2b The resulting characteristic for the 2-way flow control valve 130 off Fig. 2a , in which the difference (pump pressure - p LS ) is plotted against the volume flow, is in Fig. 2b shown schematically, wherein the vertical characteristic curve of conventional 2-way flow control valves (see. Fig. 1 b) is indicated as a dashed line.
- the characteristic of the 2-way flow control valve 130 is according to the in Fig. 2a illustrated illustrative embodiment with respect to the vertical course of conventional characteristics inclined to the left.
- FIG. 12 schematically illustrates a flow passage sectional area of the flow control valve along a control stroke according to an embodiment of the present invention.
- the course of the flow cross-sectional area at the control edge through the 2-way flow control valve 130 (see curve 1) and at the nozzle D1 (see curve 2) along a stroke H1 of the control piston is shown schematically.
- the profile of the flow cross-sectional area of the nozzle D1 over a portion of the stroke H1 is constant and then goes to zero.
- Fig. 3a schematically shows a valve assembly according to further illustrative embodiments of the invention.
- the valve assembly includes a valve block 210 and a port block 220 connected to the valve block 210.
- the connection block 220 has a pilot pressure regulating valve 222 and can be connected to a constant pump system (not shown; Fig. 1a ) or alternatively connected to a control pump system (not shown).
- Valve block 210 includes a proportional directional spool 212 and a two-way flow control valve 230 disposed in the supply line ahead of proportional directional spool 212.
- Proportional displacement spool 112 is connected, for example, to two load ports A and B of valve block 210 connected to a consumer (not shown), such as a hydraulic cylinder may be connected.
- the 2-way flow control valve 230 has a biasing element F, an input side arranged first supply port 232, an output side arranged output port 234, a first control port 236, with a first tap of the 2-way flow control valve 230, the 2-way flow control valve 230 is arranged on the output side, and a second control terminal 238, which is connected to a LS-pressure line 214.
- the first control port 236 is connected to the first tap of the 2-way flow control valve 230 so that a pressure signal tapped by the first tap acts on the 2-way flow control valve 230 via the first control port 236 such that the one indicated by the first tap Pressure signal one of the biasing element F, eg a spring, counteracts generated bias.
- a pressure signal applied to the 2-way flow control valve 230 through the LS line 214 via the second pressure port 238 supports the bias voltage generated by the biasing element F.
- the 2-way flow control valve 230 further comprises a second tap arranged on the input side, by means of which a pressure signal in the supply line is tapped before the 2-way flow control valve 230, wherein the pressure signal in the in Fig. 3a illustrated valve state via a nozzle D3, or alternatively a diaphragm, the second control terminal 238 is supplied.
- the nozzle D3 is connected to the first tap and / or the second control connection 238 over at least a portion of the control stroke of the 2-way flow control valve.
- the 2-way flow control valve 230 is biased in the open-control direction by the biasing element F and a pressure medium applied to the second control port 238, while pressure signals reported to the first control port 236 from the first tap are in the on-control direction.
- the pressure p B represents the pressure signal reported by the first taps (F F denotes the spring force, as with respect to FIG Fig. 2a above). Furthermore, a load pressure signal p LS is picked off at the point M1 or M2, depending on the switching position of the proportional directional spool 212. When inoculation of the 2-way flow control valve 230 is active, p LS acts between the load ports and the nozzle D4, otherwise to the control port 238 in the case of inactive vaccination. As will be explained below, the ratio between p LS and p A is given by the nozzles D3 and D4.
- the volume flow through the 2-way flow control valve 230 decreases.
- the pressure difference (p B - p A ) decreases, ie the pressure p A increases slightly or the pressure p B decreases slightly.
- the equilibrium of forces is compared with the in Fig. 1a shown known pressure balance shifted in the open-control direction, so that the 2-way flow control valve 230 is opened further and thus more volume flow through the 2-way flow control valve 230 passes.
- the 2-way flow control valve 230 thus represents a pressure-controlled pressure compensator, wherein a falsifying pressure signal is applied by the second tap at least over a portion of the stroke in up-control direction or to the second control port 238, in particular, the flow is not constant Value regulated.
- this can be adjusted according to exemplary embodiments by the nozzle D3 and the nozzle D4 connected in series therewith.
- a control of the 2-way flow control valve 230 without the second tap, by a falsifying pressure signal acts in addition to the tapped from the first tap pressure signal in Zu-control direction to the 2-way flow control valve 230 in the open-control direction be done in such a way that (compared to the in Fig. 3a illustrated embodiment) would pass less volume flow and the pressure difference in the equilibrium of forces to a (comparatively) lower constant value.
- Fig. 3b The resulting characteristic for the 2-way flow control valve 230 off Fig. 3a , in which the difference (pump pressure - p LS ) is plotted against the volume flow, is in Fig. 3b shown schematically, wherein the vertical characteristic curve of conventional 2-way flow control valves (see. Fig. 1b ) is indicated as a dashed line.
- the characteristic of the 2-way flow control valve 230 is according to the in Fig. 3a illustrated illustrative embodiment with respect to the vertical course of conventional characteristics inclined to the right.
- FIG. 12 schematically illustrates a flow passage sectional area of the flow control valve along a control stroke according to an embodiment of the present invention.
- the course of the flow cross-sectional area at the control edge is along the two-way flow control valve 230 (see curve 3) and at the nozzle D3 (see curve 4) Hubs H2 of the control piston shown schematically.
- the passage cross-sectional area of the nozzle D3 is constant over a portion of the stroke H2 and then approaches zero.
- FIGS. 3a to 3c described example embodiments can be, for example, make a transition from a sub-supply state of the 2-way flow control valve 230 to a sufficient supply state of the 2-way flow control valve 230 without sudden pressure shock, since due to the falsifying pressure signal, a proportional equalization between one at 2-way -Stromregelventil 230 occurring pressure difference and a flowing through the valve volume flow results. In contrast occurs in valves with a vertical curve at the transition to a sudden pressure shock.
- Fig. 4a shows a valve assembly according to further illustrative embodiments of the invention.
- a valve arrangement is shown schematically, which comprises a valve block 310 and a connection block 320 which is connected to the valve block 310.
- the connection block 320 has a pilot pressure regulating valve 322 and can be connected to a constant pump system (not shown; Fig. 1a ) or alternatively connected to a control pump system (not shown).
- Valve block 310 further includes a proportional directional spool 312 and a 2/3-way flow control valve 330 disposed in the supply line ahead of proportional directional spool 312.
- Proportional displacement spool 312 is connected, for example, to two load ports A and B of valve block 310 connected to a consumer (not shown), such as a hydraulic cylinder.
- the 2/3-way flow control valve 330 has, according to the in Fig. 4a 1, a biasing element F, an input side arranged first supply port 332, an output side arranged output port 334, a first control port 336, with a first tap of the 2/3-way flow control valve 330, the output side of the 2/3-way flow control valve 330 is connected, and a second control terminal 338, which is connected to a LS-pressure line 314.
- the first control port 336 is connected to the first tap of the 2/3-way flow control valve 330, so that a tapped by the first tap pressure signal via the first control port 336 acts on the 2/3-way flow control valve 330, that of counteracts the first tap reported pressure signal generated by a biasing element F, such as a spring bias.
- a biasing element F such as a spring bias.
- This in Fig. 4a shown 2/3-way flow control valve 330 further has an output side arranged second tap, so that an output side tapped falsifying pressure signal is supplied to the second control terminal 338 via a nozzle D5.
- the second tap may be provided on the input side, to supply the second control terminal 338 a falsifying pressure signal tapped on the input side via the nozzle D5.
- the pressure reported via the nozzle D5 can be adjusted, for example, via a nozzle chain with a nozzle D6, as described above.
- the second control terminal 338 is supplied with an adulterated pressure signal in addition to the LS pressure signal reported at the second control terminal 338, which is applied to the 2/3-way flow control valve via the second tap to support the bias in the open control direction. This is true in a Fig. 4a illustrated valve state a.
- a connection between the second tap and the second control port 338 is separated, while a passage (or an opening cross-section , not shown) between the input side and the output side of the 2/3-way flow control valve is maintained.
- valve state c which corresponds to a further deflection of the 2/3-way flow control valve 330 from the valve state b in the Zu-control direction out, the valve is closed in both the passage direction and in a connection between the second tap and the second control terminal 338 ,
- the 2/3-way flow control valve in valve state c may be fully deflected in the on-control direction.
- the adulterated pressure signal picked up at the second tap is reported to the second control port 338 only over a portion of the control stroke in the open control direction. Consequently, a "seeding" of the 2/3-way flow control valve 330 takes place only over a portion of the control stroke. It is thus achieved a better utilization of the corner power in the range of small pressure differences or small volume flows and in Fig. 4a illustrated 2/3-way flow control valve 330 reaches a relatively lower pressure difference at the same amount compared to conventional 2-way flow control valves. Furthermore, a volume flow control in the range of low pressure differences can be made more accurate.
- Fig. 4b schematically shows the course of a characteristic of the in Fig. 4a 2/3-way flow control valve 330 shown, wherein a characteristic curve of conventional 2-way flow control valves (see, for example, 130 in Fig. 1a ) is indicated for comparison with a dashed line. It is off Fig. 4b It can be seen that in the 2/3-way flow control valve 330 as shown in FIG Fig. 4a a faster entry into the regular curve section (see RK in Fig. 1 b) takes place, in particular, is the 2/3-way flow control valve 330 according to the in Fig. 4a illustrated embodiment compared to conventional 2-way flow control valves even at smaller pressure differences in the Ausregel Symposium Symposium, as in Fig. 4b indicated by the mark d.
- Fig. 4c schematically shows a profile of the flow cross-sectional area between control edges in the 2/3-way flow control valve Fig. 4a along a control stroke H3 of the 2/3-way flow control valve 330 (see. Fig. 4a ).
- the nozzle D5 is opened only over a partial section of the control stroke, in particular along a partial section T1, which is smaller than a partial section T2, along which the 2/3-way flow control valve 330 (see FIG. Fig. 4a ) is opened in the forward direction.
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- Multiple-Way Valves (AREA)
Abstract
Die Efindung stellt in einem ersten Aspekt ein druckgesteuertes 2-Wege-Stromregelventil für Hydraulikanwendungen bereit, wobei ein erstes Drucksignal über eine erste ausgangsseitige Anzapfung in Zu-Steuerrichtung des 2-Wege-Stromregelventils und ein zweites Drucksignal über eine LS-Druckmeldeleitung in Auf-Steuerrichtung an das 2-Wege-Stromregelventil angelegt werden. Hierbei wird ein das erste oder zweite Drucksignal verfälschendes Drucksignal über eine wenigstens über einen Teil des Regelhubs des 2-Wege-Stromregelventils wirksame zweite Anzapfung in einem Teil des Regelhubs des 2-Wege-Stromregelventils in Zu- oder Auf-Steuerrichtung an das 2-Wege-Stromregelventil angelegt.The Efindung provides in a first aspect, a pressure-controlled 2-way flow control valve for hydraulic applications, wherein a first pressure signal via a first output-side tap in Zu-control direction of the 2-way flow control valve and a second pressure signal via a LS-Druckmeldeleitung in open-control direction be applied to the 2-way flow control valve. Here, a pressure signal distorting the first or second pressure signal is applied to the 2-way via a second tap effective in at least part of the control stroke of the 2-way flow control valve in a part of the control stroke of the 2-way flow control valve in open or closed control direction -Stromregelventil applied.
Description
Die vorliegende Erfindung betrifft druckgesteuerte 2-Wege-Stromregelventile für Hydraulikanwendungen und Ventilanordnungen für Hydraulikanwendungen, die ein entsprechendes 2-Wege-Stromregelventil aufweisen.The present invention relates to pressure controlled 2-way flow control valves for hydraulic applications and valve assemblies for hydraulic applications having a corresponding 2-way flow control valve.
In anspruchsvollen Hydrokreisen, bspw. von Kränen, Betonverteilermasten und anderen Lasthebe- und Manipuliereinrichtungen, werden im Allgemeinen Proportional-Wegeschieber eingesetzt, um das gleichzeitige Betätigen mehrerer Verbraucher zu ermöglichen. In der Anwendungspraxis ist es dabei häufig erforderlich, mehrere Verbraucher völlig individuell und gleichzeitig anzusteuern, wobei dies möglichst lastdruckunabhängig geschehen soll.In demanding hydraulic circuits such as cranes, concrete boom and other lifting and manipulating devices, proportional directional shifters are generally used to enable simultaneous operation of multiple consumers. In practice, it is often necessary to control several consumers completely individually and simultaneously, which should be done as independent of load pressure as possible.
Aus dem Produktprogramm 2011 von HAWE ist gemäß den Seiten 98 bis 101 ein Proportional-Wegeschieber vom Typ PSL mit Anschlussblöcken und Aufsatzblock bekannt. Mit Bezug auf
Über eine entsprechende LS-Leitung LS1, LS2 (in
Der von der LS-Leitung LS1 bzw. LS2 an das 2-Wege-Stromregelventil 41 bzw. 42 gemeldete Lastdruck wird, die Vorspannung der Vorspannfeder unterstützend, in Auf-Richtung des 2-Wege-Stromregelventils 41 bzw. 42 wirkend an dieses angelegt. Weiterhin wird jedem 2-Wege-Stromregelventil 41, 42 ferner ein ausgangsseitig am jeweiligen 2-Wege-Stromregelventil 41, 42 abgegriffenes Drucksignal in Zu-Steuerrichtung (d.h. der Vorspannung entgegenwirkend) des jeweiligen 2-Wege-Stromregelventil 41, 42 angelegt. Jedes der 2-Wege-Stromregelventile 41, 42 wird durch eine Vorspannfeder in Auf-Richtung vorgespannt, so dass die 2-Wege-Stromregelventile 41, 42 im Ruhezustand geöffnet sind.The load pressure reported by the LS line LS1 or LS2 to the 2-way
In der Gleichgewichtslage stellt sich folglich eine bestimmte Druckdifferenz zwischen dem abgegriffenen LS-Druck und einem Drucksignal entsprechend dem abgegriffenen ausgangsseitigen Druck des 2-Wege-Stromregelventils ein. Hierdurch werden Änderungen im Volumenstrom im Fall von Federn mit kleiner Federkonstante bzw. flacher Federkennlinie auf einen konstanten Wert einregelt. Demnach regelt jedes der 2-Wege-Stromregelventil 41, 42 einen Volumenstrom durch den entsprechenden Proportional-Wegeschieber PS1, PS2 lastunabhängig auf einen konstanten Wert ein. Mit anderen Worten, falls der hinter dem Proportional-Wegeschieber PS1 bzw. PS2 auftretende Volumenstrom während des Betriebs des Verbrauchers V1 bzw. V2 sinkt, so sinkt auch die Druckdifferenz zwischen dem hinter dem 2-Wege-Stromregelventil 41 bzw. 42 abfallenden Druck (gemeldet als "pA") und dem hinter dem Proportional-Wegeschieber abfallenden Lastdruck (der als "pLS" über die LS-Leitung LS1 bzw. LS2 an das 2-Wege-Stromregelventil 41 bzw. 42 gemeldet wird), so dass sich ein Regelkolben (nicht dargestellt) im 2-Wege-Stromregelventil 41 bzw. 42 entlang der Auf-Steuerrichtung verschiebt. Die Folge ist, dass sich am Regelkolben im 2-Wege-Stromriegelventil 41 bzw. 42 wieder ein Kräftegleichgewicht einstellt, wenngleich bei einem größeren Drosselquerschnitt im 2-Wege-Stromregelventil 41 bzw. 42, so dass die Verringerung des Volumenstroms und der Druckdifferenz (pA - pLS) kompensiert. Es werden also der Volumenstrom zum Verbraucher und die Druckdifferenz zwischen dem von der Konstantpumpe 1 bereitgestellten Druck und dem Druck im Lastkreis zum Verbraucher auf einen konstanten Wert geregelt. Nimmt andererseits die Druckdifferenz (pA - pLS) am Proportional-Wegeschieber PS1 bzw. PS2 zu, was einer Zunahme des Volumenstroms entspricht, so wird das 2-Wege-Stromregelventil in Zu-Richtung geregelt, bis sich ein neues Kräftegleichgewicht einstellt. Im-2-Wege-Stromregelventil verschiebt sich ein Regelkolben (nicht dargestellt) in Zu-Steuerrichtung, wodurch sich ein Drosselquerschnitt im 2-Wege-Stromregelventil 41 bzw. 42 verringert. Mit abnehmendem Drosselquerschnitt nehmen aber der Volumenstrom und die Druckdifferenz (pA - pLS) wieder ab (der anfängliche Zunahme entgegenwirkend), bis sich wiederum ein Kräftegleichgewicht einstellt.In the equilibrium position, therefore, a certain pressure difference between the tapped LS pressure and a pressure signal corresponding to the tapped output-side pressure of the 2-way flow control valve is established. As a result, changes in the flow rate in the case of springs with a small spring constant or flat spring characteristic are adjusted to a constant value. Accordingly, each of the two-way
In
Es besteht die Aufgabe eine von der vorangehend beschriebenen lastunabhängigen Volumenstromregelung abweichende Volumenstromregelung bereitzustellen, die zur Verbesserung einer Variabilität von Hydraulikkreisen, abhängig vom konkreten Anwendungsfall, eine lastabhängige Volumenstromregelung erlaubt. Zum Beispiel kann es in einigen Anwendungen für ein "gutes Bediengefühl" durchaus erwünscht sein, den Volumenstrom lastabhängig zu regeln, um einem Benutzer ein "Belastungsgefühl" zu vermitteln.It is an object to provide a volume flow control deviating from the above-described load-independent volume flow control, which allows a load-dependent volume flow control to improve a variability of hydraulic circuits, depending on the specific application. For example, in some "good feel" applications, it may well be desirable to control the flow rate load-dependent to give a user a "feeling of stress".
Es besteht beispielsweise die Aufgabe, ein 2-Wege-Stromregelventil und eine Ventilanordnungen mit einem entsprechenden 2-Wege-Stromregelventilen bereitzustellen, wobei die Volumenstromregelung in den Betriebspunkten stabilisiert wird, speziell im Zusammenspiel mit anderen hydraulischen Reglern, und/oder eine genauere Volumenstromregelung im niedrigeren Druckdifferenzbereich ermöglicht wird.It is, for example, the object to provide a 2-way flow control valve and a valve assemblies with a corresponding 2-way flow control valves, wherein the flow control is stabilized in the operating points, especially in interaction with other hydraulic controllers, and / or a more accurate flow control in the lower Pressure difference range is enabled.
Die vorangehenden Aufgaben und Probleme werden in einem ersten Aspekt der Erfindung durch ein druckgesteuertes 2-Wege-Stromregelventil für Hydraulikanwendungen gelöst. Gemäß anschaulicher Ausführungsformen werden ein erstes Drucksignal über eine erste ausgangsseitige Anzapfung in Zu-Steuerrichtung des 2-Wege-Stromregelventils und ein zweites Drucksignal über eine LS-Druckmeldeleitung in Auf-Steuerrichtung an das 2-Wege-Stromregelventil angelegt. Das druckgesteuerte 2-Wege-Stromregelventil ist dadurch gekennzeichnet, dass ein das erste oder zweite Drucksignal verfälschendes Drucksignal über eine wenigstens über einen Teil des Regelhubs des 2-Wege-Stromregelventils wirksame zweite Anzapfung in Zu- oder AufSteuerrichtung an das 2-Wege-Stromregelventil angelegt wird.The foregoing objects and problems are solved in a first aspect of the invention by a pressure controlled 2-way flow control valve for hydraulic applications. According to illustrative embodiments, a first pressure signal is applied via a first output-side tap in the Zu-control direction of the 2-way flow control valve and a second pressure signal via a LS-Druckmeldeleitung in up-control direction to the 2-way flow control valve. The pressure-controlled 2-way flow control valve is characterized in that a pressure signal falsifying the first or second pressure signal is applied to the 2-way flow control valve via a second tap in the open or closed direction over at least part of the control stroke of the 2-way flow control valve becomes.
Durch das verfälschende Drucksignal wird eine Impfung einer durch das 2-Wege-Stromregelventil bereitgestellten Kennlinie erreicht, so dass die Kennlinie des geimpften Stromregelventils im Regelkurvenabschnitt einen vom vertikalen Verlauf (vgl.
In einer weiteren anschaulichen Ausführungsform wird das verfälschende Drucksignal lediglich über einen Teil des Regelhubs des 2-Wege-Stromregelventils angelegt. Dadurch wird eine abschnittsweise Impfung der Kennlinie des 2-Wege-Stromregelventils erreicht, die in wenigstens einem bestimmten Abschnitt des Regelhubs wirksam ist.In another illustrative embodiment, the corruptive pressure signal is applied only over part of the control stroke of the 2-way flow control valve. Thereby, a partial vaccination of the characteristic of the 2-way flow control valve is achieved, which is effective in at least a certain portion of the control stroke.
In einer vorteilhafteren Ausgestaltung hierin wird das verfälschende Drucksignal in dem das verfälschende Drucksignal abgreifenden Teil des Regelhubs über eine erste Düse oder eine erste Blende in Zu- oder Auf-Steuerrichtung an das 2-Wege-Stromregelventil angelegt. Durch die erste Düse oder erste Blende kann ein Maß an Impfung auf leichte Weise definiert werden.In a more advantageous embodiment herein, the falsifying pressure signal in the part of the control stroke which picks up the falsifying pressure signal is applied to the 2-way flow control valve via a first nozzle or a first diaphragm in open or closed control direction. Through the first nozzle or first orifice, a degree of vaccination can be easily defined.
In einer weiteren anschaulichen Ausführungsform der Erfindung umfasst das 2-Wege-Stromregelventil ferner eine zweite Düse oder eine zweite Blende, die mit der ersten Düse oder der ersten Blende in Reihe geschaltet ist, wobei das verfälschende Drucksignal über einen zwischen den Düsen oder Blenden angeordneten Steueranschluss an das 2-Wege-Stromregelventil angelegt wird. Durch die entsprechend gebildete Reihenschaltung aus zwei Blenden, zwei Düsen oder einer Blende und einer Düse, wird eine vorteilhafte Einstellung des Impfdrucks am 2-Wege-Stromregelventil erreicht.In a further illustrative embodiment of the invention, the 2-way flow control valve further comprises a second nozzle or aperture connected in series with the first nozzle or aperture, the adulterated pressure signal being across a control port located between the nozzles or orifices is applied to the 2-way flow control valve. By appropriately formed series connection of two diaphragms, two nozzles or a diaphragm and a nozzle, an advantageous adjustment of the injection pressure is achieved at the 2-way flow control valve.
In einer weiteren anschaulichen Ausführungsform der Erfindung ist die zweite Anzapfung am 2-Wege-Stromregelventil eingangsseitig angeordnet. Dies stellt eine konstruktiv einfache Weise zum Vorsehen der Druckimpfung dar.In a further illustrative embodiment of the invention, the second tap on the 2-way flow control valve is arranged on the input side. This represents a structurally simple way to provide the pressure vaccination.
In einer anschaulichen Ausgestaltung hierin wird das verfälschende Drucksignal in Auf-Steuerrichtung angelegt, so dass sich bei zunehmender Differenz zwischen dem ersten Drucksignal und dem zweiten Drucksignal ausgangsseitig am 2-Wege-Stromregelventil ein zunehmender Volumenstrom einregelt. Eine entsprechende Volumenstromregelung wirkt sich dämpfend auf im Hydrauliksystem auftretende Druckschwankungen aus.In one illustrative embodiment herein, the falsifying pressure signal is applied in the open-control direction so that as the difference between the first pressure signal and the second pressure signal increases on the output side, an increasing volume flow adapts to the 2-way flow control valve. A corresponding volume flow control has a dampening effect on pressure fluctuations occurring in the hydraulic system.
In einer anderen anschaulichen Ausgestaltung hierin wird das verfälschende Drucksignal in Zu-Steuerrichtung angelegt, so dass sich bei zunehmender Differenz zwischen dem ersten Drucksignal und dem zweiten Drucksignal ausgangsseitig am 2-Wege-Stromregelventil ein abnehmender Volumenstrom einregelt. Dadurch lässt sich gegebenenfalls eine erwünschte Überkompensation erreichen. Hierdurch werden Instabilitäten im Hydrauliksystem an gewissen Betriebspunkten, die z.B. im Leistungsbegrenzungsbereich zu einer Leistungsbegrenzung der Pumpe führen, stabilisiert.In another illustrative embodiment herein, the falsifying pressure signal is applied in the on-control direction so that as the difference between the first pressure signal and the second pressure signal increases on the output side, a decreasing volume flow adapts to the 2-way flow control valve. This can optionally achieve a desired overcompensation. This causes instabilities in the hydraulic system at certain operating points, e.g. in the power limitation range lead to a power limitation of the pump, stabilized.
In einer weiteren anschaulichen Ausführungsform der vorliegenden Erfindung ist die zweite Anzapfung ausgangsseitig am 2-Wege-Stromregelventil angeordnet und das verfälschende Drucksignal wird in Auf-Steuerrichtung angelegt. Hierdurch lässt sich eine Energieoptimierung dahingehend erreichen, dass eine verhältnismäßig kleine Druckdifferenz ausreicht, um einen Volumenstrom auf einen konstanten Wert zu regeln, wodurch sich die Regelgüte verbessert und demgemäß eine genauere Volumenstromregelung schon bei kleinen Druckdifferenzen ermöglicht wird. Weiterhin ist ein Volumenstrom zu einer vorgegebenen Druckdifferenz höher als im Vergleich zu einem 2-Wege-Stromregelventil mit herkömmlicher Kennlinie.In a further illustrative embodiment of the present invention, the second tap is arranged on the output side of the 2-way flow control valve and the falsifying pressure signal is applied in the open control direction. As a result, an energy optimization can be achieved such that a relatively small pressure difference is sufficient to control a volume flow to a constant value, whereby the control quality improves and accordingly a more accurate flow control is made possible even at small pressure differences. Furthermore, a volume flow to a predetermined pressure difference is higher than compared to a 2-way flow control valve with a conventional characteristic.
In einer anschaulichen Ausgestaltung hierin weist der Regelhub einen Durchlassabschnitt und einen Sperrabschnitt auf, in dem am 2-Wege-Stromregelventil ausgangsseitig kein Volumenstrom auftritt, wobei das verfälschende Drucksignal im Durchlassabschnitt nur über einen Teil des Regelhubs an das 2-Wege-Stromregelventil angelegt wird. Dies erlaubt eine Impfung, die nur über einen Teilabschnitt des Regelhubs auftritt.In one illustrative embodiment, the control stroke has a passage section and a blocking section in which no volume flow occurs on the output side of the 2-way flow control valve, wherein the distorting pressure signal in the passage section is applied to the 2-way flow control valve only over part of the control stroke. This allows a vaccination that occurs only over a portion of the control stroke.
In einer weiteren anschaulichen Ausführungsform der Erfindung ist das 2-WegeStromregelventil derart konfiguriert, dass das verfälschende Drucksignal nur über einen Teil des Regelhubs gesperrt ist. Dadurch ist eine ungeimpfte Regelung in einem Regelbereich möglich. Hierbei wird eine druckunabhängige Volumenstromregelung über einen Teil des Regelhubs aufrechterhalten.In a further illustrative embodiment of the invention, the 2-way flow control valve is configured such that the falsifying pressure signal is blocked only over part of the control stroke. As a result, unvaccinated control in a control range is possible. In this case, a pressure-independent volume flow control over a part of the control stroke is maintained.
In einem zweiten Aspekt der vorliegenden Erfindung wird eine Ventilanordnung für Hydraulikanwendungen bereitgestellt. In anschaulichen Ausführungsformen der Erfindung umfasst die Ventilanordnung einen Proportional-Wegeschieber zur Steuerung eines Hydroverbrauchers und ein 2-Wege-Stromregelventil gemäß dem vorangehend beschriebenen ersten Aspekt der Erfindung, wobei das 2-Wege-Stromregelventil ausgangsseitig mit dem Proportional-Wegeschieber verbunden ist.In a second aspect of the present invention, a valve assembly for hydraulic applications is provided. In illustrative embodiments of the invention, the valve assembly comprises a proportional directional spool for controlling a hydraulic consumer and a 2-way flow control valve according to the first aspect of the invention as described above, wherein the 2-way flow control valve is connected on the output side to the proportional directional spool valve.
In einem dritten Aspekt der vorliegenden Erfindung wird eine Ventilanordnung für Hydraulikanwendungen bereitgestellt. In anschaulichen Ausführungsformen der Erfindung umfasst die Ventilanordnung einen Proportional-Wegeschieber zur Steuerung eines Hydroverbrauchers und ein 2-Wege-Stromregelventil gemäß dem vorangehend beschriebenen ersten Aspekt der Erfindung, wobei das 2-Wege-Stromregelventil eingangsseitig mit dem Proportional-Wegeschieber verbunden ist.In a third aspect of the present invention, a valve assembly for hydraulic applications is provided. In illustrative embodiments of the invention, the valve assembly includes a proportional directional spool for controlling a hydraulic consumer and a 2-way flow control valve according to the first aspect of the invention as described above, wherein the 2-way flow control valve is connected on the input side to the proportional directional spool valve.
In einer anschaulichen Ausführungsform des zweiten oder dritten Aspekts ist der Proportional-Wegeschieber zusammen mit dem 2-Wege-Stromregelventil in einen Ventilblock integriert. Dies stellt für Ventilanordnungen gemäß dem zweiten oder dritten Aspekt eine vorteilhafte kompakte Bauweise bereit.In one illustrative embodiment of the second or third aspect, the proportional directional spool is integrated with the 2-way flow control valve in a valve block. This provides an advantageous compact design for valve assemblies according to the second or third aspect.
Weitere vorteilhafte Ausgestaltungen der vorliegenden Erfindung werden nachfolgend mit Bezug auf die folgenden Figuren beschrieben, wobei:
- Fig. 1a
- schematisch eine bekannte Ventilanordnung mit 2-Wege-Stromregelventilen;
- Fig. 1 b
- die Kernlinie eines bekannten Stromregelventils schematisch darstellt;
- Fig. 2a
- schematisch eine Ventilanordnung gemäß einer Ausführungsform der vorliegenden Erfindung darstellt;
- Fig. 2b
- schematisch eine Kennlinie eines Stromregelventils gemäß einer Ausführungsform der vorliegenden Erfindung darstellt;
- Fig. 2c
- einen Verlauf einer Durchflussquerschnittfläche des Stromregelventils entlang eines Regelhubs gemäß einer Ausführungsform der vorliegenden Erfindung darstellt
- Fig. 3a
- schematisch eine Ventilanordnung gemäß einer weiteren anschaulichen Ausführungsform der Erfindung darstellt;
- Fig. 3b
- schematisch eine Kennlinie eines Stromregelventils gemäß einer weiteren Ausführungsform der vorliegenden Erfindung darstellt;
- Fig. 3c
- einen Verlauf einer Durchflussquerschnittfläche des Stromregelventils entlang eines Regelhubs gemäß einer Ausführungsform der vorliegenden Erfindung darstellt
- Fig. 4a
- schematisch eine Ventilanordnung gemäß einer anderen anschaulichen Ausführungsform der vorliegenden Erfindung darstellt;
- Fig. 4b
- schematisch eine Kennlinie eines Stromregelventils und einen Verlauf einer Durchflussquerschnittfläche des Stromregelventils entlang eines Regelhubs gemäß einer anderen Ausführungsform der vorliegenden Erfindung darstellt; und
- Fig. 4c
- einen Verlauf einer Durchflussquerschnittfläche des Stromregelventils entlang eines Regelhubs gemäß einer Ausführungsform der vorliegenden Erfindung darstellt.
- Fig. 1a
- schematically a known valve arrangement with 2-way flow control valves;
- Fig. 1 b
- schematically illustrates the core line of a known flow control valve;
- Fig. 2a
- schematically illustrates a valve assembly according to an embodiment of the present invention;
- Fig. 2b
- schematically illustrates a characteristic of a flow control valve according to an embodiment of the present invention;
- Fig. 2c
- FIG. 5 illustrates a profile of a flow cross-sectional area of the flow control valve along a control stroke according to an embodiment of the present invention. FIG
- Fig. 3a
- schematically illustrates a valve assembly according to another illustrative embodiment of the invention;
- Fig. 3b
- schematically illustrates a characteristic of a flow control valve according to another embodiment of the present invention;
- Fig. 3c
- FIG. 5 illustrates a profile of a flow cross-sectional area of the flow control valve along a control stroke according to an embodiment of the present invention. FIG
- Fig. 4a
- schematically illustrates a valve assembly according to another illustrative embodiment of the present invention;
- Fig. 4b
- schematically illustrates a characteristic of a flow control valve and a profile of a flow cross-sectional area of the flow control valve along a control stroke according to another embodiment of the present invention; and
- Fig. 4c
- FIG. 5 illustrates a profile of a flow cross-sectional area of the flow control valve along a control stroke according to an embodiment of the present invention. FIG.
Nachfolgend werden mit Bezug auf die beiliegenden Figuren verschiedene Aspekte und Ausgestaltungen der vorliegenden Erfindung in größerem Detail beschrieben.Hereinafter, various aspects and embodiments of the present invention will be described in more detail with reference to the accompanying drawings.
Gemäß der in
Das 2-Wege-Stromregelventil 130 weist ein Vorspannelement F, beispielsweise eine Feder, einen eingangsseitigen Versorgungsanschluss 132, einen ausgangsseitig Ausgangsanschluss 134, einen ersten Steueranschluss 136, der mit einer ersten Anzapfung des 2-Wege-Stromregelventils 130, die am 2-Wege-Stromregelventil 130 ausgangsseitig angeordnet ist, verbunden ist, und einen zweiten Steueranschluss 138 auf, der mit einer LS-Druckleitung 114 verbunden ist. Der erste Steueranschluss 136 ist mit der ersten Anzapfung des 2-Wege-Stromregelventils 130 verbunden, so dass ein durch die erste Anzapfung abgegriffenes Drucksignal über den ersten Steueranschluss 136 derart auf das 2-Wege-Stromregelventil 130 einwirkt, dass das Drucksignal einer vom Vorspannelement F erzeugten Vorspannung entgegenwirkt. Ein durch die LS-Leitung 114 über den zweiten Druckanschluss 138 an das 2-Wege-Stromregelventil 130 angelegtes Drucksignal unterstützt hingegen die von dem Vorspannelement F erzeugte Vorspannung.The 2-way
In der in
Gemäß der in
Im Allgemeinen bezeichnet eine Auf-Steuerrichtung eine Steuerrichtung des 2-Wege-Stromregelventils, entlang der das 2-Wege-Stromregelventil geöffnet wird. Im Gegensatz dazu ist unter einer Zu-Steuerrichtung eine Steuerrichtung des 2-Wege-Stromregelventils zu verstehen, entlang der das 2-Wege-Stromregelventil geschlossen wird.In general, an open-control direction refers to a control direction of the 2-way flow control valve along which the 2-way flow control valve is opened. In contrast, a control direction to be understood is a control direction of the 2-way flow control valve, along which the 2-way flow control valve is closed.
Unter der Annahme, dass Querschnittflächen von Regelkolben (nicht dargestellt) im 2-Wege-Stromregelventil 130 am ersten Steueranschluss 136 und am zweiten Steueranschluss 138 gleich sind (die Querschnittflächen sollen im Folgenden mit AK bezeichnet sein), gilt im Kräftegleichgewicht für das 2-Wege-Stromregelventil 130: (pP - pLS) = FF/AK, wobei der Druck pLS ein von der LS-Leitung 114 gemeldetes Drucksignal bezeichnet und das Drucksignal pP durch die von den ersten und zweiten Anzapfungen gemeldeten Drucksignale abhängig von den Parametern der Düsen D1, D2 gebildet wird (die Federkraft ist mit FF bezeichnet; im Allgemeinen setzt sich die Federkraft aus einer Federvorspannung FFV und, bei gegebener Federkonstanten cFeder, der aus einem Hub Δx der Feder resultierenden Kraft FHook = cFeder * Δx zusammen: FF = FFV + FHook). Sinkt nun der Lastdruck nach dem Proportional-Wegeschieber 112, so nimmt auch der Volumenstrom durch das 2-Wege-Stromregelventil 130 ab. Dies bedeutet, dass auch die Druckdifferenz (pP - pLS) abnimmt und folglich der Druck pLS etwas zunimmt bzw. der Druck pP etwas abnimmt. Das 2-Wege-Stromregelventil 130 stellt somit eine druckgesteuerte Druckwaage dar, wobei ein verfälschendes Drucksignal durch die zweite Anzapfung wenigstens über einen Teilabschnitt des Hubwegs in Zu-Steuerrichtung bzw. an den ersten Steueranschluss 136 angelegt wird.Assuming that cross-sectional areas of control pistons (not shown) in the two-way
In der obigen Betrachtung (wie auch an entsprechender Stelle in der Beschreibung zu
Im dargestellten Ventilzustand würde eine Regelung des 2-Wege-Stromregelventils ohne die zweite Anzapfung, durch die ein verfälschendes Drucksignal zusätzlich zu dem von der ersten Anzapfung abgegriffenen Drucksignal in Zu-Steuerrichtung auf das 2-Wege-Stromregelventil 130 einwirkt, in Auf-Steuerrichtung derart erfolgen, dass mehr Volumenstrom durchgelassen würde und sich die Druckdifferenz im Kräftegleichgewicht auf einen konstanten Wert einregelt. Aufgrund des verfälschenden Drucksignals, das durch die zweite Anzapfung jedoch in Zu-Steuerrichtung auf das 2-Wege-Stromregelventil 130 einwirkt, erfolgt eine Regelung des Steuerkolbens in Zu-Steuerrichtung, da das verfälschende Drucksignal, das durch die zweite Anzapfung abgegriffen wird, im Falle einer Druckminderung aufgrund eines abfallenden Volumenstroms bzw. eines Druckanstiegs im Lastkreis, der durch die LS-Leitung 114 gemeldet wird, das dem LS-Drucksignal entgegenwirkt. Dementsprechend wird der Regelkolben entlang der Zu-Steuerrichtung ausgelenkt und der Volumenstrom sinkt gegenüber dem Fall ohne verfälschendes Drucksignal ab, wird also insbesondere nicht auf einen konstanten Wert geregelt.In the illustrated valve state, a control of the 2-way flow control valve without the second tap, by a falsifying pressure signal in addition to the tapped from the first tap pressure signal in Zu-control direction acts on the 2-way
Die sich ergebende Kennlinie für das 2-Wege-Stromregelventil 130 aus
In
Gemäß der Darstellung in
Das 2-Wege-Stromregelventil 230 weist ein Vorspannelement F, einen eingangsseitig angeordneten ersten Versorgungsanschluss 232, einen ausgangsseitig angeordneten Ausgangsanschluss 234, einen ersten Steueranschluss 236, der mit einer ersten Anzapfung des 2-Wege-Stromregelventils 230, die am 2-Wege-Stromregelventil 230 ausgangsseitig angeordnet ist, verbunden ist, und einen zweiten Steueranschluss 238 auf, der mit einer LS-Druckleitung 214 verbunden ist. Der erste Steueranschluss 236 ist mit der ersten Anzapfung des 2-Wege-Stromregelventils 230 verbunden, so dass ein durch die erste Anzapfung abgegriffenes Drucksignal über den ersten Steueranschluss 236 derart auf das 2-Wege-Stromregelventil 230 einwirkt, dass das von der ersten Anzapfung gemeldete Drucksignal einer vom Vorspannelement F, z.B. eine Feder, erzeugten Vorspannung entgegenwirkt. Ein durch die LS-Leitung 214 über den zweiten Druckanschluss 238 an das 2-Wege-Stromregelventil 230 angelegtes Drucksignal unterstützt hingegen die vom Vorspannelement F erzeugte Vorspannung.The 2-way
In der in
Gemäß der in
Ähnlich zu der in
Sinkt nun der Lastdruck nach dem Proportional-Wegeschieber 212, nimmt der Volumenstrom durch das 2-Wege-Stromregelventil 230 ab. Mit Abnehmendem Lastdruck nimmt die Druckdifferenz (pB - pA) ab, d.h. der Druck pA nimmt etwas zu bzw. der Druck pB nimmt etwas ab. Durch das zusätzlich in Auf-Steuerrichtung wirkende verfälschende Drucksignal pA wird das Kräftegleichgewicht gegenüber der in
Hinsichtlich einer Einstellung des Drucksignals pA kann dies gemäß beispielhafter Ausgestaltungen durch die Düse D3 und der damit in Reihe geschalteten Düse D4 eingestellt werden. Allgemein ergibt sich bei in Reihe geschalteten Düsen bzw. einer Düsenkette (der Volumenstrom ist bei in Reihe geschalteten Düsen konstant) wenigstens näherungsweise, dass für ein Verhältnis von aus einem Druck vor der ersten Düse (hier D3; der Druck vor der Düse D3 sei mit pD3 bezeichnet) in der Reihe bzw. Kette zu einem Druck zwischen der ersten und zweiten Düse (hier D4; der Druck vor der Düse D4 sei mit pD4 bezeichnet) gilt: pD3/pD4 = (dD4/dD3)4 + 1, wobei dD4/dD3 den Durchmesser der Düse D3/D4 bezeichnet. An dieser Stelle sei darauf hingewiesen, dass entsprechendes für die Düsen D1 und D2 in
Im dargestellten Ventilzustand würde eine Regelung des 2-Wege-Stromregelventils 230 ohne die zweite Anzapfung, durch die ein verfälschendes Drucksignal zusätzlich zu dem von der ersten Anzapfung abgegriffenen Drucksignal in Zu-Steuerrichtung auf das 2-Wege-Stromregelventil 230 einwirkt, in Auf-Steuerrichtung derart erfolgen, dass (im Vergleich zu der in
Die sich ergebende Kennlinie für das 2-Wege-Stromregelventil 230 aus
In
Durch die hinsichtlich der
Das 2/3-Wege-Stromregelventil 330 weist gemäß der in
Das in
In einem Ventilzustand b, der einer Auslenkung des 2/3-Wege-Stromregelventils 330 aus dem Ventilzustand a in Zu-Steuerrichtung heraus entspricht, ist eine Verbindung zwischen der zweiten Anzapfung und dem zweiten Steueranschluss 338 getrennt, während ein Durchlass (bzw. ein Öffnungsquerschnitt, nicht dargestellt) zwischen der Eingangsseite und der Ausgangsseite des 2/3-Wege-Stromregelventils aufrechterhalten wird.In a valve state b, which corresponds to a deflection of the 2/3-way
In einem Ventilzustand c, der eine weiteren Auslenkung des 2/3-Wege-Stromregelventils 330 aus dem Ventilzustand b in Zu-Steuerrichtung heraus entspricht, ist das Ventil sowohl in Durchlaufrichtung als auch in einer Verbindung zwischen der zweiten Anzapfung und dem zweiten Steueranschluss 338 geschlossen. Gemäß einigen anschaulichen Beispielen kann das 2/3-Wege-Stromregelventil im Ventilzustand c vollständig in Zu-Steuerrichtung ausgelenkt sein.In a valve state c, which corresponds to a further deflection of the 2/3-way
Gemäß der dargestellten Ausführungsform wird das an der zweiten Anzapfung abgegriffene verfälschende Drucksignal lediglich über einen Teilbereich des Regelhubs in Auf-Steuerrichtung am zweiten Steueranschluss 338 gemeldet. Folglich erfolgt ein "Impfen" des 2/3-Wege-Stromregelventils 330 lediglich über einen Teilbereich des Regelhubs. Es wird damit eine bessere Ausnutzung der Eckleistung im Bereich kleiner Druckdifferenzen bzw. kleiner Volumenströme erreicht und das in
In den vorangehend anhand der Figuren beschriebenen Ausführungsformen ist von einem Proportional-Wegeschieber und einem Verbraucher die Rede. Dies stellt keine Beschränkung der vorliegenden Erfindung dar. Statt einem Verbraucher und einem Proportional-Wegeschieber können in Analogie zu der Darstellung in
Claims (13)
Priority Applications (2)
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EP15167276.3A EP3093504B1 (en) | 2015-05-12 | 2015-05-12 | Pressure controlled two-way flow control valve for hydraulics applications and valve assembly with a corresponding two-way flow control valve |
US15/152,668 US10550862B2 (en) | 2015-05-12 | 2016-05-12 | Pressure-controlled 2-way flow control valve for hydraulic applications and valve assembly comprising such a 2-way flow control valve |
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EP15167276.3A EP3093504B1 (en) | 2015-05-12 | 2015-05-12 | Pressure controlled two-way flow control valve for hydraulics applications and valve assembly with a corresponding two-way flow control valve |
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EP3093504A1 true EP3093504A1 (en) | 2016-11-16 |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE19855187A1 (en) * | 1998-11-30 | 2000-05-31 | Mannesmann Rexroth Ag | Method and control arrangement for controlling a hydraulic consumer |
DE102012220863A1 (en) * | 2012-11-15 | 2014-05-15 | Robert Bosch Gmbh | Control arrangement for driving e.g. hydraulic cylinder for e.g. hydraulic excavators, has control surface of pilot or primary stage of directly or servo-controlled lowering brake valve device acted upon by return control pressure |
EP2818732A1 (en) * | 2013-06-28 | 2014-12-31 | HAWE Hydraulik SE | Method and control for hydraulic lifting a load |
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US3866419A (en) * | 1973-09-06 | 1975-02-18 | Parker Hannifin Corp | Integrated pressure compensated load sensing system |
US3979907A (en) * | 1973-09-10 | 1976-09-14 | Parker-Hannifin Corporation | Priority control valve |
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Publication number | Priority date | Publication date | Assignee | Title |
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DE19855187A1 (en) * | 1998-11-30 | 2000-05-31 | Mannesmann Rexroth Ag | Method and control arrangement for controlling a hydraulic consumer |
DE102012220863A1 (en) * | 2012-11-15 | 2014-05-15 | Robert Bosch Gmbh | Control arrangement for driving e.g. hydraulic cylinder for e.g. hydraulic excavators, has control surface of pilot or primary stage of directly or servo-controlled lowering brake valve device acted upon by return control pressure |
EP2818732A1 (en) * | 2013-06-28 | 2014-12-31 | HAWE Hydraulik SE | Method and control for hydraulic lifting a load |
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US10550862B2 (en) | 2020-02-04 |
EP3093504B1 (en) | 2019-08-21 |
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