Source: https://patents.google.com/patent/DE102012006658A1/en
Timestamp: 2019-12-09 19:55:10
Document Index: 17068167

Matched Legal Cases: ['art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8', 'art 8']

DE102012006658A1 - Micro-pilot valve - Google Patents
Micro-pilot valve
DE102012006658A1
DE102012006658A1 DE102012006658A DE102012006658A DE102012006658A1 DE 102012006658 A1 DE102012006658 A1 DE 102012006658A1 DE 102012006658 A DE102012006658 A DE 102012006658A DE 102012006658 A DE102012006658 A DE 102012006658A DE 102012006658 A1 DE102012006658 A1 DE 102012006658A1
DE102012006658A
2012-04-03 Application filed by Buestgens Burkhard filed Critical Buestgens Burkhard
2012-04-03 Priority to DE102012006658A priority Critical patent/DE102012006658A1/en
2013-10-10 Publication of DE102012006658A1 publication Critical patent/DE102012006658A1/en
It is a micro-pilot valve 1 is proposed, which serves to generate a control pressure between two pressure levels 5 and 7 and is characterized by a microcavity 2, the at least one valve outlet 3, a first micro bore 4 to a first pressure level 5 and a second micro bore 6 to a second pressure level 7 comprises. A closure member 8 in the microcavity 2 is movable between the microbores, closing microbore 4 in a first end position and microbore 6 in a second end position. A microactuator 10 actuates via a transmission element 9, which protrudes through at least one of the microbores, the closure part 8. The micro pilot valve 1 enables switching frequencies in kHz range at switching pressures up to 30 bar and is preferably used to control pneumatically actuated dosing, Drop-on-demand or switching valves or arrays of these.
The invention is directed to a micro-pilot valve 1 with a very short switching time. Pilot valves are used to amplify a small switching power by means of a pneumatic pressure as an auxiliary power for controlling processes that require a higher switching capacity.
A generic micro-pilot valve with a very short switching time, for example, in a pneumatically actuated print head in DE 10 2009 029 946 A1 for use. The valve is used to generate a control pressure, which is to occupy two defined pressure levels. For this purpose, a series connection of a microvalve and a pneumatic throttle element is used between two predetermined pressure levels, at the common pneumatic node, a pressure value is set, which is used as a control pressure. While in the state of the closed valve exactly the pressure of a respective pressure level is set as the control pressure, the control pressure in the opened state of the valve is set to a value which lies between the two pressure levels. Tolerances and even small contamination of the throttle element cause undesirable scattering of the resulting control pressure. Also, with the valve open, a permanent air consumption can be found.
Desirable is a micro-pilot valve with switching times less than 0.1 ms to generate a control pressure, which must be able to accurately accept the values of two predetermined pressure levels and which has no permanent air consumption.
The object is achieved by the micro-pilot valve according to the invention 1 solved that to generate a control pressure between two pressure levels 5 and 7 serves and is characterized by a microcavity 2 that has at least one valve outlet 3 , a first microbore 4 to a first pressure level 5 and a second microbore 6 to a second pressure level 7 includes. A closure part 8th in the microcavity 2 is movable between the microbores, being microbored in a first end position 4 and in a second end position microbore 6 closes. A microactuator 10 actuated via a transmission element 9 penetrating at least through one of the microbores, the closure part 8th ,
The micro-pilot valve according to the invention 1 eliminates the aforementioned disadvantages of the prior art and can produce a control pressure that can accurately assume two applied pressure levels, with switching times less than 0.1 ms and switching frequencies above 5 kHz. The valve according to the invention has a dead volume of only a few microliters, which contributes significantly to short switching times.
In a first embodiment of the invention, the micro pilot valves according to the invention in a multi-channel pressure or dosing head after DE 10 2009 029 946 A1 , the content of which is hereby incorporated by reference as part of this application, used to control pneumatically controlled fluid ejectors, which apply in the free-jet process viscous coating materials, in particular thixotropic coating materials on surfaces. The fluid ejectors work in a drop-on-demand process, according to a valve or displacement principle.
In a second embodiment of the invention, the micro-pilot valves according to the invention in a multi-channel pressure or dosing head after DE 10 2009 029 946 A1 used to control pneumatically controlled fluid ejectors, wherein the fluid ejectors are designed as pneumatically controlled liquid or gas valves and are used for the rapid switching of liquid or gas streams in hydraulic or pneumatic applications.
Thus, micro-pilot valves 1 be used for controlling pneumatically controlled valves for hydraulic or pneumatic control of fluids or gases and for free-jet application of gaseous or flowable materials. Furthermore, an array of micro pilot valves 1 be used to control an array of pneumatically controlled valves for the hydraulic or pneumatic control of fluids or gases as well as for the free-jet application of gaseous or flowable materials. In summary, find micro-pilot valves according to the invention 1 thus preferably use for controlling pneumatically actuated dispensing, dosing, drop-on-demand or switching valves or arrays thereof.
1 shows a micro-pilot valve according to the invention 1 . 2 the enlargement of a detail with a variant. Centerpiece of the micro-pilot valve 1 is closure part 8th which is in microcavity 2 located, which valve outlet 3 , first microbore 4 that with the first pressure level 5 connected and second microbore 6 that with the second pressure level 7 is connected. micro holes 4 and 6 are arranged in particular coaxially. microcavity 2 can be in substrate 20 or housing of the microvalve may be integrated or may be a separately manufactured insert 13 which is in substrate 20 or into the case 20 of the micro-pilot valve 1 is admitted. microcavity 2 has, for example, a lid 17 on, in which is microbore 4 located. Around Short switching times will increase the volume of microcavity 2 designed as small as possible. microcavity 2 then has at most a volume of a few microliters. The diameters of the microbores 4 and 6 are depending on the application between 0.1 mm and 0.5 mm or 0.3 mm to 1 mm. closing part 8th gets into microcavity 2 guided so that it in a first end position the first microbore 4 and in a second end position, the second microbore 6 closes. The contact surface of the microbores are at the same time valve seat of the respective valve. Thus, in the micro-pilot valve 1 two opposing valves by a closure member located therebetween 8th actuated. Small leaks only have a small effect on the value of the control pressure at the valve outlet 3 off and are tolerable. The seal between the closure part 8th and micro drilling 4 or 6 can be based on a positive connection of the sealing surfaces involved, so the valve seats. closing part 8th can be of any geometry. It can be guided freely movable in the microcavity or by means of an elastic suspension with the housing of the micro-pilot valve, the insert 13 or the substrate 20 be connected. closing part 8th is for example a ball, see 1 , or a cylindrical part whose sealing surfaces are formed by the respective end faces, or a cylindrical part, see 2 , whose end faces have a diameter reduction relative to the cylinder, carried out, for example, as a step or chamfer. The diameters of the two end faces are then selected such that a defined sealing width of, for example, 0.03 mm to 0.2 mm around the microbores 4 and 6 around. In the first application example mentioned above, the diameter of the closure part is 8th , z. B. the ball, for example, between 0.3 and 1 mm.
closing part 8th is through a microactuator 10 emotional. The stroke is typically between 0.02 and 0.1 mm. microactuator 10 is preferably designed as a piezo actuator, in particular as a bending transducer or piezo stack actuator. Also suitable are miniaturized electromagnetic or electrodynamic actuators, which are designed for the mentioned strokes.
The transmission of the movement of the microactuator 10 on the closure part is carried by transmission element 9 , This is preferred with Mikroaktuator 10 or closure part 8th firmly connected. It can also be a molding of the microactuator 10 or the closure part 8th be. Is transmission element 9 with microactuator 10 firmly connected so can the connection 11 to the microactuator 10 after mounting the microcavity 2 and inserting the closure part 8th be produced by a joining process (gluing, soldering, welding). To make readjustments, a detachable connection can be selected. If only compressive forces are transmitted, can be dispensed with a fixed connection. 3a and 3b shows a variant in which the transmission element 9 by means of two guides 13 Horizontally centered so that this on the ball 8th centric force can exercise.
The transmission element 9 protrudes through microbore 4 and transmits the movement of the microactuator 10 on the closure part 8th through the microbore 4 therethrough. This type of force application allows the volume of the microcavity 2 can be small, because the microcavity 2 contains only the closure part. Because the transmission element 9 through the microbore 4 protrudes, it can be designed as a needle or rod with a diameter, depending on the size of the microbore 4 , for example 0.05 mm to 0.5 mm, and a length of 1-2 mm. An advantageous embodiment of the transmission element 9 is the execution as a flat Ätzteil, for example, plate material made of stainless steel or brass with a thickness of <0.1 mm.
In one variant is microactuator 10 a piezo bending transducer consisting of a substrate plate 12 the thickness 0.05 mm to 0.3 mm and one (monomorphic) or two (bimorph) thin Piezo plates 12a the thickness 0.1 mm to 0.3 mm. The transmission element 9 is with the microactuator 10 via connection 11 connected or integrated part of the microactuator, z. B. a 90 ° - bend an extension of the substrate plate 12 ,
In one variant, the first pressure level 5 lower than the second pressure level 7 and micro drilling 4 has a larger cross section than microbore 6 ,
In another variant, the first pressure level 5 lower than the second pressure level 7 , Micro drilling 4 has a larger cross section than microbore 6 , additionally has micro bore 6 a diameter between 100 microns and 300 microns and microbore 4 a diameter between 200 microns and 500 microns.
Description of the function assuming the use of a piezo bending transducer: pressure level 7 lie between 0.5 and 30 bar, pressure level 5 to ambient pressure. Also, pressure level can be 5 have a negative pressure. closing part 8th close pressure-assisted by pressure level 7 microbore 4 , so that the control pressure at the valve outlet 3 the value of pressure level 7 accepts. In this position, the actuator 10 be configured so that transmission element 9 with closure part 8th is in contact or connected, or so that a distance between transmission element 9 and closure part 8th exists, see 3a , For electrical control of the actuator 10 this leads to his movable end of an adjusting movement downwards, by means of transmission element 9 through the microbore 4 through on the closure part 8th is transmitted. actuator 10 is designed so that with auseichender force closure part 8th on microbore 6 can be pressed to this against pressure level 7 to close, see 3b , At the same time microcavity 2 over microbore 4 vented and the control pressure at outlet 3 takes the value of the pressure level 5 , so ambient pressure. The valve is configured as a Normally-Open microvalve in this configuration.
According to the invention, it is proposed to damp the movement of the microactuator. In a damping gap 14 between a surface of the microactuator 10 and a fixed surface of the housing 20 there is a viscous liquid, preferably a silicone oil, see 1 , The surfaces of the damping gap 14 are perpendicular to the direction of movement of the actuator 10 aligned, thus finds squeeze film damping in the damping gap 14 instead of. If surfaces are selected parallel to the direction of movement of the actuator, then a Couette flow forms in the damping gap 14 out. 4 shows an example: In a round or elongated recess 16 of the housing 20 protrudes a round or flat shape 15 of the microactuator 10 into it. formation 15 can also be designed as a separate part, which is glued, soldered or welded, for example, as a mandrel or plate and with the actuator. The damping gap 14 , please refer 1 would be, for example, between a surface of the microactuator 10 and a surface of the substrate 20 ,
DE 102009029946 A1 [0002, 0006, 0007]
Micro-pilot valve 1 for generating a control pressure, characterized by - a microcavity 2 that has at least one valve outlet 3 , a first microbore 4 to a first pressure level 5 and a second microbore 6 to a second pressure level 7 includes, - a closure part 8th in the microcavity 2 which is movable between the microbores, being microbored in a first end position 4 and in a second end position microbore 6 closes, - and a microactuator 10 that has a transmission element 9 penetrating at least through one of the microbores, the closure part 8th actuated.
Micro-pilot valve according to claim 1, characterized in that the microactuator 10 is designed as a piezoelectric actuator, in particular as a bending transducer
Micro-pilot valve according to claim 1, characterized in that the first pressure level 5 lower than the second pressure level 7 is and micro drilling 4 has a larger cross-section than microbore 6 ,
Micro-pilot valve according to claim 1, characterized in that the first pressure level 5 lower than the second pressure level 7 is, microbore 4 has a larger cross-section than microbore 6 , Micro drilling 6 has a diameter between 100 microns and 300 microns and microbore 4 has a diameter between 200 microns and 500 microns.
Micro-pilot valve according to claim 1, characterized in that the first pressure level 5 less than the second pressure level 7 is and the transmission element 9 through microbore 4 protrudes.
Micro-pilot valve according to claim 1, characterized in that the closure part 8th a ball is.
Micro-pilot valve according to claim 1, characterized in that the transmission element 9 with microactuator 10 and / or closure part 8th is firmly connected.
Micro-pilot valve according to claim 1, characterized in that the transmission element 9 and closure part 8th are one piece.
Micro-pilot valve according to claim 1, additionally characterized by means for damping the movement of the microactuator.
Use of micro pilot valves 1 according to any one of the preceding claims for controlling pneumatically controlled valves for the hydraulic or pneumatic control of fluids or gases and for the free-jet application of gaseous or flowable substances.
Use of micro pilot valves 1 according to claim 10, characterized by the use of an array of micro-pilot valves 1 For controlling an array of pneumatically controlled valves for the hydraulic or pneumatic control of fluids or gases as well as for metering, dispensing or free-jet application of gaseous or flowable substances.
DE102012006658A 2012-04-03 2012-04-03 Micro-pilot valve Withdrawn DE102012006658A1 (en)
DE102012006658A DE102012006658A1 (en) 2012-04-03 2012-04-03 Micro-pilot valve
PCT/DE2013/000166 WO2013149610A1 (en) 2012-04-03 2013-03-28 Micro pilot valve
DE112013001932.9T DE112013001932A5 (en) 2012-04-03 2013-03-28 Micro-pilot valve
US14/390,059 US9638350B2 (en) 2012-04-03 2013-03-28 Micro pilot valve
GB1417431.2A GB2514976A (en) 2012-04-03 2013-03-28 Micro pilot valve
DE102012006658A1 true DE102012006658A1 (en) 2013-10-10
ID=48606982
DE102012006658A Withdrawn DE102012006658A1 (en) 2012-04-03 2012-04-03 Micro-pilot valve
DE112013001932.9T Pending DE112013001932A5 (en) 2012-04-03 2013-03-28 Micro-pilot valve
US (1) US9638350B2 (en)
DE (2) DE102012006658A1 (en)
GB (1) GB2514976A (en)
WO (1) WO2013149610A1 (en)
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DE102009029946A1 (en) 2009-06-19 2010-12-30 Epainters GbR (vertretungsberechtigte Gesellschafter Burkhard Büstgens, 79194 Gundelfingen und Suheel Roland Georges, 79102 Freiburg) Print head or dosing head
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2012-04-03 DE DE102012006658A patent/DE102012006658A1/en not_active Withdrawn
2013-03-28 WO PCT/DE2013/000166 patent/WO2013149610A1/en active Application Filing
2013-03-28 GB GB1417431.2A patent/GB2514976A/en active Pending
2013-03-28 DE DE112013001932.9T patent/DE112013001932A5/en active Pending
2013-03-28 US US14/390,059 patent/US9638350B2/en active Active
DE112013001932A5 (en) 2015-01-08
US20150316172A1 (en) 2015-11-05
WO2013149610A1 (en) 2013-10-10
US9638350B2 (en) 2017-05-02
GB201417431D0 (en) 2014-11-19
GB2514976A (en) 2014-12-10
GB2514976A8 (en) 2014-12-17
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2012-04-03 R086 Non-binding declaration of licensing interest
2014-10-06 R118 Application deemed withdrawn due to claim for domestic priority
2015-02-19 R118 Application deemed withdrawn due to claim for domestic priority