EP1757807A1 - Micrometering system - Google Patents

Abstract

The micro-dosing system (1) doses incompressible fluid (3). It is a closed system, including at least one opening and closing device (11, 31, 41), at least one volume setting device (13, 43) and at least one ejection device (17), which ejects the fluid from the system through at least one nozzle (25), accelerating it in the process.

Description

The invention relates to a Mikrodosiersystem that can position non-compressible media or highly viscous media such as conformal coatings, flux, adhesives and paints in small quantities with high accuracy.

Microdosage systems place small quantities per dosage at a selected one. Place. In particular, in electronics manufacturing, must be used in the protective coatings, flux, adhesives and paints, and in micromechanics, such as. As in automobile switches, in which minimal amounts of oils and fats are used, is used with dosing quantities of the order of less than 5 mm ³ , in particular with amounts of 1 mm ³ and even less, per dosage With such small amounts of a microdosing It should be possible no deviations in quantity between the individual dosages.

The applicant is pressure-time-controlled systems are known, which bring the metered medium to a metering valve under a relatively high pressure, usually at pressures of more than 5 bar and then direct the pressurized medium without contact. These systems are referred to in the art as jet systems. A disadvantage of this type of microdosing is that it is not volumetric. The amount of medium is dependent on the pressure, the opening time of the valve and the viscosity of the medium, which is perceived in the art as very disadvantageous.

Microdosing systems are preferably used in automation technology. Due to the high dosing frequencies - in particular 60 and more doses per second - which are required by the production, the pressures of the medium must be increased in jet metering valves. However, they save themselves at high pressure into their constituents. As a result, especially microdosing of fats with these systems is a problem.

In addition, the applicant is aware of a needle system which brings the desired amount of the medium to be metered with the needle to the metering point. This is a volumetric method. However, the control of machines with Nadeldosiergeräten is problematic insofar as they need contact with the surface to be wetted. This requires a very precise adjustment of the path lengths and the distance from tool to component, which is complicated by tolerances in. Component and tool. Due to the necessary exact needle positioning, these machines must be programmatically so be interpreted that they can not approach the demanded by the production high dosage frequencies. Furthermore, a small amount of a high-viscosity medium with the needle in their withdrawal direction is taken back. The result is an undesirable nose or thread formation of the medium.

Thus, the two known methods used in the microdosing have disadvantages. The pressure-time-controlled jet process is not volumetric and requires the operation of high pressures, which in addition to the requirements for the design of the systems, the dosage of certain media, especially fats, impossible or at least severely limits. The well-known volumetric method, the dosage with needle valve, does not work without contact, which brings the problems described with it.

Consequently, in view of the numerous disadvantages of the known microdosing systems, it has been attempted to provide a microdosing system which can dose non-drip media and highly viscous media discontinuously, drip-free and as accurately as possible at the required metering frequency.

From the patent literature continuous conveyor systems are known, which are described under the keyword piston pump or piston pump. So z. B. from the Japanese Patent Application JP 58 204 985 A a continuous, pulsation-free system is known, which can drive by means of a motor-driven camshaft with 120 ° offset switching times a medium in a horizontal conveyor channel forward. At the discharge side of the horizontal tube, the medium continuously emerges.

Another small volume metering system for volumes in the range of 10 mm ³ is disclosed in US Pat US 3,487,782 described that drives a three-cam camshaft with a reversible engine to forward and back through the reversible engine can. From the document it can be seen that the synchronicity of the pistons is essential in order to exert no pressure on the liquid.

Another metering piston pump system for continuous, pulsation-free fluid delivery is from the Swiss publication CH 500 378 removable. To enable the continuous system, the pistons of two pump heads mounted in parallel are each driven by a ram. With the help of a cam, the two rams are raised alternately. The pistons are each by a spiral spring recycled. In the additional patent to the Swiss publication CH 500 378 , in the CH 516 084 Discloses further embodiments with respect to suitable supply and discharge channels for continuous pumping systems.

The note to be able to promote viscous products by a piston pump is the CH 569,883 removable.

Thus, there is a need for a microdosing system which is as accurate as possible and which is designed in such a way that it can also be used in automation technology plants with correspondingly long service lives and high cycle numbers, i. many doses per second, can be used without problems.

The object of the invention is at least partially achieved by a metering system according to claim 1. Advantageous embodiments are to be seen in the dependent claims.

The microdosing system is suitable for volumetrically exact metering of incompressible media. In order to be able to dose volumetrically as precisely as possible, it is a closed system which has the following means: a means for opening and closing the system, a means for determining the volume of the medium to be dispensed and a suitable ejector. The ejector ejects the medium from the system through at least one nozzle. The medium itself is accelerated during ejection. For the acceleration, the nozzle and / or the ejector act in total so that the initially stationary medium undergoes such an acceleration that it is precisely positioned and spun without contact to the point to be wetted. By this pulse-like dosage noses and drawn threads of the incompressible medium are largely avoided, but at least significantly reduced compared to the applicant known systems. Since a means for volume determination of the medium is provided, the dosage is carried out volumetrisch using the Mikrodosiersystems invention.

Furthermore, the milk metering system has at least one means for conveying the medium. In this case, the means for conveying the medium next to it can also perform another of the aforementioned functions. Due to the presence of a means for conveying the medium, it is possible to provide the medium to the ejector almost without pressure or in the low pressure region. The high pressures, which decompose certain viscous media usually, are not nearly reached. Minimum pressures, z. In the range of 0.2 bar, may be present due to the system, because usually a feed pump in a supply line for the means for. Opening and closing the system is provided.

The ejection process is initiated between the nozzle and the ejector. During the ejection process, the medium located between the ejector and the nozzle is almost completely, that is, insignificant residual quantities may remain only, displaced. The fact that the ejection process relies on a certain amount defined by the means for determining the volume provides for the highly accurate and volumetric dosing. Another advantage of the microdosing system is the fact that the dosage is also "overhead", d. H. with inverted orientation of the microdosing, so that the surface to which the medium is to be applied, is located above the system, can take place. Even then it is dosed exactly and without blobbing.

By a clever design of the ejector by z. As a cone shape or a frusto-conical shape, which is coordinated with the nozzle shape, the dosage is more accurate. This also makes a further contribution to nasal and drip free. The nozzle and ejector are coordinated so that the ejector can find its seat in a conical bore and completely fills the space of the bore at least in the nozzle area. The two forms are coordinated so that inclination deviations in the cones or conical shapes below the micron range, d. H. less than 1/1000 mm, lie.

Also contributes to a preferred design of the ejector, in which the tip of the conical or frusto-conical end of the ejector in its rest position protrudes from the discharge opening of the nozzle to the dosing accuracy.

With a Mikrodosiersystem designed in this way, in particular by the design of the ejector and the nozzle, the incompressible medium can be metered in a targeted manner, in particular at a certain distance from a receiving surface to which the medium is to be applied. Touching the surface, as with needle valves, no longer needs to be ensured. Due to the non-contact dosage even the finest mechanical components which would be destroyed under low pressure or low momentum can be supplied with the medium.

The means for opening and closing the system may be, for example, a slider. Just as well, a suitable check valve could be selected. However, a slider is usually mechanically designed with less effort. In the closed state, the slide separates the medium, which is located in a so-called storage space, from the medium, which is located in a supply line to the microdosing system. This contributes to discontinuity.

Instead of a plunger, the means for determining the volume and for conveying the medium may be a pump, in particular a gear pump. Due to the great knowledge about miniaturized gear pumps, such pumps can be easily used.

Another embodiment of a microdosing system according to the invention provides that it provides a piston as a means for opening and closing the system, the means for conveying and the volume determination is another piston and the ejector is designed as a third piston. Can be driven, the individual pistons of the piston pump by a mutually offset multiple control disc drive such. B. a camshaft drive, which has no, determined by the scales of the application of microdosing, deflections. Due to the rigid mechanical control disk arrangement a good synchronicity for the discontinuous process is offered.

The means for determining the volume may comprise a piston which is controllable transversely to a reservoir. The flow direction of the medium and the control direction of the piston are almost perpendicular to each other. Depending on the control potential of the piston, the volume is expanded or limited. As a result, the volume determination is performed. However, the piston itself preferably can not completely pass through the storage space of the medium. He does not reach the opposite side of the storeroom

Instead of the cam-controlled drive can be provided at individual or at all points, a piezoelectric element. Instead of a mechanical drive so an electric drive is possible. If the Mikrodosiersystem has little space, can be obtained by the use of piezo elements instead of a camshaft space. The piezo elements contribute to a more impulsive movement behavior.

A further embodiment is that sealing elastomers are provided at the entry points of the piston in a housing, which provide upon application of a force for a one-sided bias of the piston. It is advantageous if the elastomer is incompressible and flowable. Thus, the elastomer performs several tasks. It seals the storeroom on one side, on the other side it ensures a defined position of the. Pistons, if not driven forward, d. H. the sealing elastomer has spring action. The suitable sealing elastomer may also be used at other locations in the system. A suitable place is z. B. the storage space facing the end of a piston which separates the storage space as a means for completing and opening the system. Due to the numerous positions of the sealing elastomers closed systems are generated, so that the highly viscous medium can leak controlled metered only at a single point. Another location for the sealing elastomer is the conical or frusto-conical tip of the ejector. As means for determining the volume and for conveying the medium, it is also possible to provide a sealing elastomer which seals off the point of entry of the piston and in which the conveying and volume-determining activities are carried out by applying pressure to the elastomer.

Fig. 1:

ein schematisches, verfahrenstechnisches Prinzipbild darstellt,

Fig. 2:

eine geeignete Ausführungsform der Blöcke aus Fig. 1 darstellt,

Fig. 3:

eine weitere Ausführungsform als integriertes Modell des Prinzipbilds nach Fig. 1 darstellt.

Fig. 4:

einen Schnitt entlang der Schnittlinie A4-A4 der Fig. 3 darstellt,

Fig. 5:

eine Ablaufsteuerung der einzelnen Kolben einer Ausführungsform eines integrierten Modells nach dem Prinzipbild der Fig. 1 darstellt,

Fig. 6

die Funktion des Auswerfers der Fig. 5 in einem schematischen Modell deutlicher darstellt, und

Fig. 7

eine weitere Ausführungsform eines Mittels zur Volumenbestimmung und Förderung schematisch zeigt.

The understanding of the invention is facilitated with reference to the drawings, wherein

Fig. 1:

is a schematic, procedural schematic diagram,

Fig. 2:

Fig. 1 illustrates a suitable embodiment of the blocks of Fig. 1,

3:

a further embodiment as an integrated model of the schematic diagram of FIG. 1 represents.

4:

3 is a section along the section line A4-A4 of FIG. 3,

Fig. 5:

1 is a sequence control of the individual pistons of an embodiment of an integrated model according to the schematic diagram of FIG. 1,

Fig. 6

5 clearly illustrates the function of the ejector of FIG. 5 in a schematic model, and

Fig. 7

another embodiment of a means for determining volume and promotion shows schematically.

1 shows a microdosing system 1 as a schematic block diagram with conventional process-related characters. The individual blocks are a. Means for opening and Completing 11 of the system 1, a volume determination means 13 of a medium 3, which is preferably an incompressible medium, such as a paint, an adhesive or a flux used in electronics manufacturing, a means 15 for promoting the medium 3 and an ejector 17 for the medium 3. Furthermore, as media and means for micromechanical production can be used, such as oils or fats and lubricants. Especially the known difficult-to-dose high-viscosity substances, such as fats, can be well promoted and dosed with the microdosing 1. The single ones. Means 11, 13, 15 and the ejector 17 communicatively communicate with each other, represented by the connecting lines 61, wherein in some embodiments, the connecting line must not be given as a separate element; essential is the connection of one agent with the other. The means for opening and closing 11 of the microdosing 1 makes the system a closed system, which can always flow only a certain amount of the medium 3 in the microdosing 1 from the supply line 33. Optionally, individual means can also fulfill several functions at the same time, for example, the means for volume determination 13 and the means for. Conveying 15 as a unit executable when the means 13, 15 are for example a gear pump 7.

The ejector 17 dosed accurately, especially drip-free, noseless and thread-free medium 3 in the desired direction, z. B. on the surface 4, to which the medium is to be applied, as shown by the droplets in Fig. 1st By the terms "drip-free", "noseless" and "thread-free" it is meant that normally only the volume of medium defined by the dosing system leaves the system. Medium does not escape uncontrolled from the system. The medium 3 can be completely depressurized or with a minimum pressure of less than 5 bar, preferably less than 1 bar or even 0.5 bar, compared to conventional systems. As a rule, the pressure results from the conveyors which, not shown, introduce the medium from a storage container (not shown) to the microdosing system 1. However, the microdosing system 1 does not need its own overpressure, so that the dosage works. In some embodiments, the microdosing system 1 is even designed to work without any overpressure beyond the pressure inherent in the medium, referred to as autogenous pressure.

In Fig. 2, a suitable embodiment according to individual components. the listed for Fig. 1 means 11, 13, 15 and the ejector 17 is shown. In the chosen Embodiment of the microdosing 1, the ejector 17 has a piston referred to as ejector piston 45. In addition to the ejection piston 45, the means 11 and 13 and 15, a closure piston 41 and a process piston 43 are present in the respective housings 10. The closure piston 41, the process piston 43 and the ejector piston 45 together with the housings 10 form a microdosing system 1, wherein the individual means 11, 13, 15 and the ejector 17 through the connecting lines. 61 are connected so that the medium 3 without receiving ambient air from a means 11, 13, 15 to the next means 11, 13, 15 is continued. The closure piston 41 in the housing 10 of the opening and closing means 11 has the function of a slide 31, the supply line 33, which leads into the housing 10, in a closing manner and temporarily opens for a subsequent delivery of the medium 3 to the other means , The volume determination means 13 is equipped with a process piston 43. Whose end 47 is arranged changeable in a free area of a storage space 35. The path length of the piston stroke and the diameter of the piston 43 determine the volume to be metered. In this case, the means for determining the volume 13 may be constructed so that only by the reaching into the reservoir 35 of the means for determining volume 13 end 47 of the piston 43, a volume determination takes place. Furthermore, the process piston 43 with the housing 10 performs the function of a piston pump. In normal operation, when the microdosing system 1 is not intended to run dry, the storage space 35 is permanently completely filled with the medium 3 to be dispensed, as well as the lines 61. The ejection piston 45, which is an important part of the ejector 17, ends with a part 19 of the ejector 17, which is provided with a tip 23 at the front end 21 of the ejector piston 17. The tip 23 is at least piecewise precisely tailored for a seat 27 of a designed as a nozzle 25 opening 29, laser cut or eroded. Due to the exact fit of seat 27 and front end 21, the highly accurate and thread-free dosage is favored. The means 11, 13, 15 and the ejector 17 are designed to be variable in their opening directions, so that the medium 3 undergoes a deflection in its flow movement. According to the embodiment, the deflection of the flow direction is in each case 90 °.

FIGS. 3 and 4 show an embodiment of a microdosing system 100 according to the invention as a piston pump 108. Fig. 4 illustrates the piston pump 108 along the section A4-A4 in Fig. 3. The housing 110, which consists of individual components, but in total for the piston pump 108 is designed to be mounted in one piece, consists of individual blocks, with functional openings, holes. Recesses and milling are provided. The housing 110 consists in layers of a line housing 95, a reservoir housing 93, a piston block 91 and a bearing housing 97th

The line housing 95 is with. Lines and openings equipped, so for example with the supply line 133 for the medium to be metered, which widens in a connection opening 134 opens. On the side facing away from the connection opening 134, the supply line 133 is delimited by an insert 128, through the center of which an opening 126 is provided as the seat for the closure piston 141. The port 134 is intended to be a connecting line, for. Example, a hose, as for example in Figs. 2 and 1, liquid-tight record. The supply line 133 has a diameter adapted to the amount of medium to be metered, which is smaller than the diameter of the connection opening 134. The line housing 95 shows a further opening 129, which runs in particular, at least partially, conically. The opening 129 may be made by drilling, including laser drilling, or honing. The opening 129 provides a seat 127 for an end 119 of the ejector 117, which is provided at its end 119 with a tip 123. In the line housing 95, a Auswutfsreservoir 130 is formed in the region of the end 119 of the ejector 117, in which the medium is conveyed and from which it is ejected. The storage space housing 93 is equipped with a recess which acts as a storage space 135. It has a first page 137 and a second page 139. Furthermore, the Vorratsraumgchäusc 93 is pierced. The pierced points are the inlet openings 159 for the pistons 141, 143 and 145, wherein the pistons either penetrate or even project into the storage space 135.

The piston block 91 also includes recesses in areas of the pistons 141, 143, 145. The pistons 141, 143, 145 are guided in guide sleeves 175 longitudinal rams, the transformer 177, in the embodiment of FIGS. 3 and 4 ball bearings 179 and rocker arm 181st of Control disk drives 151, all of which are supported on a camshaft drive 153 ', are moved. The pistons 141, 143, 145 pierce sealing elastomers 157 and their stops 189 approximately centrally. The sealing elastomers 157 cover the entry points 159 of the pistons. The sealing elastomers 157 prevent medium from the storage space 135 from escaping via the entry points 159.

The corresponding pistons 141, 143, 1.45, together with their corresponding counterparts, such as the nozzle (not shown in Figures 3 and 4, see reference 2, 25) and the orifice 129 and entry point 159, respectively corresponding length of the piston 143 and, by the tapered shape of the piston 141 with the corresponding insert 128 for receiving the tapered tip of the piston, an ejector 117, a means for. Feeding 115, a means for volume determination 113 and a means for opening and closing 111 of the micro-dosing 100. The pistons 141, 143, 145 are moved via the transformer 177.

These transformers sit in recesses of the piston block 91, which is created on the side facing away from the reservoir side. For each piston 141, 143, 145, there is a transformer 177, which can identify individually designed small deviations from the other transformers 177. The transformers are each driven by the control disk drives 151, which are seated on a camshaft drive 153, whereby several cams may also be present per complete revolution. The camshaft drive 153 is ball-bearing in at least two distally spaced, located at the end of the camshaft drive ball bearings 163. The camshaft drive 153 is driven by a drive shaft 165 which is driven by a bevel gear 167 operatively connected first bevel gear 169 and second bevel gear 171 power and speed driven. The bevel gear is secured on the shaft with the clamping ring 173.

In FIG. 5, the sequence of movements (A → F) of the individual pistons 241, 243, 245 of the microdosing system according to the invention, embodied as a piston pump 208, is shown in more detail in a schematic form. First, the medium 3 is present in the supply line 233. As shown in Fig. 5A, the ejection piston 245 closes by a concern in his seat 227, the opening 229. The closure piston 241 is withdrawn from the opening of the supply line so far that the medium 3 can flow into the reservoir 235, wherein the process piston 243 in a position within the storage space 235 is located; a position that is called closed. In a state shown as the next step in FIG. 5B, the process piston 243 is opened (arrow). In the illustrated embodiment, it is partially released from the storage space 235 by moving it back. The medium 3 can continue to flow into the reservoir 235. The retraction of the process piston 243 takes place in the direction of the first side 237 of the storage space 235, away from the second side 239 of the storage space 235. By this back movement, a certain negative pressure in the reservoir 235 is generated, which is filled up by the medium 3. Depending on the stroke and diameter of the piston 243, the delivered volume is determined. Thereafter, Fig. 5C, the process piston 243 initially remains in its retracted position, while the closure piston 241, which operates as a means for opening and closing the Mikrodostsrsystems, the supply line 233 blocked (arrow). Thus, a closed, sealed system has been formed with a precisely metered amount. Next, as shown in Fig. 5D, the ejector piston 245 (arrow) opens by being lifted off its seat 227 and retracted, drawing in some outside air. In the next step, FIG. 5E, the process piston 243 moves into the storage space 235 and to the second side 239 of the storage space 235 (arrow). It is lowered while the ejector or the ejector piston 245 remains open. As a result, the medium 3 passes into the ejection reservoir 230 and before the ejection piston 245. In a final step, as shown in Fig. 5F, the ejector piston 245 lowers (arrow). By the movement of the ejection piston 245, the medium 3 is ejected and the nozzle 225, through which the medium has been ejected in the ejection process, is closed. Thereafter, a new dosing begins, with the first step, as shown in Fig. 5A. Such a movement can be run several tens of times per second. For this purpose, the control of the piston 241, 243, 245 interpreted very precisely. Suitable are controls with cam fly drives and also piezo element drives.

According to the invention, the nozzle 225 and / or ejector, here the ejector piston 245, are designed such that the medium 3 experiences an acceleration during ejection. The special feature in the ejector piston 245 and its tip 223 is shown in more detail in FIG. Fig. 6A show the ejection piston 245 in the open state and Fig. 6B in the closed state. In the upper circles I and II, the end 219 is shown enlarged, as shown in the accompanying diagram below. In the retracted position of the ejection piston 245, the medium 3 at the tip 223 of the ejection piston 245 can flow past into the ejection reservoir 230 and thus in front of the opening 229.

As can be seen in particular in Fig. 6B, the tip 223 has in its rest position, when it lies on the seat 227, a positive and fully sealing contact with the opening 229 forming part of the housing 210. Here are the shape and surfaces of the front End 221 of the ejector and the nozzle 225 matched precisely to each other. The sealing length in the seat 227 between the tip 223 of the ejector piston 245 and the nozzle 225 is sufficiently long to allow no media to escape. Due to the precise design and the special shape not only a good seal is achieved, but the medium undergoes an acceleration in the ejection process, in addition to the acceleration it undergoes by the downward movement of the ejection piston 245. In particular, when dosing highly viscous lubricants, the medium in the preferred embodiment undergoes such a high acceleration that it is ejected from the microdosing system with high precision and concentrated in one drop.

In an alternative embodiment, it is provided that the tip 223 of the ejection piston 245 is made of an elastomeric material. As a result, a particularly good fitting and fitting of the tip 223 to the seat 227 are achieved.

A further preferred embodiment provides that the ejector, here the ejector piston 245, is designed so that the tip 223 projects beyond the opening 229 of the nozzle 225 when the ejector rests in its closed position, also referred to as the rest position, in the seat 227 , The protrusion of the tip 223 of the ejector piston 245 across the surface 240 of the microdosing system, which faces the surface to which the media is to be applied, further contributes to cleaner dosing.

FIG. 7 schematically shows a means for volume determination and a means for conveying, which have been realized in a process piston 343. According to this embodiment, an elastomer 309 is provided, which completely covers the opening 359 of the storage space 335. The elastomer 309 is incompressible and flowable, so that the plunger 349 of the piston is separated from the storage space. The elastomer 309 is displaced by the action of force (arrow 320) from the side opposite the end 347 of the process piston 343, from the top in the illustration of FIG. 7B. This displacement is shown schematically in FIG. 7B. By the displacement of the elastomer 309, the opening 359 and thus the volume of the storage space 335 is reduced. The medium is thereby conveyed in the direction of the ejector (not shown). This conveying movement is indicated by the arrow 350 in the illustration of FIG. 7, which in FIG. 7B has moved somewhat in the direction of the ejector in the illustration to the left in comparison with FIG. 7A. By loading and unloading of the elastomer 309 a pump-suction effect is generated, which is a promotion of the medium causes. At the same time a volume determination on the one hand on the dimensioning of elastomer 309 and opening 359 and the other on the degree of displacement of the elastomer 309 is possible.

In a modified embodiment, which is not shown, the process piston can also be realized entirely from the elastomer material. Even then, by means of appropriate force, a promotion function and by the appropriate dimensioning and the strength of the force volume determination.

Different drive mechanisms for a microdosing system according to the invention have been presented. In suitable cases, a combination of the different drive systems can be selected. Thus, each individual piston, also separate from the other pistons of the system, by means of piezo drive or by a pneumatic cylinder or by a camshaft drive can be operated. In practice, in particular the cam drive has proven to be particularly fast and reliable. It is also conceivable to use a piston by an equivalent means such. As a gear pump to replace. In particular, it would be possible here to exchange the middle, the process piston, with a gear pump.

The microdosing system is characterized by a highly accurate dosage of micro quantities at very high numbers of cycles without droplet formation, and experiments have shown that far more than three billion switching cycles, as shown in FIG. 5, can be passed through without the microdosing system shows a deteriorated dosage, let alone dysfunctional.

LIST OF REFERENCE NUMBERS

micro-dosing system

1, 100

medium

3

surface

4

gear pump

7

casing

10, 110, 210

Means for opening and closing

11, 111

Means for determining volume

13, 113

Means for conveying

15, 115

ejector

17,117

End of the ejector

19, 119, 219

front end of the ejector

21, 221

top

23, 123, 223

jet

25, 225

Seat

27, 127, 227

Opening, in particular conical opening

29, 129, 229

pusher

31

supply

33, 113, 233

pantry

35, 135, 235, 335

closure piston

41, 141, 241

process pistons

43, 143, 243, 343

ejection piston

45, 145, 245

End of the process piston

47, 347

connecting line

61

piston block

91

Pantry housing

93

line housing

95

bearing housing

97

piston pump

108, 208

opening

126

commitment

128

spitting reservoir

130, 230

port opening

134

first side of the pantry

137, 237

second side of the pantry

139, 239

Control disk drive

151

camshaft drive

153

sealing elastomer

157

entry point

159

ball-bearing

163

drive shaft

165

bevel gear

167

first bevel gear

169

second bevel gear

171

clamping ring

173

guide sleeve

175

exchangers

177

ball-bearing

179

rocker arm

181

attack

189

area

240

elastomer

309

arrow

320

tappet

349

arrow

350

opening

359

Claims (17)

Microdosing system (1, 100) volumetrically dosing incompressible media (3), the system being a closed system, comprising: at least one means for opening and closing (11, 31, 41, 111, 141, 241) of the system, at least one means for determining the volume (7, 13, 43, 113, 143, 243, 309, 343) of the medium to be dispensed, - At least one ejector (17, 117), which ejects the medium from the system through at least one nozzle (25, 225) through, wherein the nozzle and / or ejector are designed so that the medium undergoes an acceleration during ejection. Microdosing system according to claim 1, additionally comprising at least one means (15, 7, 115, 309) for conveying the medium (3). Microdosing system according to claim 1 or 2, wherein the nozzle (25, 225) and ejector (17, 117) are designed so that during the ejection process located between ejector and nozzle medium (3) is at least approximately completely displaced. Microdosing system according to Claim 3, in which the end (19, 119, 219) of the ejector facing the nozzle (25, 225) has a conical shape or truncated cone shape and the nozzle has the shape of a conical opening, in particular a bore (29, 29) tuned to the shape of the ejector. 129, 229), so that at least the front end (21, 221) of the conical or frusto-conical end of the ejector can find its seat in the conical orifice of the nozzle so as to completely fill it. Microdosing system according to Claim 4, in which the tip (23, 123, 223) of the conical or frusto-conical end (21, 221) of the ejector (17, 117) has the opening (29, 129, 229), in particular discharge opening, of the nozzle (17). 25, 225) projects beyond the ejection process. Microdosing system according to one of the preceding claims, the non-contact, in particular at a certain distance from a surface (4), to which the medium (3) is to be applied, and in particular targeted, almost nose and drip-free, metered the incompressible medium (3) , Microdosing system according to one of the preceding claims, in which the means for opening and closing (11, 111) the system (1, 100) is a slide (31) which holds the medium (3) in a feed line (33, 133, 233). to the microdosing of a storage space (35, 135, 235, 335) cutting off in the closed state separates. Microdosing system according to one of the preceding claims, wherein the volume determination means (13, 113) and the means for. Feeding (15, 115) of the medium is a pump, in particular a gear pump (7). Microdosing system according to one of claims 1-7, wherein the means for opening and closing (11, 111) of the system (1, 100) comprises a piston (41, 141, 241), the means for conveying (13, 113) and the for volume determination (15, 115) a further piston (43, 143, 243, 343) and the ejector (17, 117) is a third piston (45, 145, 245) of a piston pump (108, 208). Microdosing system according to claim 9, wherein the piston pump (108, 208) by a mutually offset multiple control disc drive (151), in particular a camshaft drive (153) is driven. Microdosing according to claim 9, wherein at least one of the pistons (41, 43, 45, 141, 143, 145, 241, 243, 245, 343) is driven by at least one piezoelectric element. Microdosing system according to one of Claims 9-11, in which sealing elastomers (157) are inserted at the entry points (159) of the pistons (41, 43, 45, 141, 143, 145, 241, 243, 245) into a housing (10, 110, 210) are provided, which provide upon application of a force for a one-sided bias of the piston, wherein the elastomer is incompressible and flowable. Microdosing system according to one of claims 1-7 and 9-12, wherein the means for determining the volume (13, 113) comprises a piston (43, 143, 243, 343) which is transverse to a storage space (35, 135, 235, 335 ) is controllable, the volume of which is expandable or limitable depending on the control position of the piston, whereby the determination of the volume takes place, wherein the piston preferably in no position comes into contact with the opposite side of the piston (139, 239) of the storage space. The microdosing system of claim 13, wherein at least the end (347) of the piston (343) facing the reservoir (335) is made of a sealing elastomer (309), the elastomer (309) being incompressible and flowable such that the ram (349) of the piston is separated from the storage space. A microdosing system according to any one of the preceding claims, wherein the conical-shaped end (19, 119, 219) of the ejector (17, 117) is formed of a sealing elastomer which is incompressible and flowable. Microdosing system according to one of the preceding claims, which is operable as a pressureless or low pressure system. Microdosing system according to one of claims 1-8 or 12-15, wherein the metering is carried out in the jet process.

Images