Dosing unit for dosing a fluid, dosing station and dosing tip for a dosing unit
阅读说明:本技术 用于流体配量的配量单元、配量站和用于配量单元的配量尖端 (Dosing unit for dosing a fluid, dosing station and dosing tip for a dosing unit ) 是由 保罗·施纳布勒 法比安·米特 杰奎琳·岑特 亚历山德拉·鲍尔 拉尔夫·沙伊贝 于 2020-04-15 设计创作,主要内容包括:提出一种用于流体配量的配量单元(12),所述配量单元具有:带有流体入口(16)和流体出口(18)的流体引导模块(14);用于控制或调节穿过所述流体引导模块(14)的流体流量的电磁阀(20);以及配量尖端(22),其中所述流体引导模块(14)的流体出口(18)引导至所述配量尖端(22)的流体入口(24),并且其中,所述配量尖端(22)包括弹性的、自动关闭的出口喷嘴(44)。此外,提出一种配量站(10)和一种配量尖端(22)。(A dosing unit (12) for dosing a fluid is proposed, having: a fluid directing module (14) with a fluid inlet (16) and a fluid outlet (18); a solenoid valve (20) for controlling or regulating the flow of fluid through the fluid directing module (14); and a dosing tip (22), wherein a fluid outlet (18) of the fluid directing module (14) leads to a fluid inlet (24) of the dosing tip (22), and wherein the dosing tip (22) comprises a resilient, self-closing outlet nozzle (44). Furthermore, a dosing station (10) and a dosing tip (22) are proposed.)
1. A dosing unit (12) for dosing a fluid, the dosing unit having: a fluid directing module (14) with a fluid inlet (16) and a fluid outlet (18);
a solenoid valve (20) for controlling or regulating the flow of fluid through the fluid directing module (14); and
a dosing tip (22), wherein a fluid outlet (18) of the fluid directing module (14) leads to a fluid inlet (24) of the dosing tip (22), and wherein the dosing tip (22) comprises a resilient, self-closing outlet nozzle (44).
2. Dosing unit (12) according to claim 1, characterized in that the dosing tip (22) has a dosing tip upper part (40) and a dosing tip lower part (42), wherein the outlet nozzle (44) is held between the dosing tip upper part (40) and the dosing tip lower part (42) in a form-fitting manner, wherein a fluid inlet (24) is formed in the dosing tip upper part (40) and a fluid outlet (26) of the dosing tip (22) is formed in the dosing tip lower part (44).
3. Dosing unit (12) according to claim 1 or 2, characterized in that the outlet nozzle (44) has at least two closing surfaces (48) which, in the closed state of the outlet nozzle (44), lie flat against one another, wherein a flexible membrane (50) is respectively molded on the closing surfaces (48) which defines at least one section of a circumferential side surface (53) of the outlet nozzle (44).
4. Dosing unit (12) according to any of the preceding claims, wherein the upper dosing tip part (40) and the lower dosing tip part (42) are mutually screw-coupled.
5. Dosing unit (12) according to one of the preceding claims, characterized in that the dosing tip upper part (40) has on its end side directed towards the outlet nozzle (44) a conically tapering section (47) towards the outlet nozzle (44), and the outlet nozzle (44) has on its inner side (49) in sections a correspondingly conically tapering section, such that the conically tapering section of the inner side (49) is located centrally on the conically tapering section (47) of the dosing tip upper part (42) in the mounted state of the dosing tip (22).
6. Dosing unit (12) according to any one of the preceding claims, characterized in that the outlet nozzle (44) has a surrounding flange (46) which is held between a dosing tip upper part (40) and a dosing tip lower part (42).
7. Dosing unit (12) according to any one of the preceding claims, characterized in that the dosing tip (22) comprises at least two mutually attracting magnetic elements (45, 56) which load the outlet nozzle (44) into a closed position.
8. Dosing unit (12) according to any one of the preceding claims, characterized in that a receptacle (58) for the magnetic element (56) is provided in the outlet nozzle (44).
9. Dosing unit (12) according to claims 7 and 8, characterized in that a magnet fixing module (60) is provided for fixing the magnetic element (56) on the dosing tip (22).
10. Dosing unit (12) according to any one of the preceding claims, characterized in that the outlet nozzle (44) is one-piece.
11. Dosing unit (12) according to any one of the preceding claims, characterized in that the dosing unit (12), in particular the solenoid valve (20), is connected to a control unit (39) for controlling the fluid output.
12. Dosing unit (12) according to any one of the preceding claims, characterized in that the outlet nozzle (44) is constructed such that it opens only when a fluid pressure of between 1bar and 2bar is applied.
13. A dosing station (10) for fluid dosing by means of at least two dosing units (12) according to any one of the preceding claims.
14. Dosing tip (22) for a dosing unit (12) according to any one of the preceding claims, characterized in that the dosing tip (22) comprises at least two mutually attracting magnetic elements (45, 56) which load the outlet nozzle (44) into a closed position.
15. The dosing tip (22) according to claim 14, characterized in that a receptacle (58) for the magnetic element (56) is provided in the outlet nozzle and/or that a magnet fixing module (60) is provided for fixing the magnetic element (56) on the dosing tip (22).
16. The dosing tip (22) according to claim 14 or 15, characterized in that the magnetic element (56, 45) is a permanent magnet granule (45), wherein the permanent magnet granule (45) is spread over the outlet nozzle (44) at least in the area of the closing face (48).
Technical Field
The invention relates to a dosing unit for dosing a fluid, a dosing station for dosing a fluid having at least two dosing units, and a dosing tip for a dosing unit.
Background
The metering unit is used for metering fluids, in particular for metering very small quantities of fluids between 0.2ml and 4 ml. The metering is carried out, for example, in a time-controlled manner.
The metering units can be used individually or combined with further metering units to form a metering station.
In known dosing solutions, drops of fluid still drip out of the dosing unit after the actual dosing, which negatively affects dosing accuracy or causes delays. Furthermore, relatively high pressures, in particular pressures of 10bar or more, are required for the metering.
A resiliently visible tip for filling with a fluid is known from EP 3100900950 a1, which tip is formed in a star shape in front view. In the region of the side wall from the star-shaped opening, outwardly directed projections are integrally molded, which should make this part of the side wall more stable in design, in order to give the wall a plate-like shape.
A dosing unit for dosing a fluid by means of a plurality of valves is known from US 2011/017933 a 1.
Finally, US 5524792 a describes a filling nozzle with an integrated PTC element for heating the inner surface of the nozzle body.
Disclosure of Invention
The aim of the invention is to enable a particularly precise and simple metering of small amounts of fluid.
According to the invention, the object is achieved by a dosing unit for dosing a fluid, having: a fluid direction module with a fluid inlet and a fluid outlet; a solenoid valve for controlling or regulating the flow of fluid through the fluid directing module; and a dosing tip, wherein a fluid outlet of the fluid directing module is directed to a fluid inlet of the dosing tip, and wherein the dosing tip comprises a resilient, self-closing outlet nozzle.
The dosing tip has a dosing tip upper part and a dosing tip lower part, wherein a fluid inlet is formed in the dosing tip upper part and a fluid outlet of the dosing tip is formed in the dosing tip lower part, and wherein the outlet nozzle is held in a form-fitting manner between the dosing tip lower part and the dosing tip upper part. The outlet nozzle is thus held stably and can be mounted in a defined position. The upper dosing tip part and the lower dosing tip part are for example screwed on.
In particular, the dosing tip is screwed directly into the fluid guide module, so that the fluid guide module can be constructed very simply and does not require a continuation (Fortsatz) on which the elastic outlet nozzle is fitted.
Preferably, the plurality of dosing tips is screwed into the fluid direction block such that a plurality of outlets is provided.
This type of fixing allows a good, precise positioning and perfect centering of the outlet nozzle. Furthermore, the outlet nozzle can be quickly replaced. By means of the upper and lower dosing-tip parts, it is furthermore also possible to arrange different outlet nozzles on the fluid-guiding module by changing the upper and lower dosing-tip parts used.
The elastic, self-closing outlet nozzle makes it possible to achieve a particularly precise metering of the fluid, in particular at relatively low fluid pressures of 1 to 2 bar.
In this way, a relatively large amount of fluid can be dosed with respect to a relatively short available time.
During the dosing process, the outlet nozzle can be opened by fluid pressure due to its elasticity and then automatically closed again by an elastic restoring force. The outlet nozzle is here only open at a defined pressure. This means that: the outlet nozzle allows the existing fluid volume present at the outlet nozzle to suddenly pass through and then close again and retain the remaining amount of fluid, in particular when the solenoid valve is closed. The metering is carried out discontinuously, i.e. without leakage. The pressure, from which the outlet nozzle opens, is preferably between 1bar and 2 bar.
The fluid output takes place in particular via the fluid outlet of the dosing tip.
According to one embodiment, the outlet nozzle has at least two closing surfaces which, in the closed state of the outlet nozzle, lie flat against one another, wherein a flexible diaphragm is respectively molded on the closing surfaces, which flexible diaphragm defines at least one section of a circumferential side surface of the outlet nozzle. With such an outlet nozzle, precise metering is possible even at relatively large nominal widths, in particular nominal widths of 2mm to 4 mm.
The length of the closing surface is preferably greater than the thickness of the membrane in the longitudinal direction of the dosing tip. The outlet nozzle is therefore sufficiently flexible to enable rapid opening and closing of the outlet nozzle, and the closing surface is sufficiently large to enable reliable, tight closing of the outlet nozzle.
The outlet nozzle has, for example, at least six closing surfaces, which in each case lie in pairs in a planar manner against one another in the closed state of the outlet nozzle, wherein a hinge is present between each two intersecting closing surfaces that merge into one another. The hinge helps to: the outlet nozzle is already capable of opening quickly at low fluid pressures, thereby improving the response time of the dosing unit.
In order to center the outlet nozzle, a variant of the invention provides that the upper dosing tip part has, on its end face pointing towards the outlet nozzle, a section tapering conically towards the outlet nozzle. The outlet nozzle has on its inner side, in sections, a section of corresponding conical design, so that the inner, conically tapering section, in the installed state of the dosing tip, rests on and is centered on the conically tapering section of the upper part of the dosing tip. Of course, the outlet nozzle can also be designed entirely conically on its inside. The tapered section then forms the entire inner side.
According to one embodiment, the closing surface of the dosing tip in the closed state in plan view is complementary to the shape of a slit or to the shape of a cross or star. The closing force of the outlet nozzle can be set by means of the number and arrangement of the closing surfaces. In this way, the outlet nozzle can be optimized for different dosing processes. For example, in the case of a cross-or star-shape, a higher fluid pressure is required to open the outlet nozzle than in the case of a slit shape.
Furthermore, the outlet nozzle can have a circumferential flange which is held between the upper dosing-tip part and the lower dosing-tip part.
The dosing tip can comprise at least two mutually attracting magnetic elements which load the outlet nozzle into the closed position. The magnetic element is for example a permanent magnet. The closing force of the outlet nozzle is additionally improved by the magnetic element. In particular, the magnetic element supplements the elastic restoring force of the outlet nozzle. Thus, the opening and closing properties of the dosing tip, in particular of the outlet nozzle, are optimized by the magnetic element.
Preferably, a receptacle for the magnetic element is provided in the outlet nozzle, for example in the form of a receiving bag. The magnetic element can therefore be fixed particularly simply to the outlet nozzle without additional fixing elements. In particular, the magnetic element can be held in the receptacle in a form-fitting manner.
Preferably, the free end of said outlet nozzle does not protrude with respect to the end of the lower dosing tip part, thereby protecting it.
The receptacle can be dimensioned smaller than the magnetic element, for example, so that the receptacle is slightly stretched when receiving the magnetic element. The magnetic element can therefore be held particularly reliably on the outlet nozzle.
Alternatively or additionally, a magnet fixing module can be provided for fixing the magnetic element on the dosing tip. The magnet fixing module mechanically fixes the magnetic element to the dosing tip. For example, the magnet holding module is a disk that is fitted over the dosing tip.
It is also conceivable for the magnetic element to be embedded in the outlet nozzle, in particular wherein the magnetic element is at least partially, in particular completely, encapsulated by the material of the outlet nozzle.
According to one embodiment, the magnetic elements can be permanent magnet particles, wherein the permanent magnet particles are distributed over the outlet nozzle (durchszen) at least in the region of the closed surface. In this way, the restoring force of the outlet nozzle can likewise be assisted and the opening and closing properties of the outlet nozzle can be improved.
In the case of injection molding of the magnetic element or in the case of the use of permanent magnet particles distributed over the outlet nozzle, the formation of the receptacle and/or the use of a magnet fixing module can be dispensed with.
The outlet nozzle is preferably one-piece. Thereby, the outlet nozzle is easy to manufacture, for example by means of injection molding. Furthermore, the dosing unit, in particular the dosing tip, is easy to mount.
For example, the outlet nozzle comprises silicone, fluoro-rubber, perfluoro-rubber and/or thermoplastic elastomer, or is composed of one of these materials. The material is sufficiently stable in terms of material thickness to be able to ensure a tight closure of the outlet nozzle and sufficiently flexible to enable a simple opening.
The nominal width of the dosing tip is for example 4 mm. The nominal width is determined by the inlet diameter of the outlet nozzle.
For example, the dosing unit has a fluid inlet module, wherein a fluid outlet of the fluid inlet module is connected to a fluid inlet of a fluid conducting module. The fluid to be metered can thus be fed to the fluid guide module via the fluid inlet module.
In order to be able to achieve a time-controlled metering of the fluid, the metering unit, in particular the solenoid valve, is connected to a control unit for controlling the fluid output. The dosing process lasts, for example, 25 ms.
The object is also achieved by a dosing station for dosing a fluid by means of at least two dosing units according to the invention. In such a dosing station, the fluid can be dosed simultaneously into a plurality of containers. Alternatively, different fluids can be dosed into the container in sequence.
The dosing station can comprise an identification device, by means of which the presence of a container below the dosing unit, in particular below the dosing tip, can be identified. The identification means comprise, for example, a light barrier which is interrupted by the container when the container is arranged in a preset position for dosing below the dosing tip.
According to the invention, the object is also achieved by a dosing tip for a dosing unit, wherein the dosing tip comprises at least two mutually attracting magnetic elements which load an outlet nozzle into a closed position.
A particularly precise dosing can be achieved with a dosing tip of this type.
The dosing tip according to the invention can be used as a replacement part in conventional dosing units. Thus, existing dosing units can be improved by using a dosing tip according to the invention.
The dosing tip can have the features and advantages already described above.
According to one embodiment, a receptacle for the magnetic element can be provided in the outlet nozzle.
Alternatively or additionally, a magnet fixing module can be provided for fixing the magnetic element on the dosing tip.
According to a further embodiment, the permanent magnet particles can be distributed over the outlet nozzle, at least in the region of the closing surface.
For the fluid metering, a pressure of between 1 and 2bar, in particular 1.6bar, is applied at the fluid inlet of the fluid directing module.
In combination with the metering unit or station according to the invention, such a fluid pressure makes it possible to achieve a particularly precise metering, wherein leakage flows are reliably avoided.
The time between the two dosing processes lies, for example, between 80ms and 100 ms.
The dosing time itself lies, for example, between 10ms and 30ms, in particular 25 ms.
During the dosing process, for example, between 0.2ml and 4ml of fluid are dosed, respectively.
Drawings
Other advantages and features of the present invention will appear from the following description and from the drawings referred to. Shown in the drawings are:
fig. 1a to 1e show different views of a dosing station according to the invention;
fig. 2a to 2d show different views of a dosing unit according to the invention;
fig. 3 shows an exploded view of a dosing tip according to the invention of a dosing unit according to the invention;
fig. 4a and 4b show the outlet nozzle of the dosing tip according to fig. 3;
fig. 5 shows the outlet nozzle of fig. 4a and 4b in an open state;
fig. 6 shows a top view of the dosing tip according to fig. 3;
fig. 7 shows a cross-sectional view through the dosing tip along line a-a in fig. 6;
FIG. 8 shows a detail view of region B in FIG. 7;
fig. 9a and 9b show an alternative outlet nozzle for the dosing tip according to fig. 3;
fig. 10a to 10e show another dosing tip according to the present invention;
fig. 11 shows the outlet nozzle of the dosing tip in fig. 10a to 10 d;
fig. 12a to 12d show another dosing tip according to the present invention; and
fig. 13 shows the outlet nozzle of the dosing tip in fig. 12a to 12 d.
Detailed Description
Fig. 1a to 1e each show a
The
Each
As shown in fig. 2a to 2d, each
In the
The
The
Preferably, the
In order to simplify the fluid supply to the
The main fluid channel 32 extends from the
For controlling the fluid output, the
Fig. 3 shows an exploded view of the
The
The upper and lower dosing-
The
The fluid pressure, from which the
The
As can be seen in the figure, the free, here lower end of said
Fig. 4a and 4b show a perspective view and a side view of the
The
In the embodiment shown in fig. 4a and 4b, the
In this case, a
A
The length l of the closing
The
When fluid pressure is applied to
For example, the
Alternatively,
Fig. 6 to 8 show further views of the
Fig. 7 and 8 show here in detail the form-fitting arrangement of the
In the mounted state of the
Furthermore, the upper
Alternatively, other geometries for orienting the
The
Inlet diameter d, which can also be referred to as nominal diameter, of
Also illustrated in fig. 7 is the screw connection between the dosing tip
Fig. 9a and 9b show an
According to another embodiment, not shown, the
A
In contrast to the
The
The
The
In the embodiment according to fig. 10a to 10e, the
In order to hold the
In the embodiment illustrated in fig. 11, the
In order to hold the
According to another embodiment, the
Fig. 12a to 12d diagrammatically show a
The
The
A further difference to the
Fig. 13 shows the
Alternatively, a cubic, rectangular or annular
According to the method according to the invention for metering a fluid by means of the
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