DE8231971U1 - DEVICE FOR DOSING IN PARTICULAR LIQUIDS - Google Patents

Description

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Device for dosing liquids in particular

The invention relates to a device for dosing in particular Liquids that are conveyed through a flexible hose, the flow cross-section of which is at a hose section can be changed with the aid of two pressure elements opposite one another on both sides of the hose, in that at least one of the pressure elements can be adjusted electromagnetically from the outside against the hose conduit to allow adjustment of the respective flow cross-section to compress the hose.

Such devices are used, among other things, for the metered dispensing of beverages in vending machines or for metering liquid chemicals are used, whereby the devices then usually also form the drive part of a peristaltic pump will. In addition, devices of this type are also used, for example, in medical technology, in laboratories and in other areas Used when you want to determine liquids conveyed through hoses by narrowing the hose cross-section Wants to dose purposes.

For compressing or squeezing the liquid leading hose can be two on either side of the hose opposite electromagnetic magnets are used whose armatures are moved against the circumference of the hose when the magnets are excited and the hose directly or squeeze them together using separately attached pressure elements to avoid the initially free flow cross-section , depending: more or less as required, if necessary until it is completely shut off.

It is also known to use a fixed stop in its direction instead of the one electromagnet the armature of the electromagnet on the other side of the hose is adjusted, so that in this case the Hose is pinched and compressed between the anchor and the fixed stop surface.

It is disadvantageous in these devices that the magnets provided on the side of the hose section to be squeezed have a relatively large space requirement, especially since necessary guides for the hose must be arranged externally,

so that the devices build accordingly large and are often difficult to accommodate. It should also be borne in mind that the Devices that only work with a single electromagnet and a counter-stop do not always result in a faultless one and exact dosage will lead and that one at

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Frequent use of two electromagnets - try it! hatj. to precisely synchronize their function.

The object of the invention is to provide a simple and compact structure and even in use only a single magnet that works reliably. This object is achieved in the Öerät mentioned above according to the invention in such a way that the axial adjustment movement of the armature of the electromagnet via at least one lever in a substantially radial direction against the wall of the hose directed lever movement is implemented.

This gives you control over the design of the magnet and the lever or lever accordingly Apply high pressure forces to the circumference of the hose to be able to, whereby a safe function of the device is guaranteed in any case. Furthermore only a single electromagnet is used, regardless of the number of levers used, so that accordingly favorable arrangement of the armature a small and compact structural unit can be achieved v / ground. This is before especially possible if the armature is in the form of a disk or plate freely guided in the yoke on one end face of the magnet is arranged.

Otherwise, the one that is already in the yoke can then also

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axiaP.e passage as a guide channel for the through the Device running hose can be used, provided that the anchor is designed, for example, as an annular disc and provided that their central hole and the guide channel are on the same axis. It does not apply to this one Solution also the otherwise disruptive external guides and guide channels.

Each lever that is used is expediently designed with two arms and can be attached to a fixed, arranged on the bobbin axis are pivotably mounted, the armature engaging the shorter lever arm in each case and the respective longer lever arm rest with its end against the hose wall or brought into contact shall be. If two of these levers are used, they are located diametrically on either side of the hose opposite to.

The invention is described below with reference to an in the anlie ™ Lowing drawing illustrated embodiment explained in more detail. The drawing shows an inventive Device in longitudinal section *

The electromagnet of the essentially rotationally symmetrical constructed derates consists of a yoke 1 in which the Sink or winding wound onto a bobbin 2

is used. The armature 4 is designed as an annular disk, which is arranged on the top face of the magnet according to the drawing and on the circumference of the outer upper part la of the yoke is overlapped.

Two double-armed, diametrically opposed to each other are used as pressure elements opposite lever 5,6 used. These can be pivoted about fixed axes 7, 8, which are on the coil body are molded. For this purpose, the coil formers have corresponding approaches which carry the axes mentioned.

The armature engages on the respectively shorter lever arms 5a, 6a 4 with its lower ring surface, while the longer lever arms 5b, 6b when the device is in the rest position as actual pressure elements bear against the wall of the hose 9 running through the device from the outside or can be brought to the plant. To the laterally directed pivoting of the lever arms to 5.6 enable 1 slots 10, 11 are provided in the inner part of the yoke.

The hose 9 is by a longitudinally extending through the device Guide channel secured and guided against lateral movement. A sub-area of this guide channel is Formed below by the hole 12 in the yoke 1. Another Part of the guide channel is created through the inner wall of a

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extending parallel to the longitudinal axis 13 and reaching through the hole 4a of the armature 4 connector 14a Cover 14, which covers the armature 4 on the side facing away from the magnet. The guide channel formed in this way, c the coil 3, the yoke 1 and also the central hole 4a of the armature lie on the longitudinal axis 13.

Werni the coil 3 via the connections 15, 16 to the operating voltage is switched, the armature 4 is pulled down, whereby it presses on the cam-like ends of the lever arms 7a, 6a and the levers into the one shown in dashed lines Swiveled position in which the hose 9 is squeezed to the flow cross-section more or less to reduce.

The extent to which the hose 9 is deformed and the flow cross section is narrowed depends on the possible stroke χ des Anchor 4. This stroke can be determined, for example, with screws 17, which are inserted through holes in the armature 4 and the cover 14 are inserted so that when the nut 18 supported on the cover is rotated in the one or the other direction of the screw head 17a serving as a stroke limitation of the armature upwards or downwards is moved.

Various possible modifications lie within the scope of the invention the illustrated embodiment. So could

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For example, one of the two levers.5,6 is omitted and be replaced by a fixed stop, towards which then the end of the longer arm of the remaining one -individual lever is pivoted.

In addition, it seems appropriate to the anchor, in cross section seen through the profile to form frustoconical and to face the truncated conical surface of the armature with a corresponding KcgelstuEipface on the yoke 1, as indicated by dashed lines 4b, 4c and 1b. This will have the advantage that in the position shown, i.e. at the beginning of the armature adjustment, a relatively low magnetic shunt exists between the armature and the yoke, whereby the armature can be moved more easily from the rest position, because only a relatively small holding force has to be overcome.

In addition, the device according to the invention will not only be used for dosing liquids, since the Dosing of other flowing and flowing media, such as gases, can be carried out with the device.

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Claims (7)

Expectations I ( I. Device for dosing liquids in particular, which are conveyed through a flexible hose, whose Flow cross-section on a hose section with the aid of two opposite one another on either side of the hose Pressure elements can be changed by at least one of the pressure elements against electromagnetically from the outside the hose circumference is adjustable in order to adjust the respective flow cross-section to compress the hose, characterized in that the axial adjustment movement of the armature (4) of the electromagnet is over at least one lever (5, 6) in a lever movement directed essentially radially against the wall of the hose (9) is implemented. 2. Device according to claim 1, characterized in that the Armature (4) is arranged in the form of an annular disk on one of the end faces of the electromagnet and that the Hub ix) of the armature is adjustable. 3.Gerät according to claim 2, characterized in that the Perimeter of the armature (4) is overlapped by the yoke (1,1a) of the electromagnet that the armature in the profile section • · ■ ■ is rectangular or frustoconical and that the truncated conical surface (4b, 4c) of the armature is opposite a corresponding truncated conical surface (Ib) of the yoke (1).
5 4. Device according to one of claims 1 to 3, characterized through a longitudinal guide channel for the hose (9). 5. Device according to one of claims 1 to 4, characterized in that that the guide channel, the central hole (4a) in the annular armature (4), the coil (3) and the yoke (1) of the electromagnet lie on the same longitudinal axis (13). 6. Device according to one of claims 1 to 5, characterized in that that the armature (4) is covered with a cover (14) on its side facing away from the coil (3) is, which engages with a nozzle (14a) through the central anchor hole (4a) and part of the Forms guide channel. 7. Device according to one of claims 1 to 6, characterized in that that each lever (5,6) is designed with two arms and around a fixed one, preferably on the bobbin (2) arranged axis (7,8) versahwenkbar ii I ! I tt (i ltd -3- is stored that the anchor (4) on the shorter Lever arm (5a / 6a) engages and that each length ^ more lever arm (5b, 6bj with its end against the Hose maintenance of the introduced into the guide channel Hose (9) is applied.