DE19807647C5 - Device for dispensing a fluid and dispensing cannula for this purpose - Google Patents

Abstract

contraption for dispensing a fluid with a conveyor with a conveyor or Dosing cylinder, one in the conveying or dosing cylinder reciprocating conveying or metering piston for conveying the Fluids from a container to one of an output cannula formed Ausströmleitung via a Valve block (2), wherein the discharge line has an outlet opening, at the sponsored Fluid from the discharge line exit, and a return line (3), characterized in that the dispensing cannula has a main body (1) has, which is connected to the valve block (7) and the outflow line (2) and the return line (3) formed parallel to each other in the base body (1) and whose Walls through the body (1) are formed and at a downstream end of the discharge line (2) one on the main body (1) held terminal device provided and by a spout (12) is formed, the connecting device in a vicinity of an outflow opening Area of the dispensing cannula is arranged and the spout about a pivot axis in a lock-up position, in the...

Description

The The invention relates to a device for dispensing a fluid the preamble of claim 1.

Out DE 92 18 204 U1 a conventional device of the aforementioned type is known, which has a valve block with a three-way valve, via which optionally via a metering cylinder funded from a container amount of fluid is either fed into a dispensing cannula or without the dispensing cannula to run through can be returned directly into the container.

Regarding this conventional Device, it has proved to be disadvantageous that even after the implementation several rinses, in which the above promoted the dosing Fluid back into the container back passes, in a subsequent metered amount of fluid u. U. are strongly aged fluid fractions, because the dispensing area of the dispenser remains outside the rinse cycle. As far as in this device flushing and return possibilities provided in the form of an attachable to the outlet opening return hose are such a device by the user only cumbersome to handle.

Of the Invention is therefore based on the object, a device for To improve a fluid of the type mentioned in such a way that a complete flushing or Fluid recirculation in the associated reservoir guaranteed with uncomplicated handling.

Regarding a device of the type mentioned is this task solved by the invention the features of the characterizing part of claim 1.

Thereby will it be possible in the context of a possibly several pump strokes comprehensive rinsing process also in the dispensing cannula formed outflow line Completely and without complicated To flush operations.

For this is in the area of the outlet opening the dispensing cannula a connection device provided for connecting the Return line to the discharge line to return the the discharge line flowing through Fluids in the container.

The outflow and the return line are together in the preferably of a plastic material, or formed in a particularly high-quality embodiment made of stainless steel dispensing cannula. Such a configuration of the dispensing cannula proves to be particular from a manufacturing point of view with regard to a easy installation as particularly advantageous and also allows an effective stiffening of the dispensing cannula.

The outflow and the return line are preferably formed the same length and have in an advantageous In each case the same channel cross-section. Especially at an embodiment the dispensing cannula made of a plastic material, the two lines in an advantageous Each way a circular Cross-section and are in a sprayed embodiment longitudinal each tapered slightly conically educated. In this embodiment can be particularly high surface qualities in terms of the two Reach lines limiting line inner walls. In the Production of the dispensing cannula from an extrusion material or also machined, for example from a Teflon semi-finished product, is the ejection cannula with advantage of cylindrical or prismatic shape.

The outflow and the return line are vorteilliger way designed such that in an exit area the dispensing cannula the exit opening the discharge line an entrance opening the return line is arranged immediately adjacent. This will provide an immediate bridging of the possible for both lines. Advantageous are the outflow line and the return line designed such that their longitudinal axes parallel to each other. The dispensing cannula is in an advantageous manner Way designed so that this in one to the longitudinal axis the discharge line vertical Cutting plane a circular, elliptical or preferably "8" shaped Cross section has.

The connecting device is through a spout is formed in a, the outflow opening adjacent area the dispensing cannula is arranged, wherein the spout element in a bridging position can be brought, in which the outflow to the return line connected is. The spout is advantageously provided with a handle device for manual switching between a bridging position, a dispensing position and possibly also a closed position, in which the outlet opening the dispensing cannula is closed. The said grip device is in an advantageous Way in one piece with the example, from a plastic material formed Ausgußelement educated.

The spout is pivotally mounted to the dispensing cannula. The pivot axis in this case extends substantially in the longitudinal direction of the dispensing cannula. The spout is advantageously designed like a cap and on an outer peripheral surface of the dispensing cannula mounted pivotally.

The Dispensing tube is connected to a valve block, wherein in the valve block a fluid supply channel and a fluid return channel are formed, the corresponding with the discharge line and the return line are connected. This valve block is in an advantageous manner made of a plastic material by injection molding or machining. The formed in the valve block Fluidzu driving channel and also formed in the valve block fluid return channel can thereby on manufacturing technology particularly advantageous manner by cylindrical Core elements are formed in the formation of the valve block penetrate formed in a mold cavity and after curing of the Plastic material can be removed from this.

in the With regard to a simple construction of a forming tool for forming of the valve block, the dispensing cannula is preferably as a separate Part formed and only in the context of a mounting step in pressed the valve block. This makes it possible on the one hand in an advantageous manner, different output cannulas and possibly also different valve blocks as needed with each other combine. The use of a press-connection device allowed a particularly firmly adhering, high-density attachment of the dispensing cannula to the Valve block. Alternatively, the dispensing cannula may also be threaded attached to the valve block. For this purpose is preferably the Dispensing tube or a union nut with provided a threaded portion.

Of the Valve block can also be made of a block material, for example by be formed machining. With regard to a high Chemical resistance If the valve block is preferably made of a Teflon, polypropylene (PP), Polyethylene (PE) or polyamide material.

A particularly stable and highly dense in the area of the Dosierzylinderfußes Embodiment of Device is given by the fact that the delivery or metering cylinder in one piece with the valve block is formed. The delivery or metering cylinder and the valve block and possibly also the dispensing cannula can thereby in the context of a single plastic injection process inside a corresponding mold are formed, so that after opening the Form tool one at least from conveying or metering and Valve block existing unit can be removed from the mold. The mold is for this purpose advantageously at least two parts formed, with a running between the two mold parts interface preferably substantially parallel to a plane which a central axis of the conveying or Containing dosing.

A in the integral training of delivery and metering and Valve block advantageous embodiment the invention is given by the fact that the delivery or metering a made of a glass, ceramic or thermosetting plastic material formed cylinder insert, in one piece with taken the valve block formed jacket portion, in particular injected. This makes it possible in an advantageous manner, a extremely high sealing effect between the inner wall of the conveyor or Dosing and then a smoothly reciprocating movable conveying or dosing piston. Due to the preferably integral with formed the valve block shell section is the cylinder insert an effective reinforcement and given an effective splinter protection.

A with regard to a high material saving advantageous embodiment The invention is characterized in that the valve block as a skeleton construction is formed with spaced webs. These spaced apart Webs extend in an advantageous manner in essence to parallel a central axis of the funding or dosing cylinder. The individual webs can be used for further stiffening the valve block by further, truss-like arranged cross connecting webs be stiffened. To a particularly stable attachment of the dispensing cannula to a such, designed as a skeleton construction valve block reach, is advantageously a receiving recess for Picture of a foot section the dispensing cannula arranged such that these one of the axially extending webs passes radially. A Central axis of the preferably cylindrical receiving recess extends in an advantageous manner in a corresponding median plane of the axially extending stiffening web. The receiving recess is doing in an advantageous manner in a pot-like Wanduagsabschnitt added. This pot-like wall section can additionally through further, for example radial Querversteifungsstege still further be stiffened.

In order to enable a positionally accurate fastening of the dispensing cannula to the valve block, a positioning device is advantageously formed by corresponding sections of the valve block and the dispensing cannula, by means of which the fastening position of the dispensing cannula to the valve block is clearly established. This positioning device can either have a cannula-side engaging portion which can be brought into engagement with a valve block-side engagement counter portion, or one on the valve block in the region of the Aufnahmeausneh Mung trained engaging portion, which is engageable with a cannula side formed engagement counter portion.

Around a particularly high sealing effect and a particularly tight fit the dispensing cannula in to ensure the valve block are at a mounting portion the dispensing cannula preferably formed a plurality of sealing blades, which are under high surface pressure with a corresponding inner peripheral portion of a in the valve block formed receiving recess in contact.

The Invention will be described below with reference to a preferred embodiment described in conjunction with the drawing. Show it:

1 a formed in Integralbauweise output tube with parallel juxtaposed outflow and return lines;

2a an axial section through an inserted into a base region of a dispensing dispensing dispensing cannula, wherein the dispensing cannula is provided in the region of its outlet opening with a spout, which is here in a dispensing position;

2 B an axial sectional view through the same dispensing cannula as well as through the same spout element, wherein the spout is here but in a rinsing position;

3a a detailed axial sectional view and a simplified, associated side view of the spout in the dispensing position,

3b a detailed axial sectional view and a simplified, associated side view of the spout in rinsing position,

4 an axial sectional view through a metering dispenser with integrally formed conveying or metering and a Ausabekanüle integrally molded return line.

In the 1 illustrated dispensing cannula comprises a body 1 , which is preferably made of a plastic material. In the main body 1 are both a discharge line 2 as well as a return line 3 educated. The discharge line 2 and the return line 3 are through a partition wall section 4 that is integral with the main body 1 is formed, separated from each other. Both the discharge line 2 as well as the return line 3 have a circular cross-section and open in the embodiment shown here in a plane-shaped end face 5 ,

On one of the face 5 opposite side of the body 1 is the dispensing cannula with a mounting portion 6 provided over which the dispensing cannula at one here by the reference numeral 7 designated valve block is attachable. The attachment section 6 comprises in the embodiment shown here a substantially cylindrical Einpreßzapfenabschnitt 8th in close fitting, sealingly into a correspondingly formed fitting bore of the valve block 7 is pressed. Alternatively to the illustrated embodiment of the attachment portion 6 it is also possible, the dispensing cannula integral with the valve block 7 form or for example via a threaded device with the valve block 7 connect to. The threaded device is advantageously designed such that in the tightened state no cavity remains between the thread flanks. This can be achieved in particular by a slightly conical thread.

In the valve block only partially shown here 7 are a fluid supply channel 9 and a fluid return passage 10 educated.

The fluid supply channel 9 includes a suction valve, not shown here, and opens via a front side in the attachment portion 6 trained passage opening in the discharge line 2 , The in the body 1 trained return line 3 is about one, the mounting or Einpreßzapfenabschnitt 8th or threaded pin portion radially penetrating through hole with the fluid return passage 10 in connection. The fluid return channel 10 is formed here as a substantially rectilinear channel and extends slightly inclined from a lower portion of the valve block 7 to the attachment section 8th , Due to the high surface pressure between the attachment section 8th and the inner wall of the in the valve block 7 trained mounting hole is a high tightness of the transition region between the return line and in the valve block 7 formed fluid return channel 10 reached.

In the embodiment shown here, the discharge line 2 and the return line 3 formed in a side-by-side manner. It is also possible, the discharge line 2 and the return line 3 form coaxial with each other, so that one of the two lines is formed by a correspondingly sized annular space. The return line 3 extends continuously uninterrupted from the outlet opening of the discharge line 2 back to the valve block 7 ,

Line complete flushing of the discharge line 2 can be achieved in that a spout l2 is used as described below in connection with the 2a and 2 B is described.

The representations according to the 2a and 2 B are apart from each different switching positions of the spout 12 identical.

Deviating from the illustration according to 1 is the valve block provided for receiving the dispensing cannula 7 with a reference numeral 1 designated (only partially shown) conveying or metering cylinder shown here completely. The dispensing cannula shown here is on the valve block 7 fastened in the same way as previously in connection with 1 was explained.

At her, the valve block 7 opposite end is the dispensing cannula with a spout 12 pivotally movable on the body 1 attached, provided. In the position shown here, the spout is in a dispensing position and allows the outflow of a fluid sucked through the delivery or metering cylinder initially via a suction line not shown here via the fluid supply channel 9 and the discharge line 2 , To a particularly smooth movement of the spout 12 relative to the main body 1 to enable, and also a reliable sealing of the inlet opening of the return line 3 to allow, are between the spout 12 and the body 1 two sliding washers 13 . 14 provided over the spout 12 and an engagement structure, not shown here, between the spout element 12 and the body 1 in close contact with the in 1 with the reference number 5 designated end face are held.

The sliding disks 13 . 14 are preferably formed of a glass, plastic or ceramic material and provided with through holes, depending on the position of the spout 12 can be brought into cover.

The spout 12 is about a parallel to the central axis of the body 1 the output cannula extending pivot axis pivotally. In the spout 12 is a short turning hole 15 or deflecting channel is formed, via which the fluid emerging from the dispensing cannula is deflected.

At the in 2 B shown functional position of the spout 12 this bridges the outflow line 2 and the return line 3 and thereby allows the simplified flow indicated by arrows fluid flow from the delivery or metering cylinder 11 back into a container, not shown here or comparable collecting device. This makes it possible, for example, a larger amount of fluid through the conveyor or metering cylinder 11 and through the dispensing cannula 12 through which it is ensured that in the dispensing cannula 12 no meanwhile aged or, for example, by drying in terms of its concentration changed fluid is. The structure and operation of the spout described above 12 will be described below in connection with the 3a and 3b explained in more detail.

In the schematic representation acc. 3a is the spout 12 already in conjunction with 2a explained switching position. One in the spout 12 formed deflection bore 15 or the deflection channel has in the dispensing position in the vertical direction down. In this switching position of the spout 12 they get into the sliding disks 13 and 14 formed through holes in such a way that the supplied fluid from the Ausströmleitung 2 can drain away. Now is the spout 12 from the in 3a shown switching position in the in 3b pivoted switching position shown, the discharge line formed in the dispensing cannula 2 with the return line 3 connected, whereby a complete fluid exchange of the in the discharge line 2 initially fluid is possible.

The representation according to 4 shows an axial sectional view through a Dosierdispenser with an integral with the valve block 7 trained conveying or Dosierzylin the 11 , wherein the conveyor or metering cylinder 1 in one piece with the valve block 7 trained coat section 16 is included. In the conveying or metering cylinder 11 is a means of a handle device 17 in the vertical direction up and down movable delivery or metering piston 18 added. The delivery or metering piston is formed in the embodiment shown here as a precision ground piston and limits one in the conveyor or Dosierzlinder 11 variable in terms of volume conveying or metering 19 , By means of an adjustment 20 can the permissible stroke of the delivery or metering piston 18 and thus the maximum volume of the delivery or metering space 19 be set. The adjustment device 20 acts with a stop 21 together, in one piece with the shell section 16 is trained. The stop 21 surrounds an upper end region of the delivery or metering cylinder 11 and also forms a reinforcing member for reinforcing the upper opening of the delivery or metering cylinder 11 ,

In the valve block 7 is a container valve 22 provided, which in the embodiment shown here, a valve ball 23 covered on a precision valve seat 24 seated, which in the embodiment shown here by a precision-formed surface portion of the valve body 7 is formed. Below the container valve 22 extends into a hose pin 25 formed intake duct 26 , The opening stroke of the valve ball 23 is through a socket element 27 limited by the delivery or metering cylinder 11 through the valve block 7 pressed. is.

The socket element 27 forms a fluid passageway 28 that the intake duct 26 over the container valve 22 with the conveying or dosing space 19 combines. The socket element 27 is with a radial passage opening 29 provided that the fluid passageway 28 with one in the main body 1 the outlet cannula recorded valve 30 combines. That in the body 1 recorded valve 30 comprises one by means of a spring 31 in a closed position crowded valve ball 32 and one in the main body 1 the dispensing cannula pressed valve seat member 33 , which is formed in the embodiment shown here from a plastic, glass or ceramic material.

The named valve spring 31 sits in the outflow line formed in the dispensing cannula 2 that runs continuously from the valve 30 extends to its outlet opening.

The outlet opening of the discharge line 2 is immediately adjacent the inlet opening of the return line 3 arranged. The return line extending in the dispensing cannula 3 is substantially the same length as the outflow conduit in the dispensing cannula 2 , The dispensing cannula is in the valve block 7 over the Einpreßzapfenabschnitt 8th pressed. The Einpreßzapfenabschnitt 8th is provided with a radial through-hole which is connected to a formed in the valve block fluid path means via which any fluid conveyed via the return line can get back into the container.

The valve block 7 is here designed as a skeletal structure and by means of a union nut 34 attached to a container or, for example, to a supply base of an automatically operated metering device.

The Invention is not on the above-described embodiment limited. For example, it is also possible in particular in one embodiment the dispensing cannula with coaxially arranged channels the spout into the dispensing cannula insert.

It is possible, too, the dispensing cannula bent form so that the in the outlet area of Auströmieitung located outlet opening in use position of a corresponding device down has.

It is possible, too, in which, returning to the container Fluid way to provide a valve, in particular a ball valve, the a fluid outlet, for example, due to a pressure change in the container, prevented. This valve is advantageously in the range the entrance mouth the return line or also arranged in the valve block. The spout is advantageously designed so that this can be brought into a non-use position is in which the two formed in the discharge tube lines outward are shut off.

Claims (14)

Device for dispensing a fluid with a conveying device with a conveying or metering cylinder, a conveying or metering piston that can be moved back and forth in the conveying or metering cylinder for conveying the fluid from a container to an outflow line formed by an outlet cannula via a valve block ( 2 ), wherein the discharge line has an outlet opening, at which the conveyed fluid emerges from the discharge line, and a return line ( 3 ) is provided, characterized in that the dispensing cannula a basic body ( 1 ), which on the valve block ( 7 ) and the outflow line ( 2 ) and the return line ( 3 ) parallel to each other in the main body ( 1 ) and their walls through the body ( 1 ) are formed and at a downstream end of the discharge line ( 2 ) one on the main body ( 1 ) and provided by a spout ( 12 ), the connecting device is arranged in a region of the dispensing cannula adjacent to an outflow opening, and the spout element is arranged about a pivot axis into a bridging position, in which the outflow line ( 2 ) and the return line ( 3 ) are interconnected and pivotable in a dispensing position. Apparatus according to claim 1, characterized in that the outflow line ( 2 ) and the return line ( 3 ) are formed substantially the same length. Device according to one of claims 1 or 2, characterized in that the outlet opening of the outflow line ( 2 ) adjacent to an inlet opening of the return line ( 3 ) is arranged. Device according to one of claims 1-3, characterized that the Pivoting axis extends substantially in the longitudinal direction of the dispensing cannula. Device according to one of claims 1 to 4, characterized in that in the valve block ( 7 ) a fluid supply channel ( 9 ) and a fluid return channel ( 10 ) are formed, which correspond to the discharge line ( 2 ) and the return line ( 3 ) are connected. Device according to one of claims 1 to 5, characterized in that the dispensing cannula into the valve block ( 7 ) is pressed. Device according to one of claims 1 to 6, characterized in that the conveying or metering cylinder ( 11 ) in one piece with the valve block ( 7 ) is trained. Device according to one of claims 1 to 7, characterized in that the conveying or metering cylinder ( 11 ) is screwed into the valve block. Device according to one of claims 1 to 8, characterized in that the conveying or metering cylinder ( 11 ) comprises a cylinder insert formed from a glass, ceramic, thermoplastic or duroplastic plastic material, which is integral with the valve block (in 7 ) formed shell section ( 16 ), in particular injected. Device according to one of claims 1 to 9, characterized in that the valve block ( 7 ) is designed as a skeleton construction with spaced webs. Apparatus according to claim 10, characterized in that the valve block ( 7 ) is provided with a receiving recess for receiving a foot portion of the dispensing cannula, wherein the receiving recess on the valve block ( 7 ) is formed such that it passes through a radially extending in an axial plane web. Device according to one of claims 1 to 11, characterized that one Discharge tubule positioning is provided for determining the position of the dispensing cannula on the Valve block. Device according to claim 12, characterized in that that the Discharge tubule positioning a cannula side having trained engaging portion having a valve block side trained Eingriffsgegenabschnitt is engageable. Apparatus according to claim 12, characterized in that on the valve block ( 7 ) In the region of the receiving recess, an engagement portion is formed which can be brought into engagement with a dispensing counterpart on the side of the dispensing cannula.