EP3868704A1 - Hose for a removal system and method for removing liquid from a container by means of a removal system - Google Patents

Abstract

The invention relates to a hose for a withdrawal system (1) with an interface 5a for detachable connection to a withdrawal head (2) of the withdrawal system (1) so that the hose (5) can be used as a disposable part for withdrawing liquid from a container.

Description

The invention relates to a hose for a withdrawal system and a method for withdrawing liquid from a container by means of a withdrawal system.

Such dispensing systems include bottles in which liquids such as chemicals are stored, where they have dispensing heads that can be attached to the openings of the bottles, the dispensing heads having suitable closure means for this purpose. Such bottles are used, for example, in laboratories.

In known extraction systems of this type, the extraction head is designed in the form of a simple cover and into which a hose is inserted and guided into the interior of the associated bottle. The hose is then connected to a pump to pump liquid out of the container.

As soon as the bottle is emptied, the tube is pulled out of the lid and, if necessary, used to remove liquid from another bottle.

Alternatively, the hose can also remain guided through the cover during the change. The lid is then attached to a new bottle.

A first disadvantage of such a removal system is that the hole in the cover through which the hose is passed does not seal Completion forms. Therefore, vapors from the liquid stored in the bottle can escape there, which is particularly critical when toxic chemicals are stored in the bottle.

Another disadvantage is that the tube pulled out of the empty bottle contaminates the liquid in the next bottle into which it is inserted, since liquid residues from the liquid in the first bottle are still adhering to it.

Furthermore, when the hose is pulled out, an operator can be exposed to liquid residues, caused by liquid residues dripping from the hose.

From the EP 2 848 583 B1 a removal system is known in which a removal head with a dip tube can be fastened in a container opening of a container. Liquid can be withdrawn from the container via the immersion tube.

Such extraction systems working with dip tubes can only be used for larger containers such as barrels, but not for the extraction of liquids from bottles.

When using the extraction system for bottles, structural changes would have to be made, which would affect the transport authorization, which is necessary for the extraction of liquids from the bottles.

The invention is based on the object of designing an extraction system of the type mentioned at the outset in such a way that it has a high level of functionality with a simple structural design.

The features of independent claims are provided to solve this problem. Advantageous embodiments and expedient developments of the invention are described in the dependent claims.

The invention relates to a hose for a withdrawal system with an interface for a detachable connection to a withdrawal head of the withdrawal system, so that the hose can be used as a disposable part for withdrawing liquid from a container.

The basic idea of the invention is thus to design the hose for removing liquid from a container, or also for filling the container, as a disposable part, that is to say as a disposable part.

For this purpose, the hose has a suitable interface, by means of which the hose can be detachably connected to the extraction head of an extraction system.

To remove liquid, the hose is connected to the removal head and the removal head is fixed to the container with a closure means as part of the removal head. After the liquid has been withdrawn, the hose is detached from the withdrawal head and can be disposed of with the bottle. In principle, the removal system according to the invention is also suitable for filling containers.

The hose according to the invention with the extraction system can be used for different containers. The containers can particularly advantageously be formed by bottles or canisters, to which reference is made below without restricting the generality.

The hose with the interface forms a cost-effective, economically producible unit that can be used as a modular unit in a removal system.

The interface is particularly advantageously designed for connection to different extraction heads.

The hose and its interface thus form a modular unit, which can be used flexibly and in a wide range of applications thanks to the possibility of connecting to different extraction systems.

The interface is also advantageously formed by a plastic part fastened to the hose.

The interface can thus be produced inexpensively and efficiently in the form of a plastic injection-molded part.

The invention also relates to a method for withdrawing liquid from a container by means of a withdrawal system.

An essential advantage of the invention is therefore that with the hose as a disposable part detachably attached to the removal head, contamination can be avoided in a simple manner when the removal head is used multiple times. The hose attached to the removal head is only used once to empty a bottle and then left in this bottle by actuating the actuation mechanism on the removal head. This prevents the liquid in the next bottle to be emptied from being contaminated with this hose, since a new hose is attached to the sampling head for this. This provides a contamination-free method for emptying bottles. The exchangeable hoses are extremely inexpensive, and they consist in particular of plastic parts. In general, the hoses can too consist of other materials, such as VA. The use of separate hoses for emptying the bottles therefore does not lead to any significant increase in the production costs of the extraction system.

According to an advantageous embodiment of the invention, the removal head has locking means which fix the tube in the removal head in a locking position. By means of the actuating mechanism, the locking means can be transferred into a release position in which they release the hose.

The locking means represent mechanical units which can be transferred from the locking position to the release position or vice versa by actuating the actuating mechanism.

The actuation mechanism is particularly advantageously a purely mechanical unit with which actuation movements are generated that can be implemented directly on the locking means.

This creates a structurally simple locking and unlocking mechanism for the hose.

According to a structurally advantageous embodiment of the invention, the locking means are formed by balls which are slidably mounted in bores of a guide channel. The hose can be guided in the guide channel. In the locking position, the balls are pressed against the hose with a pressing force, whereby the hose is fixed in position. In the release position, the balls are released from the hose.

These locking means are designed to be simple in construction and ensure safe locking and unlocking of the hose.

Particularly advantageously, bores arranged equidistantly in the circumferential direction and extending in the radial direction are provided in the guide channel, a ball being guided in each bore. The bores and balls are each designed identically and oriented in a plane running perpendicular to the longitudinal axis of the guide channel.

Since the balls for locking the hose in the bores are moved in the radial direction and thus directly towards the hose, there is good power transmission from the balls to the hose and thus a secure locking.

The identical design of the bores, the balls and their rotationally symmetrical arrangement in the guide channel and thus relative to the hose results in the same power transmission to the hose on all sides, which results in a particularly efficient, secure locking.

It is also advantageous that each bore is narrowed at its opening into the guide channel to a diameter which is smaller than the diameter of the balls guided in the guide channel.

This prevents the balls from falling out of the bores in a simple manner when the hose has been detached from the guide channel and the guide channel is thus empty.

According to an advantageous embodiment of the invention, the guide channel can be moved relative to the closure means.

In general, the guide channel can be part of a head part that is movable with respect to the closure means.

In this embodiment, in a blocking position of the closure means, actuating means press on the closure means relative to the guide channel the locking means in the bores against the hose and fix it in the guide channel. In a release position of the closure means, the adjusting means are out of engagement with the locking means relative to the guide channel, so that the hose is released from the guide channel.

The adjusting means are preferably arranged on the closure means. For example, projections, locking shoulders or locking lugs can be provided as adjusting means, which in particular can be part of the closure means and can be formed in one piece with it. Such adjusting means have a particularly simple structure. Furthermore, a particularly simple and direct coupling of the actuating mechanism to the locking means is realized with these.

In general, the actuating means are controlled by the actuating mechanism. This is done in a particularly simple manner in such a way that when the actuating mechanism is not actuated by a user, the adjusting means ensure that the hose is fixed in the blocking position of the closure means. By actuating the actuating mechanism, the actuating means are disengaged from the locking means.

The actuating mechanism is advantageously a spring mechanism. In this case, the head part is held in the blocking position relative to the closure means by the spring force of a spring. The transfer into the release position takes place by pressing the head part onto the locking means against the spring force of the spring.

The functional principle is thus such that the spring force of the spring ensures that the hose is fixed on the extraction head. To release the hose, a user must actuate the actuation mechanism by pressing the head part against the closure means. A new hose can also be fixed to the extraction head in this way.

According to a further variant of the invention, the closure means has two parts which can be moved relative to one another into a blocking position in which the hose is fixed on the removal head and which can be moved relative to one another into a release position in which the hose is released from the removal head .

A major advantage of this variant is that no separate actuation of actuating means is required to release the hose to the removal head. Rather, when the closure means is opened, in order to detach the removal head from the container, the hose is released from the removal head at the same time, so that it can fall into the emptied container.

On the one hand, this represents a rational design of the removal system, since there is no need to construct separate confirmation means. This also improves the functionality and operational safety of the extraction system. An operator no longer has to think about actuating an actuating mechanism and detaching the hose from the removal head. Rather, this takes place automatically and automatically when the closure means is opened.

According to a structurally advantageous embodiment, the closure means has two parts which can be moved relative to one another into a blocking position in which the hose is fixed on the removal head, and which can be moved relative to one another into a release position in which the hose is released from the removal head .

When the closure means is opened to detach the removal head from the container, the parts of the closure means are automatically transferred into the release position.

A releasable fixation of the hose on the removal head is thus realized in a structurally simple manner, the hose being automatically detached from the removal head, in particular when the closure means is opened.

According to a structurally particularly simple and robust embodiment, the first part of the closure means has engagement segments protruding over one of its end faces, each with first guide surfaces. The second part of the closure means has recesses with second guide surfaces opening out on one of its end faces. When transferring between the release position and the blocking position, the first part is moved against the second part by moving the first guide surfaces on the second guide surfaces.

The front sides of the parts lie close to one another in the locked position. In the release position, the parts are lifted from one another.

The guide surfaces of the engagement segments and the recesses ensure low-friction, controlled movability of the parts of the closure means with respect to one another.

The closure means in the screw closure is particularly advantageous.

In this case, when the screw cap is unscrewed, the parts of the closure means are transferred into the release position.

The screw cap is particularly easy to handle.

Figur 1:

Schematische Darstellung eines Entnahmesystems.

Figur 1a:

Einzeldarstellung des erfindungsgemäßen Schlauchs für das Entnahmesystem gemäß Figur 1.

Figur 2:

Erstes Beispiel eines Entnahmekopfs des Entnahmesystems gemäß Figur 1 mit darin verriegeltem Schlauch.

Figur 3:

Entnahmekopf des Entnahmesystems gemäß Figur 2 mit darin angeordnetem, entriegeltem Schlauch.

Figur 4:

Entnahmekopf des Entnahmesystems gemäß Figur 2 mit aus dem Entnahmekopf herausfallendem Schlauch.

Figur 5:

Zweites Beispiel eines Entnahmekopfs des Entnahmesystems gemäß Figur 1.

Figur 6:

Einzeldarstellung der Komponenten des Verschlussmittels des Entnahmekopfs gemäß Figur 5.

The invention is explained below with reference to the drawings. Show it:

Figure 1:

Schematic representation of a withdrawal system.

Figure 1a:

Individual representation of the hose according to the invention for the extraction system according to FIG Figure 1 .

Figure 2:

First example of a removal head of the removal system according to Figure 1 with the hose locked in it.

Figure 3:

Withdrawal head of the withdrawal system according to Figure 2 with the unlocked hose arranged in it.

Figure 4:

Withdrawal head of the withdrawal system according to Figure 2 with hose falling out of the sampling head.

Figure 5:

Second example of a removal head of the removal system according to FIG Figure 1 .

Figure 6:

Individual representation of the components of the closure means of the removal head according to Figure 5 .

Figure 1 schematically shows an exemplary embodiment of a removal system 1.

The removal system 1 comprises a removal head 2 which can be placed on an opening of a bottle 3 which contains a liquid 4. A hose 5 is mounted on the removal head 2 and is guided from the removal head 2 into the interior of the bottle 3.

The extraction head 2 is also connected to a pump 7 via a line 6. Liquid 4 is pumped out of bottle 3 by means of pump 7. The liquid 4 is discharged from the bottle 3 via the hose 5 and then fed to the line 6.

Figure 1a shows the hose 5 according to FIG Figure 1 . At a longitudinal end of the hose 5, an interface 5a for connection 11 to the removal head 2 is actuated. The interface 5a is designed as a plastic part and has a bore 20 extending in the longitudinal direction with which the interface 5a is plugged onto the hose 5. The plastic part forming the interface 5a has suitable formations 5b on its outer jacket surface, as a result of which an adaptation to the geometry of the removal head 2 is achieved. The interface 5a is designed for connection 11 to different extraction heads, that is to say extraction systems 1.

the Figures 2-4 show a first exemplary embodiment of the removal head 2 according to the invention. The removal head 2 has a closure means 8 in the form of a screw cap with which the removal head 2 can be fixed on the opening of a bottle 3. The screw cap has an internal thread 9 which can be screwed onto a thread 9 a on the opening of the bottle 3. With the screw cap of the removal head 2, the opening of the bottle 3 is tightly closed.

The removal head 2 also has a head part 10. At the upper end of the head part 10, a connection 11 is provided, to which the line 6 leading to the pump 7 can be connected. The connection 11 is secured with a check valve 12. The check valve 12 prevents liquid 4 from escaping from the line 6. Furthermore, a ball valve 13 is provided in the head part 10, by means of which an air and pressure equalization in the bottle 3 is effected.

A guide channel 14 opens out on the underside of the head part 10 and projects into a central recess 27 in the closure means 8, the lower end of the guide channel 14 being secured in the closure means 8 with fastening means 15. The guide channel 14 is designed as a hollow cylinder.

The head part 10 is movable with respect to the screw cap forming the closing means 8, whereby an actuating mechanism is formed.

A spring 16 is arranged between the head part 10 and the screw cap. The head part 10 is held at a distance from the top of the closure means 8 by the spring force of the spring 16 ( Figure 2 ). Confirms a user the actuating mechanism formed in this way, for this purpose it presses on the upper end of the head part 10 and presses it downwards until the underside of the head part 10 rests on the upper side of the closure means 8 ( Figure 3 and 4th ).

Figure 2 shows the removal head 2 when the actuating mechanism is not actuated. The hose 5 is mounted in the interior of the guide channel 14 and secured in position there with locking means.

As from the Figures 2-4 As can be seen, the upper end of the hose 5, which can be inserted into the guide channel 14, is provided with a sleeve 17 which forms the interface 5a and which has a recess 5b in the form of a groove 18 running around the circumference.

The locking means are formed by balls 19 which are guided in bores 20 in the guide channel 14. In the present case, three identical bores 20 are provided in a plane perpendicular to the longitudinal axis of the guide channel 14, each of which is offset from one another by 120 ° in the circumferential direction. The bores 20 run in the radial direction in the guide channel 14. A ball 19 is guided in each bore 20, with all balls 19 being of identical design. The balls 19 are guided in the respective bores 20 with little play.

The diameter of the bores 20 are slightly tapered in the area of the confluence with the guide channel 14, that is to say slightly smaller than the ball diameter, so that the balls 19 are prevented from falling out into the empty guide channel 14.

As from the Figures 2-4 As can be seen, on the uppermost edge of the wall element of the closure means 8 delimiting the recess 27, a projection 21 is provided which runs around in the circumferential direction and represents a narrowing of the recess 27 into which the guide channel 14 protrudes. This projection 21 forms an adjusting means, wherein Figure 2 the closure means 8 and shows the actuating means in a locked position. This blocking position is assumed when the actuation mechanism is not actuated and the spring 16 keeps the head part 10 at a distance from the closure means 8. The projection 21 forming the adjusting means then lies, as Figure 2 shows, in the area of the bores 20. The projection thus presses the balls in the bores in the direction of the interior of the guide channel 14, so that the balls 19 are pressed in a locking position with a pressing force against the groove 18 in the cuff 17 of the hose 5, whereby the Hose 5 is fixed in the guide channel 14.

If the actuation mechanism, as in Figure 3 actuated, the head part 10 is pressed against the screw cap forming the closure means 8 and the guide channel 14 is pushed further into the recess 27 of the screw cap. The closure means 8 and with it the projection 21 are thus transferred from the blocking position into a release position. In this release position, the projection 21 lies above the bores 20. The balls 19 are thus in the release position and are therefore no longer pressed against the hose 5 by means of the projection 21, that is, the hose 5 is no longer held in the guide channel 14. Due to the force of gravity, the hose 5 falls out of the guide channel 14 ( Figure 4 ) and falls into the bottle 3.

To empty the bottle 3, the removal head 2 is attached to the bottle 3. The actuation mechanism is not actuated and the hose 5 is firmly held in the guide channel 14 ( Figure 2 ). The bottle 3 is then emptied by means of the pump 7. As soon as the bottle 3 is empty, the actuation mechanism is activated and the hose 5 in the guide channel 14 is released ( Figure 3 ) so that the tube 5 falls into the empty bottle 3 and can be disposed of.

If the removal head 2 is to be used to remove liquid 4 from another bottle 3, a new tube 5 is first inserted in the

Guide channel 14 of the removal head 2 attached. For this purpose, a user actuates the actuation mechanism and then pushes the hose 5 into the guide channel 14. The user then lets go of the head part 10 so that the head part 10 is lifted off the closure means 8 by the spring force of the spring 16. The closure means 8 with its projection 21 is thus transferred into the blocking position, as a result of which the hose 5 is retained in the guide channel 14.

The structural unit formed in this way can then be placed on the further bottle 3 for removal of liquid 4.

Figure 5 shows a second embodiment of the withdrawal head 2 of the withdrawal system 1. In this case too, the tube 5 with the cuff 17 for withdrawing liquid 4 is used as a disposable part, that is to say as a disposable part, for withdrawing liquid 4.

In this case, the hose 5 is coupled to the screw cap forming the closure means 8, so that the hose 5 can be releasably fastened to the removal head 2 with it. In particular, the hose 5 is automatically released from the removal head 2 when the screw cap is unscrewed.

As Figure 5 and in particular the individual illustration of the closure means 8 in Figure 6 shows, this has two parts 22, 23 which are movable relative to one another.

Both parts have essentially rotationally symmetrical base bodies.

The first part 22 is formed essentially as a hollow cylinder. A plurality of identically designed engagement elements 24 protrude from the edge at one end face, each of which has a first guide face 25 that forms a curve.

The second part 23 has projections 26 opening out on its outer jacket surface, which are used for manual actuation of the screw cap. Inside the base body of the first part 22, recesses 27 opening out at an end face are provided, each recess 27 having a second guide surface 28 corresponding to the respective first guide surface 25 of an engagement element 24, that is, a second guide surface 28 configured in a complementary manner.

The first and second parts 22, 23 are rotated towards one another to form the closure means 8, so that the first guide surfaces 25 of the engagement elements 24 are in contact with the second guide surfaces 28 of the recess 27. The parts of the closure means 8 can thus be moved between a blocking position and a release position.

In the blocking position, the first guide surfaces 25 of the engagement elements 24 lie over their entire surface on the second guide surfaces 28 of the recesses 27, so that the end faces of the first and second parts 22, 23 lie close to one another, as in FIG Figure 5 shown.

In this blocking position, the hose 5 resting on the inside of the thread 9a is fixed to the removal head 2 with a cuff 17.

When the screw cap is unscrewed, the parts 22, 23 are lifted from one another in that the first guide surfaces 25 slide along the second guide surface 28 falls into the bottle 3.

List of reference symbols

(1)

Withdrawal system

(2)

Extraction head

(3)

bottle

(4)

liquid

(5)

hose

(5a)

interface

(5b)

Shaping

(6)

management

(7)

pump

(8th)

Closure means

(9)

inner thread

(9a)

thread

(10)

Headboard

(11)

connection

(12)

check valve

(13)

Ball valve

(14)

Guide channel

(15)

Fasteners

(16)

feather

(17)

cuff

(18)

Groove

(19)

Bullet

(20)

drilling

(21)

head Start

(22)

First part

(23)

Second part

(24)

Engagement element

(25)

First guide surface

(26)

head Start

(27)

Recess

(28)

Second guide surface

Claims (15)

Hose (5) for a withdrawal system (1) with an interface (5a) for detachable connection to a withdrawal head (2) of the withdrawal system (1), so that the hose (5) is a disposable part for withdrawing liquid (4) from a Container is usable. Hose (5) according to Claim 1, characterized in that the interface (5a) is designed for connection (11) to different extraction heads. Hose (5) according to one of Claims 1 or 2, characterized in that the interface (5a) is formed by a plastic part fastened to the hose (5). Method for withdrawing liquid (4) from a container by means of a withdrawal system (1), characterized in that a withdrawal head (2) is attached to the container by means of a closure means (8), with a hose (5) by means of an interface (5a ) is provided, by means of which the hose (5) is detachably attached to the extraction head (2), and the hose (5) is used as a disposable part for removing liquid (4) from the container. Removal system (1) according to Claim 4, characterized in that the removal head (2) has locking means which fix the tube (5) in the removal head (2) in a locking position. Withdrawal system (1) according to Claim 5, characterized in that the locking means are transferred into a release position by means of an actuating mechanism in which they release the hose (5). Withdrawal system (1) according to claim 6, characterized in that the locking means are formed by balls (19) which are slidably mounted in bores (20) of a guide channel (14), the hose (5) being guided in the guide channel (14) will. Withdrawal system (1) according to claim 7, characterized in that in the locking position the balls (19) are pressed against the hose (5) with a pressing force, whereby the hose (5) is fixed in position, and that in the release position the balls (19 ) from the hose (5). Method according to claim 5, characterized in that the hose (5) is detachably attached to the removal head (2) by means of the closure means (8), the hose (5) being automatically detached from the removal head (2) when the closure means (8) is opened . Method according to claim 6, characterized in that the closure means (8) has two parts which can be moved relative to one another into a blocking position in which the hose (5) is fixed on the removal head (2), and which can be moved relative to one another into a release position can be moved, in which the hose (5) is detached from the removal head (2). Method according to claim 10, characterized in that when the closure means (8) is opened to detach the removal head (2) from the container, the parts of the closure means (8) are automatically transferred into the release position. Method according to one of Claims 1 to 11, characterized in that the closure means (8) is in the screw closure. Method according to one of Claims 11 or 12, characterized in that when the screw cap is unscrewed, the parts of the closure means (8) are transferred into the release position. The method according to any one of claims 10 - 13, characterized in that the first part (22) of the closure means (8) has engagement segments protruding beyond one of its end faces, each with first guide surfaces (25), and that the second part (23) of the closure means ( 8) has recesses (27) with second guide surfaces (28) opening out on its end face, the first part (22) being moved against the second part (23) in which the first guide surfaces (23) are moved between the release position and the blocking position. 25) can be moved on the second guide surfaces (28). Method according to claim 14, characterized in that in the blocking position the end faces of the parts lie close to one another and that in the release position the parts are lifted from one another.

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