Withdrawal system

Abstract

A withdrawal system (1) for a container (2) and comprises an immersion pipe (4) mounted on and projecting into the container (2) as well as a withdrawal head (5) that is attachable to the immersion pipe (4) by means of a rotary connection. The withdrawal head (5) attached to the immersion pipe (4) is secured by means of a mechanical locking unit.

Claims

1. A withdrawal system (1) for a container (2) comprising an immersion pipe (4) mounted on and projecting into the container (2) and having a withdrawal head (5) that is attachable by means of a rotary connection to the immersion pipe (4), characterized in that the withdrawal head (5) attached to the immersion pipe (4) is secured by means of a mechanical locking unit, characterized in that the mechanical locking unit has an actuation element that is movable into a locking position and into a release position, wherein in the locking position the actuation element locks the rotary connection between withdrawal head (5) and immersion pipe (4), and in the release position the actuation element releases the rotary connection between withdrawal head (5) and immersion pipe (4) wherein the mechanical locking unit has a locking element (12) firmly connected to the immersion pipe (4), said locking element having a discrete array of projections (15) running in the circumferential direction around the immersion pipe (4), the actuation element being secured at a projection (15) or between two projections (15) when in the locking position.

2. The withdrawal system according to claim 1, characterized in that the actuation element is a sliding element (20).

3. The withdrawal system according to claim 2, characterized in that the sliding element (20) is displaceable along an axis running parallel to the longitudinal axis of the immersion pipe (4).

4. The withdrawal system according to claim 1, characterized in that a sliding element (20) that forms the actuation element is latched at a projection (15) or is located in an intermediate space between two projections (15) when in the locking position.

5. The withdrawal system according to claim 4, characterized in that the sliding element (20) has a wall element surrounding a cavity, said cavity terminating at an end face of the sliding element (20), and in that a projection (15) projects into the cavity of the sliding element (20) when the sliding element (20) is in a locking position.

6. The withdrawal system according to claim 1, characterized in that the locking element (12) has an annular segment that surrounds the immersion pipe (4) in the circumferential direction, and in that the projections (15) terminate in the radial direction at the outer edge of the annular segment.

7. The withdrawal system according to claim 6, characterized in that the projections (15) are identically shaped and are arranged at equidistant intervals in the circumferential direction of the annular segment.

8. The withdrawal system according to claim 6, characterized in that pins (13) are provided on the locking element (12) by means of which the locking element (12) is affixed to the immersion pipe (4).

9. The withdrawal system according to claim 1, characterized in that the actuation element is mounted on a collar (11) circumferentially surrounding the withdrawal head (5).

10. The withdrawal system according to claim 9, characterized in that the collar (11) is screwed onto a receptacle of the immersion pipe (4) in order to affix the withdrawal head (5) to the immersion pipe (4).

11. The withdrawal system according to claim 1, characterized in that the withdrawal head (5) is affixed to the immersion pipe (4) by a threaded connection.

12. The withdrawal system according to claim 1, characterized in that liquid can be withdrawn from the container (2) and fed into it via the withdrawal head (5) attached to the immersion pipe (4).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained below in reference to the drawings. The figures show:

(2) FIG. 1: Schematic diagram of a container having a withdrawal system and an associated pump.

(3) FIG. 2: Perspective view of the withdrawal system according to the invention.

(4) FIG. 3: Partially cutaway view of the withdrawal system according to the invention.

(5) FIG. 4: Detailed view of the withdrawal system according to FIGS. 2 and 3 with a sliding element in a release position.

(6) FIG. 5: Detailed view of the withdrawal system according to FIGS. 2 and 3 with a sliding element in a locking position.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(7) FIG. 1 schematically shows a withdrawal system 1 on a container 2. A liquid is stored in the container 2. The liquids that are stored in containers 2 of this type are in particular liquid special components.

(8) A bung body 3 is mounted in a container opening in the cover 2a of the container 2. This bung body 3 holds an immersion pipe 4 as a first component of the withdrawal system 1. The immersion pipe 4 runs in the vertical direction and extends to just above the bottom of the container 2.

(9) A withdrawal head 5 is attached at the upper end of the immersion pipe 4 as another component of the withdrawal system 1, the attachment of the withdrawal head 5 to the immersion pipe 4 generally being designed in the form of a rotary connection, in the present case in the form of a threaded connection.

(10) A piping system 6 that is connected to a pump 7, for example a diaphragm pump, is connected at the withdrawal head 5. When withdrawal head 5 is attached to the immersion pipe 4, liquid can be withdrawn from the container 2 through the piping system 6 by means of the pump 7. Liquid can also be fed into the container 2.

(11) FIGS. 2 and 3 show an exemplary embodiment of the withdrawal system 1 according to the invention.

(12) As is evident from FIGS. 2 and 3, the withdrawal head 5 of the withdrawal system 1 has two connectors 8a, 8b, which are used in particular for the connection of the piping system 6. A head piece 9 is attached with a threaded connection to the top end of the hollow cylindrical immersion pipe 4. The immersion pipe 4 and the head piece 9 have corresponding threads 10a, 10b for this purpose. The head piece 9, which is a component of the immersion pipe 4, is rotationally symmetrically designed and has a flat top side that forms a seating surface 9a. The head piece 9 is mounted in the bung body 3 in the container opening.

(13) The withdrawal head 5 has a base body 5a with a cylindrical outer surface and an axis of symmetry that coincides with the axis of symmetry of the immersion pipe 4 when the withdrawal head 5 is attached to the immersion pipe 4. The lower region of the base body 5a has a slightly smaller width. A collar 11 and a likewise annular locking element 12, which surround the outer surface of the base body 5a, are mounted there as components of the withdrawal head 5. The axes of symmetry of these elements coincide with the axis of symmetry of the withdrawal head 5.

(14) The locking element 12 mounted below the collar 11 has a flat, annular segment that extends in a plane and rests on the seating surface 9a of the head piece 9 of the immersion pipe 4. Pins 13 project from the bottom of the annular segment of the locking element 12. The pins 13 are latched in recesses 14 of the head piece 9 that terminate at the seating surface 9a (FIG. 3). As a result, the locking element 12 is firmly connected to the head piece 9 and, thus, to the immersion pipe 4.

(15) Projections 15, which extend in the plane of the annular segment of the locking element 12, terminate at the outer edge of the annular segment. The projections 15 are identically configured and are arranged at equidistant intervals in the circumferential direction of the locking element 12.

(16) The collar 11 has an annular body 11a at which projection elements 16 terminate in the radial direction (FIG. 2). The quantity, arrangement and cross-sectional contour of the projection elements 16 correspond to the projections 15 of the locking element 12.

(17) As FIG. 3 shows, a hollow-cylindrical connecting piece 17 terminates at the underside of the annular body 11a. The hollow cylindrical connecting piece 17 has male threads 18 that are engaged with female threads 19 of the head piece 9.

(18) While the locking element 12 is firmly connected to the immersion pipe 4 by means of the pins 13, the collar 11 is rotatably mounted. The collar 11 is used to create a threaded connection between withdrawal head 5 and immersion pipe 4 in such a way that the collar 11 is firmly screwed via the male threads 18 of the connecting piece 17 to the female threads 19 of the head piece 9.

(19) As soon as this threaded connection is tightened, the withdrawal head 5 is attached to the immersion pipe 4 and the collar 11 is located in an attachment position.

(20) To secure the attachment position and, thus, the threaded connection formed between withdrawal head 5 and immersion pipe 4, according to the invention an actuation element is provided that in the present case is formed by a sliding element 20. The actuation element together with the locking element 12 forms a mechanical locking unit.

(21) The actuation element is mounted on one of the projection elements 16 of the collar 11, as FIG. 2 shows in particular.

(22) The sliding element 20 is formed by a hollow body that is open on its bottom side. The wall element that surrounds the cavity of the sliding element 20, as FIG. 2 shows, is adapted to the outer contour of the projection element 16. The sliding element 20 can be displaced in the axial direction on the projection element 16that is, in the vertical directionbetween a top end position, which defines a release position, and a bottom end position, which defines a locking position.

(23) In the release position (FIG. 4), the sliding element 20 is located above the locking element 12. In this release position of the sliding element 20, the collar 11 can be turned freely with respect to the locking element 12, in particular in order to form the threaded connection between immersion pipe 4 and withdrawal head 5.

(24) As soon as the threaded connection between immersion pipe 4 and withdrawal head 5 is produced, the connection is secured against inadvertent opening, in particular opening caused by disturbing external influences, solely by moving the sliding element 20, preferably manually, into the locking position.

(25) In the case illustrated in FIG. 5, the projection elements 16 of the collar 11 are located exactly above the projections 15 of the locking element 12 after the threaded connection is produced via the collar 11. In this case, the cavity of the sliding element 20 is slipped over the projection 15 located below the cavity when the sliding element 20 is moved into the locking position, so that the lower edge of the sliding element 20 surrounds the projection 15. As a result, the sliding element 20 is latched at this projection 15, whereby the threaded connection between collar 11 and immersion pipe 4 is locked, which means that the withdrawal head 5 can no longer come loose from the immersion pipe 4 in an uncontrolled manner. A release of the threaded connection is only possible again after the sliding element 20 is pushed upward into its release position.

(26) In the case illustrated in FIG. 2, the projection elements 16 of the collar 11 are located offset with respect to the projections 15 of the locking element 12 after the threaded connection is produced. If the sliding element 20 is pushed into the locking position, (as illustrated in FIG. 2), the sliding element 20 is located between two projections 15. In this way, the collar 11 can only be turned as far as the sliding element 20 can move between the projections 15. However, this small degree of freedom of movement is insufficient to loosen the threaded connection, which means that, also in this case, the threaded connection with which the withdrawal head 5 is attached is secured by the mechanical locking unit against uncontrolled opening.

LIST OF REFERENCE NUMERALS

(27) (1) Withdrawal system (2) Container (2a) Cover (3) Bung body (4) Immersion pipe (5) Withdrawal head (5a) Base body (6) Pipe system (7) Pump (8a, 8b) Connector (9) Head piece (9a) Seating surface (10a, 10b) Threads (11) Collar (11a) Annular body (12) Locking element (13) Pin (14) Recess (15) Projection (16) Projection element (17) Connecting piece (18) Male threads (19) Female threads (20) Sliding element