DE8808360U1 - Filling pump - Google Patents

Description

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Filling pump

The innovation concerns a filling pump for dosing liquid to pasty filling material into cup-shaped containers according to the generic term of the main claim*

Such filling pumps are known, for example, from DE-OS 35 43 504 , whereby it is usual for such dosing devices to combine a large number of individual filling pumps into a single unit in order to be able to simultaneously fill cups arranged underneath in a corresponding distribution of volume. The design of such filling pumps has so far been such that the cylinders are introduced as bores into a cylinder block, which is then arranged on a valve block, for example, according to the above-mentioned DE-OS. It is also known to combine the cylinder block and valve block into a single unit in which valve slides are then arranged in a suitable manner or in which the pistons can work as nested valve and dosing pistons. Apart from the material expenditure, such cylinder blocks represent complex and expensive structural units, and the innovation is therefore based on the task _of being able to make such filling pumps significantly simpler and more cost-effective, without affecting their proven functionality.

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This task is solved with a filling pump of the type mentioned at the beginning according to the innovation by the features stated in the characterizing part of the main claim. Advantageous further developments and practical embodiments arise from the subclaims.

Thanks to the new design, the creation of the required pump cylinders is limited to the manufacture of simple pipe sections, which can be easily cut to length from continuous pipe material made of suitable material. After machining the piston running surfaces, these pipe sections are arranged in a corresponding grid distribution over corresponding openings in the valve block and clamped in a suitable manner with the closure of the filling material chamber against the valve block, which thereby simultaneously forms the floor of the filling material chamber.

By maintaining this design and arrangement principle, various design options are advantageously available. The pipe section of each individual filling pump can be designed and arranged to protrude above the closure of the filling material chamber. In this case, the pipe sections are expediently and advantageously provided with a container closure support shoulder, onto which the respective

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opening wire of the plate-shaped closure places*

If it is desired that the pistons also exert a suction effect on the filling material when they descend (dosing process) and that filling material is to be sucked into the filling material chamber, the pipe sections forming the cylinders must be provided with openings above their piston stroke. Instead of such openings, the arrangement and design of the cylinders can also be such that an intermediate element is arranged between the upper end of the pipe section and the closure of the filling material chamber, which will be explained in more detail below. In the interest of precise adjustment of the cylinders to their pistons, pipe section seat recesses are advantageously provided in the valve block, which can also be used to insert a seal.

The new filling pump is explained in more detail below using drawings of exemplary embodiments.

It shows schematically

Fig. 1 shows a longitudinal section through an embodiment of the filling pump;

Fig. 2 shows a corresponding longitudinal section through the filling pump in another embodiment;

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Fig. 3 is a longitudinal section through a filling pump cylinder in a special embodiment;

Fig. '\ a section along line IV-IV in Fig. 3}

Fig. 5 shows a further section through a filling pot cylinder in another embodiment;

Fig. 6 is a section along line VI-VI in Fig. 5 and Fig. 7 is a plan view of the filling pump according to Fig. 1.

For all embodiments, the filling pump consists of at least a dosing cylinder 1 with a piston 2 that moves up and down in synchronism and a valve block 3 arranged underneath with a closing, suction and opening valve 5 that leads to a filling mouthpiece U and can be actuated in synchronism for sucking from a storage container (not shown) into the filling material chamber and for spraying out the filling material.

As can be seen from Fig. 1, the filling pump is designed in such a way that the filling material chamber 6 is arranged directly on the valve block 3 and this forms the bottom of the filling material chamber 6, whereby the cylinder 1 sealed against the valve block 3 is arranged in the form of a pipe section 8 between the valve block 3 and the upper closure 7 of the filling material chamber 6.

In the valve block 3, next to the pipe section 8, there is a filling material suction channel 10 which is open to the interior 9 of the chamber 6 and leads to the suction position side 11 of the valve 5, which is known in this form and does not require any further explanation with regard to its design and function. In plan view, this embodiment is shown in Fig. 7, i.e. in this embodiment the entire dosing device consists of a total of twelve small filling pump units, the pistons 2 of which are connected to a lifting drive 19 via piston rods ^21. As can be seen, in this embodiment the pipe sections 8 forming the cylinders 1 protrude beyond the closure 7, the pipe sections 8 being provided with a chamber closure support shoulder 12 on which the corresponding opening edges of the closure 7 designed as a plate rest and which fix the pipe sections 8 against the valve block 3. The pipe sections are sealed against the plate forming the closure 7 with simple ring seals 21 in order to seal the interior 9 of the filling chamber 6, which is under filling material pressure, from the outside (see Fig. 5). The filling material is supplied from a larger storage container (not shown) through a corresponding connection piece 20. During the suction stroke of the pistons 2, the filling material passes from the interior 9 through the filling material suction channels 10 into the cylinder 1 below the piston 2 when the valves 5 are in the lower position, as shown. By maintaining the same design principle, the

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Filling pump can also be designed in the sense of the embodiment according to Fig. 2, in which the pipe sections 8 do not reach through the plate forming the closure 7 at the top, but are flush with the inner surface of the plate. The plate or closure 7 then only has corresponding through-openings for the piston rods ^21. If the piston rods ²¹ are guided precisely and tightly in the corresponding openings of the plate, it is expedient to make holes 18 in the plate to ventilate the top of the piston. Otherwise, however, this embodiment corresponds to that according to Fig. 1, apart from the difference described.

If, as mentioned above, suction is to be exerted on the interior 9 and thus on the filling material flowing in through the connection 20 during dosing, the simple construction principle described above can also be used for this. According to Fig. 3, the pipe section 8 above the piston stroke 13 is simply provided with openings 14, as shown, between which, as can be seen from Fig. H , the cylinder wall remains in the form of upwardly extending webs. In this way, the bracing principle of the pipe sections 8 between the cylinder block 3 and the closure 7 can also be implemented here. Advantageous and with regard to perfect cleaning options.

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However, the embodiment according to Fig. 5 is preferred, in which an intermediate element 15 in the form of a so-called lantern is formed between the upper end 8' of the pipe section 8 and the closure 7 of the filling material chamber 6, between whose webs 14' the large-area openings 14 are located. The webs are set back in relation to the diameter of the piston 2, so that after it has been raised to the cleaning position, it is perfectly accessible to the cleaning medium in all areas.

Regarding the connection of the pipe sections 8 to the cylinder block, reference is made to Fig. 5, which, however, applies to all the previously described embodiments. For this connection of the pipe sections 8, a pipe section seat recess 16 is provided in the valve block 3, in which a small groove with a ring seal is arranged at the bottom, as shown, or at the side. The representation and description of obvious structural details, such as the storage container side wall, screwable and sealable assignment of the closure 7 to the side wall, arrangement and design of the filling mouthpieces, etc., are omitted, since these are easily conceivable.

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Claims (6)

Patent Attorney· Dlpi.-&idiagr;&eegr;&sfgr;. Amthor - 1 - CI5 9Ö4J An der Mainbrücke «450 Hanau Protection claims: 1. Filling pump for dosing liquid to pasty filling material into cup-shaped containers, consisting of at least one dosing cylinder with a piston that can be moved up and down in sync and a valve block located underneath with a closing, suction and opening valve that can be operated in sync leading to a filling mouthpiece for sucking in from a storage container and dosing out the filling material, characterized in that a filling material chamber (6) is arranged directly on the valve block (3) and this forms the bottom of the filling material chamber (6), that the cylinder (1) sealed against the valve block is arranged in the form of a pipe section (8) between the valve block (3) and the upper closure (7) of the filling material chamber (6), and that in the valve block (3) next to the pipe section (8) there is provided a filling material suction channel (10) that is open to the interior (9) of the container (6) and this is connected to the suction position side (11) of the valve (5). 2. Filling pump according to claim 1, characterized in that the pipe piece (8) is placed above the closure (7) of the t i * it · * * ji AA *· 4« · * ti 4 «4* * t !■Please· ti ■■ «· "■ 13» »II . . · · 1 I I t ■■·· · « ■"■ ■ · III Il I·· ·· ' 11 Il ti I» ·· ^&Ggr; · -Z- Filling material chamber (6) is designed and arranged in a protruding manner. 3. Filling pump according to claim 1 or 2, characterized in that the pipe section (8) is provided with a chamber closure support shoulder (12). 4. Filling pump according to claim 1,
characterized in that the pipe section (8) is provided with openings (14) above its piston stroke (13). 5. Filling pump according to claim 4,
characterized in that an intermediate element (15) is arranged between the upper end (8·) of the pipe section (8) and the closure (7.) of the filling material chamber (6). 6. Filling pump according to one of claims 1 to ₅ , characterized in that a pipe seat recess (16) and a seal (17) are arranged in the valve block (3). i * *· · t «4 · ttt t &igr;