DE20010888U1 - Handheld pump - Google Patents

Description

BOEHMERT & BOEHMERT

LAW FIRM

Boehmert & Boehmert · Helene-Lange-Straßc 3 · D-14469 Potsdam

German Patent and Trademark Office
Zweibrückenstr. 12

80297 Munich

DR.-1NG. KARL BOEHMERT, PA (ISW-IOT) DIPL.-ING ALBERT BOEHMERT, PA (l'KE-ITO) WILHELM J. H. STAHLBERG, Attorney-at-Law, Bremen DR.-ING. WALTER HOORMANN. PA·, Bremen DlPL-PHYS. DR. HEINZ GODDAR.PA·,Some DR.-ING. ROLAND LIESEGANG. PA·. Monthen WOLF-DIETER KUNTZE, RA, Brawn. Alieanle DIPL.-PHYS. ROBERT MONZHUBER, PA (IM)-ITO) DR. LUDWIG KOUKER, Attorney at Law Bremen DR. (CHEM.) ANDREAS WINKLER, PA-, Brancn MICHAELA HUTH-DIERIG, RA. Monehen DIPL.-PHYS. DR. MARION TONHARDT, PA·. Dusseldorf DR. ANDREAS EBERT-WEIDENFELLER, LAWYER Bremen DIPL.-ING. EVA LIESEGANG, PA·. Some DR. AXEL NORDEMANN, RA. Berlin DIPL.-PHYS. DR. DOROTHEE WEBER-BRULS, &Rgr;&Lgr;·, Fr»nklurt DIPL.-PHYS. DR. STEFAN SCHOHE. PA·. Monchu, DR.-ING. MATTHIAS PHILIPP, PA·, Bielefeld DR. JAN BERND NORDEMANN, LL.M.. RA. Berlin

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RA - RechtsmwaJl/Allivney al law

• - European Patent Attorney

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IWeuiunal Re[*e«nialk>n il lh* Coniinunily TnMlenuli Ollkc Ali PROF. DR. WILHELM NORDEMANN, RA, BRB ¹ DIPL.-PHYS. EDUARD BAUMANN, PA·, Hohenkirdicn DR.-ING. GERALD KLOPSCH, PA·, Dltaehlorf DIPL.-ING. HANS W. GROENING, PA·. Munich DIPL.-ING. SIEGFRIED SCHlRMER, PA·, Bielefeld . DIPL.-PHYS. LORENZ HANEWINKEL, PA·, Paderborn DIPL-ING. DR. JAN TONNIES. PA, RA, Kiel DIPL.-PHYS. CHRISTIAN BIEHL, PA·, Kiel MARTIN WlRTZ, BA, Düsseldorf DR. DETMAR SCHÄFER, RA, Bremen DIPL.-PHYS. DR.-ING. UWE MANASSE, PA·. Bremen DR. CHRISTIAN CZYCHOWSKI. RA, Berlin DR. CARL-RICHARD HAARMANN, RA. Munich DIPL-BIOL. DR. ARMIN K. BOHMANN, PA, Munich DIPL.-PHYS. DR. THOMAS L. BITTNER, PA·. Berlin DR . VOLKER SCHMITZ, RA, Munich DR. FRIEDRICH NICOLAUS HEISE, RA, &Rgr;&ogr;&ohgr;™ DIPL.-PHYS. CHRISTIAN W. APPELT, PA, Munich DR. ANKE NORDEMANN-SCHIFFEL, RA=, Potsd™ KERSTIN MAUCH , LL.M., RA. Pofcdum

In cooperation with DIPL.-CHEM. DR. HANS ULRICH MAY. &Rgr;&Lgr;·. Maichen

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New registration (utility model)

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T55015

Günther Theiler

Am Liliensteig 22

14542 Werder (Havel) Potsdam,

19 June 2000

Hand pump

The invention relates to a hand pump for conveying a liquid with a liquid supply section, a liquid discharge section, a manual conveying device arranged between the liquid supply section and the liquid discharge section for generating a suction pressure and a bottom valve arranged between the liquid supply section and the liquid discharge section in the suction direction in front of the manual conveying device, wherein the liquid during suction passes via a conveying path from the liquid supply section to the liquid discharge section.

Helene-Lange-Straße 3 ■ D-14469 Potsdam ■ Telephone+49-331-275430 · Fax+49-331-2754321
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Such hand pumps are increasingly being used in small gardens or home gardens to pump domestic water from small local wells. The pumping device is used to generate suction pressure in a suction pipe. The suction pressure causes a bottom valve in the suction pipe to open, so that water is sucked in from a water reservoir and discharged via the liquid discharge section. The bottom valve has the main task of allowing water to be sucked in when the pumping device generates suction pressure in the suction pipe. The bottom valve also prevents the sucked-in water from flowing back from the area of the suction pipe above and below the bottom valve into the water reservoir. This maintains a standing water column.

However, the manual operation of the hand pump is only suitable for pumping smaller amounts of water, for example for filling a watering can.

The object of the present invention is to provide a possibility for connecting a further pump, in particular an electric pump, to a hand pump of the type mentioned at the beginning.

This object is achieved in a hand pump according to the preamble of claim 1 in that a further valve is arranged between the bottom valve and the manual conveying device for closing and opening the conveying section, which has an attachment piece for connecting a further pump, in particular an electric pump, on a side wall surrounding the conveying section between the further valve and the bottom valve, that a through opening is formed in the attachment piece which is connected to the conveying section, that the further valve closes when a suction pressure is introduced into the conveying section via the through opening in the attachment piece, and that the further valve opens when a suction pressure is generated in the conveying section with the aid of the manual conveying device.

KQEHMERT. A 30EHME-RT. ·

The invention includes the essential basic idea of providing a further valve behind the bottom valve in the suction direction, so that it is possible to arrange the attachment piece for connecting a further pump at any point between the bottom valve and the further valve. In this way, it is possible to arrange the attachment piece in an area of the hand pump that is above the surface of the earth. With the help of the additional pump, larger quantities of water can also be pumped.

A preferred development of the invention with regard to the user-friendliness of the hand pump provides that the additional valve is an automatic valve.

A simple and reliable mechanical construction of the further valve, even with frequent use, is achieved in an expedient embodiment of the invention in that the further valve has a base plate with a plurality of openings and a valve component which can be displaced between an open position in which the valve component releases the plurality of openings and a closed position in which the valve component closes the plurality of openings so that the further valve is closed.

In a preferred development of the invention, a mechanically reliable arrangement of the base plate is achieved in that the base plate is formed in one piece with the surrounding side wall.

In an expedient embodiment of the invention, it can be provided that the valve component can be moved between the open position and the closed position. This ensures that the valve component can be moved reliably even if the other valve is operated frequently.

In an advantageous embodiment of the invention, sufficient sealing of the further valve is achieved in that a displaceable seal is arranged between the base plate and the valve component.

A preferred embodiment of the invention with regard to a complete offer provides that another valve is arranged on the attachment piece, so that the through opening can be closed with the aid of the other valve.

In order to ensure a mechanically simple construction and to minimize manufacturing costs, an expedient development of the invention may provide that the other valve is a manually operable valve.

In order to enable a convenient and inexpensive connection of the additional pump, a preferred embodiment of the invention can provide for the attachment piece to be arranged in an above-ground section of the hand pump.

A preferred development of the invention provides that the additional valve and the attachment are formed on a separately mountable, retrofittable component. This creates the possibility of retrofitting already installed hand pumps in such a way that the advantages of the present invention are achieved.

An embodiment of the invention which is expedient with regard to simple assembly of the retrofittable built-in part provides that an at least partially circumferential recess is formed on an upper end face of the side wall of the built-in part for positioning an upper part of the hand pump adjacent to the attachment part.

An embodiment of the invention which is advantageous with regard to the mechanical strength of the hand pump provides that the installation part is provided with several longitudinally

of the fixture, wherein the plurality of bolts are mounted outside the side wall of the fixture.

In an expedient further development of the invention, a simple assembly of the built-in part with regard to the mechanical effort is achieved in that the built-in part is placed on an intake pipe.

In a preferred embodiment of the invention, the retrofittable attachment is achieved in that the installation part is placed on a flange component arranged on the intake pipe.

The invention is explained in more detail below using an exemplary embodiment with reference to a drawing.

Figure 1 is a schematic representation of a hand pump with a bo

valve and another valve partly in cross section;

Figures 2A, 2B show an enlarged view of a partial section of the hand pump according to Figure 1, with a built-in part inserted or removed;

Figures 3A, 3B show a schematic representation of a built-in part with the further valve in

a basic position or an open position in cross-section; and

Figure 4 shows the installation part according to Figure 2 from above, with a valve component removed.

Figure 1 shows a hand pump 1 in cross section. By operating a pumping device 2, a suction pressure is generated in an area of an interior 3 of the hand pump 1 below the pumping device 2. The suction pressure is used to pump water from an underground reservoir 4 through the interior 3. The interior 3 forms a conveying path for the water to be pumped from the underground reservoir 4. The conveying path can be opened to allow the water to flow through or to interrupt the water conveyance using a bottom valve 5 and another valve 6.

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According to Figure 1, the bottom valve 5 is arranged above an earth surface 7. However, it can also be provided that the bottom valve is arranged at the level of the earth surface 7 or below the earth surface 7 in the interior space 3 (not shown).

The interior space 3 is formed on the side of the hand pump 1 facing the underground reservoir by means of a suction pipe 8. If a suction pressure is generated in the interior space 3 with the aid of the conveying device 2, the bottom valve 5 and the further valve 6 open so that, as a result of the suction pressure generated, water from the underground reservoir 4 can pass through the suction pipe 8, the bottom valve 5, an area 9 of the interior space 3 between the bottom valve 5 and the further valve 6 and through the further valve 6. The bottom valve 5 and the further valve 6 are each designed in such a way that a backflow of water which passes from the underground reservoir 4 through the respective valve is prevented. This is achieved in the case of the bottom valve 5, for example, by the bottom valve 5 closing automatically when water in the area 9 of the interior space 3 exerts a return pressure on the bottom valve 5.

The described design of the bottom valve 5 and the further valve 6 ensures that a water column is maintained above and below the respective valve.

The conveyance of water with the aid of the manually operable conveying device 2 requires that a through opening 10, which is formed in an extension piece 11, is closed. For this purpose, a preferably manually operable shut-off valve 13 is mounted on a distal end 12 of the extension piece 11, which is shown schematically in Figure 1. With the aid of the shut-off valve 13, a water flow from the through opening 10 of the extension piece 11 into a connecting hose 14 can be released or interrupted. The connecting hose 14 is connected to a further pump 15, which is preferably designed as an electric pump. If the shut-off valve 13 is opened, a suction pressure can be generated in the area 9 of the interior 3 with the aid of the further pump 15. This suction pressure leads to the further valve 6 closing and the floor

valve 5 opens so that water can be sucked in from the underground reservoir 4. In this case, the sucked-in water passes through the through-opening 10 in the attachment piece 11, through the shut-off valve 13 and the connecting hose 14 to the further pump 15.

According to Figure 1, the attachment piece 11 is formed on a built-in part 16. The built-in part 16 is placed, preferably screwed, on the intake pipe 8 in the area of a flange connection 17. An upper part 19 of the hand pump 1 is arranged on an upper face 18 of the built-in part 16 and is fastened to the flange connection 17 by means of bolts 20. The manner of arranging the attachment piece 11 with the help of the built-in part 16 described with reference to Figure 1 has the advantage that the built-in part 16 can be retrofitted to hand pumps that initially do not provide a connection for the additional pump 15. In addition, there is the advantage that the built-in part 16 can be removed again if there is no further need for it.

Figures 2A and 2B show an enlarged section of the hand pump 1 in the area of the built-in part 16. Figure 2A shows the section without the built-in part 16, while the built-in part 16 is installed in the illustration in Figure 2B. According to Figures 2A and 2B, a gap 52 is formed between an upper part 50 and a lower part 51 of the flange connection 17. The upper part 50 is screwed onto the intake pipe 8 and fastened to the lower part 51 by means of screw connections 53. The built-in part 16 has a circumferential edge 55 in an upper edge region 54 for positioning the upper part 19. In contrast to the illustration in Figure 2B, in another embodiment (not shown) a precise fit of the upper part on the installation part 16 can be provided, so that a side surface 56 of the upper part 19 and a side surface 57 of the installation part 16 are arranged adjacent to one another.

If a suction pressure is generated by means of the manual conveying device 2 (see Figure 1), the bottom valve 5 and the further valve 6 open and water can flow through both valves, as shown schematically in Figure 2B with arrows B.

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Figures 3A and 3B show a schematic partial representation of another embodiment of the built-in part 16 with the top part 19 attached in cross section. A side wall 40 of the built-in part 16 is formed in one piece with a base plate 21. The base plate 21 has several openings 22. A valve component 24 is mounted displaceably in a central opening 23. In Figure 3A, the valve component 24 is shown in a basic position. In the basic position, the valve component 24 rests on the base plate 21, with a seal 27 arranged between a lower surface 25 of the valve component 24 and a cover surface 26 of the base plate in order to tightly close the several openings 22 in the basic position of the valve component 24.

If a suction pressure is generated in the interior 3 with the aid of the conveying device 2 (cf. Figure 1), the valve component 24 moves in a direction which is shown in Figure 3B by means of an arrow A. The valve component 24 moves until a widened base section 28 of the valve component 24 abuts a lower surface 29 of the base plate 21. The seal 27 also moves as shown in Figure 3B. The widened base section 28 of the valve component 24 is formed in the embodiment according to Figures 3A and 3B with the aid of a screw head of a screw 30 screwed into the valve component 24. In the open position of the valve component 24, the plurality of openings 22 are exposed so that sucked-in water can pass through the plurality of openings 22.

According to Figures 3A and 3B, a recess 32 is formed on an upper end face 31 of the side wall 40, in which a further seal 33 is mounted. The recess 32 serves to center the upper part 19 when the built-in part 16 is mounted in the hand pump 1. The built-in part 16 can be made of brass, for example. However, to reduce manufacturing costs, it can also be provided that the built-in part 16 is made as a cast part.

Figure 4 shows a view of the built-in part 16 from above. In the embodiment shown, the multiple openings 22 are arranged along concentric circles around the central opening 23. However, the multiple openings 22 can be arranged in any position

with respect to the central opening 23 (cf. Figures 2A and 2B or 3A and 3B). The number of the multiple openings and their respective cross-sectional areas can also differ in different embodiments. In order to avoid unintentional resistance for the sucked-in water in the area of the multiple openings 22, however, it is essential that the sum of the cross-sectional areas of the multiple openings 22 is greater than or equal to the cross-sectional area of the intake pipe 8.

When arranging the multiple openings, it is expedient that none of the multiple openings 22 are formed in a region of the base plate 21 which is arranged below an edge region 33 of the valve component 24 in order to achieve a sufficient sealing effect in the edge region 33 which, when water is sucked in via the through-opening 10 in the extension piece 11, prevents water from penetrating into one of the multiple openings 22 from a region above the valve component 24 (see Figures 2A and 2B).

The features of the invention disclosed in the above description and the drawings can be important both individually and in any combination for the realization of the invention in its various embodiments.

Claims (15)

1. Hand pump ( 1 ) for conveying a liquid with a liquid feed section, a liquid discharge section, a manual conveying device ( 2 ) arranged between the liquid feed section and the liquid discharge section for generating a suction pressure and a bottom valve ( 5 ) arranged between the liquid feed section and the liquid discharge section in the suction direction in front of the manual conveying device ( 2 ), wherein the liquid during suction passes over a conveying section from the liquid feed section to the liquid discharge section, characterized in that a further valve ( 6 ) is arranged between the bottom valve ( 5 ) and the manual conveying device ( 2 ) for closing and opening the conveying section; that an attachment piece ( 11 ) for connecting a further pump ( 15 ), in particular an electric pump, is arranged on a side wall ( 40 ) surrounding the conveying section between the further valve ( 6 ) and the bottom valve ( 5 ); that a through opening ( 10 ) is formed in the extension piece ( 11 ) which is connected to the conveying section; that the further valve ( 6 ) closes when a suction pressure is introduced into the conveying section via the through opening ( 10 ) in the extension piece ( 11 ); and that the further valve ( 6 ) opens when a suction pressure is generated in the conveying section with the aid of the manual conveying device ( 2 ). 2. Device according to claim 1, characterized in that the further valve ( 6 ) is an automatic valve. 3. Device according to claim 1 or 2, characterized in that the further valve ( 6 ) has a base plate ( 21 ) with a plurality of openings ( 22 ) and a valve component ( 24 ) which can be displaced between an open position in which the valve component ( 24 ) releases the plurality of openings ( 22 ) and a closed position in which the valve component ( 24 ) closes the plurality of openings ( 22 ) so that the further valve ( 6 ) is closed. 4. Device according to claim 3, characterized in that the base plate ( 21 ) is formed integrally with the surrounding side wall ( 40 ). 5. Device according to claim 3 or 4, characterized in that the valve component ( 24 ) is displaceable between the open position and the closed position. 6. Device according to one of claims 3 to 5, characterized in that a displaceable seal ( 27 ) is arranged between the base plate ( 21 ) and the valve component ( 24 ). 7. Device according to one of the preceding claims, characterized in that another valve ( 13 ) is arranged on the extension piece ( 11 ), so that the through opening ( 10 ) can be closed with the aid of the other valve ( 13 ). 8. Device according to claim 7, characterized in that the other valve ( 13 ) is a manually operable valve. 9. Device according to one of the preceding claims, characterized in that the attachment piece ( 11 ) is arranged in an above-ground section of the hand pump ( 1 ). 10. Device according to one of the preceding claims, characterized in that the further valve ( 6 ) and the attachment piece ( 11 ) are formed on a separately mountable, retrofittable installation part ( 16 ). 11. Device according to claim 10, characterized in that for positioning an upper part ( 19 ) of the hand pump ( 1 ) adjacent to the built-in part ( 16 ), an at least partially circumferential recess ( 32 ) is formed on an upper end face ( 31 ) of the side wall ( 40 ) of the built-in part ( 16 ). 12. Device according to claim 10 or 11, characterized in that the built-in part ( 16 ) is held by means of several bolts ( 20 ) running in the longitudinal direction of the built-in part ( 16 ), wherein the several bolts ( 20 ) are mounted outside the side wall ( 40 ) of the built-in part ( 16 ). 13. Device according to one of claims 10 to 12, characterized in that the built-in part ( 16 ) is placed on an intake pipe ( 8 ). 14. Device according to one of claims 10 to 12, characterized in that the built-in part ( 16 ) is placed on a flange component ( 50 ) arranged on the intake pipe ( 8 ). 15. Installation part ( 16 ) for retrofitting in an area of a conveying path between a manual conveying device ( 2 ) and a bottom valve ( 5 ) of a hand-operated pump ( 1 ), wherein the installation part ( 16 ) has a side wall ( 40 ), an interior space surrounded by the side wall ( 40 ) and provided with an inlet and an outlet opening, and an attachment piece ( 11 ) formed on the side wall ( 40 ) for connecting a further pump ( 15 ), in particular an electric pump, wherein a through opening ( 10 ) formed in the attachment piece ( 11 ) is connected to the interior space, and wherein a valve ( 6 ) is arranged in the area of the outlet opening such that the outlet opening is closed by means of the valve ( 6 ) when a suction pressure is introduced into the interior space via the through opening ( 10 ), and that the outlet opening is open when on the output side the outlet opening a suction pressure acts on the valve ( 6 ).