EP4074977B1 - Submersible pressure pump for liquid and use thereof - Google Patents

Description

The invention relates to a submersible pressure pump for liquid, at least having a pump housing with a housing outlet, a first, large-area housing inlet designed as a suction strainer, and a second, individual housing inlet designed in the bottom of the pump housing, a liquid pump arranged in the pump housing with a liquid-level-dependent or pressure-controlled liquid-level-dependent inlet -/Off switch, and a suction inlet in the liquid pump, wherein in a first suction situation there is a fluidic connection between the suction inlet and the first housing inlet, so that the liquid is sucked in through the large-area first housing inlet, with the second housing inlet being closed, and in a second suction situation, a fluidic connection is established between the suction inlet and the second housing inlet, so that the liquid is sucked in through the single second housing inlet, with an adapter being provided for changing from the first suction situation to the second suction situation, which is designed in such a way that the fluidic Connection between the suction inlet and the first housing inlet interrupted and at the same time the fluidic connection between the suction inlet and the second housing inlet is made.

Furthermore, the invention relates to different uses of a submersible pressure pump.

Submersible pressure pumps are known from the prior art, which can suck in a liquid in different ways. The liquid is either sucked in near the bottom in the lower area of the submersible pressure pump through the large suction strainer or via an additional hose which is connected to the bottom of the pump and floats near the liquid surface by means of a buoyancy unit, so that the liquid is sucked in near the surface. With this so-called floating extraction or suction, the submersible pressure pump is laid on its side in order to be able to connect the hose to the bottom of the pump. However, conventional submersible pressure pumps are not stable on their side on the ground and then roll back and forth. Next is the alternation between the two Suction situations are complex, since the submersible pressure pump has to be partially dismantled for the floating removal, i.e. for the assembly of the hose.

Furthermore, external float switches for submersible pressure pumps are known, which detect a liquid level in order to allow the pump to operate only for liquid levels above a predetermined threshold value, in order to prevent the pump from running dry. These float switches sense a sufficient liquid level by being raised to an upright position by their own buoyancy. However, depending on the configuration of the previously known floating switches, the buoyancy is very low.

As the state of the art, reference is made to the publications WO 2018/162044 A1 , U.S. 2019/120233 A1 and U.S. 2019/154039 A1 referred.

It is therefore the object of the invention to provide an improved submersible pressure pump for a horizontal suction situation.

This object is solved by the features of the independent patent claims. Advantageous developments of the invention are the subject matter of subordinate claims.

The inventors have recognized that the change in intake situation or the necessary change to the submersible pressure pump can be carried out without tools, without having to at least partially disassemble the submersible pressure pump. A simple adapter is suitable for this, which can be inserted into the submersible pressure pump without tools, so that one or the other suction situation is created depending on the design of the adapter.

Furthermore, the inventors have recognized that an external float switch experiences improved buoyancy if its righting moment varies in size depending on the area of the float switch.

Accordingly, the inventors propose a submersible pressure pump for liquid, at least having a pump housing with a housing outlet, a first, large-area housing inlet designed as a suction strainer, and a second, individual housing inlet designed in the bottom of the pump housing, a liquid pump arranged in the pump housing with a liquid-level-dependent or pressure-controlled on/off circuit, and a suction inlet in the liquid pump, wherein in a first suction situation there is a fluidic connection between the suction inlet and the first housing inlet, so that the liquid is sucked in through the large-area first housing inlet, the second housing inlet is closed, and in a second suction situation a fluidic connection is established between the suction inlet and the second housing inlet, so that the liquid is sucked in through the single second housing inlet, with an adapter being provided for changing from the first suction situation to the second suction situation, which is designed such that the fluidic connection between the suction inlet and the first housing inlet is interrupted and at the same time the fluidic connection between the suction inlet and the second housing inlet is established, to the effect that at least one handle is provided laterally at the upper end of the pump housing, which at the upper End is flattened, so that the at least one handle forms a lateral three-point-like contact surface together with a middle panel part of the submersible pressure pump, so that the submersible pressure pump is stable on one side in the second suction situation and the at least one handle rolls back and forth the submersible pressure pump is prevented.

The liquid is preferably water. In principle, however, any other liquid can also be sucked in and pumped with the submersible pressure pump according to the invention.

In the following description of a submersible pressure pump and its function and use, only the features essential to the invention are discussed.

The submersible pressure pump according to the invention has a pump housing. Furthermore, according to the invention, the pump housing has a housing outlet and two housing inlets. The first housing inlet is designed as a suction strainer with a large-area suction grille and represents a large-area inlet with a large number of openings such as round holes, slots or the like. The openings of the first housing inlet are formed on the side, but preferably in the lower area of the pump housing. The second housing inlet is formed as a single opening in the bottom of the pump housing.

The pump housing can be made in one piece or in several pieces. Furthermore, to protect the pump housing and to improve handling of the submersible pressure pump, a cladding of the pump housing can be provided. The cladding is designed in one piece or in several pieces. In a particularly favorable embodiment, the paneling has a multi-part design and comprises at least an upper paneling part, a middle paneling part and a lower paneling part.

Furthermore, the submersible pressure pump has a liquid pump arranged in the pump housing with a liquid level-dependent or pressure-controlled on/off switch and a suction inlet in the liquid pump, through which the liquid is sucked in through one of the housing inlets and then enters the liquid pump. There is therefore basically a fluidic connection between the suction inlet and the housing inlets. The liquid pump includes, for example, three or four impellers, which generate the negative pressure required to suck in the liquid. Other embodiments of the liquid pump are also possible.

Depending on the suction situation, the liquid is either sucked in through the first housing inlet or the second housing inlet. Correspondingly, in the first intake situation, a fluidic connection is formed between the suction inlet and the first housing inlet, with the second housing inlet being closed, for example by means of a screw cap or a cap with a bayonet lock or an insertable cap such as a rubber cap or the like. The liquid is then sucked in through the large-area first housing inlet. In the second suction situation, a fluidic connection is established between the suction inlet and the second housing inlet, while at the same time the fluidic connection between the suction inlet and the first housing inlet is interrupted, so that the liquid is suctioned through the single second housing inlet.

According to the invention, an adapter is used to switch from the first suction situation to the second suction situation. This adapter is used in the second housing inlet instead of the conventional closure, which closes the second housing inlet in the floor in the first intake situation. The adapter is preferably equipped with an additional sealing ring for sealing the Suction thread provided opposite the intake port of the impeller. In the second suction situation, the adapter on the one hand interrupts the fluidic connection between the suction inlet and the first housing inlet and on the other hand establishes the fluidic connection between the suction inlet and the second housing inlet. The suction situation is thus changed in a simple manner by exchanging the cover in the second housing inlet for the adapter or vice versa. This is advantageously done without tools. Furthermore, it is advantageously not necessary to dismantle parts of the submersible pressure pump, in particular parts of the pump housing, to change the intake situation.

A simple embodiment provides that the adapter is designed as a cover which can be inserted into the second individual housing inlet. For example, the adapter is designed as a screw cap or as a cap with a bayonet lock or as a plug-in cap such as a rubber cap or the like. The insertion and release of the cover in the second housing inlet can advantageously be carried out without tools. The adapter preferably includes a threaded connector so that the liquid can be sucked in through the adapter. The threaded connector is advantageously formed centrally in the cover, so that it has an opening.

The adapter designed as a cover thus closes the second housing inlet and at the same time creates the fluidic connection to the suction inlet via the threaded connector, so that the liquid can be sucked in through the threaded connector through the cover. The threaded connector is inserted with the cover into the second housing inlet and is advantageously placed on the suction inlet in such a way that the suction inlet is connected exclusively to the second housing inlet or the opening of the adapter cover through the threaded connector. In other words, this means that the liquid can only be sucked in through the threaded connector in the second housing inlet. Embodiments other than the threaded connector for producing a suction-tight connection option for connecting a suction hose or a plug-in connection for the suction hose are also possible.

In the second intake situation, a hose with a buoyancy unit attached to one end and a thread on the other is particularly favorable End provided, which can be connected to the threaded connector. Due to the buoyancy unit on the hose, for example an air-filled ball, for example a balloon, or a styrofoam ball, this end of the hose always rises in the direction of the liquid surface, so that the liquid is sucked in in the area of the surface. This suction situation is also referred to below as floating extraction or suction. Floating extraction is particularly suitable for contaminated liquids, where the contamination normally collects in the deeper areas. The hose can preferably be attached to the threaded connector of the adapter without tools.

According to the invention, the submersible pressure pump has at least one handle on the pump housing, which forms at least one lateral support surface. Two handles are preferably formed opposite one another on the pump housing, so that two opposite lateral bearing surfaces are formed. Furthermore, the handles are preferably designed to be integrated into the casing of the pump housing, in particular into the upper casing part. If the submersible pressure pump is operated in the floating suction situation, the submersible pressure pump is preferably placed on its side and not positioned standing on the ground, since access to the second housing inlet on the bottom of the pump housing for connecting the hose is easier when the submersible pressure pump is lying. The submersible pressure pump, with the hose connected, then lies stably on one side on a support surface formed by a handle. By making the handles or the contact surfaces as flat as possible, the submersible pressure pump is prevented from rolling back and forth and the hose from possibly becoming tangled.

A further advantageous embodiment of the submersible pressure pump provides that the on/off circuit of the liquid pump includes a float switch, the float switch detecting a liquid level sufficient for the operation of the submersible pressure pump based on its buoyancy in the liquid. A means for manually overriding the liquid-level-dependent on/off switch is also advantageously provided.

In one embodiment, the float switch is integrated into the pump housing. In another embodiment, the float switch is designed as an external float switch, which by means of a connecting cable with the Pump housing is connected. An external float switch preferably has a central body shaped approximately as a three-sided prism, with the connecting cable connected to the body at a triangular edge. Furthermore, the bases of the three-sided prism are preferably designed as isosceles triangles. The distance between the bases of the three-sided prism starting from the connection cable connection advantageously increases, so that the buoyancy of the body of the floating switch increases with increasing distance from the connection cable connection. The float switch thus advantageously has an essentially triangular shape both in plan view and in cross section along a plane through the connecting cable. The triangular edge of the float switch, to which the connection cable is attached, is hereinafter referred to as the front; the opposite side than behind. On the one hand the float switch and on the other hand by widening the float switch along two axes, the buoyancy of the float switch is improved. The buoyancy or the righting moment of the float switch is greater in the rear area of the float switch than at the front due to the triangular basic shape and the broadening of the float switch to the rear. This means that the float switch is already erected even when the liquid level is low.

In addition, a ring is preferably formed around the central body of the floating switch, which ensures better gliding ability of the floating switch over a surface and improved buoyancy. As a result of this configuration, the float switch does not get caught as often on unevenness on the ground or in a pump shaft.

In the first intake situation, the float switch can either be integrated into the submersible pressure pump or be designed externally. In the second suction situation, ie in the case of floating removal, the floating switch is advantageously integrated into the submersible pressure pump. The override of the liquid level-dependent on/off switch can advantageously be activated here.

The invention further relates to the use of a submersible pressure pump according to the invention, described above, in a first suction situation, the liquid being sucked in through the large-area first housing inlet and the submersible pressure pump being operated standing in the liquid.

For example, the submersible pressure pump is used in a cistern or a water tank.

The invention further relates to the use of an above-described submersible pressure pump according to the invention in a second suction situation, the liquid being sucked in through the single second housing inlet in the bottom of the pump housing and the submersible pressure pump being operated lying on a subsurface. In order to enable the second intake situation, the adapter described above is inserted into the second housing inlet. A hose with a buoyancy unit is advantageously connected to the adapter and the submersible pressure pump is either in the liquid, for example in a cistern, or the submersible pressure pump is on solid ground in the dry and only the hose is suspended in the liquid. Alternatively, the submersible pressure pump can also be suspended and operated hanging from a rope, for example. The handles are particularly suitable for attaching a rope.

The change between the different uses of the submersible pressure pump with the different suction situations takes place through the different closure of the second housing inlet. In the first suction situation, the second housing inlet is closed, for example by means of a conventional screw cap, so that the liquid is sucked in through the large-area suction strainer. In the second, floating suction situation, the adapter is inserted into the second housing inlet and interrupts the fluidic connection to the suction strainer while the liquid is sucked in through the threaded connector in the adapter and the optionally connected hose.

The invention is described in more detail below on the basis of the preferred exemplary embodiments with the aid of the figures, with only the features necessary for understanding the invention being discussed.

FIG 1:

eine Seitenansicht einer Tauchdruckpumpe in einer ersten Ausführungsform,

FIG 2:

eine obere Perspektivansicht der Tauchdruckpumpe gemäß der Figur 1,

FIG 3:

eine Draufsicht der Tauchdruckpumpe gemäß der Figur 1,

FIG 4:

eine untere Perspektivansicht der Tauchdruckpumpe gemäß der Figur 1,

FIG 5:

eine Unteransicht der Tauchdruckpumpe gemäß der Figur 1,

FIG 6:

eine Querschnittsansicht der Tauchdruckpumpe gemäß der Figur 1,

FIG 7:

eine Seitenansicht eines externen Schwimmschalters,

FIG 8:

eine Seitenansicht einer Tauchdruckpumpe in einer anderen Ausführungsform,

FIG 9:

eine obere Perspektivansicht der Tauchdruckpumpe gemäß der Figur 8,

FIG 10:

eine Draufsicht der Tauchdruckpumpe gemäß der Figur 8,

FIG 11:

eine untere Perspektivansicht der Tauchdruckpumpe gemäß der Figur 8,

FIG 12:

eine Unteransicht der Tauchdruckpumpe gemäß der Figur 8,

FIG 13:

eine Querschnittsansicht der Tauchdruckpumpe gemäß der Figur 8, und

FIG 14:

eine schematische Darstellung der Tauchdruckpumpe gemäß der Figur 8 in der schwimmenden Entnahme.

They show in detail:

1:

a side view of a submersible pressure pump in a first embodiment,

2:

a top perspective view of the submersible pressure pump according to FIG figure 1 ,

3:

a top view of the submersible pressure pump according to FIG figure 1 ,

4:

a bottom perspective view of the submersible pressure pump according to FIG figure 1 ,

5:

a bottom view of the submersible pressure pump according to figure 1 ,

6:

a cross-sectional view of the submersible pressure pump according to FIG figure 1 ,

7:

a side view of an external float switch,

8:

a side view of a submersible pressure pump in another embodiment,

9:

a top perspective view of the submersible pressure pump according to FIG figure 8 ,

10:

a top view of the submersible pressure pump according to FIG figure 8 ,

11:

a bottom perspective view of the submersible pressure pump according to FIG figure 8 ,

12:

a bottom view of the submersible pressure pump according to figure 8 ,

13:

a cross-sectional view of the submersible pressure pump according to FIG figure 8 , and

14:

a schematic representation of the submersible pressure pump according to figure 8 in the floating withdrawal.

In the Figures 1 to 6 a submersible pressure pump 1 is shown in a first embodiment.

The figure 1 12 shows a side view of the submersible pressure pump 1 in the first embodiment. The submersible pressure pump 1 includes a pump housing 2 a substantially cylindrical shape. The pump housing 2 is surrounded by a multi-part covering, an upper covering part 2a, a middle covering part 2b and a lower covering part 2c. Between the middle panel part 2b and the lower panel part 2c there is a strainer 3 with a large suction grille with a large number of openings into the interior of the pump housing 2. The upper panel part 2a also forms two opposite handles 6.

The pump housing 2 has a housing outlet A and two housing inlets E1, E2, through which a liquid can be sucked into the pump housing 2 and pumped out of the pump housing 2 again. The housing outlet A is located at the top of the pump housing 2 and has a threaded connector to which a hose can be attached, for example. The openings of the intake grille of the suction strainer 3 form the first housing inlet E1, which is thus formed over a large area and around the entire circumference of the pump housing 2. The second housing inlet E2 is designed as a single opening in the bottom 8 of the pump housing 2, see FIG Figures 4 to 6 .

Furthermore, the submersible pressure pump 1 in the embodiment shown here comprises an external floating switch 14 which is connected to the pump housing 2 via a connecting cable 15 . The float switch 14 ensures that a liquid pump arranged in the pump housing 2 is switched on/off as a function of the liquid level.

There is also a power cable 5 via which the submersible pressure pump 1 can be supplied with energy. A holder 7 is attached to one of the two handles 6 or to the upper covering part 2a, into which the power cable 5 or the connecting cable 15 of the float switch 14 or the float switch 14 itself can be hung.

The submersible pressure pump 1 can be used and operated in different suction situations. In the first suction situation shown here as an example, there is a fluidic connection I between the suction inlet 4 and the first housing inlet E1, so that the liquid is sucked in through the suction strainer 3. In the second suction situation shown here as an example, there is a fluidic connection II between the suction inlet 4 and the second Housing inlet E2 before, so that the liquid is sucked through the single second housing inlet E2. Depending on the intake situation, the submersible pressure pump 1 is operated in an upright position or lying down.

The figure 2 shows a top perspective view and the figure 3 a top view of the submersible pressure pump 1 according to FIG figure 1 . In the embodiment with an external float switch 14, the submersible pressure pump 1 is primarily operated while standing.

The figure 4 still shows a bottom perspective view and the figure 5 a bottom view of the submersible pressure pump 1 according to figure 1 . The submersible pressure pump 1 shown here is operated in the first suction situation, i.e. the liquid is sucked through the first housing inlet E1, i.e. the openings of the suction strainer 3, through the suction inlet 4 into the liquid pump in the pump housing 2. For this purpose, the second housing inlet E2 in the base 8 is closed. In this embodiment, a simple cover 9 with a bayonet catch is used to close the second housing inlet E2.

In the figure 6 12 is a cross-sectional view of the submersible pressure pump 1 according to FIG figure 1 shown, in which the path of the liquid according to the fluidic connection I in the first suction situation from the suction strainer 3 to the suction inlet 4 is shown in dashed lines with the second housing inlet E2 closed.

The figure 7 shows a side view of an external float switch 14, as in the Figures 1 to 6 is shown. The float switch 14 has a central body 14a shaped as a three-sided prism, the connecting cable 15 being connected to the body 14a at a triangular edge. In order to improve the buoyancy of the float switch 14, the central body 14a widens starting from the connecting cable 15, that is to say it becomes wider. As a result, the body 14a experiences the greatest buoyancy or the greatest righting moment in the outer region, ie opposite the edge of the triangle to which the connecting cable 15 is attached. A ring 14b is formed around the central body 14a of the float switch 14, which provides better gliding ability of the float switch over a surface as well as further improved buoyancy.

In the Figures 8 to 13 the submersible pressure pump 1 is shown in another embodiment. The following is therefore only on the differences received between the two embodiment. Identical components are marked with the same reference symbols.

The figure 8 12 shows a side view of the submersible pressure pump 1 in the other embodiment. The submersible pressure pump 1 according to figure 8 differs from the submersible pressure pump 1 according to the figure 1 is that initially the float switch is not designed as an external float switch, but is integrated into the pump housing 2 and is therefore not visible. Furthermore, the submersible pressure pump 1 differs according to the figure 8 from the submersible pressure pump 1 according to the figure 1 that the strainer 3 and thus the first housing inlet E1 is significantly larger. In the embodiment shown here, the submersible pressure pump 1 is also operated in the second suction situation, ie the liquid is sucked through the second housing inlet E2 through the suction inlet 4 into the liquid pump in the pump housing 2 .

In the second intake situation, the liquid pump 1 is mainly operated while lying down, see FIG figure 13 . The figure 9 shows a top perspective view and the figure 10 a top view of the submersible pressure pump 1 according to FIG figure 8 . The two handles 6 are flattened in the upper area and together with the central covering part 2b form two lateral three-point-type contact surfaces for the submersible pressure pump 1.

To switch from the first intake situation to the second intake situation, the first fluidic connection I must be interrupted and the second fluidic connection II established. For this purpose, the cover 9, which closes the second housing inlet E2, is exchanged for an adapter 10. The exchange of cover 9 and adapter 10 takes place without tools.

The figure 11 still shows a bottom perspective view and the figure 12 a bottom view of the submersible pressure pump 1 according to figure 8 . The adapter 10 is also designed as a type of cover, which in this embodiment is screwed into the second housing inlet E2 by means of a bayonet lock. In addition, the adapter 10 has an open threaded connector 11 which extends to the suction inlet 4 so that on the one hand the second fluidic connection II is created and on the other hand the first fluidic connection I is interrupted. The liquid is then sucked in through the threaded connector 11 of the adapter 10 via the suction inlet 4 .

In the figure 13 12 is a cross-sectional view of the submersible pressure pump 1 according to FIG figure 8 shown, in which the path of the liquid according to the fluidic connection II in the second suction situation through the threaded connector 11 of the adapter 10 to the suction inlet 4 with an interrupted first fluidic connection I is shown in dashed lines.

The figure 14 shows a schematic representation of the submersible pressure pump 1 according to FIG figure 8 , which is operated in the second suction situation while lying down, the so-called floating extraction. The submersible pressure pump 1 lies on one of its lateral bearing surfaces on the bottom of a cistern 20 filled with water. The water surface is indicated as a dashed line. A hose 21 is connected to the housing outlet A, which hose conveys the water out of the cistern 20 . A tube 12 is also connected to the threaded socket of the adapter, at the other end of which a buoyancy unit 13 in the form of an air-filled balloon is attached. The balloon holds the hose 12 up so that the water is always sucked in close to the surface in order to prevent impurities deposited on the bottom from entering the liquid pump.

Overall, the invention therefore proposes a submersible pressure pump for liquid, at least having: a pump housing with a housing outlet, a first housing inlet and a second housing inlet, a liquid pump with an on/off switch, and a suction inlet, wherein in a first suction situation a There is a fluidic connection between the suction inlet and the first housing inlet, while in a second suction situation a fluidic connection is established between the suction inlet and the second housing inlet, with an adapter being provided for changing from the first suction situation to the second suction situation, and with at least one handle on the side is provided at the upper end of the pump housing, which is flattened at the upper end, so that the submersible pressure pump is stable on one side in the second suction situation and the at least one handle prevents the submersible pressure pump from rolling back and forth.

Although the invention has been illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention, which is defined by the following claims leave.

Reference List

1

submersible pressure pump

2

pump housing

2a

upper cowling

2 B

middle panel

2c

lower cowling

3

strainer

4

suction inlet

5

power cord

6

handle

7

bracket

8th

Floor

9

Lid

10

adapter cover

11

threaded socket

12

Hose

13

buoyancy unit

14

float switch

14a

Body

14b

ring

15

connection cable

20

cistern

21

outlet hose

A

housing outlet

E1

first housing inlet

E2

second housing inlet

I

fluidic connection in the first intake situation

II

fluidic connection in the second intake situation

Claims (13)

1. Submersible pressure pump (1) for liquid, at least having:

   1.1. a pump housing (2) with a housing outlet (A), with a first, large-area, housing inlet (E1) in the form of a suction strainer (3), and with a second, individual, housing inlet (E2) formed in the base (8) of the pump housing (2),

   1.2. a liquid pump which is arranged in the pump housing (2) and which has an arrangement for liquid-level-dependent or pressure-controlled on/off-switching, and

   1.3. a suction inlet (4) into the liquid pump, wherein,

   1.4. in a first intake situation, there is a fluidic connection (I) between the suction inlet (4) and the first housing inlet (E1) such that the liquid is sucked in through the large-area first housing inlet (E1), wherein the second housing inlet (E2) is closed off, and,
   in a second intake situation, there is established a fluidic connection (II) between the suction inlet (4) and the second housing inlet (E2) such that the liquid is sucked in through the individual second housing inlet (E2), wherein,

   1.5. for changing from the first intake situation to the second intake situation, provision is made of an adaptor (10) which is configured in such a way that the fluidic connection (I) between the suction inlet (4) and the first housing inlet (E1) is interrupted and, at the same time, the fluidic connection (II) between the suction inlet (4) and the second housing inlet (E2) is established,

   characterized in that
   1.6. provision is made laterally at the upper end of the pump housing (2) of at least one handle (6), which is flattened at the upper end, such that the at least one handle (6) forms, together with a middle cladding part (2b) of the submersible pressure pump (1), a lateral three-point-type bearing surface such that, in the second intake situation, the submersible pressure pump (1) lies on one side in a stable manner and the at least one handle (6) prevents the submersible pressure pump (1) from rolling back and forth.
2. Submersible pressure pump (1) according to preceding Patent Claim 1, characterized in that the adaptor (10) is in the form of a cover which can be inserted into the second, individual, housing inlet (E2).
3. Submersible pressure pump (1) according to either of preceding Patent Claims 1 and 2, characterized in that the adaptor (10) comprises a threaded connection piece (11) such that the liquid can be sucked in through the adaptor (10).
4. Submersible pressure pump (1) according to preceding Patent Claim 3, characterized in that provision is made of a hose (12) with a buoyancy unit (13) fastened to one end and with a thread at the other end, which hose can be connected to the threaded connection piece (11).
5. Submersible pressure pump (1) according to one of preceding Patent Claims 1 to 4, characterized in that the arrangement for on/off-switching of the liquid pump comprises a float switch (14), wherein the float switch (14), on the basis of its buoyancy in the liquid, detects a liquid level which is sufficient for operation of the submersible pressure pump (1).
6. Submersible pressure pump (1) according to one of preceding Patent Claims 1 to 5, characterized in that provision is made of a means for manually overriding the liquid-level-dependent or pressure-controlled on/off-switching.
7. Submersible pressure pump (1) according to either of preceding Patent Claims 5 and 6, characterized in that the float switch (14) is integrated into the pump housing (2).
8. Submersible pressure pump (1) according to either of preceding Patent Claims 5 and 6, characterized in that the float switch is in the form of an external float switch (14) which is connected to the pump housing (2) by means of a connecting cable (15) .
9. Submersible pressure pump (1) according to preceding Patent Claim 8, characterized in that the float switch (14) has a central body (14a) which is shaped approximately in the form of a triangular prism, wherein the connecting cable (15) is connected to the body (14a) at a triangle edge.
10. Submersible pressure pump (1) according to preceding Patent Claim 9, characterized in that, proceeding from the connection of the connecting cable (15), the spacing between the bases of the triangular prism increases, so that the buoyancy of the body (14a) increases with increasing distance from the connection of the connecting cable (15).
11. Submersible pressure pump (1) according to either of preceding Patent Claims 9 and 10, characterized in that a ring (14b) is formed around the central body (14a) of the float switch (14), which ring provides for better capability of sliding of the float switch (14) over an underlying surface and also for improved buoyancy.
12. Use of a submersible pressure pump (1) according to one of preceding Patent Claims 1 to 11 in a first intake situation, wherein the liquid is sucked in through the large-area first housing inlet (E1) and the submersible pressure pump (1) is operated standing in the liquid.
13. Use of a submersible pressure pump (1) according to one of preceding Patent Claims 1 to 11 in a second intake situation, wherein the liquid is sucked in through the individual second housing inlet (E2) in the base (8) of the pump housing (2) and the submersible pressure pump (1) is operated lying on an underlying surface.

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