DE29711534U1 - Submersible pump - Google Patents

Description

Gesthuysen & von Rohr

97.422.2.ru Essen, July 3, 1997

Utility model application

Elektra Beckum AG Daimlerstrasse 1

49716 Meppen

Submersible pump

Gesthuysen & von Rohr - 1 -

The invention relates to a submersible pump with the features of the preamble of claim 1.

The known submersible pump from which the invention is based has a two-part housing, the housing parts of which are made of plastic. The lower part of the housing comprises the base with a filter plate and a suction opening with a non-return valve, the lower part of the pump pressure chamber with a three-stage centrifugal pump located therein, and the lower part of a riser pipe. The upper part of the pump housing accommodates the encapsulated electric drive motor, connections, pressure switch, another section of the pump pressure chamber and on the upper ceiling a pressure nozzle leading off from there, from which a hose then leads to the drain (DE - A - 42 30 306). Other submersible pumps of the type in question are designed in a similar way (DE - A - 44 32 224).

The existing submersible pumps consist of too many components and are too complicated. The manufacturing costs of these pumps are further increased by the fact that they can practically not be designed to meet customer requirements. The tools for all parts, especially the pump housing, would have to be changed if a customer-specific version were to be produced.

The invention is based on the object of specifying a submersible pump that can be manufactured in a flexible and changeable manner.

The previously indicated task is solved in a submersible pump with the features of the preamble of claim 1 by the features of the characterizing part of claim 1. According to the invention, the upper part of the pump housing is designed as a casing housing, while the lower part of the pump housing houses all the components of the submersible pump itself. This means that by changing the casing housing - upper part of the pump housing - the submersible pump can be varied as the respective customer wishes. A carrying handle can be integrated, attached or designed without a carrying handle. The pump housing can be round, square, tapered or shaped in another way. The only important thing is that the upper part of the pump housing is connected to the lower part of the pump housing.

Gesthuysen & von Rohr - 2 -

can be fitted and fits and can, if necessary, encompass the lower part of the pump housing.

For a customized design, all that is required is to change the tools for the upper part of the pump housing, which only incurs minimal costs if the upper part of the pump housing is cleverly designed.

Preferred embodiments and further developments are the subject of subclaims 2 to 6.

However, the known submersible pumps are also in need of improvement in many other areas, and in this respect further problems arise which the teaching of the invention intends to solve.

While in the prior art the drive motor and pump arrangement are usually arranged centrally with respect to the longitudinal axis of the pump housing, according to the invention - claim 7 - an off-center arrangement can be realized with a correspondingly large design of the pump housing. This allows special designs of the pump pressure chamber and the accommodation of connection and control parts off-center.

A particularly preferred joining technique for plastic parts of the pump housing is ultrasonic welding or high-frequency welding. The advantage is that no additional seal is required, but a permanently tight connection is achieved (claim 8).

The design solution of claim 9 is particularly useful in itself, although it can also be implemented in a particularly advantageous manner in conjunction with a submersible pump according to claim 1. According to claim 10, the drive motor is even assembled without an additional B-bearing shield. The corresponding mount is made directly in the upper part. The difficulty with this design is that the drive motor generates considerable heat and this naturally affects the mount. Polyamides are generally used as appropriately temperature-resistant plastics.

Γ>. Cl? A?

Gesthuysen & von Rohr - 3 -

used. However, since polyamides are not suitable for this due to their water absorption, the particularly preferred solution of claim 10 results.

The use of an externally mounted float switch connected by cable is known for submersible pumps. According to claim 11, the float switch is integrated into the pump housing, preferably in its lower part. Particularly interesting embodiments of the "float switch in the pump housing" principle are the subject of claims 12 to 20. These embodiments are explained in detail in connection with the special part of the description.

The special solution for the design of the pump pressure chamber according to claim 21 drastically increases the pump efficiency. With the same pump output, the electrical drive power can therefore be reduced. This will also be explained in more detail in connection with the explanation of the exemplary embodiment. Related subclaims 22 and 23 follow.

A particularly preferred embodiment of the submersible pump according to the invention, which has independent inventive significance, is the subject of claim 25. In order to ensure independent suction, it is generally necessary to remove the initially existing air cushion from the pump pressure chamber. The air is usually discharged via a vent line (bore) in the pump housing that leads to the outside. This has the consequence that when the submersible pump is in operation, water constantly escapes to the outside through this vent line. This avoids the imaginative routing of the pressure port or a pressure line that connects to the pressure port explained in claim 25. The air is thus pressed into the pressure port, and no water escapes to the outside when the submersible pump is in operation, although the pump pressure chamber is vented in the appropriate and desired manner. Subordinate claims 26 and 27 describe preferred embodiments of this teaching.

Preferred embodiments and further developments of the invention are described in more detail below based on the explanation of preferred embodiments with reference to the drawing. The drawing shows

Gesthuysen & von Rohr - 4 -

Fig. 1 is an exploded view of a preferred first embodiment

a submersible pump according to the invention,

Fig. 2 different variants of the upper part of the pump housing of the submersible pump from Fig. 1,

Fig. 3 is a perspective view obliquely from below of a further preferred embodiment of a submersible pump according to the invention,

Fig. 4 a more detailed representation of the upper part of an inventive

Submersible pump together with the elements of the drive motor,

Fig. 5 a modification of the upper part of the submersible pump from Fig. 4 to accommodate a starting capacitor,

Fig. 6 a section through a separating membrane for a float switch

special design,

Fig. 7 is a view, particularly in conjunction with Fig. 3, of a

Insert part showing a float switch in a particularly preferred design,

Fig. 8 shows a perspective view of a spiral-shaped pump pressure chamber of a submersible pump according to the invention for achieving a laminar flow with little pressure loss,

Fig. 9 various examples of possible pump wheels for a submersible pump according to the invention,

Fig. 10 shows a schematic representation, partly in section, of the area of the pump pressure chamber of a particularly preferred embodiment of a submersible pump according to the invention.

Gesthuysen & von Rohr

-5-

Fig. 1 shows the submersible pump according to the invention with a pump housing 3 having a lower part 1 and an upper part 2. The pump housing 3 forms a base 4, to which an additional part 5 in the form of a spacer ring is assigned in the embodiment shown. The additional part 5 can be attached to the lower part 1 and leads to a greater distance between the base 4 and the floor. With the additional part 5 you have a submersible pump with a normal suction distance, without the additional part 5 you have a flat suction cup for water levels of a few millimeters.

Unless otherwise expressly stated, for certain designs of the submersible pump, the lower part 1 or the upper part 2 can also be degenerated to a smooth cover or cover part.

On the pump housing 3 in the base 4, one can see a centrally arranged intake opening 6, to which a pump pressure chamber 7 is connected. A pump wheel 8 can also be seen, which can be driven by an electric drive motor 9 arranged above it. On the electric drive motor 9, one can see an upper capsule part 10 and a lower capsule part 11, which are connected to one another in a watertight manner during assembly, the stator 12 and the rotor 13 with drive shaft 14. A pressure nozzle 15 extends from the pump pressure chamber 7, through which the sucked-in water is discharged. The water enters the pump pressure chamber 7, sucked in by the pump wheel 8 through the intake opening 6, and leaves the pump pressure chamber 7 via the pressure nozzle 15.

The exploded view shows that here the lower part 1 of the pump housing 3 contains the pump pressure chamber 7 and contains or carries the drive motor 9 with the connection and control parts of the usual type, that here the upper part 2 of the pump housing 3 is only designed as a casing and that upper parts 2 of different shapes can be placed on one and the same lower part 1. The latter can be clearly seen in Fig. 2.

It is essential for this teaching that the submersible pump itself is fully functional with the lower part 1 of the pump housing 3, so that the upper part 2 essentially only has a decorative and protective function. It can therefore take on very different forms.

Gesthuysen & von Rohr - 6 -

In the illustrated embodiment, it is provided that the upper part 2 of the pump housing 3 largely encloses the lower part 1 of the pump housing 3.

In the illustrated embodiment, as in the prior art, it is provided that the parts of the pump housing 3 are made of plastic.

The parts of the pump housings of previously known submersible pumps are regularly connected with screw connections. This can also be done with the pump housing 3 of the submersible pump according to the invention. However, particularly when the parts of the pump housing 3 are made of plastic, a different connection technique is recommended, which is cost-effective and absolutely leak-proof and makes the use of additional sealants superfluous. For this purpose, it is necessary to provide that the upper part 2 and the lower part 1 of the pump housing 3 are connected to one another by means of ultrasonic welding or high-frequency welding. In the exemplary embodiment shown, Fig. 1, the protruding flanges on the lower part 1 and upper part 2, where the welding is carried out, can be seen. The advantages of directly welding the plastic parts have already been discussed above. No additional seal is required and the problem of leaks can no longer occur if the welding is carried out correctly.

The illustrated embodiment further shows that a carrying handle 16 is integrated into the upper part 2.

Furthermore, the embodiment in the exploded view of Fig. 1 shows that the pressure nozzle 15 protrudes axially from the pump pressure chamber 7 at a radially outer position and that a passage 17 for the pressure nozzle 15 is provided in the upper part 2.

In principle, the above-mentioned teaching provides that the upper part 2 is only designed as a casing. Now the previously explained variant shows that a small functionality can also be assigned to the upper part 2, which hardly increases the manufacturing costs in terms of tooling. A further functionality can be assigned to the upper part 2 by the drive motor 9 or the

Gesthuysen & von Rohr - 7 -

The capsule housing 10/11 engages at the end remote from the base 4 in a receptacle 2a formed on the upper part 2. The receptacle 2a, which cannot be seen in Fig. 1 due to the illustration, stabilizes the drive motor 9 with regard to axial and radial movements, and the submersible pump as a whole operates with less vibration.

Fig. 3 and Fig. 4 show a further developed embodiment, which is of particular importance in itself. This means that the receptacle 2a in the upper part 2 replaces a B-bearing shield of the drive motor 9. In Fig. 4, one can again see the stator 12 and the rotor 13 of the drive motor 9. Without an additional B-bearing shield, the stator 12 is mounted directly in the receptacle of the upper part 2. This means that a temperature-resistant and water-resistant plastic must be used for the upper part 2, and for the reasons stated above, this will probably not be polyamide, but another, water-resistant plastic, in particular a glass-fiber-reinforced polypropylene. This achieves the temperature resistance of polyamide combined with the moisture resistance that is required.

Fig. 3 also shows that the drive motor 9 and the pump arrangement 6, 7, 8 are not arranged centrally but eccentrically with respect to the longitudinal axis (the vertical) of the pump housing 3, so that a corresponding arrangement of the remaining parts in the pump housing 3 results.

Fig. 3 also indicates, Fig. 5 shows in more detail, that in the illustrated embodiment a starting capacitor 9a is also provided for the drive motor 9. This starting capacitor 9a is relatively large. In the illustrated embodiment, it is conveniently housed in its own receptacle 2b on the upper part 2 of the pump housing 3, which is itself located above the receptacle 2a forming the B bearing shield.

In order to achieve a large immersion depth for the submersible pump, for example a submersion depth of up to 100 m, an extremely pressure-tight radial shaft seal can be used instead of an otherwise familiar mechanical seal.

Gesthuysen & von Rohr - 8 -

The embodiment shown in Fig. 1 further shows that the drive motor 9 is switched via a float switch 18 integrated in the lower part 1 of the pump housing 3. The exploded view shows the float 18a, a separating membrane 18b and the actual microswitch 18c, which are all arranged in a receptacle 18d on the lower part 1 of the pump housing 3.

An alternative design of the float switch 18 is characterized in that the float switch 18 comprises the essentially vertically aligned receptacle 18d on the pump housing 3, preferably on its lower part 1, the separating membrane 18b closing the upper end of the receptacle 18d and the microswitch 18c located behind the separating membrane 18b in a water-protected manner, whereby the separating membrane 18b has a design that ensures a sufficient stroke in the area of the microswitch 18c, in particular a stroke of several millimeters, without a float, only under the pressure of the rising water or an air bubble compressed by it. Fig. 6 shows such a separating membrane 18b in section. This is characterized in that it has a thin movement point or movement bead 18e on the edge or all around. This is one possibility to achieve the required sufficient deflection of the middle area of the separating membrane 18b. There are certainly other possibilities.

Known from the state of the art are magnetic field-dependent switches 18c, which can be arranged in a water-protected manner outside the holder 18d in a float 18a equipped with a permanent magnet. Reed contacts, Hall sensors, magnetoresistive sensors or the like can be used as such. Ultimately, this depends on the evaluation, the desired accuracy and the permissible cost of production (evaluation logic).

Fig. 7 shows in conjunction with Fig. 3 a particularly preferred embodiment for a float switch 18. It is provided that the float switch 18 comprises the float 18a, which is now pivotably mounted on an axis 18g via a float lever 18f, which is bent here to follow the outer contour of the pump housing 3. A permanent magnet is arranged or integrated on the float lever 18f near the axis 18g, preferably on another short support arm 18h.

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Gesthuysen & von Rohr

-9-

Adjacent to the permanent magnet, but separated from it in a water-proof manner, a switch 18c that switches depending on the magnetic field is arranged in the pump housing 3. The float 18a and the float lever 18f are made of plastic. Fig. 7 shows the variant with a microswitch 18c that switches depending on the magnetic field by the ferromagnetic actuating part 18j being pulled or pushed by the approaching permanent magnet on the support arm 18h. This is a question of design. The arrangement is extremely cost-effective to implement and also represents a variant of the float switch 18 that can be sealed very well. Furthermore, the other considerations regarding options for the switch 18c that switches depending on the magnetic field also apply here.

Submersible pumps are often designed as dirty water pumps, which requires a corresponding design of the pump wheel 8 and the pump pressure chamber 7. Studies have shown that the vast majority of all submersible pumps are used in practice for clean water. Consequently, the pump pressure chamber 7 can be designed in the same way as for clean water pumps. This design of the pump pressure chamber 7 is not suitable for heavy soiling, but it is also completely unproblematic for almost all applications of submersible pumps in the hobby sector.

In all known submersible pumps of classic design, the hydraulic pump performance is achieved by means of eddy current impellers and correspondingly designed housings, usually with a cylindrical annular space. The pump performance is determined on the one hand by the distance of the pump wheel 8 from the base 4 and on the other hand by the height of the blades of the pump wheel 8. These pump wheels 8 generate eddies and turbulence, the flow is not laminar. The efficiency is therefore not particularly high. This means that a classic submersible pump has a high electrical connection power. According to the invention, however, the pump technology known from centrifugal pumps is now transferred to the submersible pump according to the invention. A pump wheel 8 of a centrifugal pump designed according to the knowledge of the experts is used in order to keep the power losses as low as possible. So that the kinetic energy of the flowing liquid emerging from the pump wheel 8 is affected as little as possible, a spiral-shaped pump pressure chamber 7 is arranged downstream of the pump wheel 8. This is shown in Fig. 8. This technology

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Gesthuysen & von Rohr

- 10-

the overall efficiency of the submersible pump can be increased considerably. With the same pump output, the drive power of the drive motor 9 can be reduced considerably, and the drive motor 9 can be selected more cost-effectively.

Fig. 9 shows that according to this teaching, the pump wheel 8 is designed as a radial impeller to achieve a high, uniform radial acceleration and, preferably, has a plate 8a that is closed at the top and curved blades 8b arranged on the plate 8a. Three variants of pump wheels 8 are shown here. A certain application-related use of the submersible pump can be achieved by choosing the pump wheel 8. The pumping characteristics of the submersible pump can be changed by choosing the pump wheel 8. The example shown shows the interchangeability of the pump wheels 8. A pump wheel with a cover has a high delivery capacity primarily for clean water, a pump wheel without a cover has a lower delivery capacity because the gaps are larger, but can also pump contaminated water to a limited extent.

The function of the additional part 5 on the base 4 of the submersible pump has already been explained at the beginning. This additional part 5 allows the base 4 to be changed from a small distance from the ground to a larger distance from the ground. The additional part 5 can be attached as shown here or the additional part 5 can be attached to the pump housing 3 in an adjustable manner so that the distance can be changed as required.

The illustrated embodiment also shows that the upper part 2 of the pump housing 3 is made in one piece, but that the lower part 1 of the pump housing 3 itself consists of several parts that are put together. The latter serves to simplify the manufacturing process in terms of shape.

The maximum pressure that can be achieved on the pressure side can be around 1 bar, so that a delivery head of up to 10 m can be achieved. At 0.5 to 1.0 m, several cubic meters per hour can be delivered over a diameter of 1 inch.

Finally, Fig. 10 shows an independent and particularly interesting teaching. In the general part of the description it has already been explained that an independent

Gesthuysen & von Rohr - 11 -

Suction in submersible pumps requires venting of the pump pressure chamber 7. This is also provided in this embodiment, but in an interesting design that prevents water from constantly leaking out of the vent line during operation. For this purpose, it is provided that the pressure connection 15 runs upwards through the pump pressure chamber 7 and that the vent line is designed as a passage opening 15a in the pressure connection 15 in the pump pressure chamber 7, preferably at the upper edge of the pump pressure chamber 7.

In the embodiment shown in Fig. 10, several passage openings 15a can be seen. These can be provided with non-return valves or other non-return elements, although this cannot be seen in Fig. 10.

Claims (27)

Gesthuysen & von Rohr - 12 - Protection claims: 1. Submersible pump with a pump housing (3) having a lower part (1) and an upper part (2) with a base (4) with a suction opening (6) located therein, preferably arranged centrally, with a pump pressure chamber (7), with a pump wheel (8) and with an electric drive motor (9) driving the pump wheel (8), arranged above the pump wheel (8) and provided with connection and control parts, wherein a pressure port (15) extends from the pump pressure chamber (7) and whereby the water enters the pump pressure chamber (7) through the suction opening (6) and leaves the pump pressure chamber (7) again via the pressure port (15), characterized, that the lower part (1) of the pump housing (3) contains the pump pressure chamber (7) and contains or carries the drive motor (9) with the connection and control parts, that the upper part (2) of the pump housing (3) is only designed as a casing housing and that upper parts (2) of different shapes can be placed on one and the same lower part (1). 2. Submersible pump according to claim 1, characterized in that the upper part (2) of the pump housing (3) largely encloses the lower part (1) of the pump housing (3). 3. Submersible pump according to claim 1 or 2, characterized in that the parts (1, 2) of the pump housing (3) consist of plastic. 4. Submersible pump according to one of claims 1 to 3, characterized in that the lower part (1) of the pump housing (3) and/or the upper part (2) of the pump housing (3) itself consists of several parts. 5. Submersible pump according to one of claims 1 to 4, characterized in that a carrying handle (16) is integrated into the upper part (2). 17·1 \i ·:;:· Gesthuysen & von Rohr - 13 - 6. Submersible pump according to one of claims 1 to 5, characterized in that the pressure nozzle (15) protrudes axially from the pump pressure chamber (7) at a radially outer position and that a passage (17) for the pressure nozzle (15) is provided in the upper part (2). 7. Submersible pump with a pump housing (3) having a lower part (1) and an upper part (2) with a base (4) with a suction opening (6) located therein, preferably arranged centrally, with a pump pressure chamber (7), with a pump wheel (8) and with an electric drive motor (9) driving the pump wheel (8), arranged above the pump wheel (8) and provided with connection and control parts, wherein a pressure port (15) extends from the pump pressure chamber (7) and whereby the water enters the pump pressure chamber (7) through the suction opening (6) and leaves the pump pressure chamber (7) again via the pressure port (15), in particular with the features of the characterising part of one of claims 1 to 6, characterized, that the drive motor (9) and preferably also the pump arrangement (6, 7, 8) is or are arranged off-center with respect to the longitudinal axis (vertical) of the pump housing (3). 8. Submersible pump with a pump housing (3) having a lower part (1) and an upper part (2) with a base (4) with a suction opening (6) located therein, preferably arranged centrally, with a pump pressure chamber (7), with a pump wheel (8) and with an electric drive motor (9) driving the pump wheel (8), arranged above the pump wheel (8) and provided with connection and control parts, wherein a pressure port (15) extends from the pump pressure chamber (7) and whereby the water enters the pump pressure chamber (7) through the suction opening (6) and leaves the pump pressure chamber (7) again via the pressure port (15), Gesthuysen & von Rohr - 14 - in particular with the features of the characterising part of one of claims 1 to 7, characterized, that the upper part (2) and the lower part (1) of the pump housing (3) are connected to one another by means of ultrasonic welding or high-frequency welding. 9. Submersible pump with a pump housing (3) having a lower part (1) and an upper part (2) with a base (4) with a suction opening (6) located therein, preferably arranged centrally, with a pump pressure chamber (7), with a pump wheel (8) and with an electric drive motor (9) driving the pump wheel (8), arranged above the pump wheel (8) and provided with connection and control parts, wherein a pressure port (15) extends from the pump pressure chamber (7) and whereby the water enters the pump pressure chamber (7) through the suction opening (6) and leaves the pump pressure chamber (7) again via the pressure nozzle (15), in particular with the features of the characterising part of one of claims 1 to 8, characterized, that the drive motor (9) or its capsule housing (10/11) engages at the end remote from the base (4) in a receptacle (2a) formed on the upper part (2) and that, preferably, a separate receptacle (2b) is provided on the upper part (2) of the pump housing (3) for a starting capacitor (9a). 10. Submersible pump according to claim 9, characterized in that the receptacle (2a) on the upper part (2) of the pump housing replaces a B-bearing shield of the drive motor (9) and that the material of the upper part (2) of the pump housing, at least in the area of the receptacle, is a temperature-resistant and water-resistant plastic, in particular a glass fiber-reinforced polypropylene. Gesthuysen & von Rohr - ; - 15- 11. Submersible pump with a pump housing (3) having a lower part (1) and an upper part (2) with a base (4) with a suction opening (6) located therein, preferably arranged centrally, with a pump pressure chamber (7), with a pump wheel (8) and with an electric drive motor (9) driving the pump wheel (8), arranged above the pump wheel (8) and provided with connection and control parts, wherein a pressure port (15) extends from the pump pressure chamber (7) and whereby the water enters the pump pressure chamber (7) through the suction opening (6) and leaves the pump pressure chamber (7) again via the pressure port (15), in particular with the features of the characterising part of one of claims 1 to 10, characterized, that the drive motor (9) is switched via a float switch (18), preferably integrated in the lower part (1) of the pump housing (3). 12. Submersible pump according to claim 11, characterized in that the float switch (18) comprises a substantially vertically aligned receptacle (18d) on the pump housing (3), preferably on its lower part (1), a float (18a) movable in the receptacle (18d), a separating membrane (18b) closing the upper end of the receptacle (18d) and a microswitch (18c) arranged behind the separating membrane (18b) in a water-protected manner. 13. Submersible pump according to claim 11, characterized in that the float switch (18) comprises a substantially vertically aligned receptacle (18d) on the pump housing (3), preferably on its lower part (1), a separating membrane (18b) closing the upper end of the receptacle (18d) and a microswitch (18c) arranged behind the separating membrane (18b) in a water-protected manner and that the separating membrane (18b) has a design which ensures a sufficient stroke in the area of the microswitch (18c), in particular a stroke of several millimeters, without a float under hydraulic pressure. Gesthuysen & von Rohr "'-&Iacgr;6 - 14. Submersible pump according to claim 13, characterized in that the separating membrane (18b) has a movement thin spot or movement bead (18e) on the edge or all around. 15. Submersible pump according to claim 11, characterized in that the float switch (18) comprises a substantially vertically aligned receptacle (18d) on the pump housing (3), preferably on its lower part (1), a float (18a) movable in the receptacle (18d) and equipped with a permanent magnet, and a switch (18c) arranged outside the receptacle (18d) in a water-protected manner and switching in response to a magnetic field. 16. Submersible pump according to claim 11, characterized in that the float switch (18) comprises a float (18a) which is pivotably mounted on an axis (18g) via a float lever (18f) which is preferably bent to follow the outer contour of the pump housing (3), that a permanent magnet is arranged or integrated on the float lever (18f) near the axis (18g), preferably on a further short support arm (18h), that a magnetic field-dependent switching switch (18c) is arranged in the pump housing (3) adjacent to the permanent magnet, but separated from it in a water-protected manner. 17. Submersible pump according to claim 16, characterized in that the float (18a) and the float lever (18f) are made of plastic. 18. Submersible pump according to one of claims 15 to 17, characterized in that the magnetic field-dependent switch (18c) has a reed contact, a Hall sensor or a magnetoresistive sensor. 19. Submersible pump according to claim 11, characterized in that the float switch (18) comprises two rod electrodes which are arranged in the pump housing (3), namely one rod electrode at or up to the level of the minimum water level, the other rod electrode at or up to the level of the minimum water level or lower, in particular up to the level of the base (4). Gesthuysen & von Rohr - 17 - 20. Submersible pump according to claim 19, characterized in that only a harmless low voltage is present at the rod electrodes. 21. Submersible pump with a pump housing (3) having a lower part (1) and an upper part (2) with a base (4) with a suction opening (6) located therein, preferably arranged centrally, with a pump pressure chamber (7), with a pump wheel (8) and with an electric drive motor (9) driving the pump wheel (8), arranged above the pump wheel (8) and provided with connection and control parts, wherein a pressure port (15) extends from the pump pressure chamber (7) and whereby the water enters the pump pressure chamber (7) through the suction opening (6) and leaves the pump pressure chamber (7) again via the pressure port (15), in particular with the features of the characterising part of one of claims 1 to 20, characterized, that the pump pressure chamber (7) is spiral-shaped, in particular as in pure water pumps. 22. Submersible pump according to claim 21, characterized in that the pump wheel (8) is designed as a radial impeller to achieve a high, uniform radial acceleration and, preferably, has a plate (8a) closed at the top and curved blades (8b) arranged on the plate (8a). 23. Submersible pump according to one of claims 21 or 22, characterized in that the pump wheel (8) is designed for the application, the pumping characteristics of the submersible pump can therefore be changed by selecting the pump wheel (8). 24. Submersible pump according to one of claims 1 to 23, characterized in that an additional part (5) is attachable or adjustably attached to the lower part (1), with which the base (4) can be changed from a small distance from the ground to a larger distance from the ground. Gesthuysen & von Rohr - 18 - 25. Submersible pump with a pump housing (3) having a lower part (1) and an upper part (2) with a base (4) with a suction opening (6) located therein, preferably arranged centrally, with a pump pressure chamber (7), with a pump wheel (8) and with an electric drive motor (9) driving the pump wheel (8), arranged above the pump wheel (8) and provided with connection and control parts, wherein a pressure port (15) extends from the pump pressure chamber (7) and whereby the water enters the pump pressure chamber (7) through the suction opening (6) and leaves the pump pressure chamber (7) again via the pressure port (15), in particular with the features of the characterising part of one of claims 1 to 24, characterized, that the pump pressure chamber (7) is vented via a vent line, that the pressure port (15) runs upwards through the pump pressure chamber (7) and that the vent line is designed as a passage opening (15a) in the pressure nozzle (15) in the pump pressure chamber (7), preferably at the upper edge of the pump pressure chamber (7). 26. Submersible pump according to claim 25, characterized in that several passage openings (15a) are arranged in the pressure nozzle (15). 27. Submersible pump according to claim 25 or 26, characterized in that the passage opening (15a) is provided with a non-return valve or the like.