Method for producing a submersible motor pump

Abstract

A method for producing a submersible motor pump for pumping waste water and/or sewage includes a cylindrical pot-shaped housing forming an inner space between an open base surface and a cover surface axially opposite the base surface, including a connector opening provided in the pot-shaped housing, a motor provided in the inner space and comprising a cylinder-like stator comprising a plurality of windings and a first connector connected to ends of the windings, in particular oriented towards the cover surface and provided with at least one radially resilient latching tab, including the steps of gripping the first connector from outside the pot-shaped housing through the connector opening, inserting the first connector from the inner space into the connector opening, and latching the at least one latching tab to the pot-shaped housing.

Claims

1-15. (canceled)

16. Method for producing a submersible motor pump, comprising: a cylindrical pot-shaped housing forming an inner space between an open base surface and a cover surface axially opposite the base surface, and comprising a connector opening provided in the pot-shaped housing, a motor provided in the inner space and comprising a cylinder-like stator comprising a plurality of windings and a first connector connected to ends of the windings and provided with at least one radially resilient latching tab, and comprising the steps: gripping the first connector from outside the pot-shaped housing through the connector opening; inserting the first connector from the inner space into the connector opening; and latching the at least one latching tab to the pot-shaped housing.

17. Method according to claim 16, wherein the first connector comprises a radially fixed gripping tab, so that by gripping the gripping tab and the latching tab, the at least one latching tab can be radially compressed for inserting the first connector into the connector opening.

18. Method according to claim 16, comprising a holding device for the first connector, which holding device is arranged in the inner space and is associated with the connector opening, wherein the first connector is arranged in the holding device for gripping the first connector.

19. Method according to claim 16, wherein the first connector has a non-rotationally symmetrical cross-section and the connector opening has a cross-section corresponding to the first connector or a non-corresponding cross-section, so that the first connector is secured against rotation or not in the connector opening.

20. Method according to claim 16, wherein the connector opening is provided in the cover surface or in an outer surface of the pot-shaped housing.

21. Method according to claim 16, comprising a second connector connectable to the first connector and comprising a metal sleeve and a second plug contact body made of plastic holding a plurality of second plug contacts, wherein the second plug contact body comprises a radially outwardly extending latching lug made of plastic and the metal sleeve comprises a corresponding radially outwardly extending latching recess and a radially inwardly extending latching lug made of metal such that when the second plug contact body is inserted into the metal sleeve the latching lug made of metal first presses the latching lug made of plastic radially inwards and, after latching of the latching lug made of plastic with the latching recess latches into the second plug contact body.

22. Method according to claim 16, wherein the pot-shaped housing comprises a cover and the connector opening is provided in the cover.

23. Method according to claim 16, comprising an impeller driven by the motor and provided at the base face.

24. Method according to claim 16, comprising the step: gripping the first connector by means of a tool.

25. Submersible motor pump, comprising: a cylindrical pot-shaped housing forming an inner space between an open base surface and a cover surface axially opposite the base surface, comprising a connector opening provided in the pot-shaped housing; and a motor provided in the inner space and comprising a cylinder-like stator comprising a plurality of windings and a first connector connected to ends of the windings and provided with at least one latching tab, wherein the first connector is insertable from outside the pot-shaped housing through the connector opening from the inner space into the connector opening for latching the at least one latching tab to the pot-shaped housing.

26. Submersible motor pump according to claim 25, wherein the first connector comprises a radially fixed gripping tab, so that by gripping the gripping tab and the latching tab, the at least one latching tab can be radially compressed for inserting the first connector into the connector opening.

27. Submersible motor pump according to claim 25, comprising a holding device for the first connector, which holding device is arranged in the inner space and is associated with the connector opening, wherein the first connector is arranged in the holding device for gripping the first connector.

28. Submersible motor pump according to claim 25, wherein the first connector has a non-rotationally symmetrical cross-section and the connector opening has a cross-section corresponding to the first connector or a non-corresponding cross-section, so that the first connector is secured against rotation or not in the connector opening.

29. Submersible motor pump according to claim 25, wherein the connector opening is provided in the cover surface or in an outer surface of the pot-shaped housing.

30. Submersible motor pump according to claim 25, comprising a second connector connectable to the first connector and comprising a metal sleeve and a second plug contact body made of plastic holding a plurality of second plug contacts, wherein the second plug contact body comprises a radially outwardly extending latching lug made of plastic and the metal sleeve comprises a corresponding radially outwardly extending latching recess and a radially inwardly extending latching lug made of metal such that when the second plug contact body is inserted into the metal sleeve the latching lug made of metal first presses the latching lug made of plastic radially inwards and, after latching of the latching lug made of plastic with the latching recess latches into the second plug contact body.

31. Submersible motor pump according to claim 25, comprising a second connector connectable to the first connector and comprising a second plug contact body holding a plurality of second plug contacts and forming a second connector face, wherein the second connector comprises on the connector face side a filling opening for potting the plurality of second plug contacts in the second plug contact body with potting material and an overflow volume, which is offset axially with respect to the filling opening, for collecting excess potting material emerging from the filling opening.

33. Submersible motor pump according to claim 25, comprising a second connector connectable to the first connector and comprising a second plug contact body holding a plurality of second plug contacts, a second plug contact housing into which the second plug contact body is inserted, and an integrally formed sealing ring radially surrounding the second plug contact housing, wherein a first part of the sealing ring is arranged radially between the second plug contact body and the second plug contact housing and the second part rests axially on the second plug contact housing for sealing with respect to at least one of the pot-shaped housing and the first connector.

34. Submersible motor pump according to claim 25, wherein at least one of the first connector comprises ten axially symmetrically arranged first plug contacts and the second connector comprises a strain relief, which can be fixed by means of cable ties and/or binding wire, for a cable of the second connector.

35. Submersible motor pump according to claim 25, wherein the pot-shaped housing is formed from sheet metal.

36. Sewage lifting unit comprising a submersible motor pump according to claim 25.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In the following, the invention is explained in more detail with reference to the accompanying drawings based on preferred exemplary embodiments.

[0037] In the drawings:

[0038] FIG. 1 is a schematic perspective view of a submersible motor pump comprising a pot-shaped housing according to a preferred exemplary embodiment of the invention;

[0039] FIG. 2 is a schematic perspective view of a cover surface of the pot-shaped housing comprising a first connector latched thereto according to the preferred exemplary embodiment of the invention;

[0040] FIG. 3 is a schematic perspective view of the first connector comprising a stator of the submersible motor pump according to the preferred exemplary embodiment of the invention;

[0041] FIG. 4 is a sectional view through the pot-shaped housing comprising the first connector and a second connector connected thereto according to the preferred exemplary embodiment of the invention;

[0042] FIG. 5 is a schematic perspective view of the second connector according to the preferred exemplary embodiment of the invention;

[0043] FIG. 6 is a sectional view through the second connector according to the preferred exemplary embodiment of the invention;

[0044] FIG. 7 is a schematic perspective view of the first connector according to the preferred exemplary embodiment of the invention;

[0045] FIG. 8 is a schematic perspective view of the second connector according to the preferred exemplary embodiment of the invention;

[0046] FIG. 9 is a schematic perspective view of a second plug contact housing of the second connector according to the preferred exemplary embodiment of the invention;

[0047] FIG. 10 is a schematic perspective view of a sealing ring of the second connector;

[0048] FIG. 11 is a schematic partial sectional view of the submersible motor pump comprising the pot-shaped housing according to another preferred exemplary embodiment of the invention; and

[0049] FIG. 12 is a schematic partial sectional view of a part of the second connector of the submersible motor pump of FIG. 11 according to the further preferred exemplary embodiment of the invention.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

[0050] FIG. 1 shows a schematic perspective view of a submersible motor pump 1 comprising a pot-shaped housing 2 according to a preferred exemplary embodiment of the invention. The submersible motor pump 1 is configured as a submersible waste water and/or sewage pump and can be used for pumping off contaminated water, for example, from floodwater, in flooded excavation pits, in wash houses, in muddy pits, in biotopes and/or garden ponds, from soakaways and in cellars, and in particular for pumping water with various degrees of contamination, such as stones, mud, rubble or faeces.

[0051] The cylindrical pot-shaped housing 2 made of sheet metal comprises an open base surface, which is adjoined by a pump housing 3 comprising an impeller provided therein, which is not shown in the figure, for pumping the waste water and/or sewage. A cover surface 4 axially opposite the base surface, which can be seen in more detail in FIG. 2, is closed except for a connector opening 5 provided therein. In this way, an inner space 6, indicated in FIG. 4, is formed between the base surface, the cover surface 4 and an outer surface of the pot-shaped housing 2.

[0052] In the inner space 6 of the pot-shaped housing 2, a motor comprising a rotor not shown in more detail is provided for driving the impeller. The motor comprises a cylinder-like stator 7 shown in FIG. 3 and comprising a plurality of windings 8. Ends of the windings 8 designed as strands are led out of the stator 7 at a cover surface of the stator 7 and connected to a first connector 9 shown in more detail in FIG. 7. The stator 7 is arranged in the inner space 6 of the pot-shaped housing 2 in such a way that the cover surface of the stator 7 with the first connector 9 connected to the ends of the windings 8 is oriented towards the closed cover surface 4 of the pot-shaped housing 2, as can be seen in principle from FIG. 4.

[0053] The first connector 9 shown in more detail in FIG. 7, as mentioned, is designed as a male plug with ten first plug contacts 10, which held arranged axially symmetrically in a first plug contact body made of plastic form a first connector face of the first connector 9. The first plug contacts 10 are used for the three phases L1, L2 and L3, for ground, for two winding protection contacts, for a switchgear protection contact and for corner points U1, V1 and W1 of a delta connection for the motor. The first connector 9 also comprises a radially resilient latching tab 11, which extends axially away from the first connector 9 at one edge thereof, parallel to the axis of the first connector contacts 10.

[0054] If the stator 7 is now provided in the inner space 6, for example after the pot-shaped housing 2 has been placed on the stator 7 or after the stator 7 has been inserted into the inner space 6, the first connector 9 is appropriately first inserted into a holding device 12 associated with the connector opening 5. The holding device 12 is designed as a tray and is provided axially below the connector opening 5. In this way, the first connector 9 can be gripped in the holding device 12 from outside the pot-shaped housing 2 through the connector opening 5 by use of a tool, for example a pair of needle-nose pliers, and inserted axially outwards into the connector opening 5. Since the connector opening 5 corresponds in its non-corresponding inner diameter to the non-corresponding outer diameter of the first connector 9, the latching tab 11 thus engages with the pot-shaped housing 2, as shown in FIG. 2. In this way, the first connector 9 is connected to the pot-shaped housing 2 in a force- and form-fitting manner.

[0055] As can be seen in detail from FIG. 7, the latching tab 11 comprises a radially opening latching tab opening 13. Axis-parallel to the latching tab 11, a gripping tab 14 comprising a radially opening gripping tab opening 15 provided thereon extends away from the first plug contact body. For gripping the latching tab 11 and the gripping tab 14, the needle-pointed pliers are appropriately inserted with their tips into the latching tab opening 13 and the gripping tab opening 15, so that the latching tab 11 can be radially compressed for inserting the first connector 9 into the connector opening 5. In addition to the latching tab 11, the first connector 9 comprises two further latching tabs 16 which likewise extend at the edge of the first connector 9 parallel to the axis thereof away therefrom, wherein the latching tab 11 and the two further latching tabs 16 are arranged at approximately regular intervals around the first connector face.

[0056] After latching the first connector 9 to the pot-shaped housing 2, a second connector 17 can be plugged onto the first connector 9 as shown in FIG. 4. The second connector 17 is formed as a female plug and, corresponding to the first connector 9 and as shown in FIG. 8, comprises a second plug contact body 19 made of plastic which holds a plurality of second plug contacts 18 and forms a second connector face. On the connector face side, a radially extending filling opening 20 is provided, into which resin can be filled as a potting material for potting the second plug contacts 18 with strands of a cable connected thereto in the second plug contact body 19. Axially offset from the filling opening 20, i.e. away from the first connector 9, a radially opening and axially extending overflow volume 21 is provided in which excess potting material can be collected.

[0057] FIG. 9 shows a second plug contact housing 22 made of plastic, into which the second plug contact body 17 is inserted on one side and into which the cable is inserted on an opposite side. A sealing ring 23 is provided between the second plug contact housing 22 and the second connector 17, as shown in detail in FIG. 10. A first part of the sealing ring 23 abuts radially between the second plug contact body 19 and the second plug contact housing 22, as shown in FIGS. 4 and 6. A second part of the sealing ring 23 rests axially on the second plug contact housing 22, as shown in FIG. 5. In the connected state of the first connector 9 with the second connector, as shown in FIG. 4, the second part of the sealing ring 23 seals the plug contact housing 22 with respect to the pot-shaped housing 2.

[0058] The second plug contact housing 22 comprises a strain relief 24 for the cable of the first connector on the cable side facing away from the second connector face. The strain relief 24 is formed as a molded plastic part to which the cable is fixed in place by means of a cable tie.

[0059] FIG. 11 shows a schematic partial sectional view of the submersible motor pump 1 comprising the pot-shaped housing 2 according to a further preferred exemplary embodiment of the invention, wherein the pot-shaped housing 2 is configured from gray cast iron. In contrast to the previously described exemplary embodiment, the connector opening 5 is arranged in the outer surface of the pot-shaped housing 2 and pivoted with respect to the axis of the pot-shaped housing 2.

[0060] While FIG. 11 shows the first connector 9 with the second connector 17, FIG. 2 shows a part of the second connector 17 in a sectional view. The second connector 17 comprises a metal sleeve 25 extending axially away from the second connector face in an extension of the second plug contact body 19.

[0061] The second plug contact body 19 comprises a radially outwardly extending latching lug 26 made of plastic. The metal sleeve 25 comprises a corresponding radially outwardly extending latching recess 27 and a radially inwardly extending latching lug 28 made of metal, which is spaced axially from the latching recess 27. In this way, when the second plug contact body 19 is inserted axially into the metal sleeve 25, the latching lug 28 made of metal first presses the latching lug 26 made of plastic radially inwardly, wherein the second plug contact body 19 latches into the second plug contact body 19 after the latching lug 26 made of plastic has latched into the latching recess 27.

[0062] The described exemplary embodiments are merely examples, which may be modified and/or supplemented in a variety of ways within the scope of the claims. Any feature that has been described for a particular exemplary embodiment may be used independently or in combination with other features in any other exemplary embodiment. Any feature that has been described for an exemplary embodiment of a particular category may also be used in a corresponding manner in an exemplary embodiment of another category.

LIST OF REFERENCE SYMBOLS

[0063] 1 submersible motor pump [0064] 2 pot-shaped housing [0065] 3 pump housing [0066] 4 cover surface [0067] 5 connector opening [0068] 6 inner space [0069] 7 stator [0070] 8 windings, especially stranded wires [0071] 9 first connector [0072] 10 first plug contacts [0073] 11 latching lug [0074] 12 holding device [0075] 13 latching tab opening [0076] 14 gripping tab [0077] 15 gripping tab opening [0078] 16 additional latching tab [0079] 17 second connector [0080] 18 second plug contacts [0081] 19 second plug contact body [0082] 20 filling opening [0083] 21 overflow volume [0084] 22 second plug contact housing [0085] 23 sealing ring [0086] 24 strain relief [0087] 25 metal sleeve [0088] 26 latching lug made of plastic [0089] 27 latching recess [0090] 28 latching lug made of metal