Immersion pump and method for assembling an immersion pump

Abstract

An immersion pump is provided, the pump having an integral housing with an inlet opening on an intake side, an outlet opening on a delivery side, a passage for electrical lines, an electronic unit for processing power and optionally information signals, an electric motor, a pressure chamber and a pump unit. The electronic unit, the electric motor, the pressure chamber and the pump unit may be pre-assembled to an insert, with the pre-assembled insert being supported on one end of the housing. An axial clamping and/or fastening system, in particular a tapered locking arrangement, is provided on the opposite end of the housing.

Claims

1. A submersible pump, comprising: a casing having a suction-side inlet opening, a pressure-side outlet opening and a through-passage for electric lines; an electronics unit; an electric motor; a pressure chamber; a pump unit; and a securing assembly, wherein the electric motor is arranged to drive the pump unit, the electronics unit at least one of controls electric power for driving the electric motor and processes information signals, the electronics unit, the electric motor, the pressure chamber and the pump unit are configured for assembly into a preassembled insert configured to be introduced into the casing and supported at a first end of the casing, and the securing assembly is at least one of an axial clamping and fastening system configured to be located at a second end of the casing opposite the first end, and is arranged to secure and apply a prestress to the preassembled insert in the casing, the at least one of axial clamping and fastening system including a pressure-exerting piece, a snap-fitting element supported against the casing and connected to the pressure-exerting piece by latching, a conical inner clamping ring having a radially-inner surface with threads and a radially-outer surface abutting a radially-inner surface of the snap-fitting element, and an outer clamping ring arranged radially within the inner clamping ring and axially abutting the pressure-exerting piece, the outer clamping ring having outer surface threads engaged with the inner surface threads of the inner clamping ring.

2. The submersible pump as claimed in claim 1, wherein the securing assembly is releasable from the casing.

3. The submersible pump as claimed in claim 2, wherein that the securing assembly includes a taper lock clamping bushing.

4. The submersible pump as claimed in claim 1, wherein at least one of the electronics unit, the electric motor, the pressure chamber and the pump unit is provided with at least one device configured to provide radial support against the casing.

5. The submersible pump as claimed in claim 1, further comprising: a bearing configured to support the insert centered in the casing, the bearing being provided in a region of the pressure-side outlet opening.

6. The submersible pump as claimed in claim 1, wherein the electric motor is a synchronous motor having permanent magnets.

7. The submersible pump as claimed in claim 1, wherein the pump unit is a centrifugal pump.

8. The submersible pump as claimed in claim 1, wherein the pump unit is a positive-displacement pump.

9. The submersible pump as claimed in claim 8, wherein the positive-displacement pump is an eccentric screw pump.

10. The submersible pump as claimed in claim 1, wherein a pressure line provided at the pressure-side outlet opening is configured to serve as a traction mechanism for retaining the submersible pump.

11. A method for assembling a submersible pump, the submersible pump comprising a casing having a suction-side inlet opening, a pressure-side outlet opening and a through-passage for electric lines; an electronics unit; an electric motor; a pressure chamber; a pump unit; and a securing assembly, wherein the electric motor is arranged to drive the pump unit, the electronics unit at least one of controls electric power for driving the electric motor and processes information signals, the electronics unit, the electric motor, the pressure chamber and the pump unit are configured for assembly into a preassembled insert configured to be introduced into the casing and supported at a first end of the casing, and the securing assembly is at least one of an axial clamping and fastening system configured to be located at a second end of the casing opposite the first end, and is arranged to secure and apply a prestress to the preassembled insert in the casing, the at least one of axial clamping and fastening system including a pressure-exerting piece, a snap-fitting element supported against the casing and connected to the pressure-exerting piece by latching, a conical inner clamping ring having a radially-inner surface with threads and a radially-outer surface abutting a radially-inner surface of the snap-fitting element, and an outer clamping ring arranged radially within the inner clamping ring and axially abutting the pressure-exerting piece, the outer clamping ring having outer surface threads engaged with the inner surface threads of the inner clamping ring, comprising the steps of: inserting the preassembled insert into the casing; and securing the preassembled insert in the casing with the securing assembly to brace and fasten the preassembled insert in the casing.

12. The method for assembling the submersible pump as claimed in claim 11, wherein the preassembled insert is positioned centered in the casing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a submersible pump according to an embodiment of the invention.

(2) FIG. 2 shows a detail-form view from FIG. 1, and

(3) FIG. 3 shows an isometric illustration of the detail-form view of FIG. 2.

DETAILED DESCRIPTION OF THE DRAWINGS

(4) FIG. 1 shows a submersible motor pump 1 according to the invention. A casing 2 contains, as indicated at the upper end, a drive 3 and electronics unit 3a, which is connected to the actual pump element via a coupling element 4. The pump element, in the example illustrated, is designed as an eccentric screw pump, comprising a stator 5 and a rotor 6, which are constituted by a metal/elastomer pairing or a plastics/elastomer pairing. A detail, comprising the clamping system 7, is marked at the lower end of the submersible pump 1. The eccentric screw pump allows water to be delivered continuously, wherein the pump may be self-priming. The technology made up of the stator 5 and rotor 6 is very robust and can be used even in an abrasive, for example sandy, environment. The coupling element 4, which is configured as a long rod, passes through pressure chamber 2a and makes it possible to establish a connection between the eccentric rotor 5 and the drive 3. The drive 3 used is typically an electric motor. In order to achieve a high power density, use is made of a synchronous motor equipped with permanent magnets. This achieves small structural dimensioning, as a result of which the costs for a deep well hole can be reduced to a considerable extent. The fluid flowing from the pressure chamber 2a past the drive 3 and bearing 2c is received via pressure-side outlet opening 2b into pressure line 14.

(5) The individual components of the submersible pump are introduced into the casing 2 from below. For assembly, in the first instance the drive 3 is placed in the casing 2, the drive 3 already having been connected to the rod, as coupling element 4, and to the rotor 5. The clamping system 7 according to the invention, in the form of a taper lock clamping system, is provided for secure, rotationally fixed fastening of the insert in the casing 2.

(6) FIG. 2 shows the details of the axial clamping and/or fastening system of the submersible pump. A pressure-exerting piece 8 encloses the stator 5 and, at the lower end of the stator 5, provides a pressure-exerting surface for the rest of the components of the clamping system 7. This pressure-exerting piece 8 is followed directly by a snap-fitting element 9, the latter being fixedly connected to the pressure-exerting piece 8 by a latching function and being supported against the casing 2. A conical, inner clamping ring 10, which forms the taper bushing, is arranged in abutment against the snap-fitting element 9. Said inner clamping ring 10, which is provided with a thread, has arranged within it an outer clamping ring 11, which is likewise provided with a thread, this allowing it to be braced with the inner clamping ring 10. The two clamping rings are braced such that they are supported against the snap-fitting element 9, that is to say also against the casing 2. A feather key 12 is provided, in addition, to prevent rotation. For simplified installation of the clamping system, cutouts 13 are provided on the outer clamping ring 11, these allowing a suitable tool to be applied for bracing purposes. The embodiment with cutouts 13 makes it possible to provide a predefined, straightforward and cost-effective means for applying a tool, which considerably increases the functional reliability and ease of installation.

(7) FIG. 3 shows an isometric illustration of the submersible pump 1, in particular the detail of the clamping system 7 from FIG. 1 being shown. In the right-hand part of the figure, the stator 5 and the rotor 6 is illustrated in the casing 2. The arrangement of the individual components of the axial clamping and/or fastening system is shown on the left-hand side of FIG. 3. The casing 2 is followed directly by the snap-fitting element 9. The latter is fixedly connected to the pressure-exerting piece 8. The conical inner clamping ring 10 and the outer clamping ring 11, which is, for example, screw-connected thereto, is illustrated within the pressure-exerting piece 8. The illustration depicts the locations for applying a tool for screwing the outer clamping ring 11 into the inner clamping ring 10, said rings being braced with one another as a result of the conical shape of the inner clamping ring 10, in which case they are supported radially against the casing 2.

(8) As an alternative, the invention can also be used in a submersible pump of which the motor is accommodated in a separate casing.

LIST OF DESIGNATIONS

(9) 1 Submersible pump 2 Casing 3 Drive 4 Coupling element 5 Stator 6 Rotor 7 Clamping system 8 Pressure-exerting piece 9 Snap-fitting element 10 Inner clamping ring 11 Outer clamping ring 12 Feather key 13 Cutouts

(10) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.