Downhole pump, submersible motor pump or submersible motor agitator

Abstract

The invention relates to a borehole pump, submersible motor pump (1) or submersible motor agitator (26) with a submerged motor housing (3), an electric motor (6) arranged inside the motor housing (3) for driving an impeller of the borehole pump, the submersible motor pump (1) or the submersible motor agitator (26), and a cable entry (9) and / or a connector arranged on the motor housing (3) for electrically connecting the electric motor (6), wherein a vibration and / or acceleration sensor (17) is provided inside and / or on the cable entry (9) and / or the connector for detecting vibrations and / or accelerations of the borehole pump, the submersible motor pump (1) or the submersible motor agitator (26) in order to record an operating parameter of the borehole pump, the submersible motor pump (1) or the submersible motor agitator (26).

Description

Technical field

[0001] The invention relates to a borehole pump, submersible motor pump or submersible motor mixer with a submerged motor housing, an electric motor arranged inside the motor housing for driving an impeller of the borehole pump, submersible motor pump or submersible motor mixer, and a cable entry arranged on the motor housing and / or a connector arranged on the motor housing for electrically connecting the electric motor. Background of the invention

[0002] Borehole pumps, submersible motor pumps and submersible motor mixers are known from the prior art.

[0003] Borehole pumps are used to pump liquids, usually water, from boreholes, particularly from great depths. The motor housing of a borehole pump is typically long and narrow for easy insertion into the borehole. The motor housing is usually completely submerged in the pumped medium. The pumped medium is then conveyed from the borehole to the surface via vertical pipelines. Borehole pumps are used especially in wells for water supply and in geothermal energy applications.

[0004] Submersible pumps, also known simply as submersible pumps, are versatile and capable of handling large flow rates for clear and / or dirty water. They are particularly useful for drainage, well and drinking water supply, garden and pond irrigation, and industrial applications. A key characteristic of submersible pumps is that their motor housing is at least partially, and often completely, immersed in the pumped medium.

[0005] Submersible agitators are used to stir and mix liquids such as clear water, dirty water, and / or wastewater as the mixing medium and are often completely immersed in the mixing medium. Instead of an impeller as used in borehole pumps and submersible pumps, the submersible agitator uses a similarly designed impeller or propeller, which can therefore also be described as an impeller. Submersible agitators are used in wastewater treatment plants, industrial processes, agriculture, and water purification.

[0006] Such borehole pumps, submersible motor pumps, and submersible motor agitators typically use a vibration and / or acceleration sensor to detect vibrations and / or accelerations of the borehole pump, submersible motor pump, or submersible motor agitator in order to record an operating parameter of the borehole pump, submersible motor pump, or submersible motor agitator. Such a vibration and / or acceleration sensor is usually located inside the motor housing adjacent to an electric motor that drives the borehole pump, submersible motor pump, or submersible motor agitator.

[0007] In the event of a defect in the vibration and / or acceleration sensor, the motor housing often has to be opened in a complex process to remove and replace the defective sensor. Particularly in the aforementioned applications of borehole pumps, submersible motor pumps, and submersible motor mixers in wastewater treatment plants, industrial processes, or water treatment, such a replacement often results in a lengthy and therefore costly interruption of production. Description of the invention

[0008] Starting from this situation, it is an object of the present invention to provide a borehole pump, submersible motor pump or submersible motor mixer whose vibration and / or acceleration sensor is replaceable in a significantly simpler manner.

[0009] The object of the invention is achieved by the features of the independent claim. Advantageous embodiments are specified in the dependent claims.

[0010] Accordingly, the task is solved by a borehole pump, submersible motor pump or submersible motor mixer with a submerged motor housing, an electric motor arranged inside the motor housing for driving an impeller of the borehole pump, submersible motor pump or submersible motor agitator, and a cable entry and / or a connector arranged on the motor housing for electrically connecting the electric motor, wherein a vibration and / or acceleration sensor is provided inside and / or on the cable entry and / or the connector for detecting vibrations and / or accelerations of the borehole pump, submersible motor pump or submersible motor agitator in order to record an operating parameter of the borehole pump, submersible motor pump or submersible motor agitator.

[0011] Compared to conventional designs where the motor housing had to be opened to access the vibration and / or acceleration sensor for maintenance or repair – a process that is usually quite complex and time-consuming – the proposed solution eliminates the need to open the motor housing. Since, in the event of a malfunction, only the cable entry and / or the connector with the vibration and / or acceleration sensor integrated within it needs to be replaced, opening the motor housing is no longer necessary, thus significantly simplifying maintenance. Positioning the vibration and / or acceleration sensor at or within the cable entry and / or in the connector also improves the durability and reliability of the borehole pump, submersible pump, or submersible agitator.

[0012] In other words, in the proposed solution, the vibration and / or acceleration sensor is not located within the motor housing at a spatial distance from the cable entry and / or connector, for example, directly on the electric motor, but rather within and / or associated with the cable entry and / or connector. Such an arrangement does not preclude the possibility that the vibration and / or acceleration sensor could extend from the cable entry and / or connector into the motor housing, or even be located within the motor housing at or part of the cable entry and / or connector. Crucially, replacing the cable entry and / or connector can, and often does, necessitate replacing the vibration and / or acceleration sensor.

[0013] Positioning the vibration and / or acceleration sensor on, in, and / or inside the cable entry and / or connector allows for more accurate measurements, as vibrations from the motor housing and / or pump housing can be transmitted more precisely to the vibration and / or acceleration sensor at its predefined position on and / or inside the cable entry and / or connector. Compared to prior art solutions where vibration and / or acceleration sensors are mounted on circuit boards inside the motor housing, this arrangement of the vibration and / or acceleration sensor on and / or inside the cable entry and / or connector results in higher efficiency and accuracy of the measurements.

[0014] The proposed arrangement of the vibration and / or acceleration sensor reduces maintenance time and resource expenditure, as opening the motor housing is no longer necessary to replace a defective sensor. Furthermore, placing the vibration and / or acceleration sensor at and / or within the cable entry and / or connector increases the service life and reliability of the borehole pump, submersible pump, or submersible agitator. Compared to vibration and / or acceleration sensors on circuit boards inside the motor housing, relocating the sensor to and / or within the cable entry and / or connector facilitates improved sensor signal quality and measurement accuracy.Overall, this arrangement provides a simplified, efficient and more accurate solution for borehole pumps, submersible motor pumps and submersible motor mixers.

[0015] The borehole pump, submersible motor pump, and / or submersible motor agitator can, in principle, be designed as known from the prior art, in particular as a centrifugal pump. In this respect, the borehole pump and / or submersible motor pump, also called a submersible pump, can, in particular, have a pump housing preferably attached to and / or mounted on the motor housing, in which the impeller is provided. The impeller is preferably connected to the electric motor in a rotationally fixed manner by means of a shaft, in particular a motor shaft. In the case of the submersible motor agitator, the impeller is preferably designed as an agitator vane or propeller. The motor housing is preferably designed to be fluid-tight. The term "submerged motor housing" means that the motor housing, particularly during normal operation, is at least partially, and especially preferably completely, located in the medium to be pumped or agitated, for example, water or wastewater.Therefore, the term "submerged motor housing" is to be understood as meaning that the motor housing is at least partially, preferably completely, surrounded by the conveying or stirring medium.

[0016] The cable entry and / or connector are preferably removable and arranged on the motor housing. The cable entry and / or connector can be designed in accordance with the prior art, in particular being dustproof, dirtproof, and / or moisture-proof for insertion into the motor housing. For example, the cable entry and / or connector can have a cylindrical, cylindrical, or oval-shaped housing that can be inserted into the motor housing.

[0017] Furthermore, the cable entry and / or connector may have a sealing ring, for example a rubber seal, a screw connection, for example a union nut and / or a cap, for compression and sealing by means of the rubber seal, and / or a threaded part for fixed connection to the motor housing. Likewise or alternatively, the cable entry and / or connector may have a clamping device, on the one hand for fastening to the motor housing and / or for securing and / or relieving strain on a connecting cable attached to the cable entry and / or connector for electrically connecting the electric motor.

[0018] The cable entry and / or connector can be made of plastic, for example polyamide, metal, and / or a combination thereof. The cable entry and / or connector can also be designed to connect the motor housing to a single connecting cable or to multiple connecting cables, particularly as a main and control cable entry. The connector can be a female or male connector, in particular a socket or plug, and a mating connector can be provided on the motor housing to which the connector can be connected. The cable entry and / or connector can also include conductors or wires for transmitting electrical control signals.

[0019] As previously discussed, "within the cable entry and / or connector" means that the vibration and / or acceleration sensor is associated with the cable entry and / or connector. In contrast, in the prior art, the vibration and / or acceleration sensor is associated with the motor housing and / or the electric motor, for example, fixedly mounted inside or outside the motor housing. With the proposed solution, the vibration and / or acceleration sensor associated with the cable entry and / or connector can be replaced by replacing the cable entry and / or connector. The detected operating parameter characterizes, in particular, the detected vibration and / or acceleration, which preferably represents periodic mechanical oscillations of the borehole pump, submersible pump, or submersible agitator around an equilibrium point.These oscillations, and thus the vibrations themselves, can be quantified as operating parameters by their acceleration, velocity, displacement and / or frequency, and include, for example, oscillation frequency and / or amplitude, particularly in the form of peak-to-peak, peak level, average level and / or RMS, effective value measurements.

[0020] In a preferred embodiment of the borehole pump, submersible motor pump, or submersible motor agitator, the vibration and / or acceleration sensor is connected to the cable entry and / or the connector and / or the motor housing via vibration damping. Preferably, the vibration and / or acceleration sensor is rigidly connected to the cable entry and / or the connector and / or the motor housing, for example, by screws or rivets. Alternatively, the vibration and / or acceleration sensor can be rigidly connected to the cable entry and / or the connector and / or the motor housing by means of a rigid intermediate element, such as a metal mounting plate.

[0021] According to another preferred embodiment of the borehole pump, submersible pump, or submersible agitator, the vibration and / or acceleration sensor is configured to detect vibrations and / or oscillations up to 1 kHz, preferably up to 500 Hz, and particularly preferably up to 300 Hz. According to a further preferred embodiment of the borehole pump, submersible pump, or submersible agitator, the vibration and / or acceleration sensor is configured to detect vibrations and / or oscillations in two, preferably three, dimensions. The vibration and / or acceleration sensor is, for example, designed as a MEMS (Micro-Electro-Mechanical Systems) sensor or as a piezoelectric sensor and / or as a 1-axis, 2-axis, or 3-axis sensor.

[0022] According to another preferred embodiment of the borehole pump, submersible motor pump, or submersible motor agitator, the cable entry and / or the connector is routed through the motor housing and / or inserted into the motor housing. Preferably, the cable entry and / or the connector is routed through the motor housing in a fluid-tight, pressure-tight, and / or dust-tight manner, or is designed accordingly. Preferably, the cable entry and / or the connector has a collar extending radially with respect to an insertion direction, which seals the opening around its circumference, for example, by means of a seal, against the ingress of the pumped medium or agitator medium into the motor housing. Particularly preferably, a circumferential groove is formed in the collar, which receives the seal, for example, an O-ring seal. Further preferably, the cable entry and / or the connector is designed to be permanently installed in the motor housing. The term "routed through" or "inserted into" refers to the following:"Inserted" means, in particular, that at least part of the cable entry and / or connector is routed or inserted through the motor housing and is located inside the motor housing during normal operation. In this respect, for example, a first part of the cable entry and / or connector may be located outside the motor housing, while a second part, such as the plug contacts of the connector, is inserted into the motor housing, i.e., protrudes into the motor housing.

[0023] In a further preferred embodiment of the borehole pump, submersible motor pump, or submersible motor agitator, the motor housing has an opening that can be closed, particularly fluid-tight and / or pressure-tight, by means of the cable entry and / or the connector. The opening is preferably circular, oval, or rectangular, although other shapes are also conceivable. Preferably, the opening is located on the top side of the borehole pump, submersible motor pump, or submersible motor agitator during normal operation. Preferably, the opening is submerged during normal operation, i.e., within the pumped or agitated medium. The cable entry and / or the connector preferably has an outer shape corresponding to the opening.

[0024] According to another preferred embodiment of the borehole pump, submersible motor pump, or submersible motor agitator, the cable entry and / or the connector has a housing that can be inserted from outside the motor housing through the opening into the motor housing such that, in the inserted state, the vibration and / or acceleration sensor is located inside the motor housing. Preferably, the vibration and / or acceleration sensor is located at least partially, and in particular completely, inside the motor housing in the inserted state. In this way, the vibration and / or acceleration sensor is protected against external influences. The housing is preferably at least partially insertable into the opening, in particular such that the housing projects through the opening. Preferably, the housing rests against the opening, in particular in contact with it, to seal the opening against the ingress of, for example, the pumped medium.

[0025] According to another preferred embodiment of the borehole pump, submersible motor pump or submersible motor agitator, the vibration and / or acceleration sensor is encapsulated within the cable entry and / or the connector and / or the cable entry and / or the connector comprises a connecting cable which is encapsulated with the cable entry and / or the connector, and / or with the cable entry and the connecting cable, wherein the connecting cable is connected, in particular soldered, and encapsulated with a circuit board of the vibration and / or acceleration sensor.

[0026] The encapsulation is preferably carried out using a potting compound to protect the vibration and / or acceleration sensor against external influences and / or to ensure stable, permanent operation and / or connection with the connecting cable. Suitable potting compounds include, for example, epoxy resin, polyurethane, acrylates, and / or silicone. Preferably, the vibration and / or acceleration sensor is encapsulated in such a way that the electronic components of the sensor are embedded in the potting compound, while the sensor itself remains removable from and within the cable entry and / or connector.For example, the vibration and / or acceleration sensor may have a circuit board connector, also called an edge connector or edge connector, by means of which the vibration and / or acceleration sensor is plugged onto the cable entry and / or the connector in regular operation, especially inside the motor housing.

[0027] According to another preferred embodiment of the borehole pump, submersible motor pump, or submersible motor agitator, the cable entry and / or the connector can be screwed to the motor housing. Preferably, the cable entry and / or the connector has a nut that can be screwed onto a thread of the motor housing, in a fluid-tight and / or dust-tight manner. Particularly preferably, the nut is provided with a seal, for example, a circumferential O-ring seal.

[0028] In a further preferred development of the borehole pump, submersible motor pump, or submersible motor agitator, a motor controller for controlling the electric motor is provided within and / or at the cable entry and / or the connector. Compared to conventional designs where the motor housing had to be opened to access the motor controller for maintenance or repair purposes, which is usually quite complex and time-consuming, the proposed solution eliminates the need to open the motor housing. Since, in the event of a malfunction, only the cable entry and / or the connector with the motor controller integrated within it needs to be replaced, opening the motor housing is no longer necessary, thus significantly simplifying maintenance. By arranging the motor controller at or...The cable entry and / or connector also improves the durability and reliability of the borehole pump, submersible pump, or submersible agitator. The motor control system includes, in particular, a microprocessor or microcontroller, which is integrated into or inserted into the cable entry and / or connector, or mounted on top of it.

[0029] In other words, in the proposed solution, the motor control unit is not located within the motor housing at a spatial distance from the cable entry and / or connector, for example, directly on the electric motor, but rather within and / or associated with the cable entry and / or connector. Such an arrangement does not preclude the possibility that the motor control unit could extend from the cable entry and / or connector into the motor housing, or even be located within the motor housing at or part of the cable entry and / or connector. The crucial point is that replacing the cable entry and / or connector can, and often does, necessitate replacing the motor control unit.

[0030] According to another preferred embodiment of the borehole pump, submersible motor pump, or submersible motor agitator, the motor control unit comprises a printed circuit board on which the vibration and / or acceleration sensor and a microprocessor or microcontroller are arranged. The motor control unit is particularly Linux-based and / or includes a web server. The microprocessor or microcontroller is preferably configured to control the electric motor. For this purpose, the motor control unit can include a program that can be executed by the microprocessor or microcontroller to control the electric motor. Preferably, the motor control unit is configured to control the electric motor by means of externally received control signals, i.e., control signals received from outside the borehole pump, submersible motor pump, or submersible motor agitator. Linux-based means, in particular, that an operating system with a Linux kernel architecture is provided on the microprocessor or microcontroller.Preferably, the operating system is designed to be modifiable and / or configurable via the web server. The web server is particularly preferably used, on the one hand, for programming the motor control and / or, on the other hand, for displaying and / or visualizing operating parameters of the borehole pump, the submersible pump, or the submersible agitator.

[0031] In a further preferred embodiment of the borehole pump, submersible motor pump, or submersible motor agitator, the device has an inverter for the electric motor arranged within the motor housing, wherein the motor control is configured to monitor and / or control the inverter. The inverter is preferably located within an inverter housing and / or adjacent to the electric motor and / or adjacent to the cable entry and / or the connector. Preferably, the motor control is configured to monitor and / or control the inverter by means of at least one sensor as described below.

[0032] According to another preferred embodiment of the borehole pump, submersible pump, or submersible agitator, the motor control is configured to control at least one further electric motor of at least one further borehole pump, at least one further submersible pump, or at least one further submersible agitator. In other words, the motor control is configured, for example by means of a suitable program, to control the at least one further borehole pump, the at least one further submersible pump, or the at least one further submersible agitator. The at least one further borehole pump, the at least one further submersible pump, or the at least one further submersible agitator can, for example, be located adjacent to or at a distance from the borehole pump, the submersible pump, or the submersible agitator and / or be connected to it via the Ethernet interface.

[0033] According to a further preferred embodiment of the borehole pump, the submersible motor pump or the submersible motor mixer, this / the pump has a sensor device arranged within the motor housing for detecting at least one respective operating parameter of the borehole pump, the submersible motor pump or the submersible motor mixer, wherein the sensor device is arranged spatially separate from the motor control and is connected to the motor control by means of a fieldbus.According to another preferred embodiment of the borehole pump, submersible motor pump, or submersible motor agitator, the sensor device comprises a plurality of sensors connectable to the sensor device for detecting a respective operating parameter of the borehole pump, submersible motor pump, or submersible motor agitator, wherein the sensor device comprises a sensor board and a plurality of sensor connectors provided thereon for connecting the plurality of sensors, and / or wherein the sensor device is arranged adjacent to the electric motor. In this respect, it is possible that no sensors are located on the sensor board itself, but rather that the sensors are arranged separately from the sensor board, for example, directly on the electric motor.

[0034] Accordingly, the motor control unit is designed to be spatially separated from the sensors, which are, for example, mounted on the electric motor. The sensor unit preferably includes a microcontroller or similar device to transmit sensor signals received from the sensors to the motor control unit via the fieldbus. The sensor unit can either forward the sensor signals to the motor control unit unfiltered via the fieldbus or perform preprocessing, such as filtering, of the sensor signals before forwarding the preprocessed signals. The sensor unit preferably includes a sensor housing containing the sensor board and sensor connectors. In principle, any fieldbus known from the prior art can be used, such as Modbus or Profibus.The sensors can be designed, for example, as humidity sensors and / or temperature sensors. Alternatively, or in addition, the motor control unit can have other sensors, such as humidity and / or temperature sensors.

[0035] An operating parameter is typically understood to be a measured quantity or characteristic value that relates specifically to the operation of a borehole pump, submersible pump, or submersible agitator. In a simple case, the operating parameter refers, for example, to the instantaneous delivery rate of the borehole pump, submersible pump, or submersible agitator. The operating parameter can include, for example, measurement data, a signal, and / or a value. The operating parameter can represent a physical or dimensioned characteristic value, refer to physical quantities, and / or be a dimensionless characteristic value. The operating parameter can be selected from a rotational speed or...a speed of the electric motor of the borehole pump, submersible pump or submersible agitator, a delivery head, an intermediate circuit voltage, a motor current, a temperature, a oscillation, a vibration, an electrical power, an operating voltage, a volume flow and / or a vibration function of the borehole pump, submersible pump or submersible agitator. Brief description of the drawings

[0036] The invention is explained in more detail below with reference to the accompanying drawings and by way of preferred embodiments.

[0037] The drawings show Fig. 1 a schematic perspective view of a submersible motor pump according to a preferred embodiment of the invention, Fig. 2 a schematic perspective partially opened view of the submersible motor pump according to Fig. 1 , Fig. 3 a schematic perspective view of a cable entry of the submersible motor pump according to Fig. 1 According to a preferred embodiment of the invention, Fig. 4 shows a schematic perspective partially opened view of the cable entry. Fig. 3 , Fig. 5 a schematic perspective view of a sensor device of the submersible motor pump according to Fig. 1 according to a preferred embodiment of the invention, and Fig. 6 a schematic partially opened side view of a submersible motor mixer according to a preferred embodiment of the invention. Detailed description of the implementation examples

[0038] Fig. 1 shows a schematic perspective view of a submersible motor pump 1 according to a preferred embodiment of the invention, while Fig. 2 a schematic perspective partially opened view of the submersible motor pump 1 of the Fig. 1 shows.

[0039] The submersible motor pump 1 has a pump housing 2 with a motor housing 3 mounted axially on top of the pump housing 2 in the plane of the drawing and screwed onto it. The pump housing 2 has an inlet 4 or suction port, shown only in the plane of the drawing, through which a pumped medium, for example water or wastewater, is drawn in by means of an impeller (not shown) provided in the pump housing 2, and then pumped out through an outlet nozzle 5 located radially on the side of the pump housing 2.

[0040] Within the motor housing 3, which, like the pump housing 2, is made of metal, an electric motor 6 is provided, which drives the impeller by means of an axially extending motor shaft (not shown). The axially cylindrical motor housing 3, and correspondingly the pump housing 2 arranged axially below it in the plane of the drawing, are submerged; during normal operation, they are at least partially, and in particular completely, immersed in the pumped medium.

[0041] The motor housing 3 is made of two parts, which are connected to each other by axially extending screws. The electric motor 6 is arranged in the lower cylindrical part, while in the upper closed, hood-like part, an inverter 7 connected to the electric motor 6 is provided within a cylindrical inverter housing. On the outside of the upper hood-like part, a handle 8 for setting up and transporting the submersible motor pump 1 is integrally formed axially at the top in the plane of the drawing.

[0042] Two cable entries 9 are provided on the upper hood-like part, each radially spaced from each other and from the handle 8, through corresponding openings and slightly inclined axially through the motor housing 3 for the insertion of main and control lines 10 as connection cables for the submersible motor pump 1. Fig. 1Both cable entries 9 are shown in the partially opened view of the submersible motor pump 1. Fig. 2 Only a single cable entry 9 is shown. Similarly, the submersible motor pump 1 may have only a single cable entry 9 for the main and control lines 10. The cable entry 9 may also be designed as a connector (not shown).

[0043] The in Fig. 3 schematically, perspectively, and in Fig. 4 The cable entry 9, shown schematically in perspective and partially opened, has a cylindrical metal housing 11 that passes through the opening of the motor housing 3 such that, during normal operation, an outer part is located outside the motor housing 3 and an inner part is located inside the motor housing. An oval-shaped collar 12, extending radially away from the cylindrical housing 11 in axial plan view, is provided on the outer part and abuts the motor housing 3.

[0044] The collar 12 has two oppositely arranged bores through which screws are passed into the motor housing 3 to permanently attach the cable entry 9 to the motor housing 3. The collar 12 has a groove extending around the cylindrical housing 11, into which an O-ring seal (not shown) is inserted, thus sealing the collar 12 and therefore the cable entry 9 against the motor housing 3 in a fluid-tight manner. The control cable 10 is inserted into the outside of the cylindrical housing 11 and is fluid-tightly fixed to the cable entry 9 by means of a union nut 13 and a sealing ring (not shown) compressed by the union nut 13.

[0045] A motor control unit 14 for controlling the electric motor 6 is provided within the cable entry 9. The motor control unit 14 is located on the inner part of the cable entry 9 and is therefore situated within the cable entry 9. During normal operation of the submersible pump 1, or when the cable entry 9 is installed, the motor control unit 14 is located within the motor housing 3. The motor control unit 14 comprises a printed circuit board 15 with a microprocessor 16 or a microcontroller mounted on it, as well as other electronic components provided on the printed circuit board 15. The microprocessor 16 has a Linux-based operating system on which a control algorithm for starting the electric motor 6 and for cleaning the submersible pump 1 runs.

[0046] The Linux-based operating system also runs a web server, which allows the control algorithm to be parameterized. Furthermore, the motor controller 14 is configured by means of the control algorithm to monitor and control the inverter 7. In addition, the control algorithm of the motor controller 14 is configured to receive sensor data, in particular pressure and / or temperature, from the submersible pump 1, specifically for controlling the submersible pump 1 and, if necessary, for fault diagnosis and / or reporting of the submersible pump 1. The control algorithm also allows the control of at least one additional electric motor of at least one additional submersible pump, which is located remotely or adjacent to the submersible pump 1.

[0047] Additionally or alternatively, a vibration and / or acceleration sensor 17 is provided within the cable entry 9 for detecting vibrations and / or accelerations of the borehole pump 1 in two, preferably three, dimensions in order to record an operating parameter of the borehole pump 1. The vibration and / or acceleration sensor 17 is arranged on the circuit board 15 and thus also on the inner part of the cable entry 9 and within the cable entry 9, as well as during regular operation of the submersible pump 1 or in its installed state within the motor housing 3. In this way, the vibration and / or acceleration sensor 17 is vibrationally connected to the cable entry 9 and to the motor housing 3. The vibration and / or acceleration sensor 17 is configured to detect vibrations and / or oscillations up to 1 kHz, preferably up to 500 Hz, and particularly preferably up to 300 Hz.

[0048] The motor control unit 14, including the circuit board 15 with the electronic components mounted on it, the microprocessor 16, and the vibration and / or acceleration sensor 17, is potted with a potting compound. The circuit board 14 is axially inserted into a corresponding socket 18 provided on the cable entry 9 by means of a connector provided on the circuit board, thus making the motor control unit 14 replaceable. In its assembled state, the circuit board 14 extends from the socket 18 into the motor housing 3 and is covered by a plastic cap 19 that can be axially attached to the cable entry 9.

[0049] One end of the connecting cable 10 is also potted within the cable entry 9, and the connecting cable 10 is soldered to another circuit board provided within the cable entry 9. This additional circuit board may also include an Ethernet interface, in particular a Single Pair Ethernet interface, which can be contacted via the connecting cable 10. The Single Pair Ethernet interface is preferably designed according to an IEEE 802.3 SPE standard, for example, 802.3bp 2016-06, 802.3bw 2015-10, 802.3da, 802.3dg, 802.3cg 2019-11, or the like. Furthermore, this additional circuit board includes a socket 18 and two plugs 20, which, when the cable entry 9 is installed, extend axially into the motor housing 3. The plugs 20 can be used to connect wires for a safety circuit of the electric motor 6.

[0050] Furthermore, connector 20 allows for a connection in Fig. 5The sensor device 21 shown can be contacted, wherein the motor control 14 and the sensor device 21 communicate with each other via a fieldbus. The sensor device 21 is provided in a sensor housing 22, wherein in Fig. 5 A sensor board 23 is shown removed from the sensor housing 22, which is only partially shown, in the manner of an exploded view.

[0051] As from Fig. 2 As can be seen, the sensor device 21 is spatially separated, and therefore not located, from the motor control unit 14 or the cable entry 9 within the motor housing 3. Specifically, the sensor device 21 is located on the inverter 7 approximately 10 to 15 cm away from the cable entry 9 and, as described above, is connected to the motor control unit 14 via the fieldbus. As shown in the diagram, the sensor device 21 is located approximately 10 to 15 cm away from the cable entry 9 and is connected to the motor control unit 14 via the fieldbus. Fig. 5As can be seen, a plurality of sensor connectors 24 are provided on the sensor circuit board 23, which can be connected to respective sensors 25, shown only as examples, to record a respective operating parameter of the submersible motor pump 1, for example temperature of the electric motor 6.

[0052] Instead of a submersible motor pump 1, the proposed solution can also be used with a borehole pump (not shown) or a submersible motor agitator 26, where a stirring vane 27 of the submersible motor agitator 26 is to be understood as an impeller. Fig. 6 Figure 1 shows such a submersible motor agitator 26 in a schematically partially opened side view according to a preferred embodiment of the invention with the cable entry 9 and the sensor device 21. The same applies to the connector, which can be designed analogously to the cable entry 9.

[0053] The described embodiments are merely examples that can be modified and / or supplemented in various ways within the scope of the claims. Each feature described for a particular embodiment can be used independently or in combination with other features in any other embodiment. Each feature described for an embodiment of a particular category can also be used accordingly in an embodiment of a different category. Reference symbol list

[0054] Submersible motor pump 1 Pump housing 2 engine housing 3 inlet 4 Outlet nozzle 5 electric motor 6 inverter 7 Handle 8 cable entry 9 Main and control cable, connection cable 10 Housing 11 collar 12 union nut 13 Engine control 14 Circuit board 15 microprocessor 16 Vibration and / or acceleration sensor 17 socket 18 cap 19 Plug 20 Sensor system 21 Sensor housing 22 Sensor board 23 Sensor connector 24 sensor 25 Submersible motor agitator 26 agitator blades 27

Claims

1. A borehole pump, submersible pump (1) or submersible agitator (26) with a submerged motor housing (3), an electric motor (6) arranged inside the motor housing (3) for driving an impeller of the borehole pump, submersible pump (1) or submersible agitator (26), and a cable entry (9) removable from the motor housing (3) and / or a connector arranged on the motor housing (3) for electrically connecting the electric motor (6), wherein a vibration and / or acceleration sensor (17) is provided inside and / or on the cable entry (9) and / or the connector for detecting vibrations and / or accelerations of the borehole pump, submersible pump (1) or submersible agitator (26) for recording an operating parameter of the borehole pump, submersible pump (1) or submersible agitator (26).

2. Borehole pump, submersible motor pump (1) or submersible motor agitator (26) according to the preceding claim, wherein the vibration and / or acceleration sensor (17) is connected to the cable entry (9) and / or the connector and / or to the motor housing (3) via vibration technology.

3. Borehole pump, submersible motor pump (1) or submersible motor mixer (26) according to one of the preceding claims, wherein the vibration and / or acceleration sensor (17) is configured to detect vibrations and / or oscillations up to 1 kHz, preferably up to 500 Hz and particularly preferably up to 300 Hz.

4. Borehole pump, submersible motor pump (1) or submersible motor mixer (26) according to one of the preceding claims, wherein the vibration and / or acceleration sensor (17) is configured to detect vibrations and / or oscillations in two, preferably three dimensions.

5. Borehole pump, submersible motor pump (1) or submersible motor mixer (26) according to any of the preceding claims, wherein the cable entry (9) and / or the connector is passed through the motor housing (3).

6. Borehole pump, submersible motor pump (1) or submersible motor mixer (26) according to one of the preceding claims, wherein the motor housing (3) has an opening which can be closed in a fluid-tight and / or pressure-tight manner by means of the cable entry (9) and / or the connector.

7. Borehole pump, submersible motor pump (1) or submersible motor mixer (26) according to the preceding claim, wherein the cable entry (9) and / or the connector has a housing (11) which can be inserted from outside the motor housing (3) through the opening into the motor housing (3) such that in an inserted state the vibration and / or acceleration sensor (17) is arranged inside the motor housing (3).

8. Borehole pump, submersible motor pump (1) or submersible motor agitator (26) according to any of the preceding claims, wherein the vibration and / or acceleration sensor (17) is encapsulated within the cable entry (9) and / or the connector and / or the cable entry (9) and / or the connector comprises a connecting cable (10) which is encapsulated with the cable entry (9) and / or the connector, and / or with the cable entry (9) and the connecting cable (10), wherein the connecting cable (10) is encapsulated with the vibration and / or acceleration sensor (17).

9. Borehole pump, submersible motor pump (1) or submersible motor mixer (26) according to any of the preceding claims, wherein the cable entry (9) and / or the connector can be screwed to the motor housing (3).

10. Borehole pump, submersible motor pump (1) or submersible motor mixer (26) according to one of the preceding claims, wherein a motor control (14) for controlling the electric motor (6) is provided within the cable entry (9) and / or the connector.

11. Borehole pump, submersible motor pump (1) or submersible motor mixer (26) according to the preceding claim, wherein the motor control (14) comprises a printed circuit board (15) on which the vibration and / or acceleration sensor (17) and a microprocessor (16) or a microcontroller is arranged, and the motor control (14) is in particular Linux-based and / or comprises a web server.

12. Borehole pump, submersible motor pump (1) or submersible motor mixer (26) according to one of the two preceding claims, with an inverter (7) arranged inside the motor housing (3) for the electric motor (6), wherein the motor control (14) is designed to monitor and / or control the inverter (7).

13. Borehole pump, submersible motor pump (1) or submersible motor mixer (26) according to one of the three preceding claims, wherein the motor control (14) is configured to control at least one further electric motor of at least one further borehole pump, at least one further submersible motor pump or at least one further submersible motor mixer.

14. Borehole pump, submersible motor pump (1) or submersible motor agitator (26) according to one of the four preceding claims, with a sensor device (21) arranged within the motor housing (3) for detecting at least one operating parameter of the borehole pump, the submersible motor pump (1) or the submersible motor agitator (26), wherein the sensor device (21) is arranged spatially separate from the motor control (14) and is connected to the motor control (14) by means of a fieldbus.

15. Borehole pump, submersible motor pump (1) or submersible motor agitator (26) according to the preceding claim, wherein the sensor device (21) comprises a plurality of sensors (25) connectable to the sensor device (21) for detecting a respective operating parameter of the borehole pump, the submersible motor pump (1) or the submersible motor agitator (26), wherein the sensor device (21) comprises a sensor board (23) and a plurality of sensor connectors (24) provided thereon for connecting the plurality of sensors (25), and / or wherein the sensor device (21) is arranged adjacent to the electric motor (6).

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