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EP-4739917-A1 - PUMP WITH FLOAT ARM AND HYSTERESIS FUNCTION

EP4739917A1EP 4739917 A1EP4739917 A1EP 4739917A1EP-4739917-A1

Abstract

The invention relates to a submersible motor pump which comprises a float (6) that interacts with a switch (14) for the automated control of the pumping operation. The switch (14) switches the pump on at an upper limit value and switches the pump off at a lower limit value. The switch (14) is connected to a motion member (13) which has an inner magnet (12), the inner magnet (12) being connected to an outer counter magnet (10) which is arranged in a pivotable magnet holder (9). The magnet holder (9) is connected to a lever arm (5) of the float (6) which is designed to be pivotable in its position depending on the surrounding liquid level. The pivoting movement of the magnet holder (9) is at least partially decoupled from the pivoting movement of the float (6).

Inventors

  • HASS, Stephan

Assignees

  • KSB SE & Co. KGaA

Dates

Publication Date
20260513
Application Date
20240618

Claims (13)

  1. 1. Submersible motor pump comprising a float (6) which interacts with a switch (14) for automated control of the pumping process such that the switch (14) switches the pump on at an upper limit value and switches the pump off at a lower limit value, wherein the switch (14) is connected to a movement member (13) which has an inner magnet (12), wherein the inner magnet (12) is connected to an outer counter magnet (10) which is arranged in a pivotable magnet holder (9), wherein the magnet holder (9) is connected to a lever arm (5) of the float (6) which is designed to be pivotable in its position depending on the surrounding liquid level, characterized in that the pivoting movement of the magnet holder (9) is designed to be at least partially decoupled from the pivoting movement of the float (6).
  2. 2. Submersible motor pump according to claim 1, characterized in that the pivoting movement of the magnet holder (9) is decoupled from the pivoting movement of the float (6) by more than 5 °, preferably by more than 10 °, in particular by more than 15 °, and/or by less than 50 °, preferably by less than 45 °, in particular by less than 40 °.
  3. 3. Submersible motor pump according to claim 1 or 2, characterized in that the lever arm (5) has a head (15) which comprises a guide groove (17) and the magnet holder (9) has at least one projection (16) which guide groove (17), wherein the head (15) has at least one segment (23) which forms a stop (24) for forming a pair of active surfaces for the projection (16).
  4. 4. Submersible motor pump according to claim 3, characterized in that when the float position is low, a gap is formed between the segment (23) and the projection (16).
  5. 5. Submersible motor pump according to claim 3 or 4, characterized in that the pair of active surfaces is designed for pivoting movement of the magnet holder (9).
  6. 6. Submersible motor pump according to one of claims 1 to 5, characterized in that the switch (14) is designed as an opener.
  7. 7. Submersible motor pump according to one of claims 1 to 5, characterized in that the switch (14) is designed as a normally closed contact.
  8. 8. Submersible motor pump according to one of claims 1 to 7, characterized in that the inner magnet (12) and the outer counter magnet (10) have an attractive effect.
  9. 9. Submersible motor pump according to one of claims 1 to 7, characterized in that the inner magnet (12) and the outer counter magnet (10) have a repulsive effect.
  10. 10. Submersible motor pump according to one of claims 1 to 9, characterized in that the lever arm (5) and/or the magnet holder (9) and/or the housing (8) have corresponding parts of a clip connection.
  11. 11. Submersible motor pump according to one of claims 1 to 9, characterized in that the lever arm (5) on the magnet holder (9) and/or on the housing (8) has a has a force-locking connection.
  12. 12. Method for the automated control of the pumping process of a submersible motor pump with the following steps: - movement of the float (6) depending on the surrounding liquid level, - Movement of the segment (23) of the lever arm (5) to form the pair of active surfaces with the projection (16) of the magnet holder (9), - Swiveling the magnet holder (9) from a low to an upper position, - Cooperation of the magnets (10, 12) to move the moving member (13), whereby the switch (14) switches on the motor (2) of the pump.
  13. 13. Use of a submersible motor pump according to one of claims 1 to 11 with a float (6) for forming a hysteresis during the pumping process.

Description

pump with float arm and hysteresis function The invention relates to a submersible motor pump comprising a float which interacts with a switch for automated control of the pumping process in such a way that the switch switches the pump on at an upper limit value and switches the pump off at a lower limit value, wherein the switch is connected to a moving member which has an inner magnet, wherein the inner magnet is connected to an outer counter magnet which is arranged in a pivotable magnet holder, wherein the magnet holder is connected to a lever arm of a float which is designed to be pivotable in its position depending on the surrounding liquid level. A sewage pump is also known as a dirty water pump and enables the pumping of heavily contaminated water, which often contains solid components of various organic, inorganic or mineral origins. Sewage pumps are preferably built in one stage and are generally not self-priming. Instead, they are usually completely submerged in the pumped medium. A wet-installed sewage pump is also known as a submersible motor pump. A submersible pump, also known as a submersible pump, is a special type of pump used to pump liquids. The term "submersible pump" refers to the design of the pump where the motor is located directly in the liquid to be pumped. The pump consists of a housing that contains the motor and the impeller. The motor is sealed to be watertight and is immersed directly in the liquid. The impeller is located at the bottom of the pump and is connected to the motor. When the motor is turned on, the impeller rotates and creates a suction force that draws in the liquid and moves it through the pump. Submersible pumps are commonly used in applications where water or other liquids need to be pumped out of pits, wells, basements or other low-lying areas. They are also used in industry, agriculture and construction to drain water or assist in drainage. For installation, the submersible motor pump is usually lowered into the pump sump using a guide. A bracket attached to the pump, which contains a rubber profile seal, allows the submersible motor pump to be connected to the pipe installed in the pump sump with almost no leakage and the unit can be completely flooded. The motor housing, which is wetted from the outside, then transfers the motor heat to the surrounding pumped medium. The submersible motor pump is usually single-stage and built in block construction and may not even require a suction line, as the pumped medium flows to it from all sides. Smaller units are portable and usually equipped with a level-controlled switch for automatic on and off switching. DE 44 34 461 A1 describes a submersible motor pump for heavily contaminated liquids. In order to enable the cleaning of deposits inside the pump, the submersible motor pump, which is equipped with a tangential pressure port and a jacket chamber surrounding the motor and through which the pumped liquid flows, has a flushing connection arranged at the end of the jacket chamber facing away from the pump and which can be connected to an external liquid source. The level-controlled switches on submersible motor pumps are occasionally prone to malfunctions. They are affected by contamination in the liquids and can therefore lead to delays or failure of the switching behavior. In addition, high-frequency switching cycles can lead to a shortened service life of the pump motor. DE 19 745 184 A1 discloses a float switch for switching an electric motor on and off, in particular for a submersible motor pump unit, with a first magnet whose position can be changed by a float depending on the liquid level, which corresponds to a second magnet separated from it by a non-magnetic wall in such a way that the second magnet connected to an actuating element acting on the switch of the electric motor is moved by the approaching first magnet from a first switching position assumed in the uninfluenced state to a second switching position. In order to be able to operate an electric motor equipped with such a float switch optionally with or without a float switch, the invention provides that the two magnets act in a repelling manner on one another. The object of the invention is to provide a submersible motor pump with a float that automatically carries out a pumping process depending on the liquid level. The design of the float should serve to automate the process with a reduced number of switching cycles. In addition, the submersible motor pump with the float should be suitable for pumping contaminated liquids. Furthermore, the submersible motor pump should be characterized by a compact design and be able to be installed wet. The design of the submersible motor pump should facilitate the exchange of spare parts. The submersible motor pump should be easy and inexpensive to implement. This object is achieved according to the invention by a submersible motor pump according to the features of claim 1. Preferred variants can be found i