| 摘要 |
Liquid level-controlled submersible motor-driven pumps use so-called float switches which are capable of movement in the direction of buoyancy and enable or disable the power supply to the pump motor via a switching element, depending on their position. To this end, it is customary to use float switches which are capable of moving roughly along a reference circle on the pump housing with the aid of flexible cables. In another configuration, floats are used which actuate a switch located in the pump housing. These pumps are consequently comparatively expensive and difficult to test, in that there may be an electrical or mechanical fault either in the pump circuitry or in the pump motor itself. In the case of the pumps with floats moving along a reference circle, free movement of the float can be obstructed by objects in the liquid or by the shaft wall, the result being that the pump is no longer switched on and off automatically. An electric submersible motor-driven pump (1) is therefore proposed, in which the float (8) and the switch (10) are accommodated in a separate component (6), which can be attached to the housing (2) of the submersible motor-driven pump (1) in detachable fashion and where the switch (10) interacts with a switchable adapter plug located outside the medium to be conveyed, between a power source and the pump motor (3). In this way, the pump can be converted to automatic control, in addition to which the function can be monitored more easily and free movement of the float is guaranteed.
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