Abstract
An electric motor arrangement for a pump includes power electronics for control of the electric motor driving the pump. For cooling of the electric motor and/or the power electronics, media from a pump chamber of the pump casing flows through a suction-side connection, a coolant channel associated with the power electronics and/or of the electric motor, to a pressure-side connection of the pump. The flow in the coolant channel may be controlled by a thermostat valve.
Claims
1. An electric motor (1) having connected power electronics (2) and a pump (3), comprising a pump chamber (3) having a suction-side (6) and a pressure-side (5) connection, characterized in that a cooling device of the power electronics (2) and/or the motor is connected to the pump chamber (3).
2. The electric motor (1) as claimed in claim 1, characterized in that the cooling is realized as liquid cooling, wherein the cooling liquid is provided by the delivery fluid delivered by the pump (3).
3. The electric motor (1) as claimed in one of claim 1 or 2, characterized in that a coolant channel (11, 12) is provided to guide the cooling liquid in or on the power electronics (2).
4. The electric motor (1) as claimed in one of claims 1 to 3, characterized in that the cooling liquid runs from the pressure-side connection (5) of the pump casing (3) through the coolant channel (11, 12) to the suction-side connection (6) of the pump casing (3).
5. The electric motor (1) as claimed in one of the preceding claims, characterized in that cooling of the electric motor (1) is provided, wherein a coolant channel (11, 12) are provided in or on the electric motor (1).
6. The electric motor (1) as claimed in one of the preceding claims, characterized in that heat pipes are provided on components of the power electronics (2) and/or the electric motor (1) which are remote from the coolant channel (11, 12), which heat pipes are connected to the coolant channel (11, 12) for cooling purposes.
7. The electric motor (1) as claimed in one of the preceding claims, characterized in that a control element for establishing the flow rate, in particular a thermostat valve, is provided in the supply line (7) and/or the coolant channel (11, 12).
8. The electric motor (1) as claimed in one of the preceding claims, characterized in that the suction-side (5) and pressure-side (6) connections can be retrofitted on existing pump casings by means of adapters.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 shows the basic construction of a pump in longitudinal section,
[0018] FIG. 2 shows a first configuration of a pump according to an embodiment of the invention in longitudinal section,
[0019] FIG. 3 shows an associated cross-section of the pump in FIG. 2,
[0020] FIG. 4 shows a second configuration of a pump according to another embodiment of the invention in longitudinal section,
[0021] FIG. 5 shows a second associated cross-section of the pump in FIG. 4,
[0022] FIG. 6 shows a third associated cross-section of the pump according to another embodiment of the invention,
[0023] FIG. 7 shows a fourth associated cross-section of the pump according to another embodiment of the invention, and
[0024] FIG. 8 shows a fifth associated cross-section of the pump according to another embodiment of the invention.
DETAILED DESCRIPTION
[0025] FIG. 1 shows an electrically driven pump, which is equipped with an electric motor 1 and power electronics 2. The pump can be a centrifugal pump, for example, with other pump types likewise being possible. The illustrated pump has a pump casing 3, which is flange-connected to one of the end shields 4 of the electric motor. Moreover, connections for fluid lines are provided on the pump casing 3; a respective connection for the pressure side 5 and the suction side 6. The supply line 7 and the return line 8 of the cooling system are provided at these connections. Therefore, cold delivery fluid is impressed into the coolant channel on the pressure side 5; on the suction side 6, the delivery fluid is then fed back into the flow of the delivery fluid. The supply line 7 and the return line 8 of the cooling system can be located both inside and outside the pump casing.
[0026] FIG. 2 shows an axial illustration of a pump according to the invention, having spiral coolant channels 11 which are connected directly to the supply line 7 and the return line 8. The coolant channel 11 is routed around the electric motor, wherein the coolant channel 11 can be arranged externally on the casing of the electric motor 1 and/or between the electric motor 1 and the power electronics 2.
[0027] FIG. 3 shows a section through the electric motor 1 and the power electronics 2, wherein the arrangement of the spiral coolant channels 11 around the stator 13 in the motor casing 15 should be noted in particular. The rotor 14 of the electric motor is likewise illustrated schematically. The spiral coolant channel 11 has the two connections: supply line 7 and return line 8.
[0028] FIG. 4 shows an axial illustration of the pump according to the invention, having axial coolant channels 12. In the pump-side A end shield 4a, the still cool delivery fluid is distributed to the individual regions of the coolant channels 12 via a central cold water collection ring 9, which is provided on the pressure side 6. In the opposing B end shield 4b of the electric motor, the coolant flow is deflected and conducted back into the A end shield 4a again via the coolant lines 12, where it is supplied to the return line 8 by means of a hot water collection ring 10. From here, the coolant is supplied to the delivery medium again via the suction side 6, wherein good mixing can already be achieved in a quick and simple manner, depending on the flow rate.
[0029] FIG. 5 shows a section through the electric motor and the power electronics 2 with axial coolant channels 12 in the motor casing 15. Depending on requirements and the manufacturability, the coolant channels 12 can be arranged closer to the stator 13 or further away. The distribution of the cooling medium can take place, here and in the following examples, as disclosed above via specific configurations of the conduit in the end shields. In particular, the disclosed cold and hot water collection rings can be used. Corresponding end shields can be produced as required by means of 3D printing processes or they can be alternatively equipped with pipelines located outside the casing.
[0030] FIG. 6 shows a section through the electric motor and the power electronics 2 with axial coolant channels 12, some in the motor casing 15 and/or some in the motor feet 16 and/or some in the electronics casing 2. The production of such coolant channels is producible in a simple and cost-effective manner; moreover, very good thermal coupling of regions to be cooled is realized.
[0031] FIG. 7 shows a section through the electric motor and the power electronics 2 with axial coolant channels 12, some in the motor casing 15 and/or some in the electronics casing 2. In this case, the cooling can also be undertaken at points where it appears specifically necessary. Therefore, for example, a control electronics module may not particularly need to be cooled, whereas a power electronic module may require particular cooling.
[0032] FIG. 8 shows a section through the electric motor and the power electronics 2 with axial coolant channels 12 in the stator 13 of the motor. It goes without saying that combinations of the illustrated arrangements can also be envisaged. The cooling of the stator, motor casing, end shields and electronic modules can be provided and combined accordingly, depending on requirements.
LIST OF REFERENCE SIGNS
[0033] 1 Electric motor [0034] 2 Power electronics [0035] 3 Pump casing [0036] 4 End shield [0037] 5 Pressure side [0038] 6 Suction side [0039] 7 Supply line [0040] 8 Return line [0041] 9 Cold water collection ring [0042] 10 Hot water collection ring [0043] 11 Spiral coolant channel [0044] 12 Axial coolant channel [0045] 13 Stator [0046] 14 Rotor [0047] 15 Motor casing [0048] 16 Motor feet
