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DE-102024210823-A1 - Electric pump, coolant circuit and vehicle

DE102024210823A1DE 102024210823 A1DE102024210823 A1DE 102024210823A1DE-102024210823-A1

Abstract

The invention relates to a pump (100) for conveying a liquid from a suction side (101) to a pressure side (102) of the pump (100), wherein the pump (100) has an electric drive comprising a stator (110) and a rotor (120) which is mechanically connected to a conveying unit (125), wherein at least one heat conducting element (140, 145) is arranged along at least one surface of the stator (110), which is configured to absorb heat from the stator (110) and/or at least one further component of the pump (100), in particular a power electronics (130) serving to energize the stator, and to transfer it to the liquid conveyed by the pump (100).

Inventors

  • STEPHAN KOHLER
  • Sebastian Hansen
  • Johannes Walter
  • Georg Reeb
  • Ewgenij Landes

Assignees

  • Robert Bosch Gesellschaft mit beschränkter Haftung

Dates

Publication Date
20260513
Application Date
20241112

Claims (12)

  1. Pump (100) for conveying a liquid from a suction side (101) to a pressure side (102) of the pump (100), wherein the pump (100) has an electric drive comprising a stator (110) and a rotor (120) mechanically connected to a conveying mechanism (125), wherein at least one heat conducting element (140, 145) is arranged along at least one surface of the stator (110), which is configured to dissipate heat from the stator (110) and/or at least one other surface of the stator (125). to receive the fluid from the pump component (100), in particular a power electronics (130) used to supply current to the stator, and to deliver it to the fluid pumped by the pump (100).
  2. Pump (100) after Claim 1 , wherein the at least one heat conducting element (140, 145) is in thermal contact with the pressure side (102) of the pump (100), and/or is at least partially arranged on a surface (151, 152) of the pump (100) that defines a wet room (103) of the pump (100) and/or on a surface (114) of the stator (110) facing away from the rotor (120).
  3. Pump (100) after Claim 1 or 2 , wherein the stator (110) is arranged in a dry chamber (104) of the pump (100) and the rotor (120) is arranged in a wet chamber (103) of the pump (100), wherein the dry chamber (104) is not flushed by the liquid and the wet chamber (103) is at least partially flushed by the liquid.
  4. Pump (100) according to one of the preceding claims, wherein the at least one heat conducting element (140, 145) has a surface-enhancing structure (142) at least in a region designed to transfer heat from the stator (110) to the at least one heat conducting element (140, 145), and/or in a region designed to transfer heat from the at least one heat conducting element (140, 145) to the liquid, and/or in a region designed to transfer heat from the at least one further component to the at least one heat conducting element (140, 145).
  5. Pump (100) according to one of the preceding claims, wherein the at least one heat conducting element (140, 145) comprises at least one stamped and bent part and/or at least one deep-drawn part and/or at least one sheet metal part and/or die-cast part.
  6. Pump (100) according to one of the preceding claims, wherein the at least one heat conducting element (140, 145) comprises at least one metal, in particular one or more from the group comprising aluminium, iron and copper and their alloys.
  7. Pump (100) according to one of the preceding claims, wherein the at least one heat conducting element (140, 145) has at least one housing (140) receiving the stator (110) and/or a cover (145) at least partially closing an opening in the housing (140).
  8. Pump (100) according to one of the preceding claims, wherein the stator (110) together with the at least one heat conducting element (140, 145) is at least partially embedded in an electrically insulating solid (150).
  9. Pump (100) after Claim 8 , wherein an axle (170) supporting the rotor (110) is at least partially embedded in the electrically insulating solid (150).
  10. Pump (100) after Claim 8 or 9 , wherein the electrically insulating solid (150) has a higher thermal conductivity than air, and/or wherein the electrically insulating solid (150) comprises one or more of the group comprising a thermoplastic polymer, a thermosetting polymer and a ceramic material.
  11. Coolant circuit comprising a coolant and at least one pump (100) according to one of the preceding claims, wherein the at least one pump (100) is configured to pump the coolant in the coolant circuit.
  12. Vehicle, in particular at least partially electrically powered vehicle, with a coolant circuit according to Claim 11 and/or at least one pump (100) after one of the Claims 1 until 10 .

Description

The present invention relates to a pump with an electric drive, a coolant circuit, and a vehicle with such a pump. Background of the invention Electrically driven coolant pumps can be used in partially (such as hybrid) and fully electric vehicles. Depending on the system design, several pumps can be installed for different cooling circuits with varying flow rates and temperature requirements. At the same time, the pumps should be as small as possible while still being able to handle large flow rates. This presents the challenge that waste heat cannot be efficiently dissipated in the small installation space at higher power outputs, because, among other things, the efficiency of a pump typically decreases significantly at high flow rates. Since the pumps are sometimes installed in such a way that cooling the electronics (circuit board) and/or the stator via the pump's outer housing is insufficient, further, more complex (active) cooling measures may be necessary. Disclosure of the invention According to the invention, a pump with an electric drive, a coolant circuit, and a vehicle with such a pump, comprising the features of the independent claims, are proposed. Advantageous embodiments are the subject of the dependent claims and the following description. The invention provides a pump for conveying a liquid from a suction side to a discharge side of the pump with an electric drive. The electric drive comprises a stator and a rotor, which is mechanically connected to or forms part of a conveying mechanism. At least one heat-conducting element is arranged along at least one surface of the stator. This element is configured to absorb heat from the stator and/or from at least one other component of the pump, in particular power electronics used to supply current to the stator, and to transfer it to the liquid conveyed by the pump. This efficiently dissipates heat generated by electrical losses in the stator or the at least one other component without requiring separate cooling. Furthermore, leakage currents of the conveyed liquid from the discharge side of the pump back to the suction side ("hydraulic short circuit"), which are conventionally used to cool the stator, can be reduced or preferably eliminated entirely without impairing the cooling of the stator or the other component(s). This significantly increases efficiency compared to conventional pumps. For example, in conventional pumps, these (deliberately planned) leakage flows can account for up to 30% of the pumped fluid volume, whereas in embodiments of the invention, these leakage flows are reduced or eliminated entirely. Furthermore, dissipating the heat into the fluid being pumped offers the advantage that, especially at high flow rates and thus high thermal loads, a high cooling capacity is automatically available due to the high volume flow of the pumped medium used for cooling. In particular, a pump housing that is conventionally designed for heat dissipation, which is costly in its construction, can be designed more economically without sacrificing efficient heat dissipation. Moreover, the pump can be positioned, installed, and operated independently of external installation conditions, e.g., in vehicles. According to at least one embodiment, the stator, together with the at least one heat-conducting element, is at least partially embedded in an electrically insulating solid, e.g., by injection molding. According to at least one embodiment, the electrically insulating solid has a higher thermal conductivity than air. According to at least one embodiment, the electrically insulating solid comprises one or more materials from the group consisting of a thermoplastic, a thermosetting plastic, and a ceramic material. For example, the stator with the at least one heat-conducting element can be encapsulated in a plastic matrix, which has a particularly advantageous effect on the electrical and thermal properties. In particular, this allows the wet chamber to be separated from the dry chamber without an additional component (no additional seals) and simultaneously optimizes the heat transfer between the stator and the heat-conducting element, since thermally insulating air layers are displaced by plastic, which enables more effective heat transport. According to at least one embodiment, the at least one heat-conducting element is in thermal contact with the pressure side or a pressure-side fluid channel of the pump. This allows for efficient use of design features without increasing the pump's installation space. As already mentioned, heat dissipation into a pressure-side fluid channel results in cooling capacity that increases with increasing flow rate (and thus...). (increasing heat output of the pump) increases and thus automatically adjusts to the demand. According to at least one embodiment, the at least one heat-conducting element is arranged at least partially on a surface of the pump that borders the wet chamber and/or on a surface of the stator