EP4460638A1 - Kühlmittelpumpe für den kühlkreislauf eines fahrzeugs - Google Patents
Kühlmittelpumpe für den kühlkreislauf eines fahrzeugsInfo
- Publication number
- EP4460638A1 EP4460638A1 EP22700134.4A EP22700134A EP4460638A1 EP 4460638 A1 EP4460638 A1 EP 4460638A1 EP 22700134 A EP22700134 A EP 22700134A EP 4460638 A1 EP4460638 A1 EP 4460638A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electronics
- coolant
- pump
- chamber
- pump head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5813—Cooling the control unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
- F04D13/0613—Special connection between the rotor compartments
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/043—Shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/60—Shafts
- F05D2240/61—Hollow
Definitions
- the invention relates to a coolant pump for the cooling circuit of a vehicle with an electric motor which has a stator and a rotor which is connected to a drive shaft, a pump head in which a coolant inlet, a coolant outlet and a delivery channel are formed, an impeller which is connected to the is connected to the drive shaft and is arranged rotatably in the pump head, a can, which separates a rotor chamber, which is fluidically connected to the delivery channel and in which the rotor and the drive shaft are arranged, from a stator chamber in which the stator is arranged, an electronics chamber , which is arranged on a side of the electric motor that is axially opposite to the pump head and in which an electronics unit is arranged, which has power electronics.
- Such coolant pumps are used to circulate the coolant in a coolant circuit and can be used both in vehicles with internal combustion engines and in battery-powered vehicles or hybrid vehicles or fuel cell vehicles in order to ensure adequate cooling of the heat-producing components.
- CN 208128083 U discloses a cooling water pump which is driven by a canned motor.
- the cooling water enters the rotor chamber through openings in the A end shield, flows around the rotor and reaches a cooling water chamber on the opposite side of the rotor to the impeller.
- This cooling water space is separated from an electronics space by a B end shield, which is also cooled accordingly.
- the coolant reaches the back of a hollow shaft that carries the impeller, so that the cooling water flows from here back through the hollow shaft to the suction side of the pump.
- the disadvantage is that dead spaces can form in the cooling water space behind the rotor, which have a low flow rate, as a result of which different amounts of heat are dissipated from different areas of the electronics space. This can lead to overheating of the power electronics, where a particularly large amount of heat is generated.
- the object is therefore to provide a coolant pump that ensures that a sufficient amount of heat is reliably dissipated, especially from areas of the electronics in which large amounts of heat are generated, in order to prevent overheating of the power electronics in particular.
- the coolant pump according to the invention for the cooling circuit of a vehicle has an electric motor which, in particular, can be used electronically commutated DC motor is designed and has a stator with windings and a rotor with permanent magnets, which is connected to a drive shaft, in particular by pressing or gluing on the drive shaft.
- An impeller is attached to one end of the shaft to generate a pressure drop when the drive shaft rotates with the impeller.
- This impeller is rotatably arranged in a pump head, into which coolant flows via a mostly axial coolant inlet into the impeller, or flows between the conveyor blades of the impeller and from there is conveyed into a particularly spiral-shaped conveying channel surrounding the impeller, from which it flows to a coolant outlet , which extends in particular tangentially from the delivery channel to the outside of the pump head.
- the coolant pump has a can that has a rotor chamber that is fluidically connected to the delivery channel, for example via one or more channels that can be formed on the side of the impeller on the A end shield that is opposite to the inlet, and in which the Rotor and the drive shaft are arranged, opposite a stator space in which the stator is arranged separates.
- coolant flows into the rotor chamber, as a result of which the windings of the stator are cooled.
- An electronics compartment of the electric motor is arranged on the side of the pump head opposite the pump head and accommodates an electronics unit which, for example, has a printed circuit board with various electronic components.
- This electronics unit includes power electronics, in particular an IGBT module, which generates a lot of heat during operation.
- the rotor chamber is fluidically connected to an electronics cooling chamber, which is axially separated from the electronics chamber by a wall, with a coolant channel extending from a side of the electronics cooling chamber that is directly axially opposite to the power electronics, at the end of which facing the electronics chamber there is a lower pressure than at the opposite end .
- the coolant channel branches off from the area of the electronics cooling chamber opposite the power electronics.
- the coolant duct extending from precisely this area of the electronics cooling chamber opposite the power electronics, in which there is a pressure gradient, ensures that the coolant is discharged from the electronics cooling chamber, since a forced flow through this region of the electronics cooling chamber is produced by the pressure gradient in the duct extending from it.
- the drive shaft is preferably designed as a hollow shaft with an inner channel which is fluidically connected to the electronics cooling chamber via the coolant channel, the inner channel opening out at the coolant inlet of the pump head.
- the pressure drop in the coolant channel is realized by connecting the coolant channel to the suction side of the pump via the inner channel of the hollow shaft. A circuit of the coolant is created in the pump in which dead spaces are prevented, especially in the area of the power electronics.
- the coolant duct initially opens into a cooling space which is formed axially between the hollow shaft and the wall delimiting the electronics space, the cooling space being fluidically connected directly and exclusively via the one coolant duct to the electronics cooling chamber.
- the cooling space being fluidically connected directly and exclusively via the one coolant duct to the electronics cooling chamber.
- a further improvement in heat dissipation is produced in that the power electronics have a delimiting housing surface which rests on the wall separating the electronics space from the electronics cooling chamber. This large contact area results in good heat transfer to the separating wall and thus also to the coolant.
- the cooling chamber for the electronics is preferably of ring-shaped design, so that the most complete possible contact is made with the separating wall radially outside the bearing receptacle, and heat can thus be dissipated uniformly from the entire electronics space.
- the ring-shaped electronics cooling chamber has an expansion in the area axially opposite the power electronics, so that it can be ensured that the entire area opposite the power electronics is also actively cooled.
- the bearing plate is understood to mean a housing part which, on the one hand, accommodates the bearing of the electric motor and, on the other hand, forms an axial boundary.
- the end shield removed from the pump head is often referred to as the B end shield and the end shield placed on the pump head as the A end shield.
- the coolant channel connecting the electronics space to the inner channel of the hollow shaft is formed in the end shield remote from the pump head. This can be implemented, for example, by simply drilling a hole. Additional components to be mounted can thus be omitted.
- the electronics cooling chamber is delimited by the end shield removed from the pump head and the can. Accordingly, only one seal has to be provided for reliable sealing. This makes assembly easier.
- annular projection of the split tube lies radially against an annular projection of the bearing plate remote from the pump head, with a sealing ring being interposed.
- an end shield of the electric motor that delimits the pump head is designed in one piece with a housing that radially delimits the electric motor and the electronics space.
- the stator, the front bearing, the can and the rotor with the shaft can be pushed into this housing.
- the pump head and the B end shield can also be mounted directly on this part of the housing.
- the bearing plate delimiting the pump head preferably has an annular projection, against which an axially extending annular section is reduced with the interposition of a second sealing ring diameter of the split tube. This means that the can can also be sealed and assembled to the end shield on this side by simply pushing it in.
- At least one connecting channel is advantageously formed in the end shield delimiting the pump head, via which connecting channel the delivery channel is connected to the rotor space.
- This connection can be made with a simple drill hole. Due to the pressure in the delivery channel, the coolant is also pressed to the rear of the impeller and from here into the rotor chamber, in which the pressure is lower than in the delivery channel, so that there is a driving pressure gradient, through which the flow through the rotor chamber and thus the Cooling of the stator and subsequently the electronics unit is ensured.
- a coolant pump for the cooling circuit of a vehicle is thus made available, which is simple and inexpensive to manufacture and assemble and at the same time reliably cools the heat-generating components. In particular, it is ensured that there is sufficient heat dissipation from the power electronics area.
- the figure shows a side view of a coolant pump according to the invention in a sectional representation.
- the coolant pump according to the invention has a pump head 10 designed as a spiral housing, which has an axially extending, central coolant inlet 12 and a coolant outlet 16 extending tangentially from a spiral-shaped delivery channel 14.
- a rotatable impeller 18 is arranged in the pump head 10, via which the Coolant is conveyed from the coolant inlet 12 via the conveying channel 14 to the coolant outlet 16 .
- the pump head 10 and the delivery channel 14 are delimited by a first bearing plate 20 .
- This first bearing plate 20 has a central bearing seat 22 in which a first bearing 24 is arranged, which supports a drive shaft 26 designed as a hollow shaft, on the end of which the impeller 18 is fastened.
- the first bearing plate 20 is formed in one piece with an outer housing 28 which extends axially from the radially outer region of the bearing plate 20 in the opposite direction to the pump head 10 and completely surrounds an electric motor 30 .
- the pump head 10 has a radially outer, annular section 32 extending axially to the housing 28, which is pushed over the end shield 20 or the housing 28 with the interposition of a sealing ring 34, which is arranged in a radial groove 36 of the housing 28, and there is attached.
- the electric motor 30 consists of a stator 38 which has a laminated core 40 on the teeth of which support elements 42 are pushed which support windings 44 of the stator 38 .
- the stator 38 is fixed to the inner wall of the housing 28 .
- a rotor 46 is formed in the radial interior of the stator 38, which carries permanent magnets 48 and which is fastened to the drive shaft 26, so that the rotor 46 is rotated with the drive shaft 26 when the windings 44 of the stator 38 are energized accordingly, causing a rotation of the Impeller 18 and a promotion of the coolant is generated.
- the drive shaft 26 is mounted on its side facing away from the pump head 10 in a second bearing 50 which is fastened in a bearing seat 52 of a second bearing plate 54 .
- the second bearing plate 54 limits the electric motor 30 to the
- Pump head 10 opposite side axially and is located radially on the inside Inner wall of the housing 28, which extends beyond the second bearing plate 54 and also radially surrounds an electronics space 56, which is closed axially by a cover 58 with the interposition of a further sealing ring 60.
- An electronics unit 62 is arranged in the interior of this electronics space 56 , which consists of a printed circuit board 64 and electronic components 66 arranged thereon for controlling the electric motor 30 .
- the electronic modules 66 have, among other things, power electronics 68, that is to say power transistors, which are combined in an IGBT module, for example.
- the coolant is guided up to a wall 70 which separates the electronics space 56 from a rotor space 72 formed beyond the wall 70 .
- this wall 70 is formed by the second end shield 54 .
- the rotor space 72 is the area of the electric motor 30 in which the rotor 46 and the drive shaft 26 are arranged.
- This rotor chamber 72 is separated by a can 74 from a radially outer stator chamber 76 in which the stator 38 is arranged in order to prevent the coolant from reaching the windings 44 which are sensitive to corrosion.
- the second end shield 54 has an annular projection 78 which extends axially in the direction of the stator 38 and on whose radially inner side a sealing ring 80 is arranged, which in turn has its inner side against an annular to the second bearing plate 54 pointing annular projection 82 of the can 74 rests.
- the projection 78 of the second end shield 54 rests axially against a wall surface of the can 74 that extends radially along the end of the stator 38 .
- the split tube 74 On the side facing the pump head 10, the split tube 74 has an axially extending, annular section 84 of reduced diameter, which surrounds the first bearing seat 22 of the first bearing plate 20 and on the radial outside of which another sealing ring 86 is arranged, the outside of which faces against a projection 88 of the first bearing plate 20 which extends axially to the rotor space 72 .
- the rotor chamber 72 is delimited by the two end shields 20, 54 and the can 74.
- axial connecting channels 90 are formed radially adjacent to the bearing mount 22, via which a space 92 between the impeller 18 and the bearing plate 20 and thus the delivery channel 14 is fluidly connected to the rotor space 72, so that coolant can flow into the rotor space 72 . There the coolant flows around the rotor 46 and reaches the area between the rotor 46 and the second end shield 54.
- annular electronics cooling chamber 94 in the second end shield 54, which is separated from the electronics space 56 only by the wall 70, which is made as thin as possible in this area.
- This essentially ring-shaped electronics cooling chamber 94 extends radially inward from the ring-shaped projection 78 of the second end shield 54 .
- a coolant duct 96 branches off radially inwards from an area of the electronics cooling chamber 94, which is arranged directly opposite the power electronics 68 in relation to the wall 70 of the second bearing plate 54, and opens into a cooling space 98, which is located axially between the drive shaft 26 and the end shield 54 is formed.
- This cooling chamber 98 thus borders directly on an inner channel 100 of the drive shaft 26 designed as a hollow shaft, which opens out at the coolant inlet 12 of the pump head 10, so that in Coolant channel there is a driving pressure drop in the direction of the cooling chamber.
- the ring-shaped electronics cooling chamber 94 has a radial expansion 102 in the area opposite the power electronics 68 in order to increase the directly effective cooling surface. Furthermore, the cooling effect is increased by a delimiting housing surface 104 of the power electronics 68 lying against the wall 70 of the second end shield 54, so that a good heat transfer from the power electronics 68 to the wall 70 is produced and this heat is dissipated via the contacting coolant can.
- the pump can also be manufactured with a solid shaft and the cooling chamber can be dispensed with.
- the coolant could also be discharged to other positions via the coolant duct, as long as the branching occurs from the space immediately behind the power electronics and there is a driving pressure drop in the coolant duct.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2022/050244 WO2023131409A1 (de) | 2022-01-07 | 2022-01-07 | Kühlmittelpumpe für den kühlkreislauf eines fahrzeugs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4460638A1 true EP4460638A1 (de) | 2024-11-13 |
Family
ID=80112363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22700134.4A Withdrawn EP4460638A1 (de) | 2022-01-07 | 2022-01-07 | Kühlmittelpumpe für den kühlkreislauf eines fahrzeugs |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP4460638A1 (de) |
| WO (1) | WO2023131409A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102023212607A1 (de) | 2023-12-13 | 2025-06-18 | Robert Bosch Gesellschaft mit beschränkter Haftung | Elektrische Antriebseinheit und ein Verfahren zum Betreiben einer solchen |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5997261A (en) * | 1997-10-31 | 1999-12-07 | Siemens Canada Limited | Pump motor having fluid cooling system |
| KR101905270B1 (ko) * | 2016-11-14 | 2018-10-05 | 명화공업주식회사 | 워터펌프 |
| CN208128083U (zh) | 2018-05-02 | 2018-11-20 | 常州市东南电器电机股份有限公司 | 一种电子水泵的驱动电路板的散热结构 |
| CN208982367U (zh) * | 2018-06-01 | 2019-06-14 | 崇玮工业股份有限公司 | 双冷却式电子水泵 |
| CN112833024A (zh) * | 2019-11-22 | 2021-05-25 | 盾安汽车热管理科技有限公司 | 电子水泵 |
| CN113137376A (zh) * | 2021-06-03 | 2021-07-20 | 江苏朗信电气有限公司 | 一种大功率电子水泵 |
-
2022
- 2022-01-07 WO PCT/EP2022/050244 patent/WO2023131409A1/de not_active Ceased
- 2022-01-07 EP EP22700134.4A patent/EP4460638A1/de not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023131409A1 (de) | 2023-07-13 |
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