EP3924624A1 - Electrical screw spindle coolant pump - Google Patents
Electrical screw spindle coolant pumpInfo
- Publication number
- EP3924624A1 EP3924624A1 EP19817281.9A EP19817281A EP3924624A1 EP 3924624 A1 EP3924624 A1 EP 3924624A1 EP 19817281 A EP19817281 A EP 19817281A EP 3924624 A1 EP3924624 A1 EP 3924624A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spindle
- motor
- housing
- chamber
- electric
- 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.)
- Granted
Links
- 239000002826 coolant Substances 0.000 title claims abstract description 36
- 238000012546 transfer Methods 0.000 claims description 26
- 239000007788 liquid Substances 0.000 abstract description 15
- 230000010512 thermal transition Effects 0.000 abstract 2
- 239000000446 fuel Substances 0.000 description 13
- 238000001816 cooling Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 238000012356 Product development Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0096—Heating; Cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
- F04C29/047—Cooling of electronic devices installed inside the pump housing, e.g. inverters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/40—Electric motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
- F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine
Definitions
- the present invention relates to an electric coolant pump of the type of a screw spindle pump for conveying a coolant circuit or the like, in particular for conveying corrosive, liquid media.
- Screw pumps are positive displacement pumps that enable high pressures and high volumetric efficiency. They do not offer any speed-independent adjustment of the geometry, but they have a robust rotary piston mechanism that is insensitive to contamination and does not require any filigree elements such as gate valves or the like.
- mechanically driven screw pumps have so far mainly been used in large-scale applications, such as Oil pumps in stationary systems or ship engines, in which they run at relatively constant operating points.
- US 2018/0216614 Al describes a screw pump that is intended as a fuel pump.
- a Cover attached with an axial outlet.
- the electric motor is accommodated in an outlet chamber of the cover and the fuel flows through it before it leaves the outlet.
- DE 10 2015 101 443 B3 describes a fuel pump with a housing in which an electric drive motor is coupled to a screw pump. The fuel flows through the drive motor before it leaves the outlet on the pressure side.
- WO 2014/138519 A1 discloses an electric fluid pump of the screw spindle type.
- the liquid flowing through an inlet and an outlet also surrounds the motor.
- a fuel is named as a liquid.
- a flange plane which is shown in the construction shown between a housing part on the motor side and a housing part on the pump side, runs between the motor and an outlet on the pump side.
- DE 10 2017 210 771 A1 shows an electrically driven screw pump as a fuel delivery unit.
- a pump housing and an electric motor are accommodated in a jacket.
- the electrical components of the motor are in direct contact with the fuel within an outlet guide on a pressure side of the spindle chamber.
- No. 6,371,744 B1 describes an electrical vacuum pump of the screw spindle type.
- the screw spindles are driven by an electric motor which is arranged in a separate housing. Irrespective of specific modifications between a screw pump for gases and a screw pump for liquids, the said vacuum pump would not be transferable to an application as an electric coolant pump. With the arrangement shown, sufficient cooling of a dry-running electric motor could not be ensured.
- a setpoint temperature of a coolant can be in the range of the boiling point of the coolant. In this case, overheating damage to electrical or electronic components would occur in continuous operation.
- an object of the present invention is to create an electric screw pump that is suitable for pumping corrosive, liquid media and a cooling of the electrical drive provides.
- Another aspect of the task is to provide a corresponding technical solution in such a way that it can also be implemented cost-effectively in series production of large numbers.
- the electrical screw spindle coolant pump according to the invention for conveying a coolant circuit is particularly characterized in that a motor housing comprises a motor chamber in which a dry-running electric motor is arranged so as to be delimited from the conveying flow; and that the motor housing has a heat transfer section through which the delivery stream flows and which is arranged between the motor chamber and a component boundary of the motor housing to a spindle housing.
- the invention provides for the first time a screw spindle pump as a coolant pump. Furthermore, the invention provides for the first time a screw spindle pump as an electric liquid pump that is driven by a dry-running electric motor.
- the invention provides for the first time a screw spindle pump as an electric liquid pump in which a convection-assisted heat transfer is provided from a dry motor chamber to a conveying flow of the liquid conveying medium.
- the present invention creates a coolant pump with a high power density.
- the screw pump creates the high delivery pressure of a positive displacement pump, albeit with a relatively low pulsation, similar to a centrifugal pump.
- the screw pump enables universal installations and applications.
- the electric screw spindle coolant pump according to the invention is suitable, for example, for use in electric, especially battery electric vehicles in which no mechanical drive source is provided and a branched structure of thin or capillary cooling channels in a battery module or a traction motor requires a high delivery pressure.
- the invention is based on the principle of moving an axial position of a component boundary between a motor housing and a spindle housing from a conventional functional position further in the direction of the spindle chamber.
- this creates an area that is protected from the liquid in the delivery flow, so that the electric drive is not exposed to any corrosive influences.
- a liquid-conducting area on the motor housing is created by the heat transfer section, which increases an internal thermal contact surface with the coolant. Via a heat exchange on the resulting thermal contact surface of the heat-conducting motor housing and a convection of the flow rate, even with a small temperature difference between the electric drive and the coolant, waste heat from electrical power loss can be effectively removed from the pump.
- the enlargement of the thermal contact surface is achieved without a higher complexity of the structure, such as in the form of surface-enlarging structures, flow resistances or the like.
- the motor housing is designed as a cast part in product development.
- the changed component boundary can be implemented on the pump structure according to the invention without any significant effort or increase in production costs. Due to a complementary relocation of the component boundary of the spindle housing, there is essentially no disadvantageous increase in the overall dimensions of the pump in spite of an enlarged axial dimension of the motor housing.
- the heat transfer section can further comprise the pump outlet.
- the flow cross-section of the entire delivery flow is guided past the motor chamber.
- the inner surface of the pump outlet on the heat transfer section increases the thermal contact surface of the thermally conductive motor housing with the flow rate again considerably.
- the heat transfer section can comprise a delivery flow chamber which establishes a connection between the frontal delimitation of the motor chamber and the spindle chamber.
- the heat transfer section can comprise a bearing seat for a shaft bearing, which is arranged between the electric motor and the screw spindles.
- the surface of the bearing seat in the heat transfer section in turn increases the thermal contact area of the thermally conductive motor housing with the flow rate.
- the integration of a shaft bearing in the axial area of the heat transfer section favors a compact design of the pump.
- electronics for the electric motor can also be arranged in the motor chamber. Accordingly, a further heat source is included in the cooling of the electric drive according to the invention. In this way, the power loss from power electronics is also dissipated via the conveyor stream.
- a stator and / or electronics of the electric motor in the motor housing can be in contact with an end delimitation of the motor chamber. This ensures that the heat transfer path of the thermally conductive motor housing is as short as possible between the electrical heat sources in the motor chamber and the delivery flow.
- the heat transfer section can be formed in one piece with the motor housing. This ensures an optimized heat transfer path without interfaces or joints in the material and the lowest possible manufacturing costs for the motor housing.
- the spindle housing can be designed in one piece. As explained above, the relocation of the component boundary between the motor housing and the spindle housing creates an open cross section of the spindle chamber. As a result, no division into two halves of the housing is required either for the assembly of the pump or for the manufacture of the molded body of the spindle housing.
- the one-piece design of the spindle housing ensures a joint-free inner contour of the spindle chamber without the need for reworking. The inner contour of the spindle chamber can be produced easily and precisely by drilling.
- the spindle housing can comprise the pump inlet.
- the spindle housing is designed as a cast part during product development. Accordingly, by integrating the pump inlet, the number of components of the pump structure according to the invention can be reduced without significant effort.
- a flange connection from a flange section of the motor housing and a flange section of the spindle housing can be formed at the component boundary between the motor housing and the spindle housing.
- the flange connection enables a preferred screw connection for assembling the two housing components, while a corresponding flange also allows different types of sealing.
- Fig. 1 shows a schematic sectional view through a screw spindle coolant pump according to an embodiment of the invention.
- screw pump is understood to mean helical rotary piston pumps with a thread pitch for displacing the delivery medium.
- Such types of pumps generally include a driven screw spindle 2a and at least one further screw spindle 2b, which is dragged along by engagement of the toothing.
- a driven screw spindle 2a and a dragged screw spindle 2b are rotatably supported in a spindle chamber 10 of the spindle housing 1 in a spindle housing 1.
- the spindle chamber 10 has a cross-sectional contour in the form of a so-called figure eight housing, ie it is formed by two bores in the pump housing 1, the radii of which overlap in order to ensure engagement of the screw spindles 2a, 2b.
- the driven screw spindle 2a is connected to an electric motor 4.
- a rotary movement of engaging screw profiles of the rotating screw spindles 2a, 2b generates a negative pressure on the suction side of the spindle chamber 10 and an overpressure on the opposite pressure side of the spindle chamber 10.
- the delivery medium is conveyed by a continuous displacement along a screw pitch of the engaged screw profiles and is expelled from the spindle chamber 10 through the pump outlet 13.
- a motor housing 3 adjoins the spindle housing on the pressure side of the spindle chamber 10.
- the motor housing 3 has a flange section 35 which is designed to match a flange section 15 of the spindle housing 1.
- the flange connection is sealed by a seal.
- a separate motor chamber 30 is formed in the motor housing 3, in which the dry-running electric motor 4 and electronics, in particular power electronics (not shown) for switching the electrical power to the electric motor 4, are accommodated.
- An open one The end of the motor chamber 30 is closed off by a motor cover (not shown).
- a collar-shaped bearing seat 32 with a passage opening is formed in an end-side delimitation of the motor chamber 30.
- a common shaft bearing 23 of the electric motor 4 and the driven screw spindle 2a is fitted in the bearing seat 32.
- a shaft seal 34 is fitted into the bearing seat 32, which seals the motor chamber 30 from the entry of liquid.
- the dry-running electric motor 4 is an internal rotor type having an internal rotor 42 and an external stator 4L.
- the rotor 42 is coupled to the driven screw spindle 2a.
- the stator 41 comprises field coils that are controlled by the power electronics and supplied with electrical power.
- the stator 41 of the electric motor 4 is in thermal contact with an inner circumferential surface and with an end-side boundary surface of the motor chamber 30 so that waste heat from the field coils of the stator 41 is transferred to the motor housing 3.
- the motor housing 3 consists of a metallic material with good thermal conductivity, such as a cast aluminum alloy, and is designed as a one-piece molded part.
- a heat transfer section 31 of the motor housing 3 extends.
- the pump outlet 13 is arranged in the form of a radially discharging pressure connection between the motor chamber 30 and the spindle chamber 10.
- a delivery flow chamber 33 through which the liquid delivery medium flows. The delivery flow chamber 33 establishes a connection between the pressure side of the spindle chamber 10 and the pump outlet 13 for the delivery flow of the pump.
- the conveying flow chamber 33 surrounds the collar-shaped bearing seat 32 and guides the pressurized, liquid conveying medium to the front boundary of the motor chamber 30, with which the stator 41 is in thermal contact.
- the heat transfer section 31 represents that region of the thermally conductive material volume on the motor housing 3 which is significantly involved in the dissipation of waste heat from the motor chamber 30 into the delivery flow.
- the inner surface of the pump outlet 13, the inner surface of the delivery flow chamber 33 and the surface of the bearing seat 32 each contribute to an increase in the thermal contact area between the motor chamber 30 and the delivery flow within the
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019103470.1A DE102019103470A1 (en) | 2019-02-12 | 2019-02-12 | Electric screw spindle coolant pump |
PCT/EP2019/084161 WO2020164776A1 (en) | 2019-02-12 | 2019-12-09 | Electrical screw spindle coolant pump |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3924624A1 true EP3924624A1 (en) | 2021-12-22 |
EP3924624B1 EP3924624B1 (en) | 2023-04-19 |
Family
ID=68835242
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19817281.9A Active EP3924624B1 (en) | 2019-02-12 | 2019-12-09 | Electrical screw spindle coolant pump |
Country Status (6)
Country | Link |
---|---|
US (1) | US20220099088A1 (en) |
EP (1) | EP3924624B1 (en) |
CN (1) | CN113227580B (en) |
BR (1) | BR112021012370A2 (en) |
DE (1) | DE102019103470A1 (en) |
WO (1) | WO2020164776A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019118086A1 (en) * | 2019-07-04 | 2021-01-07 | Nidec Gpm Gmbh | Integrated screw spindle coolant pump |
DE102019118094A1 (en) * | 2019-07-04 | 2021-01-07 | Nidec Gpm Gmbh | Temperature control device for a battery storage module |
IT202100019787A1 (en) | 2021-07-26 | 2023-01-26 | Fluid O Tech Srl | IMPROVED SCREW PUMP, ESPECIALLY FOR COOLING SYSTEMS. |
DE102021133106A1 (en) * | 2021-12-14 | 2023-06-15 | Leistritz Pumpen Gmbh | screw pump |
DE102021133099A1 (en) * | 2021-12-14 | 2023-06-15 | Leistritz Pumpen Gmbh | screw pump |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3245973A1 (en) * | 1982-12-11 | 1984-06-14 | Allweiler Ag, 7760 Radolfzell | ENGINE PUMP UNIT |
FR2544459B1 (en) * | 1983-04-14 | 1987-04-30 | Zimmern Bernard | METHOD FOR LUBRICATING THE BEARINGS OF A COMPRESSOR, AND REFRIGERATION COMPRESSOR USING THE SAME |
US5222874A (en) * | 1991-01-09 | 1993-06-29 | Sullair Corporation | Lubricant cooled electric drive motor for a compressor |
DE19745616A1 (en) * | 1997-10-10 | 1999-04-15 | Leybold Vakuum Gmbh | Cooling system for helical vacuum pump |
WO1999049220A1 (en) * | 1998-03-23 | 1999-09-30 | Taiko Kikai Industries Co., Ltd. | Dry vacuum pump |
JP2002522696A (en) * | 1998-08-06 | 2002-07-23 | オートモウティヴ、モウシャン、テクノラジ、リミティド | Motor driven pump |
BE1013944A3 (en) * | 2001-03-06 | 2003-01-14 | Atlas Copco Airpower Nv | Water injected screw compressor. |
DE102005025816B4 (en) * | 2005-06-02 | 2010-06-02 | Joh. Heinr. Bornemann Gmbh | Screw Pump |
CN101265900A (en) * | 2008-04-23 | 2008-09-17 | 王法荣 | Shielded electric pump |
CN102099583A (en) * | 2008-07-18 | 2011-06-15 | 拉尔夫·斯蒂芬斯 | Cooling for a screw pump |
JP5334801B2 (en) * | 2009-11-04 | 2013-11-06 | 株式会社神戸製鋼所 | Two-stage screw compressor and refrigeration system |
CN101975160B (en) * | 2010-11-16 | 2014-12-03 | 上海维尔泰克螺杆机械有限公司 | Double-screw liquid pump |
CN201991766U (en) * | 2011-03-30 | 2011-09-28 | 上海沪石石油机械有限公司 | Three-screw oil delivery pump |
BE1020311A3 (en) * | 2012-02-28 | 2013-07-02 | Atlas Copco Airpower Nv | SCREW COMPRESSOR. |
WO2014138519A1 (en) | 2013-03-07 | 2014-09-12 | Ti Group Automotive Systems, L.L.C. | Coupling element for a screw pump |
DE102015101443B3 (en) | 2015-02-02 | 2016-05-12 | Leistritz Pumpen Gmbh | Fuel pump |
JP2017048695A (en) | 2015-08-31 | 2017-03-09 | 株式会社デンソー | Screw pump |
BE1023508B1 (en) * | 2015-10-07 | 2017-04-11 | Atlas Copco Airpower, N.V. | Method for installing a transmission and shaft seal applied thereby |
JP6692725B2 (en) * | 2016-09-08 | 2020-05-13 | 株式会社神戸製鋼所 | Oil-free screw compressor |
DE102017210771B4 (en) | 2017-06-27 | 2019-05-29 | Continental Automotive Gmbh | Screw pump, fuel delivery unit and fuel delivery unit |
-
2019
- 2019-02-12 DE DE102019103470.1A patent/DE102019103470A1/en not_active Ceased
- 2019-12-09 WO PCT/EP2019/084161 patent/WO2020164776A1/en unknown
- 2019-12-09 CN CN201980085411.6A patent/CN113227580B/en active Active
- 2019-12-09 BR BR112021012370-9A patent/BR112021012370A2/en not_active Application Discontinuation
- 2019-12-09 US US17/428,582 patent/US20220099088A1/en not_active Abandoned
- 2019-12-09 EP EP19817281.9A patent/EP3924624B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3924624B1 (en) | 2023-04-19 |
WO2020164776A1 (en) | 2020-08-20 |
CN113227580B (en) | 2023-06-27 |
CN113227580A (en) | 2021-08-06 |
DE102019103470A1 (en) | 2020-08-13 |
US20220099088A1 (en) | 2022-03-31 |
BR112021012370A2 (en) | 2021-08-31 |
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