EP3967882A1 - Mehrschneckenpumpe für kühlkreisläufe - Google Patents

Mehrschneckenpumpe für kühlkreisläufe Download PDF

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Publication number
EP3967882A1
EP3967882A1 EP21020399.8A EP21020399A EP3967882A1 EP 3967882 A1 EP3967882 A1 EP 3967882A1 EP 21020399 A EP21020399 A EP 21020399A EP 3967882 A1 EP3967882 A1 EP 3967882A1
Authority
EP
European Patent Office
Prior art keywords
screw
pump
drive
screws
pump according
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.)
Pending
Application number
EP21020399.8A
Other languages
English (en)
French (fr)
Inventor
Sergio Metelli
Fabrizio Antonio Fremondi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metelli SpA
Original Assignee
Metelli SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metelli SpA filed Critical Metelli SpA
Publication of EP3967882A1 publication Critical patent/EP3967882A1/de
Pending legal-status Critical Current

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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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • 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
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • 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
    • F04C2/165—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 having more than two rotary pistons with parallel axes
    • 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
    • F04C2240/60—Shafts
    • F04C2240/603—Shafts with internal channels for fluid distribution, e.g. hollow shaft

Definitions

  • the present invention relates to a multi-screw pump for cooling circuits.
  • the present invention relates to a multi-screw, rotary, positive displacement pump for engine and auxiliary cooling circuits installed on vehicles with internal combustion, electric or hybrid engines.
  • centrifugal pumps of the dynamic type mechanically connected to the rotation shaft of the engine. This connection means that said pumps are driven at different speeds, depending on the speed of the drive shaft.
  • performance is strongly influenced by the rotation speed, as well as by the flow rate and head produced; as a result, when the rotation speed varies, they operate with average lower performance than envisaged in the design conditions, usually referring to the operating point of the motor at which maximum power is expressed.
  • a modular rotor assembly for a screw pump is described suitable for handling high pressure, low viscosity fluids without requiring costly and complex counterbalance structures.
  • US 2015/369241 discloses the solution of a screw pump in which the dynamic seal is applied to the pump shaft itself, and in US 2002 081226 the area of the end of a screw rotor driven by the discharge pressure is reduced by separating the suction and discharge pressures by means of a labyrinth seal.
  • EP 1 475 537 discloses a pump equipped with at least three rotors, arranged in a shared housing, in which the rotation of the drive screw causes the rotation of the driven screws and the pressurised fluid is used to drive an actuator; the drive screw is supported by a radial ball bearing, while the driven screws are hydro-dynamically supported. Pumps of this type cannot be used for cooling circuits of engines and auxiliaries installed on vehicles with internal combustion engines.
  • the purpose of the present invention is to overcome the drawbacks complained of above.
  • the aim of the present invention is to provide a circulation pump capable of ensuring performance substantially independent of its rotation speed and of the operating conditions.
  • a further and consequent aim of the invention is to provide a circulation pump capable of allowing an appreciable saving of the mechanical energy needed to drive it, therefore a reduction of CO2 emissions.
  • no less important purpose of the invention is to provide a pump in which friction and wear phenomena that could degrade its performance over time are minimized.
  • a further purpose of the invention is to make available to users a multi-screw pump for cooling circuits suitable to ensure a high level of resistance and reliability over time, in addition such as to be easily and economically made.
  • the multi-screw pump for cooling circuits of the present invention denoted by reference numeral 10 in Figure 1 in which it is shown in its entirety, comprises a pump body 12 in which a plurality of rotors are housed, preferably with hollow screws to lighten the weight of said pump.
  • the rotors are at least three in number and each is provided with a typically and non-critically helical thread; said pump is advantageously predisposed for use in cooling circuits of vehicle engines and/or related auxiliary systems; at least one of the rotors indicated by reference numeral 14 is activated by an electric or other type of motor 18, so that the rotational motion is transferred to the other driven rotors 14'.
  • the motor 18 is housed in a cover container body 18'. In practice, rotating compartments are created which favour the movement of the fluid towards the delivery section or duct, near which the pressurisation of the fluid feeds one or more delivery circuits-(16).
  • the pump 10 is preferably provided with a front mechanical seal 20 with sliding rings, one integral with the pump itself and the other with the rotation shaft 22 of the motor 18, kept in connection by elastic force or by a lip seal to delimit the area lapped by the processed fluid; however, the use of static seals 24, with the same purpose of containing the processed fluid, may also be envisaged.
  • the driven screws are advantageously supported by bearings, sliding bearings, rolling bearings or a combination thereof, so as to avoid seizing and minimize wear phenomena and dissipation due to friction, as well as vibrations and noise; the particular arrangement of the axial constraints, referable to the shoulder 28 ( figure 4 ) of the drive shaft 22 and to the bushings 32 ( figure 2 ), allows the assembly composed of the drive screw or rotor 14 and the driven screws 14' ( figures 2 and 4 ) to be axially floating, which on the one hand, facilitates assembly operations and, on the other, avoids seizures due to thermal expansion.
  • the drive screw 14 is unilaterally constrained towards the drive shaft 22 and the torque transmission is realized by key means 26, while the coaxiality of said drive shaft 22 with respect to the drive screw 14 is realized by means of a cylindrical coupling, as per Figure 4 .
  • the end stop in this position is determined by the contact between the drive screw 14 and the shoulder 28 on the drive shaft 22.
  • the driven screws 14' are also constrained in such direction, given that once inserted in the housing in the presence of the drive screw, their sliding has as end-stroke the contact established between the threads, in particular between the grooves of said driven screws 14' and the corresponding ridges of the drive screw 14.
  • the driven screws 14' do not require axial restraint and the bearings, whether sliding or rolling, are attributable to a carriage restraint.
  • the carriage constraint comprises at least one non-flanged bushing 30 ( fig. 2 ).
  • the stop to the axial sliding in the opposite direction is realized on the driven screws 14' by a generic bearing or equivalent abutment means; in the specific case represented in figure 2 , the carriage constraint is constituted by a flanged bushing 32.
  • the same cover container body 18' is used both to create a seat for at least one bearing 34 of the drive shaft 22, and for the seat of the dynamic seal and bushings 30; this makes it possible to minimize alignment errors between these components.
  • the dynamic seal comprises a front mechanical seal with sliding rings 20, although said dynamic seal may also be of another type, for example formed by a lip seal or the like.
  • the drive screw 14 and the driven screws 14' are preferably hollow ( Fig. 4 ), in order to reduce the weights and inertias of the system.
  • the cavity of the drive screw is a through cavity and connects the two ends of the screw axially, it is possible to create a fluid passage between the suction chamber and the chamber near the seal indicated by reference numeral 39 in figure 3 ; this way it is possible to balance the pressure acting on the dynamic seal, preserving its functionality over time.
  • a screw with a through cavity allows the passage of electrical cables, if necessary, for example to be used for one or more sensors interacting with the electronic control unit on board the vehicle or dedicated.
  • the pump 10 of the invention can be provided with a device for conveying the fluid in suction from the relative duct 16' so as to avoid or reduce the impact on the drive screw 14 and consequently improve the fluid-dynamic performance; this device can be integral with the rotating element or ogive 36 ( fig. 4 ) or the fixed element 41 ( fig. 2 ).
  • the same pump may include two or more delivery points 16 at different pressure levels, which can be achieved by means of one or more intermediate tappings; this type of solution is particularly useful when a single pump is used to supply two circuits having two different purposes; an example in this regard concerns the case of auxiliary services for the first outlet and engine cooling services for the second.
  • control and power electronics are arranged as an on-board circuit on the pump body or, possibly, on or near the electric motor 18, and are advantageously cooled by the processed fluid so as to preserve their operational and functional characteristics.
  • the pump 10 may comprise an on-board overpressure control system, schematically indicated by reference numeral 40 in Figure 3 .
  • the pump of the present invention preferably processes fluids such as solutions of water or glycol in various concentrations, specific fluids for cooling the motor or auxiliary components functional for the thermal requirements of the vehicle, as well as for cooling electrical/electronic components functional for electric, hybrid propulsion or battery energy storage.
  • the multi-screw pump for cooling circuits of the present invention has high performance as the rotation speed and operating conditions vary, thus resulting operationally superior to the dynamic pumps traditionally used in the automotive industry for the circulation of fluids and achieving the result of a lower absorption of mechanical energy; in fact, centrifugal pumps over-accelerate the fluid, the losses increase and, in order to provide the same hydraulic performance, they require more mechanical energy, since the energy losses increase as the speed of the fluid increases.
  • the fact that the seats of the supports of the rotating elements, referred to the bearing 34 of the shaft 22 and to the front mechanical seal 20, are obtained directly on the body 18' of the electric motor 18, in order to avoid/minimize possible positioning errors, is particularly advantageous. Additionally, the positioning of the drive screw 14 and the driven screws 14' is ensured by positioning their respective axes through the bushings 30, 32 and the bearing 34.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
EP21020399.8A 2020-09-09 2021-08-05 Mehrschneckenpumpe für kühlkreisläufe Pending EP3967882A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102020000021280A IT202000021280A1 (it) 2020-09-09 2020-09-09 Pompa a più viti per circuiti di raffreddamento

Publications (1)

Publication Number Publication Date
EP3967882A1 true EP3967882A1 (de) 2022-03-16

Family

ID=73699201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21020399.8A Pending EP3967882A1 (de) 2020-09-09 2021-08-05 Mehrschneckenpumpe für kühlkreisläufe

Country Status (2)

Country Link
EP (1) EP3967882A1 (de)
IT (1) IT202000021280A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115199531A (zh) * 2022-06-17 2022-10-18 安徽凯特泵业有限公司 一种恒温输送泵

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693763A (en) 1951-10-25 1954-11-09 Laval Steam Turbine Co Nonpositive screw pump or motor
GB718238A (en) * 1951-10-25 1954-11-10 Imo Industri Ab Improvements in or relating to screw pumps
US3790309A (en) * 1970-09-08 1974-02-05 Allweiler Ag Unitary pump-motor assembly
US4131400A (en) * 1976-04-27 1978-12-26 Aktiebolaget Imo-Industri Hydraulic rotary screw machine with axial balancing piston
US20020081226A1 (en) 2000-12-26 2002-06-27 Jianping Zhong Thrust load reliever
US6443711B1 (en) 2000-11-14 2002-09-03 Carrier Corporation Inlet bearing lubrication for a screw machine
EP1475537A1 (de) 2003-05-08 2004-11-10 Automotive Motion Technology Limited Schraubenpumpe
CN201574926U (zh) * 2009-11-30 2010-09-08 天津泵业机械集团有限公司 经济型三螺杆泵
US20150369241A1 (en) 2013-03-01 2015-12-24 Netzsch Pumpen & Systeme Gmbh Screw Pump
CN106194719A (zh) * 2016-08-26 2016-12-07 黄山艾肯机械制造有限公司 一种低粘度高压力的螺杆泵
WO2017189022A1 (en) 2016-04-29 2017-11-02 Imo Industries, Inc. Modular thrust-compensating rotor assembly
WO2019072887A1 (de) * 2017-10-12 2019-04-18 Continental Automotive Gmbh Kraftstoffpumpe und kraftstofffördereinheit

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693763A (en) 1951-10-25 1954-11-09 Laval Steam Turbine Co Nonpositive screw pump or motor
GB718238A (en) * 1951-10-25 1954-11-10 Imo Industri Ab Improvements in or relating to screw pumps
US3790309A (en) * 1970-09-08 1974-02-05 Allweiler Ag Unitary pump-motor assembly
US4131400A (en) * 1976-04-27 1978-12-26 Aktiebolaget Imo-Industri Hydraulic rotary screw machine with axial balancing piston
US6443711B1 (en) 2000-11-14 2002-09-03 Carrier Corporation Inlet bearing lubrication for a screw machine
US20020081226A1 (en) 2000-12-26 2002-06-27 Jianping Zhong Thrust load reliever
EP1475537A1 (de) 2003-05-08 2004-11-10 Automotive Motion Technology Limited Schraubenpumpe
CN201574926U (zh) * 2009-11-30 2010-09-08 天津泵业机械集团有限公司 经济型三螺杆泵
US20150369241A1 (en) 2013-03-01 2015-12-24 Netzsch Pumpen & Systeme Gmbh Screw Pump
WO2017189022A1 (en) 2016-04-29 2017-11-02 Imo Industries, Inc. Modular thrust-compensating rotor assembly
CN106194719A (zh) * 2016-08-26 2016-12-07 黄山艾肯机械制造有限公司 一种低粘度高压力的螺杆泵
WO2019072887A1 (de) * 2017-10-12 2019-04-18 Continental Automotive Gmbh Kraftstoffpumpe und kraftstofffördereinheit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115199531A (zh) * 2022-06-17 2022-10-18 安徽凯特泵业有限公司 一种恒温输送泵

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