EP2995818A1 - Rotationspumpe, system mit der pumpe und zugehöriges betriebsverfahren - Google Patents

Rotationspumpe, system mit der pumpe und zugehöriges betriebsverfahren Download PDF

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Publication number
EP2995818A1
EP2995818A1 EP15185278.7A EP15185278A EP2995818A1 EP 2995818 A1 EP2995818 A1 EP 2995818A1 EP 15185278 A EP15185278 A EP 15185278A EP 2995818 A1 EP2995818 A1 EP 2995818A1
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EP
European Patent Office
Prior art keywords
pump
heating device
temperature sensor
engine
temperatures
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
Application number
EP15185278.7A
Other languages
English (en)
French (fr)
Other versions
EP2995818B1 (de
Inventor
Leonardo Cadeddu
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.)
VHIT SpA
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VHIT SpA
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Publication date
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Publication of EP2995818A1 publication Critical patent/EP2995818A1/de
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Publication of EP2995818B1 publication Critical patent/EP2995818B1/de
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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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/70—Safety, emergency conditions or requirements
    • F04C2270/701—Cold start
    • 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
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum

Definitions

  • the present invention generally relates to a rotary pump for fluids
  • the present invention relates to a single-vane vacuum pump, to which reference will preferably be made hereinbelow.
  • Rotary pumps for instance single-vane or multiple-vane vacuum pumps applied in internal combustion engines for operating servo-brakes or other services in a vehicle, are well known.
  • Such pumps generally consist of a structure including a one-way exhaust valve, which is so dimensioned as to ensure discharge of the pumped fluid.
  • a known problem of such pumps is that, in certain critical situations, such as at low temperatures of pump operation and/or start, the discharge valve generally is not sufficient for discharging the very dense fluid present in the pump in the above conditions, with a consequent hydraulic lock of the pump, a strong increase in the pump resistant torque and possible seizure or breaking of the pump and/or the pump vane.
  • the discharge valve as well the pump structure are dimensioned by taking into account the critical situations instead of the normal operating conditions of the pump.
  • the Applicant has noticed that the prior art generally fails to effectively solve the problem of the increase in the resistant torque in the critical situations without over-dimensioning in some manner the pump discharge valve, the pump components and/or the structure of the pump itself.
  • the present invention also concerns a system comprising the pump and an operating method of the system comprising the pump according to the invention.
  • the rotary pump internally has a heating element arranged to heat, in use, very dense fluid present in the pump.
  • the heating element is located in the vicinity of devices arranged to make the fluid present in the pump discharge.
  • the pump is applied to an internal combustion engine and the heating element is included in a heating device arranged to be controlled by a control unit depending on ambient temperature values and/or engine temperature values.
  • a rotary pump 101 for instance a single-vane vacuum pump, made in accordance with the present invention.
  • Pump 101 includes a body 20 internally having a rotor 11 where a vane 12 slides, which vane is arranged to suck a fluid from at least one inlet or suction port 14, to compress the fluid and/or to discharge it, in known manner, through pump outlet devices 41 arranged to safely discharge the fluid.
  • outlet devices 41 include an outlet passage 104 controlled by a non-return valve, known per se, and a drain 51, controlled by a valve 105 for protection against counter-rotation, known per se.
  • outlet passage 104 and drain 51 are formed in a discharge chamber 103, provided in a predetermined position in outlet devices 41 of pump 101.
  • pump 101 includes at least one heating device 102, e.g. a glow plug 102, at least partly inserted into pump body 20.
  • the heating device has at least one heating element 21 at a first end and a terminal 23 at a second end, which terminal, in use, is electrically connected to a control unit 111, arranged to activate or deactivate the heating of plug heating element 21 for short periods.
  • Heating device 102 is for instance a glow plug of the kind used in Diesel engines in order to start the engine.
  • heating element 21 of the glow plug is inserted into pump body 20 and consequently in the vicinity of discharge chamber 103 of pump 101.
  • heating element 21 of glow plug 102 is located in the vicinity of discharge chamber 103 or, in any case, in the vicinity of outlet passage 104 and drain 51.
  • the pump is installed for instance in an internal combustion engine and has discharge chamber 103 or, in any case, outlet passage 104, drain 51 and glow plug heating element 21 in its lower portion.
  • lower portion is used to indicate that, preferably, heating of the pump insider is performed in a region or "lower portion” where it is more likely that fluid, for instance oil, accumulates, for instance due to gravity force, when the pump is not operating.
  • the pump in use, is a structure closed by a lid 106 ( Fig. 2 ) that, preferably, leaves terminal 23 for the electrical connection of glow plug 102 to control unit 111 accessible.
  • system 10 includes a control device 109, of a known type, arranged for instance at least to control the switching on or off of the engine, and temperature sensors 108, also of known type, arranged to detect, for instance, both the temperature of engine 112 in which pump 101 is mounted, and the ambient temperature.
  • control device 109 of a known type, arranged for instance at least to control the switching on or off of the engine
  • temperature sensors 108 also of known type, arranged to detect, for instance, both the temperature of engine 112 in which pump 101 is mounted, and the ambient temperature.
  • control device 109 has an own internal clock 110 and has, for instance, its input connected to temperature sensors 108 and its output connected to control unit 111.
  • System 10 as described is arranged to enable turning on heating element 21 of glow plug 102 based on temperature readings carried out by control device 109 by means of the temperature sensors and on consequent commands for switching on glow plug 102, transmitted through control unit 111.
  • temperature sensors 108 transmit information concerning the external temperature to control device 109
  • clock 110 transmits information concerning inactivity time periods of engine 112 to the control device.
  • control device 109 is set to command activation of the heating of heating element 21 of glow plug 102 for a predetermined activation time period, for instance a few seconds.
  • control device 109 when the engine is turned on, control device 109 is set to command activation of the heating of glow plug 102 for a predetermined time period depending only on the ambient temperature and/or the engine temperature.
  • turning on of control unit 111, and hence activation of the heating of glow plug 102 can be carried out, for a given reading and check of the ambient and engine temperatures, for instance upon recognition of a signal indicating the opening of a vehicle door or of the engine ignition command by control device 109.
  • activation of the heating of glow plug 102 is carried out in continuous or pulsed manner with a time advance, for instance by some seconds, with respect to the actual engine ignition, depending on the pump installation characteristics.
  • such a time advance may for instance coincide, or be in phase, with the preheating of the ignition glow plugs.
  • such a time advance may be a predetermined time period, for instance a short time advance by some seconds, or a time period determined as a function of temperature ranges detected by the ambient temperature sensor and/or the engine temperature sensor.
  • the system as described is preferably applicable to single-vane vacuum pumps in which engine oil residues are present in the pump after the engine has been turned off.
  • system is also applicable to multiple-vane vacuum pumps as well as to oil pumps.
  • the system according to the invention is capable of ensuring that oil residues present in the pump after the engine has been turned off are made so fluid as under the normal operating conditions of the engine.
  • the Applicant has noticed that the pressures that can occur in prior art pumps when the engine is turned on can be even 10 times higher than the pressures existing under normal operating conditions of the engine, whereby the pump components and the pump structure have to be dimensioned accordingly.
EP15185278.7A 2014-09-15 2015-09-15 Rotationspumpe, system mit der pumpe und zugehöriges betriebsverfahren Active EP2995818B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20140722 2014-09-15

Publications (2)

Publication Number Publication Date
EP2995818A1 true EP2995818A1 (de) 2016-03-16
EP2995818B1 EP2995818B1 (de) 2018-03-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15185278.7A Active EP2995818B1 (de) 2014-09-15 2015-09-15 Rotationspumpe, system mit der pumpe und zugehöriges betriebsverfahren

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EP (1) EP2995818B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107355367A (zh) * 2017-09-07 2017-11-17 绵阳富临精工机械股份有限公司 一种具有单向阀的电子真空泵
DE102016217418A1 (de) 2016-09-13 2018-03-15 Leybold Gmbh Vakuumpumpe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2216930A1 (de) * 1972-04-08 1973-10-18 Brand Fa Rudolf vorrichtung fuer vakuumpumpen zur reduzierung ihres antriebsbedarfes
GB2430474A (en) * 2003-06-14 2007-03-28 Dana Automotive Ltd Lubrication system
WO2010025799A2 (de) 2008-09-05 2010-03-11 Ixetic Hückeswagen Gmbh Vakuumpumpe
US20110008194A1 (en) * 2009-07-09 2011-01-13 Viking Pump, Inc. Electric Heating and Temperature Control for Process Pumps
JP2012061950A (ja) * 2010-09-16 2012-03-29 Hitachi Automotive Systems Ltd パワーステアリング装置及び推力発生装置
US20130201316A1 (en) * 2012-01-09 2013-08-08 May Patents Ltd. System and method for server based control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2216930A1 (de) * 1972-04-08 1973-10-18 Brand Fa Rudolf vorrichtung fuer vakuumpumpen zur reduzierung ihres antriebsbedarfes
GB2430474A (en) * 2003-06-14 2007-03-28 Dana Automotive Ltd Lubrication system
WO2010025799A2 (de) 2008-09-05 2010-03-11 Ixetic Hückeswagen Gmbh Vakuumpumpe
US20110008194A1 (en) * 2009-07-09 2011-01-13 Viking Pump, Inc. Electric Heating and Temperature Control for Process Pumps
JP2012061950A (ja) * 2010-09-16 2012-03-29 Hitachi Automotive Systems Ltd パワーステアリング装置及び推力発生装置
US20130201316A1 (en) * 2012-01-09 2013-08-08 May Patents Ltd. System and method for server based control

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016217418A1 (de) 2016-09-13 2018-03-15 Leybold Gmbh Vakuumpumpe
WO2018050545A1 (de) * 2016-09-13 2018-03-22 Leybold Gmbh Vakuumpumpe
CN107355367A (zh) * 2017-09-07 2017-11-17 绵阳富临精工机械股份有限公司 一种具有单向阀的电子真空泵

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