EP1887197B1 - A generator set - Google Patents

A generator set Download PDF

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Publication number
EP1887197B1
EP1887197B1 EP07113390.4A EP07113390A EP1887197B1 EP 1887197 B1 EP1887197 B1 EP 1887197B1 EP 07113390 A EP07113390 A EP 07113390A EP 1887197 B1 EP1887197 B1 EP 1887197B1
Authority
EP
European Patent Office
Prior art keywords
generator set
fan
endothermic engine
supplementary
sound
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.)
Active
Application number
EP07113390.4A
Other languages
German (de)
French (fr)
Other versions
EP1887197A2 (en
EP1887197B8 (en
EP1887197A3 (en
Inventor
Vanes Sergio Francini
Enrico Paci
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.)
Dometic Sweden AB
Original Assignee
Dometic WTA A Responsabilita' Limitata Soc
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 Dometic WTA A Responsabilita' Limitata Soc filed Critical Dometic WTA A Responsabilita' Limitata Soc
Publication of EP1887197A2 publication Critical patent/EP1887197A2/en
Publication of EP1887197A3 publication Critical patent/EP1887197A3/en
Publication of EP1887197B1 publication Critical patent/EP1887197B1/en
Application granted granted Critical
Publication of EP1887197B8 publication Critical patent/EP1887197B8/en
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Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
    • F02B63/044—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators the engine-generator unit being placed on a frame or in an housing

Definitions

  • the present invention relates to a generator set comprising:
  • the present invention refers to the sector of sound-proofed generator sets, in which the electrical generator and the endothermic engine are boxed within a sound-proofed enclosure.
  • the constructive type of the generator set in question or the alternator
  • the constructive type of the generator set in question is fastened directly on the drive shaft of the endothermic engine (direct transmission), thus being coaxial relative thereto.
  • Known technical solutions for cooling sound-proofed direct transmission generator sets employ a cooling block serving the purpose of conveying cool air (i.e., air drawn from outside the enclosure) on the endothermic engine and on the alternator in axial direction, i.e. in the direction of the drive shaft. In this way, the cooling of the alternator and of the head of the endothermic engine is assured.
  • cool air i.e., air drawn from outside the enclosure
  • said cooling block comprises a fan keyed on the drive shaft and positioned within a case.
  • the case serves the purpose of conveying the air flow generated by the fan, addressing it axially towards the head of the engine.
  • Said case is so shaped as to prevent dispersions of said air flow on the outer surface of the engine or in radial direction.
  • said generator sets define a hollow space, between the endothermic engine and the sound-proofing enclosure, in which is present, disadvantageously, air that is substantially motionless and hot (because it is in contact with the outer surface of the endothermic engine). This entails a limitation with regard to the performance of the generator set.
  • An object of the present invention is to eliminate the aforesaid drawbacks and to make available a sound-proofed, direct transmission generator set with a particularly effective cooling system, able to assure particularly high performance levels.
  • the reference number 1 indicates a generator set according to the present invention.
  • the generator set 1 comprises an endothermic engine 2 with its own drive shaft 3 and an electrical generator 4 connected to said drive shaft 3 and coaxial to the endothermic engine 2.
  • the electrical generator 4 comprises a rotor 5 and a stator 6, according to a known construction type.
  • the rotor 5 is multi-polar with permanent magnets and rotates outside the stator to which it is coaxial.
  • the generator set 1 comprises a cooling fan 7 keyed on the drive shaft 3 and co-operating with a case 8 to define a cooling block 9 conveying cool air axially on the electrical generator 4 and on a head of the endothermic engine 2.
  • the case 8 is substantially constituted by a shell that houses the fan 7 and has an upper opening to enable the fan 7 to aspirate air from above and a lower opening, whose edge is substantially in contact with an upper surface of the endothermic engine 3, i.e. with the surface corresponding to the head of the endothermic engine itself, said upper opening enabling to orient (and concentrate) on said lower surface the air flow generated by the fan 7.
  • the generator set 1 comprises a sound-proofing enclosure 10 containing the endothermic engine 3, the electrical generator 4 and the cooling block 9.
  • Said sound-proofing enclosure 10 is made of sound-absorbing material, such as self-extinguishing polyurethane foam impregnated with inorganic charges.
  • the generator set 1 also comprises, originally, a supplementary fan 11 keyed on the drive shaft 3 and positioned internally to the sound-proofing enclosure 10 and externally to the case 8. Moreover, the generator set 1 originally comprises a conduit 12 positioned internally to the sound-proofing enclosure 10 and co-operating with said supplementary fan 11 to convey a flow of cool air into an air filter 13 of the endothermic engine 2.
  • the generator set 1 further comprises, originally, a supplementary case 14 co-operating with said supplementary fan 1 1 to convey a flow of cool air on an outer surface of the endothermic engine 2.
  • the supplementary fan 11 is positioned inside the sound-proofing enclosure 10 so that the cooling block 9 is interposed between said supplementary fan 11 and the endothermic engine 2.
  • the supplementary fan 11 is positioned above the fan 7 and is coaxial thereto (in particular, the two fans are keyed on the same drive shaft 3).
  • the generator set 1 further comprises a box body 15 housing the air filter, according to a known constructive mode.
  • Said box body 15, originally, defines an opening operatively connected to said conduit 12 to receive the air flow generated by the supplementary fan 11.
  • Said supplementary case 14 in particular, is so shaped as to maximise a forced circulation of cool air in a hollow space defined between the outer surface of the endothermic engine 2 and the sound-proofing enclosure 10.
  • the supplementary fan 11 is able to exert a pressing action in radial direction on the cool air drawn from outside the sound-proofing enclosure 10.
  • the flow of air generated in radial direction by the supplementary fan 11 is then conveyed by the supplementary case 14 so that a first of portion of said flow is channelled into the conduit 12 and a second portion laps the outer surface of the endothermic engine 2 (as shown schematically in figure 6 ).
  • the generator set 1 comprises a voltage rectifier and a voltage inverter (indicated by the reference number 16 in figure 2 ), electrically connected to the electrical generator 4, to assure a voltage output from the electrical generator 4 that is particularly stable in terms of frequency and clean in terms of harmonic distortion.
  • the presence of the supplementary fan 11 enables to increase the total flow of cooling air, in particular substantially to double said flow.
  • the fans 7 and 11 have similar dimensions, because their diameter is limited by the need to limit the bulk of the generator set, and they rotate at the same velocity, i.e. at the velocity of rotation of the drive shaft 3 whereon they are keyed.
  • the supplementary fan 11 enables, in combination with the conduit 12, to implement, originally, a forced ventilation on the air filter of the endothermic engine 2, said forced ventilation being carried out with cool air (cool because it is drawn from outside sound-proofing enclosure 10).
  • the generator set of the present invention allows, thanks to an innovative ventilation system, particularly high performance levels. Moreover, the generator set of the present invention is particularly silent, because it does not comprise supplementary openings defined by the sound-proofing enclosure 10, but rather, the supplementary fan 11 is positioned inside the sound-proofing enclosure 10 itself.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Control Of Eletrric Generators (AREA)

Description

  • The present invention relates to a generator set comprising:
    • an endothermic engine with its own drive shaft;
    • an electrical generator connected to said drive shaft and coaxial to the endothermic engine;
    • a fan keyed on the drive shaft and co-operating with a case to define a cooling block conveying cool air axially on the electrical generator and on a head of the endothermic engine;
    • a sound-proofing enclosure containing the endothermic engine, the electrical generator and the cooling block.
  • The present invention refers to the sector of sound-proofed generator sets, in which the electrical generator and the endothermic engine are boxed within a sound-proofed enclosure. In particular, in the constructive type of the generator set in question (or the alternator) is fastened directly on the drive shaft of the endothermic engine (direct transmission), thus being coaxial relative thereto.
  • For this kind of generator sets, the problem of effectively cooling the endothermic engine is particularly important. To sound-proof the generator set, it is necessary to reduce all spaces around the engine and use, for the enclosure, sound-proofing material, with the consequent limitation of the aeration of the engine and penalisation of its cooling.
  • Known technical solutions for cooling sound-proofed direct transmission generator sets employ a cooling block serving the purpose of conveying cool air (i.e., air drawn from outside the enclosure) on the endothermic engine and on the alternator in axial direction, i.e. in the direction of the drive shaft. In this way, the cooling of the alternator and of the head of the endothermic engine is assured.
  • Such an example is known for example from US4835405 .
  • In particular, said cooling block comprises a fan keyed on the drive shaft and positioned within a case. The case serves the purpose of conveying the air flow generated by the fan, addressing it axially towards the head of the engine. Said case is so shaped as to prevent dispersions of said air flow on the outer surface of the engine or in radial direction.
  • Therefore, said generator sets define a hollow space, between the endothermic engine and the sound-proofing enclosure, in which is present, disadvantageously, air that is substantially motionless and hot (because it is in contact with the outer surface of the endothermic engine). This entails a limitation with regard to the performance of the generator set.
  • An additional disadvantage of known technical solutions is that they do not provide for effective cooling of some critical parts of the endothermic engine, such as in particular the air filter and the oil sump, which, due to sound-proofing needs, are positioned within the sound-proofing enclosure and hence have their heat exchange surfaces in contact with said hollow space.
  • An object of the present invention is to eliminate the aforesaid drawbacks and to make available a sound-proofed, direct transmission generator set with a particularly effective cooling system, able to assure particularly high performance levels.
  • Said object is fully achieved by the generator set of the present invention, which is characterised by the content of the claims set out below.
  • This and other characteristics shall become more readily apparent from the description that follows of a preferred embodiment, illustrated purely by way of non limiting example in the accompanying drawing tables, in which:
    • figure 1 shows a perspective, partially see-through view of a generator set according to the present invention;
    • figure 2 shows a partially open view of the generator set of figure 1;
    • figure 3 shows a portion of the generator set of figure 2;
    • figure 4 shows a partially exploded view of the generator set of figure 3;
    • figure 5 shows a further exploded view of the generator set of figure 4;
    • figure 6 shows the generator set of figure 3, together with a schematic representation of the ventilation flows;
  • In the figures, the reference number 1 indicates a generator set according to the present invention.
  • The generator set 1 comprises an endothermic engine 2 with its own drive shaft 3 and an electrical generator 4 connected to said drive shaft 3 and coaxial to the endothermic engine 2. In particular (with reference to figure 5), the electrical generator 4 comprises a rotor 5 and a stator 6, according to a known construction type. The rotor 5 is multi-polar with permanent magnets and rotates outside the stator to which it is coaxial.
  • Moreover, the generator set 1 comprises a cooling fan 7 keyed on the drive shaft 3 and co-operating with a case 8 to define a cooling block 9 conveying cool air axially on the electrical generator 4 and on a head of the endothermic engine 2. In particular, the case 8 is substantially constituted by a shell that houses the fan 7 and has an upper opening to enable the fan 7 to aspirate air from above and a lower opening, whose edge is substantially in contact with an upper surface of the endothermic engine 3, i.e. with the surface corresponding to the head of the endothermic engine itself, said upper opening enabling to orient (and concentrate) on said lower surface the air flow generated by the fan 7.
  • Moreover, the generator set 1 comprises a sound-proofing enclosure 10 containing the endothermic engine 3, the electrical generator 4 and the cooling block 9. Said sound-proofing enclosure 10 is made of sound-absorbing material, such as self-extinguishing polyurethane foam impregnated with inorganic charges.
  • The generator set 1 also comprises, originally, a supplementary fan 11 keyed on the drive shaft 3 and positioned internally to the sound-proofing enclosure 10 and externally to the case 8. Moreover, the generator set 1 originally comprises a conduit 12 positioned internally to the sound-proofing enclosure 10 and co-operating with said supplementary fan 11 to convey a flow of cool air into an air filter 13 of the endothermic engine 2.
  • The generator set 1 further comprises, originally, a supplementary case 14 co-operating with said supplementary fan 1 1 to convey a flow of cool air on an outer surface of the endothermic engine 2.
  • It should be noted that the supplementary fan 11 is positioned inside the sound-proofing enclosure 10 so that the cooling block 9 is interposed between said supplementary fan 11 and the endothermic engine 2. In practice the supplementary fan 11 is positioned above the fan 7 and is coaxial thereto (in particular, the two fans are keyed on the same drive shaft 3).
  • The generator set 1 further comprises a box body 15 housing the air filter, according to a known constructive mode. Said box body 15, originally, defines an opening operatively connected to said conduit 12 to receive the air flow generated by the supplementary fan 11.
  • Said supplementary case 14, in particular, is so shaped as to maximise a forced circulation of cool air in a hollow space defined between the outer surface of the endothermic engine 2 and the sound-proofing enclosure 10.
  • In this regard, it should be noted that, under operating conditions, in said hollow space, in the absence of said forced circulation (obtained originally thanks to the supplementary fan 11 and to the supplementary case 14, appropriately shaped), there would be substantially motionless, hot air (i.e. at a temperature of about 60°C whilst inside the case 8 the air typically has a temperature of 40 ÷ 45°C (considering a temperature of 30 ÷ 35°C for cool air, i.e. the air present outside the sound-proofing enclosure 10).
  • In the preferred embodiment, illustrated herein, the supplementary fan 11 is able to exert a pressing action in radial direction on the cool air drawn from outside the sound-proofing enclosure 10. The flow of air generated in radial direction by the supplementary fan 11 is then conveyed by the supplementary case 14 so that a first of portion of said flow is channelled into the conduit 12 and a second portion laps the outer surface of the endothermic engine 2 (as shown schematically in figure 6).
  • It should also be noted that the generator set 1 comprises a voltage rectifier and a voltage inverter (indicated by the reference number 16 in figure 2), electrically connected to the electrical generator 4, to assure a voltage output from the electrical generator 4 that is particularly stable in terms of frequency and clean in terms of harmonic distortion.
  • It should also be noted that the presence of the supplementary fan 11 enables to increase the total flow of cooling air, in particular substantially to double said flow. The fans 7 and 11 have similar dimensions, because their diameter is limited by the need to limit the bulk of the generator set, and they rotate at the same velocity, i.e. at the velocity of rotation of the drive shaft 3 whereon they are keyed.
  • Moreover, the supplementary fan 11 enables, in combination with the conduit 12, to implement, originally, a forced ventilation on the air filter of the endothermic engine 2, said forced ventilation being carried out with cool air (cool because it is drawn from outside sound-proofing enclosure 10).
  • Therefore, the generator set of the present invention allows, thanks to an innovative ventilation system, particularly high performance levels. Moreover, the generator set of the present invention is particularly silent, because it does not comprise supplementary openings defined by the sound-proofing enclosure 10, but rather, the supplementary fan 11 is positioned inside the sound-proofing enclosure 10 itself.

Claims (6)

  1. Generator set (1) comprising:
    - an endothermic engine (2) with its own drive shaft (3);
    - an electrical generator (4) connected to said drive shaft (3) and coaxial to the endothermic engine (2);
    - a first fan (7) keyed on the drive shaft (3) and co-operating with a case (8) to define a cooling block (9) conveying cool air axially on the electrical generator (4) and on a head of the endothermic engine (2);
    - a sound-proofing enclosure (10) containing the endothermic engine (2), the electrical generator (4) and the cooling block (9);;
    wherein the electrical generator (4) is interposed between the cooling block (9) and the endothermic engine (2), wherein the generator set (1) comprises a supplementary fan (11);
    wherein the supplementary fan (11) is keyed on the drive shaft (3) and positioned within the sound-proofing enclosure (10) and outside said case (8) in such a way that the cooling block (9) is interposed between said supplementary fan (11) and the endothermic engine (2),
    the generator set (1) comprises a conduit (12) positioned inside the sound-proofing enclosure (10) and co-operating with said supplementary fan (11) to convey a flow of cool air into an air filter (13) of the endothermic engine (2), and
    the generator set (1) comprises a supplementary case (14) co-operating with said supplementary fan (11) to convey a flow of cool air on an outer surface of the endothermic engine (2).
  2. A generator set as claimed in claim 1, wherein the supplementary fan (11) is coaxial to the first fan (7) of the cooling block (9).
  3. A generator set as claimed in claim 1, comprising a box body (15) housing the air filter (13) and defining an opening operatively connected to said conduit (12).
  4. A generator said as claimed in claim 1, wherein said supplementary case (14) is so shaped as to maximize a forced circulation of cool air in a hollow space defined between said outer surface of the endothermic engine (2) and the sound-proofing enclosure (10).
  5. A generator set as claimed in claim 1, wherein said supplementary fan (11) is able to exercise a pressing action in radial direction on the cool air drawn from outside the sound-proofing enclosure (10).
  6. A generator set as claimed in claim 1, comprising a voltage rectifier and a voltage inverter (16), electrically connected to the electrical generator (4).
EP07113390.4A 2006-08-04 2007-07-30 A generator set Active EP1887197B8 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITPR20060076 ITPR20060076A1 (en) 2006-08-04 2006-08-04 GENERATOR GROUP

Publications (4)

Publication Number Publication Date
EP1887197A2 EP1887197A2 (en) 2008-02-13
EP1887197A3 EP1887197A3 (en) 2010-03-10
EP1887197B1 true EP1887197B1 (en) 2018-10-17
EP1887197B8 EP1887197B8 (en) 2019-03-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07113390.4A Active EP1887197B8 (en) 2006-08-04 2007-07-30 A generator set

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EP (1) EP1887197B8 (en)
IT (1) ITPR20060076A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11591977B2 (en) 2020-06-03 2023-02-28 Briggs & Stratton, Llc Inverter generator

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US8890340B2 (en) * 2011-11-04 2014-11-18 Kohler, Inc. Fan configuration for an engine driven generator
US8544425B2 (en) 2011-11-04 2013-10-01 Kohler Co. Engine driven generator that is cooled by a first electrical fan and a second electrical fan
US8881694B2 (en) 2011-12-12 2014-11-11 Cummins Power Generation Ip, Inc. Generator set assembly with baffle
US8872361B2 (en) 2012-01-25 2014-10-28 Briggs & Stratton Corporation Standby generators including compressed fiberglass components
CN102926897B (en) * 2012-11-29 2015-06-10 南车戚墅堰机车有限公司 Multifunctional air filtering box
US9404417B2 (en) 2012-11-30 2016-08-02 Cummins Power Generation, Inc. Noise attenuation compartment with heat exchanger arrangements for engines driving a load
US10744586B2 (en) 2017-11-28 2020-08-18 Lincoln Global, Inc. Engine driven welder
US10786859B2 (en) 2017-11-28 2020-09-29 Lincoln Global, Inc. Engine driven welder
US11705779B2 (en) 2020-06-03 2023-07-18 Briggs & Stratton, Llc Inverter generator
CN115726881A (en) * 2021-09-01 2023-03-03 福建润达动力机械有限公司 Vehicle-mounted generator set capable of adapting to outdoor high-low temperature environment

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US4835405A (en) * 1987-11-30 1989-05-30 Onan Corporation Generator set and method
JPH02155447A (en) * 1988-12-06 1990-06-14 Kubota Ltd Cooler for forcibly air-cooled vertical shaft type engine generator
US5624589A (en) * 1995-09-11 1997-04-29 Illinois Tool Works Inc. Segregated cooling air flow for engine driven welder
DE10245418B4 (en) * 2002-09-28 2018-05-09 Andreas Stihl Ag & Co. blower assembly
DE102004047855A1 (en) * 2004-10-01 2006-04-20 Daimlerchrysler Ag Air sucking arrangement for use in radiator of truck, has pure air conduit for sucking engine air, where conduit runs in sections in range of radiator and is implemented together with chassis of fan guard

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11591977B2 (en) 2020-06-03 2023-02-28 Briggs & Stratton, Llc Inverter generator

Also Published As

Publication number Publication date
EP1887197A2 (en) 2008-02-13
ITPR20060076A1 (en) 2008-02-05
EP1887197B8 (en) 2019-03-20
EP1887197A3 (en) 2010-03-10

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