EP2805035A1 - Kühlanordnung für einen ventilsitz - Google Patents

Kühlanordnung für einen ventilsitz

Info

Publication number
EP2805035A1
EP2805035A1 EP13702078.0A EP13702078A EP2805035A1 EP 2805035 A1 EP2805035 A1 EP 2805035A1 EP 13702078 A EP13702078 A EP 13702078A EP 2805035 A1 EP2805035 A1 EP 2805035A1
Authority
EP
European Patent Office
Prior art keywords
duct
cylinder head
cooling
seat insert
connecting pipe
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
EP13702078.0A
Other languages
English (en)
French (fr)
Other versions
EP2805035B1 (de
Inventor
Daniele GRANÀ
Giorgio LUCAS
Vincenzo LATTANZIO
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.)
Wartsila Finland Oy
Original Assignee
Wartsila Finland Oy
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 Wartsila Finland Oy filed Critical Wartsila Finland Oy
Publication of EP2805035A1 publication Critical patent/EP2805035A1/de
Application granted granted Critical
Publication of EP2805035B1 publication Critical patent/EP2805035B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F01P3/00—Liquid cooling
    • F01P3/12—Arrangements for cooling other engine or machine parts
    • F01P3/14—Arrangements for cooling other engine or machine parts for cooling intake or exhaust valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/12—Cooling of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/12—Cooling of valves
    • F01L3/16—Cooling of valves by means of a fluid flowing through or along valve, e.g. air
    • F01L3/18—Liquid cooling of valve

Definitions

  • the present invention relates to a cooling arrangement for a valve seat of a piston engine in accordance with the preamble of claim 1.
  • the task of the cylinder head is to close the upper end of the cylinder sleeve and form the upper part of the combustion chamber.
  • the cylinder head accommodates inlet and exhaust passages for the gases of the combustion process and pro- vides a base for the valve gear and in a diesel engine for the fuel injection valve.
  • the cylinder head is also provided with cooling ducts for cooling the components that require cooling.
  • One of the components in the cylinder head that needs to be cooled is the exhaust valve seat insert, i.e. the counter surface for the exhaust valve disc, which surface is subject to high thermal loading. If the seat insert heats up excessively, it may develop permanent deformations causing leakage in the exhaust valve.
  • the cooling ducts in the cylinder head may be arranged as close to the seat insert as possible, or a separate cooling duct for cooling liquid may be adapted in conjunc- tion with the seat insert.
  • Problems related to this kind of solutions include insufficient cooling effect and cooling liquid leakages.
  • the cooling duct is arranged between the inlet port and the outlet port so that it extends at least almost around the whole seat insert.
  • a remaining problem is the sealing between the seat insert and the cooling ducts of the cylinder head. Leakages are normally prevented by applying liquid sealant to the joints between the cooling ducts of the cylinder head and the seat insert. When the sealant hardens, it seals the joints between the parts. The liquid sealant works for some time, but after longer use of the engine leakages often occur.
  • the object of the present invention is to provide an improved cooling arrangement for a valve seat of a piston engine.
  • the characterizing features of the cooling arrangement according to the present invention are given in the characterizing part of claim 1.
  • the cooling arrangement comprises a cylinder head comprising an inlet duct and an outlet duct for cooling liquid, and a valve seat insert, which seat insert is arranged against the cylinder head and comprises a cooling duct, an inlet port that is arranged on the outer circumference of the seat insert and in fluid communication with the inlet duct of the cylinder head for conveying cooling liquid into the cooling duct, and an outlet port that is arranged on the outer circumference of the seat insert and in fluid communication with the outlet duct of the cylinder head for discharging cooling liquid out of the cooling duct.
  • the arrangement further comprises at least one connecting pipe that is arranged inside the inlet duct or the outlet duct of the cylinder head and against the seat insert, and a seal that is arranged between the connecting pipe and the seat insert.
  • cooling arrangement With the cooling arrangement according to the invention, leakages from the valve seat cooling system can be prevented.
  • the arrangement is more reliable than conventional cooling systems, where joints between the cylinder head and the seat insert are sealed with liquid sealant. When the seal is damaged, it can be easily replaced. Also existing cooling arrangements can be upgraded with an arrangement according to the invention.
  • the arrangement comprises a second seal that is arranged between the connecting pipe and the inlet or outlet duct of the cylinder head.
  • the second seal prevents leakages between the connecting pipe and the cylinder head.
  • additional seals could be arranged between the connecting pipe and a separate locking pipe and between the locking pipe and the cylinder head.
  • the connecting pipe is provided with a screw thread on the outer surface of the pipe for fastening the connecting pipe to the inlet or outlet duct of the cylinder head. With the thread the connecting pipe can be easily fastened and removed.
  • the arrangement comprises a locking pipe that is provided with a screw thread on the outer surface of the pipe for fastening the locking pipe to the inlet or outlet duct of the cylinder head and for clamping the connecting pipe between the locking pipe and the seat insert.
  • the locking pipe can replace the thread of the connecting pipe.
  • Fig. 1 shows a cylinder head of a piston engine.
  • Fig. 2 shows a cross-sectional view of part of the cylinder head of Fig. 1 taken along line A-A.
  • Fig. 3 shows a cross-sectional view of part of the cylinder head of Fig. 1 taken along line B-B.
  • Fig. 4 shows an enlarged view of detail C in Figs. 2 and 3.
  • Fig. 5 shows a valve seat insert
  • Fig. 6 shows a connecting pipe for a cooling arrangement according to the invention.
  • Fig. 7 shows a locking pipe for a cooling arrangement according to the invention.
  • Figure 1 shows a cylinder head 1 of a large internal combustion engine.
  • the engine is a four-stroke piston engine, which can be used, for instance, as a main or an auxiliary engine of a ship or an engine that is used at a power plant for producing electricity.
  • the task of the cylinder head 1 is to close the upper end of the cylinder sleeve and form the upper part of the combustion chamber of the cylinder.
  • the cylinder head 1 is provided with an inlet passage and an exhaust passage for the gases of the cylinder's combustion process. The gas flow through the inlet passage and the exhaust passage is controlled by valves that are arranged in conjunction with the passages.
  • the cylinder head 1 also acts as a base for the valve gear and in a diesel engine for the fuel injection valve.
  • Each cylinder of the engine is provided with two intake valves and two exhaust valves.
  • the gas exchange valves comprise a valve stem and a valve disc that co- operates with a valve seat.
  • the exhaust valve seats have a high thermal load and are therefore provided with a cooling arrangement.
  • the cooling arrangement comprises a valve seat insert 2 shown in figure 5.
  • the seat insert 2 comprises an annular cooling duct 10 (not shown in Fig. 5) that is arranged completely inside the seat insert 2.
  • the cooling duct 10 is provided with an inlet port 11 for conveying cooling liquid into the cooling duct 10 and with an outlet port 12 for discharging the cooling liquid out of the cooling duct 10.
  • the inlet port 11 and the outlet port 12 are arranged on the outer circumference of the seat insert 2.
  • the cooling duct 10 is arranged between the inlet port 11 and the outlet port 12 so that it extends almost around the whole seat insert 2.
  • the seat insert 2 is a one-piece part, for instance a one-piece cast, which is manufactured by casting.
  • the seat insert 2 may be manufactured by using a powder metallurgical manufacturing method, for instance hot isostatic pressing (HIP).
  • Cooling liquid is supplied through the inlet port 11 into the cooling duct 10.
  • the cooling liquid circulates in the cooling duct 10 almost around the whole seat insert 2 and is then discharged from the cooling duct 10 through the outlet port 12.
  • the seat insert 2 is attached to the cylinder head 1 by a shrinkage fit.
  • the cylinder head 1 is provided with an inlet duct 8 for supplying cooling liquid to the seat insert 2 and with an outlet duct 9 for discharging cooling liquid from the seat insert 2.
  • the inlet duct 8 and the outlet duct 9 can be accessed by removing a plug 4 at the end of the duct 8, 9.
  • the inlet port 11 of the seat insert 1 is aligned with the inlet duct 8 of the cylinder head 1 and the outlet port 12 of the seat insert 2 is aligned with the outlet duct of the cylinder head 1.
  • a connecting pipe 3 is used for improving sealing between the cylinder head 1 and the seat insert 2.
  • the connecting pipe 3 is shown in figure 6.
  • FIG. 2 to 4 is shown a cross-sectional view of the connecting pipe 3.
  • Both the inlet duct 8 and the outlet duct 9 of the cylinder head 1 are provided with a connecting pipe 3.
  • a seal 6 is arranged between the inlet port 11 of the seat insert 2 and the connecting pipe 3.
  • An identical seal 6 is arranged between the outlet port 12 of the seat insert 2 and the connecting pipe 3.
  • the seal 6 is between the end of the connecting pipe 3 and the respective inlet or outlet port 11, 12.
  • the seal 6 prevents leaking between the seat insert 2 and the connecting pipe 3.
  • An annular groove 13 is arranged on the outer surface of the connecting pipe 3 for accommodating a sealing ring 7.
  • the sealing ring 7 prevents leaking between the connecting pipe 3 and the cylinder head 1.
  • the connecting pipe 3 is provided with a screw thread 14 that is arranged on the outer surface of the pipe 3. A similar thread is arranged in the inlet or outlet duct 8, 9 of the cylinder head 1.
  • the connect- ing pipe 3 is provided with a hexagon socket head 16.
  • the connecting pipe 3 can thus be fastened and removed by using a hex wrench (Allen key). It is also possible to use other socket shapes.
  • the arrangement can be provided with a locking pipe 5.
  • the locking pipe 5 is similar to the connecting pipe 3 and is arranged in the inlet or outlet duct 8, 9 of the cylinder head 1.
  • the connecting pipe 3 is clamped between the seat insert 2 and the locking pipe 5.
  • a screw thread 15 is arranged on the outer surface of the locking pipe 5 for fastening the locking pipe 5 to the cylinder head 1.
  • a similar thread is arranged in the inlet or outlet duct 8, 9 of the cylinder head 1.
  • the thread 15 of the locking pipe 5 is oriented in the opposite direction compared to the thread 14 of the connecting pipe 3.
  • the connecting pipe 3 is provided with a right-hand thread
  • the locking pipe 5 is provided with a left- hand thread. If the connecting pipe 3 starts to turn open, it will tighten the locking pipe 5 and loosening of the pipes 3, 5 is prevented.
  • the locking pipe 5 is provided with a hexagon socket head 17 for fastening the pipe 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Lift Valve (AREA)
EP13702078.0A 2012-01-18 2013-01-10 Kühlanordnung für einen ventilsitz Active EP2805035B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20125059A FI124012B (en) 2012-01-18 2012-01-18 Valve seat cooling arrangement
PCT/FI2013/050020 WO2013107928A1 (en) 2012-01-18 2013-01-10 Cooling arrangement for valve seat

Publications (2)

Publication Number Publication Date
EP2805035A1 true EP2805035A1 (de) 2014-11-26
EP2805035B1 EP2805035B1 (de) 2016-03-30

Family

ID=47630395

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13702078.0A Active EP2805035B1 (de) 2012-01-18 2013-01-10 Kühlanordnung für einen ventilsitz

Country Status (5)

Country Link
EP (1) EP2805035B1 (de)
KR (1) KR102050610B1 (de)
CN (1) CN104040122B (de)
FI (1) FI124012B (de)
WO (1) WO2013107928A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103993973A (zh) * 2014-04-18 2014-08-20 中国北方发动机研究所(天津) 一种带有排气门座圈冷却水道的气缸盖水腔结构
CN104405467A (zh) * 2014-12-08 2015-03-11 广西玉柴机器股份有限公司 气门座圈的冷却结构
CN108533347A (zh) * 2018-05-03 2018-09-14 哈尔滨工程大学 低速机双密封锥面排气阀

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB668962A (en) * 1949-03-09 1952-03-26 Sulzer Ag Improvements relating to machine parts with inserted valve seats
GB844119A (en) * 1957-07-26 1960-08-10 Sulzer Ag Liquid-cooled cylinder heads for internal combustion engines
GB1068041A (en) * 1963-01-05 1967-05-10 Mirrlees Nat Ltd Improvements in or relating to caged valves for internal combustion engines
CH571154A5 (de) * 1973-10-31 1975-12-31 Sulzer Ag
CH612244A5 (de) * 1976-05-24 1979-07-13 Sulzer Ag
CH614014A5 (de) * 1977-01-28 1979-10-31 Sulzer Ag
CH628399A5 (de) * 1978-05-26 1982-02-26 Sulzer Ag Anordnung zur kuehlung des zylinderdeckels eines viertakt-dieselmotors.
JPS58144655A (ja) * 1982-02-23 1983-08-29 Kawasaki Heavy Ind Ltd きのこ弁装置
JPS59194013A (ja) * 1983-04-20 1984-11-02 Yanmar Diesel Engine Co Ltd 内燃機関の冷却形排気弁シ−トシ−ル方法
DE3412052C2 (de) * 1984-03-31 1987-02-26 Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart Kühlvorrichtung
DE3436732C2 (de) * 1984-10-06 1987-04-02 Märkisches Werk GmbH, 5884 Halver Gekühltes Ventilgehäuse
DE4031083C1 (en) * 1990-10-02 1991-08-22 Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De IC engine cylinder head - incorporates valve seats cooled by heat pipes extending into coolant channels
TWI234606B (en) 2004-01-30 2005-06-21 Kwang Yang Motor Co Structure of cooling water passage of engine cylinder head
FI124071B (fi) 2006-11-14 2014-02-28 Waertsilae Finland Oy Mäntämoottorin venttiilin istukkarengas
DE102008050388B3 (de) * 2008-10-02 2009-10-22 Märkisches Werk GmbH Verfahren zur Reparatur von Schäden eines wassergekühlten Zylinderkopfes bei 4-Takt-Verbrennungsmotoren, sowie Zylinderkopf

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013107928A1 *

Also Published As

Publication number Publication date
KR20140111321A (ko) 2014-09-18
KR102050610B1 (ko) 2019-11-29
EP2805035B1 (de) 2016-03-30
FI124012B (en) 2014-01-31
WO2013107928A1 (en) 2013-07-25
CN104040122A (zh) 2014-09-10
CN104040122B (zh) 2017-03-29
FI20125059L (fi) 2013-07-19

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