CN108590874A - A kind of marine low speed diesel engine piston comprising cooling device - Google Patents

A kind of marine low speed diesel engine piston comprising cooling device Download PDF

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Publication number
CN108590874A
CN108590874A CN201810532493.1A CN201810532493A CN108590874A CN 108590874 A CN108590874 A CN 108590874A CN 201810532493 A CN201810532493 A CN 201810532493A CN 108590874 A CN108590874 A CN 108590874A
Authority
CN
China
Prior art keywords
cooling
heat pipe
piston
cooling device
cylinder
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
CN201810532493.1A
Other languages
Chinese (zh)
Inventor
王贵新
吴文涛
李晓波
苏衍畔
陈广库
杨瑞
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.)
Harbin Engineering University
Original Assignee
Harbin Engineering University
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 Harbin Engineering University filed Critical Harbin Engineering University
Publication of CN108590874A publication Critical patent/CN108590874A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00Pistons 
    • F02F3/16Pistons  having cooling means
    • F02F3/20Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00Liquid cooling
    • F01P3/06Arrangements for cooling pistons
    • F01P3/08Cooling of piston exterior only, e.g. by jets
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/025Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes having non-capillary condensate return means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081Heat exchange elements made from metals or metal alloys
    • F28F21/085Heat exchange elements made from metals or metal alloys from copper or copper alloys

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The purpose of the present invention is to provide a kind of marine low speed diesel engine pistons comprising cooling device, including piston only, cooling device, it is the cooling path that cooling oil enters in the middle part of piston only, the cooling chamber of outside setting storage cooling device in the middle part of piston only, the cooling path of connection cooling oil outflow below cooling chamber, it is separated with cooling wall between the cooling path that cooling chamber and cooling oil enter, piston nozzle opening is provided on cooling wall;The cooling device includes the heat pipe being axially distributed and circumferentially distributed heat pipe, the heat pipe being axially distributed is uniformly distributed composition cylinder, circumferentially distributed heat pipe forms hemisphere and is affixed on the top of cylinder, setting and the matched oilhole of piston nozzle opening on cylinder.Top of the present invention makes heat-conducting effect reinforce, to reinforce top cooling effect by the circumferentially wound formation quick conductive annular chamber of heat pipe;Lower end uses axial arranged heat pipe, bottom end to arrange fin, accelerates the heat transfer rate on top and lower end.

Description

A kind of marine low speed diesel engine piston comprising cooling device
Technical field
The present invention relates to a kind of diesel engines, the specifically piston of diesel engine.
Background technology
Piston is burning chamber of diesel engine important component, it plays sealing cylinder and gas pressure is passed to connecting rod Effect, periodic mechanical load and thermic load are subject due to being chronically exposed to combustion chamber inner carrier.The height of piston temperature The intensity and problem of oxidation of its material are will have a direct impact on, excessively high temperature can also make top land burn.And due to its thermal expansion And, entire piston reduced service life deadlocked with cylinder, it results even in complete machine job stability and is substantially reduced.Therefore piston closes The heat dissipation of reason and the type of cooling are to reduce piston heat load, increase the effective ways of piston service life and complete machine stability.
The cooling of piston is either cooled down using the oil of crankcase using water cooling.Since the specific heat capacity of water is larger, water There is better cooling effect than oil.But since water cooling has the risk that water leaks into crankcase, existing diesel engine most For oil cooled piston.Marine low-speed large-scale diesel engine mostly uses greatly cooling oil oscillatory type cooling piston, but since cooling oil chamber exists Cooling Dead Core Problems so that piston-top surface regional area is susceptible to high temperataure phenomena.
In addition, if piston cooling oil chamber local temperature is excessively high or surface flatness is bad, it is susceptible to carbon deposition phenomenon, is led Cause local thermal stress excessively high.To solve the above problems, present low-speed diesel engine oil cooled piston mostly uses greatly the work of oilhole cooled Plug, it is simple and convenient.But this piston-top surface edge is susceptible to maximum temperature, and external cylindrical oil pocket top cools down Effect is bad.
Invention content
The purpose of the present invention is to provide solve the slow and cooling Dead Core Problems of heat concentration, radiating rate at marginal surface A kind of marine low speed diesel engine piston comprising cooling device.
The object of the present invention is achieved like this:
A kind of marine low speed diesel engine piston comprising cooling device of the present invention, including piston only, it is characterized in that:Including Cooling device, the piston only middle part are the cooling path that cooling oil enters, and the outside setting storage in the middle part of piston only is cold But the cooling road that the cooling chamber of device, the cooling path of cooling chamber lower section connection cooling oil outflow, cooling chamber and cooling oil enter It is separated with cooling wall between diameter, piston nozzle opening is provided on cooling wall;The cooling device includes the heat pipe being axially distributed and circumferential direction The heat pipe of distribution, the heat pipe being axially distributed are uniformly distributed composition cylinder, and circumferentially distributed heat pipe composition hemisphere is simultaneously affixed on circle On the top of cylinder, setting and the matched oilhole of piston nozzle opening on cylinder.
The present invention can also include:
1, fin is arranged in cylinder lower end, and fin is fitted in the heat pipe rear surface being axially distributed.
2, the circumferentially distributed heat pipe runs through heat pipe including four, through the top of heat pipe and circumferentially distributed heat pipe It crosses, is stretched out outside cylinder through the bottom end of heat pipe, and contact piston skirt below.
3, the heat pipe and circumferentially distributed heat pipe being axially distributed are enclosed heat pipe, and the inner wall of enclosed heat pipe attaches mesh-like Liquid-sucking core.
4, cylinder and hemispheroidal inner surface smooth treatment;Cooling device is whole to fit with cooling cavity wall.
Advantage of the invention is that:
1, heat exchange of heat pipe itself has excellent heat conductivility, heat exchange efficiency high, closed type hot intraductal working medium once being filled with, Without adding again, working medium can be recycled in heat pipe.
2, piston exterior cylinder oil pocket top can be reinforced by the excellent heat conductivity performance of the circumferentially distributed heat pipe in upper end The cooling Dead Core Problems on top are eliminated in heat conduction.
3, axially distribution heat pipe can accelerate the heat transfer effect of cooling oil chamber top and bottom end for device lower end, further strengthen The cooling effect on cooling oil chamber top.
4, the fin of bottom end can increase the heat dissipation area of bottom heat pipe, be conducive to cold rapidly using the low temperature of piston base But upper end heat pipe reinforces cooling effect.
5, through whole device is distributed in, reinforce the circumferentially distributed heat pipe in top and lower end axial direction distributed heat using through heat pipe The heat exchange of pipe;Axially extended section of invention is conducive to the low temperature that cooling device makes full use of piston skirt part, reinforces heat pipe Heat conduction and heat dissipation effect.
6, device inner surface uses smooth treatment, is conducive to reduce cooling oil flow resistance, improves flowing velocity, accelerates cold Oily cycle, and can reduce because of surface roughness and cross the carbon-collecting problem of thermosetting.
Description of the drawings
Fig. 1 is the cooling device schematic diagram of the present invention;
Fig. 2 is the structural schematic diagram when present invention does not install cooling device;
Fig. 3 is distribution schematic diagram of the present invention through heat pipe on device top.
Specific implementation mode
It illustrates below in conjunction with the accompanying drawings and the present invention is described in more detail:
In conjunction with Fig. 1-3, a kind of marine low speed diesel engine piston comprising cooling device of the present invention includes mainly piston sheet Body, cooling device, cooling device include circumferentially distributed heat pipe 1, oilhole 2, the heat pipe 3 being axially distributed, fin 4, smooth treatment Inner surface 5, the heat pipe 6 through distribution.Cooling device tip portion, equally distributed circumferential direction heat pipe 1 is with four through heat pipe 6 It crosses.Axial heat pipe 3, oilhole 2 and 11 position of piston exterior cylinder nozzle opening and size phase are uniformly distributed around cooling device Together.Fin 4 is circumferential to be fitted tightly over the heat pipe rear surface being axially distributed.Cooling device inner surface 5 uses surface smooth treatment, Reinforce surface flatness.Four run through heat pipe 6 through whole device is distributed in, and four axially extended through heat pipe, and it is made to connect Touch piston skirt 8.Heat pipe is enclosed heat pipe, and heat resistant material is copper;Heat pipe inner wall attaches mesh-like liquid-sucking core, makes work using capillary force Make liquid not limitation of heat pipe position in liquid-sucking core.
Since cooling device of the present invention is mainly used in large-sized low-speed diesel engine piston, so cooling device of the present invention is not It can be difficult to manufacture because too small or volume is excessive, processing performance is good.
As shown in Figure 1 and Figure 2, at the external cylindrical cooling chamber 10 i.e. position A of cooling device installation of the present invention in fig. 2, Cooling oil is along cooling during rolling oil pocket of the flow path 12 through the cooling advanced piston head of tubing and casing, when cooling oil is from piston nozzle opening 11 spray into through the inflow cooling device of cooling device oilhole 2, again through the hollow circulating line 12 with casing composition of piston rod after cooling It flows back to.After cooling oil flows into oilhole 2, the oil pocket that circumferentially distributed heat pipe 1 is formed at the top of cooling device is first vibrated, passes through circumferential point Cloth heat pipe quick conductive, transfers heat to cooling oil;For cooling dead angle existing for top, the heat pipe through excellent heat conductivity, So that heat quickly passes to cooling oil herein.As cooling oil flows downward, axial distribution heat pipe 3 is come into contact with, due to axis It is contacted to distribution 3 lower end of heat pipe with the lower piston skirt surface of temperature so that upper pyrometer section and lower part low-temperature zone flash heat transfer, Form preferable heat transfer and heat dissipation effect.In order to preferably utilize the low temperature part around piston skirt 8, the present invention to use fin 4 The method for fitting closely cooling device lower end increases the contact area of lower end low-temperature zone piston and cooling device, makes dissipating for lower end Hot area increases, and reinforces the heat dissipation effect of lower end, to accelerate the heat-transfer rate of top high temperature and low-temperature end.Device inner surface 5 Using smooth treatment, be conducive to reduce cooling oil flow resistance, improve flowing velocity, accelerates the cycle of cooling oil, enhancing cooling Effect, and the carbon distribution problem that inner surface is likely to form can be reduced.
As shown in figure 3, running through the top and bottom of whole device through heat pipe 6 using four, it can effectively reinforce piston The heat dispersal situations of the apical position of external cylindrical cooling chamber, this is also the high temperature position that the present invention is directed to piston-top surface edge The effective measures taken of cooling;The part axially extended through heat pipe 6 is contacted with the inner surface of piston skirt 8, herein temperature Temperature than 4 position of fin is also low, and the heat that temperature difference increasing is conducive to apical position distributes rapidly, can effectively reinforce top The cooling effect of dead angle position that may be present, to reduce piston-top surface lip temperature.

Claims (9)

1. a kind of marine low speed diesel engine piston comprising cooling device, including piston only, it is characterized in that:It is filled including cooling It sets, is the cooling path that cooling oil enters in the middle part of the piston only, the outside setting storage cooling device in the middle part of piston only Cooling chamber, the cooling path of connection cooling oil outflow below cooling chamber, between the cooling path that cooling chamber and cooling oil enter It is separated with cooling wall, piston nozzle opening is provided on cooling wall;The cooling device includes the heat pipe being axially distributed and circumferentially distributed Heat pipe, the heat pipe being axially distributed are uniformly distributed composition cylinder, and circumferentially distributed heat pipe composition hemisphere is simultaneously affixed on cylinder On top, setting and the matched oilhole of piston nozzle opening on cylinder.
2. a kind of marine low speed diesel engine piston comprising cooling device according to claim 1, it is characterized in that:Cylinder Fin is arranged in lower end, and fin is fitted in the heat pipe rear surface being axially distributed.
3. a kind of marine low speed diesel engine piston comprising cooling device according to claim 1 or 2, it is characterized in that:Institute The circumferentially distributed heat pipe stated includes four and runs through heat pipe, crosses through the top of heat pipe and circumferentially distributed heat pipe, penetration heat The bottom end of pipe is stretched out outside cylinder, and contacts piston skirt below.
4. a kind of marine low speed diesel engine piston comprising cooling device according to claim 1 or 2, it is characterized in that:Axis It is enclosed heat pipe to the heat pipe of distribution and circumferentially distributed heat pipe, the inner wall of enclosed heat pipe attaches mesh-like liquid-sucking core.
5. a kind of marine low speed diesel engine piston comprising cooling device according to claim 3, it is characterized in that:Axial point The heat pipe of cloth and circumferentially distributed heat pipe are enclosed heat pipe, and the inner wall of enclosed heat pipe attaches mesh-like liquid-sucking core.
6. a kind of marine low speed diesel engine piston comprising cooling device according to claim 1 or 2, it is characterized in that:Circle Cylinder and hemispheroidal inner surface smooth treatment;Cooling device is whole to fit with cooling cavity wall.
7. a kind of marine low speed diesel engine piston comprising cooling device according to claim 3, it is characterized in that:Cylinder And hemispheroidal inner surface smooth treatment;Cooling device is whole to fit with cooling cavity wall.
8. a kind of marine low speed diesel engine piston comprising cooling device according to claim 4, it is characterized in that:Cylinder And hemispheroidal inner surface smooth treatment;Cooling device is whole to fit with cooling cavity wall.
9. a kind of marine low speed diesel engine piston comprising cooling device according to claim 5, it is characterized in that:Cylinder And hemispheroidal inner surface smooth treatment;Cooling device is whole to fit with cooling cavity wall.
CN201810532493.1A 2018-05-03 2018-05-29 A kind of marine low speed diesel engine piston comprising cooling device Pending CN108590874A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201810413759 2018-05-03
CN2018104137590 2018-05-03

Publications (1)

Publication Number Publication Date
CN108590874A true CN108590874A (en) 2018-09-28

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ID=63630176

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Application Number Title Priority Date Filing Date
CN201810532493.1A Pending CN108590874A (en) 2018-05-03 2018-05-29 A kind of marine low speed diesel engine piston comprising cooling device

Country Status (1)

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CN (1) CN108590874A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005048981A1 (en) * 2005-10-13 2007-04-26 Man B & W Diesel A/S Piston cooling arrangement for large two-stroke crosshead diesel engine has piston connecting rods delivering coolant to bell chamber with inner plug and jets
CN101002013A (en) * 2004-08-11 2007-07-18 玛勒国际有限公司 Lightweight piston comprising heat pipes
US20070251487A1 (en) * 2004-08-11 2007-11-01 Peter Heidrich Light-Metal Piston Having Heat Pipes
CN202417676U (en) * 2011-12-02 2012-09-05 大连海事大学 Intelligent piston cooling system for marine diesel engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101002013A (en) * 2004-08-11 2007-07-18 玛勒国际有限公司 Lightweight piston comprising heat pipes
US20070251487A1 (en) * 2004-08-11 2007-11-01 Peter Heidrich Light-Metal Piston Having Heat Pipes
DE102005048981A1 (en) * 2005-10-13 2007-04-26 Man B & W Diesel A/S Piston cooling arrangement for large two-stroke crosshead diesel engine has piston connecting rods delivering coolant to bell chamber with inner plug and jets
CN202417676U (en) * 2011-12-02 2012-09-05 大连海事大学 Intelligent piston cooling system for marine diesel engine

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Application publication date: 20180928