CN102536507A - Novel sealing bowl-shaped plug for highly intensified diesel engine - Google Patents
Novel sealing bowl-shaped plug for highly intensified diesel engine Download PDFInfo
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- CN102536507A CN102536507A CN2012100363114A CN201210036311A CN102536507A CN 102536507 A CN102536507 A CN 102536507A CN 2012100363114 A CN2012100363114 A CN 2012100363114A CN 201210036311 A CN201210036311 A CN 201210036311A CN 102536507 A CN102536507 A CN 102536507A
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Abstract
The invention discloses a novel sealing bowl-shaped plug for a highly intensified diesel engine. The plug is made of a stainless steel material, the excircle sealing surface of the plug is subjected to a micro taper design, the end face of the plug has an arc shape, and the wall thickness of the section of the plug is reduced and uniform; and the diameter of the excircle surface of the bowl-shaped plug is increased, so that radial interference during installation is increased. The novel bowl-shaped plug is arranged in a taphole of a cylinder cover water jacket of the diesel engine or a gas engine in gluing and pressure interference modes; and the shape and size of the novel bowl-shaped plug are subjected to sealing performance analog computation and verification by a computer, and a reliability test performed by a test machine proves that the novel bowl-shaped plug obviously improves the sealing performance of the taphole of a cylinder cover, meets the requirements of the cylinder cover of the highly intensified diesel engine or the gas engine on a heat load and a mechanical load, and improves the sealing performance and using reliability of the whole engine.
Description
Technical field
The present invention relates to the novel seal bowl type plug that a kind of highly-intensified diesel engine is used.
Background technique
DENG is the main composition part of China's independent research internal combustion type dynamic power machine; On its basis, only need very little distortion just can develop all kinds of gas engines, the power character, Economy, the requirement energy-conservation and environmental protection and reliability that are accompanied by diesel engine and gas engine improve constantly, and need strengthen motor in the type R&D process; Gaseous-pressure is as main reinforcement means in the cylinder that improves constantly; Make the engine heat load level significantly increase, special on the cylinder cap of motor, embody the most obviously that a bowl type plug is installed on cylinder head water blocks up; Bear the heat load of alternation together impacts and the mechanical load effect along with cylinder cap; After the seal failure of bowl type plug, the cooling water in the cylinder cap water jacket spills, and will cause motor serious overheated and cause firing chamber related components hot tearing, ablation etc.; Get into engine interior or lubrication system if leak, certainly will cause the complete machine overhaul even scrap.
At present, in the type of commercial car large diesel engine more than three levels of emissions of Europe that China produces in batches, pressure maximum is all above 16Mpa in the cylinder; The type of some maximum discharge grade need be demarcated the level of 18Mpa-20Mpa, and under this condition, the cylinder cap structure temperature is very high; The inner cooling water of cylinder cap needs flow velocity faster, so that take away more heats, if seal failure appears in water blocking; To break the pressure distribution of flow of cooling water, and flow velocity occur and reduce further deterioration exchange capability of heat.Especially under the impact of the high-temperature exhaust air of cylinder cap air outlet flue, the observed temperature of corresponding type shows: the bowl type plug of exhaust side water blocking is installed local temperature and is surpassed 130 degrees centigrade, and the temperature distributing disproportionation around the bowl type plug is even, and maximum temperature difference surpasses 40 and spends.
But there is following shortcoming in present bowl type plug: 1. the bowl type plug of domestic large diesel engine mainly uses copper material; Consider the good heat conductivity of copper; Can follow the temperature variation of cylinder cap preferably at the block up copper bowl type plug installed of cylinder head water, simultaneously heat derived.But heat load constantly increases in cylinder, and the yield region of copper material elastoplasticity curve is lower; Under the synthesis of localized hyperthermia and mechanical load, copper bowl type plug local plastic deformation appears easily, in the cold shock testing of corresponding type, find especially; The heat load that constantly colds and heat succeed each other is impacted; Make copper bowl type plug more be prone to the accumulating plastic deformation, find after about 500 hours that its cylindrical sealing surface withdraws from about 1-2mm, simultaneously; Because the heat load of gas engine is higher than diesel engine, the plastic deformation effect of this accumulation can more early embody under the gas engine same test conditions.2. the interference mode is adopted in the installation of blocking up of bowl type plug and cylinder head water, and the size of magnitude of interference has appreciable impact to sealing, because the copper material Young's modulus is low, excessive magnitude of interference causes local yielding to form installation folding line and concave point easily, causes seal failure.3. the sealing station of bowl type plug is mainly at periphery, and copper bowl type disc beyond the Great Wall all adopts positive cylndrical surface form, and end face adopts plane form, and knuckle is less and wall thickness is bigger.For of the influence of the concrete size of detail knowledge to sealing; Set up the finite element sealed mould analog model of bowl plug with cylinder cap; Find that through computer simulation analysis the bowl type plug sealing surface of this form was on the 2-3mm arrowband of periphery near the end face side after interference was installed, the contact pressure of this arrowband and cylinder cap water blocking face is higher than 200Mpa; Other part contact pressures of periphery all are lower than 50Mpa, and at the knuckle place tangible structural stress concentration phenomenon are arranged.It is thus clear that the size of positive cylndrical surface is unfavorable for setting up sealing surface stable and broad.End face adopts plane form to be prone to cause the knuckle place to produce higher stress and concentrates, if knuckle further increases the degree that stress is concentrated than the young pathbreaker.The wall thickness increase can improve the rigidity and the intensity of structure, but cost can increase thereupon.
Therefore material, periphery, end face, knuckle and the design of Wall Thickness of bowl type plug can its sealability of appreciable impact and parts fatigue durabilities.
Summary of the invention
Be technical deficiency more than solving, the invention provides a kind of structural reliability height, good seal performance, the novel seal bowl type plug that the highly-intensified diesel engine that cost is low is used.
The present invention realizes through following measure:
The novel seal bowl type plug that a kind of highly-intensified diesel engine of the present invention is used comprises cock body, said cock body
The top is a circular end surface, and said end face edge is extended with annular sidewall downwards, and the cock body bottom is circular plug mouth, and said cock body is a stainless steel, and the sidewall cross section of cock body is up-narrow and down-wide taper.
Circular arc, end face and the sidewall rounding off of the cross section of the end face of above-mentioned cock body for upwards swelling.
The plug mouth of above-mentioned cock body and the radial interference amount of mount inlet are 0.15-0.25mm.
The invention has the beneficial effects as follows:
Adopt stainless steel material, and optimized the shape and size parameter of bowl type plug, thereby change area of contact, the pressure of seal band and reduce fillet stress concentrated; Through motor full load test at full speed, cold shock testing novel bowl type is filled in capable seal tightness test, this practical structural reliability is high, and cost is low; The work durability is strong; Good sealing effect satisfies the engine condition requirement, the phenomenon of seal failure do not occur.
Description of drawings
Accompanying drawing 1 is a cross-sectional view of the present invention.
Accompanying drawing 2 is a three-dimensional cut-away section structural representation of the present invention.
Among the figure: 1 end face, 2 sidewalls, 3 plug mouths.
Embodiment
Like Fig. 1, shown in 2, the novel seal bowl type plug that a kind of highly-intensified diesel engine of the present invention is used, bag
Draw together cock body, the cock body top is a circular end surface 1, and end face 1 edge is extended with annular sidewall 2 downwards, and the cock body bottom is circular plug mouth 3, and cock body adopts stainless steel.Corrosion-resistant under the bowl type plug operating conditions of stainless steel, rigidity is high, the plasticity_resistant deformation ability is strong, can use bigger magnitude of interference to increase sealing effect.The temperature of stainless steel bowl type plug center reduces about 15 degrees centigrade, and simultaneously, the fatigue strength of stainless steel structure increases, and cost is lower.
The circular arc of the cross section of the end face 1 of cock body for upwards swelling, end face 1 and sidewall 2 rounding ofves.Effectively reduce the stress concentration degree at knuckle place, under the hot machine coupling operating conditions, the major principal stress at novel bowl type plug knuckle place is compared original structure and is reduced about 90Mpa, and simultaneously, arc surface is the even distribution of arc surface at the pressure of cooling water side.
The plug mouth 3 of cock body is 0.15-0.25mm with the radial interference amount of mount inlet.It is about 210% that the magnitude of interference of blocking up with cylinder cap increases, and the middle pressure of the sealing surface under the installation conditions improves 150%, and the dispersion of distribution increases 1-1.5 doubly.
The checking of novel bowl type plug in engine reliability test:
In the cold shock testing of heavy type 6 cylinder turbocharged and intercooled diesel engines in upright arrangement; Former copper bowl type plug and novel stainless steel bowl type plug are installed respectively; Carry out cylinder head water road seal tightness test after the test after 500 hours; Former copper bowl type plug occurs leaking and seal failure, and novel stainless steel bowl type plug water leakage phenomenon do not occur and sealing is good.Meanwhile; In the full speed full load test of the higher same model gas engine of heat load; Former copper bowl type plug and novel stainless steel bowl type plug are installed respectively, and the cylinder cap water route seal tightness test after 500 hours after the test shows that former copper bowl type plug occurs leaking and seal failure; Bowl type plug is blocked up relatively and the amount of withdrawing from of 1-2mm occurred, and withdrawing from does not appear in novel stainless steel bowl type plug, sealability keeps good.
The foregoing description is said to be in order to specify this patent; Though describe through specific term in the literary composition; But can not limit the protection domain of this patent with this; The personage who is familiar with this technical field can change or revise it after the spirit of understanding this patent and principle and reach equivalent purpose, and this equivalence change and modification all should be covered by the claim scope and define in the category.
Claims (3)
1. novel seal bowl type plug that highly-intensified diesel engine is used; Comprise cock body; Said cock body top is a circular end surface, and said end face edge is extended with annular sidewall downwards, and the cock body bottom is circular plug mouth; It is characterized in that: said cock body is a stainless steel, and the sidewall cross section of cock body is up-narrow and down-wide taper.
2. the novel seal bowl type plug of using according to the said highly-intensified diesel engine of claim 1 is characterized in that: circular arc, end face and the sidewall rounding off of the cross section of the end face of said cock body for upwards swelling.
3. the novel seal bowl type plug of using according to the said highly-intensified diesel engine of claim 1 is characterized in that: the plug mouth of said cock body and the radial interference amount of mount inlet are 0.15-0.25mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100363114A CN102536507A (en) | 2012-02-17 | 2012-02-17 | Novel sealing bowl-shaped plug for highly intensified diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100363114A CN102536507A (en) | 2012-02-17 | 2012-02-17 | Novel sealing bowl-shaped plug for highly intensified diesel engine |
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| Publication Number | Publication Date |
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| CN102536507A true CN102536507A (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100363114A Pending CN102536507A (en) | 2012-02-17 | 2012-02-17 | Novel sealing bowl-shaped plug for highly intensified diesel engine |
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| CN (1) | CN102536507A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105351108A (en) * | 2015-10-02 | 2016-02-24 | 李军 | Engine cylinder head bowl-shaped plug and process method thereof |
| CN112412653A (en) * | 2020-11-24 | 2021-02-26 | 潍柴动力股份有限公司 | Bowl-shaped plug and engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2714819Y (en) * | 2004-02-11 | 2005-08-03 | 赵全祥 | Water block of engine |
| CN202417737U (en) * | 2012-02-17 | 2012-09-05 | 中国重汽集团济南动力有限公司 | Novel sealing bowl-shaped plug for high-strengthened diesel engine |
-
2012
- 2012-02-17 CN CN2012100363114A patent/CN102536507A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2714819Y (en) * | 2004-02-11 | 2005-08-03 | 赵全祥 | Water block of engine |
| CN202417737U (en) * | 2012-02-17 | 2012-09-05 | 中国重汽集团济南动力有限公司 | Novel sealing bowl-shaped plug for high-strengthened diesel engine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105351108A (en) * | 2015-10-02 | 2016-02-24 | 李军 | Engine cylinder head bowl-shaped plug and process method thereof |
| CN112412653A (en) * | 2020-11-24 | 2021-02-26 | 潍柴动力股份有限公司 | Bowl-shaped plug and engine |
| CN112412653B (en) * | 2020-11-24 | 2022-03-01 | 潍柴动力股份有限公司 | Bowl-shaped plug and engine |
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Application publication date: 20120704 |
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| WD01 | Invention patent application deemed withdrawn after publication |