CN202483662U - Large diameter transition streamline-shaped exhaust valve stem applied to marine diesel engine - Google Patents
Large diameter transition streamline-shaped exhaust valve stem applied to marine diesel engine Download PDFInfo
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- CN202483662U CN202483662U CN2011205699194U CN201120569919U CN202483662U CN 202483662 U CN202483662 U CN 202483662U CN 2011205699194 U CN2011205699194 U CN 2011205699194U CN 201120569919 U CN201120569919 U CN 201120569919U CN 202483662 U CN202483662 U CN 202483662U
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- valve stem
- exhaust valve
- streamline
- large diameter
- shaped
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Abstract
The utility model discloses a large diameter transition streamline-shaped exhaust valve stem applied to a marine diesel engine. The large diameter transition streamline-shaped exhaust valve stem comprises an exhaust valve stem (1). A valve seat (2) is disposed at the bottom of the exhaust valve stem (1), a sealing face (3) is disposed on an upper end of the valve seat (2) and an arc-shaped transition section (4) is disposed on the exhaust valve stem (1) which is arranged on an inner side of the sealing face (3). The large diameter transition streamline-shaped exhaust valve stem is characterized in that a flat step (5) is disposed between an edge B of the arc-shaped transition section (4) and the sealing face (3). Value range of the width H of the flat step (5) is 0.8-1.5 millimeters. The large diameter transition streamline-shaped exhaust valve stem has the advantages of being simple in structure, ingeniously in design, and capable of preventing high-speed airflow produced in a scavenging process after the exhaust valve stem is open from producing turbulence, and also capable of avoiding unsmooth vortex exhaust. Meanwhile, the large diameter transition streamline-shaped exhaust valve stem can avoid problems that abnormal operations of a valve rotator affect use effect and service life of an exhaust valve.
Description
Technical field
The utility model relates to a kind of diesel exhaust gas valve rod, the streamlined exhasut valve stem of particularly a kind of marine diesel engine.
Background technique
Exhasut valve stem and valve seat are the parts of burning chamber of diesel engine, and they belong to one of component of cylinder head.In the process of diesel engine work, the high temperature and high pressure gas that produces in the firing chamber promotes piston motion, utilizes the piston alternating movement of a plurality of cylinders, drives bent axle and rotates, and realizes the output of moment of torsion.Behind descent of piston; Have a scavenging arrangement and in the firing chamber, inject a certain amount of gas at normal temperature apace; The while exhaust valve opening; The burning chamber waste gas can together be discharged the firing chamber through outlet valve together with this part cryogenic gas, and exhaust valve closure gets into the next work cycle of piston then.The air-flow that enters into outlet valve valve casing part in the scavenging process blows and is arranged on the blade on the rotary valve device on the outlet valve valve rod; Under the effect of air-flow; Rotary valve device drive exhasut valve stem rotates, and final realization relatively rotates with valve seat, and (valve seat is fixed) such capital of the every unlatching of exhasut valve stem and valve seat relatively rotate certain angle; With the suffered wearing and tearing of sealing surface that guarantee valve seat and exhasut valve stem is uniformly on circumference, can prolong the working life of valve seat.The design of existing exhasut valve stem is provided with a plane step between the sealing valve face and the bar stem transition curve conical surface.Like this; In exhaust process, get into high-speed gas in the exhaust valve casing this step place, plane that flows through and to produce eddy current; Influenced the effect of blowing to rotary valve device blade; Might cause exhasut valve stem to rotate smoothly, can't realize the sealing of break-in voluntarily in the air valve working procedure, and then influence the sealing effect and the working life of outlet valve.Therefore need a kind of New Marine diesel exhaust gas valve arrangement that can address the above problem now.
Summary of the invention
The utility model is in order to solve the above-mentioned deficiency of existing in prior technology, proposes a kind of simple in structurely, designs the big disk track transition flow of marine diesel engine line style outlet valve cleverly.
The technical solution of the utility model is: the big disk track transition flow of a kind of marine diesel engine line style outlet valve; Comprise exhasut valve stem 1; The bottom of exhasut valve stem 1 is provided with valve seat 2, and the upper end of valve seat 2 is provided with sealing surface 3, and sealing surface 3 inboard exhasut valve stems 1 are provided with arc-shaped transition section 4; It is characterized in that: be provided with plane step 5 between the edge B of described arc-shaped transition section 4 and the seal ring 3, the width H span of plane step 5 is 0.8～1.5 millimeter.
The utility model is compared with existing technology, has following advantage:
The big disk track transition flow of the marine diesel engine of this kind of structural type line style exhasut valve stem; It is simple in structure, designs ingeniously, and the structure that it fully takes into account existing exhasut valve stem valve seat part is to the influence of the high velocity air that produces in the scavenging process; Near the step of plane air whirl appears for fear of air-flow; And finally cause the situation that the rotary valve device can't proper functioning to take place, with the size of plane step change as far as possible little, reached designing requirement on the one hand; Can also avoid on the other hand air whirl etc. occurring, can guarantee the proper functioning of rotary valve device at this place.This improvement is very simple, with low cost, therefore we can say that this big disk track transition flow line style outlet valve has possessed multiple advantage, and its market prospects are comparatively wide.
Description of drawings
Fig. 1 is the utility model embodiment's a structural representation.
Fig. 2 is the A portion enlarged view of Fig. 1.
Embodiment
Below with the embodiment of accompanying drawings the utility model.Like Fig. 1, shown in Figure 2: the big disk track transition flow of a kind of marine diesel engine line style exhasut valve stem; Comprise exhasut valve stem 1, the upper end of exhasut valve stem 1 links to each other with drive unit, and valve seat 2 is equipped with in the bottom of exhasut valve stem 1; The upper end of valve seat 2 is provided with sealing surface 3; Sealing surface on this sealing surface 3 and the exhasut valve stem 1 matches, and realization is positioned at the sealing of the firing chamber of valve seat 2 bottoms, and sealing surface 3 inboard exhasut valve stems 1 are provided with arc-shaped transition section 4; Be provided with technology plane step 5 between the edge B of arc-shaped transition section 4 and the sealing surface 3 and be used to reface a valve, the span of the width H of this technology plane step 5 is 0.8～1.5 millimeter.
In the working procedure of diesel engine; Fuel oil outburst gas expansion for doing work in the firing chamber promotes descent of piston, and a plurality of piston cooperation actions realize the moment of torsion output of bent axle, in the final stage of descent of piston; Scavenging system can be blown into cool air apace in cylinder and firing chamber; Simultaneously exhasut valve stem 1 moves downward in the effect of drive unit, and the sealing surface 3 on the exhasut valve stem 1 disengages with sealing surface of seat, the exhaust valve opening chamber waste gas discharge of will burn; In order to make the discharge of waste gas more smooth and easy, the exhasut valve stem 1 on valve seat 2 tops is provided with arc-shaped transition section 4, and according to designing requirement, between the edge of this arc-shaped transition section 4 and sealing surface 3, will design a plane step 5.If the size of this plane step 5 is wide; High-temp waste gas this step place, plane that flows through can produce eddy current in exhaust process; Influenced exhaust effect, also can influence the blow effect of air-flow to rotary valve device blade, what be arranged on blade-carrying rotary valve device on the exhasut valve stem 1 can't proper functioning.Might cause exhasut valve stem 1 to rotate smoothly, can't realize the sealing of break-in voluntarily in the air valve working procedure, and then influence the sealing effect and the working life of outlet valve.In order to address this problem, now with the size of plane step 5 be provided with as much as possible little, both satisfied normal designing requirement, can not influence gas flow again.
Claims (1)
1. the big disk track transition flow of marine diesel engine line style exhasut valve stem; Comprise exhasut valve stem (1); The bottom of exhasut valve stem (1) is provided with valve seat (2); The upper end of valve seat (2) is provided with sealing surface (3); The inboard exhasut valve stem (1) of sealing surface (3) is provided with arc-shaped transition section (4), and it is characterized in that: be provided with plane step (5) between the edge B of described arc-shaped transition section (4) and the sealing surface (3), the width H span of plane step (5) is 0.8～1.5 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205699194U CN202483662U (en) | 2011-12-31 | 2011-12-31 | Large diameter transition streamline-shaped exhaust valve stem applied to marine diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205699194U CN202483662U (en) | 2011-12-31 | 2011-12-31 | Large diameter transition streamline-shaped exhaust valve stem applied to marine diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202483662U true CN202483662U (en) | 2012-10-10 |
Family
ID=46958089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205699194U Expired - Fee Related CN202483662U (en) | 2011-12-31 | 2011-12-31 | Large diameter transition streamline-shaped exhaust valve stem applied to marine diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202483662U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329500A (en) * | 2014-10-17 | 2015-02-04 | 南车玉柴四川发动机股份有限公司 | Gas valve conical surface sealing method with cold state angle difference |
| CN105065075A (en) * | 2015-08-24 | 2015-11-18 | 湖南天雁机械有限责任公司 | Engine valve with two-level seals |
-
2011
- 2011-12-31 CN CN2011205699194U patent/CN202483662U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329500A (en) * | 2014-10-17 | 2015-02-04 | 南车玉柴四川发动机股份有限公司 | Gas valve conical surface sealing method with cold state angle difference |
| CN105065075A (en) * | 2015-08-24 | 2015-11-18 | 湖南天雁机械有限责任公司 | Engine valve with two-level seals |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121010 Termination date: 20161231 |