CN201031757Y - Fuel injector assembly for diesel engine - Google Patents
Fuel injector assembly for diesel engine Download PDFInfo
- Publication number
- CN201031757Y CN201031757Y CNU2007201092951U CN200720109295U CN201031757Y CN 201031757 Y CN201031757 Y CN 201031757Y CN U2007201092951 U CNU2007201092951 U CN U2007201092951U CN 200720109295 U CN200720109295 U CN 200720109295U CN 201031757 Y CN201031757 Y CN 201031757Y
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- China
- Prior art keywords
- diesel engine
- injector body
- injector
- needle
- oil
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a marine high-power diesel engine injector assembly, including an injector body. The injector head jointed by a fastening cap includes a needle valve and a needle valve matching part; the injector body is provided with a fastening cap, a guide bushing, a tapper, a spring, an adjusting screw, a sealed cushion, a pad, a flat nut, a nut cap and a sealed ring; the sealed ring is arranged between the fastening cap and the injector body so as to provide good high-pressure fuel sealing performance; the top of the tapper is connected with the spring and the bottom of the tapper is tightly pressed on the base of the needle valve through the jointed needle valve; the tapper is slidingly matched in the guide bushing; the guide bushing and the injector body are in tight fit. The pressure start of the injector can be completed by adjusting the pretightening force of the spring through the adjusting screw. In the working period of the injector, the leaking diesel at all matched gaps is led back to a diesel tank. The utility model with the characteristics of simple structure, convenient adjustment and strong reliability can reduce the oil consumption and discharge of the diesel engine and satisfy the requirements of PA series diesel engine for injector.
Description
Technical field
The utility model relates to the diesel injection pump technical field, relates in particular to the marine diesel engine fuel injector assembly.
Background technique
Oil sprayer is the important composition parts of diesel engine, and its major function is that the high-pressure diesel from Injection Pump is atomized into thinner elaioleucite by certain requirement, and they are distributed in the firing chamber form good inflammable mixture with air.Basic demand to oil sprayer is: have certain jet pressure, certain range, certain spray angle, atomizing is good, oil spout ends rapidly oil-break and does not have weeping.
The needle-valve of oil sprayer and needle-valve body are secondary precision pairs, are called pintle nozzle match-ing parts.The guide cylinder surface on needle-valve top is slidingly matched as highi degree of accuracy with the inner cylindrical surface of needle-valve body, and its gap is about 0.004mm to 0.006mm, and surface roughness reaches Ra0.025 μ m.The conical surface at needle-valve middle part is the pressure-bearing conical surface, and its effect is to bear the end thrust that caused by oil pressure so that needle-valve rises.The sealing cone of needle-valve lower end is to realize the sealing of oil nozzle inner chamber.Corresponding fitting surface all guarantees its quality of fit on the guide cylinder face on needle-valve top and the sealing cone of lower end and the needle-valve body through grinding mutually behind the correct grinding again.The pressure adjusting spring that is contained in oil injector body top is pressed on the sealing cone on the needle-valve body needle-valve by tappet, and spray orifice is closed.The cracking pressure of needle-valve depends on the pretightening force of pressure adjusting spring.It can or regulate pad and regulate by pressure regulating screw.At the oil sprayer duration of work, have the matching gap seepage of a small amount of diesel oil, but this part diesel oil can draw back filter cleaner or diesel fuel tanks by return tube to the matching surface lubricate from injector nozzle matching parts.
Summary of the invention
Technical problem to be solved in the utility model is at above-mentioned deficiency, provides simple in structure, and is easy to adjust, the marine diesel engine fuel injector assembly that functional reliability is strong.
The utility model solves the problems of the technologies described above the technological scheme that is adopted: the marine diesel engine fuel injector assembly, comprise oil injector body, and the oil injector body head connects the pintle nozzle match-ing parts that includes needle-valve body and needle-valve through tight cap; The technical measures of taking comprise: tight cap, guide pin bushing, tappet, spring, adjusting screw, seal washer, pad, flush nut, block and seal ring are housed on the oil injector body; Be provided with seal ring between tight cap and the oil injector body; Tappet top apical grafting spring, this tappet bottom is pressed on the seat surface of needle-valve body through the needle-valve of crimping; And tappet is slidingly fitted in the guide pin bushing; It between described guide pin bushing and the oil injector body interference fit.
The technical measures of taking also comprise: the described adjusting screw of spring top apical grafting.Adjusting screw is after adjusting the cracking pressure of oil sprayer, and is fastening with packing ring, flush nut and block.To guarantee the stable of injection pressure of injector.Prevent oil sprayer in the course of the work cracking pressure change.Position by adjusting adjusting screw can Regulation spring pretightening force, the cracking pressure of control oil sprayer.The to-and-fro motion of tappet is guaranteed the stability of oil sprayer work by the guide pin bushing guiding that is installed on the oil injector body head.
Filler opening is provided with the seal washer of monel metal.The material selection monel metal of seal washer has excellent sealing performance.
The plane that oil injector body is connected with pintle nozzle match-ing parts is the close tolerance seal plane, and is provided with in order to derive the return flow oil hole that matching gap leaks out between parts in its top end position.Oil injector body is provided with spill port, and the diesel oil that each matching gap place of oil sprayer duration of work leaks out is led back diesel fuel tanks, prevents that the oil sprayer chamber pressure is excessive and influences the proper functioning of oil sprayer.
The lift of pintle nozzle match-ing parts is 0.8 ± 0.05mm.
Compared with prior art, on the utility model oil injector body tight cap, guide pin bushing, tappet, spring, adjusting screw, seal washer, pad, flush nut, block and seal ring are housed; Be provided with seal ring between tight cap and the oil injector body, good high pressure fuel sealability is provided; Tappet top apical grafting spring, this tappet bottom is pressed on the seat surface of needle-valve body through the needle-valve of crimping; And tappet is slidingly fitted in the guide pin bushing; It between described guide pin bushing and the oil injector body interference fit.The pretightening force that the cracking pressure of oil sprayer is adjusted spring by adjusting screw can be finished.Characteristics such as the utility model oil sprayer has simple in structure, and is easy to adjust, and functional reliability is strong can reduce the oil consumption and the discharging of diesel engine, satisfy the requirement of PA serial diesel engine to oil sprayer.
Description of drawings
Fig. 1 is the utility model embodiment's a vertical profile structural representation.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
Structure of the present utility model is seen shown in Figure 1.The marine diesel engine fuel injector assembly comprises oil injector body 13, and oil injector body 13 heads connect the pintle nozzle match-ing parts that includes needle-valve body 1 and needle-valve 2 through tight cap 17; It is characterized in that: tight cap 17, guide pin bushing 3, tappet 14, spring 4, adjusting screw 5, seal washer 6, pad 11, flush nut 9, block 10 and seal ring 15 are housed on the oil injector body 13; Be provided with seal ring 15 between tight cap 17 and the oil injector body 13; Tappet 14 top apical grafting springs 4, these tappet 14 bottoms are pressed on the seat surface of needle-valve body 1 through the needle-valve 2 of crimping; And tappet 14 is slidingly fitted in the guide pin bushing 3; Be interference fit between described guide pin bushing 3 and the oil injector body 13.The described adjusting screw 5 of spring 4 top apical graftings.Adjusting screw 5 is after adjusting the cracking pressure of oil sprayer, with packing ring 11, flush nut 9 with block a shot 10 fastening.To guarantee the stable of injection pressure of injector.Prevent oil sprayer in the course of the work cracking pressure change.Position by adjusting adjusting screw can Regulation spring 4 pretightening force, the cracking pressure of control oil sprayer.The to-and-fro motion of tappet is guaranteed the stability of oil sprayer work by the guide pin bushing guiding that is installed on oil injector body 13 heads.Filler opening is provided with the seal washer 6 of monel metal.The material selection monel metal of seal washer has excellent sealing performance.
The plane that oil injector body 13 is connected with pintle nozzle match-ing parts is the close tolerance seal plane, and is provided with in order to derive the return flow oil hole that matching gap leaks out between parts in its top end position.Oil injector body 13 is provided with spill port, and the diesel oil that each matching gap place of oil sprayer duration of work leaks out is led back diesel fuel tanks, prevents that the oil sprayer chamber pressure is excessive and influences the proper functioning of oil sprayer.The lift of pintle nozzle match-ing parts is 0.8 ± 0.05mm.
The key that the utility model oil sprayer is implemented is pintle nozzle match-ing parts, oil injector body 13 and spring 4.Pintle nozzle match-ing parts is a secondary precision pair, and matching gap is 0.004mm to 0.006mm, and the roughness of matching surface is Ra0.05 μ m, and needle-valve body 1 top end is the high pressure sealing surface, and surface roughness requires to be Ra0.05 μ m, and planeness requires to be 0.009mm.The circle of the relative mesopore of needle-valve body 1 seat surface is beated and is 0.003mm.The cylindricity of mesopore requires to be 0.002mm.Needle-valve 2 conical surfaces mutually to foreign round the circle requirement of beating are 0.002mm.The cylindricity of needle-valve 2 guide cylinder circle requires to be 0.002mm, and circularity requires to be 0.001mm.Oil sprayer carries out tests such as cracking pressure adjustment and atomization characteristics after assembling is finished.
Though the utility model illustrates and describes by the reference preferred embodiment,, those skilled in the art should understand, and in the scope of claims, can do the various variation on form and the details.
Claims (5)
1. the marine diesel engine fuel injector assembly comprises oil injector body (13), and oil injector body (13) head connects the pintle nozzle match-ing parts that includes needle-valve body (1) and needle-valve (2) through tight cap (17); It is characterized in that: tight cap (17), guide pin bushing (3), tappet (14), spring (4), adjusting screw (5), seal washer (6), pad (11), flush nut (9), block (10) and seal ring (15) are housed on the described oil injector body (13); Be provided with described seal ring (15) between tight cap (17) and the oil injector body (13); Described tappet (14) top apical grafting spring (4), this tappet (14) bottom is pressed on the seat surface of needle-valve body (1) through the needle-valve (2) of crimping; And tappet (14) is slidingly fitted in the guide pin bushing (3); Between described guide pin bushing (3) and the oil injector body (13) is interference fit.
2. marine diesel engine fuel injector assembly according to claim 1 is characterized in that: described spring (4) the described adjusting screw of top apical grafting (5).
3. marine diesel engine fuel injector assembly according to claim 2 is characterized in that: described filler opening is provided with the seal washer (6) of monel metal.
4. marine diesel engine fuel injector assembly according to claim 3, it is characterized in that: the plane that described oil injector body (13) is connected with pintle nozzle match-ing parts is the close tolerance seal plane, and is provided with in order to derive the return flow oil hole that matching gap leaks out between parts in its top end position.
5. marine diesel engine fuel injector assembly according to claim 1 is characterized in that: the lift of described pintle nozzle match-ing parts is 0.8 ± 0.05mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201092951U CN201031757Y (en) | 2007-05-16 | 2007-05-16 | Fuel injector assembly for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201092951U CN201031757Y (en) | 2007-05-16 | 2007-05-16 | Fuel injector assembly for diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201031757Y true CN201031757Y (en) | 2008-03-05 |
Family
ID=39163649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201092951U Expired - Fee Related CN201031757Y (en) | 2007-05-16 | 2007-05-16 | Fuel injector assembly for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201031757Y (en) |
-
2007
- 2007-05-16 CN CNU2007201092951U patent/CN201031757Y/en not_active Expired - Fee Related
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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 |
Granted publication date: 20080305 Termination date: 20150516 |
|
| EXPY | Termination of patent right or utility model |