CN212130650U - Oil nozzle matching part of high-pressure common-rail oil injector - Google Patents
Oil nozzle matching part of high-pressure common-rail oil injector Download PDFInfo
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- CN212130650U CN212130650U CN202020761820.3U CN202020761820U CN212130650U CN 212130650 U CN212130650 U CN 212130650U CN 202020761820 U CN202020761820 U CN 202020761820U CN 212130650 U CN212130650 U CN 212130650U
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- oil inlet
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Abstract
A fuel spray nozzle matching part of a high-pressure common rail fuel injector is characterized in that a needle guide hole is axially arranged at the center of a needle valve body; the needle valve comprises an oil inlet guide section, an axial oil inlet structure is arranged on the cylindrical surface of the oil inlet guide section, and the oil inlet guide section is matched with the valve needle guide hole precision clearance matching part. A variable-section oil inlet channel is formed between the axial oil inlet structure and the valve needle guide hole, and the oil inlet end is large and the oil outlet end is small. The structure can improve the matching precision of the valve needle body and the valve needle, improve the lubricating condition of the matching section, reduce the axial oil inlet resistance, and improve the injection pressure, the atomization effect and the operation reliability of the oil injector. The axial oil inlet structure is designed into a spiral line distribution structure, so that the oil mist injection direction of the oil inlet end can be changed, the oil mist injection coverage area is increased, the full combustion of diesel oil is facilitated, and the exhaust emission of a diesel engine is optimized.
Description
The technical field is as follows:
the utility model relates to a quick response's diesel engine common rail sprayer especially relates to the fuel sprayer mating parts wherein.
Background art:
in the high-pressure common-rail quick response oil injector, an oil injection nozzle matching part is very key, directly influences the oil injection atomization quality of an oil injector assembly and the response time in the working process, and improves the response speed.
The utility model has the following contents:
the utility model aims at providing a fuel sprayer mating parts of high pressure common rail fuel injector, it is the core part of high pressure common rail quick response fuel injector.
The utility model adopts the technical proposal that:
the utility model provides a high pressure common rail fuel injector's nozzle matching parts, includes needle valve body and needle, characterized by: an upper oil storage cavity, a valve needle guide hole, a middle oil storage cavity and a lower oil storage cavity are sequentially arranged in the center of the needle valve body from top to bottom along the axial direction; the valve needle comprises an upper guide rod, an oil inlet guide section and a lower rod body, an axial oil inlet structure is arranged on the cylindrical surface of the oil inlet guide section, an axial limiting surface is formed at the joint of the upper guide rod and the oil inlet guide section, the upper guide rod of the valve needle and a valve core guide hole are in a matching relation of a matching part, and the oil inlet guide section is matched with a precise clearance matching part of the valve needle guide hole.
Further, the axial oil inlet structure is an axial oil inlet groove, and an oil inlet channel is formed between the axial oil inlet groove and the valve needle guide hole.
Furthermore, the axial oil inlet groove is a variable-section axial oil inlet groove, and the area of the section decreases from top to bottom.
Furthermore, the cross section of the axial oil inlet groove is arc-shaped, triangular or quadrilateral.
Furthermore, the axial oil inlet groove is a spiral line.
Furthermore, the axial oil inlet structure is an axial oil inlet plane, the maximum width of the axial oil inlet plane is smaller than the radius of the oil inlet guide section, and an oil inlet channel is formed between the axial oil inlet plane and the valve needle guide hole.
Further, the axial variable cross-section plane of the axial oil inlet structure, and the area of an oil inlet passage formed between the axial variable cross-section oil inlet plane and the valve needle guiding hole is gradually reduced from top to bottom.
The utility model discloses the beneficial effect who gains:
the axial oil inlet structure is arranged on the cylindrical surface of the oil inlet guide section of the valve needle, so that a smooth axial oil inlet channel is formed between the oil inlet guide section and the valve needle guide hole in the valve needle body, the fit clearance between the upper guide rod and the oil inlet guide section and the valve needle guide hole can be improved, the axial oil inlet resistance can be reduced, the lubricating condition of the needle valve body and the valve needle fit section can be further improved, and the operation reliability of an oil nozzle matching part is improved.
The variable cross-section oil inlet groove or the oil inlet plane of the axial oil inlet structure can improve the injection pressure and the atomization effect of the oil injector.
The axial oil inlet structure is designed into a spiral line distribution structure, so that the oil mist injection direction of the oil inlet end can be changed, the oil mist injection coverage area is increased, the full combustion of diesel oil is facilitated, and the exhaust emission of a diesel engine is optimized.
Description of the drawings:
fig. 1 is a schematic structural view of the utility model;
FIG. 2 is a schematic view of the structure of the valve needle body;
FIG. 3 is a schematic view of a needle valve;
FIG. 4 is an enlarged view of a cross-section taken at location A-A of FIG. 3;
FIG. 5 is an enlarged view of another structure of the cross-section taken at the position A-A in FIG. 3;
in the figure: 1-needle valve body; 2-a valve needle; 3-an oil inlet channel; 11-upper oil storage cavity; 12-valve needle guide holes; 13-an intermediate oil storage chamber; 14-a lower oil storage cavity; 21-an upper guide bar; 22-an oil inlet guide section; 23-lower rod body; 24-an axial oil feed structure; 241-axial oil inlet groove; 242-axial oil entry plane; 25-axial limit surface.
The specific implementation mode is as follows:
the following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
example 1: an oil nozzle matching part of a high-pressure common rail oil injector is shown in figures 1-5 and comprises a needle valve body 1 and a needle 2, wherein an upper oil storage cavity 11, a needle guide hole 12, a middle oil storage cavity 13 and a lower oil storage cavity 14 are sequentially arranged at the center of the needle valve body 1 from top to bottom along the axial direction; the valve needle 2 comprises an upper guide rod 21, an oil inlet guide section 22 and a lower rod body 23, an axial oil inlet structure 24 is arranged on the cylindrical surface of the oil inlet guide section 22, an axial limiting surface 25 is formed at the joint of the upper guide rod 21 and the oil inlet guide section 22, the upper guide rod 21 of the valve needle 2 is matched with a valve core guide hole to form a matching part, and the oil inlet guide section 22 is matched with a precise clearance matching part of the valve needle guide hole 12.
In this example, the axial oil inlet structure 24 is an axial oil inlet groove 241 with a uniform cross section.
Example 2: the difference from the embodiment 1 is that the axial oil inlet groove 241 is a variable cross-section axial oil inlet groove, and the cross-sectional area decreases from top to bottom.
In the two embodiments, the cross-sectional shape of the axial oil inlet groove 241 is any one of circular arc, triangle or rectangle.
Example 3: in the above two embodiments, the axial oil inlet grooves 241 are changed to be distributed in a spiral line.
Example 4: the difference from embodiment 1 is that the axial oil feeding structure 24 is an axial oil feeding plane 242, and the maximum width of the axial oil feeding plane 242 is smaller than the oil feeding guide section 22 and the radius.
Example 5: the difference from embodiment 4 is that the axial oil inlet structure 24 is an axial variable cross-section oil inlet plane, and the axial oil inlet plane 242 has a large top and a small bottom, and the area of the oil inlet passage 3 formed between the axial oil inlet plane and the valve needle guide hole 12 decreases progressively.
The utility model discloses an implementation is many, does not list one by one here, as long as adopt with all technical scheme that function was substituted such as the utility model all belong to within the protection scope.
Claims (7)
1. The utility model provides a high pressure common rail fuel injector's nozzle matching parts, includes needle valve body (1) and needle (2), characterized by: an upper oil storage cavity (11), a valve needle guide hole (12), an intermediate oil storage cavity (13) and a lower oil storage cavity (14) are sequentially arranged in the center of the needle valve body (1) from top to bottom along the axial direction; the valve needle (2) comprises an upper guide rod (21), an oil inlet guide section (22) and a lower rod body (23), an axial oil inlet structure (24) is arranged on the cylindrical surface of the oil inlet guide section (22), an axial limiting surface (25) is formed at the joint of the upper guide rod (21) and the oil inlet guide section (22), the upper guide rod (21) of the valve needle (2) and a valve core guide hole are in matching relation of a matching part, and the oil inlet guide section (22) is matched with a valve needle guide hole (12) precision clearance matching part.
2. The nozzle matching part of the high-pressure common rail injector according to claim 1, characterized in that: the axial oil inlet structure (24) is an axial oil inlet groove (241), and an oil inlet channel (3) is formed between the axial oil inlet groove (241) and the valve needle guide hole (12).
3. The nozzle matching part of the high-pressure common rail injector according to claim 2, characterized in that: the axial oil inlet groove (241) is a variable-section axial oil inlet groove, and the area of the section decreases from top to bottom.
4. The nozzle matching part of the high-pressure common rail injector according to claim 2 or 3, characterized in that: the cross section of the axial oil inlet groove (241) is arc-shaped, triangular or quadrilateral.
5. The nozzle matching part of the high-pressure common rail injector according to claim 2 or 3, characterized in that: the axial oil inlet groove (241) is a spiral line.
6. The nozzle matching part of the high-pressure common rail injector according to claim 4, characterized in that: the axial oil inlet structure is an axial oil inlet plane (242), the maximum width of the axial oil inlet plane (242) is smaller than the radius of the oil inlet guide section (22), and an oil inlet channel (3) is formed between the axial oil inlet plane (242) and the valve needle guide hole (12).
7. The nozzle matching part of the high-pressure common rail injector according to claim 6, characterized in that: the axial oil inlet plane (242) is an axial variable cross-section plane, and the area of an oil inlet passage formed between the axial variable cross-section oil inlet plane and the valve needle guide hole (12) decreases from top to bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020761820.3U CN212130650U (en) | 2020-05-09 | 2020-05-09 | Oil nozzle matching part of high-pressure common-rail oil injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020761820.3U CN212130650U (en) | 2020-05-09 | 2020-05-09 | Oil nozzle matching part of high-pressure common-rail oil injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212130650U true CN212130650U (en) | 2020-12-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020761820.3U Active CN212130650U (en) | 2020-05-09 | 2020-05-09 | Oil nozzle matching part of high-pressure common-rail oil injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212130650U (en) |
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2020
- 2020-05-09 CN CN202020761820.3U patent/CN212130650U/en active Active
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