CN212376771U - Oil nozzle for high-pressure common rail oil injector - Google Patents
Oil nozzle for high-pressure common rail oil injector Download PDFInfo
- Publication number
- CN212376771U CN212376771U CN202020839283.XU CN202020839283U CN212376771U CN 212376771 U CN212376771 U CN 212376771U CN 202020839283 U CN202020839283 U CN 202020839283U CN 212376771 U CN212376771 U CN 212376771U
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- head
- oil
- needle valve
- cavity
- nozzle body
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- 238000007789 sealing Methods 0.000 claims abstract description 67
- 239000000446 fuel Substances 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 78
- 238000005299 abrasion Methods 0.000 abstract description 6
- 239000000295 fuel oil Substances 0.000 abstract description 5
- 239000007921 spray Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The utility model relates to an oil nozzle for high pressure common rail oil sprayer, including direction head, fuel sprayer body and needle valve, be equipped with upper portion seal chamber in the direction head, be equipped with nozzle body inner chamber in the fuel sprayer body, the lower extreme of direction head inserts nozzle body inner chamber, the lower part of nozzle body inner chamber is equipped with lower part seal chamber, and the needle valve can reciprocate in upper portion seal chamber and nozzle body inner chamber, and the needle valve includes upper portion seal head and lower part seal head; the upper part of the guide head is also provided with a first oil return channel which is communicated with the upper sealing cavity; when the needle valve is positioned at the upper end, the upper sealing head and the upper sealing cavity are sealed; when the needle valve is positioned at the lower end, the outer wall of the lower sealing head and the inner wall of the lower sealing cavity are sealed; after the needle valve is lifted upwards, the upper sealing head and the upper sealing cavity are sealed, so that fuel oil on the upper part of the needle valve is prevented from continuously entering the control valve, and the abrasion to the control valve is reduced.
Description
Technical Field
The utility model relates to an oil sprayer, in particular to oil sprayer for high pressure common rail oil sprayer.
Background
The abrasion of a control valve assembly of an oil injector is a very important reason for the failure of the oil injector and the reduction of the service life of the oil injector, and the abrasion of the control valve assembly is mostly caused by the impact and abrasion of particles on a sealing surface of the control valve when the particles flow through the control valve along with fuel. When the oil nozzle structure and the control valve are combined in the present stage, as shown in fig. 7, the oil nozzle structure comprises an oil nozzle body 2 and a needle valve 3, wherein the needle valve comprises a needle valve tail part 3-1, a needle valve rod part 3-3 and a lower sealing head 3-2, the oil nozzle body comprises a nozzle body inner cavity 2-1, the nozzle body inner cavity 2-1 comprises an upper pressure chamber 2-4 and a lower sealing cavity 2-2, and the lower sealing head 3-2 is matched with the lower sealing cavity 2-2;
the control valve comprises a valve body 6-1, a valve rod 6-3 and an armature 6-2, a valve cavity is arranged in the valve body, the valve rod is arranged in the valve cavity, a first oil return channel 6-4, a second oil return channel 6-7, a first oil inlet channel 6-8 and a third oil inlet channel 6-9 are further arranged on the valve body, the second oil inlet channel 2-3 is arranged on the oil spray nozzle body 2, the first oil return channel 6-4 and the second oil return channel 6-7 are respectively communicated with the valve cavity, and the third oil inlet channel 6-9 and the second oil inlet channel 2-3 are respectively communicated with the first oil inlet channel 6-8;
the second oil inlet channel 2-3 is communicated with the inner cavity of the nozzle body below the pressure chamber 2-4; the third oil inlet passage 6-9 is communicated with the pressure chamber 2-4;
the diameter of the tail part 3-1 of the needle valve is smaller than that of the rod part 3-3 of the needle valve, and a spring 4 is sleeved on the tail part 3-1 of the needle valve;
the existing oil nozzle is only provided with a lower seal and lacks an upper seal, when the needle valve is completely opened, fuel oil controlled by pressure on the upper part of the needle valve still can drain upwards, the fuel oil flows through a control valve on the upper part of the oil nozzle, and particles in the fuel oil can accelerate the abrasion of the control valve, so that the service life of the oil injector is shortened.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the not enough of above-mentioned prior art existence, provide a can reduce the control valve wearing and tearing, improve the fuel sprayer for high pressure common rail fuel injector in sprayer life-span.
The utility model provides an above-mentioned technical problem's technical scheme as follows: an oil nozzle for a high-pressure common rail oil injector comprises a guide head, an oil nozzle body and a needle valve, wherein an upper sealing cavity is arranged in the guide head, a nozzle body inner cavity is arranged in the oil nozzle body, the lower end of the guide head is inserted into the upper end of the nozzle body inner cavity, a lower sealing cavity is arranged at the lower part of the nozzle body inner cavity, the needle valve can move up and down in the upper sealing cavity and the nozzle body inner cavity, and the needle valve comprises an upper sealing head and a lower sealing head;
the upper part of the guide head is also provided with a first oil return channel which is communicated with the upper sealing cavity;
when the needle valve is positioned at the upper end, the upper sealing head and the upper sealing cavity are sealed, so that the first oil return channel is blocked; when the needle valve is arranged at the lower end, the outer wall of the lower sealing head and the inner wall of the lower sealing cavity are sealed.
Further, when the needle valve is arranged at the lower end, the outer wall of the lower sealing head and the inner wall of the lower sealing cavity are linearly sealed.
Further, the lower sealing head is conical, the lower sealing cavity is a conical cavity, and the cone angle of the lower sealing head is smaller than that of the lower sealing cavity.
Further, the upper sealing head is conical, and the upper sealing cavity is matched with the upper sealing head.
Further, still include spring and spring holder, the spring holder with needle valve fixed connection, the spring housing is located on the needle valve, just the spring is located between spring holder and the direction head.
Further, still be equipped with first oil feed passageway on the uide head, first oil feed passageway with upper portion seal chamber intercommunication.
Furthermore, a second oil inlet channel is further arranged on the guide head and communicated with the inner cavity of the nozzle body.
The utility model has the advantages that: the guide head is provided with an upper sealing cavity, and after the needle valve is lifted upwards, the upper sealing head and the upper sealing cavity are sealed, so that the first oil return channel is sealed, namely after the oil injector is opened, oil cannot be continuously drained from the control valve, the fuel oil on the upper part of the needle valve is prevented from continuously entering the control valve, the abrasion to the control valve is reduced, and the service life of the oil injection nozzle is prolonged.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at B;
FIG. 3 is a schematic view of the present invention in a closed state;
FIG. 4 is a schematic view of the open state of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4 at C;
FIG. 6 is a schematic structural view of a control valve according to the present invention;
FIG. 7 is a schematic view of a prior art fuel injector and control valve configuration when coupled;
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1-6, an oil nozzle for a high-pressure common rail oil injector comprises a guide head 1, an oil nozzle body 2 and a needle valve 3, wherein an upper sealing cavity 1-1 is arranged in the guide head 1, a nozzle body inner cavity 2-1 is arranged in the oil nozzle body 2, the lower end of the guide head 1 is inserted into the upper end of the nozzle body inner cavity 2-1, the nozzle body inner cavity comprises a lower sealing cavity arranged at the lower part, the needle valve 3 can move up and down in the upper sealing cavity 1-1 and the nozzle body inner cavity 2-1, the needle valve 3 comprises an upper sealing head 3-1 and a lower sealing head 3-2, and a needle valve rod part 3-3 is arranged between the upper sealing head 3-1 and the lower sealing head 3-2;
the upper part of the guide head 1 is also provided with a first oil return channel 1-4, and the first oil return channel 1-4 is communicated with the upper sealing cavity 1-1;
when the needle valve 3 is positioned at the upper end, the upper sealing head 3-1 and the upper sealing cavity 1-1 are linearly sealed, so that the first oil return channel 1-4 is blocked; when the needle valve 3 is arranged at the lower end, the outer wall of the lower sealing head 3-2 and the inner wall of the lower sealing cavity 2-2 are linearly sealed.
The lower sealing head 3-2 is conical, the lower sealing cavity 2-2 is a conical cavity, and the cone angle of the lower sealing head 3-2 is smaller than that of the lower sealing cavity 2-2; the upper sealing head 3-1 is conical, and the upper sealing cavity 1-1 is matched with the upper sealing head 3-1.
Still include spring 4 and spring holder 5, spring holder 5 with 3 fixed connection of needle valve, 4 covers of spring are located on the needle valve 3, just spring 4 is located between spring holder 5 and the direction head 1.
The guide head 1 is further provided with a first oil inlet channel 1-5, and the first oil inlet channel 1-5 is communicated with the upper sealing cavity 1-1.
The guide head 1 is also provided with a second oil inlet channel 1-3, and the second oil inlet channel 1-3 is communicated with the inner cavity 2-1 of the nozzle body.
The lower part of the oil spray nozzle body 2 is also provided with oil spray holes 2-4, and the oil spray holes 2-4 are communicated with the inner cavity 2-1 of the nozzle body.
When the oil nozzle is combined with the control valve, as shown in fig. 3-6, the control valve 6 is arranged above the guide head 1 and is fixedly connected with the guide head 1 or can be integrated with the guide head 1, the control valve 6 comprises a valve body 6-1, a valve rod 6-3 and an armature 6-2, the valve body 6-1 is provided with a valve cavity 6-6, the valve rod 6-3 is arranged in the valve cavity 6-6, and the armature 6-2 is fixedly connected with the valve rod 6-3 and is arranged at the upper part of the valve rod 6-3;
the guide head 1 is further provided with a second oil return passage 1-2, the valve body 6-1 is further provided with a third oil return passage 6-4, the first oil return passage 1-4 is communicated with the third oil return passage 6-4, and the third oil return passage 6-4 and the second oil return passage 1-2 are both communicated with the valve cavity 6-6.
The valve body 6-1 is also provided with a third oil inlet channel 6-5, and the third oil inlet channel 6-5 is communicated with the second oil inlet channel 1-3.
The working principle of the utility model is as follows: after an electromagnetic coil in the oil sprayer is electrified, the armature 6-2 drives the valve rod 6-3 to move upwards, the first oil return channel 1-4, the third oil return channel 6-4 and the second oil return channel 1-2 are communicated, oil is drained from the upper part of the needle valve 3, the pressure of the upper part is reduced, the needle valve 3 moves upwards, and an oil nozzle sprays oil; after an electromagnetic coil in the oil sprayer is powered off, the pressure of the upper sealing cavity 1-1 is increased, the needle valve 3 is driven to move downwards by combining the acting force of the spring 4, the lower sealing head 3-2 seals the lower sealing cavity, and the oil spraying nozzle stops spraying oil.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (7)
1. An oil nozzle for a high-pressure common rail oil injector is characterized by comprising a guide head, an oil nozzle body and a needle valve, wherein an upper sealing cavity is arranged in the guide head, a nozzle body inner cavity is arranged in the oil nozzle body, the lower end of the guide head is inserted into the upper end of the nozzle body inner cavity, a lower sealing cavity is arranged at the lower part of the nozzle body inner cavity, the needle valve can move up and down in the upper sealing cavity and the nozzle body inner cavity, and the needle valve comprises an upper sealing head and a lower sealing head;
the upper part of the guide head is also provided with a first oil return channel which is communicated with the upper sealing cavity;
when the needle valve is positioned at the upper end, the upper sealing head and the upper sealing cavity are sealed, so that the first oil return channel is blocked; when the needle valve is arranged at the lower end, the outer wall of the lower sealing head and the inner wall of the lower sealing cavity are sealed.
2. The fuel injector of claim 1, wherein the outer wall of the lower seal head linearly seals against the inner wall of the lower seal cavity when the needle valve is at the lower end.
3. The fuel injector of claim 2, wherein the lower seal head is conical, the lower seal cavity is a conical cavity, and a taper angle of the lower seal head is smaller than a taper angle of the lower seal cavity.
4. The fuel injector of claim 1, wherein the upper seal head is conical, and the upper seal cavity is adapted to the upper seal head.
5. The fuel injection nozzle for the high-pressure common rail fuel injector according to any one of claims 1 to 4, further comprising a spring and a spring seat, wherein the spring seat is fixedly connected with the needle valve, the spring is sleeved on the needle valve, and the spring is arranged between the spring seat and the guide head.
6. The fuel injector as claimed in any one of claims 1 to 4, wherein a first fuel inlet passage is provided in the pilot head, and the first fuel inlet passage communicates with the upper seal chamber.
7. The fuel injector of claim 6, wherein the pilot head further comprises a second fuel inlet channel, and the second fuel inlet channel is communicated with the nozzle body inner cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020839283.XU CN212376771U (en) | 2020-05-19 | 2020-05-19 | Oil nozzle for high-pressure common rail oil injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020839283.XU CN212376771U (en) | 2020-05-19 | 2020-05-19 | Oil nozzle for high-pressure common rail oil injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212376771U true CN212376771U (en) | 2021-01-19 |
Family
ID=74178239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020839283.XU Active CN212376771U (en) | 2020-05-19 | 2020-05-19 | Oil nozzle for high-pressure common rail oil injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212376771U (en) |
-
2020
- 2020-05-19 CN CN202020839283.XU patent/CN212376771U/en active Active
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