CN210919310U - Plunger type oil sprayer - Google Patents
Plunger type oil sprayer Download PDFInfo
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- CN210919310U CN210919310U CN201922129881.8U CN201922129881U CN210919310U CN 210919310 U CN210919310 U CN 210919310U CN 201922129881 U CN201922129881 U CN 201922129881U CN 210919310 U CN210919310 U CN 210919310U
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- fuel injection
- compression spring
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Abstract
The utility model discloses a plunger type fuel injector, including the injector body, fuel sprayer and needle valve. According to the plunger type oil sprayer disclosed by the scheme, fuel oil enters the second fuel oil injection oil passage through the first fuel oil injection oil passage, the fuel oil enters the oil injection end of the oil injection hole through the second fuel oil injection oil passage, when the oil pressure of the oil injection end of the oil injection hole is larger than the elastic force of the compression spring on the valve needle, the valve needle is pushed by the fuel oil to continuously compress the compression spring, the oil injection hole is opened at the moment, the fuel oil is sprayed to a combustion chamber of an engine, and high-temperature and high-pressure gas in the combustion chamber cannot enter the plunger type oil sprayer because the oil injection hole is always blocked by the high; and stopping supplying oil to the first fuel oil injection oil passage, wherein the oil pressure of the oil injection end of the oil injection hole is smaller than the elastic force of the compression spring to the needle valve, and the compression spring pushes the needle valve to block the oil injection hole so as to prevent the fuel oil in the plunger type oil injector from dropping in the combustion chamber.
Description
Technical Field
The utility model relates to the technical field of engines, in particular to plunger type sprayer.
Background
The fuel injector is a device which can receive fuel injection pulse signals transmitted by the ECU and accurately control the fuel injection quantity.
Aiming at the plunger type oil sprayer, an oil spraying passage of the plunger type oil sprayer is directly connected with a combustion chamber of an engine, high-temperature and high-pressure gas in a cylinder of the combustion chamber enters the plunger type oil sprayer to cause the failure of the plunger type oil sprayer, and fuel oil in the plunger type oil sprayer drops in the combustion chamber after the engine is stopped to cause the black smoke when the engine is started next time.
Therefore, how to avoid the plunger type fuel injector failure caused by the high-temperature and high-pressure gas in the combustion chamber entering the plunger type fuel injector and the black smoke generated when the engine is restarted caused by the fuel oil dropping in the combustion chamber becomes a technical problem to be solved by the technical staff in the field.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a plunger type fuel injector to avoid the high temperature high pressure gas in the combustion chamber to get into the plunger type fuel injector and cause the plunger type fuel injector to become invalid, and the fuel drippage in the plunger type fuel injector causes the engine to emit black cigarette when restarting in the combustion chamber.
In order to achieve the above object, the utility model provides a following technical scheme:
a plunger-type fuel injector comprising:
the fuel injector comprises a fuel injector body, a fuel injector body and a fuel injector, wherein the fuel injector body is provided with a first fuel injection oil duct;
the oil injection nozzle is connected with the oil injector body, an oil injection hole and a second fuel injection oil duct are arranged on the oil injection nozzle, the oil injection hole penetrates through the axis of the oil injection nozzle, two ends of the second fuel injection oil duct are respectively communicated with an oil injection end of the oil injection hole and the first fuel injection oil duct, and the oil injection hole is communicated with the mounting cavity;
the needle valve, the needle valve includes needle and compression spring, compression spring can make the needle follows injection port reciprocating motion, the needle sets up in the injection port and can the shutoff the injection port, compression spring sets up the installation intracavity, compression spring's first end with the needle offsets, compression spring's second end is fixed in the installation intracavity.
Preferably, in the plunger type injector, the needle valve further includes a stopper connected to the first end of the compression spring and capable of abutting against the needle.
Preferably, in the plunger type fuel injector, the stopper includes a baffle plate and a connecting column, the baffle plate can abut against the first end of the needle valve, and the connecting column is connected to the first end of the compression spring.
Preferably, in the plunger type injector described above, the second fuel injection oil passage is an inclined oil passage;
the diameter of the needle valve close to one end of the compression spring is larger than the diameter of the needle valve far away from one end of the compression spring, a conical transition inclined plane is arranged at the joint of the end of the needle valve with larger diameter and the end of the needle valve with smaller diameter,
the first end of the needle valve and the wall of the oil injection hole form a third fuel injection oil passage,
the conical transition inclined plane and the hole wall of the oil injection hole form a fourth fuel injection oil passage, and two ends of the fourth fuel injection oil passage are respectively communicated with the third fuel injection oil passage and the second fuel injection oil passage.
Preferably, in the plunger type injector described above, the fourth fuel injection oil passage is an equal-thickness fuel injection oil passage, and the thickness of the fourth fuel injection oil passage is larger than the thickness of the third fuel injection oil passage.
Preferably, in the plunger type injector described above, a diameter of the second fuel injection oil passage is not smaller than a diameter of the fourth fuel injection oil passage.
Preferably, in the plunger type injector described above, the length of the third fuel injection oil passage is at least half of the length of the needle valve.
Preferably, in the plunger type fuel injector, an end of the valve needle close to the compression spring is provided with a guide rod, the guide rod is arranged coaxially with the valve needle, the diameter of the guide rod is smaller than that of the valve needle, one end of the guide rod is connected with the valve needle, the other end of the guide rod is abutted against the stopper,
and one end of the oil nozzle, which is close to the oil injector body, is provided with a guide hole matched with the guide rod.
Preferably, in the plunger type injector, the needle is integrally connected to the guide rod.
According to the above technical scheme, the utility model provides a plunger type sprayer, including the injector body, fuel sprayer and needle valve. According to the plunger type oil sprayer disclosed by the scheme, fuel oil enters the second fuel oil injection oil passage through the first fuel oil injection oil passage, the fuel oil enters the oil injection end of the oil injection hole through the second fuel oil injection oil passage, when the oil pressure of the oil injection end of the oil injection hole is larger than the elastic force of the compression spring on the valve needle, the valve needle is pushed by the fuel oil to continuously compress the compression spring, the oil injection hole is opened at the moment, the fuel oil is sprayed to a combustion chamber of an engine, and high-temperature and high-pressure gas in the combustion chamber cannot enter the plunger type oil sprayer because the oil injection hole is always blocked by the high; and stopping supplying oil to the first fuel oil injection oil passage, wherein the oil pressure of the oil injection end of the oil injection hole is smaller than the elastic force of the compression spring to the needle valve, and the compression spring pushes the needle valve to block the oil injection hole so as to prevent the fuel oil in the plunger type oil injector from dropping in the combustion chamber, thereby avoiding the phenomenon that the engine emits black smoke when the engine is restarted due to the fact that the fuel oil in the plunger type oil injector drops in the combustion chamber.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a plunger-type fuel injector according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fuel injection nozzle of the plunger type fuel injector provided by the present invention;
fig. 3 is a right side view of a plunger type fuel injector according to an embodiment of the present invention.
Wherein the content of the first and second substances,
1. the fuel injection device comprises a fuel injector body, 11, a first fuel injection oil channel, 2, a fuel injection nozzle, 21, a second fuel injection oil channel, 3, a needle valve, 31, a needle valve, 32, a compression spring, 33, a stop block, 331, a baffle plate, 332, a connecting column, 34, a guide rod, 4, a third fuel injection oil channel, 5 and a fourth fuel injection oil channel.
Detailed Description
The utility model discloses a plunger type fuel injector to cause the plunger type fuel injector to become invalid in avoiding the high temperature high pressure gas in the combustion chamber to get into the plunger type fuel injector, and the fuel drippage in the plunger type fuel injector causes the engine to emit black smoke when restarting in the combustion chamber.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model discloses a plunger type fuel injector, including injector body 1, fuel sprayer 2 and needle valve 3.
Preferably, the injector body 1, the injector nozzle 2 and the needle valve 3 are made of metal materials.
The injector body 1 is provided with a first fuel injection oil passage 11, the first fuel injection oil passage 11 can be filled with fuel oil, and the fuel oil is injected to a combustion chamber of an engine through a plunger type injector.
The injector body 1 is also provided with a mounting cavity for mounting a compression spring 32 of the needle valve 3.
As shown in fig. 1, a mounting cavity is opened in the axial direction of the injector body 1, and a first fuel injection oil passage 11 is provided at one side of the mounting cavity.
The fuel injection nozzle 2 is connected with the fuel injector body 1, and a fuel injection hole and a second fuel injection oil passage 21 are arranged on the fuel injection nozzle 2.
As shown in fig. 1, the oil injection hole is formed along the axial direction of the oil injection nozzle 2, a first end of the oil injection hole is communicated with a combustion chamber of an engine, and a second end of the oil injection hole is communicated with the mounting cavity.
It should be noted here that the first end of the oil injection hole is an end where the oil injection port is disposed, that is, an end communicating with a combustion chamber of the engine, and the second end of the oil injection hole is an end away from the combustion chamber of the engine.
As shown in fig. 1, one end of the second fuel injection oil passage 21 communicates with the injection hole, and the other end communicates with the first fuel injection oil passage 11. The oil of the first fuel injection oil passage 11 can enter the second fuel injection oil passage 21.
The needle valve 3 includes a needle 31 and a compression spring 32. As shown in fig. 1 and 3, the needle valve 3 is disposed in the oil injection hole, the tip end of the needle valve 3 can be matched with the first end of the oil injection hole to block the first end of the oil injection hole, and the end of the needle valve 3 opposite to the tip end abuts against the compression spring 32 through the second end of the oil injection hole.
The compression spring 32 can linearly reciprocate the needle 31 along the injection hole, thereby opening or closing the injection hole. As shown in fig. 1, a first end of the compression spring 32 abuts the valve needle 31, and a second end is fixed in the mounting cavity.
Here, the first end of the compression spring 32 is an end that can be abutted against the needle 31, and the second end of the compression spring 32 is an end that does not abut against the needle 31.
The connection (not shown) of the second end of the compression spring 32 to the mounting cavity may be an abutment, a weld or a snap.
According to the plunger type oil sprayer disclosed by the scheme, fuel oil enters the second fuel oil injection oil duct 21 through the first fuel oil injection oil duct 11, the fuel oil enters the oil injection end of the oil injection hole through the second fuel oil injection oil duct 21, when the oil pressure of the oil injection end of the oil injection hole is larger than the elastic force of the compression spring 32 on the valve needle 31, the valve needle 31 is pushed by the fuel oil to continuously compress the compression spring 32, the oil injection hole is opened at the moment, the fuel oil is sprayed to a combustion chamber of an engine, and high-temperature and high-pressure gas in the combustion chamber cannot enter the plunger type oil sprayer because the oil injection hole is always blocked by high-pressure; the supply of the fuel to the first fuel injection oil passage 11 is stopped, the oil pressure at the fuel injection end of the fuel injection hole is smaller than the elastic force of the compression spring 32 to the needle valve 3, the compression spring 32 pushes the needle 31 to block the fuel injection hole, and the fuel in the plunger type fuel injector is prevented from dropping in the combustion chamber, so that the phenomenon that the black smoke is generated when the engine is restarted due to the dropping of the fuel in the plunger type fuel injector in the combustion chamber is avoided.
In order to further optimize the above technical solution, the needle valve 3 disclosed in this embodiment further includes a stopper 33. As shown in fig. 1, the stopper 33 is located between the needle 31 and the compression spring 32, and the stopper 33 is connected to a first end of the compression spring 32.
The design of the stop 33 increases the contact area between the valve needle 31 and the compression spring 32, ensures that the elastic force of the compression spring 32 can effectively act on the valve needle 31, and improves the working stability of the plunger type fuel injector.
As shown in fig. 1, in an embodiment of the present disclosure, the stopper 33 includes a blocking plate 331 and a connecting post 332, the blocking plate 331 is located at one end of the connecting post 332, and the connecting post 332 is sleeved with the compression spring 32. Specifically, one end of the blocking plate 331 can abut against the valve needle 31, and the other end is connected to the connecting column 332.
Preferably, the connecting column 332 is in interference fit with the compression spring 32 to ensure the connection strength between the connecting column 332 and the compression spring 32, and correspondingly, the diameter of the baffle 331 is larger than the diameters of the compression spring 32 and the connecting column 332 to ensure the stable fit between the stopper 33 and the valve needle 31.
Preferably, the shield 331 is integrally formed with the connecting post 332.
In one embodiment of the present disclosure, the stopper 33 is a metal stopper, which ensures that the stopper 33 can stably operate in a high temperature environment of the engine.
Preferably, the baffle 331 is a circular baffle, conforming to the cross-sectional shape of the mounting cavity. The baffle 331 may also be other shapes of the baffle 331, such as a rectangle, triangle, diamond, or other polygon, which is not limited herein.
As shown in fig. 1 and 2, the second fuel injection oil passage 21 is an inclined oil passage, a first end of which communicates with the first fuel injection oil passage 11, and a second end of which communicates with the middle portion of the oil jet hole.
In this scheme, the one end of the name needle 31 of keeping away from compression spring 32 is the first end of needle 31, and the one end that is close to compression spring 32 of needle 31 is the second end of needle 31, and the first end cooperation of the first end of needle 31 and the first end of injection port, and the second end cooperation of the second end of needle 31 and the second end of injection port.
In the present embodiment, the valve needle 31 has a size difference in the axial direction, specifically, the diameter of the first end of the valve needle 31 is smaller than the diameter of the second end of the valve needle 31, and a conical transition inclined surface is provided between the first end of the needle valve 3 and the second end of the needle valve 3.
As shown in fig. 1, the length of the first end of valve needle 31 is at least half of the overall length of valve needle 31, and the length of the second end of valve needle 31 is less than half of the overall length of valve needle 31.
The first end of the valve needle 31 and the hole wall of the injection hole form a third fuel injection oil passage 4, the conical transition inclined surface and the hole wall of the injection hole form a fourth fuel injection oil passage 5, the second end of the valve needle 31 is in clearance fit with the hole wall of the injection hole, and a clearance between the second end of the valve needle 31 and the hole wall of the injection hole is small enough, a small amount of fuel can enter the clearance, but the oil pressure of the third fuel injection oil passage 4 and the fourth fuel injection oil passage 5 is not affected.
The fuel oil in the first fuel oil injection oil passage 11 enters the second fuel oil injection oil passage 21, then enters the fourth fuel oil injection oil passage 5 through the second fuel oil injection oil passage 21, finally enters the third fuel oil injection oil passage 4 and then is ejected through an oil jet of an oil jet hole.
In this scheme, the nozzle hole is used for installing needle 31, and the pore wall of nozzle hole and the outer wall of the first end of needle 31 form third fuel injection oil duct 4 and fourth fuel injection oil duct 5, and the fuel forms high-pressure fuel in third fuel injection oil duct 4 and fourth fuel injection oil duct 5, spouts the nozzle at last.
In the scheme, the volumes of the third fuel injection oil passage 4 and the fourth fuel injection oil passage 5 are relatively increased, the high-pressure fuel quantity is increased, and the pressure of the high-pressure fuel can be greater than the elastic force of the compression spring 32 on the valve rod, so that the plunger type oil sprayer can effectively work.
As shown in fig. 1, the fourth fuel injection oil passage 5 is an equal-thickness fuel injection oil passage, and the thickness of the fourth fuel injection oil passage 5 is greater than the thickness of the third fuel injection oil passage 4. The fourth fuel injection oil passage 5 and the third fuel injection oil passage 4 are both annular fuel injection oil passages, and after the fuel oil in the fourth fuel injection oil passage 5 is injected into the third fuel injection oil passage 4, the fuel oil pressure is correspondingly increased due to the fact that the sizes of the oil passages are reduced, and the fact that the valve rod can be smoothly jacked open by the fuel oil is guaranteed.
It should be noted here that the thickness of the third fuel injection oil passage 4 and the thickness of the fourth fuel injection oil passage 5 are both thicknesses perpendicular to the axial direction of the fuel injection nozzle 2.
As shown in fig. 1, the diameter of the second fuel injection oil passage 21 is not smaller than the diameter of the fourth fuel injection oil passage 5. Specifically, the diameter of the second fuel injection oil passage 21 is equal to the diameter of the fourth fuel injection oil passage 5, or the diameter of the second fuel injection oil passage 21 is larger than the diameter of the fourth fuel injection oil passage 5.
In the embodiment where the diameter of the second fuel injection oil passage 21 is greater than the diameter of the fourth fuel injection oil passage 5, after the fuel oil in the second fuel injection oil passage 21 enters the fourth fuel injection oil passage 5, the pressure of the fuel oil will be rapidly reduced because the fourth fuel injection oil passage 5 is an annular fuel injection oil passage, and the diameter of the second fuel injection oil passage 21 is designed to be greater than the diameter of the fourth fuel injection oil passage 5, so that such pressure jump can be reduced, and the stability of the operation of the plunger type injector can be improved.
In order to further optimize the technical scheme, in the scheme, a guide rod 34 is arranged at one end, close to the compression spring 32, of the valve needle 31, the guide rod 34 is coaxially arranged with the valve needle 31, one end of the guide rod 34 abuts against the valve needle 31, and the other end of the guide rod abuts against the stop 33.
As shown in fig. 1, the diameter of the guide rod 34 is smaller than that of the needle 31, and one end of the fuel injection nozzle 2 close to the injector body 1 is provided with a guide hole which is in reduced fit with the guide rod 34.
In operation, the guide rod 34 slides back and forth along the guide hole.
Preferably, the valve needle 31 is integrally formed with the guide rod 34 to reduce the manufacturing difficulty and the processing cost of the needle valve 3.
The valve needle 31 and the guide rod 34 may also be designed as separate structures, and in this embodiment, the valve needle 31 and the guide rod 34 are welded or bolted.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A plunger-type fuel injector, comprising:
the fuel injection device comprises a fuel injector body (1) provided with a first fuel injection oil duct (11), wherein an installation cavity is arranged in the fuel injector body (1);
the oil injection nozzle (2) is connected with the oil injector body (1), an oil injection hole and a second fuel injection oil duct (21) are formed in the oil injection nozzle (2), the oil injection hole penetrates through the axis of the oil injection nozzle (2) to be formed, two ends of the second fuel injection oil duct (21) are respectively communicated with an oil injection end of the oil injection hole and the first fuel injection oil duct (11), and the oil injection hole is communicated with the installation cavity;
needle valve (3), needle valve (3) are including needle (31) and compression spring (32), compression spring (32) can make needle (31) are followed injection port reciprocating motion, needle (31) set up in the injection port and can the shutoff the injection port, compression spring (32) set up in the installation cavity, the first end of compression spring (32) with needle (31) offset, the second end of compression spring (32) is fixed in the installation cavity.
2. The plunger injector according to claim 1, characterized in that the needle valve (3) further comprises a stopper (33), the stopper (33) being connected with the first end of the compression spring (32) and being capable of abutting against the valve needle (31).
3. A plunger injector as claimed in claim 2, characterised in that the stop (33) comprises a baffle (331) and a connecting post (332), the baffle (331) being adapted to abut against a first end of the needle valve (3), the connecting post (332) being connected to a first end of the compression spring (32).
4. The plunger type injector according to claim 1, characterized in that the second fuel injection oil passage (21) is an inclined oil passage;
the diameter of the needle valve (3) close to one end of the compression spring (32) is larger than the diameter of the needle valve (3) far away from one end of the compression spring, a conical transition inclined plane is arranged at the joint of the end with the larger diameter of the needle valve (3) and the end with the smaller diameter of the needle valve (3),
a third fuel oil injection oil passage (4) is formed by the first end of the needle valve (3) and the hole wall of the oil injection hole,
the conical transition inclined plane and the hole wall of the oil injection hole form a fourth fuel injection oil duct (5), and two ends of the fourth fuel injection oil duct (5) are respectively communicated with the third fuel injection oil duct (4) and the second fuel injection oil duct (21).
5. A plunger type injector according to claim 4, characterized in that the fourth fuel injection oil passage (5) is an equal-thickness fuel injection oil passage, and the thickness of the fourth fuel injection oil passage (5) is larger than the thickness of the third fuel injection oil passage (4).
6. The plunger type injector according to claim 4, characterized in that the diameter of the second fuel injection oil passage (21) is not smaller than the diameter of the fourth fuel injection oil passage (5).
7. The plunger type fuel injector according to claim 4, characterized in that the length of the third fuel injection oil passage (4) is at least half of the length of the needle valve (3).
8. A plunger injector as set forth in claim 2 characterized in that the end of the valve needle (31) close to the compression spring (32) is provided with a guide rod (34), the guide rod (34) is arranged coaxially with the valve needle (31), and the guide rod (34) has a smaller diameter than the valve needle (31), one end of the guide rod (34) is connected with the valve needle (31) and the other end abuts against the stopper (33),
and one end of the oil nozzle (2) close to the oil injector body (1) is provided with a guide hole matched with the guide rod (34).
9. A plunger injector as set forth in claim 8 characterized in that the valve needle (31) is integrally connected with the guide rod (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922129881.8U CN210919310U (en) | 2019-11-29 | 2019-11-29 | Plunger type oil sprayer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922129881.8U CN210919310U (en) | 2019-11-29 | 2019-11-29 | Plunger type oil sprayer |
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| Publication Number | Publication Date |
|---|---|
| CN210919310U true CN210919310U (en) | 2020-07-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922129881.8U Active CN210919310U (en) | 2019-11-29 | 2019-11-29 | Plunger type oil sprayer |
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| CN (1) | CN210919310U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483383A (en) * | 2022-01-28 | 2022-05-13 | 刘义亭 | Gas fuel injector |
-
2019
- 2019-11-29 CN CN201922129881.8U patent/CN210919310U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483383A (en) * | 2022-01-28 | 2022-05-13 | 刘义亭 | Gas fuel injector |
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