CN215408942U - Stroke adjustable is nozzle structure for dual fuel injector - Google Patents
Stroke adjustable is nozzle structure for dual fuel injector Download PDFInfo
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- CN215408942U CN215408942U CN202121185846.9U CN202121185846U CN215408942U CN 215408942 U CN215408942 U CN 215408942U CN 202121185846 U CN202121185846 U CN 202121185846U CN 215408942 U CN215408942 U CN 215408942U
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Abstract
The utility model provides a nozzle structure for a stroke-adjustable dual-fuel injector, which comprises an injector body, an intermediate body, a valve body, an inner needle and an outer needle, wherein the intermediate body is arranged between the injector body and the valve body; the injector body, the middle body and the valve body are tightly matched together through a tightening cap from top to bottom; the inner needle and the outer needle are coaxially arranged in the valve body from inside to outside and can move along respective central axes; the adjusting block is arranged at the top of the outer needle, a first adjusting spring is arranged between the outer needle and the intermediate body, a second adjusting spring is arranged between the bottom of the adjusting block and the inner needle, and the stroke of the inner needle and the stroke of the outer needle are adjusted by changing the length of the adjusting block exposed out of the top of the outer needle. The utility model has the advantages of adjustable stroke of the outer needle and the inner needle, compact structure, circumferential limit function of the outer needle and guarantee of injection stability.
Description
Technical Field
The utility model relates to an engine injector fitting, in particular to a nozzle structure for a stroke-adjustable dual-fuel injector.
Background
With the upgrade of national emission regulations, natural gas is used as one of the alternative fuels, and due to the better cleanness and economy, the gas vehicle is rapidly developed in the traffic direction in recent years, and the sales volume of the gas vehicle is gradually increased.
The existing natural gas engine mainly adopts low-pressure manifold injection, the heat value efficiency is low, the exhaust temperature is high, diesel oil and natural gas are directly injected into a combustion chamber at high pressure of 300bar by using a dual-fuel injector through an HPDI technology, a small amount of diesel oil is used for ignition, and then 95% of natural gas is injected to be used as main fuel for combustion to do work.
The nozzle structure that present dual fuel injector used is more complicated, can't adjust the motion stroke of outer needle and inner needle according to the needs of injection flow to inner needle and outer needle produce the side force when the injection easily, and wearing and tearing are comparatively serious.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides the nozzle structure for the dual-fuel injector with the adjustable stroke, the stroke of the inner needle and the stroke of the outer needle can be adjusted according to the requirement, the movement stability of the inner needle and the outer needle is good, the abrasion can be effectively reduced, and the service life is prolonged. The technical scheme adopted by the utility model is as follows:
a nozzle structure for a stroke-adjustable dual-fuel injector comprises an injector body, an intermediate body, a valve body, an inner needle and an outer needle;
the injector body, the middle body and the valve body are tightly matched together through a tightening cap from top to bottom;
the inner needle and the outer needle are coaxially arranged in the valve body from inside to outside and can move along respective central axes;
the adjusting block is arranged at the top of the outer needle, a first adjusting spring is arranged between the outer needle and the intermediate body, a second adjusting spring is arranged between the bottom of the adjusting block and the inner needle, and the stroke of the inner needle and the stroke of the outer needle are adjusted by changing the length of the adjusting block exposed out of the top of the outer needle.
Furthermore, a first pressure cavity is formed in the bottom of the intermediate body, a second pressure cavity is formed inside the outer needle and between the inner needle and the adjusting block, the first adjusting spring is arranged in the first pressure cavity, and the second adjusting spring is arranged in the second pressure cavity.
Further, the adjusting block is in threaded connection with the outer needle.
Furthermore, the top of the outer needle is provided with a limiting part in an outward expansion mode, and the bottom of the first pressure cavity is provided with a first limiting cavity matched with the limiting part in an outward expansion mode.
Furthermore, the top of the inner needle and the top of the adjusting block are spherical.
Further, a fuel supply channel is arranged on the injector body, and a first fuel control channel for communicating the fuel supply channel with the first pressure cavity is arranged at the top of the intermediate body;
an oil outlet hole capable of being communicated with the outside is formed in the first pressure cavity.
Furthermore, the intermediate body is provided with an intermediate body first fuel injection passage communicated with the fuel supply passage;
the valve body is provided with a valve body first fuel injection channel communicated with one end of the intermediate body first fuel injection channel, the outer needle is provided with an outer needle first fuel injection channel communicated with the valve body first fuel injection channel, and a first fuel injection cavity is arranged in the outer needle and positioned outside the inner needle;
second fuel control channel butt-joint sections are arranged at one ends of the outer needle and the intermediate body first injection channel, and a second fuel control channel is arranged between the two second fuel control channel butt-joint sections on the valve body;
an oil outlet hole capable of being communicated with the outside is formed in the second pressure cavity.
Further, the lower side in the outer needle is inwards shrunk to form a first fuel receiving part matched with the lower end of the inner needle, and a plurality of first fuel injection ports are circumferentially arranged at the bottom of the outer needle.
Further, a second fuel injection cavity is formed between the inside of the valve body and the outer side of the outer needle, the lower side of the inside of the valve body is inwards shrunk to form a second fuel receiving part matched with the lower end of the outer needle, and a plurality of second fuel injection ports are circumferentially arranged at the bottom of the valve body.
The utility model has the advantages that:
the dual-fuel independent injection is realized, the movement strokes of the inner needle and the outer needle are flexibly adjusted, the application range is wider, the structure is compact, and no external space is occupied;
the spherical shape design of the inner needle and the adjusting block is matched with the motion trail of the central axis of the inner needle and the adjusting block, so that the generation of lateral force of the inner needle and the outer needle when the planes are contacted is avoided, and the influence of deflection of the inner needle or the outer needle on the injection quality is reduced;
the outer needle direction sets up in inside, reduces occupation space, also can reduce the processing degree of difficulty of each spare part to a certain extent, can also guarantee the relative position of first fuel jet and second fuel jet for the contained angle of two jets is unanimous.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a partially enlarged view of a portion a in fig. 1.
Fig. 3 is a partially enlarged view of fig. 1 at B.
In the figure: 1-injector body, 2-intermediate body, 3-locking cap, 4-valve body, 5-inner needle, 6-outer needle, 7-adjusting block, 8-first adjusting spring, 9-second adjusting spring, 10-first adjusting gasket, 11-second adjusting gasket, 101-fuel supply channel, 201-first pressure chamber, 202-first limit chamber, 203-first fuel control channel, 204-intermediate body first fuel injection channel, 401-valve body first fuel injection channel, 402-second fuel control channel butt-joint section, 403-second fuel injection chamber, 404-second fuel receiving port, 405-second fuel injection port, 601-second pressure chamber, 602-limit portion, 603-outer needle first fuel injection channel, 604-first fuel injection cavity, 605-first fuel receiving portion, 606-first fuel injection port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1, the utility model provides a nozzle structure for a dual fuel injector with adjustable stroke, which comprises an injector body 1, an intermediate body 2, a valve body 4, an inner needle 5 and an outer needle 6;
the injector body 1, the intermediate body 2 and the valve body 4 are tightly matched together through a tight cap 3 from top to bottom; the intermediate body 2 and the valve body 4 are wrapped by the tightening cap 3, so that the occupied space is effectively reduced, and the intermediate body 2 and internal parts can be protected;
the inner needle 5 and the outer needle 6 are coaxially arranged in the valve body 4 from inside to outside and can move along respective central axes; the outer diameter of the inner needle 5 is approximately equal to the inner diameter of the outer needle 6, the outer diameter of the outer needle 6 is approximately equal to the inner diameter of the valve body 4, the motion tracks of the inner needle 5 and the outer needle 6 can be limited, and the purpose of primary deviation prevention is achieved.
The top of the outer needle 6 is provided with an adjusting block 7, a first adjusting spring 8 is arranged between the outer needle 6 and the middle body 2, a second adjusting spring 9 is arranged between the bottom of the adjusting block 7 and the inner needle 5, and the pretightening force of the second adjusting spring 9 and the strokes of the inner needle 5 and the outer needle 6 are adjusted by changing the length of the adjusting block 7 exposed out of the top of the outer needle 6.
Referring to fig. 2, a first pressure chamber 201 is disposed at the bottom of the middle body 2, a second pressure chamber 601 is formed inside the outer needle 6 and between the inner needle 5 and the adjusting block 7, the first adjusting spring 8 is disposed in the first pressure chamber 201, and the second adjusting spring 9 is disposed in the second pressure chamber 601; the elastic force of the first adjusting spring 8 or the second adjusting spring 9 is counteracted through the control of the pressure in the first pressure chamber 201 or the second pressure chamber 601, the purpose of the movement of the outer needle 6 or the inner needle 5 is achieved, and then the injection of the second fuel or the first fuel is realized.
In some embodiments, a first adjusting shim 10 is arranged between the first adjusting spring 8 and the outer needle 6, and a second adjusting shim 11 is arranged between the second adjusting spring 9 and the adjusting block 7; reduce the direct contact between the spare part through setting up the adjusting shim, be favorable to reducing wearing and tearing, simultaneously can be through the pretightning force that sets up the first adjusting spring 8 of altitude mixture control or the second adjusting spring 9 of gasket.
In some embodiments, the adjusting block 7 is screwed with the outer needle 6, and the screwed adjusting block 7 is convenient to adjust and is not easy to separate from the outer needle 6.
In order to limit the motion track of the outer needle 6, the top of the outer needle 6 is provided with a limiting part 602 in an outward expansion manner, and the bottom of the first pressure cavity 201 is provided with a first limiting cavity 202 in an outward expansion manner, wherein the first limiting cavity is matched with the limiting part 602; when the outer needle 6 moves in the valve body 4, in order to ensure that the first fuel supply does not deflect due to the rotation of the outer needle 6, the limiting part 602 slides along the limiting cavity 202, and the stability of the first fuel supply is improved.
In some embodiments, the top of the inner needle 5 and the top of the adjusting block 7 are spherical; the motion of the inner needle 5 and the outer needle 6 is limited by the spherical surface in the injection process, so that the inner needle 5 or the outer needle 6 is prevented from generating lateral force, the inner needle 5 or the outer needle 6 moves along the central axis in a matching way, the abrasion of the matching surface is reduced, and the service life of the whole nozzle structure is prolonged.
Referring to fig. 1 and 2, a fuel supply passage 101 is provided on the injector body 1, and a first fuel control passage 203 for communicating the fuel supply passage 101 with a first pressure chamber 201 is provided at the top of the intermediate body 2;
an oil outlet hole which can be communicated with the outside is formed in the first pressure cavity 201, when fuel in the first pressure cavity 201 is discharged, the pressure in the first pressure cavity 201 is reduced, and the upward hydraulic pressure exerted on the outer needle 6 is greater than the resultant force of the downward hydraulic pressure and the pretightening force of the first adjusting spring 8, so that the outer needle moves upwards;
for better control of the hydraulic pressure in the first pressure chamber 201, a control valve is connected to the oil outlet.
The intermediate body 2 is provided with an intermediate body first fuel injection channel 204 communicated with the fuel supply channel 101; a valve body first fuel injection channel 401 communicated with one end of the intermediate body first fuel injection channel 204 is arranged on the valve body 4, an outer needle first fuel injection channel 603 communicated with the valve body first fuel injection channel 401 is arranged on the outer needle 6, and a first fuel injection cavity 604 is arranged in the outer needle 6 and positioned outside the inner needle 5; a second fuel control channel butt-joint section 402 is arranged at each of the outer needle 6 and one end of the intermediate body first injection channel 204, and a second fuel control channel is arranged between the two second fuel control channel butt-joint sections 402 on the valve body 4;
an oil outlet hole which can be communicated with the outside is formed in the second pressure cavity 601; when the fuel in the second pressure cavity 601 is discharged, the pressure in the second pressure cavity 601 is reduced, and the upward hydraulic pressure applied to the inner needle 5 is greater than the resultant force of the downward hydraulic pressure and the pretightening force of the second adjusting spring 9, so that the inner needle moves upward;
for better control of the hydraulic pressure in the second pressure chamber 601, a control valve is connected to the oil outlet.
Referring to fig. 3, the lower side inside the outer needle 6 is inwardly contracted to form a first fuel receiving portion 605 adapted to the lower end of the inner needle 5, and a plurality of first fuel injection ports 606 are circumferentially arranged at the bottom of the outer needle 6; when the inner needle 5 moves up to be separated from the first fuel receiving portion 605, the first fuel is injected from the first fuel injection ports 606.
A second fuel injection cavity 403 is formed between the inside of the valve body 4 and the outside of the outer needle 6, the lower side of the inside of the valve body 4 is inwards contracted to form a second fuel receiving part 404 matched with the lower end of the outer needle 6, and a plurality of second fuel injection ports 405 are circumferentially arranged at the bottom of the valve body 4; when the outer needle 6 moves up to be separated from the second fuel receiving port portion 404, the second fuel is injected from the second fuel injection port 405.
In some embodiments, the first fuel is a liquid fuel and the second fuel is a liquid fuel or a gaseous fuel.
The working process is as follows:
firstly, adjusting the position of an adjusting block 7 on an outer needle 6 as required, and changing the distance between the top of an inner needle 5 and the adjusting block 7 and the distance between the top of the adjusting block 7 and an intermediate body 2 to adjust the respective strokes;
in the initial state, the first fuel enters the first pressure cavity 201 through the fuel supply channel 101 and the first fuel control channel 203; the second fuel control channel enters a second pressure cavity 601 through the intermediate body first fuel injection channel 204; the fuel enters a first fuel injection cavity 604 through a first fuel injection channel 401 of the valve body and a first fuel injection channel 603 of the outer needle and is blocked by a first fuel receiving part 605, at the moment, the hydraulic pressure in a first pressure cavity 201 and a second pressure cavity 601 is similar to rail pressure, the outer needle 6 is tightly pressed on the valve body 4 under the action of the pretightening force of a first adjusting spring 8 and the hydraulic pressure of the first pressure cavity 201, and the inner needle 5 is tightly pressed on the outer needle 6 under the action of the pretightening force of a second adjusting spring 9 and the hydraulic pressure of the second pressure cavity 601;
the second fuel enters the second fuel injection chamber 403 and is blocked by the second fuel receiving portion 404;
when the control valve communicated with the oil outlet of the second pressure chamber 601 is opened and the pressure in the second pressure chamber 601 is reduced to a set value, the hydraulic pressure of the first fuel injection chamber 604 applied to the inner needle 5 is greater than the resultant force of the hydraulic pressure in the second pressure chamber 601 and the second adjusting spring 9, so that the inner needle 5 moves upwards to be separated from the first fuel receiving part 605, and is stopped when the inner needle abuts against the adjusting block 7, and then the first fuel is injected through the first fuel injection port 606.
When the control valve communicated with the oil outlet of the first pressure chamber 201 is opened and the pressure in the first pressure chamber 201 is reduced to a set value, the hydraulic pressure of the second fuel injection chamber 403 applied to the outer needle 6 is greater than the resultant force of the hydraulic pressure in the first pressure chamber 201 and the first adjusting spring 8, so that the outer needle 6 moves upwards to be separated from the second fuel receiving part 404 and is stopped when the outer needle abuts against the intermediate body 2, and then the second fuel is injected through the second fuel injection port 405.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. A stroke adjustable is nozzle structure for dual fuel injector which characterized in that: comprises an injector body (1), an intermediate body (2), a valve body (4), an inner needle (5) and an outer needle (6);
the injector body (1), the intermediate body (2) and the valve body (4) are tightly matched together through a tightening cap (3) from top to bottom;
the inner needle (5) and the outer needle (6) are coaxially arranged in the valve body (4) from inside to outside and can move along respective central axes;
the needle adjusting device is characterized in that an adjusting block (7) is installed at the top of the outer needle (6), a first adjusting spring (8) is arranged between the outer needle (6) and the intermediate body (2), a second adjusting spring (9) is arranged between the bottom of the adjusting block (7) and the inner needle (5), and the length of the top of the outer needle (6) exposed out of the adjusting block (7) is changed to adjust the stroke of the inner needle (5) and the stroke of the outer needle (6).
2. The adjustable-stroke nozzle structure for dual fuel injectors as claimed in claim 1, characterized in that: the middle body (2) bottom is equipped with first pressure chamber (201) outside needle (6) inside, be located and form second pressure chamber (601) between interior needle (5) and regulating block (7), first regulating spring (8) are located in first pressure chamber (201), second regulating spring (9) are located in second pressure chamber (601).
3. The nozzle structure for a dual fuel injector with adjustable stroke according to claim 1 or 2, characterized in that: the adjusting block (7) is in threaded connection with the outer needle (6).
4. The adjustable-stroke nozzle structure for dual fuel injectors as claimed in claim 2, characterized in that: the top of the outer needle (6) is provided with a limiting part (602) in an outward expansion mode, and the bottom of the first pressure cavity (201) is provided with a first limiting cavity (202) matched with the limiting part (602) in an outward expansion mode.
5. The adjustable-stroke nozzle structure for dual fuel injectors as claimed in claim 2, characterized in that: the top of the inner needle (5) and the top of the adjusting block (7) are spherical.
6. The adjustable-stroke nozzle structure for dual fuel injectors as claimed in claim 2, characterized in that: a fuel supply channel (101) is arranged on the injector body (1), and a first fuel control channel (203) for communicating the fuel supply channel (101) with a first pressure cavity (201) is arranged at the top of the intermediate body (2);
an oil outlet hole capable of being communicated with the outside is formed in the first pressure cavity (201).
7. The adjustable stroke dual fuel injector nozzle construction as claimed in claim 6 wherein: the intermediate body (2) is provided with an intermediate body first fuel injection channel (204) communicated with the fuel supply channel (101);
a valve body first fuel injection channel (401) communicated with one end of the intermediate body first fuel injection channel (204) is arranged on the valve body (4), an outer needle first fuel injection channel (603) communicated with the valve body first fuel injection channel (401) is arranged on the outer needle (6), and a first fuel injection cavity (604) is arranged in the outer needle (6) and positioned outside the inner needle (5);
second fuel control channel butt joint sections (402) are arranged at one ends of the first fuel injection channel (204) of the outer needle (6) and the middle body, and a second fuel control channel is arranged between the two second fuel control channel butt joint sections (402) on the valve body (4);
an oil outlet hole capable of being communicated with the outside is formed in the second pressure cavity (601).
8. The adjustable stroke dual fuel injector nozzle construction as claimed in claim 6 wherein: the lower side in the outer needle (6) is inwards contracted to form a first fuel receiving part (605) matched with the lower end of the inner needle (5), and a plurality of first fuel injection ports (606) are circumferentially arranged at the bottom of the outer needle (6).
9. The adjustable-stroke nozzle structure for dual fuel injectors as claimed in claim 2, characterized in that: a second fuel injection cavity (403) is formed between the inside of the valve body (4) and the outer side of the outer needle (6), the lower side of the inside of the valve body (4) is inwards shrunk to form a second fuel receiving part (404) matched with the lower end of the outer needle (6), and a plurality of second fuel injection ports (405) are circumferentially arranged at the bottom of the valve body (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121185846.9U CN215408942U (en) | 2021-05-28 | 2021-05-28 | Stroke adjustable is nozzle structure for dual fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121185846.9U CN215408942U (en) | 2021-05-28 | 2021-05-28 | Stroke adjustable is nozzle structure for dual fuel injector |
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| Publication Number | Publication Date |
|---|---|
| CN215408942U true CN215408942U (en) | 2022-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121185846.9U Active CN215408942U (en) | 2021-05-28 | 2021-05-28 | Stroke adjustable is nozzle structure for dual fuel injector |
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| CN (1) | CN215408942U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294139A (en) * | 2022-01-25 | 2022-04-08 | 无锡威孚高科技集团股份有限公司 | Dual-fuel injector |
-
2021
- 2021-05-28 CN CN202121185846.9U patent/CN215408942U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294139A (en) * | 2022-01-25 | 2022-04-08 | 无锡威孚高科技集团股份有限公司 | Dual-fuel injector |
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