CN113074069A - Oil sprayer based on two-position three-way principle - Google Patents
Oil sprayer based on two-position three-way principle Download PDFInfo
- Publication number
- CN113074069A CN113074069A CN202110526189.8A CN202110526189A CN113074069A CN 113074069 A CN113074069 A CN 113074069A CN 202110526189 A CN202110526189 A CN 202110526189A CN 113074069 A CN113074069 A CN 113074069A
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- valve
- way
- needle valve
- oil
- throttling hole
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- 239000000446 fuel Substances 0.000 claims abstract description 25
- 230000008878 coupling Effects 0.000 claims abstract description 3
- 238000010168 coupling process Methods 0.000 claims abstract description 3
- 238000005859 coupling reaction Methods 0.000 claims abstract description 3
- 230000004044 response Effects 0.000 abstract description 9
- 238000005507 spraying Methods 0.000 abstract description 6
- 239000013589 supplement Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 70
- 230000033001 locomotion Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
- F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with damping of valve lift
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention provides a fuel injector based on a two-position three-way principle, which comprises a needle valve, wherein the upper part of the needle valve is matched with a needle valve sleeve to form a coupling part; a lower oil inlet throttling hole and an upper oil inlet throttling hole which are communicated with the inner cavity are respectively arranged in the lateral direction of the needle valve sleeve; an oil return valve plate is arranged at the upper part of the needle valve sleeve, an oil return orifice and a control valve are arranged at the upper part of the oil return valve plate, and a cavity defined by the needle valve, the needle valve sleeve and the oil return valve plate is a control cavity; a two-position three-way valve is arranged in the control cavity, and a reset spring is arranged on the step surface of the two-position three-way valve; and the central hole at the center of the two-position three-way valve is communicated with the lateral annular groove through a transverse hole. The oil sprayer based on the two-position three-way principle can accelerate the pressure release and supplement speed of the control cavity, shorten the two-time spraying interval of the oil sprayer, improve the response speed of the oil sprayer, realize more spraying times in a working cycle, realize a boot-shaped oil spraying rule and improve the performance and emission of an engine.
Description
Technical Field
The invention relates to an oil sprayer, in particular to an oil sprayer based on a two-position three-way principle.
Background
As engine emissions regulations escalate, higher performance requirements are placed on fuel injector components in existing fuel injection systems. At present, the electronic control oil injectors on the market mostly adopt an electromagnetic valve to drive a control valve, and a hydraulic servo structure is used for indirectly driving a needle valve to open and close. Due to the characteristics of the structure, unequal delay time of 0.4-0.6 ms exists between the receiving of an electric signal by the electromagnetic valve of the oil sprayer and the opening and closing action of the needle valve, so that the problem that the oil sprayer cannot realize more injection times in one working cycle is limited; meanwhile, in the prior art, in order to improve the response speed of the oil injector, a method for adjusting the ratio of an oil inlet throttling hole to an oil return throttling hole in a servo mechanism is often adopted, but the problem that the opening movement speed of a needle valve is too high is often caused, and an ideal boot-shaped single oil injection rule cannot be obtained.
The patent with the patent number of CN111622877A discloses a novel two-position three-way valve, and the patent provides a novel two-position three-way valve structure, the problem of low response speed of an oil sprayer can be solved by controlling the opening and closing of an oil inlet throttling hole through a three-way valve, but the scheme only can meet the arrangement mode of the overhead oil inlet throttling hole, is not suitable for upgrading and transforming a horizontal oil inlet throttling hole oil sprayer on the market at present, and is not beneficial to the control of the consistency of the oil sprayer because the opening and closing movement of a two-position three-way valve body is easily influenced by the pressure of a control cavity.
A common rail injector with a quick opening and closing function is disclosed in patent No. CN212318195U, which relates to a two-position three-way control valve structure, and the purpose of quick response of the injector is achieved by controlling the opening and closing of one of the lateral oil inlet orifices through the axial movement of a needle valve. However, the structure can only accelerate the speed of the needle valve in the rising and falling periods, can not reduce the delay time problem of electric signals and mechanical movement in the hydraulic servo mechanism, and has limited effect on improving the oil injection response speed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the oil sprayer based on the two-position three-way principle, so that the better combustion characteristic of the oil sprayer is realized, and the higher emission regulation requirements are met. The technical scheme adopted by the invention is as follows:
a fuel injector based on a two-position three-way principle comprises a needle valve, wherein the upper part of the needle valve is matched with a needle valve sleeve to form a matching part;
a lower oil inlet throttling hole and an upper oil inlet throttling hole which are communicated with the inner cavity are respectively arranged in the lateral direction of the needle valve sleeve;
an oil return valve plate is arranged at the upper part of the needle valve sleeve, an oil return orifice and a control valve are arranged at the upper part of the oil return valve plate, and a cavity defined by the needle valve, the needle valve sleeve and the oil return valve plate is a control cavity;
a two-position three-way valve is arranged in the control cavity, a reset spring is arranged on the step surface of the two-position three-way valve, and the other end of the reset spring is supported on the lower end surface of the oil return valve plate;
the center of the two-position three-way valve is provided with a center hole in a penetrating way, the side wall of the two-position three-way valve is provided with a lateral annular groove, and the center hole is communicated with the lateral annular groove through a transverse hole.
Furthermore, the cross holes are provided with a plurality of cross holes and are uniformly distributed along the circumference of the two-position three-way valve.
Furthermore, a plurality of upper pressure balance grooves are formed in the upper end face of the two-position three-way valve and are evenly distributed along the circumference of the two-position three-way valve.
Furthermore, the lower end face of the two three-way valve is provided with a plurality of lower pressure balance grooves which are uniformly distributed along the circumference of the two three-way valve.
Further, go up the oil inlet orifice with the control chamber keeps the intercommunication all the time, the switching of lower oil inlet orifice is by the position decision of two three-way valves.
Furthermore, the distance between the upper edge of the lower oil inlet throttling hole and the upper edge of the lateral annular groove is S, the distance between the upper end face of the two-position three-way valve and the lower end face of the oil return valve plate is L, and the L value is the lift range of the needle valve.
Furthermore, L > S to when guaranteeing the needle valve is to top dead center, lower oil feed orifice with the control chamber is complete to be communicated.
Further, the diameter of the lower oil inlet throttling hole is larger than that of the upper oil inlet throttling hole.
The invention has the advantages that:
1) the oil sprayer can accelerate the pressure release and supplement speed of the control cavity, shorten the two-time spraying interval of the oil sprayer, improve the response speed of the oil sprayer and realize more spraying times in a working cycle.
2) The two-position three-way valve of the oil sprayer can slow down the movement speed of the ascending section of the needle valve, realize the boot-shaped oil spraying rule and improve the performance and the emission of an engine.
3) The motion of the two-position three-way valve of the oil sprayer is directly driven by the needle valve, all cavities in the control cavity are communicated with each other, and the pressure of the control cavity cannot be interfered by the motion of the two-position three-way valve, so that the response consistency of the oil sprayer is ensured, and the ex-factory qualification rate of the oil sprayer is improved.
4) The oil sprayer is simple in structure, is suitable for a control valve structure with transverse oil inlet and top oil outlet, and can be widely applied to the transformation and upgrading of the existing various oil sprayer structures.
Drawings
Fig. 1 is a diagram illustrating an operation state in which a needle valve is in a bottom dead center position while a control valve is closed according to an embodiment of the present invention.
Fig. 2 is a diagram illustrating an operation state in which the control valve is opened while the needle valve is at the bottom dead center position according to the embodiment of the present invention.
Fig. 3 is a diagram showing an operating state in which the control valve is opened while the needle valve is raised to the top dead center position in the embodiment of the present invention.
Fig. 4 is a diagram showing an operating state in which the needle valve is at the top dead center position while the control valve is closed according to the embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a two-position three-way valve according to an embodiment of the present invention.
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 invention and are not intended to limit the invention.
As shown in fig. 1 and 5, the fuel injector according to the two-position three-way principle provided by the embodiment of the invention comprises a needle valve 1, wherein the upper part of the needle valve 1 forms a coupling part fit with a needle valve sleeve 5; a lower oil inlet throttling hole 501 and an upper oil inlet throttling hole 502 which are communicated with the inner cavity are respectively arranged in the lateral direction of the needle valve sleeve 5, and the aperture of the lower oil inlet throttling hole 501 is larger than that of the upper oil inlet throttling hole 502; the upper part of the needle valve sleeve 5 is provided with an oil return valve plate 8, the upper part of the oil return valve plate 8 is provided with an oil return orifice 9 and a control valve 10, and a cavity surrounded by the needle valve 1, the needle valve sleeve 5 and the oil return valve plate 8 is a control cavity 14; a two-position three-way valve 6 is arranged in the control cavity 14, a reset spring 7 is arranged on a step surface 601 of the two-position three-way valve 6, and the other end of the reset spring 7 is supported on the lower end surface of the oil return valve plate 8; the center of the two-position three-way valve 6 is provided with a central hole 602 in a penetrating manner, the side wall of the two-position three-way valve is provided with a lateral annular groove 603, and the central hole 602 is communicated with the lateral annular groove 603 through a transverse hole 604; the plurality of cross holes 604 are uniformly distributed along the circumference of the two-position three-way valve 6; the upper end surface of the two-position three-way valve 6 is provided with a plurality of upper pressure balance grooves 605, and the plurality of upper pressure balance grooves 605 are uniformly distributed along the circumference of the two-position three-way valve 6; a plurality of lower pressure balance grooves 606 are formed in the lower end face of the two-position three-way valve 6, and the plurality of lower pressure balance grooves 606 are uniformly distributed along the circumference of the two-position three-way valve 6; the upper pressure balance groove 605 and the lower pressure balance groove 606 ensure that the fuel pressure of the two-position tee 6 under any working condition is balanced.
Specifically, the upper oil inlet throttling hole 502 is always communicated with the control chamber 14, and the opening and closing of the lower oil inlet throttling hole 501 are determined by the position of the two-position three-way valve 6; the distance of following on lower oil feed orifice 501 with side direction ring channel 603 is established to S, two three-way valve 6 up end with the terminal surface distance is established to L under the oil return valve plate 8, the L value is promptly the lift of needle valve 1, L > S, in order to guarantee when needle valve 1 reaches the top dead center, lower oil feed orifice 501 with control chamber 14 communicates completely.
Specifically, as shown in fig. 1-4, when the electromagnet 12 is not energized, the control valve 10 is in a closed state under the pressing force of the electromagnet spring 13, at this time, the two-position three-way valve 6 is tightly attached to the upper end face of the needle valve 1 under the action of the return spring 7, at this time, the upper oil inlet throttling hole 502 is communicated with the control chamber 14, and the lower oil inlet throttling hole 501 is isolated from the control chamber 14; when the electromagnet 12 is electrified, the electromagnet 12 adsorbs and lifts the armature 11, the control valve 10 is opened, the fuel in the control cavity 14 flows out through the return throttle hole 9, meanwhile, the high-pressure fuel enters the inner cavity of the injector body 4 through the high-pressure fuel inlet hole and is supplemented into the control cavity 14 through the upper fuel inlet throttle hole 502, and because the aperture of the return throttle hole 9 is far larger than that of the upper fuel inlet throttle hole 502, the fuel pressure in the control cavity 14 is rapidly reduced, so that the fuel pressure in the control cavity 14 can be rapidly reduced to the needle valve opening critical value, and the response delay time before the needle valve is opened is reduced; when the pressure in the control cavity 14 is lower than the needle valve opening critical value, the hydraulic pressure acting on the needle valve 1 is larger than the spring pressing force of a needle valve spring 3 acting on the needle valve 1, at the moment, the needle valve 1 starts to move upwards along the needle valve body 2, an oil injector starts to inject oil, meanwhile, the two-position three-way valve 6 is pushed by the needle valve 1 to synchronously rise until the needle valve 1 moves to the lower end face of an oil return valve plate 8, in the process, a lower oil inlet throttling hole 501 is opened step by step, and the fuel oil in the oil injector body 4 enters the control cavity 14 through the lower oil inlet throttling hole 501, so that the pressure reduction speed in the control cavity 14 is reduced, further the resultant force acting on the needle valve 1 is reduced, the opening movement speed of; when the electromagnet 12 is powered off, the armature 11 falls under the action of the electromagnet spring 13, the control valve 10 is closed, at the moment, fuel in the fuel injector body 4 is supplemented into the control cavity 14 through the lower fuel inlet throttling hole 501 and the upper fuel inlet throttling hole 502 respectively, at the moment, the fuel pressure in the control cavity 14 rapidly rises, the needle valve 1 is rapidly closed to reach a critical value, and the response delay time before the needle valve is closed is reduced; when the pressure in the control valve 14 is higher than the needle valve closing critical value, the needle valve 1 starts to move downwards along the needle valve body 2 under the action of the needle valve spring 3, the two-position three-way valve 6 synchronously moves downwards along with the needle valve 1 under the action of the return spring 7 until the initial state is recovered, and the oil injector stops injecting oil.
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 (8)
1. The oil sprayer based on the two-position three-way principle is characterized by comprising a needle valve (1), wherein the upper part of the needle valve (1) is matched with a needle valve sleeve (5) to form a coupling part;
a lower oil inlet throttling hole (501) and an upper oil inlet throttling hole (502) which are communicated with the inner cavity are respectively arranged in the lateral direction of the needle valve sleeve (5);
an oil return valve plate (8) is arranged at the upper part of the needle valve sleeve (5), an oil return throttling hole (9) and a control valve (10) are arranged at the upper part of the oil return valve plate (8), and a cavity surrounded by the needle valve (1), the needle valve sleeve (5) and the oil return valve plate (8) is a control cavity (14);
a two-position three-way valve (6) is arranged in the control cavity (14), a reset spring (7) is arranged on a step surface (601) of the two-position three-way valve (6), and the other end of the reset spring (7) is supported on the lower end surface of the oil return valve plate (8);
two three-way valve (6) center run through to be opened there is centre bore (602), and the lateral wall is opened has side direction ring channel (603), centre bore (602) with communicate through cross bore (604) between side direction ring channel (603).
2. A fuel injector according to the two-position three-way principle as claimed in claim 1,
the cross holes (604) are provided with a plurality of cross holes and are uniformly distributed along the circumference of the two-position three-way valve (6).
3. A fuel injector according to the two-position three-way principle as claimed in claim 1,
the upper end face of the two-position three-way valve (6) is provided with a plurality of upper pressure balance grooves (605), and the plurality of upper pressure balance grooves (605) are uniformly distributed along the circumference of the two-position three-way valve (6).
4. A fuel injector according to the two-position three-way principle as claimed in claim 1,
the lower end face of the two three-way valves (6) is provided with a plurality of downward pressure balance grooves (606) and a plurality of downward pressure balance grooves (606) are evenly distributed on the circumference of the two three-way valves (6).
5. A fuel injector according to the two-position three-way principle as claimed in claim 1,
the upper oil inlet throttling hole (502) is communicated with the control cavity (14) all the time, and the opening and closing of the lower oil inlet throttling hole (501) are determined by the position of the two-position three-way valve (6).
6. A fuel injector according to the two-position three-way principle as claimed in claim 1,
the distance between the upper edge of the lower oil inlet throttling hole (501) and the upper edge of the lateral annular groove (603) is set as S, the distance between the upper end face of the two-position three-way valve (6) and the lower end face of the oil return valve plate (8) is set as L, and the L value is the lift range of the needle valve (1).
7. A fuel injector according to the two-position three-way principle as claimed in claim 6,
l > S to guarantee when needle valve (1) to top dead center, lower oil feed orifice (501) with control chamber (14) communicate completely.
8. A fuel injector according to the two-position three-way principle as claimed in claim 1,
the diameter of the lower oil inlet throttling hole (501) is larger than that of the upper oil inlet throttling hole (502).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110526189.8A CN113074069B (en) | 2021-05-14 | 2021-05-14 | Two-position three-way principle fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110526189.8A CN113074069B (en) | 2021-05-14 | 2021-05-14 | Two-position three-way principle fuel injector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113074069A true CN113074069A (en) | 2021-07-06 |
| CN113074069B CN113074069B (en) | 2024-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110526189.8A Active CN113074069B (en) | 2021-05-14 | 2021-05-14 | Two-position three-way principle fuel injector |
Country Status (1)
| Country | Link |
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| CN (1) | CN113074069B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944580A (en) * | 2021-11-10 | 2022-01-18 | 一汽解放汽车有限公司 | Ejector and engine |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030155437A1 (en) * | 2002-02-05 | 2003-08-21 | Ning Lei | Fuel injector with dual control valve |
| JP2006161568A (en) * | 2004-12-02 | 2006-06-22 | Nippon Soken Inc | Control valve and fuel injection valve having the same |
| CN106545444A (en) * | 2017-01-18 | 2017-03-29 | 哈尔滨工程大学 | A kind of two-way oil-feed bypass type electric-controlled fuel injector with ditch |
| CN106593723A (en) * | 2017-01-18 | 2017-04-26 | 哈尔滨工程大学 | Double-path oil inlet bypass type electric control oil sprayer |
| CN106640453A (en) * | 2017-01-18 | 2017-05-10 | 哈尔滨工程大学 | Micro-dynamic oil-returning electric control oil sprayer with hydraulic feedback |
| CN107035586A (en) * | 2017-01-18 | 2017-08-11 | 哈尔滨工程大学 | A kind of On Fluctuations oil return resonant mode electric-controlled fuel injector with hydraulic feedback |
| CN111577498A (en) * | 2020-05-18 | 2020-08-25 | 上海工程技术大学 | Common rail oil injector based on two-position three-way principle |
| CN214836816U (en) * | 2021-05-14 | 2021-11-23 | 无锡威孚高科技集团股份有限公司 | Oil sprayer based on two-position three-way principle |
-
2021
- 2021-05-14 CN CN202110526189.8A patent/CN113074069B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030155437A1 (en) * | 2002-02-05 | 2003-08-21 | Ning Lei | Fuel injector with dual control valve |
| JP2006161568A (en) * | 2004-12-02 | 2006-06-22 | Nippon Soken Inc | Control valve and fuel injection valve having the same |
| CN106545444A (en) * | 2017-01-18 | 2017-03-29 | 哈尔滨工程大学 | A kind of two-way oil-feed bypass type electric-controlled fuel injector with ditch |
| CN106593723A (en) * | 2017-01-18 | 2017-04-26 | 哈尔滨工程大学 | Double-path oil inlet bypass type electric control oil sprayer |
| CN106640453A (en) * | 2017-01-18 | 2017-05-10 | 哈尔滨工程大学 | Micro-dynamic oil-returning electric control oil sprayer with hydraulic feedback |
| CN107035586A (en) * | 2017-01-18 | 2017-08-11 | 哈尔滨工程大学 | A kind of On Fluctuations oil return resonant mode electric-controlled fuel injector with hydraulic feedback |
| CN111577498A (en) * | 2020-05-18 | 2020-08-25 | 上海工程技术大学 | Common rail oil injector based on two-position three-way principle |
| CN214836816U (en) * | 2021-05-14 | 2021-11-23 | 无锡威孚高科技集团股份有限公司 | Oil sprayer based on two-position three-way principle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944580A (en) * | 2021-11-10 | 2022-01-18 | 一汽解放汽车有限公司 | Ejector and engine |
| CN113944580B (en) * | 2021-11-10 | 2022-07-19 | 一汽解放汽车有限公司 | Ejector and engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113074069B (en) | 2024-05-17 |
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