CN111749816A - Direct injection type hydraulic control gas fuel injector - Google Patents
Direct injection type hydraulic control gas fuel injector Download PDFInfo
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- CN111749816A CN111749816A CN202010593906.4A CN202010593906A CN111749816A CN 111749816 A CN111749816 A CN 111749816A CN 202010593906 A CN202010593906 A CN 202010593906A CN 111749816 A CN111749816 A CN 111749816A
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- Prior art keywords
- injector
- needle valve
- hydraulic
- cavity
- direct injection
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
- F02M21/026—Lift valves, i.e. stem operated valves
- F02M21/0263—Inwardly opening single or multi nozzle valves, e.g. needle valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0251—Details of actuators therefor
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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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0275—Injectors for in-cylinder direct injection, e.g. injector combined with spark plug
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Analytical Chemistry (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a direct injection type hydraulic control gas fuel injector, which comprises an injector connected with a gas supply system, wherein the injector comprises an injector upper body and an injector lower body, one side of the injector upper body is in threaded connection with the injector lower body, the other side of the injector upper body is provided with a gas pipeline interface and a hydraulic oil way interface, a hydraulic cavity is arranged in the injector lower body, and a needle valve body which is abutted against the hydraulic cavity and penetrates through the end part of the injector lower body, a gas channel which penetrates through the injector upper body, the hydraulic cavity and the needle valve body and is communicated to a needle valve hole in the needle valve body is arranged on the injector upper body through the gas pipeline interface, and a hydraulic oil channel which is communicated with the injector upper body and the hydraulic cavity and is. The invention aims to provide a hydraulic control gas fuel injector which is convenient to process and high in applicability and is used for a direct injection engine in a gas fuel cylinder.
Description
Technical Field
The invention relates to the technical field of injection systems of internal combustion engines, in particular to a direct injection type hydraulic control gas fuel injector.
Background
Because petroleum is a non-renewable resource with limited reserves, the petroleum resource in China seriously depends on import, and great potential energy safety hazards exist. In addition, social problems such as global warming and environmental pollution are also becoming more prominent. In the face of the double challenges of carbon dioxide emission and energy safety, the selection of a low-carbon renewable fuel is very important. Hydrogen energy is an ideal renewable energy source, and can be obtained by directly decomposing water by using disposable energy sources such as nuclear energy or solar energy. The hydrogen fueled engine is theoretically free of CO2, HC, and CO emissions, and the combustion products are clean. The heat value of the hydrogen is 141.6MJ/kg, the heat value of the gasoline is 47.3MJ/kg, compared with other internal combustion engine fuels, the hydrogen has good heat and mass transfer characteristics, the flame propagation speed is high during combustion, the required ignition energy is low, and the ignition energy is about 1/10 of gasoline-air mixed gas. The hydrogen has a wide combustible mixture concentration range, can be combusted under the lean condition with the volume fraction of 4 percent, and has the advantage of lean combustion. Therefore, many countries in the world are increasingly researching and developing hydrogen as a very potential alternative fuel for internal combustion engines.
Hydrogen internal combustion engines mainly include two types, i.e., an out-cylinder injection type and an in-cylinder direct injection type, depending on the fuel injection position. The cylinder outside injection type internal combustion engine has a simple structure, is similar to the structure of the traditional gas fuel internal combustion engine, and most of the hydrogen fuel internal combustion engines internationally introduced at present belong to the form. However, due to the low density of hydrogen, the out-of-cylinder injected hydrogen inevitably occupies a large cylinder volume, which in the theoretical mixture ratio is about 1/3. This results in an out-of-cylinder injection hydrogen internal combustion engine that is about 15% less powerful than gasoline engines.
The direct injection type hydrogen internal combustion engine in the cylinder has the advantages that the volume of the cylinder occupied by hydrogen is reduced, concentration stratification in the cylinder can be realized through multiple fuel injections, combustion is optimized, and accordingly high heat efficiency and power of the engine are guaranteed. The power of the internal-injection hydrogen internal-combustion engine under the same displacement can be increased by more than 20 percent compared with the external-injection type. Therefore, direct injection in cylinder is an efficient hydrogen supply method, and has the advantages of high thermal efficiency, high power per liter, and low possibility of backfire. However, the technology of the injector for directly injecting hydrogen becomes a bottleneck problem of engineering application of the in-cylinder direct injection hydrogen engine, and at present, the in-cylinder direct injection injector for hydrogen is still in a research stage, and a mature product is not available. Similar to direct in-cylinder injection of hydrogen, direct in-cylinder injection of other gaseous fuels, such as natural gas, petroleum gas, etc., also faces the same bottleneck problem.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a hydraulic control gas fuel injector which is convenient to process and high in applicability and is used for a gas fuel direct injection engine.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a direct injection type hydraulic control gas fuel injector comprises an injector connected with a gas supply system, wherein the injector comprises an injector upper body and an injector lower body, one side of the injector upper body is in threaded connection with the injector lower body, the other side of the injector upper body is provided with a gas pipeline interface and a hydraulic oil way interface, a hydraulic cavity is arranged in the injector lower body, and a needle valve body is abutted against the hydraulic cavity and penetrates out of the end part of the injector lower body;
a compression cavity communicated with the hydraulic cavity is formed in the ejector upper body, a limiting block with a through hole is clamped between the compression cavity and the hydraulic cavity, a spring seat abutting against the limiting block is arranged in the compression cavity, and a return spring is arranged between the spring seat and the inner wall of the compression cavity; a valve needle which penetrates through the hydraulic cavity and is propped against the spring seat is arranged in a needle valve hole of the needle valve body; the needle valve rod part of the valve needle in the hydraulic cavity is provided with a needle valve piston which is positioned between the hydraulic oil duct and the hydraulic cavity communicating part and the limiting block and is in sliding fit with the inner wall of the hydraulic cavity, an annular oil passing gap is formed between the needle valve rod part and the needle valve hole, and the top end of the valve needle is provided with a sealing conical surface for plugging a spray hole at the end part of the needle valve body.
Furthermore, an oil return channel communicated with the compression cavity is arranged on the upper body of the ejector.
Furthermore, a boss which is protruded from one side of the communication position of the hydraulic oil duct and the hydraulic cavity and props against the needle valve piston is arranged in the hydraulic cavity.
Further, the spring seat is provided with a jack which is inserted into the end of the valve needle.
Furthermore, a gasket is arranged at one end of the compression cavity, which is abutted against the return spring.
Furthermore, the end of the injector lower body is fixedly provided with a copper gasket which is sleeved outside the needle valve body.
Further, a sealing ring which is connected with the internal combustion engine in a sealing mode is arranged outside the upper portion of the ejector.
Compared with the prior art, the invention has the following beneficial effects:
the invention can be applied to the in-cylinder direct injection technology of all gas fuels, has high response speed, can accurately control the injection time and the injection duration time through the hydraulic control technology, and lubricates the part of the needle valve which needs long-term sliding friction by using hydraulic oil, thereby having good lubrication effect and long service life.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a needle valve according to the present invention;
FIG. 3 is an enlarged view of the needle valve body and the injector lower body according to the present invention;
fig. 4 is a schematic diagram of a hydraulic control method according to an embodiment of the present invention.
Description of reference numerals:
1-gas pipeline interface, 2-gas channel, 3-injector upper body, 4-oil return channel, 5-sealing ring, 6-gasket, 7-reset spring, 8-spring seat, 9-limiting block, 10-needle valve, 11-hydraulic cavity, 12-injector lower body, 13-copper gasket, 14-needle valve body, 15-hydraulic cavity, 16-spray hole, 17-hydraulic oil channel, 18-hydraulic oil channel interface, 19-needle valve hole, 20-compression cavity, 21-hydraulic oil pump, 22-pressure limiting valve, 23-electromagnetic valve, 24-gas supply system, 25-pressure stabilizing cavity, 26-oil pipeline, 27-gas pipeline, 101-needle valve piston, 102-needle valve rod part, 103-sealing conical surface, 151-boss.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 3, a direct injection type hydraulic control gas fuel injector comprises an injector connected with a gas supply system, wherein the injector comprises an injector upper body 3 and an injector lower body 12, one side of the injector upper body 3 is in threaded connection with the injector lower body 12, the other side of the injector upper body is provided with a gas pipeline interface 1 and a hydraulic oil way interface 18, the injector lower body 12 is internally provided with a hydraulic cavity 11 and a needle valve body 14 which is abutted against the hydraulic cavity 11 and penetrates through the end part of the injector lower body 12, the injector upper body 3 is provided with a gas channel 2 which penetrates through the injector upper body 3, the hydraulic cavity 11 and the needle valve body 14 and is communicated with a needle valve hole 19 in the needle valve body 14 through the gas pipeline interface 1, and the injector upper body 3 is provided with a hydraulic oil way 17 which is communicated with the injector upper body 3 and the;
a compression cavity 20 communicated with the hydraulic cavity 15 is formed in the ejector upper body 3, a limiting block 9 with a through hole is clamped between the compression cavity 20 and the hydraulic cavity 15, a spring seat 8 abutting against the limiting block 9 is arranged in the compression cavity 20, and a return spring 7 is arranged between the spring seat 8 and the inner wall of the compression cavity 20; a valve needle 10 which penetrates through the hydraulic cavity 15 and is abutted against the spring seat 8 is arranged in a needle valve hole 19 of the needle valve body 14; a needle valve piston 101 which is positioned between the communication part of the hydraulic oil duct 17 and the hydraulic cavity 15 and the limiting block 9 and is in sliding fit with the inner wall of the hydraulic cavity 15 is arranged on a needle valve rod part 102 of the needle valve 10 in the hydraulic cavity 15, an annular oil passing gap is formed between the needle valve rod part 102 and the needle valve hole 19, and the top end of the needle valve 10 is provided with a sealing conical surface 103 for blocking a spray hole 16 at the end part of the needle valve body 14; a gasket 6 for preventing the compression cavity 20 from being worn is arranged at one end of the compression cavity 20, which is abutted against the return spring 7; a copper gasket 13 sleeved outside the needle valve body 14 is fixedly arranged at the end part of the injector lower body 12; and a sealing ring 5 which is connected with the internal combustion engine in a sealing way is arranged outside the injector upper body 3.
As shown in fig. 4, the present invention controls the injectors by a hydraulic control system. When the ejector works, the hydraulic oil pump 21 pumps hydraulic oil into the pressure stabilizing cavity 25, the pressure limiting valve 22 is opened after the oil pressure in the pressure stabilizing cavity 25 reaches a set pressure, and the oil in the pressure stabilizing cavity 25 flows into the oil tank to keep the constant set pressure in the pressure stabilizing cavity 25. When the injection is started, the ECU sends out a control signal, the electromagnetic valve 23 is closed, high-pressure oil in the pressure stabilizing cavity 25 enters the hydraulic oil duct 17 of the injector upper body 3 through the oil conveying pipeline 26 and then is injected into the hydraulic cavity 15 of the injector lower body 12, hydraulic oil enters the hydraulic cavity 15 from the communication part of the hydraulic oil duct 17 and the hydraulic cavity 15, the needle valve piston 101 is extruded by oil pressure, the bottom of the needle valve 10 pushes the spring seat 8 to jack the needle valve 10 against the elastic force of the return spring 7, the gas channel 2 is communicated with the spray hole 16, and gas fuel is sprayed into a combustion chamber of the engine from the gas supply system 24. When the injection is finished, the ECU controls to open the electromagnetic valve 23, so that the other oil pipeline 26 is communicated with a hydraulic oil tank, the hydraulic oil pressure in the hydraulic cavity 15 is rapidly reduced, the needle valve 10 is restored under the action of the return spring 7, the spring seat 8 moves towards the limiting block 9 and approaches the limiting block 9, the sealing conical surface 103 at the end part of the needle valve 10 blocks the spray hole 16, and the injection is finished. The present invention may also control injection via other hydraulic control systems known in the art.
The injector upper body 3 is provided with an oil return channel 4 communicated with the compression cavity 20, the oil return channel 4 can be used for leaking out a gap between the needle valve piston 101 and the inner wall of the hydraulic cavity 15 in the hydraulic cavity 15, and hydraulic oil flowing into the compression cavity 20 through the through hole of the limiting block 9 is further discharged into the oil return channel 4, so that the expansion and contraction of the return spring 7 are prevented from being influenced after the compression cavity 20 is filled with the hydraulic oil.
Wherein, be provided with in the hydraulic pressure chamber 15 and prop needle valve piston 101's boss 151 by hydraulic pressure oil duct 17 and hydraulic pressure chamber intercommunication department one side protrusion, boss 151 can play the effect of propping needle valve piston 101 in advance, makes to have the space of being convenient for let hydraulic oil inflow between needle valve piston 101 and the hydraulic pressure chamber 15 inner wall, improves needle valve piston 101's sensitivity, is convenient for accurate control injection moment and injection duration.
The spring seat 8 is provided with a jack inserted into the end of the valve needle 10, so that the spring seat 8 and the valve needle 10 are more firmly supported.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A direct injection hydraulically controlled gaseous fuel injector comprising an injector connected to a gas supply system, characterized by: the ejector comprises an ejector upper body and an ejector lower body, one side of the ejector upper body is in threaded connection with the ejector lower body, the other side of the ejector upper body is provided with a gas pipeline interface and a hydraulic oil path interface, a hydraulic cavity is arranged in the ejector lower body, and a needle valve body is abutted against the hydraulic cavity and penetrates out of the end part of the ejector lower body;
a compression cavity communicated with the hydraulic cavity is formed in the ejector upper body, a limiting block with a through hole is clamped between the compression cavity and the hydraulic cavity, a spring seat abutting against the limiting block is arranged in the compression cavity, and a return spring is arranged between the spring seat and the inner wall of the compression cavity; a valve needle which penetrates through the hydraulic cavity and is propped against the spring seat is arranged in a needle valve hole of the needle valve body; the needle valve rod part of the valve needle in the hydraulic cavity is provided with a needle valve piston which is positioned between the hydraulic oil duct and the hydraulic cavity communicating part and the limiting block and is in sliding fit with the inner wall of the hydraulic cavity, an annular oil passing gap is formed between the needle valve rod part and the needle valve hole, and the top end of the valve needle is provided with a sealing conical surface for plugging a spray hole at the end part of the needle valve body.
2. A direct injection hydraulically controlled gaseous fuel injector as claimed in claim 1, characterized in that: and the upper injector body is provided with an oil return channel communicated with the compression cavity.
3. A direct injection hydraulically controlled gaseous fuel injector as claimed in claim 1, characterized in that: and a boss which is protruded from one side of the communication part of the hydraulic oil duct and the hydraulic cavity and props against the needle valve piston is arranged in the hydraulic cavity.
4. A direct injection hydraulically controlled gaseous fuel injector as claimed in claim 1, characterized in that: the spring seat is provided with a jack which is inserted and combined with the end part of the valve needle.
5. A direct injection hydraulically controlled gaseous fuel injector as claimed in claim 1, characterized in that: and a gasket is arranged at one end of the compression cavity, which is abutted against the return spring.
6. A direct injection hydraulically controlled gaseous fuel injector as claimed in claim 1, characterized in that: the end of the ejector lower body is fixedly provided with a copper gasket sleeved outside the needle valve body.
7. A direct injection hydraulically controlled gaseous fuel injector as claimed in claim 1, characterized in that: and a sealing ring which is in sealing connection with the internal combustion engine is arranged outside the upper body of the ejector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010593906.4A CN111749816A (en) | 2020-06-24 | 2020-06-24 | Direct injection type hydraulic control gas fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010593906.4A CN111749816A (en) | 2020-06-24 | 2020-06-24 | Direct injection type hydraulic control gas fuel injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111749816A true CN111749816A (en) | 2020-10-09 |
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ID=72677380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010593906.4A Pending CN111749816A (en) | 2020-06-24 | 2020-06-24 | Direct injection type hydraulic control gas fuel injector |
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| CN (1) | CN111749816A (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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10220303A (en) * | 1997-02-04 | 1998-08-18 | Kubota Corp | Fuel gas injector for spark ignition type gas engine |
| CN103109068A (en) * | 2010-09-28 | 2013-05-15 | 株式会社Ihi | Gas injection valve |
| CN109555620A (en) * | 2018-10-22 | 2019-04-02 | 中船动力研究院有限公司 | Fuel gas injection valve and its working method with automatic safety device |
| CN110036194A (en) * | 2016-12-16 | 2019-07-19 | 莱奥林奇有限责任公司 | Fuel injector assembly |
| CN110118137A (en) * | 2019-04-24 | 2019-08-13 | 英嘉动力科技无锡有限公司 | A kind of gaseous fuel injection system |
-
2020
- 2020-06-24 CN CN202010593906.4A patent/CN111749816A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10220303A (en) * | 1997-02-04 | 1998-08-18 | Kubota Corp | Fuel gas injector for spark ignition type gas engine |
| CN103109068A (en) * | 2010-09-28 | 2013-05-15 | 株式会社Ihi | Gas injection valve |
| CN110036194A (en) * | 2016-12-16 | 2019-07-19 | 莱奥林奇有限责任公司 | Fuel injector assembly |
| CN109555620A (en) * | 2018-10-22 | 2019-04-02 | 中船动力研究院有限公司 | Fuel gas injection valve and its working method with automatic safety device |
| CN110118137A (en) * | 2019-04-24 | 2019-08-13 | 英嘉动力科技无锡有限公司 | A kind of gaseous fuel injection system |
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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Application publication date: 20201009 |