CN115234395A - Cylinder cover of active pre-combustion direct-injection structure gas engine - Google Patents

Cylinder cover of active pre-combustion direct-injection structure gas engine Download PDF

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Publication number
CN115234395A
CN115234395A CN202210794988.8A CN202210794988A CN115234395A CN 115234395 A CN115234395 A CN 115234395A CN 202210794988 A CN202210794988 A CN 202210794988A CN 115234395 A CN115234395 A CN 115234395A
Authority
CN
China
Prior art keywords
cylinder head
gas
gas fuel
combustion
fuel nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210794988.8A
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Chinese (zh)
Inventor
卢一乐
沈捷
覃壮革
廖升友
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangxi Yuchai Machinery Co Ltd
Original Assignee
Guangxi Yuchai Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangxi Yuchai Machinery Co Ltd filed Critical Guangxi Yuchai Machinery Co Ltd
Priority to CN202210794988.8A priority Critical patent/CN115234395A/en
Publication of CN115234395A publication Critical patent/CN115234395A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
    • F02B19/1004—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder details of combustion chamber, e.g. mounting arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/10—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder
    • F02B19/1019—Engines characterised by precombustion chambers with fuel introduced partly into pre-combustion chamber, and partly into cylinder with only one pre-combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/12—Engines characterised by precombustion chambers with positive ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/242—Arrangement of spark plugs or injectors
    • 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)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

The invention discloses a cylinder cover of an active pre-combustion direct-injection structure gas machine, which comprises a high-pressure connecting pipe, a gas fuel nozzle, a gas fuel conveying pipe, a pre-combustion chamber and a spark plug, wherein the high-pressure connecting pipe is connected with the gas fuel nozzle; the high-pressure connecting pipe is inserted into the cylinder cover from the side wall of one side of the cylinder cover and extends to the inner center of the cylinder cover; the gas fuel nozzle is inserted into the cylinder head from one side wall of the cylinder head, and a nozzle tip of the gas fuel nozzle is exposed from a bottom surface of the cylinder head; the gas fuel delivery pipe is respectively communicated with the high-pressure connecting pipe and the gas fuel nozzle; the axial lead of the precombustion chamber is arranged at the lower part of the center of the cylinder cover in a way of being vertical to the bottom surface of the cylinder cover; the spark plug is arranged at the upper part of the precombustion chamber, and the ignition part of the spark plug is exposed in the precombustion chamber. The cylinder cover of the active pre-combustion direct-injection structure gas engine can adopt the structure of a diesel engine except that an oil inlet structure is replaced by a gas inlet structure.

Description

Cylinder cover of active pre-combustion direct-injection structure gas engine
Technical Field
The invention relates to the field of internal combustion engines, in particular to a cylinder cover of an active pre-combustion direct-injection structure gas engine.
Background
The cylinder head is an important part of a combustion chamber which is formed by the cylinder head, a cylinder sleeve and the cylinder block on the engine, and the structure of the cylinder head comprises air required by combustion and a part for discharging exhaust gas after the combustion, namely an air inlet function and an exhaust function, and also comprises a fuel conveying structure and a cooling structure. When the cylinder cover of the existing gas engine does work, mixed gas of natural gas and clean air is input through the air inlet pipe, the mixed gas enters the cylinder cover and then reaches the engine combustion chamber at the end along the air inlet passage, and then the gas is ignited through the ignition coil assembly which penetrates through the inside of the cylinder cover and is positioned in the combustion chamber at the tail end, so that the purpose of burning fuel to do work is achieved.
This kind of structure need install special blender additional at the front end, just can send into the cylinder cap through the intake pipe to air and combustible natural gas carry out the premixing to the intake pipe will bear the gaseous pressure of mist, and is very high to the seal requirement, because in case reveal the back arouse the explosion easily. Under the route, the fuel entering route is long, the combustion period is delayed, the combustion duration is long, when the combustion time exceeds the moment of doing work, the movement direction of a piston is opposite due to the huge impact force of gas combustion, the engine knocks, the power of the engine is weakened, the noise is loud, the vibration is large, and the user experience is seriously influenced. In addition, the ignition of a large amount of gas mixture requires a high ignition energy and a high performance requirement for the ignition coil.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a cylinder cover of an active pre-combustion direct-injection structure gas engine, which only replaces an oil inlet structure with a gas inlet structure and can follow the structure of a diesel engine.
In order to achieve the aim, the invention provides a cylinder cover of an active type pre-combustion direct-injection structure gas engine, which comprises a high-pressure connecting pipe, a gas fuel nozzle, a gas fuel conveying pipe, a pre-combustion chamber and a spark plug, wherein the high-pressure connecting pipe is connected with the gas fuel nozzle; the high-pressure connecting pipe is inserted into the cylinder cover from one side wall of the cylinder cover and extends to the inner center of the cylinder cover; the gas fuel nozzle is inserted into the cylinder head from one side wall of the cylinder head, and a nozzle tip of the gas fuel nozzle is exposed from a bottom surface of the cylinder head; the gas fuel delivery pipe is respectively communicated with the high-pressure connecting pipe and the gas fuel nozzle; the axial lead of the precombustion chamber is arranged at the lower part of the center of the cylinder cover in a way of being vertical to the bottom surface of the cylinder cover; the spark plug is arranged at the upper part of the precombustion chamber, and the ignition part of the spark plug is exposed in the precombustion chamber.
In a preferred embodiment, the cylinder head of the active pre-combustion direct-injection structural gas engine further comprises a flame injector which is arranged at a bottom port of the pre-combustion chamber, and an outlet port of the flame injector is exposed out of the bottom surface of the cylinder head.
In a preferred embodiment, the cylinder head of the active pre-combustion direct-injection structural gas engine further includes an ignition coil assembly disposed at an upper portion of the center of the cylinder head, a top of the ignition coil assembly is exposed outside the top of the cylinder head, and the ignition coil assembly is electrically connected to the spark plug.
In a preferred embodiment, the cylinder head of the active pre-combustion direct-injection structural gas engine further comprises a gas path arranged in the middle of the center of the cylinder head, and the gas path is communicated between the tail end of the high-pressure connecting pipe and the pre-combustion chamber.
In a preferred embodiment, the position where the high-pressure connection pipe is inserted into the cylinder block and the position where the gas fuel nozzle is inserted into the cylinder block are located on the same side wall of the cylinder block, and the insertion position of the high-pressure connection pipe is higher than the insertion position of the gas fuel nozzle.
Compared with the prior art, the cylinder cover of the active pre-combustion direct-injection structure gas machine has the following beneficial effects: this scheme only needs to be changed into the oil feed structure and advances outside the gas structure, other structures that can continue to use the diesel engine, and is many with the general part of diesel engine, and assemblies such as intake pipe assembly, water pump assembly, attemperator all can directly borrow, and it can to do the addition of advancing the gas structure on diesel engine basis in other words. The cylinder cover of the gas engine of the original traditional route is overcome, a large number of special parts need to be designed to adapt to the original diesel engine air inlet channel, mixed gas is improved from air inlet, the part of the whole engine to be transformed is more, special parts need to be designed for a temperature regulator, a mixer, a water pump, a supercharger system and the like, parts of the diesel engine cannot be used generally, and the research and development cost is far higher than that of the precombustion chamber structure route. The gas fuel is directly sprayed into the combustion chamber and is mixed with air in the combustion chamber, the path is short, the stability is strong, the combustion delay period and the combustion duration can be greatly shortened, the detonation boundary is widened, the detonation pressure circulation fluctuation is reduced, and the combustion stability of an engine can be greatly improved.
Drawings
FIG. 1 is a schematic top view of a cylinder head according to an embodiment of the present invention;
FIG. 2 is a schematic, diagrammatic illustration of the structure of a cylinder head according to an embodiment of the present invention;
FIG. 3 is a gas operating diagram of a cylinder head according to an embodiment of the prior art;
fig. 4 is a gas operation diagram of a cylinder head according to an embodiment of the present invention.
Description of the main reference numerals:
1-high pressure connection pipe, 2-gas fuel nozzle, 201-nozzle end, 3-gas fuel delivery pipe, 4-precombustion chamber, 5-spark plug, 6-flame injector, 7-ignition coil assembly, 8-gas path and 9-cylinder cover.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 1 to 2, a cylinder head of an active pre-combustion direct injection structure gas engine according to a preferred embodiment of the present invention mainly includes a high-pressure connecting pipe 1, a gas fuel nozzle 2, a gas fuel delivery pipe 3, a pre-combustion chamber 4, a spark plug 5, and the like. The high-pressure connection pipe 1 is inserted into the cylinder head from a side wall of the cylinder head side and extends toward an inner center of the cylinder head, and the high-pressure connection pipe 1 has a slight downward inclination from the outside to the inside. The gas fuel nozzle 2 is inserted into the cylinder head from the cylinder head-side wall, and a nozzle tip 201 of the gas fuel nozzle 2 is exposed from the bottom surface of the cylinder head. The gas fuel delivery pipe 3 communicates with the high-pressure connection pipe 1 and the gas fuel nozzle 2, respectively, and delivers combustible gas to the high-pressure connection pipe 1 and the gas fuel nozzle 2. The axial lead of the prechamber 4 is arranged substantially perpendicular to the bottom surface of the cylinder head in the lower part of the cylinder head centre, and the bottom opening of the prechamber 4 communicates with the bottom surface of the cylinder head. The ignition plug 5 is provided in an upper portion of the precombustion chamber 4, and an ignition portion of the ignition plug 5 is exposed in the precombustion chamber 4, and the ignition plug 5 is used to ignite the mixture gas in the precombustion chamber 4.
Referring to fig. 2, in some embodiments, the cylinder head of the active pre-combustion direct-injection structure gas engine further includes a flame injector 6 disposed at the bottom of the pre-combustion chamber 4, and the nozzle of the flame injector 6 is exposed outside the bottom of the cylinder head, and the flame injector 6 is used for injecting the flame of the mixed gas ignited in the pre-combustion chamber 4 into the combustion chamber.
Referring to fig. 2, in some embodiments, the cylinder head of the active pre-combustion direct-injection structural gas engine further includes an ignition coil assembly 7 disposed at an upper portion of the center of the cylinder head, a top portion of the ignition coil assembly 7 is exposed outside the top portion of the cylinder head, and the ignition coil assembly 7 is electrically connected to the spark plug 5.
Referring to fig. 2, in some embodiments, the cylinder head of the active pre-combustion direct-injection structural gas engine further includes a gas path 8 disposed at a middle portion of a center of the cylinder head, the gas path 8 communicates between a terminal end of the high-pressure connecting pipe 1 and the pre-combustion chamber 4, and the combustible gas is delivered from the high-pressure connecting pipe 1 into the pre-combustion chamber 4 through the gas path 8.
Referring to fig. 1 and 2, in some embodiments, the position of the high-pressure connection pipe 1 inserted into the cylinder block and the position of the gas fuel nozzle 2 inserted into the cylinder block are located on the same side wall of the cylinder block, and the insertion position of the high-pressure connection pipe 1 is higher than that of the gas fuel nozzle 2 because the position of the nozzle end 201 exposed from the bottom surface of the cylinder head is eccentric from the exposed position of the flame injector 6.
As shown in fig. 3 and 4, in some embodiments, the operation principle of the combustible gas of the cylinder head of the active pre-combustion direct injection structural gas engine of the invention is substantially as follows: the cylinder cover does not need a mixer structure, and through the structures of a gas fuel nozzle 2, a high-pressure connecting pipe 1, a precombustion chamber 4, an ignition coil and the like designed on the cylinder cover, fuel gas (such as but not limited to hydrogen) is directly pumped into the gas fuel nozzle 2 and the high-pressure connecting pipe 1 during work application, and a large amount of fuel gas is directly sprayed into a combustion chamber through an active gas nozzle structure arranged on the cylinder cover; the ignition coil assembly 7 (upper part) and the active precombustion chamber 4 structure (lower part) which run through the combustion chamber are arranged in the middle of the cylinder cover, and the high-pressure connecting pipe 1 structure which is arranged laterally can be communicated to the precombustion chamber 4 at the middle lower part of the cylinder cover; when the hydrogen-gas burner works, a small amount of hydrogen enters the lower part of the precombustion chamber 4 through the high-pressure connecting pipe 1 and the gas path 8, then the spark plug 5 ignites the small amount of hydrogen entering the precombustion chamber to form flame, the burning flame is sprayed out from a nozzle of the flame sprayer 6 at the bottom opening of the precombustion chamber 4, and the flame quickly ignites a large amount of hydrogen fed from a hydrogen nozzle in the combustion chamber and air fed from an air inlet pipe to do work.
In summary, the cylinder head of the active type pre-combustion direct injection structure gas engine of the present invention has the following advantages: this scheme only need with the oil feed structure replace into advance outside the gas structure, other structures that can continue the diesel engine, and is many with the general part of diesel engine, and assemblies such as intake pipe assembly, water pump assembly, thermoregulator all can directly borrow, be equivalent to do the addition of advancing the gas structure on the diesel engine basis can, this scheme need not the blender structure moreover. The cylinder cover of the gas engine of the original traditional route is overcome, a large number of special parts need to be designed to adapt to the original diesel engine air inlet channel, mixed gas is improved from air inlet, the part of the whole engine to be transformed is more, special parts need to be designed for a temperature regulator, a mixer, a water pump, a supercharger system and the like, parts of the diesel engine cannot be used generally, and the research and development cost is far higher than that of the precombustion chamber structure route. The gas fuel is directly sprayed into the combustion chamber and is mixed with air in the combustion chamber, the approach is short, the stability is strong, the combustion delay period and the combustion duration can be greatly shortened, the detonation boundary is widened, the detonation pressure circulation fluctuation is reduced, and the combustion stability of the engine can be greatly improved.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (5)

1. A cylinder head of an active pre-combustion direct injection structure gas engine, comprising:
a high-pressure connection pipe inserted into the cylinder head from a side wall of the cylinder head and extending toward an inner center of the cylinder head;
a gas fuel nozzle inserted into the cylinder head from a side wall of the cylinder head, and a nozzle tip of the gas fuel nozzle being exposed from a bottom surface of the cylinder head;
a gas fuel delivery pipe that communicates with the high-pressure connection pipe and the gas fuel nozzle, respectively;
a precombustion chamber, the axis of which is perpendicular to the bottom surface of the cylinder head and is arranged at the lower part of the center of the cylinder head; and
and a spark plug provided at an upper portion of the precombustion chamber with an ignition portion of the spark plug exposed in the precombustion chamber.
2. The cylinder head of an active pre-combustion direct-injection structural gas engine as set forth in claim 1, further comprising a flame injector disposed at a bottom port of the pre-combustion chamber, and an injection port of the flame injector being exposed to the outside of a bottom surface of the cylinder head.
3. The cylinder head of the active pre-combustion direct-injection structural gas engine as claimed in claim 1, further comprising an ignition coil assembly disposed at an upper portion of a center of the cylinder head, a top portion of the ignition coil assembly being exposed to an outside of the top portion of the cylinder head, the ignition coil assembly being electrically connected to the spark plug.
4. The cylinder head of an active pre-combustion direct injection structural gas engine as set forth in claim 1, further comprising a gas path provided in a middle portion at a center of the cylinder head, the gas path communicating between a tip end of the high-pressure connecting pipe and the pre-combustion chamber.
5. The cylinder head of an active pre-combustion direct injection structural gas engine as set forth in claim 1, wherein a position where the high-pressure connecting pipe is inserted into the cylinder block and a position where the gas fuel nozzle is inserted into the cylinder block are located on a side wall on the same side of the cylinder block, and an insertion position of the high-pressure connecting pipe is higher than an insertion position of the gas fuel nozzle.
CN202210794988.8A 2022-07-07 2022-07-07 Cylinder cover of active pre-combustion direct-injection structure gas engine Pending CN115234395A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210794988.8A CN115234395A (en) 2022-07-07 2022-07-07 Cylinder cover of active pre-combustion direct-injection structure gas engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210794988.8A CN115234395A (en) 2022-07-07 2022-07-07 Cylinder cover of active pre-combustion direct-injection structure gas engine

Publications (1)

Publication Number Publication Date
CN115234395A true CN115234395A (en) 2022-10-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210794988.8A Pending CN115234395A (en) 2022-07-07 2022-07-07 Cylinder cover of active pre-combustion direct-injection structure gas engine

Country Status (1)

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