CN114790934B - Ignition device for precombustion chamber of natural gas engine - Google Patents
Ignition device for precombustion chamber of natural gas engine Download PDFInfo
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- CN114790934B CN114790934B CN202210222927.4A CN202210222927A CN114790934B CN 114790934 B CN114790934 B CN 114790934B CN 202210222927 A CN202210222927 A CN 202210222927A CN 114790934 B CN114790934 B CN 114790934B
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- air passage
- mounting hole
- natural gas
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- hole
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 239000003345 natural gas Substances 0.000 title claims abstract description 64
- 238000002485 combustion reaction Methods 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 37
- 238000003860 storage Methods 0.000 claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims description 36
- 238000003825 pressing Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 abstract description 3
- 230000033228 biological regulation Effects 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- 239000002912 waste gas Substances 0.000 abstract description 2
- 230000005764 inhibitory process Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
Classifications
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- 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
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- 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
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- 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
- F02B19/1014—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 design parameters, e.g. volume, torch passage cross sectional area, length, orientation, or the like
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- 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
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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
- Y02T10/12—Improving ICE efficiencies
Landscapes
- 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 relates to a natural gas engine precombustion chamber ignition device, which belongs to the technical field of engines, and is characterized in that a natural gas thermal jet engine structure is modified, natural gas in a high-pressure gas storage tank is independently supplied into a precombustion chamber through a cam and plunger mechanism, so that the concentration of residual waste gas in the precombustion chamber can be effectively reduced, the high-flexibility regulation and control of the concentration of mixed gas are realized, meanwhile, a spark plug is arranged at the side of the device, the mixed gas which is pushed into an engine cylinder under the condition of not being combusted or fully combusted can be reduced, so that the utilization rate of the mixed gas in the precombustion chamber is improved, the combustion state in the precombustion chamber can be effectively improved, the thermal jet ignition capability is improved, the combustion stability of the thermal jet engine is improved, and the power rise, the thermal efficiency improvement and the generation of knocking inhibition are realized.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a natural gas engine precombustion chamber ignition device.
Background
The pre-combustion chamber ignition technology is a technical measure for effectively improving the combustion and emission performance of a natural gas engine. Compared with the conventional spark plug ignition mode, the spark plug can ignite the natural gas mixture in the precombustion chamber in the working process, so that the pressure and the temperature of the gas in the precombustion chamber are quickly increased, and then the high-temperature mixture in the precombustion chamber can be sprayed into the engine cylinder to ignite the gas mixture in the cylinder. The pre-chamber ignition allows the engine cylinder to achieve more ignition points and faster flame propagation speed than the spark plug ignition, thereby improving engine thermal efficiency and reducing harmful pollutant emissions.
For the existing common natural gas precombustion chamber ignition device, the combustible mixture in the precombustion chamber mainly comes from the mixed gas pressed in by an engine cylinder, the concentration of the mixed gas in the precombustion chamber cannot be independently regulated and controlled, and then when the natural gas engine adopts a dilution combustion mode, the concentration of the combustible mixed gas in the precombustion chamber is also lower, so that the heat release amount of the mixed gas in the precombustion chamber can be obviously reduced, the actual improvement effect on the performance of the natural gas engine in dilution combustion is extremely limited, and even deterioration can be caused. The independent fuel supply system is arranged in the precombustion chamber to realize high-flexibility adjustment of the concentration of the mixed gas in the precombustion chamber, which is an effective technical scheme for solving the problem, but the current independent fuel supply system is mostly realized by additionally arranging an electromagnetic control type injector, so that the production and manufacturing cost is obviously increased, and the arrangement and installation are difficult; in particular, it is affected by problems such as heat dissipation and abrasion, and there is also a problem of use reliability.
In addition, most of spark plugs of the prior art ignition devices are arranged at the top of the precombustion chamber, and when the spark plugs work, combustible mixed gas at the top of the precombustion chamber is ignited first, so that a large amount of mixed gas at the head of the precombustion chamber is pushed into an engine cylinder under the condition of not being combusted or fully combusted under the actions of temperature rise and pressure rise of the mixed gas at the top, and the utilization rate of the combustible mixed gas in the precombustion chamber is poor.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the high-integration low-cost pre-combustion chamber ignition device which can realize independent supply of natural gas in the pre-combustion chamber, high-flexibility regulation and control of the concentration of mixed gas and increase of the utilization rate of the mixed gas in the pre-combustion chamber.
The invention relates to a natural gas engine precombustion chamber ignition device which comprises a cylinder cover A, a precombustion chamber lower body B, an air nozzle C, a precombustion chamber upper body component D, a control plunger component E, a natural gas high-pressure supply system F, a pressing plate G, a cam 1, a cam shaft 2, a bolt group 3 and a spark plug 4, wherein a through hole a5, a through hole B7, a threaded mounting hole 8 and an air inlet channel 6 are arranged on the cylinder cover A; the lower body B of the precombustion chamber is provided with a jet hole 9, a combustion chamber 10 and a spark plug mounting hole 11; the precombustor upper body assembly D consists of a precombustor upper body D1, a plug a14, a spring a15, a plug b16, a sealing ring a17, a sealing ring b18, a plug c19, a plug D20, a plug e21 and a rolling ball 22, wherein a connecting ring table a23, a connecting ring table b24, a ball mounting hole 25, an air passage b26, an air passage c27, an air passage D28, a plunger mounting hole a29, an air passage e30, an air passage f31, a plug mounting hole 32, an air passage g33, an air passage h34 and an air passage i35 are arranged on the precombustor upper body D1; the control plunger assembly E consists of a control plunger E1, a spring 36 and a ring block 37; the natural gas high-pressure supply system F consists of an electric control pressure regulating valve 41, a natural gas pressure reducing valve 42, a high-pressure gas storage tank 43, a one-way valve 44 and a pressure regulating valve 45, wherein the right end of the natural gas pressure reducing valve 42 is connected with the high-pressure gas storage tank 43, the left end of the natural gas pressure reducing valve 42 is communicated with the gas inlet channel 6 of the cylinder cover A, and the lower end of the natural gas pressure reducing valve 42 is communicated with the electric control pressure regulating valve 41; the electric control pressure regulating valve 41 is communicated with an air passage m46 of the pressure plate G; one end of the check valve 44 is communicated with the air inlet channel 6 of the cylinder cover A, one end of the check valve is communicated with the pressure regulating valve 45 of the cylinder cover A, and the lower end of the pressure regulating valve 45 is communicated with the air channel n48 of the pressure plate G; the pressing plate G is provided with an air passage m46, a plunger mounting hole b47 and an air passage n48; the air passage m46 is communicated with the air passage D28 of the upper precombustor body D1; airway n48 communicates with airway e30 of prechamber upper body D1; the plunger mounting hole b47 is communicated with the plunger mounting hole a29 of the upper body D1 of the precombustor, and the apertures are consistent; the lower body B of the precombustion chamber is arranged in a through hole a5 of the cylinder cover A, is fixedly connected with a connecting ring table a23 of the upper body D1 of the precombustion chamber, the lower end of the lower body B of the precombustion chamber extends into an engine cylinder, and the combustion chamber 10 is communicated with the engine cylinder through a jet hole 9; the air nozzle C is fixedly connected to the connecting ring table b24 of the upper body D1 of the precombustion chamber; the precombustor upper body component is arranged in a through hole b7 of the cylinder cover A; the control plunger assembly E is arranged in a plunger mounting hole a29 and a plunger mounting hole b47 of the upper pre-combustion chamber body D1 and the pressing plate G, and the control plunger E1 is in clearance fit with the plunger mounting hole a29 and the plunger mounting hole b 47; the pressing plate G is fixedly connected to the cylinder cover A through a bolt group 3 and is connected with the top end of the upper body D1 of the precombustor; the cam 2 is fixedly connected to the cam shaft 1, is arranged above the ring block 37 and is in sliding connection with the ring block 37; the electric control pressure regulating valve 41 of the natural gas high-pressure supply system F is connected with the air passage m46, the pressure regulating valve 45 is connected with the air passage n48, and the natural gas pressure reducing valve 42 and the one-way valve 44 are connected with the cylinder cover A air inlet passage 6; the left part of the spark plug 4 is in threaded connection with a threaded hole 8 of the cylinder cover A and a spark plug mounting hole 11 of the precombustor lower body B.
The through hole a5 and the through hole b7 of the cylinder cover A are communicated up and down; the diameter of the through hole a5 is smaller than that of the through hole b7; the screw mounting hole 8 communicates with the through hole a5 in the left-right direction.
The spark plug mounting hole 11 of the lower body B of the precombustion chamber is communicated with the combustion chamber 10, and the jet hole 9 is communicated with the combustion chamber 10.
The air nozzle C is provided with an air jet hole 12 and an air passage a13, and the air jet hole 12 is communicated with the air passage a13 and is used for independently supplying natural gas to the combustion chamber 29.
The upper prechamber body D1 of the upper prechamber body assembly D is provided with a connecting ring table a23, a connecting ring table b24, a ball mounting hole 25, an air passage b26, an air passage c27, an air passage D28, a plunger mounting hole a29, an air passage e30, an air passage f31, a plug mounting hole 32, an air passage g33, an air passage h34 and an air passage i35, and the ball mounting hole 25, the air passage b26, the air passage c27, the air passage D28, a plunger mounting hole a29, an air passage e30, an air passage f31, an air passage g33, an air passage h34 and an air passage i35 of the upper prechamber body assembly D are communicated; the aperture of the ball mounting hole 25 is larger than the aperture of the air passage b26 for restricting the ball position; the spring a15 and the rolling ball 22 are arranged in the ball mounting hole 25, one end of the rolling ball 22 is connected with the spring a15, and the other end is connected with the air passage b 26; one end of the spring a15 is connected with the rolling ball 22, and the other end is connected with the plug a 14; the plug b16 is fixedly connected to the outer side of the air passage c 27; the sealing ring a17 is arranged outside the air passage d 28; the sealing ring b18 is arranged outside the air passage d 28; the plug c19 is fixedly connected to the outer side of the air passage f 31; the plug d20 is fixedly connected in the plug mounting hole 32; the plug e21 is fixedly connected to the outer side of the air passage g 33.
The control plunger E1 of the control plunger assembly E is provided with an air passage j38, an air guide ring table 39 and an air passage l40, and the air guide ring table 39, the air passage l40 and the air passage j38 are communicated; the ring block 37 is fixedly connected to the control plunger E1; the upper end of the spring b36 is connected with the ring block 37, and the lower end is connected with the pressing plate G.
The working process of the invention is as follows:
when an intake valve of the engine is opened, a cam 1 rotates along with a cam shaft 2, a cam 1 drives a ring block 37 to move downwards, an air passage c27 is communicated with an air guide ring table 39, natural gas in a high-pressure air storage tank 43 is decompressed by a natural gas decompression valve 42 and an electric control pressure regulating valve 41 and sequentially passes through an air passage m46, an air passage d28, an air passage c27, the air guide ring table 39, an air passage l40, an air passage j38, a plunger mounting hole a29, an air passage g33, an air passage h34 and an air passage b26 to enter a ball mounting hole 25, the high-pressure natural gas pushes a ball 22 to move leftwards, the ball mounting hole 25 is communicated with an air passage i35, and then the high-pressure natural gas sequentially passes through the air passage i35, an air passage a13 and an air injection hole 12 to enter a combustion chamber 10; after a period of time, the ECU controls the camshaft 2 to drive the cam 1 to rotate, under the drive of the spring b36, the ring block 37 drives the control plunger E1 to move upwards, the air channel l40 is communicated with the air channel f31, meanwhile, the air channel c27 is disconnected with the air guide ring table 39, natural gas stops being supplied, high-pressure natural gas remained in the ball mounting hole 25, the air channel b26, the air channel g33, the air channel h34, the plunger mounting hole a29 and the air channel j38 flows into the engine air inlet 6 after passing through the air channel l40, the air channel f31, the air channel E30, the air channel n48, the pressure regulating valve 45 and the one-way valve 44, the natural gas pressure in the ball mounting hole 25 is reduced, the spring a15 drives the ball 22 to move rightwards, the communication between the air channel b26 and the air channel i35 is cut off, the combustion chamber 10 is continuously pressed into air to form mixed gas along with the piston ascending, when the engine needs ignition, the spark plug 4 is ignited, the mixed gas in the combustion chamber 10 is ignited, and the high-temperature gas in the combustion chamber 10 is sprayed out through the plurality of jet holes 9 in a thermal jet mode.
The spark plug 4 is arranged at the side of the combustion chamber 10, so that a flame core is generated in the middle of the combustion chamber, flame simultaneously develops towards the upper part and the lower part of the combustion chamber, unburned matters sprayed out by the jet hole 9 can be reduced, the combustion intensity in the combustion chamber 9 is further improved, and the intensity of thermal jet flow is effectively improved.
The pressure regulating valve 45 is for reducing the rate of the natural gas pressure in the air passage, preventing the impact load of the ball 22 from being excessive, resulting in the reduction of the service life of the mechanism, and the check valve 44 is for preventing the gas in the engine air intake 6 from flowing back into the air passage of the mechanism.
The invention can optimize the formation process of the combustible mixed gas of the jet ignition device of the natural gas precombustion chamber, realize scavenging in the precombustion chamber, effectively reduce the residual waste gas amount in the precombustion chamber, improve the combustion efficiency in the precombustion chamber, effectively improve the strength of the natural gas hot jet, further improve the combustion stability of the natural gas hot jet engine and effectively inhibit knocking.
Drawings
FIG. 1 is a schematic diagram of a natural gas engine prechamber ignition device;
fig. 2 is a schematic structural view of a cylinder head a;
FIG. 3 is a schematic view of the structure of the lower body B of the precombustor;
fig. 4 is a schematic structural view of the air nozzle C;
FIG. 5 is a schematic view of the upper prechamber body assembly D;
FIG. 6 is a schematic structural view of the upper prechamber body D1;
FIG. 7 is a schematic structural view of the control plunger assembly E;
fig. 8 is a schematic structural view of the control plunger E1;
fig. 9 is a schematic structural view of a natural gas high pressure feed system F;
fig. 10 is a schematic structural view of the platen G;
wherein: A. cylinder cover B, precombustor lower body C, air nozzle D, precombustor upper body component E, control plunger component F, natural gas high-pressure supply system G, pressing plate 1, cam; 2. a cam shaft; 3. a bolt group; 4. a spark plug; 5. a through hole a;6. an air inlet channel; 7. a through hole b;8. a threaded hole; 9. jet holes; 10. a combustion chamber; 11. a spark plug mounting hole; 12. a gas injection hole; 13. an airway a;14. a plug a;15. a spring a;16. a plug b;17. a sealing ring a;18. a sealing ring b;19. a plug c;20. a plug d;21. a plug e;22. a rolling ball; 23. a connecting ring table a;24. a connecting ring table b;25. a ball mounting hole; 26. an airway b;27. an airway c;28. an airway d;29. a plunger mounting hole a;30. an airway e;31. an airway f;32. a plug mounting hole; 33. airway g;34. an airway h;35. airway i;36. a spring b;37. a ring block; 38. an airway j;39. a gas guide ring table; 40. an airway l;41. an electric control pressure regulating valve; 42. a natural gas pressure reducing valve; 43. a high pressure gas storage tank; 44. a one-way valve; 45. a pressure regulating valve; 46. an airway m;47. a plunger mounting hole b;48. airway n.
Detailed Description
As shown in fig. 1, the ignition device of the precombustion chamber of the natural gas engine consists of a cylinder cover A, a precombustion chamber lower body B, an air nozzle C, a precombustion chamber upper body component D, a control plunger component E, a natural gas high-pressure supply system F, a pressing plate G, a cam 1, a cam shaft 2, a bolt group 3 and a spark plug 4, wherein a through hole a5, a through hole B7, a threaded mounting hole 8 and an air inlet channel 6 are formed in the cylinder cover A; the lower body B of the precombustion chamber is provided with a jet hole 9, a combustion chamber 10 and a spark plug mounting hole 11; the precombustor upper body assembly D consists of a precombustor upper body D1, a plug a14, a spring a15, a plug b16, a sealing ring a17, a sealing ring b18, a plug c19, a plug D20, a plug e21 and a rolling ball 22, wherein a connecting ring table a23, a connecting ring table b24, a ball mounting hole 25, an air passage b26, an air passage c27, an air passage D28, a plunger mounting hole a29, an air passage e30, an air passage f31, a plug mounting hole 32, an air passage g33, an air passage h34 and an air passage i35 are arranged on the precombustor upper body D1; the control plunger assembly E consists of a control plunger E1, a spring 36 and a ring block 37; the natural gas high-pressure supply system F consists of an electric control pressure regulating valve 41, a natural gas pressure reducing valve 42, a high-pressure gas storage tank 43, a one-way valve 44 and a pressure regulating valve 45, wherein the right end of the natural gas pressure reducing valve 42 is connected with the high-pressure gas storage tank 43, the left end of the natural gas pressure reducing valve 42 is communicated with the gas inlet channel 6 of the cylinder cover A, and the lower end of the natural gas pressure reducing valve 42 is communicated with the electric control pressure regulating valve 41; the electric control pressure regulating valve 41 is communicated with an air passage m46 of the pressure plate G; one end of the check valve 44 is communicated with the air inlet channel 6 of the cylinder cover A, one end of the check valve is communicated with the pressure regulating valve 45 of the cylinder cover A, and the lower end of the pressure regulating valve 45 is communicated with the air channel n48 of the pressure plate G; the pressing plate G is provided with an air passage m46, a plunger mounting hole b47 and an air passage n48; the air passage m46 is communicated with the air passage D28 of the upper precombustor body D1; airway n48 communicates with airway e30 of prechamber upper body D1; the plunger mounting hole b47 is communicated with the plunger mounting hole a29 of the upper body D1 of the precombustor, and the apertures are consistent; the lower body B of the precombustion chamber is arranged in a through hole a5 of the cylinder cover A, is fixedly connected with a connecting ring table a23 of the upper body D1 of the precombustion chamber, the lower end of the lower body B of the precombustion chamber extends into an engine cylinder, and the combustion chamber 10 is communicated with the engine cylinder through a jet hole 9; the air nozzle C is fixedly connected to the connecting ring table b24 of the upper body D1 of the precombustion chamber; the precombustor upper body component is arranged in a through hole b7 of the cylinder cover A; the control plunger assembly E is arranged in a plunger mounting hole a29 and a plunger mounting hole b47 of the upper pre-combustion chamber body D1 and the pressing plate G, and the control plunger E1 is in clearance fit with the plunger mounting hole a29 and the plunger mounting hole b 47; the pressing plate G is fixedly connected to the cylinder cover A through a bolt group 3 and is connected with the top end of the upper body D1 of the precombustor; the cam 2 is fixedly connected to the cam shaft 1, is arranged above the ring block 37 and is in sliding connection with the ring block 37; the electric control pressure regulating valve 41 of the natural gas high-pressure supply system F is connected with the air passage m46, the pressure regulating valve 45 is connected with the air passage n48, and the natural gas pressure reducing valve 42 and the one-way valve 44 are connected with the cylinder cover A air inlet passage 6; the left part of the spark plug 4 is in threaded connection with a threaded hole 8 of the cylinder cover A and a spark plug mounting hole 11 of the precombustor lower body B.
As shown in fig. 2, the through hole a5 of the cylinder cover a is communicated with the through hole b7 from top to bottom; the diameter of the through hole a5 is smaller than that of the through hole b7; the screw mounting hole 8 communicates with the through hole a5 in the left-right direction.
As shown in fig. 3, the lower body B of the precombustion chamber is provided with a jet hole 9, a combustion chamber 10 and a spark plug mounting hole 11, and the spark plug mounting hole 11 is communicated with the combustion chamber 10; the jet hole 9 is communicated with the combustion chamber 10; the lower end of the lower body B of the precombustion chamber extends into the engine cylinder, and the combustion chamber 10 is communicated with the engine cylinder through the jet hole 9.
As shown in fig. 4, the air nozzle C is provided with an air jet hole 12 and an air passage a13; the gas injection holes 12 communicate with the gas passages a13 for independently supplying natural gas to the combustion chambers 29.
As shown in fig. 5 to 6, the upper prechamber body assembly D is composed of an upper prechamber body D1, a plug a14, a spring a15, a plug b16, a sealing ring a17, a sealing ring b18, a plug c19, a plug D20, a plug e21 and a ball 22, wherein a connecting ring table a23, a connecting ring table b24, a ball mounting hole 25, an air passage b26, an air passage c27, an air passage D28, a plunger mounting hole a29, an air passage e30, an air passage f31, a plug mounting hole 32, an air passage g33, an air passage h34 and an air passage i35 are arranged on the upper prechamber body D1, and the ball mounting hole 25, the air passage b26, the air passage c27, the air passage D28, the plunger mounting hole a29, the air passage e30, the air passage f31, the air passage g33, the air passage h34 and the air passage i35 of the upper prechamber body D1 are communicated; the aperture of the ball mounting hole 25 is larger than the aperture of the air passage b26 for restricting the ball position; the spring a15 and the rolling ball 22 are arranged in the ball mounting hole 25, one end of the rolling ball 22 is connected with the spring a15, and the other end is connected with the air passage b 26; one end of the spring a15 is connected with the rolling ball 22, and the other end is connected with the plug a 14; the plug b16 is fixedly connected to the outer side of the air passage c 27; the sealing ring a17 is arranged outside the air passage d 28; the sealing ring b18 is arranged in the air passage d 28; the plug c19 is fixedly connected to the outer side of the air passage f 31; the plug d20 is fixedly connected to the outer side of the plug mounting hole 32; the plug e21 is fixedly connected to the outer side of the air passage g 33.
As shown in fig. 7 to 8, the control plunger assembly E is composed of a control plunger E1, a spring 36 and a ring block 37, wherein the control plunger E1 is provided with an air passage j38, an air guide ring table 39 and an air passage l40, and the air guide ring table 39, the air passage l40 and the air passage j38 are communicated; the ring block 37 is fixedly connected to the control plunger E1; the upper end of the spring b36 is connected with the ring block 37, and the lower end is connected with the pressing plate G.
As shown in fig. 9, the natural gas high-pressure supply system F is composed of an electric control pressure regulating valve 41, a natural gas pressure reducing valve 42, a high-pressure gas storage tank 43, a one-way valve 44 and a pressure regulating valve 45, wherein the right end of the natural gas pressure reducing valve 42 is connected with the high-pressure gas storage tank 43, the left end is communicated with the cylinder cover a air inlet channel 6, and the lower end is communicated with the electric control pressure regulating valve 41; the electric control pressure regulating valve 41 is communicated with an air passage m46 of the pressure plate G; one end of the check valve 44 is communicated with the cylinder cover A air inlet channel 6, and the other end is communicated with the cylinder cover A pressure regulating valve 45; the lower end of the pressure regulating valve 45 is communicated with an air passage n48 of the pressure plate G.
As shown in fig. 10, the pressure plate G is provided with an air passage m46, a plunger mounting hole b47 and an air passage n48; the air passage m46 is communicated with the air passage D28 of the upper precombustor body D1; airway n48 communicates with airway e30 of prechamber upper body D1; the plunger mounting hole b47 communicates with the plunger mounting hole a29 of the prechamber upper body D1, and has a uniform aperture.
Claims (6)
1. A natural gas engine prechamber ignition device, characterized in that: the device consists of a cylinder cover (A), a precombustor lower body (B), an air nozzle (C), a precombustor upper body component (D), a control plunger component (E), a natural gas high-pressure supply system (F), a pressing plate (G), a cam (1), a cam shaft (2), a bolt group (3) and a spark plug (4), wherein a through hole a (5), a through hole B (7), a threaded mounting hole (8) and an air inlet channel (6) are formed in the cylinder cover (A); the pre-combustion chamber lower body (B) is provided with a jet hole (9), a combustion chamber (10) and a spark plug mounting hole (11); the precombustion chamber upper body assembly (D) consists of a precombustion chamber upper body (D1), a plug a (14), a spring a (15), a plug b (16), a sealing ring a (17), a sealing ring b (18), a plug c (19), a plug D (20), a plug e (21) and a rolling ball (22), wherein a connecting ring table a (23), a connecting ring table b (24), a ball mounting hole (25), an air passage b (26), an air passage c (27), an air passage D (28), a plunger mounting hole a (29), an air passage e (30), an air passage f (31), a plug mounting hole (32), an air passage g (33), an air passage h (34) and an air passage i (35) are arranged on the precombustion chamber upper body (D1); the control plunger assembly (E) consists of a control plunger (E1), a spring (36) and a ring block (37); the natural gas high-pressure supply system (F) consists of an electric control pressure regulating valve (41), a natural gas pressure reducing valve (42), a high-pressure gas storage tank (43), a one-way valve (44) and a pressure regulating valve (45), wherein the right end of the natural gas pressure reducing valve (42) is connected with the high-pressure gas storage tank (43), the left end of the natural gas pressure reducing valve (42) is communicated with an air inlet channel (6) of a cylinder cover (A), and the lower end of the natural gas pressure reducing valve (42) is communicated with the electric control pressure regulating valve (41); the electric control pressure regulating valve (41) is communicated with an air passage m (46) of the pressure plate (G); one end of the one-way valve (44) is communicated with the air inlet channel (6) of the cylinder cover (A), the other end of the one-way valve is communicated with the pressure regulating valve (45) of the cylinder cover (A), and the lower end of the pressure regulating valve (45) is communicated with the air channel n (48) of the pressure plate (G); the pressing plate (G) is provided with an air passage m (46), a plunger mounting hole b (47) and an air passage n (48); the air passage m (46) is communicated with the air passage D (28) of the upper body (D1) of the precombustor; the air passage n (48) is communicated with the air passage e (30) of the upper body (D1) of the precombustor; the plunger mounting hole b (47) is communicated with the plunger mounting hole a (29) of the upper body (D1) of the precombustor, and the apertures are consistent; the lower body (B) of the precombustion chamber is arranged in a through hole a (5) of the cylinder cover (A) and fixedly connected with a connecting ring table a (23) of the upper body (D1) of the precombustion chamber, the lower end of the lower body (B) of the precombustion chamber stretches into an engine cylinder, and the combustion chamber (10) is communicated with the engine cylinder through a jet hole (9); the air nozzle (C) is fixedly connected to a connecting ring table b (24) of the upper body (D1) of the precombustor; the precombustor upper body component (D) is arranged in a through hole b (7) of the cylinder cover (A); the control plunger assembly (E) is arranged in a plunger mounting hole a (29) and a plunger mounting hole b (47) of the upper body (D1) of the precombustion chamber and the pressing plate (G), and the control plunger (E1) is in clearance fit with the plunger mounting hole a (29) and the plunger mounting hole b (47); the pressing plate (G) is fixedly connected to the cylinder cover (A) through a bolt group (3) and is connected with the top end of the upper body (D1) of the precombustion chamber; the cam (2) is fixedly connected to the cam shaft (1), is arranged above the ring block (37) and is in sliding connection with the ring block (37); an electric control pressure regulating valve (41) of a natural gas high-pressure supply system (F) is connected with an air passage m (46), a pressure regulating valve (45) is connected with an air passage n (48), and a natural gas pressure reducing valve (42) and a one-way valve (44) are connected with an air inlet passage (6) of a cylinder cover (A); the left part of the spark plug (4) is in threaded connection with a threaded hole (8) of the cylinder cover (A) and a spark plug mounting hole (11) of the precombustion chamber lower body (B).
2. The natural gas engine prechamber ignition device as set forth in claim 1, wherein: the through hole a (5) of the cylinder cover (A) is communicated with the through hole b (7) up and down; the diameter of the through hole a (5) is smaller than that of the through hole b (7); the screw thread mounting hole (8) is communicated with the through hole a (5) in the left-right direction.
3. The natural gas engine prechamber ignition device as set forth in claim 1, wherein: the spark plug mounting hole (11) of the pre-combustion chamber lower body (B) is communicated with the combustion chamber (10), and the jet hole (9) is communicated with the combustion chamber (10).
4. The natural gas engine prechamber ignition device as set forth in claim 1, wherein: the air nozzle (C) is provided with an air jet hole (12) and an air passage a (13), and the air jet hole (12) is communicated with the air passage a (13).
5. The natural gas engine prechamber ignition device as set forth in claim 1, wherein: the pre-combustion chamber upper body (D1) of the pre-combustion chamber upper body assembly (D) is provided with a connecting ring table a (23), a connecting ring table b (24), a ball mounting hole (25), an air passage b (26), an air passage c (27), an air passage D (28), a plunger mounting hole a (29), an air passage e (30), an air passage f (31), a plug mounting hole (32), an air passage g (33), an air passage h (34) and an air passage i (35), wherein the ball mounting hole (25), the air passage b (26), the air passage c (27), the air passage D (28), the plunger mounting hole a (29), the air passage e (30), the air passage f (31), the air passage g (33), the air passage h (34) and the air passage i (35) are communicated; the aperture of the ball mounting hole (25) is larger than the aperture of the air passage b (26); the spring a (15) and the rolling ball (22) are arranged in the ball mounting hole (25), one end of the rolling ball (22) is connected with the spring a (15), and the other end is connected with the air passage b (26); one end of the spring a (15) is connected with the rolling ball (22), and the other end is connected with the plug a (14); the plug b (16) is fixedly connected to the outer side of the air passage c (27); the sealing ring a (17) is arranged outside the air passage d (28); the sealing ring b (18) is arranged outside the air passage d (28); the plug c (19) is fixedly connected to the outer side of the air passage f (31); the plug d (20) is fixedly connected in the plug mounting hole (32); the plug e (21) is fixedly connected to the outer side of the air passage g (33).
6. The natural gas engine prechamber ignition device as set forth in claim 1, wherein: an air passage j (38), an air guide ring table (39), an air passage l (40) and the air guide ring table (39), the air passage l (40) and the air passage j (38) are arranged on a control plunger (E1) of the control plunger assembly (E); the ring block (37) is fixedly connected to the control plunger (E1); the upper end of the spring b (36) is connected with the ring block (37), and the lower end is connected with the pressing plate (G).
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